GT-324 Manual
Page 19
GT-324-9800 Rev B
In addition to calibration, the annual calibration includes the following preventative
maintenance items to reduce unexpected failures:
Inspect filter
Inspect / clean optical sensor
Inspect pump and tubing
Cycle and test the battery
Verify RH and Temperature measurements
7.3.
Flash Upgrade
Firmware can be field upgraded via the USB port. Binary files and the flash program
must be provided by Met One Instruments.
8.
Troubleshooting
WARNING:
There are no user serviceable components inside this instrument. The
covers on this instrument should not be removed or opened for servicing, calibration or
any other purpose except by a factory-authorized person. To do so may result in
exposure to invisible laser radiation that can eye injury.
The following table covers some common failure symptoms, causes and solutions.
Symptom
Possible Cause
Correction
Low battery message
Low battery
Charge battery 2.5 hrs
System noise message
Contamination
1. Blow clean air into nozzle
(low pressure, do not
connect via tubing)
2. Send to service center
Sensor error message
Sensor failure
Send to service center
Does not turn on, no
display
1. Dead battery
2. Defective Battery
1. Charge battery 2.5 hrs
2. Send to service center
Display turns on but
pump does not
1. Low Battery
2. Defective pump
1. Charge battery 2.5 hrs
2. Send to service center
No counts
1. Pump stopped
2. Laser diode bad
1. Send to service center
2. Send to service center
Low counts
1. Incorrect flow rate
2. Calibration drift
1. Check flow rate
2. Send to service center
High counts
1. Incorrect flow rate
2. Calibration drift
1. Check flow rate
2. Send to service center
Battery pack does not
hold a charge
1. Defective battery pack
2. Defective charger module
1. Send to service center
2. Replace charger
