Primes PMT 01 - Cool the Absorber in Water for Series Measurements; Possible Errors

35,0(6
PocketMonitorPMT
30
Revision 01/2020 EN
12.5 Cool the absorber in water for series measurements
The absorber can remain hot for a long time after a measurement. You can prepare the
absorber for the next measurement by immersing it in cold water. Proceed as follows:
1. Grip the unit by the absorber handle, the operating unit or the swivel joint.
2. Immerse the absorber in cold water.
• Do not immerse the operating unit and the swivel joint in water.
3. Observe the temperature display. Remove the absorber from the water as soon as
it has cooled down to room temperature (±5°C).
4. Dry the absorber with compressed air.
• After cooling with water, the absorber must be completely dry. Evaporating water
would falsify the measurement result due to its high heat capacity.
12.6 Possible errors
Error Possible cause
Measured values are lower than ex-
pected.
• The absorber is damp.
• The absorber is placed in a strong air flow.
• The absorber stands on a heat dissipating
base.
• The absorber was moved during the
measurement.
Measured values are higher than ex-
pected.
• The irradiation time set on the device and
the actual irradiation time by the laser are
different.
The display shows 100W instead of
3000W (expected value).
• The the TEMP button was accidentally
pressed after the measurement. Now the
temperature is displayed, usually about 70°C
to 120°C.
Tab. 12.4: Possible errors