อุปกรณ์วัด Control System (pH Analog Controller with Dual Output and Self-Diagnostic Test)

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