Structural/Accessory Maintenance
159
3. Wait at least 5 minutes to allow the recording
thermometer sensing bulb temperature to
stabilize. Then compare the “RET”
temperature in the controller display with the
recording stylus of the recorder. Write down
both readings.
4. If the average difference is 0.6 C (1.0 F) or
less, do not attempt to recalibrate.
5. If the recorder needs recalibration:
a. Place the pen in the recording position
(lowered against chart)
b. Loosen the lock screw using a small
Phillips screwdriver.
c. Adjust the setting screw with a small
slotted screwdriver or a 7 mm (9/32 in.)
open end wrench. Rotate the setting screw
clockwise until the recording pen
temperature reading is 2 to 4 C (4 to 6 F)
higher than the temperature reading of the
test instrument.
NOTE: Turning the setting screw one
complete revolution (360 degrees) changes
the temperature reading of the pen by
approximately 5 C (9 F).
d. Then rotate the setting screw
counterclockwise to lower the recording
pen reading until the pen reading agrees
with the “RET” controller display.
e. Tighten the lock screw.
f. Wait another 5 minutes while the unit
operates on Cool. Verify that the recording
thermometer reading is stable and agrees
with the “RET” temperature in the
controller display.
g. Press any key to unlock the controller
display screen.
Power Element Assembly
Replacement
The recording thermometer’s power element is
field replaceable. To replace the element
assembly:
1. Raise the stylus away from the chart. Remove
the knurled chart nut and chart.
2. Remove the recording platen.
3. Loosen five mounting screws that mount the
capillary holding plate and element assembly
in the recorder. Remove the power element
assembly (includes recording pen assembly).
4. Remove the old sensing bulb and capillary
from the unit.
5. Install the new sensing bulb and capillary in
the unit. The capillary of the new thermal
element may be bent, but do not bend the
bulb.
6. Install the capillary in the recorder and
securely tighten five mounting screws.
7. Replace the recording platen, recording chart
and chart nut. Lower the recording pen.
8. Check the calibration of the recorder.
Recalibrate the recorder if necessary.
Timer (Quartz Motor and Reducing
Gear) Replacement
The quartz motor is field replaceable. To replace
the motor and reducing gear assembly:
1. Raise the stylus away from the chart. Remove
the knurled chart nut and chart.
2. Remove the recording platen.
3. Loosen the two terminal screws on the
terminal board and remove the motor wires.
4. Loosen the five screws that mount the motor
assembly in the recorder. Remove the motor
assembly.
5. Install new motor assembly. Install an
securely tighten five mounting screws.
6. Connect the motor wires to the terminal board.
Make sure the red positive (+) and black
negative (-) wire are correctly aligned.
7. Check to see that the quartz motor is running.
Look through the inspection window and
make sure the internal flywheel on the quartz
motor is revolving.
8. Replace the recording platen, recording chart
and chart nut. Lower the recording pen.
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