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HI8711 pH controller is ideal for process control monitoring in a wide range of industrial applications. HI8711 allows the selection of two set points with two independent outputs for acid and alkaline dosages.
- Auto-diagnostics to verify offset and slope calibration and electrode contamination/deterioration
- Fail Safe Alarm System protects against problems caused by power supply failure or signal interruption
- Selectable manual ON, OFF and automatic dosing control for alkaline and acid dosing with indicator.
Details
These instruments have been designed for easy and fast installation,and are provided with membrane keypads on the front panel, large display and auto diagnostic functions. All connections are made through screw terminals on the rear panel.
Each model accepts either a direct input from a pH or ORP electrode or from a transmitter through 4-20mA input.
The instrument also provides ±5V power output and input terminals for amplified electrodes. Moreover, you can choose the output configuration for connecting a recorder or a PLC, between 0-20 or 4-20 mA.
HI8711 FEATURES/BENEFITS:
Fail Safe Alarm System
- Hanna’s exclusive Fail Safe Alarm System protects against problems caused by power supply failure or signal interruption, which are typical risks in industrial environments. An alarm condition is indicated by a red LED, located directly on the front panel of the controller.
Overtime Dosing Protection
- The HI8711 incorporates adjustable overtime dosing 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.
Output and Input Connections
- 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. Moreover, you can choose the output configuration for connecting a recorder or a PLC, between 0-20 or 4-20 mA
Self-Diagnostic Test
- Built-in autodiagnostic functions enable the user to check and troubleshoot any malfunctions. The functions are made via front panel keys to isolate the cause of malfunction whether it is due to pH electrode contamination, internal offset circuit or the amplifier circuit.
Matching Pin Connection
-
Supports potential matching pin connection to avoid typical problems caused by grounding loop current, such as progressive damage of the electrode, fluctuating measurements, and poor process regulation.
Robust Design
- A removable, transparent splash-proof cover protects the front panel.
| pH Range | 0.00 to 14.00 pH |
|---|---|
| pH Resolution | 0.01 pH |
| pH Accuracy | ±0.02 pH (0 to 100 °C); ±0.05 pH (-20 to 0 °C); ±0.5% (input from transmitter) |
| pH 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) |
| Alarm Relay Set Point | 1, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected) |
|---|---|
| Alarm Relay 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 knob or disable by wire strap – on rear panel |
| Analog Ouput Signal | 0-20 mA or 4-20 mA (isolated) |
| Backlight | continuous on |
| Voltage Output | ±5 Vcc; 150 mA max load for amplified electrodes |
| Enclosure | flame retardant ABS body and front panel; transparent splash-proof front cover |
| Panel Cutout | 141 x 69 mm (5.6 x 2.7’’) |
| Setpoint | 2, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected); range: alk. set: from 0.00 to 14.00 pH; acid set: from 0.00 to 14.00 pH |
|---|---|
| Input Impedance | high impedance 10¹² Ohm; reference and matching pin inputs are available; 4-20 mA |
| Power Supply | 230 Vac, 60/50 Hz |
| Environment | -10 to 50°C (14 to 122°F); RH max 95% non-condensing |
| Weight | 1 kg (2.2 lb.) |
| Ordering Information | The HI8711 is supplied complete with mounting brackets and instructions. |
