Contacting Conductivity/Resistivity Sensors 871CC

871cc contacting conductivity and resistivity sensors and accessories

Manufactured byfoxboro

Contacting Conductivity/Resistivity 871CC Sensors are used with Foxboro 873CC, 873RS, 873ACC, 873ARS, 875CR, 870ITCR and 876CR Electrochemical Analyzers and Transmitters to detect the conductivity or resistivity of a solution. The analyzer  applies a low frequency voltage or current across the sensor electrodes in contact with the process fluid. The resulting electrical parameter is sampled, interpreted, temperature-corrected, and displayed by the analyzer.

APPLICATION FLEXIBILITY

A choice of two cell factors, 0.1 cm-1 and 10 cm-1, is available for conductivity measurement. The required cell factor is dictated by the measurement type and range. Resistivity measurements always use a sensor having a cell factor of  0.1 cm-1. Conductivity measurements utilize both cell factors. 871CC Sensors are offered with a wide variety of mounting options and a choice of two temperature elements.

QUALITY AND UNIFORMITY

871CC Sensors are manufactured under strict guidelines of quality and uniformity to ensure that all cell factors are within 2% of their nominal value. All sensors with 0.1 cm-1 cell factor (CF) have the actual
CF stamped on the sensor. The actual CF is determined using NIST traceable quality procedures. Optionally, resistivity cell factors can be determined in a Foxboro ultra-pure water loop (Options Code -9). Simply enter the CF and temperature CF into the applicable factory-calibrated analyzer and you have a fully-calibrated measurement system!

INTEGRAL TEMPERATURE SENSOR

All sensors use an integral temperature element whose signal is used by the analyzer for temperature compensation and measurement. Sensors are available with either a 100 kΩ thermistor or 100 Ω RTD. For elevated temperatures, the 100 Ω RTD is recommended. Optimum positioning of these transducers within the sensor ensures close thermal contact with the process and, thus, rapid response to temperature change. Temperature cell factors (tCF) are determined and stamped on each 0.1 cm-1 cell-factor sensor. This factor indicates the offset, in °C, resulting from the resistance of the RTD or thermistor cable. Entering this value into the analyzer or transmitter accurately calibrates the RTD or thermistor to the instrument.

TITANIUM, MONEL AND CARBON ELECTRODES

The 0.1 cm-1 CF sensor is constructed with titanium or Monel™ electrodes. Titanium oxidizes naturally to form a chemically passive but electrically conducting surface. It is compatible with most fluids except acidic fluorides. For applications using acidic fluorides, Monel electrodes can be used. The electrodes have a concentric cylinder configuration. The 10 cm-1 cell-factor sensor uses high density graphite electrodes.

VARIETY OF ACCESSORIES

A large selection of accessories is offered to meet virtually all process requirements. This includes process-mounting accessories such as flow chambers, gate valve assemblies, and tees.

 


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