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

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 with indicator
• Dual set point with two independent dosing outputs
• Extended temperature compensation range: -20 to 100°C
• Supports potential matching pin connection
• Both 4-20 and 0-20 mA output     
• ±5V outputs for amplified electrodes
• Fail Safe Function–the alarm relay is activated at power down
• Operational mode LED indicators
• Backlit LCD
• Transparent splash-proof cover

 

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 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.

 

Order Information:
The HI 8711 is supplied with mounting brackets and instructions.

  Manual: Download

Specification :

Range		0.00 to 14.00 pH
Resolution		0.01 pH
Accuracy @ 20 °C		±0.02 pH (0 to 100 °C) ±0.05 pH (-20 to 0 °C) ±0.5% (input from transmitter)
Input		high impedance 1012 Ohm; reference and matching pin inputs are available; 4-20 mA
Power Output		±5 Vcc; 150 mA max load for amplified electrodes
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)
Recorder Output		0-20 mA or 4-20 mA (isolated)
Setpoint Relay		2, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected)
Setpoint Range		alk. set: from 0.00 to 14.00 pH acid set: from 0.00 to 14.00 pH
Alarm Relay		1, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected)
Alarm 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
Backlight		continuous on
Power Supply		115 VAC ±10% or 230 VAC ±10%; 50/60 Hz
Enclosure		flame 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 Cutout		141 x 69 mm (5.6 x 2.7″)
Weight		1 kg (2.2 lb.)