RKI Instruments GD-K77D User Manual
Page 29
Model GD-K77D
Operator’s Manual
Operation • 24
Maintenance Mode Operation Flow
CAUTION:
When Maintenance Mode is entered during a gas alarm, the alarm condition will be cancelled.
The relay contact will be reset and the 4-20 mA output will lock on 2.5 mA.
Zero Adjustment
A zero adjustment resets the Model GD-K77D’s gas detecting system to zero so it can
accurately sample the target gas. This test should be done periodically, such as once a
month. This procedure illustrates how to use the zero function in Maintenance Mode 1. If a
full calibration is being done, use the zero function in Maintenance Mode 2 (see calibration
section).
PW/TR
ALM1
ALM2
SKIP
PW/TR
ALM1
ALM2
SKIP
LED indication
Display indication
PW/TR
ALM1
ALM2
SKIP
PW/TR
ALM1
ALM2
SKIP
Press mode switch for
three seconds
Maintenance mode starts
1-1 Zero Adjustment
1-2 Alarm points
1-3 Maintenance mode 2
FLOW ADJ/select by
▲ ▼
SW
Maintenance Mode 1
FLOW ADJ/select by
▲ ▼
SW
1
1
1
2