Hanna Instruments HI2211-01,HI2210-01 Instruction manual
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Instruction Manual HI2210 HI2211 Microprocessor-based pH/mV/°C Bench Meters www.hannainst.com 1 Dear Customer, Thank you for choosing a Hanna Instruments Office product. Please read this instruction manual carefully before using these instruments. This manual will provide you with the necessary information for correct use of these instruments, as well as a precise idea of their versatility. If you need additional technical information, do not hesitate to e-mail us at [email protected] or view our worldwide contact list at www.hannainst.com. All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner. 2 TABLE OF CONTENTS PRELIMINARY EXAMINATION .........................................................4 GENERAL DESCRIPTION .................................................................4 FUNCTIONAL DESCRIPTION.............................................................5 SPECIFICATIONS ...........................................................................6 OPERATIONAL GUIDE.....................................................................7 pH CALIBRATION.........................................................................10 TEMPERATURE CALIBRATION (for technical personnel only)............13 pH BUFFER TEMPERATURE DEPENDENCE......................................15 ELECTRODE CONDITIONING AND MAINTENANCE.............................16 TROUBLESHOOTING GUIDE .........................................................19 TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS................20 ACCESSORIES..............................................................................21 3 PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any damage, please contact your local Hanna Instruments Office. Each instrument is supplied with: • HI1131B Glass-body Combination pH Electrode • HI7662 Temperature Probe • HI76404N Electrode Holder • pH4.01 & 7.01 Buffer Solutions, 20 mL each • HI7082 Electrolyte Solution • HI700661 Cleaning Solution • 12 VDC Power Adapter • Instruction Manual • Quality Certificate Note: Save all packing material until you are sure that the instrument functions correctly. All defective items must be returned in the original packing with the supplied accessories. GENERAL DESCRIPTION The Hanna Instruments HI2210 and HI2211 are microprocessor based pH and temperature bench meters. HI2211 can also be used for ion concentration (ISE) and Oxidation Reduction Potential (ORP) in the mV range. pH measurements are compensated for temperature effect manually or automatically with the HI7662 temperature probe. The instrument is equipped with a large easy-to-read LCD which shows the pH (or mV) and temperature simultaneously, together with graphic symbols. A stability indicator makes the calibration procedure error free. 4 FUNCTIONAL DESCRIPTION Front Panel Rear Panel 10 11 On pH/ORP Off Ref. TEMP Power 12Vdc 12 13 14 1) 2) 3) 4) Liquid Crystal Display (LCD). CAL key, to enter and exit calibration mode. CFM key, to confirm different values. °C and °C keys, to manually increase/decrease temperature or select pH buffer. 5) RANGE key, to select measurement range (HI2211 only). 6) MEM key, to store a value into memory. 7) MR key, memory recall. 8) Secondary LCD. 9) Primary LCD. 10) ON/OFF switch. 11) Power adapter socket. 12) BNC electrode connector. 13) Temperature probe socket. 14) Electrode reference socket. 5 SPECIFICATIONS –2.00 to 16.00 pH Range ±399.9 mV (HI2211 only) ±2000 mV (HI2211 only) –20.0 to 120.0 °C 0.01 pH Resolution 0.1 mV (HI2211 only) 1 mV (HI2211 only) 0.1 °C ±0.01 pH Accuracy @20 °C / 68 °F ±0.2 mV (HI2211 only) ±1 mV (HI2211 only) ±0.4 °C (excluding probe error) pH Calibration Automatic, 1 or 2 point with 5 memorized buffer values (pH4.01, 6.86, 7.01, 9.18, 10.01) Temperature compensation Automatic (with HI7662 probe) or Manual from: –20.0 to 120.0 °C pH Electrode HI1131B (included) Temperature probe HI7662 (included) Input impedance 1012 Ohms Power supply 12 VDC adapter (included) Environment 0 to 50 °C (32 to 122 °F) max. 95% RH non-condensing Dimensions 235 x 222 x 109 mm (9.2 x 8.7 x 4.3”) Weight 1.3 Kg (2.9 lbs) Warranty 2 years 6 OPERATIONAL GUIDE POWER CONNECTION Plug the 12 VDC adapter into the power supply socket. Notes: These instruments use non volatile memory to