Extech OYSTER-10 pH/mV/Temperature Meter
Contents
1. 00 7 50 to 12 45 12 45 12 45 to 14 00 3 Oyster 10 V1 9 11 09 pH Measurement and Temperature Compensation 1 Te 8 Use the pH mV button to select the pH mode The unit of measure appears on the LCD Connect the pH electrode to the meter and place the sensor end in the solution under test For automatic temperature compensation connect the temperature probe to the meter display will read ATC and place the sensor end in the solution about 1 3 of the way below the solution surface The temperature reading of the solution appears on the bottom of the LCD When the temperature of a sample differs from a buffer solution temperature allow enough time for the electrode to stabilize to the sample s temperature For manual temperature compensation a temperature sensor is not connected to the meter MANUAL is displayed Adjust the meter s temperature display with the up down buttons so that the displayed temperature matches the temperature of the solution A manual thermometer will be needed to determine the solution temperature first To change the unit of measure for temperature C to F or F to C press and hold the pH mV button while powering the meter The LCD reflects the unit of measure Read the pH measurement on the main display An out of range reading is indicated by dashes When the test is complete unplug the electrode and rinse it in distilled water Place approx 1 ml of pH 4 solution or tap2. replace the electrode Electrode Calibration and Cleaning Refer to the earlier section Calibration and Operation for calibration details Refer to the section below Maintenance and Troubleshooting for details on electrode cleaning Electrode Storage The electrode can be stored in the soaker bottle or wetting cap For the storage bottle slide the cover onto the electrode replace the O ring and insert electrode into the bottle firmly tightening the cap Ensure that the bottle or cap is filled with a pH of 4 buffer solution 6 Oyster 10 V1 9 11 09 Maintenance and Troubleshooting Electrode Cleaning The type of electrode coating that occurs over time will determine the cleaning method Soft coatings can be removed by vigorous stirring or by using a squirt bottle Organic chemical coating hard coatings should be chemically removed Only in extreme cases should the bulb be cleaned mechanically Battery Replacement Install a new battery when the low battery indicator appears on the LCD Remove the battery cover install a new 9V battery and replace the battery cover Troubleshooting the Meter Meters are the least likely cause of pH measurement problems To rule out the meter check the following 1 Check the 9V battery and replace it if necessary 2 When using the AC adaptor for power check that the line cord is firmly connected to the meter 3 Replace the existing electrode connector with optional BNC shorting p
3. 20B Operation The Following information applies to the Epoxy Body Sealed Reference Combination pH Electrode Model 60120B Electrode Considerations 1 A 80 10 NO The 60120B pH electrode is recessed in the polymer body allowing it to rest against the bottom of a beaker without damaging the glass bulb This eliminates the need for electrode holders and allows the probe to be used as a stirring rod This sealed reference design eliminates the need for adding filling solutions minimizing dry out and can be used in up to 100 psig systems without external pressurization The Electrode should remain in its bottle or cap until used If bubbles are seen in the bulb area hold the electrode by its cap and shake downwards until bubbles disappear 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 sample buffer to be tested next as a rinse solution whenever 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 at various rates allow time for readings to stabilize Electrodes deteriorate over time If accuracy falls to 10 slope the electrode should be cleaned If no improvement is observed
4. User Manual EXTECH INSTRUMENTS A FLIR COMPANY Oyster 10 pH mV Temperature Meter Introduction Congratulations on your purchase of Extech s Oyster Series splash proof meter This microprocessor based device with tactile buttons simultaneously displays pH or mV and Temperature C F selectable 25 labeled readings can be conveniently stored for later recall The Oyster 10 is battery operated portable and includes a hinged display that can be adjusted to any viewing angle In addition the neck strap offers hands free operation Advanced features include diagnostic displays MIN MAX readings audible alerts 5 point buffer recognition amp Auto Manual temperature compensation This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Specifications Po Range Resolution Accuracy 32 to 212 F 0 100 C AUTO or MANUAL modes temperature readings LCD viewing angle 90 to 180 Over range Indication Displays Operating Humidity Max 80 up to 87 F 31 C decreasing linearly to 50 at 104 F 40 C Operating Altitude 7000ft 2000meters maximum Dimensions Weight 3 75 x 4 25 x 2 96 x 108 x 45mm 12 oz 340g Meter Description LCD Display Battery compartment 9V battery Function buttons Power Up Down Max Min pH mV Store Recall AC Adapter input 117VAC RTD Temperature probe input 3 5mm phono jack BNC style pH mvV ele
5. ctrode input AO Ov NS Neckstrap loop 2 Ed Oyster 10 V1 9 11 09 pH Overview pH is a unit of measure ranging from O to 14pH indicating the degree of acidity or alkalinity of a solution pH tests are the most commonly performed measurements in water analysis using the hydrogen ion activity of a solution to determine acidity or alkalinity Solutions with a pH less than 7 are considered acidic solutions with a pH higher than 7 are known as bases and solutions with a pH of exactly 7 are considered neutral The pH scale is logarithmic so for example if sample A is 1 pH less than Sample B this means that Sample A is 10 times more acidic then Sample B A difference of 1 pH represents a ten fold difference in acidity ORP REDOX Overview ORP stands for Oxidation Reduction Potential and represents the oxidizing or reducing nature of a solution The overall reactive tendency of a solution can be determined from ORP measurements ORP testing is becoming more common in waste water and water treatment measurement regimens The unit of measurement for ORP is mV Calibration and Operation pH Calibration NOTE ORP does not require calibration Before accurate measurements can be obtained it is necessary to calibrate the meter with the electrode Typically pH 7 is calibrated first and then one or more of the other buffers shown in the left column in the table below The meter automatically recognizes all of the buffe
