Specifications

39
MODEL 30 pH/DO SECTION 6.0
CALIBRATION
a. Press MENU. The main menu screen appears. Choose Calibrate.
b. Choose Sensor2 (pH sensor).
c. Choose Measurement.
d. Choose BufferCal.
e. Choose Auto.
f. Choose Buffer1.
g. Rinse the sensor with water and place it in buffer 1. Be sure the glass bulb
and reference junction are completely submerged. Swirl the sensor.
h. The screen at left is displayed until the reading is stable (<0.02 pH change
in 10 sec). When the reading is stable, the screen in step i appears. To
bypass automatic stabilization, press ENTER at any time.
i. The top line shows the actual reading (S2Live).The analyzer also identifies
the buffer and displays the nominal buffer value (buffer pH at 25°C). If the
displayed value is not correct, press " or ' to select the correct value. The
nominal value will change, for example, from 7.01 pH to 6.86 pH. Press
ENTER.
j. The screen shown at left appears.
k. Remove the sensor from buffer 1, rinse it with water, and place it in buffer
2. Swirl the sensor. Choose Buffer2.
l. The screen at left is displayed until the reading is stable (<0.02 pH change
in 10 sec). When the reading is stable, the screen in step m appears. To
bypass automatic stabilization, press ENTER at any time.
m. The top line shows the actual reading (S2Live).The analyzer also identifies
the buffer and displays the nominal buffer value (buffer pH at 25°C). If the
displayed value is not correct, press " or ' to select the correct value. The
nominal value will change, for example, from 7.01 pH to 6.86 pH. Press
ENTER to accept the nominal value.
n. If the calibration was successful, the analyzer will display the offset and
slope (at 25°C). The display will return to the screen in step b. Choosing
Sensor1 (dissolved oxygen sensor) will permit the dissolved oxygen meas-
urement to be calibrated.
o. If the slope is out of range (less than 45 mV/pH or greater than 60 mV/pH),
an error screen appears. The display then returns to step f. Repeat the cal-
ibration.
p. To return to the main display, press MENU followed by EXIT.
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Hold
Program Display
Calibrate?
SSeennssoorr11
Sensor2
CalSensor2?
MMeeaassuurreemmeenntt
Temp
S2BufferCal?
AAuuttoo
Manual
S2AutoCal?
BBuuffffeerr11
Buffer2
S2AutoCal?
BBuuffffeerr11
Buffer2
S2 Standardize
Slope
BBuuffffeerrCCaall
S2Live 7.00pH
AutoBuf1
WWaaiitt
S2Live 7.00pH
AutoBuf1
77..0011ppHH
S2Live 7.00pH
Buf2
WWaaiitt
S2Live 7.00pH
AutoBuf2
77..0011ppHH
S2Offset 6mV
Slope 59.16@25
°C
Calibration
Error
S2AutoCal?
Buffer1
BBuuffffeerr22