UL Listing

Features

  • Large Display NEMA 4X, IP65 Wall Mounted Meter
  • (1) High Voltage and (1) High Current Input
  • Multiplication for Apparent Power Calculation
  • 0-300 VAC or VDC Voltage Input
  • 0-5 AAC or ADC Current Input
  • Large Dual-Line 6-Digit Display, 1.8" (46 mm) Digits Readable up to 100 Feet (30 Meters) Away
  • Four (4) Relays with Interlocking Capability + Isolated 4-20 mA Output Option
  • Free PC-Based MeterView Pro USB Programming Software
  • Super Bright Display
  • Operating Temperature Range: -40 to 65°C (-40 to 150°F)
  • UL & C-UL Listed. E160849; 508 Industrial Control Equipment
  • Input Power Options Include 85-265 VAC or 12-24 VDC
  • Programmable Display, Function Keys & Digital Inputs
  • Onboard RS-485 Serial Communications
  • Modbus RTU Communication Protocol Standard
  • Split Core AC Current Transformers Up to 1000 A AC Available
  • Control Station Accessory Available For Remote Operation of Helios

Overview

Front

Front of PD2-6400

Connections

PD2-6400 Connections

The Only Large Display High Voltage & Current Meter You Will Ever Need

The Helios large display high voltage and current meter boasts specifications, features and functionality that make it the only large display high voltage and current meter you will ever need. The big, bright 6-digit dual-line LED display that can be seen from 100 feet even in bright sunlight is the first thing you will notice about the Helios. The dual-line display can be used to display voltage in the range of 0-300 VAC or VDC on one line and 0-5 AAC or ADC on the other line. In addition, a math channel P calculates apparent power as the product of the voltage and current inputs.

The enclosure is rated NEMA 4X which means you can install the Helios indoors and outdoors, exposed to moisture, dust and other adverse conditions. Other key features include four relays and 4-20 mA output option, function keys, and Modbus RTU serial communications. Finally, all these features and capabilities can easily be programmed with free MeterView Pro PC-based software.

Precision Digital also offers several accessories for the Helios to enhance the user experience:

  • AC current transformers that can step down a higher current to 0-5 AAC that can be read directly by the PD2-6400
  • Control Stations for remote programming and other functions

Advanced Display Features

Dual-Line Makes All the Difference

The upper display can be programmed to indicate PV, maximum (peak), minimum (valley), alternating maximum/ minimum, one of eight alarm set points, or Modbus input. The lower display can be configured to display engineering units, set points, user defined messages, or simply turned off.

The Helios’s dual-line display makes all the difference both when programming the instrument and when using it in the field. When programming the instrument, the dual line display prompts for the needed information and also helps you keep track of where you are in the setup process. When using the instrument, the dual line display provides more information such as displaying the input in two different scales like height and volume for a level application. We call this the Dual-Scale feature.

Programming Assistance

The Helios’s dual-line display makes programming the instrument much easier because the lower line prompts for the needed information and also helps you keep track of where you are in the setup process.

The Helios is prompting for the value for Input 2 and displaying the default value of 5.00 A.

The Helios is prompting for the value for Input 2 and displaying the default value of 5.00 A. The “5” in 5.00 is brighter than the rest of the digits indicating that it is the number that will be changed by the Up and Right arrows.

The Helios is now prompting for what the user wants Display 2 to be

The Helios is now prompting for what the user wants Display 2 to be; that is the value that corresponds to 95.00 A. In this case Display 2 is currently set to 95.00.

Superluminous Sunlight Readable Display

The Helios's standard SunBright display features extraordinarily bright LEDs. It is perfect for applications where the meter is in direct sunlight or in applications where visibility may be impaired by smoke, fog, dust, or distance.

Rounding Feature for Even Steadier Display

The rounding feature is used to give the user a steadier display with fluctuating signals. It causes the display to round to the nearest value according to the rounding value selected (1, 2, 5, 10, 20, 50, or 100). For example, with a rounding value of 10, and an input of 12346, the display would indicate 12350.

Display Voltage and Current Individually or at Same Time

The Helios PD2-6400 can accept both a voltage and a current input. These can be displayed as one or the other as illustrated in the first set of screen shots below or both at the same time as illustrated by the second set of screen shots.

Display Voltage and Current Individually or at Same Time

MeterView Pro can be used to scale the voltage and the current inputs on the Helios PD2-6400 meter.

