HI 9142 - Hanna Instruments
Contents
1. e After a few seconds Cnd Prb message appears to inform the user that the probe is in auto conditioning mode automatic polarization about 1 minute om I T ogn gt With probe in air turn trimmer to read 100 gt Press JE gt will stop blinking meter is calibrated irr AEREI BATT V a l E 2 Prh Note Press any key except On Off to skip conditioning time e When the conditioning message disappears the probe is polarized and the instrument can be calibrated e The meter is now ready to operate If the probe is not connected the d LCD lines The auto off feature turns the instru if no key is pressed isplay shows on both ment off after about 8 min 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 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 revealed are both that of the tested solution as well of the electrolyte solution This2. Weight 300 g 10 6 oz PROBE INITIAL PREPARATION Probe Preparation All D O probes from Hanna Instrument are shipped dry To hydrate the probe and prepare it for use connect it to the meter and proceed as follows 1 Remove the red amp black plastic cap This Shipping cap is used for shipping purposes only and SE can be thrown away i black 2 Wet the sensor by soaking the bottom 2 5 cm 1 of the probe in HI 7041S electrolyte solution for 5 minutes red 3 Rinse the membrane HI 76407A supplied with the meter with some electrolyte AT while shaking it gently Refill with clean electrolyte H OJ 4 Gently tap the sides of the membrane with your finger FILL FIRST XY J to ensure that no air bubbles gees remain trapped inside THEN p i bed pray To avoid damaging the D membrane do not tap the L membrane directly on the THEN SCREW batter BACK ON 5 Place the rubber O Ring properly inside the membrane cap 6 With the sensor facing down screw the cap clockwise Some electrolyte will overflow When not in use and during polarization protect the membrane with the supplied cap Connect the probe to the instrument Tum the instrument ON by pressing On Off At start up the display will show all the used segments for a few seconds followed by the percentage indication of the remaining battery life
3. reading is incorrect CALIBRATION PROCEDURE The calibration is very simple and fast e Make sure the probe is ready for measurements see initial preparation at page 7 i e the membrane is filled with electrolyte and the probe is connected to the meter e Switch the meter on by pressing the On Off key On Off e Foran accurate calibration itisrecommended thatyou waitat least 15 minutestoensure precise conditioning of the probe e Remove the protective cap from the D 0 probe SLOPE CALIBRATION It is suggested to perform the slope calibration in satured air 100 DO e Rinse the probe in a large amount of clean water to remove any residual zero oxygen solution Dry the probe tip and allow a few minutes for the LCD readout to stabilize Pressthe CAL key and follow the indication on the display e Adjust the slope trimmer on the bottom ofthe meterto read 100 onthe LCD Note e The slope calibration screw is located on the bottom of the case e Press the CAL key and the LCD will display the value in mg L of oxygen to read 100 Press GLB will stop blinking meter is calibrated A zero calibration is also possible ZERO CALIBRATION e Dip the probe into HI 7040 zero oxygen solution and stir gently for 2 3 minutes e Press and hold down CAL key then press ZERO key e tag will blink until the reading stabilize e W
4. 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 contact the dealer from whom you purchased the instrument 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 All rights are reserved Reproduction in whole or in part is prohibited without the written consent of the copyright owner 18 Recommendations for Users Before using this product make sure that it is entirely suitable for the environment in which it is used Operation of this instrument in residential area could cause unacceptable interferences fo radio and TV equipment requiring the operator to take all necessary steps to correct interferences Any variation introduced by the user to the supplied equipment may degrade the instrument s EMC performance To avoid electrical shock do not use this instrument when voltages at the measurement surface exceed 24 Vac or 60 Vdc T
5. Instruction Manual HI 9142 Portable Waterproof Dissolved Oxygen Meter AA www hannainst com 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 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 fech hannainst com or view our worldwide contact list at www hannainst com TABLE OF CONTENTS PRELIMINARY EXAMINATION u csssssssssesssesssesscccseeesssessees 3 GENERAL DESCRIPTION cssscossnsessvsesessecsoosoressnnsansaveeessees 3 PROBE FUNCTIONAL DESCRIPTION sssssscscccssssssseeeeesess 4 METER FUNCTIONAL DESCRIPTION u ecssssssssseeessseseeeee 5 SPECIFICATIONS ic csicastssssishcacescovsreces step enarsiediectenceueiae wien 6 PROBE INITIAL PREPARATION sssssssssssssssssececccseeesssessens 7 CALIBRATION PROCEDURE lt cevsssssesosessaseassnecssvasencessenseson 9 TAKING MEASUREMENTS csssstdscossstssninctvatovtassedeanstenninee 11 ALTITUDE AND SALINITY COMPENSATION sessseeesseesseee 12 PROBE AND MEMBRANE MAINTENANCE s scscccsseeesee 14 BATTERY REPLACEMENT 22k 16 ACCESSORIES as EE 17 WARRANTY corsa seen erne 18 PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine
6. hen the reading is stable the message Press CAL meter is calibrated will be displayed e Press CAL to exit zero calibration The zero calibration of the HI 9142 is very stable therefore this procedure needs only to be performed whenever the probe is replaced However because the slope calibration is more critical it is recommended to perform this procedure every week TAKING MEASUREMENTS Make sure the meter has been calibrated and the protective cap has been removed Immerse the tip ofthe probe in the sample to be tested Make sure the temperature sensor is also immersed For accurate dissolved oxygen measurements a water movement of 0 3 m sec is required at a minimum This is to ensure that the oxygen depleted membrane surface is constantly replenished moving stream will provide adequate circulation To quickly check if the water speed is sufficient wait for the no reading to stabilize and then move the D 0 11 7 probe If the reading is still stable the m n me AM measurement conditions are right while if the reading increases the water movement is not adequate During field measurements this condition may be met by manually agitating the probe Accurate readings are not possible while the liquid is at rest During laboratory measurements the use of a magnetic stirrer to ensure a certain velocity in the fluid is recommended In this way errors due to the diffusion of the oxygen p
7. in the measureme of oxygen In HI 9142 all the readouts are referred to 0 g L of salinity va In fact salinity affects D O concentration decreasing its value ility For your reference the table below reports the oxygen solub at various temperatures and salinity From the table you can calculate the quantity to be subtracted to correct your reading Salinity g L at Sea Level Pos Por Poe Par ae a nn COCCOLE ODDE Par Pie Pie ow os Pe Poe fie Dn os oe fo t ue cD PROBE AND MEMBRANE MAINTENANCE The oxygen probe body is made of reinforced plastic for maximum durability A thermistor temperature sensor provides temperature measurement and compensation When not in use it is always recommended to protect the probe against damage and dirt using the supplied cap To replace the membrane or refill with electrolyte proceed as follows e Remove the protective cap by gently gt twisting and pulling it off see fig 1 e Unscrew the membrane by turning TWIST it counterclockwise see fig 2 AND e Wet the sensor by soaking the PULL bottom 2 5 cm of the probe in HI 7041S electrolyte solution for fig 1 5 minutes e Rinse the new membrane HI 76407A supplied with the meter with some electrolyte while shaking it gently Refill with clean electrolyte r e Gently tap the sides ofthe membrane with your finger to ensure that no air bubbles remain trapped inside Do no d
8. irectly tap the bottom as this will damage the membrane e Make sure that the rubber O ring is seated properly insidethe membrane cap e With the sensor facing down screw the membrane cap clockwise Some electrolyte will overflow cs UNSCREW fig 2 The Platinum cathode 8 in the Functional Description at page 4 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 should be cleaned Use a lint free cardboard or cloth and rub the cathode very gently side to side 4 5 times This will be enough to polish and remove any stains without damaging the platinum tip Afterwards rinse the probe with deionized or distilled water and install a new membrane cap using fresh electrolyte Recalibrate the instrument Important In order to have accurate and stable measurements it is important that the surface of the membrane is in perfect condition This semi permeable membrane isolates the sensor elements from the environment but allows oxygen to enter If any dirt is observed on the membrane rinse carefully with distilled or deionized water If any imperfection still exists or any damage is evident such as wrinkles or tears the membrane should be replaced Make sure that the O Ring is properly seated in the membrane cap BATTERY REPLACEMENT When the ba
