User manual HANNA INSTRUMENTS HI 9912

[. . . ] Instruction Manual HI 9912 Wall Mounted Dual pH/ORP Controller HI 99 pH ACID 3 pH 1 OFFSET SLOPE ON 0 ALAR 2 M 100 0. 5 1. 5 0 2. 0 pH 0 PROPOR TIONAL SECOND S SETTIN GS OFF ALARM 2 SET 0 mV 200 2. 5 5 7. 5 90 1 UTE pH TIM S MIN 10 ER ALAR M ORP mV CAL SET mV AL RDX 300 FE pH SET 100 ORP 50 150 0 mV PROP 200 0 ORTIO NA SE L SE CONDS TTING S ON SET 50 ALA OFF RM 5 7. 5 2. 5 90 1 ORP UTES TIM MIN 10 LINE ER http://www. hannainst. com These Instruments are in Compliance with the CE Directives Dear Customer, Thank you for choosing a Hanna Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for a correct use of the instrument, as well as a more precise idea of its versatility. If you need more technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] The actual pH and ORP values will be ORP 650 displayed on the LCD's. mV HI 9912 provides for visual dosing status through two LED's, one for pH and another for ORP. The LED's light up when the controller is in the pH or ORP dosage mode and the terminals are activated. pH ACID 7 ALARM FEED mV OXID 700 ALARM FEED 6 8 500 SET 900 SET NOTE: HI 9912 provides for two separate relays, one for pH and another for ORP. In order to save on chemicals and due to the slow reaction of oxidants, the controller incorporates a Consent feature by which ORP measurements are adjusted only after pH has been corrected. The Consent feature makes the pH correction the master and the ORP adjustment the salve for a better control. 12 pH CALIBRATION Make sure that the pH electrode and any ground probe have been properly connected and wired to the controller (see preceding pages) and that the meter is plugged to the mains. Calibration should be performed at a temperature similar to that of the liquid to be monitored. Use a Checktemp (or an accurate thermometer) as reference. Remove the electrode cap if it is still on the electrode. 4 cm (1½") HI 7007 During calibration, move the electrode and the separate ground probe (if in use) together from one buffer to the next. HI 7007 If no separate ground probe is being used, make sure that the Reference and the Matching Pin terminals are shorted (see 14 - Functional Diagram). If the electrode (such as HI 1003/3) incorporates a ground probe (matching pin) then remove the jumper. 4 cm (1½") OFFSET ADJUSTMENT: · Rinse the tip of the electrode with pH 7. 01 solution (HI 7007), then dip the bottom 4 cm (1. 5") of the electrode (and ground probe) in the pH 7. 01 buffer. · Place the Checktemp thermometer in the buffer solution. 4 cm (1½") HI 7007 · Wait for the measurement to stabilize and then adjust the "OFFSET" trimmer (see 6 - Func- pH tional Diagram) to display pH 7. 01 on the LCD if the temperature of the buffer solution is at 25°C (77°F). · If the temperature of the buffer solution is not 25°C (77°F), refer to the chart at the end of the manual for the appropriate buffer value at a given temperature. 7. 01 SLOPE ON OFFSET ALARM OFF 13 SLOPE ADJUSTMENT: · Rinse the electrode (and ground probe) thoroughly with water and immerse the bottom 4 cm (1. 5") in a pH 10. 01 (HI 7010) or a pH 4. 01 (HI HI 7010 7004) buffer solution. · Stir the electrode and wait for the display to stabilize before adjusting the "SLOPE" trimmer (see 5 - Functional Diagram) to display pH pH 10. 01 (or 4. 01) on the LCD if the temperature of the buffer solution is at 25°C (77°F). Otherwise, refer to the chart at the end of the manual for the buffer value and adjust the trimmer accordingly. The pH calibration is now complete. 10. 01 SLOPE ON 4 cm (1½") OFFSET ALARM OFF ORP CALIBRATION Make sure that the ORP electrode and any ground probe have been properly connected and wired to the controller (see preceding pages) and that the meter is plugged to the mains. Remove the electrode cap if it is still on the electrode. During calibration, introduce both the electrode and the separate ground probe (if in use) to the known solution. If no separate ground probe is being used, make sure that the Reference and the Matching Pin terminals are shorted (see 15 - Functional Diagram). If the electrode (such as HI 2003/3) incorporates a ground probe (matching pin) then remove the jumper. · Immerse the electrode in a HI 7020 (or another known) ORP solution and wait until the reading stabilizes. · Adjust the CAL trimmer to 230 ±20 mV. ORP mV 4 cm (1½") CAL 230 ON ALARM OFF HI 7020 14 ADJUSTEMENT OF SETPOINT(S) Make sure that the electrode (and any ground probe) is properly installed and calibrated (see the preceding pages). FOR pH Simply turn the pH ACID FEED dial (see 3 - Functional Diagram) and choose the desired value between 6 and 8 pH. pH ACID 7 ALARM FEED DOSING DIRECTION 6 8 SET The dosing terminals are activated when the pH value exceeds the setpoint. HI 9912 will then dose acidic solutions until the user-selected setpoint is reached. FOR ORP Simply turn the ORP OXID FEED dial (see 11 Functional Diagram) and choose the desired value between 500 and 900 mV mV OXID 700 ALARM FEED 500 SET 900 DOSING DIRECTION The dosing terminals are activated when the ORP falls below the setpoint. HI 9912 will dose oxidants until the user-selected setpoint is reached. PROPORTIONAL CONTROL In order to optimize the controlling process and reduce the amount of chemicals used, it is recommended to use a proportional dosage appropriate for the system. [. . . ] You can now connect your meter directly to an AmpHel electrode, saving the cost of a transmitter. The standard cable length of the AmpHel electrode is 5 m (16. 5'). Additional lengths of regular cable up to 50 m (165'), can be installed without special connectors. It is recommended to use coaxial cables due to their excellent insulation, even though, Amphel electrodes can operate with both. [. . . ]