MeterView Pro

Toggling Between Reading & Units with Tag and Calculating Apparent Power

The Helios below is programmed so the upper line toggles between the reading and units, and the lower line displays a tag. A math channel P calculates apparent power as the product of the voltage and current inputs shown in the bottom two images.

Toggling Between Reading & Units with Tag and Calculating Apparent Power

Except where noted all specifications apply to operation at +25°C.

General

Display: Two lines with 1.8" (46 mm) high digits, red LEDs; 6 digits per line (-99999 to 999999), with lead zero blanking
Display Intensity: Eight user-selectable intensity levels
Display Update Rate: 5/second (200 ms)
Overrange: Display flashes 999999
Underrange: Display flashes -99999
Display Assignment: Displays lines 1 & 2 may be assigned to process values for Channels A (Ch-A, current), V (Ch-V, voltage), or P (Ch-P, apparent power); toggle between (Ch-A & Ch-V, Ch-A & Ch-P, Ch-V & Ch-P, and Ch-A, Ch-V, & Ch-P); relay set points; max and/or min values for CH-A, Ch-V, or Ch-P; CH-A and units; Ch-V and units; Ch-P and units; or Modbus input. The lower display may also be set to show engineering units or be off, with no display.
Noise filter: Programmable from 2 to 199 (0 will disable filter)
Filter Bypass: Programmable from 0.1 to 99.9% of calibrated span
Recalibration: All ranges are calibrated at the factory. Recalibration is recommended at least every 12 months.
Max/Min Display: Max/min readings reached by the process are stored until reset by the user or until power to the meter is turned off.
Password: Three programmable passwords restrict modification of programmed settings.
Pass 1: Allows use of function keys and digital inputs
Pass 2: Allows use of function keys, digital inputs and editing set/ reset points
Pass 3: Restricts all programming, function keys, and digital inputs
Non-Volatile Memory: All programmed settings are stored in non- volatile memory for a minimum of ten years if power is lost.
Power Options: 85-265 VAC 50/60 Hz, 90-265 VDC, 20 W max or 12-24 VDC ± 10%, 15 W max. Powered over USB for configuration only.
Fuse: Required external fuse: UL Recognized, 5 A max, slow blow; up to 6 meters may share one 5 A fuse.
Normal Mode Rejection: Greater than 60 dB at 50/60 Hz
Isolation: 500 V AC/DC potential allowed between voltage and current input channels. Channels isolated by 3 MΩ impedance 4 kV input/output-to-power line 500 V input-to-output or output- to-P+ supply.
Overvoltage Category: Installation Overvoltage Category II: Local level with smaller transient overvoltages than Installation Overvoltage Category III.
Environmental:
Operating temperature range: -40 to 150°F (-40 to 65°C) Storage temperature range: -40 to 185°F (-40 to 85°C)
Relative humidity: 0 to 90% non-condensing
Connections: Removable and integrated screw terminal blocks accept 12 to 22 AWG wire.
Enclosure: UL Type 4X, IP65 rated. Polycarbonate & glass blended plastic case, color: gray. Includes four PG11 through-hole conduit openings, with two factory installed PG11, IP68, black nylon threaded hole plugs with backing nuts.
Wall Mounting: Four (4) mounting holes provided for mounting meter to wall.
Pipe Mounting: Optional pipe mounting kit (PDA6260) allows for pipe mounting. Sold separately. See manual for mounting instructions.
Tightening Torque: Removable Screw Terminals: 5 lb-in (0.56 Nm)
Digital I/O and RS485 Terminals: 2.2 lb-in (0.25 Nm)
Overall Dimensions: 10.63" x 12.59" x 4.77"
(270 mm x 319.7 mm x 121.2 mm) (W x H x D)
Weight: 6.10 lbs (2.76 kg)
UL File Number: UL & C-UL Listed. E160849; 508 Industrial Control Equipment.
Warranty: 3 years parts & labor

USB Connection:

Compatibility: USB 2.0 Standard, Compliant
Connector Type: Micro-B receptacle
Cable: USB A Male to Micro-B Cable
Driver: Microsoft® Windows® XP/Vista/7/8/10
Power: USB Port

