ORP solutions begin on page 2.170 HI8720 ORP Analog Controller with Self-Diagnostic Test • 10 to 300 mV alarm tolerance range • Backlit, LCD displayy • Removable, transparent splash-proof cover protects the front panel. This instrument allows the selection of a set point for oxidizing or reducing dosage. When used in conjunction with the HI8710 pH controller, the ODCD (ORP dosing consent device) function (featured by the HI8710) will ensure that the ORP dosage will start only when the pH level is correct. Each model accepts either a direct input from an ORP electrode or from a transmitter through 4-20 mA input. The instrument also provides ±5V power output and input terminals for amplified electrodes. Moreover, you can choose the output configuration for connecting a recorder or a PLC, between 0-20 or 4-20 mA. 1. BNC socket for ORP electrode 2. Input from amplified electrode 3. Oxid/Reduc dosage consent terminals 4. Connections for dosing pump 5. Alarm contacts 6. Power supply terminals 7. Fuse holder 8. OXID/RED. dosage selection terminals 9. Recorder output contacts 10. Connections to the transmitter 11. Power for amplified electrode 12. Connection for matching pin 13. Connection for reference electrode 14. Disable overtime connection 15. Overtime set knob (about 5 to 60 min) Specifications HI8720 Range ±1999 mV Resolution 1 mV Accuracy (@25°C/77°F) ±5 mV; ±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: ±200 mV with CAL trimmer; Recorder Output 0-20 mA or 4-20 mA (isolated) Set Point Relay 1, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected) Set Point Range ±1999 mV Alarm Relay 1, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected) Alarm Range 10 to 300 mV 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.) Ordering Information The HI8720 is supplied complete with mounting brackets and instructions. Accessories HI8427 pH / ORP electrode simulator HI8615N ORP transmitter HI8615LN ORP transmitter with display 15 Process Instrumentation 15.77 www.hannainst.com | controllers
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