RKI Instruments GD-K77D - 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