92691017 Sherwood M926S Operator Manual
Contents
1. It is designed for fast and accurate determinations of Chloride levels in clinical samples Sample volume is 100ul or 20ul and results are displayed on a digital readout in mmol l millimoles per litre Chloride This manual presents complete instructions for setting up and using the M926S A short time spent familiarising yourself with these instructions will be more than repaid in satisfactory operation The M926S is intended for use by persons knowledgeable in safe laboratory practices If the M926S is not used in accordance with these instructions for the protection provided by the equipment may be impaired A Service Manual is available as an optional extra for use by appropriately qualified technical personnel Please refer to Section 10 2 Summary of the Test The M926S is used for the determination of chloride ions It is an instrumental analogue of Argentimetry the traditional titrimetric methods using Silver Nitrate reagent Like these classical methods it relies on the chemical formation of the very insoluble salt Silver Chloride The importance of chloride determination has been realised for well over a century with many variations and changes being made to the techniques in order to improve the detectability and selectivity Research into the analysis of chloride was conducted by Gay Lussac 1832 Levol 1853 Mohr 1856 and Volhard 1874 and their findings have proven to be the basis of the methods that are still2. 10 10 1 10 2 Ordering Information Spares and Accessories When ordering spares or accessories for the M926S please give the following information to your Sherwood Scientific representative Serial number Catalogue number of part Cat No Description Quantity required This will ensure that your order is dealt with quickly and efficiently The number shown in the third column Quantity is the quantity of items that are supplied against the stated catalogue number If the quantity is greater than one then only multiples of that quantity can be supplied Spares and Accessories Cat No 001 56 208 001 56 202 001 56 205 473 56 903 473 59 700 925 11 002 925 11 003 926 11 001 925 14 001 926 89 001 001 53 313 Description Chloride Analyser Combined Acid Buffer 1 x 500ml Chloride Analyser Standard 100mmol I Cl 6 x 100ml Silver Electrode Polish 25g Printer Assembly Universal Printer consumables kit 1 x cathode and 2 x detector electrode set of 3 Anodes pack of 3 Beaker plastic graduated at 14ml Sherwood Stirrer 20mm Service manual Universal Mains adapter Quantity 1 bottle 1 pack 1 vial 1 1 pack 1 set 1 pack 1 1 1 1 20 11 Sherwood Scientific Limited Product Warranty Statement Warranty Term 12 Months Sherwood Scientific Ltd Sherwood warrants subject to the conditions itemised within this document through either Sherwood personnel or personnel of its a
3. Electrode Head 1 Cathode 2 Anode 3 Detector electrodes 4 Stirrer If the length of the anode is less than 57mm discard it and fit a replacement Place a little Electrode Polish on a soft cloth and gently rub the exposed parts of the electrodes until they are clean and bright 4 Refit the electrodes ensure that with the cathode and detector electrodes fully inserted the anode is adjusted to the same length 5 Place a beaker of deionised water on the sample lift and immerse the electrodes Carry out three condition cycles Remove the beaker and wipe the electrodes with a clean soft cloth Carefully inspect the electrodes to ensure that they are clean If they are not repeat paragraphs 1 to 7 If they are still not clean fit replacements ensuring that they are fully inserted 9 Check that all the electrodes are straight and parallel adjusting as necessary 18 9 1 9 2 9 3 9 4 9 5 Troubleshooting Display not illuminated Check that the instrument is connected to a working a c supply and that the power switch is in the On position If the fault persists contact your Sherwood Scientific distributor On screen messages These self explanatory alerts may appear at the top of the display screen Change Buffer And Condition Shown at start up and after twenty consecutive Condition Required samples have been titrated Add Sample Press Titrate Shown after the 18 consecutive titrati
4. in common use today 1 3 Introduction continued Reagents The following solutions are recommended for use with the M926S Ordering information is given in Section 10 2 NOTE All reagents contain preservatives where required Standard Solution is 100mmol I Chloride as Sodium Chloride Combined Acid Buffer Solution is a support electrolyte consisting of a mixture of Acetic and Nitric acids which maintains the correct pH for the complete cycle of titrations and a colloid to hold precipitated silver chloride in suspension WARNING Acid Buffer is an irritant avoid contact with skin Wash exposed areas with water Dilution No dilution is required for Sherwood Scientific reagents Storage Solutions should be stored away from direct sunlight in a cool place preferably with an ambient temperature below 25 77 Do not us e solutions after the expiration date shown on the bottle Do not return decanted contents to the original bottle Caps of standard solution bottles must be done up firmly to prevent evaporation Purification No purification or treatment is required when using Sherwood Scientific reagents Instability Never leave bottles of Standard Solution uncapped as prolonged exposure to the atmosphere will affect the solution s concentration 2 Installation 2 1 Electrical Supply The M926S operates at low voltage 12 Volts d c The universal mains adapter supplied with the M926S comes with a range of