Voltage and Current Inputs

High Voltage Input: One high voltage input (Channel V) 0-300 VDC or VAC; Switch Selectable, Modbus PV (Slave)
High Current Input: One high current input (Channel A)
0-5 AAC or ADC; Switch Selectable, Modbus PV (Slave)
Channels: Channel A, Channel V, Channel P (Math Channel for Apparent Power)
AC/DC Selection: Switch selectable for AC or DC inputs. Channels A and V share AC/DC selection.
Apparent Power Math: Apparent power P calculated as P = A * V
Programmable Constants: Constant C (Adder): -99.999 to 999.999, default: 0.000. Constant F (Factor): 0.001 to 999.999, default: 1.000.
Accuracy: ADC: 0.03% Full Scale ±1 count,
AAC: 0.1% Full Scale ±1 count,
VDC: 0.05% Full Scale ±1 count,
VAC: 0.15% Full Scale ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span
Temperature Drift: 0.005% of calibrated span/°C max from -40 to 65°C ambient
Signal Input Conditioning: Linear, square root, programmable exponent, or round horizontal tank volume calculation.
Multi-Point Linearization: 2 to 32 points for Channel A and V
Low-Flow Cutoff: 0-999999 (0 disables cutoff function). Independent for Channel A and V.
Decimal Point: Up to five decimal places or none: d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd
Calibration Range:

Input ChannelInput RangeMinimum Span Input 1 & Input 2/td>
A+/- 0-5 ADC/0-5 AAC+/- 0.005 ADC/0.010 AAC
V+/- 0-300 VDC/0-300 VAC+/- 0.1 VDC/0.3
Note: An error message will appear if the input 1 and input 2 signals are too close together.
Input Impedance: Voltage Input: greater than 3 MΩ.
Current Input: 0.01 Ω.
Input Overload: Voltage input protected up to 500 VDC
Current input protected up to 10 A by a 10A/300V fast acting non- resettable fuse. Fuse is NOT resettable after a fault; unit must be factory reconditioned.
F4 Digital Input Contacts: 3.3 VDC on contact. Connect normally open contacts across F4 to COM.
F4 Digital Input Logic Levels: Logic High: 3 to 5 VDC
Logic Low: 0 to 1.25 VDC

Relays

Rating: 2 or 4 SPDT (Form C) internal and/or 4 SPST (Form A) external; rated 3 A @ 30 VDC and 125/250 VAC resistive load; 1/14 HP (≈ 50 W) @ 125/250 VAC for inductive loads
Noise Suppression: Noise suppression is recommended for each relay contact switching inductive loads.
Deadband: 0-100% of span, user programmable
High or Low Alarm: User may program any alarm for high or low trip point. Unused alarm LEDs and relays may be disabled (turn off).
Relay Operation: Automatic (non-latching) and/or manual reset Latching (requires manual acknowledge) with/without clear
Pump alternation control (2 to 4 relays)
Sampling (based on time)
Off (disable unused relays and enable Interlock feature)
Manual on/off control mode
Relay Reset: Digital inputs, or PC.
1. Automatic reset only (non-latching), when input passes the reset point.
2. Automatic + manual reset at any time (non-latching).
3. Manual reset only, at any time (latching).

RS485 Serial Communications Terminal

Compatibility: EIA-485
Connectors: Removable screw terminal connector
Max Distance: 3,937’ (1,200 m) max
Status Indication: Separate LEDs for Power (P), Transmit (TX), and Receive (RX)

Modbus® RTU Serial Communications

Meter Address/Slave ID: 1 - 247
Baud Rate: 300 - 19,200 bps
Transmit Time Delay: Programmable between 0 and 199 ms
Data: 8 bit (1 start bit, 1 or 2 stop bits)
Parity: Even, odd, or none with 1 or 2 stop bits
Byte-to-Byte Timeout: 0.01 - 2.54 seconds
Turn Around Delay: Less than 2 ms (fixed)
Note: Refer to the HeliosRegister Tables located at www.predig.com for details.

Isolated 4-20 mA Transmitter Output

Output Source: Process channel A, V, or P, max or min for channel A, V, or highest or lowest max or min of A and V, set points 1-8, Modbus input, or manual control mode
Scaling Range: 1.000 to 23.000 mA for any display range
Calibration: Factory calibrated: 4.000 to 20.000 = 4-20 mA output
Analog Output Programming: 23.000 mA maximum for all parameters: Overrange, underrange, max, min, and break
Accuracy: ± 0.1% of span ± 0.004 mA
Temperature Drift: 0.4 μA/°C max from 0 to 65°C ambient, 0.8 μA/°C max from -40 to 0°C ambient
Note: Analog output drift is separate from input drift.
Isolated Transmitter Power Supply: Terminals I+ & R: 24 VDC ± 10%. Isolated from the input at >500 V. May be used to power the 4-20 mA output or other devices. All models rated @ 40 mA max.
External Loop Power Supply: 35 VDC maximum
Output Loop Resistance:

Power supplyMinimumMaximum
24 VDC10 Ω700 Ω
35 VDC (external)100 Ω1200 Ω

MeterView Pro Programming Software

System Requirements:
Microsoft® Windows® XP/Vista/7/8/10
Communications: Onboard USB (firmware version 4.0 or higher),
RS-232 Adapter or RS-485 Adapter
Meter Address: 1 - 247
Reports:

  • Data logging: Save as CSV file format
  • Configuration: Save as PDC file format or print configuration
Baud Rate: 300 - 19,200 bps
Configuration: One meter at a time
Protocol:
Modbus RTU (requires ProVu firmware version 4.0 or higher)
*Note: Windows® 32/64-bit operating systems

Quick & Easy Scale & Programming Methods

The Helios can be programmed either via the front panel push buttons or free, PC-based MeterView Pro software. MeterView Pro is resident on the Helios and is accessed by a provided USB cable, so it is by far the easiest way to program the Helios. The Helios can be calibrated either by applying a known signal or scaled by entering a desired value with the front panel buttons or MeterView Pro software. Most customers will use the scaling method because it is simpler and does not require a calibrated signal source. Selecting the input to be current or voltage is done with the front panel buttons or MeterView Pro software. Once programming is completed it can be locked with a password.

Free PC-Based MeterView Pro USB Programming Software & Cable

Free PC-Based MeterView Pro USB Programming Software & Cable

The Helios comes preloaded with free MeterView Pro programming software that connects and installs directly to your PC with a standard USB cable, also provided free with each instrument. This eliminates the need to insert CDs, install drivers, or download software from the internet. When you connect your Helios to your PC, MeterView Pro is downloaded to your PC, the software automatically selects the model you are programming, and you’re ready to start programming immediately. Further simplifying the programming process, the Helios can be powered from the USB port, so no need to apply external power while programming your meter. In addition to programming, the software will also allow you to monitor, and datalog a Helios using your PC. You can also generate and save programming files for later use.

Click here to watch the MeterView Pro video

Setup Screen

  • Select Voltage or Current Input
  • Activate Dual-Scale (Level) Function
  • Select Decimal Point
  • Set Line 1 Display Parameters
  • Set Line 2 Display Parameters
  • Set Analog Output Values
  • Enable Manual Control
  • Test Relays & Digital Outputs
Setup Screen

Programming Screen

  • Set Scale Values
  • Set the Number of Points (up to 32)
  • Import from Excel
  • Export to Excel
Programming Screen

Relays Screen

  • Greatly Simplifies Programming a Variety of Relay Features
  • Set Relay Action
  • Set Sampling Time
  • Set Set & Reset Points
  • Set On/Off Time Delays
  • Set Fail Safe Operation
  • Set Input Break Relay Action
Relays Screen

Save/Open Configuration

At the bottom of most MeterView screens are two tabs:

  1. Get Meter Data: This reads the programming of the meter that is currently connected to the PC.
  2. Send Meter Data: Clicking this button, sends current MeterView programming to the meter.
Save/Open Configuration

The configuration file can be sent, or retrieved, from the directory of your choice. This makes it very easy to program multiple meters with the same programming. It is also a great backup utility as well.

Save Meter View Config File

Specifications

System Requirements:
Microsoft® Windows® XP/Vista/7/8/10
Communications:
Onboard USB (firmware version 4.0 or higher),
RS-232 Adapter, or RS-485 Adapter
Meter Address: 1 - 247
Reports:

  • Data logging: Save as CSV file format
  • Configuration: Save as PDC file format or print configuration
Baud Rate: 300 - 19,200 bps
Configuration: One meter at a time
Protocol:
Modbus RTU (requires Helios firmware version 4.0 or higher)

*Note: Windows® 32/64-bit operating systems

Watch Video

Password Protection

The Password menu is used for programming three levels of security to prevent unauthorized changes to the programmed parameter settings:

Pass 1: Allows use of function keys and digital inputs
Pass 2: Allows use of function keys, digital inputs and editing set/reset points
Pass 3: Restricts all programming, function keys, and digital inputs

4-20 mA Output & Relay

4-20 mA Analog Output

The isolated analog output can be configured to represent the process variable (PV), maximum (peak) value, minimum (valley) value, the value for any of the eight relay set points, or Modbus input. While the output is nominally 4-20 mA, the signal will accurately accommodate under- and over-ranges from 1 to 23 mA.