9. it to make sure that no damage has occurred during shipping If there is any damage notify your Dealer The meter is supplied complete with e HI 76407 4 DO probe with 4 m cable e 72 spare membranes with O rings e HI 7041S electrolyte solution 30 ml Calibration screwdriver Batteries 3 x 1 5V AAA Instruction manual Rugged carrying case Note Save all packing material until you are sure that the instrument functions correctly All defective items must be returned to us in the original packaging with the supplied accessories GENERAL DESCRIPTION HI 9142 is a rugged waterproof meter that solves the common problems of field use such as cold rain snow and dust that can damage a meter rapidly deteriorating its performance and life It is very simple to use calibration is performed with HI 7040 zero oxygen solution while 100 calibration is done in air The polarographic probe HI 76407 4 is provided with a membrane covering the sensors and a built in thermistor for temperature measurement and compensation The thin permeable membrane isolates the sensor elements from the testing solution but allows oxygen to enter When a voltage is applied across the sensor oxygen that has passed through the membrane reacts causing current fo flow allowing the determination of oxygen The probe included with the meter is supplied with a 4 m 13 cable that allows measurements to be taken even in even hard to reach places For applications tha
10. oavoid damages or burns do not perform any measurement in microwave ovens In particular cases the meter could turn off In these cases it can be turned on by pressing the ON OFF key Hanna Instruments reserves the right to modify the design construction of appearance of its products without advance notice ANN instruments 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 com Local Sales and Customer Service Office Printed in EUROPE ROMANIA MAN91422 08 12
11. resent in the air in the solution are reduced to a minimum At all times time necessary for thermal equilibrium to occur between the probe and the sample must be allowed a few minutes for temperature difference of several degrees ALTITUDE AND SALINITY COMPENSATION If the sample contains salts or if you are performing the measurements at a different altitude than sea level the readout values must be corrected taking into account the lower degree of oxygen solubility ALTITUDE COMPENSATION All the readouts are referred at sea level thus the displayed measurements are higher than the actual values In fact altitude affects D O concentration decreasing its value The following table reports the oxygen solubility at various temperatures and altitudes based on sea level barometric pressure of 760 mm Hg i Altitude Meters above Sea Level i eee ae Poe er oe ms fm Poel we ae ae ow IE 4 27 122 ng na no 106 392 6 20 ns n2 f w 1 428 8 14 no 464 10 109 105 50 0 n 53 6 14 99 26 57 2 16 60 8 18 64 4 20 68 0 2 a4 ar nb 4 ai 78 752 26 788 28 82 4 30 86 0 32 89 6 34 93 2 36 968 38 100 4 40 104 4 This gives an idea of the error that can be introduced at different altitudes and allows you to calculate the quantity to be subtracted to correct your reading SALINITY COMPENSATION The table below shows the influence of salt
12. t require longer probe cables the HI 76407 10 and HI 76407 20 probes with a 10 m 33 or 20 m 67 cable are available PROBE FUNCTIONAL DESCRIPTION D O probe Protective cap Shielded cable Polypropylene probe body Temperature sensor O Ring seal Silver chloride AgCl anode Platinum cathode sensor Oxygen permeable membrane Membrane cap O SO O N OW MN Se Ww N METER FUNCTIONAL DESCRIPTION Liquid Crystal Display LCD On Offbutton C F Celsius or Fahrenheit selection button Zero oxygen calibration button Battery compartment cap Probe connector DIN7 Calibration button Secondary LCD line Primary LCD line Slope calibration trimmer 5 O SO ONO MO RAON s l SPECIFICATIONS Range 0 0 to 19 9 mg L ppm 5 0 to 50 0 C 23 0 to 122 0 F Resolution 0 1 mg L 0 1 C 1 F Accuracy 1 5 FS 0 2 C 1 F excluding probe error Calibration Manual in 100 DO Automatic in 0 DO Temperature Compensation Automatic 0 to 50 C 32 to 122 F Probe HI 76407 4 polarographic with 4 m 13 cable included Battery Type Life 3x 1 5V AAA approx 1000 hours of use Auto off After approx 8 minutes Environment 0 to 50 C 32 to 122 F RH max 100 Dimensions 185 x 72 x 36 mm 7 3 x 2 8 x 1 4
13. ttery level is low BATT tag is displayed blinking on the LCD to advise the user that approx 1 hour of working time is left It is recommended to change the batteries as soon as the battery indicator blinks To replace the batteries follow the next steps Turn OFF the instrument Open the battery compartment cap located on the top of the instrument Remove old batteries Insert three new 1 5V AAA batteries in the battery compartment following the instructions on the rear of the instrument Reattach the battery compartment cap Q J SV AAA The instrument is provided with the BEPS Battery Error Prevention System feature which automatically turns the instrument off when the batteries level is too low to ensure reliable readings At start up the display will show O BATT message for a few seconds then the instrument automatically turns off 16 HI 7040L HI 7041S HI 7041M HI 7041L HI 76407 4 HI 76407 10 HI 76407 20 HI 76407A P Zero oxygen solution 500 mL Refilling electrolyte solution 30 mL Refilling electrolyte solution 230 mL Refilling electrolyte solution 500 mL D 0 probe with 4 m 13 cable D O probe with 10 m 33 cable D 0 probe with 20 m 66 cable D 0 membrane 5 pcs WARRANTY HI 9142 is guaranteed for two years against defects in workmanship and materialswhen used fortheirintended purpose and maintained according to instructions
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