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4100-HCF2
Revision 3.0
P a g e 9 | 35
Main Panel
The main panel is a wall mounted touch screen monitor to be installed in a general purpose (non-
hazardous) location that is accessible for set-up and observation of the display and alarms.
Four relays are available. Relay 1 can be field set to alarm at any depth of oil within the range of the
sensor. Relay 2 is factory set as an Air alarm (Dry condition). Relay 3 is factory set as a system fault
relay. Relay 4 can be set as a (1) general purpose oil alarm (factory default), (2) Pump Run relay with a
timed and auto shut-off feature or (3) level sensor mA input alarm. Relay 2 and 3 can also be selected
to act as Oil Alarm relays. See section 7.2 for instruction to change alarm setup.
A 4-20 mA non-isolated output and Modbus RS-485 are optional. The power input at the main panel
serves the HMI, PLC, and sensor requirements.
An optional Buzzer and strobe (beacon) are available.
The float may be made Intrinsically Safe for Hazardous Classified locations through the installation of an
IS Barrier in the main panel.
The main panel screen provides additional user interface menus for diagnostics, analog output,
calibration, set-up and general help information. Diagnostic Menus can be accessed for viewing at any
time but a passcode entry is required to make setup changes.
Remote Panel
Remote panels are available to mimic the screen and audio/visual alarms of the main panel. All access
to the touch screen menus are password protected on the remote panels.
Sensing float
An Arjay PMC card is potted within the sensor. This converts the capacitance reading of the oil
thickness into a frequency pulse for transmission to the main panel. This unique approach eliminates
any operator interface requirements at the sensor. All diagnostics and calibration is done at the main
panel.
The sensor floats on the surface of the changing water level and is tuned to the capacitance field below
it. When oil separates to the surface, the capacitance reading deceases.
The premise of this stable and reliable technology is that the sensor is continuously floating. In
applications where the well or sump may go dry, the water is displaced with air rather than oil. This will
indicate as an oil condition until the water has lowered enough to initiate the Air alarm. In such
applications, a separate low level switch may be considered to alert operations or lock out an oil alarm
that is caused by air displacing the water rather than oil.
External Level Sensor input
A display of the overall level of the sump or tank is provided as an option. This would require a 4-20mA
input from an external level sensor. Relay 4 can be enabled as a level sensor alarm.