LumaSense Technologies ISR 320 - Manual (Page 41)

ISR 320 Manual Troubleshooting 41
9 Troubleshooting
Symptom Probable Cause Comments
No analog output even if the
display shows a temperature
above lower range limit
Reversed leads to ISR 320. The ISR 320 is diode
protected if power leads
are reversed.
See section 3.1
Reversed leads to other instruments in the
current loop.
Open circuit in lines connecting all instruments
in current loop.
Total burden higher than 500 Ohms
Insufficient supply voltage (See wiring
diagram).
Temperature readings are too
low
Target size too small.
Target is not at correct focus distance. See section 3.3 and 5.10
With small target/close
focus models, aiming may
require X-Y positioning
table for fine adjustment
during aiming.
Incorrect alignment of the pyrometer to the
object. Realign pyrometer in
1-channel mode (mono)
to achieve the maximum
temperature signal.
Dirty window or lens. See sections 4.7 and 6.1
Target temperature too low.
Target emissivity much lower than expected. Even 2-Color instruments
depend on actual target
emissivity to supply
sufficient energy to the
sensor.
See sections 4.1, 4.2, 4.3,
4.7, 6.1
Incorrect slope adjustments. See sections 4.2, 5
Faulty ISR 320 Contact LumaSense. See
section 1.5
Temperature readings are too
high Targets hotter than expected. (This often
happens with first time infrared Pyrometer
users). Verify target temperature
with contact type
method.
(Thermocouples may not
accurately determine
surface temperature due
to “heat sink” effect).