Instruction Manual HI 9143, HI 9143M HI 9145 Portable Waterproof Microprocessor Dissolved Oxygen Meters SAM PLE ppm °C ON/O HI 91 Micro 43 Auto processo r Diss Cal o Oxyg lved en M eter FF CAL RAN GE HOL D FAC TOR http://www.hannainst.
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 precise idea of its versatility. The instrument is in compliance with tives EN 50081-1 and 50082-1. direc- TABLE OF CONTENTS Preliminary Examination ............................. 1 General Description ...................................
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. In addition to this manual you should find the following items: • D.O.
salty waters and the altitude compensation readjusts for the altitude variance (HI 9143 only). Four 1.5V AA alkaline batteries provide power and make the instrument completely portable. HI 9143 and HI 9145 are also designed to be used with a battery recharger or a 12VDC power supply. A 12VDC input jack is incorporated into the housing. A microprocessor ensures an accurate and rapid calibration and measurement.
FUNCTIONAL DESCRIPTION 2 10 1 10 2 SAMPLE ppm 3 °C 19 HI 9143 Microprocessor Auto Cal Dissolved Oxygen Meter 4 20 ON/OFF 22 5 LOBAT SAMPLE HOLD ppm % 23 21 9 CAL F1 F2 °C 24 8 CAL 6 RANGE HOLD 7 FACTOR 1) 2) 3) 4) 5) 6) Battery Compartment Probe Connector Liquid Crystal Display ON/OFF Button CAL Button (to enter or exit calibration mode) FACTOR button (to select altitude F1 and salinity F2)* 7) UP and DOWN arrow keys (to select F1 and F2 levels)* 8) HOLD key (to freeze displayed
SPECIFICATIONS HI 9143 AND HI 9145 HI 9143 Range HI 9145 0.00 to 45.00 mg/L O2 0.0 to 300 %O2 0.0 to 50.0 °C Resolution 0.01 mg/L O2 0.1 %O2 0.1 °C Accuracy (@25°C/77°F) ±1.5% Full Scale mg/L O2 ±1.5% Full Scale %O2 ±0.5 °C EMC Typical Deviation ±0.3 mg/L O2 ±3.5 %O2 ±0.
PROBE PREPARATION All probes are shipped dry by Hanna Instruments. To hydrate the probe and prepare it for use, connect it to the meter and proceed as follows. 1 Remove the red and black plastic cap which is for shipping purposes Shipping cap and can be discarded. 2 Wet the sensor by soaking the bottom 2½ cm (1") of the probe black in electrolyte (HI 7041S) for 5 minutes. red 3 Take a membrane (HI 76407A supplied with the meter) and Make sure that the rubber O-ring sits properly inside the membrane cap.
CALIBRATION PROBE POLARIZATION The probe is under polarization with a fixed voltage of approximately 800 mV. Probe polarization is essential for stable measurements with the same recurring degree of accuracy. With the probe properly polarized, oxygen is continually "consumed" by passing through the sensitive diaphragm and dissolving in the electrolyte solution contained inside the probe.
• • • • • For an accurate calibration, it is recommended to wait an additional 5 or 10 minutes to ensure optimum conditioning of the probe. Remove the protective cap. Press CAL. "----" appears on the larger LCD together with "CAL" to indicate that the instrument is in calibration mode. The instrument will automatically standardize itself to the actual saturation value. After approx. 1 minute it will show "100%" on the LCD and a small "SAMPLE" to indicate that the calibration is complete.
MEASUREMENT Make sure the meter has been calibrated and the protective cap has been removed. Immerse the tip of the probe in the sample to be tested and ensure that the temperature sensor is also immersed. To display values in % saturation, press RANGE. RANGE For accurate dissolved oxygen measurements, a water movement of at least 30 cm (12”)/sec is required. This is to ensure that oxygen depleted on the membrane surface is constantly replenished. A moving stream will provide adequate circulation.
