Checking Temperature Compensation - Fig. 4.3; Calibrating Conventional Ph Analyzers; Calibration Mode - Fig. 4.3; Checking Temperature - ABB 2410 Instruction Manual

4.3.2 Checking Temperature

Compensation – Fig. 4.3
a) Calibrate the Model 2410 as detailed in
Section 4.3.1.
b) Programme the instrument under test for
manual temperature compensation and
set the temperature to 0°C.
With reference to Fig. 4.3:
1 Set the Function switch to 'CALIBRATE'.
2 Set the Mode switch to 'mV'.
3 Set the Power switch to 'ON'.
4 Use the 'OUTPUT ADJUST' control to set
163 mV on the Model 2410's display
(rounded up from 162.6mV in Table 4.1).
The instrument under test should read
4.00.
5 Use the 'OUTPUT ADJUST' control to set
–134 mV on the Model 2410's display
(rounded down from 134.1 mV in Table
4.1). The instrument under test should
read 9.47.
Note. The instrument under test
should read 9.47 as this is the
correct value for the 9.00 buffer at
0°C.
Repeat steps 4 and 5 at 50°C and 80°C using
the corresponding millivolt equivalent.
TEMP
C
40
25
20
0
CALIB
SLOPE
Temp mV pH
2
Fig. 4.3 Temperature Compensation and
Calibration Mode
OUTPUT
ADJUST
1000M
60
100k
80 CALIBRATE
MEASURE
100
TEMP
ON OFF
3
4 OPERATION AS A SIMULATOR...
4.4 Calibrating Conventional pH
Analyzers
4.4.1 Calibration Mode – Fig. 4.3
1 Set the Function switch to 'CALIBRATE'.
2 Set the Mode switch to either 'pH' or 'mV'
dependant on the calibration required.
3 Set the Power switch to 'ON'.
4 Use the 'OUTPUT ADJUST' control to
obtain an appropriate calibration value on
the digital display of the Model 2410, e.g.
7 pH (if pH units selected).
Adjust the reading on the pH analyzer under
test to 7.00 pH using the adjust buffer,
standardise or calibrate control on that
instrument, as applicable.
5 Use the 'OUTPUT ADJUST' control to give
0, 2, 4, 6, 8, 10, 12 and 14 pH to check the
accuracy of the pH analyzer.
Alternatively, if mV units are selected,
adjust to the corresponding millivolt
equivalents from Table 4.2.
4.4.2 Checking Temperature
Compensation – Fig. 4.3
a) Calibrate the Model 2410 as detailed in
Section 4.4.1.
b) Set the manual temperature control on the
instrument under test to 10°C.
Refer to Fig. 4.3 and:
1 Set the Function switch to 'CALIBRATE'.
2 Set the Mode switch to 'mV'.
4
3 Set the Power switch to 'ON'.
5
4 Use the 'OUTPUT ADJUST' control to set
the appropriate millivolt outputs for 4, 7
1
and 9 pH (at 10°C) on the Model 2410
display from Table 4.2.
Check the reading on the pH analyzer
under test for each value.
Repeat the check with the temperature control
set to 50°C and 100°C.
5