(2) Verify the gauge temperature. As stated in Lesson 2, the external water
gauge should be set at 85 to 90F (29.4 to 32.2C). To verify the gauge temperature,
do the following.
(a) Place a long-stemmed thermometer of known accuracy in the
processor wash tank.
(b) If you cannot maintain proper temperature, check the temperature
of the hot water supplying the mixing valve to see that it is at least 15F (8.3C) above
the temperature set at the mixing valve.
Temperatures showing on the gauge and the thermometer are not
necessarily the same, because they are taken at different points. But
readings should be consistently within two degrees of each other.
d. Calibrate the Dryer Thermostat.
(1) Verify that the film is drying properly. If the film is not drying properly,
check that the setting on the dryer thermostat is within the normal range of 120 to
150F (49 to 65.5C).
(2) Check the temperature without film being in the dryer. If the film is not
drying properly, but the dryer thermostat is set within the normal range, check the
temperature without film being in the dryer.
(a) Do not remove the receiving bin or the panel assembly.
(b) Place a thermometer of known accuracy (with the bulb up) in the
left-hand corner of the dryer.
(c) Ensure that the bulb of the thermometer does not touch any surface
while you are measuring the temperature.
(3) If there is a variance of more than 5 F between the thermostat setting
and the thermometer reading, reset the position of the thermostat by doing the
(a) Remove the thermostat knob.
(b) Loosen the locking screw.
Replace the knob; set the dial to the same reading as the
(d) Remove the knob; do not turn the shaft, tighten the screw, and
replace the knob.