# CHART 2 EVENTS
1 System already running with Low Pressure contact closed.
2 Low Pressure contact opens, timer begins counting down.
3 Timer expires, system waits for Low Pressure contact to close.
4 Low Pressure contact closes, system starts running again.
HIGH PRESSURE INPUT
The High Pressure Input Contact is used to monitor fuel train pressure when excess fuel pressure may
result in damage to the pilot nozzle or otherwise cause improper operation. A high pressure switch can
be installed on the fuel train and then connected to the High Pressure Input Contact on the PF2100. If the
fuel pressure increases above the switch’s mechanically set pressure setting, the switch opens and the
PF2100 will close all valves and stop running. The system always shuts down from a High Pressure Event
and cannot be programmed to automatically restart if the event clears.
The system cannot be started when the High Pressure Contact is open. The response to the contact
opening is always immediate and cannot be configured.
If this contact is not needed, it must be shorted out with the provided jumper or a wire.
5 | EXPANSION CARDS
5.1 | 4-20mA Repeater Expansion Card
An optional 4-20mA Repeater Expansion Card can be installed in the PF2100 which provides 4-20mA
inputs for level and pressure, 2 dry level contacts and a 4-20mA output which mirrors the input 4-20mA
level signal.
4-20MA FUEL TRAIN PRESSURE MEASUREMENT
This card can be used as an alternative to the High and Low Pressure Contacts which are built into the
PF2100. This input can be wired to a 4-20mA Pressure Transmitter to obtain an actual reading of the fuel
train pressure. The transmitter range and units can be set along with low and high pressure thresholds.
The reading can be displayed on the PF2100 display or read remotely via Modbus if either the optional
Modbus Expansion Card or the Data logging Expansion Card is also installed.
4-20MA TANK LEVEL MEASUREMENT
This can be used as an alternative to the Level Contact which is built into the PF2100. This input can be
wired to a 4-20mA Level Transmitter to obtain an actual reading of the tank level. The transmitter range
and units can be set along with low and high level thresholds. The reading can be displayed on the
PF2100 display or read remotely via Modbus if either the optional Modbus Expansion Card or the Data
Logging Expansion Card is also installed.
TANK HIGH LEVEL DRY CONTACTS
Both Normally Open (NO) and Normally Closed (NC) contacts are provided. When the Level reading is
above the High Level Setpoint, the NO contact will close and the NC contact will open. The opposite is
true whenever the Level reading is below the High Level Setpoint. This can be used to control auxiliary
equipment such as a warning light, an alarm, or the pump that is filling the tank.
Refer to the “4-20mA Repeater Expansion Card Manual” for details on installation and operation of this
card.
4-20MA LEVEL OUTPUT
This output can be wired to a PLC to monitor tank level remotely. The output echoes the signal applied to
the 4-20mA level input contacts.
If the 4-20mA level output is not required, it must be shorted out with the provided jumper or a wire.
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