User's Manual
27
pH VALUES AT VARIOUSpH VALUES AT VARIOUS
pH VALUES AT VARIOUSpH VALUES AT VARIOUS
pH VALUES AT VARIOUS
TEMPERATURESTEMPERATURES
TEMPERATURESTEMPERATURES
TEMPERATURES
With HI 9913 and HI 9935, the cycles are selectable
from 1 to 10 minutes for both pH and EC/TDS. For HI
9923 instead, the timers can be set from 1 to 90
minutes to allow for proper blow down of the boiler or
cooling tower.
Should this period elapse, the alarm terminals are
activated (and dosage terminals are disactivated).
This is to ensure that fertilizers or chemicals have not
run out or pumps or electrovalves have not ceased to
function properly.
m TIMERS
MINUTES
pH TIMER
MINUTES
1
90
45
1
90
45
TIMER
MINUTES
1
10
2.5
5
7.5
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
Please refer to the following chart for a more accurate pH calibra-
tion:
For instance, if the buffer temperature is 25°C (77°F), calibrate the
meter to read 4.01, 7.01 or 10.01 on the display.
If the buffer temperature is 20°C, calibrate it to 4.00, 7.03 or 10.06.
If the buffer temperature is 50°C, calibrate it to 4.06, 6.98 or 9.82.