Auto Calibration; Set Up Sensitivity For Water Detection - Liebert Liqui-tect MC68HC16Z1 User Manual

6.3.4

Auto Calibration

The auto calibration feature is designed to allow compensation for the
resistance tolerances in the two legs of the sensing wires.
As soon as cable is connected, the panel begins calculating the cable
length. Initiating the auto calibration feature allows the user to mod-
ify the distance to account for any discrepancies. Once the new dis-
tance is entered, the panel adjusts for the required offset between the
calculated value and the user value.
To initiate automatic calibration for ZN1:
• From the Setup Zone 1 Menu, choose Auto Calibrate, as shown
at right, and press Enter .
• At the Change Maximum Length screen, you may change the
maximum length of cable protecting this zone:
• To begin calibration without changing this value, press
Enter .
• To change the value, press and hold one of the arrow keys
to scroll through the numbers, then press Enter .
• The next screen displays the progress of calibration.
6.3.5

Set Up Sensitivity for Water Detection

Each zone may be set up with a sensitivity level at which water is
detected.
• The most sensitive setting is 25 µA—minimal water is required to
trigger an alarm.
• The least sensitive setting is 300 µA. At this setting, the cable will
be submerged in water for a longer period before an alarm is trig-
gered.
To change the setting:
• From the Setup Zone 1 Menu, choose Water Detect, as shown at
right, and press Enter .
• The Water Detection Sensitivity screen displays the value for
detection of water (in the example at right,
resents µA or microAmps):
• To change the value, press and hold one of the arrow keys
to scroll through the numbers 25-300.
• Press Enter .
, where UA rep-
150 UA
27
System and Control Options
Setup Zone 1 Menu
SETUP ZN1 ZONE 1
CONNECTED: Y
LABEL: ZONE 1
=NEXT =SELECT
UNITS: FT
> AUTO CALIBRATE
WATER DETECT:150 UA
CONTAMINATED:050 UA
Change Maximum Length
CHANGE MAX LENGTH
1000 FT
=SELECT =ACCEPT
Auto Calibration Progress
THIS SCREEN WILL SHOW
AUTO CALIBRATION
TAKING PLACE
Setup Zone 1 Menu
SETUP ZN1 ZONE 1
CONNECTED: Y
LABEL: ZONE 1
=NEXT =SELECT
UNITS: FT
AUTO CALIBRATE
> WATER DETECT:150 UA
CONTAMINATED:050 UA
Water Detection
Sensitivity
CHANGE SENSITIVITY
FOR WATER DETECT
150 UA
=SELECT =END