ZET 7X21 TROUBLESHOOTING

Methods for testing the ZET 7021 and ZET 7121 measuring units:

Двухпроводная схема подключения термосопротивления

Two-wire thermistor connection circuit

 

Трехпроводная схема подключения термосопротивления
Three-wire thermistor connection circuit

With the thermistor disconnected, use an amperemeter or a multimeter in the current measuring mode to check the current between terminals 1 and 3, it should be close to 1 mA.

Check the resistance of the disconnected thermocouple: at ambient temperature it should be close to the NSC (nominal static characteristics) of the thermistor marking.

With the thermistor connected, check the current between terminals 1 and 3, it should be < 1 mA and have a value other than zero.

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