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PD691 4½ Digit Strain Gauge Meter


This product has been discontinued.

Features Options Specifications

Ordering Information Documentation

4 1/2 Digit Strain Gauge Meter PD691
UL CE approval
  • 0-30 mV, 0-200 mV, ±15 mV, ±100 mV inputs
  • 5, 10, or 24 VDC field selectable excitation
  • NEMA 4X, IP65 front panel
  • 0.56" (14.2 mm) red LED display
  • 4½ digits + extra zero
  • Max display or peak hold feature
  • Capture or programmable tare function
  • 115 VAC power
  • 2 or 4 relays + 4-20 mA output options



 

GENERAL FEATURES


The PD691 is a high performance, industrial-grade 4½ digit Strain Gauge Meter. It accepts all the standard strain gauge and load cell signals: 0-30 mV, 0-200 mV, ± 15 mV and ± 100 mV and displays these signals in engineering units on a 4½ digit display. The display also includes an extra zero which may be used to handle numbers up to ±199,99(0).

Single Button Scaling

Single Button Scaling means the PD691 can be completely programmed using only one button. There are no complicated menu trees to navigate or button-pushing sequences to memorize. Simply press the ENTER button to initiate the automatic menu scan. When the desired routine appears press ENTER again. Once in a routine, press the ENTER button when the display reads the desired value. It’s that simple!


PD691 4 1/2 Digit Strain Gauge Meter Single Button Scaling Set Tare PD691 4 1/2 Digit Strain Gauge Meter Single Button Scaling to calibrate PD691 4 1/2 Digit Strain Gauge Meter Single Button Scaling to program alarms
To Set Tare:
Press ENTER when meter reads
To Calibrate:
Press ENTER when meter reads
To Program Alarms:
Press ENTER when meter reads

NEMA 4X & IP65 Front Panel

Wet, dirty and dusty environments don’t bother the PD691 NEMA 4X & IP65 front panel so it can be installed in almost any panel in the plant. That means plant operators can have the important information right where they need it most, on the shop floor.

Bright Steady Display for Big Numbers

The PD691 4½ digit + extra zero display is great for displaying big numbers. Even when displaying large numbers, the PD691 display is steady and quick responding. The extra zero may be switched on to display ±19,999(0).

Field Selectable Excitation Power Supply

The internal power supply can provide either 5, 10, or 24 VDC power, (field select). Typical use for the 5 or 10 VDC supply is to power a strain gauge. The 24 VDC supply may be used to power the 4-20 mA output option. This standard feature saves time and money by simplifying wiring and eliminating the cost of an external power supply.
PD 691 4 1/2 Digit Strain Gauge Meter  Field Selectable Excitation Power Supply

Peak Hold

The peak-hold feature captures the highest displayed value and stores it in memory for later viewing. By entering the
routine the operator can display the peak value. a green LED labeled P will illuminate indicating the display is showing the peak value. Pressing the enter button again and entering theroutine will cause the last stored peak value to be erased from memory and a new peak value to be captured.

PD691 4 1/2 Digit Strain Gauge Meter Peak Hold
PD691 Indicating a Peak Hold Value


Tare

The PD691 can be set for either Capture or Programmable Tare. Capture Tare sets a currently displayed reading to zero via the front panel Tare button. The operator may reset Capture Tare at any time in the field. Programmable Tare will automatically subtract a set tare value from the actual reading. A green LED labeled T will illuminate indicating the display is showing a tared value.

4 1/2 Digit Strain Gauge Meter Tare
PD691 Indicating a Tared Value


Ratiometric Operation

Ratiometric operation allows the meter to compensate for small fluctuations in the excitation power supply. A voltage drift of ±10% will not affect the display value of the PD691 when in Ratiometric mode. Selecting normal operation results in the unit not compensating for voltage fluctuations. The display value will shift as the voltage changes.