5. Model 926S Chloride Analyser Operator s Manual Sherwood Scientific Limited 1 The Paddocks Cherry Hinton Road Cambridge CB1 8DH UK Copyright 2011 Sherwood Scientific Ltd 92691017 Issue 1 29 January 2011 ECN 638 GADOCUMENT CONTROL Manuals Chloride 926S 92691017 Sherwood M926S Operator Manual Issue 1 docx Contents page 1 Introduction 1 1 MOGUCU een 4 1 2 Summary of Test oe ee eee eeeeeeeeee eee ees 4 1 3 Reagents ee ee eeeeceeeeceeeeeeeeeeeee teen eee 5 Dilution Storage Purification Instability 2 Installation 2 1 Electrical supply esses ee eeeeeeeeeeeeeeeeee 6 2 2 Unpacking os eee eee eeeeceeeee eee ee eee eeeee eens 6 2 3 Assembly ee 7 3 Principles of operation 3 1 Description sateen asaina iaria 8 4 Performance characteristics and specifications 4 1 Range mesni eii a E i daaa 9 4 2 ACCUIACY ML eA Ae a 9 4 3 Linearity o Doene ienie aaa 9 4 4 Reproducibility cceeeeeeeeeeeeeeee ees 9 4 5 Stability 7 o o E e a ade 9 4 6 Response time cceeeeeeeeeeeeeeee eens 9 4 7 Measurement capacity eeeece ea 9 4 8 Samples sineret isdan edi ereenn etiain 9 Type Presentation Volume 4 9 Readout intake dt esedtiweeeevecteseiee eds 10 4 10 Warmup sceeceteeeeeee eee ee eee ee eres 10 4 11 Environmental conditions _ sea 10 Operation Transportation Installation category 4 12 Power requirements cceeeeeeee ee 10 AAS lt SIZO sansvanestnsias pers advoninciv
6. e printer as conditioning can be necessary during the measurement run of samples The sample number sequence is thus uninterrupted The number sequence on a printer can be reset to 001 only by switching off the M926S and reconditioning USB B Output The M926S also has USB B port that enables results to be sent to computers that do not have an RS232 serial comms port A USB cable 001 09 006 is provided The squarer end fits into the socket on the rear of the M926S Item 5 Figure 5 2 page 12 On the PC in Device Manager under Ports COM amp LPT the M926S will typically appear as 926 Series Chloride Analyser COM7 A PC utilities communications programme such as HyperTerminal is required to establish a connection with the M926S and receive data from it Making a connection requires knowledge of which COM port 7 in the example above the M926S is on and the settings 9600 8 N 1 14 6 1 Operating Precautions and Hazards Operating Precautions 1 6 2 The electrodes may go black during use this will not affect the performance Only if the M926S will not measure a Standard or sample will it be necessary to clean the electrodes The M926S requires a warm up period of five minutes to meet the stated specification Reproducibly accurate results are dependent on reproducible pipetting from sample to sample and from aqueous standard to sample If the M926S calibration is checked with an aqueous standard and reproducibl
7. ents Sherwood reserves the right to make any changes in the design or construction of future products of this type at any time without incurring any obligation to make any changes whatsoever to this particular product Reagents supplies consumables accessories and user maintenance items are not included in this warranty 21 Product Warranty Statement continued 7 Repairs or replacement of any part failing due to abnormal conditions including the following are excluded from this warranty a Flood lightning earthquake tornado hurricane or any other natural or man made disaster b Fire bombing armed conflict malicious mischief or sprinkler damage c Physical abuse misuse sabotage or electrical surge d Damage incurred in moving the product to another location User agrees to permit Sherwood personnel or personnel of its authorised distributor to make changes in the product which do not affect results obtained but do improve product reliability Representations and warranties purporting to be on behalf of Sherwood made by any person including distributors and representatives of Sherwood which are inconsistent or in conflict with the terms of this warranty including but not limited to the limitations of the liability of Sherwood as set forth above shall not be binding upon Sherwood unless reduced to writing and approved by an officer of Sherwood Scientific Ltd Except for the obligations specifically set fort
