Hanna Instruments HI 8614 - Manual (Page 7)

13 12
pH CALIBRATION WITH FIXED
TEMPERATURE COMPENSATION
(HI 8614 & HI 8614L only)
• Take the temperature of the
buffer solutions using a
Checktemp or a thermom-
eter with a resolution of at
least 1°.
• Connect the appropriate re-
sistor to the "TEMP.
PROBE" terminals (see
page 6) depending on the
temperature of the calibra-
tion solution.
• Follow the procedure as outlined in the
calibration with automatic temperature com-
pensation and use the thermometer read-
ing to adjust the trimmer until the amme-
ter reads the value according to the follow-
ing table.
°C
Under normal application, adjustment on this
module may not be necessary.
If routine check is required, the following pro-
cedures shall be performed.
• Calibrate the transmitter module using a
ammeter, as explained in the previous
pages.
• Simulate a 4.00 mA loop current for the
transmitter (i.e. pH 0.00 as Electrode in-
put) and check for display reading.
• Simulate a 20.00 mA loop current for the
transmitter (i.e. pH 14.00 as Electrode
input) and check for display reading.
Note: when the instrument is used in con-
junction with the Hanna indicator
HI 8510T or controllers HI 8710T,
HI 8711T, the calibration can also be
performed on the indicator/controller.
In this case slight calibration adjust-
ment can be made on the indicator/
controller even if the whole system cali-
bration is advised, always starting from
the transmitter.
0
5
10
15
20
25
30
35
40
45
50
55
60
32
41
50
59
68
77
86
95
104
113
122
131
140
4.01
4.00
4.00
4.00
4.00
4.01
4.02
4.03
4.04
4.05
4.06
4.07
4.09 8.576
8.565
8.565
8.565
8.565
8.576
8.587
8.599
8.610
8.622
8.633
8.645
8.667 7.13
7.10
7.07
7.04
7.03
7.01
7.00
6.99
6.98
6.98
6.98
6.98
6.98 12.137
12.103
12.069
12.034
12.023
12.000
11.989
11.977
11.966
11.966
11.966
11.966
11.966 10.32
10.24
10.18
10.12
10.06
10.01
9.96
9.92
9.88
9.85
9.82
9.79
9.77
15.789
15.697
15.629
15.560
15.491
15.434
15.377
15.331
15.285
15.251
15.217
15.182
15.159
°C °F pH m A pH m A pH m A
Temperature pH 4.01 Buffer pH 7.01 Buffer pH 10.01 Buffer