American Magnetics 185 & 186 Liquid Level Instruments (CE-Marked) - Manual (Page 39)

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4 Operation
The Model 185/186 and sensor (if applicable) were functionally tested and
calibrated at the factory. The calibration sticker located on the bottom of
the instrument shows the calibration length, calibration liquid, and
whether an approximate calibration method was utilized at the factory. In
the event that the calibration is incorrect for the application, the
instrument will need to be recalibrated by the user with a specific sensor
and liquid. Refer to the Calibration section for the specific procedures.
4.1 Normal Operations
4.1.1 Energize the instrument
After completion of the Installation procedures, energize the instrument
by placing the power toggle switch in the POWER position. The LED
display will briefly display AAAA and then indicate the liquid level, and the
yellow ACTIVITY LED will begin blinking.
Note
The ACTIVITY LED provides visual indication that the
microprocessor is making sensor readings. If a fault should develop
which prohibits the microprocessor from operating correctly (such as
a break in cabling) the LED will not blink or blink slowly, and the
display will continuously show 100%.
Note
If the displayed level reading is below the LO SETPOINT level or
exceeds the HI SETPOINT, an audible alarm will sound. To silence
the alarm, rotate the control mode rotary switch on the front panel to
the SILENCE position.
The instrument is normally calibrated at the factory for the specific sensor
supplied with the unit for use in a target liquid. If the need arises for
recalibration, see the Calibration section.
4.1.2 Configure the active length setting
After calibration, the instrument must be configured for the active length
of the sensor in order to scale the measurement to meaningful units of
length for display. For a standard calibration, the value of the active
length is the sensor length between the bottom hole to 1 inch below the top
hole of the sensor assembly. If the user performed a calibration, then the