Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 873EC-JIPFGZ |
| Brand | Foxboro |
| Measurement | Conductivity / chemical concentration |
| Sensor Type | Toroidal (electrodeless); pairs with 871EC or 871FT sensors |
| Analog Output | Isolated 4–20 mA (quantity depends on housing/suffix) |
| Alarm Outputs | Dual relay alarms (typically SPDT, rated per nameplate) |
| Temperature Compensation | Automatic, via integrated RTD/thermistor in sensor |
| Display | Local LCD for measurement, status, and configuration |
| Power Supply | Typically 100 VAC or 220 VAC, or 24 VDC depending on suffix |
| Enclosure | NEMA 4X / IP65 rated for panel or field mounting |
| Communication | FOXCOM digital output on applicable versions |
| Compatible Sensors | Foxboro 871EC, 871FT toroidal conductivity sensors |
| Condition | Surplus / tested; verify nameplate power and output configuration |
| Warranty | 12 months on tested units |
Product Introduction
The Foxboro 873EC-JIPFGZ is an electrochemical analyzer transmitter from the Foxboro 873EC series. It measures liquid conductivity or chemical concentration using a toroidal sensor, then converts the reading into a 4–20 mA signal for process control systems.It is commonly used in water treatment, chemical processing, power plant chemistry, and food or pharmaceutical applications where electrodeless measurement avoids fouling and corrosion. The unit provides local display, dual alarm relays, and automatic temperature compensation. Because the suffix “JIPFGZ” defines power, output, enclosure, and alarm options, the exact configuration must be confirmed from the nameplate — do not assume it matches another 873EC unit by series number alone.
Installation & Configuration Guide
Preparation (10 min)
- Confirm the existing nameplate: power supply, output type, alarm rating, and sensor type.
- Identify whether it is paired with an 871EC or 871FT sensor.
- Check cable length, junction box condition, and sensor cell factor.
- Lock out power before removing wiring.
Removal (5–10 min)
- Photograph terminal labels, power wiring, output wiring, and alarm relay wiring.
- Label each wire before disconnecting.
- Remove panel clips or field enclosure fasteners.
- Inspect the rear connector for corrosion or burnt terminals.
Installation (10 min)
- Mount the replacement in the same orientation and enclosure type.
- Reconnect power, 4–20 mA output, and alarm relays per the saved photos.
- Verify the sensor cable is intact and properly seated.
- Confirm the sensor cell factor matches the analyzer configuration.
Power-On & Test (10 min)
- Apply rated power and verify the display boots without error codes.
- Check the 4–20 mA output against a known reference or simulator.
- Test both alarm relays for correct trip and reset behavior.
- Verify temperature compensation is active and reasonable for the process.
- If connected to a DCS or PLC, confirm the receiving channel reads the correct scaled value.
Troubleshooting Quick Reference
| Symptom | Most Likely Cause | Fast Check |
|---|---|---|
| Blank display | No power or wrong voltage | Measure supply at terminals; verify fuse |
| Erratic conductivity reading | Fouled sensor or air bubbles | Inspect sensor; flush process line |
| 4–20 mA stuck at 0 or 20 mA | Output scaling mismatch | Check LO/HO scaling and loop wiring |
| High reading after cleaning | Wrong cell factor | Confirm sensor model and CF entry |
| Alarm not tripping | Relay wiring or setpoint error | Force alarm in config; measure relay contacts |
| Temperature reading wrong | RTD/thermistor fault | Check sensor temperature circuit and wiring |
| Communication failure | FOXCOM/HART not enabled | Verify communication setting and address |
Dimensions, Mounting & Wiring Notes
- Mounting: Panel-mount or field-mount depending on suffix.
- Enclosure: Typically NEMA 4X / IP65 for washdown and outdoor areas.
- Dimensions: Vary by housing type. Verify against the specific 873EC mechanical drawing before cutting a panel.
- Wiring: Power, analog output, alarm relays, and sensor connections are on the rear terminal block.
- Sensor Cable: Use the recommended shielded cable length. Excess cable should not be coiled near power conductors.
- Grounding: Ground the shield at one end only to avoid ground loops.
FAQ
Can I replace 873EC-JIPFGZ with another 873EC unit?
Only if the suffix matches. The letters after 873EC define power, output, enclosure, alarms, and communication. A different suffix may have the wrong voltage or relay rating.What sensor does the 873EC-JIPFGZ use?
It typically pairs with Foxboro 871EC or 871FT toroidal conductivity sensors. Confirm the sensor model and cell factor before calibration.Is this unit still manufactured?
The 873EC series is legacy. Some configurations may still be supported through replacement platforms, but 873EC-JIPFGZ itself should be treated as a discontinued spare.I’m getting a drifting reading after replacing the sensor. Why?
Most often the cell factor or temperature compensation is incorrect. Enter the correct cell factor from the sensor tag, then perform a calibration with a known standard if possible.Does it support HART or digital communication?
Some 873EC units support FOXCOM digital output. HART availability depends on the exact suffix and hardware revision. Check the nameplate and OEM documentation.What power supply does it need?
It depends on the suffix. Some 873EC units run on 100/220 VAC, others on 24 VDC. Applying the wrong voltage can damage the power section. Always verify before energizing.Can you test it before shipping?
Yes. Units can be bench-tested for power-up, display function, output current, and relay operation. Full process calibration requires a compatible sensor and standard solution.
