Configured for precise electrodeless conductivity and chemical concentration monitoring, the Foxboro 873EC-BIPFGZ (873EC Electrochemical Analyzer) provides direct physical/electrical execution. The instrument interfaces with toroidal coil sensors to perform non-contact inductive measurement on corrosive, viscous, or electrolyte fluids, outputting digitised 4-20 mA current loops and isolated 0-10 VDC signals to distributed control architecture.
| Suffix Code | Option Code | Description / Structural Specification |
|---|---|---|
| 873EC | - | Base Electrodeless Conductivity Analyzer |
| -B | - | Plastic enclosure material specification |
| I | - | 24 VDC power supply voltage configuration |
| P | - | Panel-mounted enclosure profile configuration |
| F | - | FM safety approval certification class |
| G | - | General industrial field wiring connection options |
| Z | - | Standard field configuration / factory default revision |
| Parameter | Specification |
|---|---|
| Model | 873EC-BIPFGZ |
| Brand | Foxboro |
| Origin | USA |
| Weight | Standard unit frame (1.5 to 2.5 kg depending on casing) |
| Dimensions | Standard Foxboro panel mount housing (96 mm x 96 mm x 190 mm) |
| Operating Temp | -40 to 70 deg C |
| Power Consumption | 10.2 W |
| Measurement Type | Electrodeless (inductive) conductivity |
| Primary Measurement Accuracy | +/-0.5% of upper range limit |
| Signal Outputs | 4-20 mA isolated, 0-10 VDC isolated, 0-20 mA isolated |
| Temperature Measurement Range | -17 to 199 deg C (with RTD); -17 to 121 deg C (with thermistor) |
| Operating Power Supply | 24 VDC nominal |
| Shock Resistance | 10 g, 1/2 sine wave for 11 ms |
| Vibration Resistance | 1 mm peak-to-peak (2 to 13.2 Hz); 0.7 g (13.2 to 150 Hz) |
| Humidity Range | 5% to 95% RH, non-condensing |
The 873EC-BIPFGZ incorporates channel-to-channel isolation on analog output stages to prevent ground loops from corrupting measurement values transmitted to central process automation hardware. The output conditioning circuitry supports 4-20 mA HART loop protocol connectivity for real-time extraction of primary variables, sensor drive diagnostics, and fluid temperature readings. Integrated cold junction compensation (CJC) and precise RTD/thermistor curve linearisation execute continuously inside the signal processor stage, ensuring dynamic temperature correction over fluctuating process conditions.
Q: How does the electrodeless measurement principle impact field maintenance?
A: Toroidal inductive coils inside compatible sensors generate alternating magnetic fields in the fluid, eliminating direct metal-to-solution contact. This prevents electrode polarisation, fouling, and chemical attack, reducing routine physical cleaning requirements.
Q: Can the 873EC-BIPFGZ run directly on AC utility power?
A: No. The 873EC-BIPFGZ variant specifies a 24 VDC power supply input module requirement, consuming approximately 10.2 W during active sensor excitation and loop driving.
Q: How should temperature compensation elements be wired to the instrument?
A: The analyzer supports two-wire or three-wire RTD inputs along with standard thermistors. Wiring must connect to designated temperature terminals to allow internal compensation algorithms to offset fluid conductivity changes.
Mount the 873EC-BIPFGZ panel cutout securely using the supplied hardware clamps, verifying that the front panel gasket achieves a complete dust and moisture seal. Ground the instrument housing directly to the main cabinet ground bus bar via a low-impedance copper wire. Shielded twisted-pair cables must be utilized for both inductive sensor connections and 4-20 mA output loops. Terminate cable shields at a single point on the control system ground bus to mitigate ground loop noise. Maintain proper separation between low-voltage analog signal cables and high-voltage AC lines within routing ducts.
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