User manual HANNA INSTRUMENTS WM 8910

[. . . ] Instruction Manual WM 8910 - WM 8911 WM 8912 - WM 8913 WM 8920 - WM 8923 WM 8930 Wall Mounted ORP - pH - Conductivity Controllers 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. [. . . ] 220/240V 50/60Hz 110/115V 50/60Hz ALARM CONTACT POWER SUPPLY POWER SUPPLIES FOR DOSING ENVIRONMENT PROTECTION WEIGHT ENCLOSURE MATERIAL One plug for the high or low conductivity dosage (115 or 220V, depending on the model, Max. 2A, 1, 000, 000 strokes) -10 to 50°C (14 to 122°F) max 85% RH non-condensing IP54 1. 6 Kg (3. 5 lb. ) 181 x 221 x 142mm (7. 1 x 8. 7 x 5. 6") Housed in rugged, fiber-reinforced polypropylene case · Connect the power cable (HI 767/P) to the input voltage supply socket on the bottom of the meter (see functional description). · Connect the pH or/and ORP electrode(s) to the BNC socket(s) provided (for WM 8912 only, the BNC for the pH electrode is on the left and the BNC for the ORP one on the right) and located on the bottom of the meter. · Connect the HI 7637 conductivity probe to the DIN socket (for WM 8913, WM 8923 and WM 8930) located on the bottom of the meter, by aligning the pins with the socket, pushing the plug in and tightening the threaded ring. · Connect the external device/s (a pump or an electrovalve) through HI 7671 output plug to the output socket/s (just one for WM 8910, WM 8920 and WM 8930 or two for WM 8911, WM 8912, WM 8913, WM 8923) located on the bottom of the meter. The selected operation will be activated by the gauge relay/s (see page 31 for more information). ALARM & RECORDER CONNECTIONS · If the reading drifts from the setpoint as specified on the next page or if the unit loses power an external alarm is activated. It can be selected normally closed ("NC") by connecting the external device to the C and NC terminals or normally open ("NO") by connecting the external device to the C and NO terminals. 22 23 When activated, the alarm contacts will open or close, triggering the mechanism of your choice, whether a buzzer, light or any other electrical devices (the alarm is a necessity specially with installation in remote locations or when corrective action must be taken immediately). TEMPERATURE COMPENSATION (for WM 8910 and WM 8911 only) · Manual temperature compensation can be selected by shorting the MTC to the middle terminal. The temperature is then to be manually adjusted with the temperature dial. Model WM 8910 WM 8911 WM 8912 WM 8913 WM 8920 WM 8923 WM 8930 Alarm is activated when the reading varies: ±2. 0 pH from the setpoint -2. 0 pH lower than the SET LO or +2. 0 pH higher than the SET HI ±2. 0 pH from the setpoint; ±200 mV from the setpoint ±2. 0 pH from the setpoint; ±0. 5 mS/cm from the setpoint ±200 mV from the setpoint ±2. 0 pH from the setpoint; ±0. 5 mS/cm from the setpoint ±500 µS/cm from the setpoint · Automatic temperature compensation can be selected by shorting the ATC and the middle terminal. Cut off the connector of a HI 7669/2W temperature probe (optional). Strip the two wires and connect them to the "°C sensor" terminals of the output contacts. · The recorder output terminals (for WM 8910, WM 8911, WM 8920 and WM 8930 only) are isolated from the controller circuitry to avoid any interference. They are user-switchable between 0 to 20 mA or 4 to 20 mA as shown below and are proportional to the measured pH, ORP or conductivity values. TAKING MEASUREMENTS Make sure that the controller together with the electrode or probe has been calibrated before operating the instruments (see following pages). Adjust the pH, ORP or conductivity setpoint(s) following the instructions on page 31. Immerse the electrode and/or probe in the test solution and set the switch to "MEASURE" (for WM 8910, WM 8911, WM 8920 and WM 8930 only). OR The actual pH, ORP or conductivity value of the test solution will be displayed. 24 25 When the meter is in pH dosage mode and the terminals are activated, the DOSE LED will be lit (for WM 8912, WM 8913 and WM 8923 only). pH CALIBRATION (for WM 8910, WM 8911, WM 8912, WM 8913, WM 8923 only) Make sure a combination pH electrode is connected to the BNC socket and the meter is plugged to the mains. Turn the switch to the "MEASURE" position. The calibration should be ideally performed at the temperature of the liquid that is being controlled. Use a ChecktempC (or an accurate thermometer) as reference for a temperature compensated calibration. Likewise for the DOSE LED of the ORP controller WM 8912. OFFSET ADJUSTMENT: Similarly, DOSE LED of WM 8913 and WM 8923 will be lit when conductivity terminals are activated. Note: When both the LEDs are lit up simultaneously, the pH dosage is given priority over ORP/conductivity dosage. °C · Remove the protective cap from the electrode, rinse it with some pH 7. 01 solution (HI 7007), then dip it in pH 7. 01 buffer. Note: The electrode should be submerged approximately 4 cm (1½") into the solution. The thermometer should be located close to the pH electrode. For WM 8910 and WM 8911 only: · Short the MTC and the middle terminals and adjust the "°C" knob to the temperature of the solution (e. g. 25°C). 4 cm (1½") HI 7007 · Stir the electrode and wait about one minute before adjusting the "OFFSET" or the "pH7" trimmer 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 on page 37 for the appropriate buffer value at a given temperature. 26 27 SLOPE ADJUSTMENT: °C · Rinse the electrode thoroughly in water and immerse it in pH 4. 01 (HI 7004) or pH 10. 01 (HI 7010) buffer solution. Note: Use pH 4. 01 if you are going to measure acidic samples or pH 10. 01 for alkaline measurements. [. . . ] AmpHel® electrodes have a micro-amplifier in the electrode cap to boost the signal, drastically reducing susceptibility to noise and drift. With all of the components sealed in the electrode body, moisture up to 100% RH will not effect the signal. MAXIMUM 50 METERS CONDUCTIVITY PROBE MAINTENANCE & CLEANING The probe can be compensated for normal contamination by a process of re-calibration. However, it is recommended that the process conductivity probe be removed from the system regularly for maintenance. If a more thorough cleaning is desired, unscrew the PVC sleeve and clean the sensors with a non-abrasive cloth and alcohol. [. . . ]