UL Listing

The Javelin D is an easy-to-use, 1/8 DIN digital voltmeter that accepts a DC voltage input up to 300 VDC. It features a built-in 4-20 mA isolated transmitter, RS-485 serial communication capability, and a NEMA 4X/IP65 rated front. The four front panel buttons provide quick and simple access to programming and operation functions. There are no jumpers, and no need to ever open the case. After completing setup of one meter, additional meters can be cloned using the time-saving copy function. The optional Form C relays can be used for alarm indication or process control applications. The Modbus® RTU serial communication upgrade enables the Javelin D Digital Voltmeter to operate as a Modbus® slave in RS-485 multi-point data acquisition systems.


  • 0-300 VDC input
  • NEMA 4X, IP65 front
  • Scale in engineering units
  • Sunlight readable LED display
  • 4-20 mA analog output
  • Two form C 3 A relays option
  • RS-485 serial communications
  • Modbus RTU option
  • Data acquisition with MeterView


Input: 0-300 VDC
Display: 0.56" (14.2 mm) red LED, 4 digits (-1999 to 9999)
Accuracy: ±0.05% FS ±1 count
Display Intensity: Eight user selectable intensity levels
Decimal Point: Up to 3 decimals: d.ddd, dd.dd, ddd.d, or dddd
Front Panel: NEMA 4X, IP65; panel gasket provided
Programming Methods: Four front panel buttons, cloning with Copy feature, and Modbus registers
Noise Filter: Programmable 2 to 199 (0 will disable filter)
Display Update Rate: 5/second
Overrange: Display flashes 9999
Underrange: Display flashes -1999
Recalibration: Input is calibrated at the factory; recalibration is recommended at least every 12 months.
Temperature Drift: ±50 PPM/°C maximum
Input Impedance: Greater than 1 M.
Max/Min Display: Stored until reset by user or meter is turned off.
Password: Restricts modification of programmed settings
Non-Volatile Memory: Settings stored for a minimum of ten years.
Power Options: 85-265 VAC, 50/60 Hz; 90-265 VDC, 20 W max or 12-36 VDC; 12-24 VAC, 6 W max.
Required Fuse: UL Recognized, 5 A max, slow blow; up to 6 meters may share one fuse.
Normal Mode Rejection: 64 dB at 50/60 Hz
Isolation: 4 kV input/output-to-power line; 500 V input-to-output or output-to-24 VDC supply
Operating Temperature: 0 to 65°C
Storage Temperature: -40 to 85°C
Relative Humidity: 0 to 90% non-condensing
Connections: Removable screw terminals accept 12 to 26 AWG
Enclosure: 1/8 DIN, high impact plastic, 94V-0, color: gray
Weight: 8 oz (227 g) (including options)
UL File Number: E160849; 508 Industrial Control Equipment
Warranty: 3 years parts & labor
Extended Warranty: 1 or 2 years, refer to Price List for details

Voltage Measurement Input

Input: 0 to 300 VDC
Accuracy: ±0.05% of full scale ±1 count
Temperature Drift: 50 PPM/°C from 0 to 65°C ambient
Decimal Point: Up to three decimal places: d.ddd, dd.dd, ddd.d, or dddd
Input Impedance: Greater than 1 MΩ
Calibration Range: An Error message will appear if input 1 and input 2 signals are too close together. Minimum Span: 10 VDC

Serial Communications

Compatibility: EIA-485
Meter Address: PDC protocol: 0 to 99, Modbus protocol: 1 to 247
Baud Rate: 300 to 19,200 bps
Transmit Time Delay: Programmable 0 to 199 ms
Data: 8 bit (1 start bit, 1 stop bit)
Parity: None, even, or odd (Modbus only; PDC protocol does not use parity)
Byte-to-Byte Timeout: 0.01 to 2.54 seconds (Modbus only)
Turn Around Delay: Less than 2 ms (fixed)

Refer to PDC and Modbus Serial Communications Protocol manuals for details.


Rating: 2 Form C (SPDT); rated 3 A @ 30 VDC or 3 A @ 250 VAC resistive load; 1/14 HP @ 125/250 VAC inductive loads
Deadband: 0-100% FS, user selectable
High or Low Alarm: User may program any alarm for high or low
Relay Operation:
   1. Automatic (non-latching)
   2. Latching
   3. Pump alternation control
Relay Reset: User selectable via front panel buttons or PC
   1. Automatic reset only (non-latching)
   2. Automatic + manual reset at any time (non-latching)
   3. Manual reset only, at any time (latching)
   4. Manual reset only after alarm condition has cleared (latching)
Automatic Reset: Relays reset when input passes the reset point
Manual Reset: Front panel button, MeterView, Modbus registers
Time Delay: 0 to 199 seconds, on and off delays; programmable
Fail-Safe Operation: Programmable, independent for each relay. Relay coils are energized in non-alarm condition. In case of power failure, relays will go to alarm state.

Isolated 4-20 mA Transmitter Output

Output Range: 1.00 to 23.00 mA typical
Calibration: Factory calibrated 4.00 to 20.00 mA
Accuracy: ±0.1% FS ±0.004 mA
Temperature Drift: 50 PPM/°C
Note: Analog output drift is separate from input drift
Transmitter Supply: Isolated 24 VDC ±10% @ 200 mA max
Isolation: 500 V input-to-output or output-to-24 VDC supply; 4 kV input/output-to-power line
External Power: 35 VDC maximum
Output Loop Resistance:
 Loop Resistance
Power supplyMinimumMaximum
24 VDC10Ω700Ω
35 VDC100Ω1200 Ω (external)


PD644 connections

Meter with Relays Options

Mounting Dimensions

DC Voltage Digital Panel Meter, Mounting Dimension


Choose Your Options