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

HI 8710

pH Analog Controller with Self-Diagnostic Test

HI 8710 is a panel mounted pH controller with self-diagnostic test capabilities. Users can set: the setpoint for acid or alkaline dosage, the tolerance of the setpoint before an alarm is activated, the dosage mode: automatic, continuous on or OFF and the over dosage control by setting the overtime dosage knob.

When used in conjunction with the HI 8720 ORP controller, the ODCD* function will ensure that the ORP dosage will start only when the pH level is correct.

“Overtime dosage” function with selection knob and jumper for disable on the rear panel. If the dosing relay remains continuously activated for more than selected dosing time the alarm relay is activated, the alarm LED is blinking and the dosing relay is 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  1, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected)
Setpoint Range  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
Consent Relay  1, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected)
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