Milwaukee MW151 MAX - pH Measurement; pH Calibration

pH 27
8. pH
8.1. PREPARATION
MW150: Up to 3-point calibration using 7 standard buers.
MW151: Up to 5-point calibration using 7 standard buers and 2custom buers (CUST
and CUST).
1. Prepare two clean beakers. One beaker is for rinsing and one for calibration.
2. Pour small quantities of the selected buer solution into each beaker.
3. Remove the protective cap and rinse the probe with the buer solution for the first
calibration point.
8.2. CALIBRATION
General Guidelines
For better accuracy, frequent calibrations are recommended.
The probe should be recalibrated at least once a week, or:
y Whenever is replaced
y After testing aggressive samples
y When high accuracy is required
y When the calibration time out has expired
Procedure
1. Place the pH probe tip approximately 4 cm (1 ½”) into the buer solution and
stir gently. For a 2-point calibration, use the pH 7.01 (pH 6.86 for NIST) buer first.
Press CAL/EDIT to enter Calibration mode. Buer value and “WAIT” message are
displayed blinking. If required, use the  keys to select a dierent buer value.
pHmV
NO MTC ATC
USB
OPEN
AUTO
HOLD
SLOPE
CLEAR
CAL
1.68
4.01
6.86
7.01
9.18
10.01
12.45
CUST1
CUST2
DATE
ACCEPT
ºC
ºF
pH
mV
TIME
pHmV
NO MTC ATC
USB
OPEN
AUTO
HOLD
SLOPE
CLEAR
CAL
1.68
4.01
6.86
7.01
9.18
10.01
12.45
CUST1
CUST2
DA
TE
ACCEPT
ºC
ºF
pH
mV
TIME
2. When the reading is stable and close to the selected buer, the ACCEPT tag is
displayed blinking. Press GLP/ACCEPT to confirm calibration.