33
32
- Air bubbles also disturb measurements and the probe should be
installed in such a way as to minimize them.
Note
:
It is always recommended to keep at least one spare probe
handy. When anomalies are not resolved with a simple mainte-
nance, change the electrode (and recalibrate the controller) to see
if the problem is alleviated.
Note
:
Ensure that the probe is installed in such a way that it perma-
nently lies in the solution whether in the tank or the circulation
pipe.
ACCESSORIES
pH electrodes
HI 1001
pH electrode for continuous flow-through monitoring
HI 1002
pH electrode for continuous flow-through monitoring
HI 1003
pH electrode with matching pin
EC probes
HI 7632/D
Conductivity probe, ATC, 1/2” thread, with DIN
connector and 2 m (6.6’) cable, for continuous flow-
through monitoring up to 3 atm pressure
HI 3003/D
Conductivity probe, ATC, Pt-ring, Kynar
®
body,
1/2” thread, with DIN connector and 2 m (6.6’)
cable, for continuous flow-through monitoring up to
6 atm pressure
pH calibration solutions
HI 7004L
pH 4.01 buffer solution, 500 mL bottle
HI 7007L
pH 7.01 buffer solution, 500 mL bottle
HI 7010L
pH 10.01 buffer solution, 500 mL bottle
EC calibration solutions
HI 7031L
1.41 mS/cm calibration solution, 500 mL bottle
HI 7039L
5.00 mS/cm calibration solution, 500 mL bottle
Maintenance solutions
HI 70300L
Electrode storage solution, 500 mL bottle
HI 7061L
General cleaning solution, 500 mL bottle
Other accessories
BL1.5, BL3, BL5, BL7, BL10, BL15, BL20
Dosing pumps with flow rate from 1.5 to 18.3 lph
(0.4 to 4.8 gph)
APPENDIX - A
pH VALUES AT VARIOUS TEMPERATURES.
The temperature directly affects the pH value.
For example, if the buffer’s temperature is 25°C (77°F), calibrate the
meter to read 7.01, 4.01 or 10.01; if the temperature is 20°C, calibrate
the meter to 7.03, 4.00 or 10.06; if the temperature is 50°C, calibrate
the meter to 6.98, 4.06 or 9.82; etc.
Please refer to the following chart for a more accurate pH calibration.
TEMP
pH VALUES
°C
°F
4.01
6.86
7.01
9.18
10.01
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
32
41
50
59
68
77
86
95
104
113
122
131
140
149
158
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
4.11
4.12
6.98
6.95
6.92
6.90
6.88
6.86
6.85
6.84
6.84
6.83
6.83
6.84
6.84
6.85
6.85
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
6.99
6.99
9.46
9.39
9.33
9.27
9.22
9.18
9.14
9.10
9.07
9.04
9.01
8.99
8.97
8.95
8.93
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
9.76
9.75
