25
OVERDOSAGE TIMER
All models provide for an overdosage alarm system
ranging from 1 to 10 minutes. The maximum time
interval for the dosing terminals continuously activated
is user-selectable through a knob on the front panel.
If this period elapses, the alarm terminals are activated and dosage
disactivated, to ensure that chemicals do not run out, or pumps or
electrovalves do not cease to function properly.
The
HI9911
model provides for two independent
time controls, one for acid dosage and one for
alkaline.
Please refer to the below table for a more accurate pH calibration:
pH VALUES AT VARIOUS TEMPERATURES
Examples: 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 temperature is 20 °C,
calibrate to 4.00, 7.03 or 10.06; if the temperature is 50 °C, calibrate to
4.06, 6.98 or 9.82.
TEMP
pH VALUES
°C
°F
4.01
6.86
7.01
9.18
10.01
0
32
4.01
6.98
7.13
9.46
10.32
5
41
4.00
6.95
7.10
9.39
10.24
10
50
4.00
6.92
7.07
9.33
10.18
15
59
4.00
6.90
7.04
9.27
10.12
20
68
4.00
6.88
7.03
9.22
10.06
25
77
4.01
6.86
7.01
9.18
10.01
30
86
4.02
6.85
7.00
9.14
9.96
35
95
4.03
6.84
6.99
9.10
9.92
40
104
4.04
6.84
6.98
9.07
9.88
45
113
4.05
6.83
6.98
9.04
9.85
50
122
4.06
6.83
6.98
9.01
9.82
55
131
4.07
6.84
6.98
8.99
9.79
60
140
4.09
6.84
6.98
8.97
9.77
65
149
4.11
6.85
6.99
8.95
9.76
70
158
4.12
6.85
6.99
8.93
9.75