Perma Pure Modular Board - Manual (Page 8)

temperature rises to 0.5 °C above the ‘Ready’ temperature. This hysteresis is set
to avoid relay chatter when the impinger is near the set temperature.
The unit can be set to have the ‘Water Slip’ input to control the relays in several
ways. The ‘Water Slip’ can;
Control Relay1 in conjunction with ‘Ready’ on channel 1
Control Relay2 in conjunction with ‘Ready’ on channel 2
Control Relay2 alone
Both relays have two sets of contacts. The standard factory wiring uses one set to
operate a sample pump. The second set of contacts is available for field wiring by
the user.
NJ Thermocouple Display
The impinger temperatures are available as a voltage output equal to 0.1 V / °C.
Analog out 1 is controlled by the temperature measured from thermocouple #1.
Analog out 2 is controlled by the temperature measured from thermocouple #2.
Each control board has two field replaceable relays.
Relay 1 is activated when the impinger temperature channel 1 is below the user
set ‘Ready’ temperature. The relay does not deactivate until the impinger
temperature rises to 0.5 °C above the ‘Ready’ temperature. This hysteresis is set
to avoid relay chatter when the impinger is near the set temperature.
Relay 2 is activated when the impinger temperature channel 2 is below the user
set ‘Ready’ temperature. The relay does not deactivate until the impinger
temperature rises to 0.5 °C above the ‘Ready’ temperature. This hysteresis is set
to avoid relay chatter when the impinger is near the set temperature.
The unit can be set to have the ‘Water Slip’ input to control the relays in several
ways. The ‘Water Slip’ can;
Control Relay1 in conjunction with ‘Ready’ on channel 1
Control Relay2 in conjunction with ‘Ready’ on channel 2
Control Relay2 alone
Both relays have two sets of contacts. The standard factory wiring uses one set to
operate a sample pump. The second set of contacts is available for field wiring by
the user.
Switch Inputs
Single Channel Cooler
There are two dry contact inputs for each board labeled External Switches.