Choosing the right controller needs to be decided based on the following criteria:
- Parameters to be measured: pH, mV, T°C, Conductivity
- Range
- Control desired: ON / OFF or proportional
- Set points: 1 or 2 for pH, 1 for other types of controllers
- Is an alarm needed
- Output signal: analog 4 to 20 mA to record or digital RS-232
pH 500
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to enlarge |
| Range |
0.00 to 14.00 pH
-600.0 to 600.0 mV
-9.9 to 120°C |
| Control |
ON/OFF or
Proportional |
| Set Point |
1 or 2 |
| Alarm |
Yes |
| Output |
Analog or Digital | |
HI 931700U
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to enlarge |
| Range |
0.00 to 14.00 pH
|
| Control |
ON/OFF |
| Set Point |
1 |
| Alarm |
No |
| Output |
Analog | |
HI 8710
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to enlarge |
| Range |
0.00 to 14.00 pH
|
| Control |
ON/OFF |
| Set Point |
1 |
| Alarm |
Yes |
| Output |
Analog | |
HI 8711
click on photo
to enlarge |
| Range |
0.00 to 14.00 pH
|
| Control |
ON/OFF |
| Set Point |
2 |
| Alarm |
Yes |
| Output |
Analog | |