8
Press felts only:
The caliper must be measured within the sheet's run, preferably
close after the press nip, before any showers or felt conditioning
(see chapter: Interpretation of the results).
5.2 Measuring procedure
Note: For press felts the measurement is only of value when the felt
has been running for at least 1 hour under a steady press load!
1. Switch the instrument on by pushing the (ⱷ, set zero)
button shortly.
2. Check if the display reads "0.00 mm" with closed and clean probes.
Set zero by pushing the (ⱷ, set zero) button more than 2 seconds.
When the display shows "set zero", release the button.
Note: Due to temperature differences the zero may shift.
Check the zero setting before each measurement.
3. Open the mouth of the instrument by pulling the trigger
and move the instrument into the running fabric or felt.
Do not let the inner corner of the instruments
mouth touch the edge of the fabric or felt!
Keep the instrument perpendicular to the
fabric or felt and release the trigger quietly.
4. Slightly push the instrument upward to make
sure that the probe has free movement.
After 2 seconds a stable result is achieved.
5. Pushing the trigger will start the red indicator
LED flashing and the recording of the test
results into the next available memory position.