Oyster pH - Conductivity - TDS - Meters
Contents
1. term storage without wetting Soak electrode tip in wetting cap filled with 1ml 7 00 buffer for 24 to 48 hours Static Charge Wiping electrodes Rinse electrode in 7 0 buffer and blot Do no wipe electrode Same readings Cracked or broken bulb Replace electrode Use bulb guard in different Avoid plunging electrode to bottom of buffers and container and spinning bars A samples wetting cap will protect bulb between measurements Dehydrated membrane Erratic LCD Samples have low ionic strength For each 50 ml of sample add 1 drop display lacks salt e g distilled de 50uL of SAT KCL No alteration in ionized boiled lake water high pH will occur by inert KCL pressure Temperature conversion table C to Conversion lt lt F 0 32 20 68 25 77 30 86 40 104 50 122 60 140 70 158 80 176 90 194 100 212 4 341350 V2 0 10 06 SPECIFICATIONS Range resolution C 0 01pH 0 02pH 10 19 990ppm 10ppm 0 5 Auto Manual Temperature Manual for pH Auto for conductivity TDS 0 100 C Compensation Correction 2 per C Display 3 1 2 Digit LCD 90 to 180 adjustable viewing angle Overrange Indication Automatic 1 on all ranges Dimensions Weight 3 75 x 4 25 x 2 96 x 108 x 45mm 12 oz 340g Accessories supplied 9V battery pH electrode pH buffers bottle case and conductivity cell MAINTENANCE Conductivity Cell Simulator The meter is s2. A 02451 Copyright 2006 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 6 341350 V2 0 10 06
3. User s Guide EXTECH INSTRUMENTS Oyster pH Conductivity TDS Meters Models 341350 and 341350 P INTRODUCTION Congratulations on your purchase of the Extech s Oyster Series meter or meter kit These devices measure pH Conductivity and TDS These meters are intended for routine laboratory and field testing Accurate measurements are provided in a battery operated portable meter with a hinged display that can be adjusted to any viewing angle Model 341350 includes a glass conductivity electrode and model 341350 P includes a Polymer conductivity electrode METER DESCRIPTION LCD display Battery compartment Conductivity cal pot pH temperature adjust pH CAL and SLOPE adjustments Function switch Electrode connectors ON OFF switch 9 Lanyard attachment pins 10 pH electrode 11 Glass Conductivity cell 12 Polymer Conductivity cell 0 SN Ol GO Ne a OPERATING INSTRUCTIONS pH Calibration 1 Calibrate the meter and electrode before each use to ensure accuracy 2 Connect the pH electrode via the BNC connector to the meter 3 Open the meter to the fully extended position Open the battery cover and install a 9V battery Replace the cover and turn the unit ON The LCD indication should appear 4 Slide the SELECT switch to pH 5 Adjust the TEMP C knob to approximate the solution temperature 6 Remove the wetting cap from the tip of the electrode Rinse in de ionized water blot dry and place the ele
4. ctrode in a 7 00 pH buffer solution Allow to stand for approximately one minute or until the display stabilizes 7 Adjust the CALIB knob until the display reads 7 00 8 Remove the electrode from the buffer and rinse it in distilled water and blot dry Place the electrode in a 4 or 10 pH buffer solution and allow to stand for approximately 1 minute or until the display stabilizes 9 Adjust the SLOPE knob until the display reads 4 00 or 10 00 as required 10 Repeat steps 6 through 9 until no further adjustment is necessary Conductivity TDS Calibration The conductivity cell calibration should be performed frequently to ensure accuracy 1 Connect the conductivity cell to the input socket on the side of the meter 2 Prepare a conductivity solution of approximately the same value as the solution to be measured The solution should be prepared at 25 C 3 Set the meter to the uS cm or TDS mode 4 Place the cell in calibration solution and allow the reading to stabilize 5 Adjust the Cell knob until the display reads the value of the calibration solution Example For a 12560uS cm conductivity solution the display will read 1256 The user must multiply the reading x 10 2 341350 V2 0 10 06 pH Measurement Oe ON BO IN Turn the meter ON and set the function slide switch to the pH position Connect the pH electrode to the side BNC connector Calibrate the electrode if required Adjust the TEMP C dial to the tempe