retain the pH, mV, temperature calibrations and all other settings, even when unplugged. Make sure a fuse protects the main line. ELECTRODE AND PROBE CONNECTIONS For pH or ORP combination electrode connect to the BNC connector on the back of the instrument. For electrodes with a separate reference connect the electrode’s BNC to the BNC connector and the reference electrode plug to the reference socket. For temperature measurements and automatic temperature compensation connect the temperature probe to the appropriate socket. INSTRUMENT START-UP • Turn the instrument on by pressing the ON/OFF switch located on the rear panel. • All LCD segments are displayed while the instrument performs a self test. pH MEASUREMENTS Make sure the electrode and the instrument have been calibrated together before taking pH measurements. • Submerse the electrode and the temperature probe approximately 3 cm (1¼”) into the sample to be tested and stir gently. Allow time for the electrode to stabilize. • The pH is displayed on the primary LCD and the temperature on the secondary LCD. • If the pH reading is out of range, the closest full scale value will be displayed blinking on the LCD. 7 If measurements are taken successively in different samples, it is recommended to rinse the electrode thoroughly with deionized water or tap water and then with some of the next sample in order to prevent cross-contamination. The pH reading is affected by temperature. In order to measure the pH accurately, the temperature effect must be compensated for. To use the Automatic Temperature Compensation feature, connect and submerse the HI7662 temperature probe into the sample as close as possible to the electrode and wait for a few seconds. If the temperature of the sample is known, manual temperature compensation can be used by disconnecting the temperature probe. The display will show the last recorded temperature reading with the “°C” tag blinking. The temperature can now be adjusted with the ARROW keys (from -20.0 °C to 120.0 °C). ORP MEASUREMENTS (HI2211 only) An optional ORP electrode must be used to perform ORP measurements (see Accessories). Oxidation-reduction potential (REDOX) measurements provide the quantification of the oxidizing or reducing power of the tested sample. The surface of the ORP electrode must be clean and smooth in order to obtain an accurate measurement. • Press RANGE to enter mV range. • Submerse the tip of the ORP electrode 3 cm (1¼”) into the sample to be tested and allow a few seconds for the reading to stabilize. • The instrument displays the mV reading on the primary LCD and the temperature on the secondary LCD. • If the reading is out of range, the closest full scale value will be displayed blinking on the LCD. 8 TEMPERATURE MEASUREMENTS Connect the HI7662 temperature probe to the TEMP socket and turn the instrument on. Submerse the temperature probe into the sample and allow the reading on the secondary LCD to stabilize. MEMORY FUNCTION Press and hold down MEM key to store the last reading in the meter’s memory. The “MEM” tag will be displayed. MR MEM Press MR (memory recall) key to display the memorized reading. The “MEM” tag will be displayed. 9 pH CALIBRATION Calibrate the instrument often, especially if high accuracy is required. The instrument should be recalibrated: • Whenever the pH electrode is replaced. • At least once a week. • After testing aggressive chemicals. PREPARATION Pour small quantities of the buffer solutions into clean beakers. If possible use plastic or glass beakers to minimize any EMC interferences. For accurate calibration and to minimize cross-contamination, use two beakers for each buffer solution: one for rinsing the electrode and one for calibration. If you are measuring in the acidic range, use pH7.01 or pH6.86 as first buffer and pH4.01 as second buffer. If you are measuring in the alkaline range, use pH7.01 or pH6.86 as first buffer and pH10.01 or pH9.18 as second buffer. PROCEDURE A two-point calibration is recommended however a one-point calibration will be permitted. Calibration can be performed using the five memorized buffers: • pH4.01, 6.86, 7.01, 9.18 and 10.01. TWO-POINT CALIBRATION • Submerse the pH electrode and the temperature probe approximately 3 cm (1¼”) into a buffer solution and stir gently. The temperature probe should be close to the pH electrode. • Press CAL. The “CAL” and “ ” messages will appear and “7.01” buffer will be displayed on the secondary LCD. CAL • If necessary, press the ARROW keys to select a different buffer value. • The “ ” symbol will blink on the LCD until the reading is stable. 