Ratiometric Operation4 Visual Alarms Standard

Every PD691 comes standard with 4 independent alarms. Each alarm is easily programmed for high or low set point and 0-100% deadband. Front panel alarm status LEDs assist in set/reset point programming and are perfect for visual-indication-only applications. Options are available for 2 and 4 relays.

Ratiometric Operation Alarm/Relay Programming

Pressing the ENTER button when the display readsinitiates a scan of the alarm set and reset points. First, the display flashes Alarm #1 Set Point and indicates this by illuminating the #1 LED and the “S” LED. This Set Point may be changed using the ENTER button. Next the display flashes alarm #1 Reset Point and indicates this by illuminating
the #1 LED and the “R” LED. This Reset Point may also be changed using the ENTER button. The remaining Set and Reset Points are programmed in a similar fashion.

PD691 4 1/2 Digit Strain Gauge Meter Alarm Relay Programming Alarm #2
PD691 Alarm #2
Set Point is adjusted to 80000

PD691 4 1/2 Digit Strain Gauge Meter Alarm Relay Programming Alarm #2
PD691 Alarm #2
Reset Point is adjusted to 20000



Alarm Status Indication

When an alarm occurs, an LED will illuminate to indicate which alarm has tripped. This LED will stay illuminated until the meter returns to the non-alarm state.
PD691 4 1/2 Digit Strain Gauge Meter Alarm Status Indication
PD691 indicating that Alarm #2
is in alarm condition.

Linearization Feature

Displaying non-linear signals is a snap with the linearization feature. The user can input up to 11 calibration points and corresponding displays to handle a wide variety of non-linear signal applications.


OPTIONS

The PD691 Strain Gauge Meter can be equipped with options for 2 or 4 relay contacts and isolated 4-20 mA transmitter output. These options may be combined in any configuration to satisfy a wide variety of applications. In fact, a fully loaded model PD691-3-18 includes linearization, 4 relays and isolated 4-20 mA transmitter output.


Relay Options

The PD691 is available with 2 or 4 SPDT relays. The relays are rated 2 A @ 250 VAC, can be programmed for automatic reset or automatic + manual reset, and for 0-100% deadband.

Isolated 4-20 mA Output Option

The PD691 can be equipped with an isolated 4-20 mA output signal option that can be programmed to produce a 4-20 mA output signal for virtually any input. The 4-20 mA output signal can be powered either by the internal or an external power supply. If the internal power supply is used for the 4-20 mA output, it is not available to power a strain gauge.
The 4-20 mA output provides 500 VDC or peak AC, input-to-output or input/output-to-power isolation.

PD691 4 1/2 Digit Strain Gauge Meter Isolated 4-20 mA Output Option Option Card Pin-outs
Notes:
1. Alarm acknowledgment terminals (ACK and COM) located on the main board.
2. In alarm condition, NC contact is connected to common in the fail-safe mode.


Mounting Dimensions

PD691 4 1/2 Digit Strain Gauge Meter Mounting Dimensions
Notes:
1. Panel cutout required: 1.772" x 3.622" (45 mm x 92 mm) 1/8 DIN
2. Panel thickness: 0.125" - 0.250" (3.17 mm - 6.34 mm)
3. clearance: allow 6 inches (152 mm) behind the panel


Power Supply Wiring Diagrams

The internal power supply can provide either 5, 10, or 24 VDC.

PD691 4 1/2 Digit Strain Gauge Meter Power Supply Wiring Diagrams

Relays

Rating: 2 or 4 Form C (SPDT); rated 2 A @ 30 VDC or 2 A @ 250 VAC resistive load; 1/14 HP @ 125/250 VAC inductive loads
Reset: User selectable
   1. Automatic when the input passes the reset point.
   2. Automatic plus manual (via user supplied switch).
Manual reset resets all manually resettable relays.
Fail-Safe Operation: Relay coils are energized in non-alarm condition. In case of power failure, relays will go to alarm state. Fail-safe may be disabled with internal jumper.
Auto Initialization: When power is applied to the meter, the relays will always reflect the state of the input to the meter.
Deadband: 0-100%, user selectable

