Starter 300 Operation; Calibration; Buffer Group - OHAUS ST300 Instruction Manual

STARTER 300 Portable pH Meter
4

STARTER 300 OPERATION

The basic procedure for pH measurement is as follows:
a) pH electrode preparation
b) buffer preparation and pH electrode calibration
c) sample preparation
d) pH measurement
e) Record measurement results
f) Rinse the pH electrode and store properly
For pH electrode preparation: pH electrode should be rinsed with pure water before and after
using. Check if the electrode is physically damaged. (Be careful with the glass bulb)
The pH electrode should be stored in the included storage bottle; the solution in the bottle is 3M
KCl. After placing pH electrode into the sample or buffer solution, carefully stir with the electrode
for several seconds then wait 30 to 60 seconds for the signal to be stabilize, and then press the
button to operate (Calibration or measurement).
WARNING Do not operate the equipment in hazardous environments. The
equipment is not explosion protected.
WARNING When using chemicals and solvents, comply with the instructions of the
chemical producer and the general lab safety rules.
STARTER 300 will turn off the power automatically without any press operation after 10 minutes.
4.1

Calibration

4.1.1

Buffer group

STARTER 300 can perform 1-, 2- or 3- point calibrations.
There are 4 buffer groups in the meter, you can select the buffer group you prefer (see 4.3),
default buffer group is b1 (US standard), and the buffer value will be automatically recognized
during calibration.
The 4 predefined buffer groups are (at 25°C):
b1 1.68
2.00
b2
1.68
b3
1.68
b4
STARTER 300 automatically corrects for the temperature dependence of the buffer pH values
given in the following table - buffer group b1.
4.01 7.00
4.01 7.00
4.00 6.86
4.01 6.86
10.01
9.21 11.00
9.18 12.46
9.18
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