5. ng or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website at www extech com click on Contact Extech and go to Service Department to request an RA number A Return Authorization RA number must be issued before any productis returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages E xtech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied rm Aa Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User Guide Software updates and other up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Road Waltham M
6. rature of the sample in degrees C Place the electrode in the sample solution and read the pH value on the LCD When all measurements have been taken unplug the electrode and rinse in distilled water shake and store in the wetting cap or a pH 4 buffer solution Notes on pH measurements and electrodes 1 Se RON OO OND The 60120B pH electrode is recessed in the polymer body allowing it to rest against the bottom of a beaker without damage the glass bulb The Electrode should stored in its wetting cap until used Use a pH 4 buffer solution or tap water as the storage medium If bubbles are seen in the bulb area hold the electrode by its cap and shake downwards until bubbles are removed To improve speed of response vigorously stir the electrode in the sample buffer or rinse solution After exposure to a sample buffer or rinse solution shake the electrode with a snap motion to remove residual drops of solution Use part of the next sample buffer to be measured as a rinse solution when possible When calibrating use a buffer as close as possible to the expected pH of the sample Keep buffers and samples at the same temperature to avoid temperature effects pH readings stabilize faster in some solutions than others allow time to stabilize Electrodes deteriorate over time If accuracy falls to 10 the electrode should be cleaned or replaced If no improvement is observed replace the electrode Conductivity TDS Measurement
7. s Multiply readings by 10 Pe WEIN en Turn the meter ON and set the function slide switch to the uS cm or TDS position Place the electrode in the sample solution Multiply the reading in the LCD display by 10 When finished unplug the electrode and rinse in distilled water Notes on the Conductivity TDS Cell Al Cell Storage On sheathed cells replace the sheath over the cell when storing For non sheathed versions soak the cell tip in de ionized water for storage Cell Cleaning After each use the cell tip should be rinsed with de ionized water If solids build up inside the cell carefully remove with a cotton swab soaked in solvent taking care not to touch the metal parts of the inner cell 3 341350 V2 0 10 06 pH Troubleshooting Chart Symptom Recommended Solution Long response Clogged Junction Soak in 4 07 M KCL 60 C for 30 time or reading minutes ont Strong Alkaline measurement Soak in 0 1 M HCL overnight Deteriorated Deteriorated Gel layer Deteriorated Gel layer Protein coating on electrode Soak in 1 gm Pepsin dissolved in surface 100ml of 0 1 m HCL for 30 minutes or as needed Oil paint dyes suspended solids Rinse electrode alternately with on sensor materials solvent then buffer 7 00 Organic solvents are coating Organic mole fraction has to be less sensor than 50 to assure reasonable readings Limit time of measurement Keep probe in the 7 0 buffer between readings Dry Bulb Long
8. upplied with a cell simulator which can be used in place of the conductivity cell to provide a means to verify the operation of the meter The simulator will produce a reading of approximately 800 1200uS 1mS The simulator should not be used as a calibration device This device is helpful in determining if the cause of calibration difficulties is related to the meter or more likely an aged or defective conductivity cell Battery Installation Replacement Install a new battery when the LOW BATTERY indication appears on the LCD 1 2 3 4 Open the top cover display to its fully extended position Locate the slot below the arrow on the battery cover Use a flat bladed screwdriver or small coin to pry up and out in the slot until the cover opens Install the new battery and replace the cover Calibration Repair Services Extech offers complete repair and calibration services for all of the products we sell For periodic calibration or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to insure calibration integrity 5 341350 V2 0 10 06 WARRANTY EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies on sensors and cables If it should become necessary to return the instrument for service duri
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