pH Analog Controller with Dual Output and Self-Diagnostic Test

HI8711

pH Analog Controller with Dual Output and Self-Diagnostic Test

$749.99

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.

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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 currents, 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.

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Specifications

Specification Name	Detail
sku	HI8711
pH Range	0.00 to 14.00 pH
pH Resolution	0.01 pH
pH Accuracy (@20°C/68°F)	±0.02 pH (0 to 100 °C)/ ±0.05 pH (-20 to 0 °C) (electrode); ±0.5% (transmitter)
Temperature Compensation	Fixed or automatic with Pt100 from -20 to 100 °C (-4 to 212 °F)
Calibration	Offset: ±2 pH with OFFSET trimmer; Slope: 80 to 110% with SLOPE trimmer
Recorder Output	0-20 mA or 4-20 mA (isolated)
Analog Input	4 to 20 mA
Power Output	±5 Vcc; 150 mA max load for amplified electrodes
Setpoint Relay	2, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)
Setpoint Range	0.00 to 14.00 pH
Backlight	Continuous ON
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
Power Supply	115 or 230 Vac; 60/50 Hz
Alarm Relay	1, isolated, 2 A, Max 240 V, resistive load, 1000000 strokes (not fuse protected)
Alarm Range	0.2 to 3.00 pH
Environment	$-10 to 50°C (14 to 122°F); RH max 95% non-condensing
Enclosure/ Case Material	Black anodized aluminium body; front and back with ABS; transparent splash-proof front cover
Dimensions	141 x 69 mm (5.6 x 2.7'')
Weight	kg (2.2 lb.)

Product Manuals

HI8711 Manual Download