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Foxboro 873EC-BIPFGZ Electrodeless Conductivity Analyzer

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 Breakdown & Model Matrix

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

Hardware Specifications

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

4-20 mA HART Loop Protocol & Channel Isolation

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.

Frequently Asked Questions

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.

Field Installation Guidelines

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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