876EC Intelligent Transmitter for Electrodeless Conductivity Measurements with HART Communication Protocol
The Schneider Electric brand Model 876EC is a 2-wire loop powered intelligent transmitter that, when used with appropriate electrochemical sensors, provides measurement, local display, and transmission of electrodeless conductivity. The transmitter outputs a HART digital signal and a 4 to 20 mA analog output.
CONDUCTIVITY AND CONCENTRATION MEASUREMENT
• This transmitter can be configured to measure in conductivity units (μS/m, μS/cm, mS/m, mS/cm, or S/m), or one of a host of chemical concentration units such as percent (%) by weight, grams per liter (g/L), parts per million (ppm), and parts per thousand (ppt). A series of preprogrammed temperature and percent chemical concentration curves are available as a standard feature. User programmable curves may also be used for special applications such as uncommon chemicals, proprietary processes, or nonbinary solutions.
INTRINSICALLY SAFE DESIGN
• The 876EC Transmitter is designed for compliance with FM, CSA, ATEX, and IECEx standards for intrinsically safe and non-incendive apparatus in hazardous area locations.
TEMPERATURE PREDICTION
• For a Foxboro sensor, a proprietary mathematical algorithm is applied to accelerate the sensor’s response to changes in the process temperature. This reduces errors that may appear in the compensated measurements when the process temperature changes rapidly.
SENSOR AND TRANSMITTER DIAGNOSTICS
These functions include View Faults, Suspend Faults, Resume Faults, and View History. Typical faults include:
• Measurement / Compensation / Analog Output Overrange and Underrange
• Calibration Required
• Liquid Leakage into Sensor Body
• ATC Short and ATC Open
features
- • 4 to 20 mA output with a HART digital signal.
- • Temperature prediction
- • Remote configuration/calibration with the HART Communicator or PC-based Configurator.
- • Fault isolation to transmitter or sensor, and continuous transmitter/sensor diagnostics.
- • Temperature compensation and concentration curves.