Instruction Manual HI 8043 Portable Dissolved Oxygen Meter DO me ter HI 804 3 STB OFF °C O2 ZERO SLOPE °C ins rum ns This Instrument is in Compliance with the CE Directives 1 Dear Customer, Thank you for choosing a Hanna Instruments Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with all the necessary information for the correct use of the instrument, as well as a more precise idea of its versatility in a wide range of applications. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com. This instrument is in compliance with the directives. TABLE OF CONTENTS Preliminary Examination ............................. 3 General Description .................................... 3 Functional Description Probe ...................... 4 Functional Description Meter ...................... 5 Specifications ............................................. 6 Initial Probe Preparation ............................. 7 Dissolved Oxygen Calibration ..................... 9 Temperature Calibration ............................ 15 Taking Measurements .............................. 16 Probe & Membrane Maintenance ............. 17 Battery Replacement ................................ 19 Accessories .............................................. 20 Warranty ................................................... 21 CE Declaration of Confirmity .................... 22 2 PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it to make sure that no damage has occurred during shipping. If there is any damage, notify your Dealer. Each · · · · · · · · · meter is supplied with: DO Meter DO Probe (HI 76401) Membrane cap (2 pcs) O-ring (2 pcs) Protective cap 30 mL electrolyte solution (HI 7041S) Screwdriver for calibration purposes 1 x 9V battery Instruction manual Note: Save all packing material until you are sure that the instrument functions correctly. All defective items must be returned in the original packaging with the supplied accessories. GENERAL DESCRIPTION HI 8043 is a portable meter for Dissolved Oxygen measurements. It is housed in a lightweight case, with an easy-to-read LCD. Dissolved oxygen and temperature measurements can be performed in the field (wastewater treatment, fish-farming, water analysis, etc.) as well as in the laboratory without compromising accuracy. Dissolved oxygen is indicated in mg/l (ppm) and this value is compensated for the temperature effect (ATC). The dissolved oxygen probe has a membrane covering the polarographic sensors and a builtin thermistor for temperature measurements and compensation. The thin permeable mem3 brane isolates the sensor elements from the sample tested, but allows oxygen to enter. A voltage is applied across the sensor, and the oxygen that has passed through the membrane reacts causing the current to flow, hence determining a reading. A convenient feature of the instrument is its standby mode which keeps the probe polarized and ready for instant measurements. FUNCTIONAL DESCRIPTION PROBE 1. 2. 3. 4. 5. 6. 7. 8. 9. D.O. Probe Protective Cap Watertight Shielded Cable Probe Body O-Ring Seal Silver Chloride Anode Platinum Cathode (sensor) Oxygen Permeable PTFE Membrane Membrane Cap 4 FUNCTIONAL DESCRIPTION 1 3 2 DO meter HI 8043 STB OFF °C 4 O2 5 9 6 7 ZERO SLOPE °C 8 ins rum n s 1.Liquid Crystal Display 2."OFF" (to switch the meter off) 3."STB" (to switch the meter on and polarize the probe. Use this standby position without switching the meter off if you are going to take further measurements) 4."°C" Measurement 5."O2" Measurement 6.ZERO Calibration Trimmer 7.SLOPE Calibration Trimmer 8.°C Calibration Trimmer 9.Rotary Switch 5 SPECIFICATIONS Range Resolution Accuracy DO °C DO °C DO °C 0.00 to 19.99 mg/l 0.0 to 50.0°C (32 to 122 °F) 0.01 mg/l 0.1°C ±1.5% of full scale ±0.5°C ±1.5% of full scale ±1°C Manual on 2 points Automatic from 0 to 30°C (32 to 86°F) HI 76401 polarographic with 3 m cable 9V / 100 hours of continuous use 0 to 50°C (32 to 122°F); 95% RH 180 x 83 x 40 mm (7.1 x 3.3 x 1.6") 650 g (23 oz.) with probe and soft carrying case Typical EMC DO Deviation °C Calibration Temperature Compensation Probe Battery Environment Dimensions Weight 6 INITIAL PROBE PREPARATION PROBE PREPARATION All probes shipped from Hanna Instruments are dry. To hydrate the probe and prepare it for use, connect it to the meter and proceed as follows. 