8. er ions These silver ions combine with the chloride in the sample to form silver chloride which is held in suspension by the colloid stabiliser During the titration period the digital readout is updated approximately every 0 3 seconds During these periods the number of silver ions introduced into the sample combine with one unit measurement of chloride When all the chloride has been precipitated as silver chloride free silver ions begin to appear and the solution conductivity changes This change is detected by the detector electrodes and the readout is stopped displaying the results directly in millimoles per litre of Chloride Another sample may now be added to the same acid buffer and the cycle repeated The digital display is held until starting another cycle when it is automatically reset to zero NOTES 1 The M926S uses an absolute method of operation and is calibrated at the factory Recalibration should only be necessary after changing internal electronic components 4 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 Performance Characteristics and Specifications Range 10 to 299mmol Chloride Accuracy Results will be within 2mmol l at the 100mmol I level of the values obtained by standard wet chemical methods after allowing for pipetting errors Linearity Results will be within 1mmol l in the range 10 to 299mmol l or 1 concentration value whichever is the greater Reproducibility The values obta
9. esesns issues caseces 10 414 WIG eiers nasain unset ageag cates 10 5 Operating Instructions 5 1 Controls and indicators eeeeeeee es 11 Condition Titrate Select Units 5 2 Rear panel components ssa eee eee 12 Power switch Power RS232 socket USB A socket USB B socket Contents Page 5 3 Operation ee eeeeeeeeeeeee eee eeeeeeeeeeeee es 13 5 4 RS232 output and Printing see 14 5 5 USB B Output eeeeeeeeeeeeeeeeeeeeeeeteeeeeeees 14 6 Operating precautions and hazards 6 1 Operating precautions cceceeeeeee ee ees 15 6 2 Hazards asisiecetecnsseddasdsteticaieidaediens 15 Quality control 7 1 General a tgeieevew uel Laie eae 16 7 2 Quality control checks eeeeeeeeeeeeeees 16 8 Maintenance 8 1 General sini aveerladteicasitveurianeweediavets 17 8 2 Dally gt Scase vist oust care eRe alee enti 17 8 3 Electrode cleaning and replacement _ 18 Troubleshooting 9 1 Display not illuminated shige NO 9 2 On screen messages seotneniacer 19 9 3 Non reproducible results a eee eee eee 19 9 4 Reproducibly high or low results naun 19 9 5 Non reproducible results ks eeeeeeeeseeeees 19 Spares and accessories 10 1 Ordering information eee 20 10 2 Spares and accessories nuas 20 11 Warranty statement oo eee cece eee eeeeeeeeeeeeeeeeeeeneeeenees 21 22 1 1 1 2 Introduction Introduction The M926S is a direct reading digital chloride meter
10. h in this warranty statement in no event shall Sherwood be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory and whether advised of the possibility of such damages Neither Sherwood nor any of its third party suppliers makes any other warranty of any kind whether expressed or implied with respect to Sherwood Products Sherwood Scientific Ltd 1 The Paddocks Cherry Hinton Road Cambridge CB1 8DH England 22
11. ined from 20 consecutive titrations of a nominal 100mol solution will give a coefficient of variance of lt 1 5 Stability The calibration level mean of five titrations of a standard solution will change by less than 2 Least Significant Digits over the life of any silver anode Response Time A stable reading will be displayed within 26 seconds of pressing the titrate button at a concentration level of 100mmoll Measurement Capacity Twenty samples at 100ul or 20uI sample volume per reagent change Samples Type Chloride in solution having low ionic strength neutral pH and free of silver halides silver reactive constituents other than chloride solid matter and high levels of dissolved solids Presentation By pipette directly into the beaker of Sherwood Scientific Combined Acid Buffer Volume 100ul or 20ul user selectable 4 9 4 10 4 12 4 13 4 14 Performance Characteristics and Specifications continued Readout Measurement results are shown in characters 15mm high on a 2 75 60 dpi backlit LCD screen Separate areas of the display are reserved for measurement units and instrument status information Warm Up Five minutes warm up is required to meet the stated specification Environmental Conditions Operation Temperature range 10 to 35T Maximum relative humidity 85 at 35T non condensin g Transportation Temperature range 40T to 45T Maximum relative humidit
