Alnor APM 150, Owner'S Manual, Page: 18 / 78

14
14
TROUBLESHOOTING
Symptom Probable Cause/Corrective Action
No Display Instrument is not on. Press
ON/OFF
.
Dead batteries. Replace batteries.
Batteries incorrectly installed. Check polarity and
correct if required.
LO BAT
indication on Battery voltage is low. Replace batteries.
Random pattern on display Battery voltage is too low. Replace batteries.
Display does not change or flashes
HOLD/AVE
button was depressed. Press hold again
to release.
Very stable input. Meter could be in another mode
besides
RUN
.
Display shows [ ] Input condition below minimum allowed. See
SPECIFICATION section of manual for limits.
Display shows [ ] Input condition above maximum allowed. See
SPECIFICATION section of manual for limits.
Display shows [ ] Probe or sensor not connected or loose. Check
connection to meter. Tighten connector if required.
Probe or sensor damaged. Call TSI.
HOLD/AVE
button on handle does not work Connector between handle and meter is not plugged
in. Connect hold cable to sensor module.
Measurement is erratic Input is unstable. Interpret value from high and low
display limits or increase time constant setting.
Erroneous readings Wrong measurement units. Verify correct units.
Hood frame not sealing properly around diffuser or
grill. Press hood evenly against diffuser.
Hood torn. Replace or repair hood.
Supply/Exhaust Exhaust mode was incorrectly chosen when
measuring supply flow or vice versa. Check mode.
Display shows “
▲ ” sign for exhaust mode. Absence
of “ ▲ ” indicates supply mode. Use key to select
desired mode.
Note: meter always starts up in supply mode.
Connection between manifold and sensor/meter is
broken. Call TSI.
Manifold is damaged. Call TSI.
Manifold holes are plugged. See Maintenance section
of manual.
Condensation inside sensor module. Allow unit to
warm up to room temperature.
Will not transmit data to computer Make sure the terminal is set properly. The serial port
must be enabled.