1 Remove the red and black Shipping cap plastic cap. This cap is for shipping purposes and can be thrown away. black 2 Wet the sensor by soaking the bottom 2½ cm (1") of the probe in electrolyte red (HI 7041S) for 5 minutes. 3 Rinse the supllied membrane (HI 76407A) with electrolyte while shaking it gently. Refill with clean electrolyte. 4 Gently tap the sides of the membrane with your finger tip to ensure that no air bubbles remain trapped. To avoid damaging the membrane, do not tap the membrane directly on the bottom. 5 Make sure that the rubber O-ring sits properly inside the membrane cap. 6 With the sensor facing down, screw the cap clockwise. Some electrolyte will overflow. When not in use, place the protective cap supplied in the kit with the meter. 7 PROBE POLARIZATION When the probe is under polarization it is continuously fed with a voltage of approximately 800 mV. Probe polarization is essential for stable measurements to be taken with the same recurring degree of accuracy. In the presence of the polarized probe, oxygen is continually "consumed" by passing through the sensitive diaphragm and dissolving in the electrolyte solution contained in the probe. If this operation is interrupted, the electrolyte solution continues to be enriched with oxygen until it reaches an equilibrium with the surrounding solution. Whenever measurements are taken with a non-polarized probe, the oxygen level detected by the meter is both that of the tested sample as well as the oxygen present in the electrolyte solution itself. STB °C O By leaving the instrument in OFF the "STB" mode, which signifies keeping the probe in a continual state of polarization, the oxygen which is present in the electrolyte solution is progressively "consumed", and the following measurements detect only the quantity of oxygen present in the sample to be tested. Therefore, in order to keep the probe continuously polarized it is necessary to switch the meter to the "STB" mode and wait for at least 30 minutes. This should be done with the probe covered with the protective cap and filled with some electrolyte solution. 2 Polarization is not maintained when the instrument is switched to the "OFF" position. STB OFF °C O2 8 DISSOLVED OXYGEN CALIBRATION The calibration should be verified: - After approximately 20 hours of use. - Whenever the electrolyte or membrane is changed and after cleaning the electrode. - After excessive use in aggressive solutions. Accessories: - 200 cc of HI 7040 solution - 1 bottle of HI 7041 solution Procedure for calibration at sea level: · If you are starting from STB the "OFF" position, switch OFF to "STB" and wait 30 minutes for complete polarization of the probe before proceeding to the calibration procedure. ZERO CALIBRATION: · Switch from "STB" position to "O2" position. · Remove the protective cap and immerse the probe in the HI 7040 zero oxygen solution and wait for approximately 5 minutes. The indications given by the instrument must fall to stabilization levels. If the probe has not been sufficiently polarized, the readout will continue to fluctuate. °C O2 STB OFF °C O2 · 9 · In this case, switch back STB °C O to "STB" position, place OFF the protective cap and wait for a few hours for complete polarization before proceeding. Using a small screwdriver, turn the Zero Calibration screw until the display reads zero. 2 ZERO SLOPE °C · If the zero point is passed, "1" will appear on the display. If you cannot get zero reading the probe is probably defective, in which case you should check the membrane, electrode and electrolyte solution (see below). Rinse the probe thoroughly with normal tap water after the zero calibration has been completed. SLOPE CALIBRATION: In order to perform a highly accurate calibration, take a B.O.D. bottle and then fill with water to a depth of 1 or 2 cm (½ or ¾"), then seal the bottle with the probe inside. If this calibration is to be carried out with the bottle opened to air rather than according to the conditions described above, the margin of error is approximately 0.1 ppm. · Switch the instrument to "°C", wait for readings to stabilize and then note the temperature of the water. 