12. it locates in the up position Set the sample volume to 100ul or 20ul using the select button Pipette the chosen volume of 100mmol standard solution into the beaker Press the condition button and wait for the condition cycle to complete Pipette the chosen volume of sample into the beaker and press the titrate button When the stirrer stops note the reading on the display Repeat paragraphs 5 and 6 for further samples Figure 5 3 Electrodes and Electrode Head 1 Cathode 2 Anode 3 Detector electrodes 4 Stirrer At the end of the 18 titration the message Condition in 2 will appear on the screen If only two further samples are to be run return to paragraph 5 However if more than two samples are to be run continue with paragraph 10 Condition in 1 will be shown after the 19 titration IMPORTANT When the 20 titration is complete any further sample added will be 10 11 12 13 14 lost Change Buffer And Condition Condition Required will be displayed on the screen and the titrate button will have no effect Go to paragraph 10 below If Change Buffer And Condition Condition Required is displayed continue with paragraph 10 Lower beaker and empty out contents Rinse with deionised water and dry with clean tissue If necessary adjust the vertical position of the anode Item 2 Figure 5 3 so that it is the same length as the other electrodes If mo
13. nto the two rear positions on the underside of the electrode head Item 3 Figure 2 1 Ensure both electrodes are pushed firmly into their sockets behind the protective rubber boots Figure 2 1 Electrode Head 1 Cathode 2 Anode 3 Detector electrodes 4 Stirrer Insert the stirrer through the stirrer hole and push it firmly into its coupling as shown in Figure 2 1 Item 4 Insert the cathode un sleeved short electrode through the left hand hole and push it firmly into its socket as shown in Figure 2 1 Item 1 Fit an anode 70mm long electrode through the remaining hole into its socket Check that the three shorter electrodes are all fully inserted and then adjust the position of the anode so that all four electrodes are the same length Position the M926S so that there is clear access to the on off switch Item1 Figure 5 2 p 12 The universal mains adapter supplied with the M926S comes with a range of plugs to suit most a c supplies around the world Choose and fit the one that suits your local electricity supply Refer to Section 5 of this manual for detailed operating instructions 3 1 Principles of Operation Description An accurately measured volume of sample 100uI or 20ul set by the select button on the front panel is added to an acid buffer The M926S automatically titrates chloride ions by passing a known constant current between two silver electrodes which provides a constant generation of silv
14. on Condition in 2 Add Sample Press Titrate Shown after the 19 consecutive titration Condition in 1 Out of Solution Check Buffer Shown if electrodes are not in liquid Condition Required Reading 299 Check Sample 299mmol l has been exceeded Check sample Condition Required dilution and that pipette is dispensing correctly Condition cycle timed out Conditioning took too long Too much Chloride in Refer to Operator Manual beaker Stirrer not present or not turning Condition or titrate cycle inoperative Check the beaker contains Chloride add 100uI of standard solution if necessary Clean or replace the electrodes refer to Section 8 3 Make sure that the cathode electrode is fully inserted into its socket If the fault persists contact your Sherwood Scientific distributor Reproducibly high or low results Try using a fresh bottle of standard solution and another pipette Check that carry over in the pipetting is avoided by using a rinse out technique for each sample If the fault persists contact your Sherwood Scientific distributor Non reproducible results The M9265 requires a five minute warm up to meet the stated specification Try another pipette Ensure the pipette is reproducible to 0 5 Standard Deviation Clean or replace the electrodes refer to Section 8 3 Use a fresh bottle of Combined Acid Buffer If the fault persists contact your Sherwood Scientific distributor 19
15. ons of Chloride in clinical solutions The latest Sherwood Scientific technology has been incorporated into the M926S to ensure the validity of the final results However the results can be affected by factors other than instrument malfunction such as sample handling and storage Sherwood Scientific recommend therefore that a Quality Control programme is set up to monitor instrument and operator performance Because the needs of each laboratory are different due to size of workload number of hours worked statutory regulations etc no attempt has been made to formulate a rigid programme Instead in Section 7 2 there are a number of suggestions that will be helpful in specifying a procedure to suit your particular requirements The following references are recommended for further information on Quality Control BS600 2000 A guide to the application of statistical methods to quality and standardisation ISBN 058033227 6 Wesitgard J O Clinical Chemistry 54 612 2008 IMPORTANT If you report your results to a Quality Control Scheme ensure that they are informed of the change in method i e Sherwood Scientific 926S Chloride Analyser Quality Control Checks The following notes are designed to assist you in formulating a Quality Control programme 1 Include a Quality Control as specified in your Quality Control Scheme or at least once per sample run once per day or every 40 samples Check abnormally high and low values daily R
