HI 8711
pH Analog Controller with Dual Output and Self-Diagnostic Test
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.
Specifications
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.)
Accessories
Solutions
HI 7004/1L 4.01 pH Buffer Solution
1 x 1 L bottle
HI 7007/1L 7.01 pH Buffer Solution
1 x 1 L bottle
HI 7010/1L 10.01 pH Buffer Solution
1 x 1 L bottle
Accessories
HI 8427 pH and mV Precision Simulator
HI 931001 pH and mV Precision Simulator