10 • When the reading is stable and close to the selected buffer, “READY” message will appear and “CFM” message will blink. • Press CFM to confirm calibration. • The calibrated value is then displayed on the primary LCD and the secondary LCD will display CFM the second expected buffer value. • After the first calibration point is confirmed, submerse the pH electrode and the temperature probe approximately 3 cm (1¼”) into the second buffer solution and stir gently. The temperature probe should be close to the pH electrode. • If necessary, press the ARROW keys to select a different buffer value. Note: The instruments will automatically skip the buffer used for the first point. It also skips 6.86 if 7.01 buffer was used and vice versa. Likewise, it will skip 9.18 if 10.01 buffer was used and vice versa. • The “ ” symbol will blink on the LCD until the reading is stable. • When the reading is stable, “READY” message will appear and “CFM” message will blink. CFM • Press CFM to confirm calibration. The instrument will return to measurement mode. Notes: • To clear previous calibration data enter calibration mode, press and hold down CFM, then press CAL. The display will show “CLR” and then return to measurement mode. • If the value measured by the meter is not close to the selected buffer, “WRONG ” and “WRONG ” messages will blink alternately. In this case check if the correct buffer has been used, or regenerate the electrode by following the cleaning procedure (see page 18). If necessary, change the buffer or the electrode. 11 • The “WRONG” message and temperature value are displayed blinking if the temperature reading is out of the defined temperature range of the buffer. Calibration cannot be confirmed in this situation. • Press RANGE to display the temperature reading on the LCD RANGE during calibration (HI2211 only). ONE-POINT CALIBRATION • Proceed as described in “Two-point calibration” section. • Press CAL after the first calibration point CAL was confirmed. The instrument will return to measurement mode and will memorize the one-point calibration data (new offset). The instrument will use the slope from the previous calibration. The default slope will be used if there is no previous calibration. 12 TEMPERATURE CALIBRATION (for technical personnel only) All the instruments are factory calibrated for temperature. Hanna Instruments’ temperature probes are interchangeable and no temperature calibration is needed when they are replaced. If the temperature measurements are inaccurate, temperature recalibration should be performed. For an accurate recalibration, contact your local Hanna Instruments Office. • Prepare a vessel containing ice and water and another one containing hot water (around 50 ºC). Place insulation material around the vessels to minimize temperature changes. • Use a calibrated thermometer with a resolution of 0.1 ºC as a reference thermometer. • With the instrument off, press and hold down the CAL & MEM keys, then power on the instrument. The “CAL” message will appear and the secondary LCD will show “0.0 ºC”. • Submerse the temperature probe in the vessel with ice and water as near as possible to the reference thermometer. Allow a few seconds for the probe to stabilize. • Use the ARROW keys to set the reading on the secondary LCD to that of ice and water, measured by the reference thermometer. • When the reading is stable and close to the selected calibration point, “READY” message will appear and “CFM” message will blink. • To confirm press CFM. The secondary LCD will show “50.0 ºC”. CFM 13 • Submerse the temperature probe in the second vessel as near as possible to the reference thermometer. Allow a few seconds for the probe to stabilize. • Use the ARROW keys to set the reading on the secondary LCD to that of the hot water. • When the reading is stable and close to the selected calibration point, “READY” tag will appear and “CFM” tag will blink. • Press CFM to confirm. The instrument returns to measurement mode. CFM Note: If the reading is not close to the selected calibration point, “WRONG” tag will blink. Change the temperature probe and restart calibration. 14 pH BUFFER TEMPERATURE DEPENDENCE The temperature has an effect on pH. The calibration buffer solutions are affected by temperature changes to a lesser degree than normal solutions. During calibration the instrument will automatically calibrate to the pH value corresponding to the measured or set temperature. TEMP pH VALUES °C °F 4.01 6.86 7.01 9.18 10.01 0 32 4.01 6.98 7.13 9.46 10.32 5 41 4.00 6.95 7.10 9.39 10.24 10 15 50 59 4.00 4.00 6.92 6.90 7.07 7.05 9.33 9.27 10.18 10.12 20 68 4.00 6.88 7.03 9.22 10.06 25 77 4.01 6.86 7.01 9.18 10.01 30 86 4.02 6.85 7.00 9.14 9.96 35 95 4.03 6.84 6.99 9.11 9.92 40 104 4.04 6.84 6.98 9.07 9.88 45 113 4.05 6.83 6.98 9.04 9.85 50 122 4.06 6.83 6.98 9.01 9.82 55 131 4.08 6.84 6.98 8.99 9.79 60 140 4.09 6.84 6.98 8.97 9.77 65 149 4.11 6.84 6.99 8.95 9.76 70 158 4.12 6.85 6.99 8.93 9.75 During calibration the instrument will display the pH buffer value at 25 ºC. 15 ELECTRODE CONDITIONING AND MAINTENANCE PREPARATION PROCEDURE Remove the protective cap of the pH electrode. DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal with electrodes. They will disappear when rinsed with water. During transport, tiny bubbles of air may form inside the glass bulb affecting proper functioning of the electrode. These bubbles can be removed by “shaking down” the electrode as you would do with a glass thermometer. If the bulb and/or junction is dry, soak the electrode in HI70300 or HI80300 Storage Solution for at least one hour. 16 For refillable electrodes: If the filling solution (electrolyte) is more than 2½ cm (1”) below the fill hole, add HI7082 or HI8082 3.5M KCl Electrolyte Solution for double junction or HI7071 or HI8071 3.5M KCl+AgCl Electrolyte Solution for single junction electrodes. Unscrew the fill hole screw during measurements. For AmpHel® electrodes: If the electrode does not respond to pH changes, the battery is dead and the electrode should be replaced. MEASUREMENT Rinse the electrode tip with distilled water. Submerse the tip (3 cm /1¼”) into the sample and stir gently for a few seconds. For a faster response and to avoid cross-contamination of the samples, rinse the electrode tip with a few drops of the solution to be tested, before taking measurements. STORAGE PROCEDURE To minimize clogging and assure a quick response time, the glass bulb and the junction should be kept moist and not allowed to dry out. Replace the solution in the protective cap with a few drops of HI70300 or HI80300 Storage Solution or, in its absence, Fill Solution (HI7071 or HI8071 for single junction and HI7082 or HI8082 for double junction electrodes). Follow the Preparation Procedure on page 16 before taking measurements. Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER. PERIODIC MAINTENANCE Inspect the electrode and the cable. The cable must be intact and well connected. No cracks should be seen on the electrode stem or bulb. Connectors must be perfectly clean and dry. If any scratches or cracks are present, replace the electrode. Rinse off any salt deposits with water. For refillable electrodes: Refill the reference chamber with fresh electrolyte (HI7071 or HI8071 for single junction or HI7082 or HI8082 for double junction electrodes). Allow the electrode to stand upright for 1 hour. Follow the Storage Procedure above. 17 CLEANING PROCEDURE • General Soak in Hanna Instruments HI7061 or HI8061 General Cleaning Solution for approximately ½ hour. • Protein Soak in Hanna Instruments HI7073 or HI8073 Protein Cleaning Solution for 15 minutes. • Inorganic Soak in Hanna Instruments HI7074 Inorganic Cleaning Solution for 15 minutes. • Oil/grease Rinse with Hanna Instruments HI7077 or HI8077 Oil and Fat Cleaning Solution. IMPORTANT: After performing any of the cleaning procedures, rinse the electrode thoroughly with distilled water, refill the reference chamber with fresh electrolyte (not necessary for gel-filled electrodes) and soak the electrode in HI70300 or HI80300 Storage Solution for at least 1 hour before taking measurements. 