INE-PHS-3E 2016
13
Appendix
Appendix 1
˖
Buffer solution’s relationship between pH value and temperature
Temperature
0.05mol/kg
Potassium hydrogen
phthalate
0.025mol/kg
mixed phosphate
0.01mol/kg
sodium tetraborate
5 4.00 6.95
9.39
10 4.00 5.92
9.33
15 4.00 6.90
9.28
20 4.00 6.88
9.23
25 4.00 6.86
9.18
30 4.01 6.85
9.14
35 4.02 6.84
9.11
40 4.03 6.84
9.07
45 4.04 6.83
9.04
50 4.06 6.83
9.02
55 4.07 6.83
8.99
60 4.09 6.84
8.97
Appendix 2
˖
Instrument display comparison table
Display Reason Solution
1. Always displays “Err”
Instrument has self-check
function, it will show this
information when it is wrong
with storage chip.
Shut down and turn it on
after a while for a few times.
If the problem is still exists,
please contact our company.
2. It displays “Err” in mV area
and temperature part is
normal.
Instrument will show this
information when input
potential is over range.
Try to insert the short circuit
plug into the electrode
socket.If the problem is still
exists, please contact our
company.
3. In the measuring state, the
instrument can not switch to
pH measuring state.
When the measuring range
is over ±20.00pH, the
instrument will show”Err” first
and then switch to mV
measuring state
1. Reduce the input signal.
2.
Try to insert the short
circuit plug into the electrode
socket.If the problem is still
exists, please contact our
company.
4. In the measuring state,
press “ENTER” button and
hold at least 3 seconds,
instrument shows “SYS rst”.
Calibration data reset
function.
It means “System reset?”
If user needs to reset, press
“ENTER” button at this time,
otherwise you can press any
other key to exit.
5. Press “STD” or “Slope”
button and instrument shows
“std YES”.
This is normal. It means
“Standard yes?”
If user wants to calibrate the
electrode, press “ENTER”
button at this time, otherwise
you can press any other key
to exit.
6. Display error.
Please contact our company.
Appendix 3: Term explanation
pH slope: The variable quantity of potential caused by each 1 pH value, it is represented
symbolically by mV/pH or %.
E
0
of pH: Also known as “zero-potential”, it always means the potential value when pH is 7.
One-point calibration: Use one pH buffer solution to do calibration.
Two-point calibration: Use two pH buffer solution to do calibration.
