Owner's manual

Calibration  5
MultiCal mmHgA/PSIA Pressure Module Manual
When resetting the adjustment range of the Fine Zero potentiometer (R1) should rst be set to the center of its rotational range. To center the Fine Zero,
rotate the Fine Zero potentiometer fully clockwise until a “click” is heard. Then rotate the Fine Zero potentiometer counter-clockwise 7½ turns. Adjust the
Course Zero pot until the output is as close to zero as possible. Trim in the nal reading to 0 mV ±0.01 mV with the Fine Zero potentiometer.
Fine Zero
mm HgA
psiA
-
Linearity
R1
R12
R15
Coarse Zero
Potentiometer locations.
6 Check the millimeters of mercury pressure points shown in the following table. Adjust R12 if necessary to bring the readings to within the tolerances shown
in the table.
Readings in mV @ 23 °C ±5 °C
True Pressure Acceptable Output (mV)
380 mmHgA 379.50 to 380.50
760 mmHgA 759.19 to 760.80
15 psiA 14.978 to 15.022
30 psiA 29.966 to 30.034
7 Set the switch on the MultiCal to the PSIA position.
8 Test the MultiCal at the 30 psiA point. The reading should be within the tolerance shown in the table above. If not, adjust R15 until both points are within
specication.
9 In the unlikely event that you are unable to adjust the MultiCal so that all of the points meet the tolerances of the table above, contact Customer Service for
assistance. Do not readjust linearity. The linearity adjustment is factory set and should never require readjustment, unless the sensor is replaced.