RKI Instruments GD-K77D User Manual
Page 43
Model GD-K77D
Operator’s Manual
Troubleshooting • 38
PW/TR Lamp Off
•
Check the power switch. Is it turned on?
•
Check power connection and re-connect if necessary.
•
Check fuse for proper connection and replace fuse if burned out.
•
Check the power voltage to the Model GD-K77D. Is the voltage normal?
Abnormal Performance
A sudden surge of line noise may be the source of the problem. Try turning off the Model
GD-K77D, then turning the unit back on.
Prevention and Remedies
•
Do not power the Model GD-K77D with a circuit that has a load or with high frequency
noise.
•
Do not install the Model GD-K77D in areas with high levels of radio interference or
electronic noise. This electronic interference may cause abnormal readings.
•
In some circumstances, the Model GD-K77D may be affected by static electricity or
electromagnetic interference. If the environment in which the Model GD-K77D is to be
placed has these electrical hazards, take appropriate steps to shield the Model GD-
K77D properly.
•
Do not place the Model GD-K77D near electrical wiring or other electrical devices,
such as industrial motors.
•
If the noise problem persists, try moving the Model GD-K77D to a new location, away
from electrical devices and cables, and use a line filter to eliminate any line noise.
•
Also note that noise can be caused by lightning.
Unable to Calibrate
•
Is the calibration gas concentration appropriate?
•
The sensor sensitivity may be too low because of age. You may need to replace the
gas sensor.
Slow Response
•
Check the flowmeter to make sure the flow ball is between the two red flow lines. The
flow rate of the Model GD-K77D is 500 L/min. If the flow ball is not between the red
flow lines, adjust the flow rate. 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. When the
flow ball drops below the bottom flow line, the Model GD-K77D cannot accurately
detect the target gas.
•
The dust filter may be clogged. If the flow ball in the flowmeter drops below the bottom
flow line, and increasing the flow rate by pressing up on the flow toggle switch does
not raise the flow ball, the filter may be clogged and requires replacement. Examine
the dust filter; clean or replace it as required.