RKI Instruments GD-K77D User Manual
Page 32
27 • Operation
Model GD-K77D
Operator’s Manual
4.
To return to Maintenance Mode item 1-1, press and release the Mode switch. To
return to Detection Mode, press and hold the Mode switch for three seconds.
CAUTION: The gas alarms will only work in Detection Mode. If the Model GD-K77D is
left in Maintenance Mode for ten hours or more, it will switch to Detection
Mode automatically.
Maintenance Mode Summary
Mode No.
Set Item
Purpose
1 - 1
Zero adjustment
This zero adjustment is
done when unit calibration
is not required.
1 - 2
Alarm point check
Used to confirm alarm
points of unit.
1 - 3
Maintenance check
mode
Used to put unit in Mainte-
nance Mode 2.
2 - 1
Check bias voltage
This is an optional test.
The bias voltage is set at
the factory.
2 - 2
Zero adjustment
Used when calibrating the
unit.
2 - 3
Span adjustment
Used when calibrating the
unit.
2 - 4
Sensor start-up
time
Used when new sensor is
installed.
LED indication
Display indication
PW/TR
ALM1
ALM2
SKIP
0.
0
0