If the sample contains significant salinity or if the measurement is taken at a higher altitude than sea level, the readout values must be corrected (by taking into account the lower degree of oxygen solubility in such conditions - see below). With HI 9143, set the altitude and/or the salinity before calibration and taking mg/L measurements. The meter will automatically compensate for these factors. With HI 9145, the readout is at sea level and for liquids without any salt content.
ALTITUDE COMPENSATION HI 9143 Press FACTOR and “F1” will be displayed. Use the UP and the DOWN keys to set the altitude from 0 and 1900 m, in steps of 100 m. (With HI 9143M the altitude can be set from 0.0 to 4.0 Km, in steps of 0.1 Km). FACTOR ppm SAMPLE F1 or HI 9145 With HI 9145, all the D.O. readouts are referenced to sea level. Altitude affects D.O. concentration decreasing its value. The following table reports the maximum oxygen solubility at various temperatures and altitudes.
The table provides an idea of the error that can be introduced at different altitudes and the quantity to be subtracted to correct the reading. SALINITY COMPENSATION HI 9143 Press FACTOR twice and “F2” will be displayed. Press UP and DOWN to set the salinity between 0 and 40 g/L (0 to 80 g/L for HI 9143M). Press FACTOR again to display the temperature. FACTOR ppm SAMPLE F2 or HI 9145 All D.O. readouts are referred to 0 g/L of salinity. Salinity affects D.O. concentration by decreasing its value.
PROBE & MEMBRANE MAINTENANCE The oxygen probe body is made of reinforced polypropylene for maximum durability. A thermistor sensor measures temperature of the sample. It is recommended that the protective cap be always kept on the probe when the probe is not in use. To replace the membrane or refill it with electrolyte, proceed as follows: • Remove the protective cap by gently twisting and pulling it off the probe (see fig. 1). • Unscrew the membrane by turning it counterclockwise (see fig.
• • Make sure that the rubber O-ring is seated properly inside the membrane cap. With the sensor facing down, screw the membrane cap clockwise. Some electrolyte will overflow. The Platinum cathode sensor (#8 in the Functional Description on page 2) should always be bright and untarnished. If it is tarnished or stained, which could be due to contact with certain gases or extended use with a loose or damaged membrane, the cathode sensor should be cleaned. Use a clean, lint-free cardboard or cloth.
BATTERY REPLACEMENT When the batteries are run down "LOBAT" is displayed on the Liquid Crystal Display. This is to inform the user that the display will be shut-off after about 4 hours of use to prevent erroneous measurements due to low voltage. LOBAT SAMPLE ppm °C Battery replacement must only take place in a non-hazardous area using alkaline batteries.
Use only the Hanna voltage adapters (such as HI 710005 or HI 710006 - see below) with proper polarity configuration. HI 9143 and HI 9145 can however also run on other adapters. In this case, check the correct polarity of your adapter before connecting it to the meter. ACCESSORIES HI 740027 1.
WARRANTY All Hanna meters are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to the instructions. The probes are warranted for a period of six months. This warranty is limited to repair or replacement free of charge. Damages due to accidents, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact the dealer from whom you purchased the instrument.
CE DECLARATION OF CONFORMITY DECLARATION OF CONFORMITY We Hanna Instruments Srl V.le delle industrie 12 35010 Ronchi di Villafranca (PD) ITALY herewith certify that the waterproof dissolved oxygen meters HI 9143 HI 9145 have been tested and found to be in compliance with the following regulations: IEC 801-2 IEC 801-3 IEC 801-4 EN 55022 Electrostatic Discharge RF Radiated Fast Transient Radiated, Class B Date of Issue: 11-10-1995 D.Volpato - Engineering Manager On behalf of Hanna Instruments S.r.l.
HANNA LITERATURE Hanna publishes a wide range of catalogs and handbooks for an equally wide range of applications. The reference literature currently covers areas such as: • Water Treatment • Process • Swimming Pools • Agriculture • Food • Laboratory • Thermometry and many others. New reference material is constantly being added to the library. h t t p : / / w w w . h a n n a i n s t .