The 4-20 mA output can be reversed scaled such that 4 mA represents the high value and 20 mA represents the low value. For instance, a 4-20 mA output signal could be generated as the meter went from 100.0 to 0.0. For applications where the input was linearized by the Helios, the 4-20 mA output will represent that linearized value.

Connections

The Helios can provide 40 mA at 24 VDC to power the 4-20 mA output signal or an external power supply can be used:

4-20 mA Output Powered by PD2-64004-20 mA Output Powered by External Power Supply

The internal 24 VDC power supply powering the analog output may be used to power other devices, if the analog output is not used. The I+ terminal is the +24 V and the R terminal is the return.

The 4-20 mA output can either be programmed using the front panel push buttons or free MeterView Pro software.

Front Panel Push Button Programming

The 4-20 mA analog output can be scaled to provide a 4-20 mA signal for any display range selected. No equipment is needed to scale the analog output; simply program the display values to the corresponding mA output signal. The Analog Output menu is used to program the 4-20 mA output based on display values.

Front Panel Push Button Programming
MeterView Pro Software Programming

When a meter is programmed as shown below, the output will be 4.00 mA when the display reads 0 and the output will be 20.00 mA when the display reads 150.0.

MeterView Pro Software Programming

The meter can be set up for reverse scaling as shown below: the output will be 4.00 mA when the display reads 150.0 and the output will be 20.00 mA when the display reads 0.

MeterView Pro Software Programming

Source: Source for generating the 4-20 mA output (e.g. Amps)
Overrange: Analog output value with display in overrange condition
Underrange: Analog output value with display in underrange condition
Break: Analog output value when current input break is detected
Max: Maximum analog output value allowed regardless of input
Min: Minimum analog output value allowed regardless of input

MeterView Pro Software Programming

Relays for Alarm & Control Applications

Adding relays to the Helios meter turns it into a sophisticated alarm device as well as a powerful, yet simple, alternative to a more complicated PLC system for control applications. The Helios can be equipped with four 3 A Form C (SPDT) internal relays. Relays are highly user-configurable as the following screen shot from MeterView Pro indicates:

Relays for Alarm & Control Applications

*Values are intended to show programming choices. They are not intended to represent an actual application.

Setting Set and Reset Points (HI / LO Alarms)

All relays are independent of each other and may be programmed as high or low alarms with user desired set and reset points. Setting a set point above a reset point results in a high alarm and setting a set point below a reset point results in a low alarm. Alarms have 0 – 100% deadband and set and reset points may be set anywhere in the range of the meter.

Resetting the Relays (Action in MV Pro)

All relays are independent of each other and may be programmed to reset (Action in MV Pro) in the following ways:

  • Automatic: Alarm will reset automatically once the alarm condition has cleared.
  • Automatic/Manual: Alarm will reset automatically once the alarm condition has cleared but can also be reset at any time with a switch wired across terminals F4 and Common*.
  • Latching: Alarm must be reset manually and can be done so at any time with a switch wired across terminals F4 and Common*.
  • Latching with Reset after Cleared: Alarm must be reset manually and can only be done so after the alarm condition has cleared with a switch wired across terminals F4 and Common*.

* Or via one of the four digital inputs

Time Delay (On and Off)

In many applications it is desirable to wait before turning off or on a relay – such as waiting for a process to settle before taking action. Each relay on the Helios can be programmed with independent on and off time delays of 0 to 999.9 seconds to achieve this.

Relays Auto Initialization

When power is applied to the meter, the front panel LEDs and alarm relays will reflect the state of the input to the meter.

Signal Loss or Current Input Break Relay Operation

When the meter detects a break in the current input, the relay will go to one of the following selected actions:

  1. Turn On (Go to alarm condition)
  2. Turn Off (Go to non-alarm condition)
  3. Ignore (Processed as a low signal condition)
User Selectable Fail-Safe Operation

All relays are independent of each other and may be programmed for user selectable fail-safe operation. With the fail-safe feature activated, the relays will transfer to the alarm state on power loss to the meter.

Front Panel LEDs

The meter is supplied with four alarm points that include front panel LEDs to indicate alarm conditions. This standard feature is particularly useful for alarm applications that require visual-only indication.

Manual Output Control

Take control of any output with this feature. All relays can be forced ON or OFF, and the 4-20 mA output signal can be set to any value within its range. When the relays and 4-20 mA output are controlled manually, an LED labeled “M” is turned on and the associated Alarm LEDs (1-8) flash every 10 seconds indicating that the meter is in manual control mode.

