PF2100 4-20mA Input Card User Manual v1.2
©2021 Profire Energy Inc
June 2, 2021
Page 3
“
Level
” Current Loop
The “Level” Current Loop
is designed to control a pump and heater system that pumps liquid into a heated tank. The 4-20 input card will sense the level of liquid
in the tank and shut off the pump when it is full. It will also de-energize all valves if the tank is empty to prevent damage to the tank.
The level can be displayed on the PF2100 control panel and can be read remotely over Modbus using a Modbus Expansion card (sold separately).
A normally open status contact and a normally closed status contact are provided for use as a high level shutoff for the pump and/or to control external alarm
circuitry.
A software selectable low and high setpoint can be programmed into the PF2100. The PF2100 will de-energize all valves if the level drops below the low level
threshold. Exceeding the high level threshold will toggle the status contacts but will not shutdown or otherwise affect the operation of the burner control
system.
Three LEDs are also provided on the card to indicate if the 4-20mA Level loop is connected, if the level is below the low setpoint, and if the level is above the high
setpoint.
“Pressure” Current Loop
The “Pressure” Current Loop
allows the main valve train pressure to be monitored. If the pressure is lower than the low threshold or higher than the high
threshold, the system will de-energize all valves. The PF2100 can also be configured to control the main valves based on the low-pressure input. Three LEDs are
also provided on the card to indicate if the 4-20mA pressure loop is connected, if the pressure is below the low setpoint, and if the pressure is above the high
setpoint.
“Auxiliary” Current Loop
This input is not currently supported by any firmware revision.
