American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 51)

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4 Operation
4.1 Operational Guidelines
This section describes the front panel display and keypad functions for the
Model 286. In addition to the front panel operation, the remote
communication port provides methods for performing the identical
operations and acquiring the current state of the instrument. Refer to the
Remote Interface section beginning on page 57 for more details regarding
the communication functions.
The Model 286 provides up to four level measurement channels,
designated as 1 through 4. The channels may be assigned to any sensor
input. The sensor inputs are designated as A through D. Please note that
the calibrations are fixed to the sensor input, regardless of how the sensor
inputs are assigned to the channels.
Channels 1 and 2, and the associated switched AC outputs 1 and 2, of the
Model 286 provide the ability to operate in one of three level-control
modes: normal, auto-changeover, or pre-cool.
Channels 3 and 4 do not provide level-control functions, but do provide the
ability to measure liquid level, activate HI, LO, and RATE alarms, and
optionally HI and LO relay contacts available from the rear panel.
4.1.1 Energize the Instrument
After completion of the Installation and Calibration (if necessary)
procedures, energize the instrument by placing the power switch in the
POWER [
I
] position. The backlit LCD display will briefly display the
instrument name and ROM revision, and all LEDs will be energized. The
Model 286 will then begin level and usage measurements and update the
default display as illustrated below:
Press the
OPTION
key in the default display to move the cursor $ and
select any of the four independent channels. While the default display is
active, press the
MENU
key to show the usage rate for the selected
channel. Press the
MENU
key again to return to the multi-channel display.
Figure 4-1. Default display showing levels for
Channels 1 and 2 (in percent).
$Ch 1: 100.0 %
Ch 2: 75.0 %