|The RSJ-4 loop circuit resistance monitor is used when need to indicate the absence of the loop
circuit resistance and give an alarm. The product has a 4-position switch to choose the operating power. When the load is normal, the normal state indicating lamp would be lighten up, the output contacts 4# and 3# connected ; while the connectors 2# and 1# disconnected. When the loop circuit resistance increased (for example ,because of the heaters aging or one of a heater which belong to a parallel connected heater opened circuit), the normal state indicating lamp would be turned off,while the alarm indicator lamp turned on , simultaneously the output alarm contacting status would be changed. Namely, when the corresponding operating power is absent or falling down to 20%,the accurate action could be make in time. The monitor also can sample the supply voltage and continuously revise the reference voltage value so that can avoid any misoperation when the power supply is fluctuating .This product is especially suitable for monitoring the heaters which are parallel connected .The device has some advantages like connected easily, installed conveniently ,strong ability to resist current impact and so on.