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The MCR-SPP is a primary or redundant industrial process control alarm. The MCR-SPP module features a loop powered threshold monitoring circuit with a bi-stable relay, LED indication of relay status, configurable hysteresis function and relay action. Setting of the threshold is accomplished by a 20-turn potentiometer, while the configurable functions are set by movable jumper settings.
The loop connections are made on the input side of the module through pluggable terminal blocks featuring proven wire clamping technology. Inputs and outputs are physically segregated to opposite sides of the module to ensure correct connection of the inputs and outputs. Relay connections are also made through pluggable terminal blocks.
Hysteresis may be set to 0.1 mA or 1.0 mA, depending upon the application. A 0.1 mA setting allows higher precision response for slowly varying signals, while the 1.0 mA setting is useful for applications where the signal has significant overshoot and undershoot (such as tank levels with unstable liquids.)
Relay function may be set in one of two modes: latching or non-latching. Latching mode engages the relay when the input signal crosses the setpoint threshold, and prevents the relay from releasing when the signal drops below the setpoint threshold. A 'RESET' button on the top of the module is used to release the relay. Non-latching mode allows the relay to release when the signal drops below the setpoint threshold and hysteresis level.
A combination of through hole and surface mount technology provides stable, low drift performance, even in harsh industrial environments. Rhodium-plated contacts ensure low contact resistance even when low-level signals are switched, while levels of up to 1 A and 125 Vac are also accommodated.
MCR-SPP modules snap onto standard 35 mm flat DIN-rail.
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