16. outinely include aqueous Standards that contain chloride concentrations that are different to the Standard concentration used for calibrating the M926S Ensure day to day variations do not exceed acceptable values Reproducibility should be checked on 20 replicate samples on a routine basis 16 8 1 8 2 Maintenance General The M926S has been designed to reduce the need for regular maintenance to an absolute minimum The maintenance required is detailed in Section 8 2 Daily Refer to Section 10 for ordering information and catalogue numbers of parts used for daily maintenance which are listed under Equipment Required Daily Equipment Required Disinfectant Solution electrode polish 1 x anode 1 x cathode 2 x detector electrodes ue Check that all four electrodes are straight and parallel and the anode is the same level as the other electrodes If necessary refer to Section 8 3 to clean adjust or replace the electrodes Check that the stirrer is present and is fitted firmly into its coupling Wipe down the sample area with disinfectant solution 17 8 3 Maintenance continued Electrode Cleaning and Replacement Equipment Required Electrode polish soft cloth 1 x cathode 1 x anode and 2 x detector electrode ds Remove the four electrodes by withdrawing them downwards from the electrode head NOTE that the anode Item 2 Figure 8 1 is longer than the other three electrodes Figure 8 1 Electrodes and
17. plugs to suit most a c supplies around the world The a c supply can be in the range 100 240V 50 60Hz 2 2 Unpacking Upon receipt the M926S should be removed from its carton and inspected for damage Contact your Sherwood Scientific representative if any items are missing or damaged 1 Lift out the accessory tray 2 Lift the instrument out of the polythene cover on to a bench 3 Check the instrument and all the items in the carton for signs of damage Check items received against the following list and notify your Sherwood Scientific representative if any discrepancies are discovered IMPORTANT Quantities shown in the following list are those supplied with a new instrument DO NOT re order from this list instead refer to Section 10 of this manual Part No Description Quantity 001 53 313 Universal mains adapter 1 001 09 006 USB lead A M B M 1 8m 1 001 56 202 Chloride Standard Solution 100mmol I Cl 1 x100mI 1 bottle 001 56 205 Silver Electrode Polish 1 vial 001 56 208 Combined Acid Buffer Solution 1 x 500m 1 bottle 925 11 002 1 x Cathode 2 x Detector Electrode set of 3 1 set 925 11 003 Anodes pack of 3 1 pack 926 11 001 Beaker plastic graduated at 14ml Sherwood 2 925 14 001 Stirrer 926 00 109 Chloride Meter 926S Clinical 926 09 051 Lead M926 to Printer Computer 1 1 1 926 91 017 Operators Manual M926S 1 2 3 Installation continued Assembly 1 Fit the two shorter sleeved electrodes i
18. re samples are to be titrated return to paragraph 2 near the top of this page When determinations are complete remove the beaker and dry the electrodes and stirrer by blotting with a clean tissue 13 5 4 5 5 Operating Instructions continued RS232 Output and Printing The M926S has an RS232 output that enables results to be sent to external printers such as the Portable Printer 473 56 903 or other devices with serial inputs I A Serial Cable 926 09 051 is provided if you wish to use an external device The small round end of the cable fits into the socket on the rear of the M926S Item 3 Figure 5 2 page 12 and the other end into the serial input socket of the external device a printer or a computer serial interface Adjust the serial comms settings of the external device to 9600 8 N 1 Direct printing from the M926S Clinical Switch on the external device then switch on the M926S After the initialisation sequence the software version e g v0 24 and serial number e g 16555 are shown on the display screen for approximately 5 seconds The printer will print 926 Chloride Meter Serial Number 1 6599 Software Version 0 24 4 Perform measurements as described in Section 5 3 page 13 After each titration the printer will print the screen value as Sample 001 100 mmol 1 Sample 002 102 mmol l Sample 003 101 mmol 1 During and after the conditioning cycle there is no signal to th
