HI-8711 pH Analogue Controller with dual output and self-diagnostic test
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HI-8711
HI-8711 pH Analogue Controller with dual output and self-diagnostic test.
HI-8711 allows the selection of two set points with two independent outputs for acid and alkaline dosages.
Each model accepts either a direct input from a pH or ORP electrode or from a transmitter through 4-20 mA input. The instrument also provides ±5V power output and input terminals for amplified electrodes. In addition, you can choose the output configuration for connecting a recorder or a PLC, between 0-20 or 4-20 mA.
The HI-8711 incorporates adjustable overtime dosage protection from 5 to 60 minutes. If dosing exceeds selected time, the alarm will be triggered and the dosing contact will deactivate. This feature can be activated or deactivated.
A removable, transparent splash-proof cover protects the front panel.
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| Range - pH | 0.00 to 14.00 pH | |
| Resolution | 0.01 pH | |
| Accuracy | ±0.02 pH (0 to 100°C) ±0.05 pH (-20 to 0°C) ±0.5% (input from transmitter) | |
| Input | High impedance 10 12 Ohm; Reference and Matching pin inputs are available; 4-20 mA | |
| Power Output | ±5 Vcc; 150 mA max load for amplified electrodes | |
| Calibration | Offset: ±2 pH with OFFSET trimmer; Slope: 80 to 110% with SLOPE trimmer | |
| Temperature Compensation | fixed or automatic with Pt100, from -20 to 100°C (-4 to 212°F) | |
| Recorder Output | 0-20 mA or 4-20 mA (isolated) | |
| Setpoint Relay | 2, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected) | |
| Setpoint Range | 0.00 to 14.00 pH | |
| Alarm Relay | 1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected) | |
| Alarm Range | 0.2 to 3.00 pH | |
| Dosing Control | OFF/AUTO/ON with selection switch | |
| Over Dosing Control | Adjustable, from 5 min to 60 min with button or disable by wire strap - on rear panel | |
| Backlight | Continuous ON | |
| Power Supply | 115 or 230 Vac; 50/60 Hz | |
| Enclosure | Flame retardant ABS body and front panel; transparent splash-proof front cover | |
| Environment | -10 to 50°C (14 to 122°F); RH max 95% non-condensing | |
| Panel Cutout | 141 x 69 mm (5.6 x 2.7") | |
| Weight | 1 kg (2.2 lb.) |
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