239-RTD-AN-H

About the 239-RTD-AN-H

One key difference between the 239-RTD-AN-H Relay and other relays within this series is that while it is still an analog resistance temperature detector or RTD for short, there is a harsh environmental conformal coating that other relay systems do not have. As already mentioned this unit is analog and therefore has an analog output that can be used in correspondence with automated equipment, a programmable controller, and a chart recorder.

The 239-RTD-AN-H can be used for continuous monitoring and can choose from a few different parameters, which include an Average Phase AMPS, Motor Load, and Thermal Capacity. Each phase has a percentage of a full load. Temperature options underneath the RTD1, RTD2, or RTD3 options are also required. The values that are associated with the 239-RTD-AN-H relay can be accessed digitally through the communication interface. 

When using the 239-RTD-AN-H it is wise to know what the connected motor load is so the motor can be adjusted accordingly to prevent the relay from tripping. The analog can be used with a remote meter, which is sold separately and can be calibrated from zero to one hundred percent of the motor capacity being used. This meter should be situated near the operator and connected to the relay. This meter indicates the amount of memory that has been charged corresponding to the heat buildup of the motor. If during operation the meter is approaching a hundred percent capacity it indicates that the relay is on the verge of being tripped. The meter has a lockout time and will indicate how much charge is left in the memory to show how long the lockout may last.