18 TROUBLESHOOTING GUIDE SYMPTOMS Slow response/ excessive drift. PROBLEM Dirty pH electrode. SOLUTION Clean the electrode and then soak the tip in HI7061 or HI8061 for 30 minutes. Readings fluctuate Clogged/dirty junction. Clean the electrode. Refill up and down Low electrolyte level with fresh solution (for (noise). (refillable electrodes refillable electrodes only). only). Check cable and connector. The meter does Dirty electrode or Follow the cleaning not accept the contaminated buffer. procedure. If still no results, buffer solution for replace the electrode. calibration. Replace Buffer. If the display shows Out of range in the pH a) Verify that the electrode “pH” and “-2.00” scale. is connected. or “16.00” b) Verify that the shipping blinking. cap has been removed. c) Recalibrate the meter. d) Make sure the pH sample is in the specified range. e) Check the electrolyte level and the general state of the electrode. The display Out of range in the mV Verify that the electrode is shows “mV” scale. connected. and “-2000” or “2000” blinking. The meter does Broken temperature Replace the temperature not work with the probe. probe. temperature probe. Wrong temperature probe used. The meter fails to Broken pH electrode. Replace the electrode. calibrate or gives faulty readings. At startup the me- One of the keys is stuck. Check the keyboard or ter displays all LCD contact the vendor. tags permanently. “Err xx” error Internal error. Power off the meter and message displayed. then power it on. If the error persists, contact the vendor. 19 TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS The resistance of glass electrodes partially depends on the temperature. The lower the temperature, the higher the resistance. It takes more time for the reading to stabilize if the resistance is higher. In addition, the response time will suffer to a greater degree at temperatures below 25 °C. Since the resistance of the pH electrode is in the range of 50-200 Mohms, the current across the membrane is in the pico Ampere range. Large currents can disturb the calibration of the electrode for many hours. For these reasons high humidity environments, short circuits and static discharges are detrimental to a stable pH reading. The pH electrode’s life also depends on the temperature. If constantly used at high temperatures, the electrode life is drastically reduced. Typical Electrode Life Ambient Temperature 1- 3 years 90 °C Less than 4 months 120 °C Less than 1 month Alkaline Error High concentrations of sodium ions interfere with readings in alkaline solutions. The pH at which the interference starts to be significant depends upon the composition of the glass. This interference is called alkaline error and causes the pH to be underestimated. Hanna Instruments’ glass formulations have the indicated characteristics. Sodium Ion Correction for Glass at 20-25 °C Concentration pH 13.00 13.50 0.1 Mol L-1 Na+ 14.00 12.50 13.00 1.0 Mol L-1 Na+ 13.50 14.00 20 Error 0.10 0.14 0.20 0.10 0.18 0.29 0.40 ACCESSORIES pH BUFFER SOLUTIONS HI70004P pH4.01 Buffer Sachets, 20 mL, 25 pcs. HI70007P pH7.01 Buffer Sachets, 20 mL, 25 pcs. HI70010P pH10.01 Buffer Sachets, 20 mL, 25 pcs. HI7004L pH4.01 Buffer Solution, 500 mL bottle HI7006L pH6.86 Buffer Solution, 500 mL bottle HI7007L pH7.01 Buffer Solution, 500 mL bottle HI7009L pH9.18 Buffer Solution, 500 mL bottle HI7010L pH10.01 Buffer Solution, 500 mL bottle HI8004L pH4.01 Buffer Sol. in FDA approved bottle, 500 mL HI8006L pH6.86 Buffer Sol. in FDA approved bottle, 500 mL HI8007L pH7.01 Buffer Sol. in FDA approved bottle, 500 mL HI8009L pH9.18 Buffer Sol. in FDA approved bottle, 500 mL HI8010L pH10.01 Buffer Sol. in FDA approved bottle, 500 mL ELECTRODE STORAGE SOLUTIONS HI70300L Storage Solution, 500 mL bottle HI80300L Storage Solution in FDA approved bottle, 500 mL ELECTRODE CLEANING SOLUTIONS HI70000P Electrode Rinse Sachets, 20 mL, 25 pcs. HI7061L General Cleaning Solution, 500 mL bottle HI7073L Protein Cleaning Solution, 500 mL bottle HI7074L Inorganic Cleaning Solution, 500 mL bottle HI7077L Oil & Fat Cleaning Solution, 500 mL bottle HI8061L General Cleaning Sol. in FDA approved bottle, 500 mL Protein Cleaning Solution in FDA approved bottle, HI8073L 500 mL HI8077L Oil&Fat Cleaning Sol. in FDA approved bottle, 500 mL ELECTRODE REFILL ELECTROLYTE SOLUTIONS 3.5M KCl+AgCl Electrolyte, 4x30 mL, HI7071 for single junction electrodes HI7072 1M KNO3 Electrolyte, 4x30 mL 3.5M KCl Electrolyte, 4x30 mL, HI7082 for double junction electrodes 3.5M KCl+AgCl Electrolyte in FDA approved bottle, HI8071 4x30 mL, for single junction electrodes HI8072 1M KNO3 Electrolyte in FDA approved bottle, 4x30 mL 21 ORP PRETREATMENT SOLUTIONS HI7091L Reducing Pretreatment Solution, 500 mL bottle HI7092L Oxidizing Pretreatment Solution, 500 mL bottle pH ELECTRODES All electrodes part numbers ending with B are supplied with BNC connector and 1 m (3.3’) cable, as shown below: HI1043B Glass-body, double junction, refillable, combination pH electrode. Use: strong acid/alkali. HI1053B Glass-body, triple ceramic, conic shape, refillable, combination pH electrode. Use: emulsions. HI1083B Glass-body, micro, Viscolene, non-refillable, combination pH electrode. Use: biotechnology, micro titration. HI1131B Glass-body, double junction, refillable, combination pH electrode. Use: general purpose. 