Product information "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
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.
The HI 8711 is supplied with mounting brackets and instructions.
Range 0.00 to 14.00 pH
Resolution 0.01 pH
@ 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
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.)