5.0 - CALIBRATION PROCEDURE - PRESSURE/TEMPERATURE POTENTIOMETER ADJUSTMENTS (continued)
11
NOTES: 1) Turning the adjusting screw of the pressure range potentiometer in the clockwise direction raises the sterilizer pressure reading while turning the adjusting
screw in the counter-clockwise direction lowers the sterilizer pressure reading.
2) Turning adjusting screw 1/4 turn raises or lowers the temperature of the sterilizer
approximately 3O˚F (1.67˚C). On old style PC boards, turning the adjusting screw of the temperature potentiometer in the clockwise direction raises the sterilizer tem-
perature while turning the adjusting screw in the counter clockwise direction lowers the sterilizer temperature. On new style PC boards, it is the opposite.
4) PRESSURE ZERO ADJUSTMENT (Potentiometer #1): Turn the adjusting screw of the pressure zero potentiometer, #1 (see Figures 2 and 3, pages
13-14), in the counter-clockwise direction until the Pressure (psi) display reads 0.0 psi (0.0 kPa). (See Notes 1 and 2 below.) Then turn clockwise
until pressure display reads 0.1 psi (kPa).
5)
TEMPERATURE ADJUSTMENT (Potentiometer #3): Continue by determining the style of PCB and confirming meter lead attachment points (see
Figures 2 and 3, pages 13-14). Set the multi-meter to read VDC, at least the 5 Volts range. Connect the red lead
of the multi-meter to Test Point
(A) and the black lead
of the multi-meter to Test Point (B). (See Figures 2 and 3, pages 13-14.)
CAUTION Test Points for the multi-meter leads must be connected exactly as shown in the illustration - Figures 2 and 3, pages 13-14. Connecting
a lead to the wrong side of the resistor or wrong pin of the chip will result in an incorrect adjustment.
6) The multi-meter should read 2.550 VDC +/- 0.001 VDC. If the multi-meter reading is not 2.550 VDC +/- 0.001 VDC, turn the adjusting screw on
the temperature potentiometer #3 in a clockwise direction to lower the voltage setting or a counter-clockwise direction to raise the voltage setting
until the multi-meter reading is 2.550 VDC, +/- 0.001 VDC. (See Notes 1 and 2 below.)
NOTE In this step, if the digital multi-meter being used has only three digits, turn the adjusting screw on the potentiometer #3 counter-clockwise
(see Figures 2 and 3, pages 13-14) then adjust to a setting of 2.54 VDC and then adjust counter-clockwise to 2.55 VDC.
7) For temperature verification in a later step, place a Max-Register Thermometer on the tray and close the sterilizer door.
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