American Magnetics 185 & 186 Liquid Level Instruments (CE-Marked) - Manual (Page 42)

32 Rev. 3
Operation
Controller output modes
4.1.5 Select the operational mode of the controller output receptacle
The operation of the CONTROLLER OUTPUT receptacle of the
instrument is controlled by the fill toggle switch. Operation of the fill
toggle switch is as follows:
a. CLOSED (or OFF): With the instrument power on and the fill
switch in the CLOSED position, the instrument serves only as a
level monitor, giving a level reading on the digital display and
providing data via any analog or communication options
installed. All four setpoint LEDs (and associated J2 connector
relay contacts) operate normally, however, the controller output
receptacle on the rear panel will always be de-energized.
b. OPEN (or ON): With the fill switch in the OPEN position, the
rear panel CONTROLLER OUTPUT receptacle will become
energized, thereby initiating flow if the solenoid-operated fill
valve is properly connected. The FILL LED on the front panel
will light indicating the presence of power at the controller
output receptacle. The operator is solely responsible for
terminating the fill flow.
c. AUTO: With the fill switch in the AUTO position, the
instrument is capable of automatically initiating and
terminating liquid fill via the control valve, thereby
maintaining the level between the selected A and B setpoints. If
the liquid level falls below the B setpoint, the rear panel
CONTROLLER OUTPUT receptacle and front panel FILL LED
are energized. When the liquid level subsequently reaches or
exceeds the A setpoint, the controller output receptacle is de-
energized and the FILL LED is extinguished.
4.1.6 Configure the INTERVAL setting (fill timer) if desired
An INTERVAL time-out of up to 600 minutes is provided to alleviate the
possibility of liquid overflow. The time-out feature is enabled when the
instrument is operated in the AUTO mode with an INTERVAL setting > 0.
Once the liquid level falls below the B setpoint, an internal fill timer
(whose period is the INTERVAL setting) begins to count down. If the
liquid level does not reach the A setpoint before the timer expires, the
display will flash rapidly and power to the rear panel CONTROLLER
OUTPUT receptacle will be interrupted. To reset this function the fill
toggle switch must be momentarily placed in the ON position (to complete
the filling process manually) or power to the instrument must be
momentarily turned off.
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