American Magnetics 185 & 186 Liquid Level Instruments (CE-Marked) - Manual (Page 40)

30 Rev. 3
Operation
HI/LO setpoints
physical distance between the locations of the MIN and MAX calibration
points on the sensor is the active length.
The instrument allows the user to display the liquid level in units of length
(inches or centimeters) in addition to a percentage. The instrument was
shipped with the length value set to the active sensor length if a sensor
was purchased with the instrument.
To view the present length setting, place the units mode toggle switch in
either the INCH or CM position. Place the control mode rotary switch on
the front panel to the LENGTH position. Push and release the RAISE/
LOWER toggle switch either up or down. The display will momentarily
show the current length setting.
To change the length setting, use the RAISE/LOWER toggle switch to
move the setting up or down by continuously holding it in the up or down
position. The display will move slowly at first and then faster. Once near
the desired value, simply release the switch momentarily and then resume
changing the setpoint at the slower speed. The new active sensor length is
permanently stored in memory. Check the value by momentarily placing
the toggle switch in either position from the center position.
Note
The LENGTH adjustment can only be performed in the INCH or
CM units modes. The LENGTH adjustment is inactive if the units
are set for %.
4.1.3 Configure the HI SETPOINT and the LO SETPOINT
To adjust the HI and LO setpoints, place the control mode rotary switch in
the HI SETPOINT position or the LO SETPOINT position, respectively.
Use the RAISE/LOWER toggle switch to adjust the respective setpoint in
the same manner as described for the LENGTH adjustment in step 2. The
setpoints may be located anywhere between 0% to 100% of the active
sensor length. The HI and LO setpoint adjustments are compatible with
all three units modes.
a. When the measured liquid level exceeds the HI setpoint, the HI
LEVEL LED on the front panel is energized and a set of relay
contacts are closed on the 9-pin D connector J2 on the rear
panel (see the Appendix for the pinout). When the level reaches
or falls below the HI setpoint, the LED is extinguished and the
relay contacts open.
b. When the measured liquid level falls below the LO setpoint, the
LO LEVEL LED on the front panel is energized and a set of
relay contacts are closed on the 9-pin D connector J2 on the rear
panel (see the Appendix for the pinout). When the level reaches