RKI Instruments GD-K77D User Manual
Page 25
Model GD-K77D
Operator’s Manual
Operation • 20
The basic operation flow and the three operating modes are described in this section of
the manual.
Start Up
Power On
1.
Before turning on the power to the Model GD-K77D, read “Start-up Preparations”
described above.
2.
Remove the front cover of the Model GD-K77D if it is still attached to the Model GD-
K77D. See “Removing the Model GD-K77D Detector Unit” for more information.
3.
The power switch is located on the front panel beneath the alarm lights and above the
flowmeter.
4.
To turn the power on, move the switch to the right. To turn the power off, move the
switch to the left. After the power has been turned on, the PW/TR light turns on and
after several seconds the pump begins working. An initial warm up is performed for
approximately 25 seconds in which the Model GD-K77D’s system is checked. This
system check includes the external output, alarm, and trouble action, and shut-off
(lamp and contact).
Flowmeter Adjustment
1.
Check the flowmeter to make sure the flow ball is between the two red flow lines.
2.
If the flow ball is not between the red flow lines, adjust the air flow. When the flow ball
is above the top flow line, press the FLOW ADJ switch down to reduce the flow rate.
When the flow ball is below the bottom flow line, press the FLOW ADJ switch up to
increase the flow rate.
NOTE:
The flow rate of the Model GD-K77D is 0.5 LPM. When the flow ball drops below the bottom flow line,
the Model GD-K77D cannot accurately detect the target gas. Increase the flow rate.
CAUTION:
Allow the unit to warm-up for 2 hours before setting the zero reading.
Set the Zero Reading
See the Zero Adjustment section below for instructions on how to set the zero.
Detection Mode
Displays
The Model GD-K77D’s Detection Mode uses two types of indications:
•
An LED (light emitting diode) display, which shows the gas concentration
•
LED lamps show:
•
Power/Trouble (PW/TR)
•
Alarm 1 (ALM1)
•
Alarm 2 (ALM2)
•
Skip (SKIP)