LumaSense Technologies M67 - Manual (Page 41)

M67, M67S Manual
40
12. Troubleshooting
SYMPTOM POSSIBLE CAUSES COMMENTS
No output, (Not even 4mA) Reversed leads to Infraducer. Reversed
leads to other instruments in current
loop.
M67S indicator light is off.
Less than 4mA, greater than 0
mA.
Insufficient supply, voltage. See wiring
section.
Too many instruments on current loop
for capacity of supply.
See Section 8
Low temperature readings or
always reads 4 mA regardless
of target.
Target size too small. Check sighting with M67S or
FOV specification.
Dirty window or lens. See Section 11.1
Optical path obstructed. Clear obstruction or choose
alternative sight path.
Target temperature too low. Read Section 9 on emissivity.
Chapter 9.0.
Target emissivity much lower than
expected.
Target is not at correct focus distance.
(Especially critical with close focus
models)
With small target/close focus
models, aiming may require X-Y
positioning table for fine
adjustments.
May be attempting to view through
window or port made of material that
will not pass infrared radiation of
wavelength "seen" by the Infraducer.
Consult LumaSense.
Faulty Instrument. Consult LumaSense.
Incorrect spectral response for
application. Infraducer may be "seeing"
through target.
Consult LumaSense for analysis.
Moisture condensation on optical
components.
Raise coolant temperature. See
Figure 12
Target hotter than expected. (This often
happens with first time infrared
thermometer users)
Verify target temperature with
contact type method. (Keep in
mind thermocouples may not
accurately determine surface
temperatures due to "heat-sink"
effects).
Emissivity of a target is higher than
expected.
Read Section 9 on emissivity.
Target size too small to fill field of view
and hot background is influencing
readings.
See Section 6.3
If target emissivity is less than 99,
reflection from nearby hot objects
influencing readings.
Block reflection paths to see if
readings drop to expected
temperature.
Improper aiming angle. Long sight tube may be required
(Consult factory).
Aim away from source of heat.
Higher than expected
temperature readings.
Electrical noise in lead wires caused by:
1. Intense magnetic fields.
2. Improper selection of inter-
connecting cable.
3. Cable run in same conduit as AC
power lines.
See Section 8
Improper grounding of cable shield
and/or Infraducer housing, or cooling
jacket.
See Section 8
Noisy readings (rapid
fluctuations).
Infraducer mounting not secure.