User manual HANNA INSTRUMENTS HI 8711

[. . . ] Instruction Manual HI 8510 · HI 8512 HI 8710 · HI 8711 HI 8720 Panel Mounted pH and ORP Indicators and Controllers ORP HI 8720E mV DOSAGE OXID. REDUC. SLOPE AL MEA SURE SET COARSE SET FINE AL 0 mV TEST 500 mV TEST www. hannainst. com 0£ 1 PRELIMINARY EXAMINATION Dear Customer, Thank you for choosing a HANNA instruments® product. Please read this instruction manual carefully before using the instrument. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] Note: For accurate readings, use pH 4. 01 if you are going to measure acid samples or pH 10. 01 for alkaline measurements. Shake briefly and wait one minute before adjusting the slope trimmer to display the ph value of the buffer solution, i. e. pH 4. 01 (or 10. 01) at 25°C (77°F). °C 4 cm (1½") HI 7007 DOSAGE SLOPE ACID BASE O MEA SURE SET COARSE pH SET FINE °C HI 7004 If the buffer solution temperature is different from 25°C (77°F), refer to the "pH vs. temperaturare" chart on page 36 for the appropriate pH value at the noted temperature. Note: If a Pt100 temperature sensor is used, immerse it into the buffer solutions during calibration. Shake briefly and wait one minute before adjusting the 0 trimmer to display the buffer solution value, i. e. "pH 7. 01" at 25°C (77°F). DOSAGE SLOPE 4 cm (1½") ACID BASE O MEA SURE SET COARSE pH SET FINE If the buffer solution temperature is different from 25°C (77°F), refer to the "pH vs. temperaturare" chart on page 36 for the appropriate pH value at the noted temperature. 34 34£ 35 pH VALUES AT VARIOUS TEMPERATURE Temperature has an effect on the pH. The calibration buffer solutions are affected by temperature changes to a lesser degree than normal solutions. Please refer to the following chart to perform the pH calibration: pH DIAGNOSTIC TESTS TEMP °C °F 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 32 41 50 59 68 77 86 95 104 113 122 131 140 149 158 4. 01 4. 01 4. 00 4. 00 4. 00 4. 00 4. 01 4. 02 4. 03 4. 04 4. 05 4. 06 4. 07 4. 09 4. 11 4. 12 6. 86 6. 98 6. 95 6. 92 6. 90 6. 88 6. 86 6. 85 6. 84 6. 84 6. 83 6. 83 6. 84 6. 84 6. 85 6. 85 pH VALUE 7. 01 9. 18 7. 13 7. 10 7. 07 7. 04 7. 03 7. 01 7. 00 6. 99 6. 98 6. 98 6. 98 6. 98 6. 98 6. 99 6. 99 9. 46 9. 39 9. 33 9. 27 9. 22 9. 18 9. 14 9. 10 9. 07 9. 04 9. 01 8. 99 8. 97 8. 95 8. 93 10. 01 10. 32 10. 24 10. 18 10. 12 10. 06 10. 01 9. 96 9. 92 9. 88 9. 85 9. 82 9. 79 9. 77 9. 76 9. 75 HI 8510, HI 8710 and HI 8711 are provided with autodiagnostic functions that allow to check and troubleshoot any malfunctioning. The functions are made via front panel keys to isolate the cause of malfunction whether it is due to pH electrode contamination, internal offset circuit or amplifier circuit. First press the MEASURE key, then one of the following keys. MEA SURE COARSE SET FINE A) Sensor Test Immerse the electrode in pH 7. 01 buffer solution (HI 7007), press SENSOR TEST key and the display shows the mV response of the electrode. 4 cm (1½") HI 7007 SENSOR TEST mV For instance, if the buffer temperature is 25°C (77°F), calibrate to read on the display pH 4. 01 or 7. 01 or 10. 01. If the buffer temperature is 20°C, calibrate to read on the display pH 4. 00 or 7. 03 or 10. 06. If the buffer temperature is 50°C, calibrate to read on the display pH 4. 06 or 6. 98 or 9. 82. If the electrode is in good working condition, the value should be within ±30 mV. A value between 30 and 60 mV or -60 and -30 mV, indicates some contamination of the electrode. If the value is higher than 60 mV or lower than -60 mV, the contamination is too high and the electrode should be replaced. 36 36£ 37 B) Internal Offset Circuit Test Press the pH7 TEST key and the display should show a value within 7±1 pH, to verify the internal circuit of the meter in terms of the offset compensation. ORP DIAGNOSTIC TESTS pH 7 TEST pH HI 8512 and HI 8720 are ORP controllers provided with autodiagnostic functions that allow to check and troubleshoot any malfunctioning. The functions are made via front panel keys to isolate the cause of malfunction. For HI 8720 only, press MEASURE key before proceeding with the following tests. MEA SURE C) Amplifier Circuit Test Press the pH4 TEST key and the display should show a value within the 3. 30 to 4. 30 pH range, to verify the amplifier circuit of the meter. COARSE SET FINE A) pH 4 TEST pH 0 mV Test Press the 0 mV TEST key and the display should show a value of 0±10 mV, to verify the "zero" calibration of the instrument. mV 0 mV TEST 500 mV TEST B) 500 mV Test Press the 500 mV TEST key and the display should show a value of 500±20 mV, to verify the slope at 500 mV. mV 0 mV TEST 500 mV TEST 38 38£ 39 LED INDICATION All LEDs above the keys indicate the state of each function, whether it is active or the display is indicating the mode. For HI 8711 only Each LED can be in one of the following states: A) Light on The mode is displayed on the LCD but is not active, e. g. the alarm setpoint is displayed but the alarm contact is open. TAKING REDOX MEASUREMENTS Redox measurements allow the quantification of the solution oxidizing/reducing power, and are commonly expressed in mV. Oxidation may be defined as the process during which a molecule (or an ion) loses electrons and reduction as the process by which electrons are gained. Oxidation is always coupled together with reduction, so that as one element gets oxidized, the other is automatically reduced, therefore the term oxidation-reduction is frequently used. Redox potentials are measured by an electrode capable of absorbing or releasing electrons without causing any chemical reaction. [. . . ] This type of connection is very delicate and requires constant attention to maintain proper operating conditions. Conventional electrodes should be used in indoor applications only, with a cable not longer than 10 m (33'). MAXIMUM 10 METERS DRY ENVIRONMENT LESS THAN 80% RELATIVE HUMIDITY pH METER pH-ORP METER WITH CONVENTIONAL ELECTRODES MEASUREMENTS CAN BE TAKEN FROM DISTANCES UP TO 10 METERS (33 FEET) MEDIUM DISTANCE, INDOOR/OUTDOOR INSTALLATION When an outdoor installation is required, to obtain accurate readings at distances from 10 to 50 m (33-165'), it is necessary to install a transmitter. Since the introduction of AmpHel® electrodes, these distances are no longer a problem. You can now connect the meter directly to an AmpHel® electrode, saving the cost of a transmitter or expensive coaxial cable. [. . . ]