22 HI1330B Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: laboratory, vials. HI1331B Glass-body, semimicro, single junction, refillable, combination pH electrode. Use: flasks. HI1230B Plastic-body (PES), double junction, gel-filled, combination pH electrode. Use: general, field. HI2031B Glass-body, semimicro, conic, refillable, combination pH electrode. Use: semisolid products. HI1332B Plastic-body (PES), double junction, refillable, combination pH electrode. Use: general purpose. 23 FC100B Plastic-body (PVDF), double junction, refillable, combination pH electrode. Use: general purpose for food industry. FC200B Plastic-body (PVDF), open junction, conic, Viscolene, non-refillable, combination pH electrode. Use: meat & cheese. FC210B Glass-body, double junction, conic, Viscolene, non-refillable, combination pH electrode. Use: milk, yogurt. FC220B Glass-body, triple-ceramic, single junction, refillable, combination pH electrode. Use: food processing. FC911B Plastic-body (PVDF), double junction, refillable with built-in amplifier, combination pH electrode. Use: very high humidity. 24 HI1413B Glass-body, single junction, flat tip, Viscolene, non-refillable, combination pH electrode. Use: surface measurement. ORP ELECTRODES HI3131B Glass-body, refillable, combination platinum ORP electrode. Use: titration. HI3230B Plastic-body (PES), gel-filled, combination platinum ORP electrode. Use: general purpose. HI4430B Plastic-body (PES), gel-filled, combination gold ORP electrode. Use: general purpose. Consult the Hanna Instruments General Catalog for more electrodes with screw-type or BNC connectors. 25 EXTENSION CABLE FOR SCREW-TYPE ELECTRODES (SCREW TO BNC ADAPTER) HI7855/1 Extension cable 1 m (3.3’) long HI7855/3 Extension cable 3 m (9.9’) long OTHER ACCESSORIES Voltage adapter from 115 VAC to 12 VDC HI710005 (USA plug) Voltage adapter from 230 VAC to 12 VDC HI710006 (European plug) Voltage adapter from 240 VAC to 12 VDC HI710012 (UK plug) Voltage adapter from 230 VAC to 12 VDC HI710014 (Australian plug) HI76404N Electrode holder HI8427 HI931001 HI7662 pH and ORP electrode simulator with 1 m (3.3’) coaxial cable ending in female BNC connectors pH and ORP electrode simulator with LCD and 1 m (3.3’) coaxial cable ending in female BNC connectors Temperature probe with 1 m (3.3’) cable 26 WARRANTY HI2210 and HI2211 are guaranteed for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. Electrodes and probes are guaranteed for six months. This warranty is limited to repair or replacement free of charge. Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not covered. If service is required, please contact your local Hanna Instruments Office. If under warranty, report the model number, date of purchase, serial number and the nature of the problem. If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization number from the Technical Service department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packed for complete protection. RECOMMENDATIONS FOR USERS Before using this product, make sure it is entirely suitable for your specific application and for the environment in which it is used. Any variation introduced by the user to the supplied equipment may degrade the meters' performance. For yours and the meter's safety do not use or store the meter in hazardous environments. Hanna Instruments reserves the right to modify the design, construction or appearance of its products without advance notice. 27 World Headquarters Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA www.hannainst.com Local Office Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA Phone: 800.426.6287 Fax: 401.765.7575 e-mail: [email protected] MAN2211 07/18 Printed in ROMANIA 28 ">

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