16
Troubleshooting
Symptom Check
DISPLAY SHOWS [
]
The measured value is beyond the
instrument’s range. Be sure there is
no applied pressure, then press
ZERO.
DISPLAY SHOWS
The internal connection between the
meter and [
] the sensor is
faulty. Turn the meter off, then turn
it back on again.
DISPLAY DOES NOT CHANGE
Press the ON/OFF key until the unit
turns off. Then turn it on and try
again.
Your input might simply be very
stable. Test your meter by pinching
the hoses.
METER TURNS OFF
The batteries are too low for your
completing start-up meter start.
Watch for the [
] cycle
indication just before the meter turns
off, then replace the batteries.
MEASURENENT IS ERRATIC
The input is not steady.
Check to see that your Pitot-static
probe is held steady.
ERRONEOUS READINGS
Make sure that your Pitot-static
probe is perpendicular to the air flow
you are measuring.
Clean your Pitot-static probe—it
may be dirty.
Take measurements at a different
location.
If any of these problems persist, call TSI for assistance.
Appendix D: Correction Factors for Non-
Standard Conditions
The AXD530 is a differential pressure instrument. When it is
connected to a Pitot-static probe, it can be used to measure velocity.
When a Bernoulli’s equation is applied to the Pitot-static probe, the
resultant equation has the form V(ft/min) = 4005 [P(in H
2
O)]
1/2
when