Manual Output Control LED Indicator
Sampling Function (PV Triggered Timed Relay)

The sampling function allows the operator to set a relay as a “sampling” relay. When the PV reaches that set point, it will close that relay’s contacts for a preset period of time (0.1 to 5999.9 seconds).

Interlock Relay(s)

This function allows a process to use one or more very low voltage input signals or simple switch contacts to control the state of one or more internal “interlock” relays. A violation (i.e. loss of input, open switch, or open circuit) forces one or more N/O interlock relay contacts to open. One input can be used in series with a number of interlock switches, or up to four inputs can be required to force-on one (or more) internal interlock relays. Please see Safety Interlock on the ProVu Series whitepaper on our website for more information.

Interlock Relay(s)
Switching Inductive Loads

The use of suppressors (snubbers) is strongly recommended when switching inductive loads to prevent disrupting the microprocessor’s operation. The suppressors also prolong the life of the relay contacts. Precision Digital offers the PDX6901 Snubber with 0.01μF/470Ω flexible leads.

Application Examples

The PD2-6400 Helios can be used to display application data for voltage, current, or both. Each Channel, Voltage or Current, can be scaled independently. The following examples show just a few of the PD2-6400's application capabilities using generators and transformers. Each example is followed by a wiring diagram that shows proper switch position for the meter.

Voltage Measurement for a Generator Driving a Load

Voltage Input Application ExampleVoltage Input Wiring Example with AC Switch Selected

Apparent Power Measurement Using a Current Transformer

Voltage/Current Input Application ExampleVoltage/Current Input Wiring Example with AC Switch Selected

Current Measurement for a Lighting System

Current Input Application ExampleCurrent Input Wiring Example with AC Switch Selected

Converting High AC Current with the PDA6405 Split Core AC Current Transformer

Measuring Current with PDA6405-100 Current Transformer and PD2-6400 large display high voltage & current meterPD2-6400 Connections from PDA6405 Current Transformer with AC Switch Selected
PDA6405 Split Core AC Current Transformers
PDA6405 Split Core AC Current Transformer

Precision Digital offers a line of split core AC current transformers that convert the high AC current flowing through a cable or wire to a 0-5 AAC output that can be displayed on a PD6400. The PDA6420 works with a PD6400 because it puts out a 4-20 mA signal. They are available in ranges of 100, 200, 400, 600, and 1000 AAC. These nonintrusive devices feature split core convenience for easy installation and are a cost effective solution for monitoring load or proof of operation. The PDA6420 current transformers are ideal for monitoring current loads on pumps, driving fans and blowers, and sensing the status of heating coils and lighting.

Specifications

Current Range: 100A, 200A, 400A, 600A, and 1000A (based on model)
Output: 0-5 A
Accuracy: +/- 1%
Burden: 2VA
Insulation Voltage: CAT IV 250 or CAT III 600VAC
Maximum Primary Voltage: 5000 VAC (Insulated Conductor)
Phase Angle: Less than 2 degrees at 50% of rated current
Frequency Range: 50/60 Hz
Operating Temperature: -40 to 55°C
Humidity: 0-95% RH non-condensing, Indoor use only
Pollution Degree: 2
Leads: 18AWG 1.0 m cable
UL File Number: UL recognized for US and Canada (E341727)

Digital Communications

Modbus® RTU Serial Communications

With onboard RS-485 serial communication, the PD2-6400 can communicate with any Modbus master device using the popular Modbus communications protocol that is included in every Helios. In addition to the typical Modbus capabilities of reading PVs and writing set points, below are some examples of other things that can be done with the meter’s Modbus communications:

  • Send a 6-character message to the lower display upon an event
  • Convert a digital value to a 4-20 mA signal
  • Remoteusercontrol(i.e.changesetpoints,acknowledge alarms)
  • Input a Modbus digital PV (in place of analog input)
  • Remote override of any, or all, relays and analog outputs
Modbus® RTU Serial CommunicationsClick here for more information on the Helios's Modbus capabilities

Additional Communication Modules

In addition to RS-485 communications which is a standard feature, the Helios is available with serial communications modules for RS-232 and USB.

PDA7485-I

PDA7485-I
RS-232 to RS-422/485 Isolated Converter

PDA8485-I

PDA8485-I
USB to RS-422/485 Isolated Converter

For more info on serial converters, click here

*All adapters and connectors supplied with appropriate cables.

