Instruction Manual HI 9812-5 Portable pH/EC/TDS/°C Meter w w w. h a n n a i n s t .
Dear Customer, Thank you for choosing a Hanna product. Please read this instruction manual carefully before using the meter. This manual will provide you with the necessary information for correct use of the instrument, as well as a precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com.
PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipment. If noticeable damage is found, notify your Dealer. Each meter is supplied with: • Combination probe with 8-pin DIN connector & 1 m (3.3') cable HI 1285-5, pH/EC/TDS/°C probe • HI 70007, pH 7.
FUNCTIONAL DESCRIPTION 1) 2) 3) 4) 5) 6) 7) 8) 9) 8-pin DIN connector for probe Liquid Crystal Display pH range selection key µS/cm (EC) range selection key ppm (TDS) selection key pH offset calibration knob EC/TDS calibration knob °C (Temperature) selection key On/Off key 4
SPECIFICATIONS Range 0.0 to 14.0 pH 0 to 1990 µS/cm 0 to 1990 ppm 0 to 60 °C Resolut ion 0.1 pH 10 µS/cm 10 ppm 1°C Accuracy (@ 20 °C/68 °F) ±0.1 pH ±2% f.s. µS/cm ±2% f.s. ppm ±1 °C Typical EMC Deviat ion ±0.1 pH ±2% f.s. µS/cm ±2% f.s. ppm ±1 °C Conversion Fact or 0.
OPERATIONAL GUIDE INITIAL PREPARATION Each meter is supplied complete with a 9V battery. Remove the battery compartment cover on the back of the meter and install the battery while observing its polarity. Connect the probe to the DIN socket on the top of the meter by aligning the pins with the socket and pushing in the plug. Always remove the electrode protective cap before taking any measurements and make sure the meter has been calibrated before taking any measurements.
• Select the appropriate measurement range (EC or TDS). • Wait a couple of minutes for the temperature sensor to reach thermal equilibrium. The display will then show the measurement automatically temperature compensated for temperature with the appropriate indication among the following: “µS” symbol indicates the meter is in EC mode; “ppm” symbol indicates the meter is in TDS mode. TAKING TEMPERATURE MEASUREMENTS • Submerge the tip (4cm/1½") of the probe into the sample to be tested.
p H CALIBRATION For greatest accuracy, frequent calibration of the instrument is recommended. The instrument should be recalibrated for pH: a) Whenever the electrode is replaced. b) At least once a month. c) After testing aggressive chemicals. d) Where extreme accuracy is required. PREPARATION Pour small quantities of pH 7.01 (HI 7007) or pH 4.01 (HI 7004) or pH 10.01 (HI 7010) solution into a clean beaker. To obtain accurate readings, use pH 7.
pH VALUES AT VARIOUS TEMPERATURES For temperature compensation during calibration, please refer to the following chart. TEMP pH VALUES ºC ºF 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 50 4.00 6.92 7.07 9.33 10.18 15 59 4.00 6.90 7.05 9.27 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.
EC/TDS CALIBRATION Accessories needed: • Use HI 70031 (1413 µS/cm) EC calibration solution or HI 70032 (1382 ppm) TDS calibration solution. Note: The conversion between EC and TDS is made by a built-in circuit, hence it is requested to calibrate the meter only in EC or TDS range. The other range is thus automatically calibrated. PROCEDURE • Pour approximately 4 cm (1½") of a conductivity calibration solution (e.g. HI 70031) into a beaker. If possible, use plastic beaker to minimize any EMC interference.
EC/TDS CONVERSION FACTOR The TDS value in aqueous solutions is directly proportional to the conductivity. The ratio between the two parameters depends on the solution. The instrumen has a fixed conversion factor set to 0.5. This means that 1 µS/cm is equal to 0.5 ppm of TDS.
BATTERY REPLACEMENT These meters are powered by a 9V battery that is located on the rear of the instrument. When battery symbol is empty a low battery condition is indicated. When the low battery indication appears, only a few hours of working time remains. It is recommended to replace the battery immediately. When the battery level is so low that it may cause unreliable measurements, the meter turns off. Battery replacement must only take place in a nonhazardous area using a 9V alkaline battery.
PROBE MAINTENANCE PERIODIC MAINTENANCE Inspect the probe and the cable. The cable used for the connection to the meter must be intact and there must be no points of broken insulation on the cable or cracks on the probe stem or bulb. Connector must be perfectly clean and dry. If any scratches or cracks are present, replace the electrode. Rinse off any salt deposits with water.
ACCESSORIES PROBES HI 1285-5 Combination, amplified pH/EC/TDS/temperature probe with built-in temperature sensor, 8-pin DIN connector and 1 m (3.3') cable pH BUFFER SOLUTIONS HI 7004L pH 4.01 buffer solution, 500 mL bottle HI 7006L pH 6.86 buffer solution, 500 mL bottle HI 7007L pH 7.01 buffer solution, 500 mL bottle HI 7009L pH 9.18 buffer solution, 500 mL bottle HI 7010L pH 10.
RECOMMENDATIONS FOR USERS Before using these products, make sure they are entirely suitable for the environment in which they are used. Operation of these instruments in residential areas could cause unacceptable interferences to radio and TV equipment, requiring the operator to follow all necessary steps to correct interferences. The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching this glass bulb at all times.
Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA Technical Support for Customers Tel. (800) 426 6287 Fax (401) 765 7575 E-mail tech@hannainst.com www.hannainst.