10 STB OFF °C O2 · · Refer to Table 1 on page 10 for the corresponding dissolved oxygen reading at that temperature. Switch to "O2" position STB °C and adjust the "Slope" OFF O trimmer until the correct reading is displayed; e.g. at 20.5°C the trimmer should be adjusted until display reads 9.08. 2 ZERO SLOPE °C CORRECTION FOR ALTITUDE EFFECT If the calibration is not performed at sea level a correction should be made for the difference in altitude according to Table 2 on page 11; e.g. if calibrated at 20.5°C at an altitude of 300 m above sea level, the display should be adjusted to 9.08 x 0.96 = 8.72. ZERO SLOPE °C CORRECTION FOR SALINITY EFFECT Another correction has to be performed if the sample presents significant salinity concentrations. In such case, the reading has to be adjusted according to Table 3 on page 12; e.g. if calibrated at 20.5°C and the sample has a salinity content of 3 g/l, the display should be set at 9.08 - (3 x 0.0478) = 8.94. ZERO SLOPE °C 11 Table 1 Dissolved Oxygen (ppm) in Fresh Water as a function of Temperature (°C) °C 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 0.0 14.62 14.23 13.84 13.48 13.13 12.80 12.48 12.17 11.87 11.59 11.33 11.08 10.83 10.60 10.37 10.15 9.95 9.74 9.54 9.35 9.17 8.99 8.83 8.68 8.53 8.38 8.22 8.07 7.92 7.77 7.63 7.50 7.40 7.30 7.20 7.10 7.00 6.90 6.80 6.70 6.60 6.50 6.40 6.30 6.20 6.10 6.00 5.90 5.80 5.70 5.60 0.1 14.58 14.19 13.80 13.45 13.10 12.77 12.45 12.14 11.84 11.56 11.31 11.06 10.81 10.58 10.35 10.13 9.93 9.72 9.52 9.33 9.15 8.97 8.82 8.67 8.52 8.36 8.21 8.06 7.91 7.76 7.62 7.49 7.39 7.29 7.19 7.09 6.99 6.89 6.79 6.69 6.59 6.49 6.39 6.29 6.19 6.09 5.99 5.89 5.79 5.69 5.59 0.2 14.54 14.15 13.77 13.41 13.06 12.74 12.42 12.11 11.81 11.54 11.28 11.03 10.78 10.55 10.33 10.11 9.91 9.70 9.50 9.31 9.13 8.96 8.80 8.65 8.50 8.35 8.19 8.04 7.89 7.74 7.60 7.48 7.38 7.28 7.18 7.08 6.98 6.88 6.78 6.68 6.58 6.48 6.38 6.28 6.18 6.08 5.98 5.88 5.78 5.68 5.58 0.3 14.50 14.11 13.73 13.38 13.03 12.70 12.39 12.08 11.79 11.51 11.26 11.01 10.76 10.53 10.30 10.09 9.89 9.68 9.48 9.30 9.12 8.94 8.79 8.64 8.49 8.33 8.18 8.03 7.88 7.73 7.59 7.47 7.37 7.27 7.17 7.07 6.97 6.87 6.77 6.67 6.57 6.47 6.37 6.27 6.17 6.07 5.97 5.87 5.77 5.67 5.57 0.4 14.46 14.07 13.70 13.34 13.00 12.67 12.36 12.05 11.76 11.49 11.23 10.98 10.74 10.51 10.28 10.07 9.87 9.66 9.46 9.28 9.10 8.93 8.77 8.62 8.47 8.32 8.16 8.01 7.86 7.71 7.58 7.46 7.36 7.26 7.16 7.06 6.96 6.86 6.76 6.66 6.56 6.46 6.36 6.26 6.16 6.06 5.96 5.86 5.76 5.66 5.56 0.5 0.6 14.43 14.39 14.03 14.00 13.66 13.62 13.31 13.27 12.97 12.93 12.64 12.61 12.33 12.29 12.02 11.99 11.73 11.70 11.46 11.43 11.21 11.18 10.96 10.93 10.72 10.69 10.49 10.46 10.26 10.24 10.05 10.03 9.84 9.82 9.64 9.62 9.44 9.43 9.26 9.24 9.08 9.06 8.91 8.89 8.76 8.74 8.61 8.59 8.46 8.44 8.30 8.28 8.15 8.13 8.00 7.98 7.85 7.83 7.70 7.69 7.57 7.55 7.45 7.44 7.35 7.34 7.25 7.24 7.15 7.14 7.05 7.04 6.95 6.94 6.85 6.84 6.75 6.74 6.65 6.64 6.55 6.54 6.45 6.44 6.35 6.34 6.25 6.24 6.15 6.14 6.05 6.04 5.95 5.94 5.85 5.84 5.75 5.74 5.65 5.64 5.55 5.54 0.7 14.35 13.96 13.59 13.24 12.90 12.58 12.26 11.96 11.67 11.41 11.16 10.91 10.67 10.44 10.22 10.01 9.80 9.60 9.41 9.22 9.04 8.88 8.73 8.53 8.53 8.27 8.12 7.97 7.82 7.67 7.54 7.43 7.33 7.23 7.13 7.03 6.93 6.83 6.73 6.63 6.53 6.43 6.33 6.23 6.13 6.03 5.93 5.83 5.73 5.63 5.53 0.8 14.31 13.92 13.55 13.20 12.87 12.54 12.23 11.93 11.65 11.38 11.13 10.89 10.65 10.42 10.19 9.99 9.78 9.58 9.39 9.21 9.03 8.86 8.71 8.56 8.41 8.25 8.10 7.95 7.80 7.66 7.53 7.42 7.32 7.22 7.12 7.02 6.92 6.82 6.72 6.62 6.52 6.42 6.32 6.22 6.12 6.02 5.92 5.82 5.72 5.62 5.52 0.9 14.27 13.88 13.52 13.17 12.83 12.51 12.20 11.90 11.62 11.36 11.11 10.85 10.62 10.39 10.17 9.97 9.76 9.56 9.37 9.19 9.01 8.85 8.70 8.55 8.40 8.24 8.09 7.94 7.79 7.64 7.51 7.41 7.31 7.21 7.11 7.01 6.91 6.81 6.71 6.61 6.51 6.41 6.31 6.21 6.11 6.01 5.91 5.81 5.71 5.61 5.51 12 Table 2 Correction for measurements at different altitude ALTITUDE (METERS) Sea level 50 100 150 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 ATMOSPHERIC PRESSURE KPa 101.3 100.7 100.1 99.4 98.8 97.6 96.4 95.2 94.0 ...