On-Board Digital Inputs and Outputs

The PD2-6400 includes five (5) digital inputs and four (4) digital outputs standard. Since the Helios is a large display meter it is often mounted in areas where it is not convenient to access the programming buttons. The digital inputs can be set up to mimic the four programming buttons on the Helios meter, thus making it possible to mount remote buttons for programming in a more convenient location. In addition, the digital inputs can also be used to reset the total, operate the tare feature, reset the tare, and more. The digital outputs can be used to drive alarming devices or as a means to communicate alarm conditions with a PLC.

On-Board Digital Inputs and Outputs

Physical Features

The most striking physical feature of the Helios meter is its dual-line 6-digit display with 1.8" high super-bright LEDs. These allow the display to be read from up to 100 feet away, even in bright sunlight.

The Helios is designed for ease-of-use in industrial applications where it will be exposed to wet, dusty, hot, cold and other adverse conditions. The Helios is housed in a rugged NEMA 4X enclosure, can operate over a wide temperature range, includes removable screw terminal connectors, and is UL Listed for electrical safety. All of these features are backed by a 3-year warranty.

Super-Bright 1.8" High LED Display

The Helios features super-bright 1.8" high LEDs; three times the height of standard digital panel meters.

Super-Bright 1.8inch High LED Display

Type 4X / NEMA 4X Front Panel

Type 4X / NEMA 4X Front Panel

Not only does the Helios’s front panel UL Type 4X approval indicate it is waterproof, but it also indicates it is rugged. Part of the UL Type 4X test is to drop a 2 inch solid stainless steel ball from 8 feet on top of the meter’s cover.

Integral Holes for Wall Mounting

The Helios’s back panel includes four holes for convenient wall mounting.

Integral Holes Locations

Pipe Mounting Kit

The meter can also be mounted to a pipe using the optional pipe mounting kit (PDA6260). This kit includes two mounting plates, two U-bolts, and the necessary nuts and bolts. See PD2-6400 manual for instructions.

Vertical Pipe MountingHorizontal Pipe Mounting

USB Port for Easy Connection to MeterView Pro Free Software

USB Port for Easy Connection to MeterView Pro Free Software

Wide Operating Temperature Range

The Helios can operate from -40 to 65°C (-40 to 150°F) meaning it can be installed in a wide variety of indoor and outdoor industrial applications. And over this range the Helios will drift no more than 0.005% of calibrated span/°C max from 0 to 65°C ambient and 0.01% of calibrated span/°C max from -40 to 0°C ambient.

Removable Screw Terminal Connectors

Industrial applications require screw terminal connections for easy field wiring and the Helios goes one step further in convenience by making them removable also.

UL Listing for Electrical Safety

UL & C-UL Listed: USA & Canada
UL 508 Industrial Control Equipment
UL File Number: E160849
Front Panel: UL Type 4X, NEMA 4X, IP65
Low Voltage Directive:
EN 61010-1:2010. Safety requirements for measurement, control, and laboratory use.

Operational Features

Function Keys, F4 Terminal, Digital Inputs

There are two ways the user can interact with the Helios to perform a variety of useful functions:

1. Three Buttons Under the Front Cover

The default settings for the function keys are:

Three Buttons Under the Front Cover
2. Built-in Digital Inputs/Outputs

The Helios comes with five digital inputs and four digital outputs. The digital inputs can operate with the interlock relays feature, force relays on from a signal from a PLC or relay on other equipment, and much more. The digital inputs can also be used to mimic the programming buttons, which are located behind a door and generally not accessible during operation. The digital outputs can be used to send signals to PLCs and other devices.

Built-in Digital Inputs/Outputs

Remote Operation of Front Panel Buttons

The Helios’s programming buttons are located behind a door and generally not accessible during operation. Digital inputs are provided that can be wired to remote buttons to operate the programming buttons in a convenient location. MeterView Pro provides an easy way to do this programming:

Remote Operation of Front Panel Buttons

Max / Min Display

Max/Min (or Peak/Valley) is standard on the Helios PD2-6400. Either display can be configured to show either maximum or minimum excursion since last reset. The displays can also be configured to toggle between Max and Min values. Both values can be simply reset from the front panel.

ProVu Function Keys

Remote Operation Using PDA2364-MRUE Control Station

The PD2-6400's four internal programming and operations buttons can be remotely controlled by using the PDA2364-MRUE 4-button control station accessory as shown in the diagram below.

Remote Operation Using PDA2364-MRUE Control Station

MeterView Pro Monitoring & Datalogging Software

Not only does free MeterView Pro software greatly simplify setup and programming of the Helios, it can also be used to monitor and datalog your process.

