TSI Instruments 9555 Series, Operation And Service Manual, Page: 15 / 22

11
Chapter 5
Troubleshooting
Table 5-1 lists the symptoms, possible causes, and recommended solutions
for common problems encountered with the Model 9555. If your symptom is
not listed, or if none of the solutions solves your problem, please contact
TSI.
Table 5-1: Troubleshooting the Model 9555
Symptom Possible Causes Corrective Action
No Display Unit not turned on Switch unit on.
Low or dead batteries Replace batteries or plug
in AC adapter.
Dirty battery contacts Clean the battery
contacts.
Velocity reading
fluctuates unstable Fluctuating flow Reposition probe in
less-turbulent flow or use
longer time constant.
No response to
keypad Keypad locked out Unlock keypad by
pressing
ST
keys
simultaneously.
Instrument Error
message appears Memory is full Download data if desired,
then DELETE ALL
memory.
Fault in instrument Factory service required
on instrument.
Probe Error
message appears Fault in probe Factory service required
on probe.
WARNING
!
Remove the probe from excessive temperature immediately:
excessive heat can damage the sensor. Operating temperature limits
can be found in
Appendix A, Specifications . The pressure sensor is
protected from damage up to 7 psi (48 kPa or 360 mmHg). At higher
pressure it can burst!