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Hanna

HI8711 Dual Setpoint – pH analog Controller with 4 to 20mA

Product code: MX-12560

Inputs: BNC connector, Direct wire connection with amplified probe (supports HI 1006 series probes) and 4-20 mA from a transmitter Auto-diagnostics to verify offset and slope calibration and electrode contamination/deterioration Selectable manual ON, OFF and automatic dosing control for alkaline, acid and REDOX dosing…

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Product description

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.

Specifications

Range0.00 to 14.00 pH
Resolution0.01 pH
Accuracy @ 20 °C±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 Rangealk. set: from 0.00 to 14.00 pH acid set: from 0.00 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 knob or disable by wire strap – on rear panel
Backlightcontinuous on
Power Supply115 VAC ±10% or 230 VAC ±10%; 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.)