MeterView Pro Monitoring & Datalogging Software
  • Custom Tags: i.e. Power
  • Custom Units: i.e. Amps, Volts
  • Alarm Status Indicators
Click here to watch the MeterView Pro video
Datalog Report

Collected data logger information can be sent to a CSV file for importing into a spreadsheet program. Below is an example of one such file. Of course, once within the spreadsheet, much can be done to customize the data.

Datalog Report
Relay Control

Relays can be controlled from MeterView Pro for testing purposes. This is commonly done to determine whether the relays are functioning properly. In the Setup window, under Relay and Digital Out Test you have the option of selecting the relays you want in an ON state or OFF state and also whether you want to leave the relays in manual control or to return them to automatic operation.

Plastic Control Stations For The Helios PD6400

The PDA2360 series of plastic control stations provide a convenient way to remotely control devices such as Precision Digital’s Helios PD2-6400. The PDA2364-MRUE four-position control station mimics the Helios’s four buttons behind the front panel door: Menu, Right Arrow, Up Arrow, and Enter. The PDA2360-E is an emergency stop button and the PDA2361-A is used to acknowledge an alarm.

Plastic Control Stations For The Helios PD6400
  • Complete Pre-Assembled Stations
  • Normally Open (NO) Spring Return Plastic Bezel Pushbuttons
  • Trigger Action Turn to Release Pushbutton (PDA2360-E only)
  • IP65 / NEMA 4, 4X and 13 Rated
  • Four-Position Control Station for Remote Operation of Helios Buttons
  • Wall Mountable
PDA2360 Series Control Stations
ModelDescription
PDA2360-EEmergency Stop Button
PDA2361-A1 Black Ack Button
PDA2364-MRUE4 Black Buttons: Menu, Right, Up, Enter

Function Key, Digital Inputs, & Digital Outputs Descriptions

The following table describes the actions that Helios function keys and digital inputs can be programmed to perform. The table also describes how the digital outputs can be used to remotely monitor the Helios’s alarm relay states, or the states of a variety of actions and functions executed by the meter.

DisplayDescriptionItem
rSt HiReset the stored maximum display valueFK, DI, DO
rSt LoReset the stored minimum display valueFK, DI, DO
rSt HLReset the stored maximum & minimum display valuesFK, DI, DO
tArECapture tare and zero the displayFK, DI, DO
rSt trReset captured tare and resume normal operationFK, DI, DO
rELAYDirectly access the relay menuFK, DI
SEt 1*Directly access the set point menu for relay 1 (*through 8)FK, DI
rLY dDisable all relays until a button assigned to enable relays (Rly E) is pressedFK, DI
rLY EEnable all relays to function as they have been programmedFK, DI
D HoLdHold current relay states and analog output as they are until a button assigned to enable relays (Rly E) is pressedFK, DI
d HoLdHold the current display value, relay states, and analog output momentarily while the function key or digital input is active. The process value will continue to be calculated in the background.FK, DI
Ln1 HiDisplay maximum display value on line 1FK, DI
Ln1 LoDisplay minimum display value on line 1FK, DI
Ln1 HLDisplay maximum & minimum display values on line 1FK, DI
Ln2 HiDisplay maximum display value on line 2FK, DI
Ln2 LoDisplay minimum display value on line 2FK, DI
Ln2 HLDisplay maximum & minimum display values on line 2FK, DI
F On 1*Force relay 1 (*through 4) into the on state. This is used in conjunction with a digital input expansion module to achieve interlock functionality.FK, DI
ContrLDirectly access the control menuFK, DI
DiSAbLDisable the selected function key or digital I/OFK, DI
AcHAcknowledge all active relays that are in a manual operation mode such as auto-manual or latchingFK, DI, DO
rESEtDirectly access the reset menuFK, DI
mEnuMimic the menu button functionality (digital inputs only)DI
riGHtMimic the right arrow/F1 button functionality (digital inputs only)DI
uPMimic the up arrow/F2 button functionality (digital inputs only)DI
EntErMimic the enter/F3 button functionality (digital inputs only)DI
ALm 1*Provide indication when alarm 1 (*through 8) has been triggered (digital outputs only)DO

FK: Function Keys DI: Digital Inputs DO: Digital Outputs

Programmable function keys video

Connections

Connector Labeling for Fully Loaded PD2-6400

Dimensions Units: Inches (mm)

Front and Side View

Front and Side View

Wall Mounting Holes Location

Wall Mounting Holes Location

Conduit Holes Location

Conduit Holes LocationDownload free 3-D CAD files
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Choose Your Options

Why you should buy:

  • Large Dual Line Display
  • High Current & High Voltage Inputs