Service manual
6-- 24T--318
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1. Recorder Door
2. Change Chart Button
3. Recorder Box
4. Pen Tip
5. Stylus Arm
6. Connector
7. Calibration Button (Located underneath)
8. Mounting Screws, #10-24 x 7/16 inches long
9. Hold Down Tab
10. Chart Retaining Nut
Figure 6-31 Electronic Partlow Temperature Recorder
6.24.3Adjusting the Recorder Stylus
Proper stylus force upon the chart paper is important.
Factory adjustment is 113 to 127 grams (4 to 4.5
ounces). To measure the force, use a spring type gauge
and attach it under the stylus as close as possible to the
pen tip (item 4). Exert pull on the gauge perpendicular to
the chart surface. The measured force should be noted
just as the pen tip leaves the surface.
NOTE
The two coil springs near the base of the stylus
are NOT involved in establishing chart contact
force. They serve only to hold the stylus in its
retracted position.
Correct adjustment is made by carefully bending the
portion of the stylus arm between the bend near the pen
tip and the first bend towards the stylus arm base. If the
force is too low , the stylus trace will be light and difficult
to read. If the force is too great, wrinkling or tearing of the
paper chart may occur.
6.24.4Rezeroing the Recording Thermometer
For Electronic Partlow Recorder CTD P/N
12-00464-xx
Where xx= an even number (example: 12-00464-06)
NOTE
Use chart CTD P/N 09-00128-00 (degrees F)
P/N 09-00128-01 (degrees C).
a. Press the “Calibration” button (item 7, Figure 6-31)
on the bottom of the recorder . The pen tip will drive
fully down scale, then move upscale to the chart ring
at 0 degrees C (32 degrees F), and stop.
b. If the tip of the pen (item 4) is on the 0 C (32 F) chart
ring the recorder is in calibration, proceed to step c.
IfthetipofthepenisNOTonthe0C(32F)chart
ring, the operator must loosen the two screws on the
bottom of the stylus arm to adjust the pen tip
manually to the 0 C (32 F) chart ring. Tighten the
screws when adjustment is complete.
c. Press the calibration button and the pen will position
itself to the correct temperature reading.