Limit-value switch for temperature, input NTC thermistor 1 2 Straightforward application Suitable for severe operating conditions Compact construction Limit value freely adjustable by drum scale Anti-tamper seal for drum scale Meet high EMC-requirements Limit-value switches Volt-free output as change over switch contact Open-circuit or closed-circuit variants available Short circuit monitoring of input signal Broken-wire monitoring of input signal Operating characteristics displayed by integrated LEDs Flame-inhibiting and self-extinguishing body Suitable temperature sensors are available Limit-value switches of series 5 Limit value switches of the series 5 are designed to monitor and process electric measured variables. Working principle: When the actual value of the measuring signal supplied reaches the setpoint, the built-in relay will operate. The switching status of the relay contact may, for instance, be monitored or individually processed by a machine controller. General notes on Type RH5.. Description RH5.. The Type RH5.. is designed for the temperature monitoring with NTC (negative temperature coefficient) thermistors whose resistance decreases as the temperature is increased. Basically, any NTC-ther- in regular operation. In the case of a wire break occurring in the sensor, the maximum value of the sensor signal will be exceeded, causing the relay mistor sensor can be used that possesses a characteristic that of NORIS sensors is recommend- ate, the red LED lights up just like when the limit value is exceeded the limit-value switches. Settings failure, the green LED will be flashing to signal a broken-wire condition. ed because they are matched to output to operate and the red LED to light up. To identify sensor of the limit value are made at the short top side of the switch by means of a drum scale. The scale is graduated in degrees Celsius to suit the specific measuring range of 40 ... 120 °C or 5 ... 70 °C. Any value on the drum scale can be selected as the limit value. Volt-free relay contact, closed-circuit or open-circuit version A volt-free relay contact is provided as a change over switch contact for outputting and further processing. In addition, there is a choice between closed-circuit and open-circuit devices. In the case of closed-circuit devices, the output relay is pulled up in the normal state of operation with the supply voltage applied. It drops off upon the limit-value being exceeded or if the supply volt- age fails. In the open-circuit variant, the output relay pulls up when the limit-value is exceeded with the supply voltage applied. Failure of the Monitoring for short circuit and circuit integrity voltage will not result in any switching function below the limit value. The RH5.. type series comes equipped for monitoring sensors for short circuits and integrity. In the event of a short circuit, the maximum limit value is exceeded

Other Data Series RH5.. Relay position Type key / variants RH5..-A Input range: x = contact closed - = contact open The red LED is illuminated, if the limit value is exceeded R Limit-value switch Input signal H |NTC resistance Type series 5 Type 5