15
The temperature has an effect on pH. The calibration buffer solutions are
affected by temperature changes to a lesser degree than normal solutions.
During calibration the instrument will automatically calibrate to the pH
value corresponding to the measured or set temperature.
During calibration the instrument will display the pH buffer value at 25 ºC.
pH BUFFER TEMPERATURE
DEPENDENCE
P
M
E
T
S
R
E
F
F
U
B
H
p
C
º
F
º
8
6
.
1
1
0
.
4
6
8
.
6
1
0
.
7
8
1
.
9
1
0
.
0
1
5
4
.
2
1
0
2
3
7
6
.
1
1
0
.
4
8
9
.
6
3
1
.
7
6
4
.
9
2
3
.
0
1
8
3
.
3
1
5
1
4
7
6
.
1
0
0
.
4
5
9
.
6
0
1
.
7
9
3
.
9
4
2
.
0
1
8
1
.
3
1
0
1
0
5
7
6
.
1
0
0
.
4
2
9
.
6
7
0
.
7
3
3
.
9
8
1
.
0
1
9
9
.
2
1
5
1
9
5
7
6
.
1
0
0
.
4
0
9
.
6
5
0
.
7
7
2
.
9
2
1
.
0
1
0
8
.
2
1
0
2
8
6
8
6
.
1
0
0
.
4
8
8
.
6
3
0
.
7
2
2
.
9
6
0
.
0
1
2
6
.
2
1
5
2
7
7
8
6
.
1
1
0
.
4
6
8
.
6
1
0
.
7
8
1
.
9
1
0
.
0
1
5
4
.
2
1
0
3
6
8
8
6
.
1
2
0
.
4
5
8
.
6
0
0
.
7
4
1
.
9
6
9
.
9
9
2
.
2
1
5
3
5
9
9
6
.
1
3
0
.
4
4
8
.
6
9
9
.
6
1
1
.
9
2
9
.
9
3
1
.
2
1
0
4
4
0
1
9
6
.
1
4
0
.
4
4
8
.
6
8
9
.
6
7
0
.
9
8
8
.
9
8
9
.
1
1
5
4
3
1
1
0
7
.
1
5
0
.
4
3
8
.
6
8
9
.
6
4
0
.
9
5
8
.
9
3
8
.
1
1
0
5
2
2
1
1
7
.
1
6
0
.
4
3
8
.
6
8
9
.
6
1
0
.
9
2
8
.
9
0
7
.
1
1
5
5
1
3
1
2
7
.
1
8
0
.
4
4
8
.
6
8
9
.
6
9
9
.
8
9
7
.
9
7
5
.
1
1
0
6
0
4
1
2
7
.
1
9
0
.
4
4
8
.
6
8
9
.
6
7
9
.
8
7
7
.
9
4
4
.
1
1
5
6
9
4
1
3
7
.
1
1
1
.
4
4
8
.
6
9
9
.
6
5
9
.
8
6
7
.
9
2
3
.
1
1
0
7
8
5
1
4
7
.
1
2
1
.
4
5
8
.
6
9
9
.
6
3
9
.
8
5
7
.
9
1
2
.
1
1
5
7
7
6
1
6
7
.
1
4
1
.
4
6
8
.
6
0
0
.
7
1
9
.
8
4
7
.
9
0
1
.
1
1
0
8
6
7
1
7
7
.
1
6
1
.
4
7
8
.
6
1
0
.
7
9
8
.
8
4
7
.
9
0
0
.
1
1
5
8
5
8
1
8
7
.
1
7
1
.
4
7
8
.
6
2
0
.
7
7
8
.
8
4
7
.
9
1
9
.
0
1
0
9
4
9
1
9
7
.
1
9
1
.
4
8
8
.
6
3
0
.
7
5
8
.
8
5
7
.
9
2
8
.
0
1
5
9
3
0
2
1
8
.
1
0
2
.
4
9
8
.
6
4
0
.
7
3
8
.
8
6
7
.
9
3
7
.
0
1
34
• Reading status (2 chars): R - in range, O - over
range, U - under range. First character corresponds
to the appropriate range reading. Second character
corresponds to mV reading.
• Primary reading (corresponding to the selected range)
- 7 ASCII chars, including sign and decimal point.
• Secondary reading (only when primary reading is not
mV) - 7 ASCII chars, including sign and decimal point.
• Temperature reading - 8 ASCII chars, with sign and
two decimal points, always in ºC.
MDR
Requests the instrument’s model name and firmware code
(16 ASCII chars).
GLP
Requests the calibration data record.
The answer string contains:
• GLP status (1 char): represents a 4 bit hexadecimal
encoding.
• 0x01 - pH calibration available
• 0x02 - Rel mV calibration available
• pH calibration data (if available), which contains:
• the number of calibrated buffers (1 char)
• the offset, with sign and decimal point (7 chars)
• the average of slopes, with sign and decimal
point (7 chars)
• the calibration time,
yymmddhhmmss
(12 chars)
• buffers information (for each buffer)
• type (1 char): 0 - standard, 1 - custom
• status (1 char): N (new) - calibrated in last
calibration; O (old) - from an old calibration.
• warnings during calibration (2 chars):
00 - no warning, 04 - Clean Electrode warning.
• buffer value, with sign and decimal point
(7 chars).
• the calibration time,
yymmddhhmmss
(12 chars).
• electrode condition, with sign (3 chars). The
“-01” code means not calculated.
• Rel mV calibration data (if available), which contains:
• the calibration offset, with sign (7 chars)
• the calibration time,
yymmddhhmmss
(12 chars).
PAR
Requests the setup parameters setting.
The answer string contains: