Temperature monitors take setpoint relays onboard
An
Amalgamated Instrument product story
Edited by the Engineeringtalk editorial team
Nov 7, 2006
Latching setpoint relays are now available on the panel mount temperature monitors available from Amalgamated Instrument Co.
Latching setpoint relays are now available on the panel mount temperature monitors available from Amalgamated Instrument Co.
The latching function prevents a process recommencing once a fault is removed without explicit intervention by an operator.
An example is a heating application.
The temperature may rise to a dangerous level such that a setpoint relay will operate and cut power.
It is important that the cause of the failure be investigated and rectified before power is restored.
Non latching relays will reset as soon as the temperature drops.
Relays set to "latch" will require operator intervention to reset the relay once the alarm condition has ceased.
Panel mount monitors with the relay latching feature include the PM4-RT8 multichannel RTD temperature monitor.
Up to four channels of three-wire RTD or eight channels of two-wire RTD sensors can be installed.
Up to four setpoint relays can be installed (one is standard) and these can be individually configured as latching or nonlatching.
The PM4-TCR single channel universal temperature monitor accepts RTD, thermocouple or 4-20mA input.
Up to seven setpoint relays can be installed (one is standard).
Again, these relays can be individually configured as latching or nonlatching.
All the relay functions are easily configured by the user and no special test or set-up equipment is required.
The PM4-RT8 and PM4-TCR are available with a wide range of displays.
The very popular five-digit display features four alarm annunciator LEDs that will give information about the condition of relays 1-4.
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