
TEST INST (S)
CALIBRATION CHECKLIST
PROC. NO.
Beckman Instruments pHI 31 pH Meter
MFG. MODEL
SER. NO.
PROCEDURE
STEP
NO.
(1)
FUNCTION TESTED
(2)
NOMINAL
(3)
MEASURED VALUES
FIRST RUN
(4)
SECOND RUN
(5)
OUT
OF
TOL
(6)
CALIBRATION TOLERANCES
(7)
NA 17–20SC–42
Page 1 of 2
3.1 Test Control Settings
TI control(s):
3.1.4 STD Key |/ _
(Press and allow TI display to
stabilize)
(pH) (pH)
3.1.5 TI operational check 7.00 6.97 to 7.03
3.1.6 TI control(s): (Remove BNC
short) pH key (press) TI
display drifts ck ( ) NA
4.2 PH Indication Tests
4.2.2 TI control(s):
pH key (press)
4.2.3 (DC millivolt source)
(mV) (pH) (pH)
295.80 2.00 1.97 to 2.03
177.50 4.00 3.97 to 4.03
59.20 6.00 5.97 to 6.03
–59.20 8.00 7.97 to 8.03
–177.50 10.00 9.97 to 10.03
–295.80 12.00 11.97 to 12.03
4.3 PH Calibration Tests
4.3.4 TI control(s):
CLR key (press)
STD Key |/ _(press)
for TI display
STD 1 of approx. 7.00 ck ( ) NA
NAVAIR 17–20SC–42
7
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