Isolated 4-20 mA Transmitter Output

Scaling Range: Anywhere in range of meter, 501 count minimum span; reverse scaling allowed.
Accuracy: ±0.1% FS ±0.004 mA
Output Loop Resistance:
  Loop Resistance
Power supply Minimum Maximum
24 VDC 10 Ω 600 Ω
35 VDC (external) 600 Ω 1000 Ω
Isolation: 500 V input-to-output or input/output-to-24 VDC supply
External Loop Power Supply: 35 VDC maximum
 

SPECIFICATIONS

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

General

Inputs: Field selectable: 0-30 mV, 0-200 mV, ±15 mV ±100 mV
Display: 0.56" (14.2 mm) red LED, 4½ digits + extra zero may be switched on to display ±19,999(0)
Accuracy: 0.05% FS ±1 count
Ratiometric Operation: Deviation less than 0.1% FS ±1 count, with±10% variation in excitation voltage
Zero Stability: 0.5 μV/°C
Span Stability: 0.005% FS/°C
Front Panel: NEMA 4X, IP65; panel gasket provided
Calibration Range: User programmable over entire range of meter
Input Impedance: 20 k Ω
Sensor Power Supply: Isolated, selectable: 5 VDC or 10 VDC±5% @ 50 mA; or 24 VDC ±5% @ 20 mA. Available for either strain gauge input or 4-20 mA output option, but not both.
Max Display (Peak): Stored until reset by user or meter is turned off
Max Display Indication: Front panel LED
Tare:
  Capture Tare - Sets current display to Zero via front panel TARE button.
  Programmable Tare - Automatically sets TARE to a programmable preset value.
Tare Indication: Front panel LED
Non-Volatile Memory: Settings stored for a minimum of 10 years.
Lockout: Switch 8 restricts modification of programmed settings.
Power Options: 115 VAC ±10%, 50/60 Hz, 10 VA
Isolation: 1500 VAC
Normal Mode Rejection: 64 dB at 50/60 Hz
Operating Temperature: 0 to 60°C
Storage Temperature: -40 to 85°C
Relative Humidity: 0 to 90% non-condensing
Enclosure: 1/8 DIN, high impact plastic, UL 94V-0, color: black
Weight: 19.7 oz (559 g) (including options)
Connections: Removable screw terminals accept 12 to 22 AWG
Alarm Points: 4, any combination of high or low alarms
Alarm Status Indication: Front panel LED
Alarm Deadband: 0-100% FS, user selectable
UL File Number: E160849; 508 Industrial Control Equipment
Warranty: 2 years parts & labor


ORDERING INFORMATION

Model Description
PD691-3-N        Strain Gauge/Load Cell Meter
No Options
Powered from 115 VAC
PD691-3-14        Strain Gauge/Load Cell Meter
2 Relays
Powered from 115 VAC
PD691-3-15        Strain Gauge/Load Cell Meter
4-20 mA Output
Powered from 115 VAC
PD691-3-16        Strain Gauge/Load Cell Meter
2 Relays + 4-20 mA Output
Powered from 115 VAC
PD691-3-17        Strain Gauge/Load Cell Meter
4 Relays
Powered from 115 VAC
PD691-3-18        Strain Gauge/Load Cell Meter
4 Relays + 4-20 mA Output
Powered from 115 VAC
PD691-4-N        Strain Gauge/Load Cell Meter
No Options
Powered from 230 VAC
PD691-4-14        Strain Gauge/Load Cell Meter
2 Relays
Powered from 230 VAC
PD691-4-15        Strain Gauge/Load Cell Meter
4-20 mA Output
Powered from 230 VAC
PD691-4-16        Strain Gauge/Load Cell Meter
2 Relays + 4-20 mA Output
Powered from 230 VAC
PD691-4-17        Strain Gauge/Load Cell Meter
4 Relays
Powered from 230 VAC
PD691-4-18        Strain Gauge/Load Cell Meter
4 Relays + 4-20 mA Output
Powered from 230 VAC


 

DOCUMENTATION

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