User Manual

21 • Operation Model GD-K77D Operator’s Manu al
Operation Flow
The diagram below shows the operation flow for Detection Mode. In Detection Mode, the
PW/TR light is on and the LED display shows the concentration of the target gas.
Gas Alarm
During an alarm condition, ALM1 will be on if the gas concentration rises above the alarm
1 set point, and ALM2 will be on if the gas concentration rises above the alarm 2 set point.
The LED display will show the concentration of the target gas. The example below
illustrates an alarm 1 condition with a gas concentration of 0.5 ppm.
Start-up preparation
Power on
Initial warm-up (about 25 seconds)
Detection mode
LED lamp function
Light off
Light on
Flashing
PW/TR
ALM1
ALM2 SKIP
PW/TR
ALM1
ALM2 SKIP
LED indication
0.
00
Display indi cation
LED indication
Display indication
0.
5
0
PW/TR
ALM1
ALM2 SKIP