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HI-8711 pH Analogue Controller with dual output and self-diagnostic test.


£929.60 (exc.VAT)
£1,115.52 (tax incl.)
Full Description Specification Manuals

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 - pH0.00 to 14.00 pH
Resolution0.01 pH
Accuracy±0.02 pH (0 to 100°C)
±0.05 pH (-20 to 0°C)
±0.5% (input from transmitter)
InputHigh 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
CalibrationOffset: ±2 pH with OFFSET trimmer;
Slope: 80 to 110% with SLOPE trimmer
Temperature Compensationfixed or automatic with Pt100, from -20 to 100°C (-4 to 212°F)
Recorder Output0-20 mA or 4-20 mA (isolated)
Setpoint Relay2, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)
Setpoint Range0.00 to 14.00 pH
Alarm Relay1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)
Alarm Range0.2 to 3.00 pH
Dosing ControlOFF/AUTO/ON with selection switch
Over Dosing ControlAdjustable, from 5 min to 60 min with button or disable by wire strap - on rear panel
BacklightContinuous ON
Power Supply115 or 230 Vac; 50/60 Hz
EnclosureFlame 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 Cutout141 x 69 mm (5.6 x 2.7")
Weight1 kg (2.2 lb.)