19. uthorised distributors to repair or replace free of all charges including labour any part of this product which fails within the warranty time specified above appertaining to this particular product Such failure must have occurred because of a defect in material or workmanship and not have occurred as a result of operation of the product other than in accordance with procedures described in the instructions furnished with this product Conditions and specific exceptions that apply to the above statement are as follows 1 End user warranty time commences on the date of the delivery of product to end user premises Free of all charges statement applies only in areas recognised by Sherwood as being serviced either directly by its own personnel or indirectly through personnel of an authorised distributor Products purchased outside these areas requiring service during the warranty period will incur charges relative to the travel transit costs involved However products purchased in such areas will be serviced during the warranty period free of all charges providing they are returned carriage paid to either Sherwood or by pre arrangement to an authorised Sherwood distributor All maintenance other than operator maintenance as described in the instructions repairs or modifications have been made by Sherwood or Sherwood authorised personnel This product has where applicable been operated using Sherwood specified supplies and reag
20. when Change Buffer And Condition Condition Required is displayed usually after the allowed maximum number of consecutive samples 20 have been titrated In each case this ensures that a condition cycle is carried out first This prevents an erroneous result on the first titration due to chloride being present in the buffer or beaker select The select button on the M926S allows the user to choose the volume of sample to be measured 100ul or 20ul and shown on the display screen The M926S measures in units of mmol l Chloride 11 Operating Instructions continued 5 2 Rear Panel Components Figure 5 2 Rear Panel and Label detail 1 Power switch 2 Power 3 RS232 socket 4 USB A socket 5 USB B socket On Off toggle switch that switches the d c supply from the mains adapter to the instrument 0 for Off 1 for On Input socket for d c lead from mains adapter to the instrument Input connector for Serial Cable 926 09 051 To accept a memory stick for firmware upgrades Connector for USB Cable 001 09 006 as an alternative for connecting to computers that do not have an RS232 serial comms Port 12 5 3 Operating Instructions continued Operation 1 2 oa Fw 5N Connect power switch on and allow 5 minutes for the M926S to warm up Fill a plastic beaker supplied to the mark with combined acid buffer place the beaker on the platform and raise the platform until
21. y 95 at 45 Compliance with the stated specification will be unaffected by a change in ambient temperature up to 4C per hour provided the operating temperature range is not exceeded Installation Category Installation category 1 Power requirements Mains adapter Input 100V 240V 50Hz 60Hz 0 6A Mains adapter Output 12V 1 25A Size Width 200mm 7 Depth 250mm 9 8 Height 315mm 12 4 Weight 1 9kg 4 2lbs 10 5 5 1 Operating Instructions Controls and Indicators res Sherwood Chloride Analyser 926 Figure 5 1 Front Panel 1 Display screen 2 titrate button 3 condition button 4 select button condition Pressing this button initiates a conditioning cycle The purpose of the conditioning cycle is to titrate out any Chloride present in the buffer or beaker so that the subsequent titration is accurate The conditioning cycle must be run each time the M926S is switched on and each time the buffer is changed usually when Change Buffer And Condition Condition Required is displayed titrate Pressing this button initiates a titration cycle During a titration the stirrer operates for approximately 5 seconds before the readout is set to zero The Chloride is then titrated out of the solution while the readout is incremented When all the chloride is titrated the readout is stopped and held The titrate button is inoperative at switch on and
22. y low results are obtained hold up in the pipette should be suspected and a rinse out technique employed Always dispense standard solution into a small beaker or cup Do not take standard solution directly from the bottle with a pipette as the standard could become contaminated Never pour standard solution back into the bottle once it has been dispensed Ensure that only genuine Sherwood Scientific reagents and supplies are used with the M926S Do not use solutions after the expiry date shown on the bottle Samples should have low ionic strength neutral pH and be free of sulphide sulphydryl silver halides silver reactive substances other than chloride solid matter and high levels of dissolved solids Do not leave the electrodes immersed in reagents when the instrument is not in use Use only the beakers supplied with the M926S It is recommended laboratory practice to wear gloves when handling samples Gloves will also afford protection against the Combined Acid Buffer and against accidental static damage to the electrodes Hazards All electrical equipment is potentially hazardous Never remove covers from the M926S without first ensuring that it is isolated from the a c supply Do not move the M926S when there is a beaker containing Combined Acid Buffer in position on the sample platform 15 7 1 7 2 Quality Control General The M926S Chloride Analyser has been designed to provide fast and accurate determinati
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