LumaSense Technologies M67 - Manual (Page 42)

M67, M67S Manual
41
Target moves partially out of field of
view. Conveyor type applications will
cause fluctuations as target passes by the
field of view.
Application may require “Peak
Picker”. Consult LumaSense.
Target may be changing temperature
rapidly (Thermocouple does not respond
as fast as the Infraducer).
Speed of response can be slowed
down to maximum of 10 seconds
for 95% of reading.
Loose connection in wiring.
Electrical noise in lead wires caused by
intense magnetic fields. Improper
selection of inter-connecting cable.
Cable run in same conduit as AC power
lines.
See Section 8
Improper grounding of cable shield
and/or Infraducer housing and other
instrument on same current loop.
See Section 8
Flame or reflection of flame may be
entering the field of view.
Long sight tube may be needed.
Block reflection with shield.
Steam, smoke, thick dust, Personnel,
moving machinery intermittently
blocking optical path of the Infraducer.
Non-uniform emissivity of large,
moving targets.
Slower response is required.
Emissivity setting too low. Do not set
below 10%. With low emissivity targets,
minute reflections can cause
interference. Remember 10% emissivity
means 90% reflection.
Shield response speed is required.
Slower response speed required
for “average” reading.
Loose connection inside Infraducer. Open from rear and inspect for
loose or broken wires.
Faulty Instrument. Consult LumaSense.
Slow fluctuations from very
low to very high readings.
Ambient temperature of Infraducer
changing too fast for compensating
network.
Insulate Infraducer from ambient
temperature changes. Use plain or
water cooled jacket.
Coolant to cooling jacket was just
turned on or off. Coolant temperature
varies too much to be reliable. Coolant
flow not constant.
Allow 1 hour for stabilization
after coolant flow begins. Assure
constant flow 24 hours a day.
Insufficient warm-up time (for
electronics).
Allow 1/2 hour for stabilization.
Infraducer housing has just been
installed for 10 minutes or longer.
Infraducer temperature changing
too fast for compensating network
to keep up after holding in hands.
Allow 1/2 hour for stabilization.
Reflected energy may be entering
Infraducer.
See 6.4
Lens or window clouding up (coolant
below air dew point temperature).
Increase air purge rate and/or
check air dew point and coolant
temperature. Ensure air is dry.