HI8711 allows the selection of two set points with two independent outputs for acid and alkaline
dosages.
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Auto-diagnostics to verify offset and slope calibration and electrode contamination/deterioration
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Fail Safe Alarm System protects against problems caused by power supply failure or signal
interruption
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Selectable manual ON, OFF and automatic dosing control for alkaline and acid dosing with
indicator.
Fail Safe Alarm System
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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.
Self-Diagnostic Test
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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.
Overtime Dosing Protection
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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.
Matching Pin Connection
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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.
Output and Input Connections
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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.
Robust Design
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A removable, transparent splash-proof cover protects the front panel.
pH
