Select A Ph Resolution; Ph Calibration - OHAUS a-AB33M1 Manual De Instrucciones

EN-12
pH Buffer Group
USA standard
JJG standard
Europe standard
MERCK (Ref.20°C)
DIN (19266)
3.1.3

Select a pH resolution

To select a pH resolution:
1. Touch the Menu icon
2. Touch Setup.
3. Touch pH.
4. Touch Resolution.
5. Touch the resolution value you want to confirm your setting.
Note: pH Resolution value varies for different models, so please check the actual value
on the screen.
3.2

PH calibration

a-AB41PH model supports a maximum 5-point calibration, while a-AB33PH and a-
AB33M1 models support 3-point calibration. OHAUS recommends to perform at least 2-
point calibration.
Standard procedure of 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 or print
f) Rinse the pH electrode and properly store
PH electrode preparation: pH electrode should be rinsed with pure water before and
after use. Check if the electrode is physically damaged. (Be careful with the glass bulb.)
The pH electrode should be stored in the storage bottle; the solution in the bottle is 3M
KCl solution. After placing the pH electrode into the sample or buffer solution, user
should stir several seconds, wait for 30 to 60 seconds for the signal to stabilize, and
then press the related 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.
Table 3-1 Buffer group
Temperature
25°C 1.68
25°C 1.68
25°C
20°C
25°C 1.68
to enter menu option.
Analyzer and Bench Meter
pH Value
4.01 7
4.01 6.86
2 4.01 7
2 4 7
4.008 6.865
10.01 /
9.18 12.46
9.21 11
9 12
9.184 12.454