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Teledyne API Ultrafine Particle Monitor - Model 651 Maintenance, Service, and Troubleshooting
07506C DCN6727 89
Problem Cause Suggestions
Home screen displays Inlet
Pressure Fault. Status
screen displays a low inlet
pressure reading (in red).
There is an obstruction in the
aerosol or Model 651 inlet.
1. Check that there are no kinks in the tubing
upstream of the inlet.
2. Check the inlet screen assembly for obstructions.
3. Remove the inlet screen assembly.
4. Remove the elbow joint.
5. Unscrew the black cap.
6. Remove the screen assembly.
Note: Do not lose the O-ring.
7. Blow the screen with compressed air.
8. Reassemble the inlet screen assembly.
9. Replace the inlet screen assembly.
“Temperatures out of
range” error messages are
displayed for the Water
Separator, Optics, Growth
Tube or Conditioner.
Status screen shows
readings in red.
The instrument was flooded.
Environmental temperature or
humidity is too high or too low.
Note: If the instrument was
flooded, you will also see water
in the tubing and high nozzle
pressure readings.
In the event of flooding:
1. Disconnect the water bottle from the WATER
INLET/DRAIN.
2. Run the instrument for 6 to 8 hours to dry it out.
3. When the flow returns to normal, the instrument
is dry.
4. Reconnect the water bottle.
If concentrations do not return to normal, return the
instrument to TAPI for repair.
Status screen indicates
Water Reservoir Not Filled.
There is no water in the
reservoir. The water may not be
connected, the water bottle may
be empty, or the water bottle has
been placed below the level of
the instrument.
Check that the water bottle is filled and connected
correctly. Make sure that the bottle is placed at a higher
level than the instrument to provide for the gravity flow
fill mechanism.
If the problem persists, return the instrument to TAPI for
repair.
Status screen Pulse Height
indicator is too low (in the
red area).
There is no or very low
(<10 #/cm
3
) particle
concentration. At higher
concentrations this indicates: a
dry wick, optical alignment
problems, dirty optics, or flooded
optics.
If the suspected concentration is above 100 #/cm
3
then
replace the wick and make sure water is connected to
the instrument. If all other status indicators are normal,
the optics module must be replaced. Return the
instrument to TAPI for replacement of the optics module
by a qualified service technician.
The real-time clock does
not maintain time when the
instrument is turned off.
The time is not maintained
correctly.
The clock battery needs
replacing.
Replace the clock battery located on the main
electronics board with a BR1225 Panasonic or
equivalent.