6564
4-20MA REPEATER EXPANSION CARD
Some PF2100 models come with this card pre-installed.
4-20MA REPEATER EXPANSION CARD SETTINGS
These settings all apply to the 4-20mA Repeater Expansion Card which must be installed in the PF2100’s
expansion slot. These settings can all be found in Menu 6. Some of these settings will be hidden if the
card is not installed or enabled.
4-20 REPEATER EXPANSION CARD ENABLE (MENU 6)
For the Tank Level Settings to be visible, the LVL DIP Switch on the 4-20mA Repeater Card must be
enabled.
Tank Level Settings:
1. 4-20 LEVEL ZERO OFFSET (menu 6): Specifies the offset
value for the tank’s level transmitter.
2. 4-20 LOW LEVEL SETPOINT (menu 6): If the 4-20mA LVL
input drops below this setpoint, the burner will turn off to
prevent damage to the tank and fire tube.
3. 4-20 HIGH LEVEL SETPOINT (menu 6): If the 4-20mA LVL
input exceeds this setpoint, the LVL output contacts on the
4-20mA Input Card will toggle.
4. 4-20 LEVEL RANGE (menu 6): Specifies the maximum
capacity of the tank’s 4-20mA level transmitter.
5. 4-20 LEVEL UNITS (menu 6): Specifies the units of
measurement. Note that this may have an impact on
measurement accuracy.
Fuel Train Pressure Settings
For the Fuel Train Pressure Settings to be visible, the PRS DIP Switch on the 4-20mA Input
Card must be enabled.
1. 4-20 LOW PRESSURE SETPOINT (menu 6): If the 4-20mA
PRS input drops below this setpoint, the burner will turn off to
prevent flame from burning back into the fuel train.
2. 4-20 HIGH PRESSURE SETPOINT (menu 6): If the 4-20mA
PRS input exceeds this setpoint, the system will shut down.
3. 4-20 PRESSURE RANGE (menu 6): Specifies the maximum
capacity of the tank’s 4-20mA Pressure transmitter.
4. 4-20 PRESSURE UNITS (menu 6): Specifies the units
of measurement. Note that this may have an impact on
measurement accuracy.
4-20MA LEVEL INPUT & OUTPUT CONTACTS
The 4-20mA Level Input is used to monitor tank level in the same way as the Level Contact. The behavior
and features are identical to those described in the previous Contact Behavior section. The difference is
that a Level Transmitter is used instead of a Level Switch and the Low Level setpoint is set via a menu
instead of the physical position of the switch on the tank. When the 4-20mA signal is below the Low
Level setpoint, the system will stop. When it is above the setpoint, the system will run.
The 4-20mA Expansion Card also has a pair of High Level Output Contacts which toggle when the Level
Input exceeds the Level High Setpoint. One contact is normally open and the other is normally closed.
“Normally”, in this case, means “when the level is below the high setpoint”. The normally closed contact
could be used to turn off the pump that is filling the tank and the normally open contact could be used to
sound a remote alarm to signal that the tank is full.
To use the 4-20mA Level Input, it must be setup as follows:
1. Attach a properly calibrated Level Transmitter to the 4-20 Level
Input
2. Enable the Level DIP Switch on the 4-20 Card
3. Enable the 4-20 Card in menu 6
4. Set the Level Low Setpoint, High Setpoint, Range, and Units in
menu 6
5. Disable the Level Contact by installing a jumper in it
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