Specifications HI8711 Range 0.00 to 14.00 pH Resolution 0.01 pH Accuracy (@25°C/77°F) ±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) Set Point Relay 2, isolated, 2 A, max 240 V, resistive load, 1000000 strokes (not fuse protected) Set Point 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.) Ordering Information The HI8711 is supplied complete with mounting brackets and instructions. Accessories HI8427 pH / ORP electrode simulator HI931001 pH / ORP electrode simulator with display HI8614N pH transmitter HI8614LN pH transmitter with display HI8711 pH Analog Controller with Dual Output and Self-Diagnostic Test • 0.2 to 3.00 pH alarm tolerance range • Automatic temperature compensation • Backlit, LCD display • A removable, transparent splash-proof cover protects the front panel. HI8711 allows the selection of two set points with two independent outputs for acid and alkaline dosages. HI8711 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 HI8711 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. pH solutions begin on page 2.158 1. BNC socket for pH electrode 2. Input from amplified electrode 3. Connections for Pt100 temperature sensor 4. Connections for dosing pump for acid 5. Connections for dosing pump for base 6. Alarm contacts 7. Power supply terminals 8. Fuse holder 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) 15 Process Instrumentation 15.76 | www.hannainst.com controllers
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