6. d 1 drop strength lacks salt e g 50uL of SAT KCL No alteration in distilled de ionized boiled pH will occur by inert KCL lake water high pressure 8 Oyster 10 V1 9 11 09 Calibration and Repair Services Extech offers repair and calibration services for the products we sell Extech also provides NIST certification for most products Call the Customer Care Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and accuracy Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for three years from date of shipment a six month limited warranty applies to sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is 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 i
7. lug shorts the ground ring to the center pin of the meter s BNC jack and check the following a Set the measurement mode to pH The LCD reading should be stable b Adjust the calibration control for an LCD reading of 7 00 c Change to the mV measurement mode The LCD should read 0 mV d Note that an out of range reading is indicated by dashes 7 Oyster 10 V1 9 11 09 Troubleshooting an Electrode Problem Long response time or Clogged Junction Soak in 4 07 M Potassium Chloride reading drift KCI 60 C for 30 minutes Replace electrode if necessary measurement pH sensing membrane Protein coating on Soak in 1 gm Pepsin dissolved in electrode surface 100ml of 0 1 m HCL for 30 mins or as needed Oil paint dyes suspended Rinse electrode alternately with solids on sensor materials solvent briefly then a buffer 7 00 Organic solvents are Organic mole fraction has to be less coating sensor than 50 to assure reasonable readings Limit time of measurement Keep probe in the 7 0 buffer between readings wetting with 1ml 7 00 buffer for 24 to 48 hours Rinse electrode in 7 0 buffer and blot Do no wipe electrode Same readings in Cracked or broken bulb Replace electrode Use bulb guard different buffers and Avoid plunging electrode to bottom of samples container and spinning bars A wetting cap will protect bulb between measurements Erratic LCD display Samples have low ionic For each 50 ml of sample ad
8. mplied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech 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 am fN 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 MA 02451 1S09001 Certified Copyright 2009 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 9 Oyster 10 V1 9 11 09
9. re stored in non volatile memory saved when the meter is turned off 4 Oyster 10 V1 9 11 09 MAX MIN Display f 2 5 The meter memorizes the highest MAX and lowest MIN readings when prompted Press and hold the MAX MIN button until both the MAX and MIN icons appear on the LCD The meter will now begin keeping track of the MIN and MAX readings To view MAX MIN values press the MAX MIN button again the meter automatically displays the highest and lowest readings in succession and then returns to the MAX MIN recording mode To exit the MAX MIN mode press and hold the MAX MIN button until the MAX and MIN icons disappear To clear the MAX MIN memory cycle the meter power External Temperature Offset Adjustment The Offset Adjustment is used to fine tune the temperature reading of the external temperature probe This procedure is for the external probe only when ATC is active 1 Place the temperature probe into a known temperature and note any temperature reading error Simultaneously Press and Release the Aand buttons 0 0 will appear on the LCD temperature reading Press the A or V button to set the display equal to the error value determined in step 1 Press the STORE button to save the offset value into memory Test the temperature probe in the know temperature source to verify the correction was proper and the adjustment made in the correct direction 5 Oyster 10 V1 9 11 09 pH Electrode Model 601
10. rs listed in the table below and calibrates itself to the buffer s pH value 1 Connect the pH electrode to the meter s BNC connector input Open the top half of the meter to an appropriate viewing position Power the meter with the POWER CAL button Place the electrode into a buffer solution 4 7 or 10 Press and hold the CAL key until the CAL display icon appears During calibration CAL is shown on the display followed by SA saved SO Oe ON When calibration is complete the meter automatically displays END and returns to normal operation mode Repeat steps 1 5 as necessary Note that it is not necessary to turn the meter off and then back on again to calibration another reference Important calibration note Since pH electrodes can vary in performance this meter includes a special feature that displays an electrode s slope in For example if two electrodes one new and moderately used are calibrated in the same pH 4 solution they ll both display pH 4 on the meter This is because the meter will accept one pH value for a range of measurement values as shown in the table below in this case any reading between 1 68pH and 6 50pH will be accepted as 4pH calibration The meter then displays the slope for the electrode under test If the slope is below 75 or above 125 the electrode must be replaced A slope of 100 is ideal pH reading Range of measurement 1 68 0 00 to 1 68 4 00 1 68 to 6 50 7 00 6 50 to 7 50 10
11. water in the wetting cap before replacing it mV ORP Measurements 1 2 Note that calibration is not required for mV measurements Use the pH mV button to select the mV mode The display will reflect the unit of measure Remove the wetting cap from the ORP electrode and connect the cable via the BNC meter connection Rinse the ORP electrode and place it into a sample solution When the LCD stabilizes it will read the redox potential of the sample in millivolts When sampling is complete unplug and rinse the electrode Place a small portion 1ml of distilled water in the wetting cap Place the cap over the electrode 25 Reading Measurement Storage 1 Press the STORE RECALL button to store the current reading Press each time a reading is to be stored If an attempt is made to store more than 25 readings the stored readings starting with the first reading will be overwritten To recall readings press and hold the STORE RECALL button until the RECALL icon appears on the LCD Use the up down arrow buttons to scroll through the stored readings Note that NULL is displayed if there are no readings in memory To exit this mode press and hold the STORE RECALL button until the RECALL icon disappears To clear the contents of the memory press and hold the up and the down arrow buttons while powering the meter on until the CLr icon appears on the LCD All 25 locations will be erased Note Readings a
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