92691005 Sherwood M926S mk2 operators manual Iss.10
Contents
1. All values appearing on the display will be printed as Sample in sequential order even though they may be standards See Section 5 5 3 926 91 005 Issue 10 19 September 2007 ECN 441 14 Model 926S Chloride Analyser Operating Instructions continued 5 4 Operation WARNING Do not attempt sample determinations unless the calibration procedure detailed in Section 5 3 has been successfully carried out 1 Figure 5 3 Keeping the electrodes immersed ensure that the 20ul LED is illuminated LED off for 100uI pipette the 20ul 100ul if selected of sample into the beaker and depress the titrate pushbutton When the stirrer stops note the reading on the display Repeat paragraphs 1 and 2 for further samples Electrodes and Electrode Head 1 Cathode 2 Anode 3 Sense electrodes 4 Stirrer When the change reagents indicator comes on you will have titrated 20 samples If only two further samples are to be run continue with paragraphs 1 and 2 However if more than two samples are to be run continue with paragraph 6 IMPORTANT If a third sample is added after change reagents is illuminated it will be lost as code E02 will be displayed 5 6 926 91 005 If code E02 is displayed continue with paragraph 6 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 1 figure 5 3 so that it2. Reproducibly high or low results n a 22 9 5 Non reproducible results sn eee eee eee 22 10 Spares and accessories 10 1 Ordering information eee 23 10 2 Spares and accessories on eee eeee aes 23 11 Warranty statement ose ee ec ee cece ee eee ee eee eeeee eee eaeeeeaes 24 926 91 005 Issue 10 19 September 2007 ECN 441 3 1 1 1 2 Model 926S Chloride Analyser Introduction Introduction The M926S is a direct reading digital chloride meter It is designed for fast and accurate determinations of chloride levels in industrial samples Sample volume is selectable at 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 use 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 Summary of the Test The Sherwood Model 926S is used for the determination of chloride ions It is an instrumental analogue of Argentimetry the traditional titrimetric methods using Silver Nitrate reag
3. cree cite aaa aA eae ences Operating Instructions 5 1 Controls and indicators eceeeee ees Condition Titrate Mg salt Power Change reagents Display codes Calibration control 5 2 Rear panel components ss eee eee Power Fuses Power switch RS232 communications switch RS232 socket Issue 10 19 September 2007 ECN 441 Model 926S Chloride Analyser Copyright 2007 Sherwood Scientific Ltd Contents page 4 4 5 NOO WO O O O O O Oo 10 10 10 11 13 Model 926S Chloride Analyser Contents Page 5 3 Calibration tessencucsswesevesevecusvseousecaeves 14 5 4 Op rati n wesessigescessweredaesyewseedcezeaeys 15 5 5 RS232 output Printing and Blue Notes 16 5 6 BlueNotes Package eeeeeeeeeeeeeeeeeeeees 16 6 Operating precautions and hazards 6 1 Operating precautions eceeeeeeee ees 17 6 2 Hazards eddeitavidteetvivesisusisteiteadonive ds 17 7 Quality control 7 1 General aeivisiersdeceeeestenreehacenis 18 7 2 Quality control checks eceeeeeeeeeeeeeees 18 8 Maintenance 8 1 General swheiedeeetoviacai dis aPdoeiacaees 19 8 2 DAI aenieei i a a 19 8 3 Electrode cleaning and replacement __ 20 8 4 Calibration procedure eceeeeeeeeeeeee ees 21 9 Troubleshooting 9 1 Error codes nee eee ecececeeeeeeceeeeeeeeneeeaes 22 9 2 Power LED not illuminated 22 9 3 Condition or titrate cycle not operative 22 9 4
4. hole in the side panel item 1 figure 8 2 If the reading is low adjust the control clockwise if high adjust the control counter clockwise The sensitivity is approximately a change of 8mmol I for one complete rotation NOTE The Sherwood Scientific Model 926S uses an absolute method of operation and is calibrated at the factory Recalibration should only be necessary after changing internal electronic components Figure 8 2 Calibrate Control 1 Count adjust controls 5 926 91 005 100 ul above 20ul below Repeat paragraphs 2 to 4 until the mean result is within the range 99 5 to 100 5 Issue 10 19 September 2007 ECN 441 21 9 1 9 2 9 3 9 4 9 5 Model 926S Chloride Analyser Troubleshooting Error Codes E01 The instrument has counted past 299 Check the pipette is dispensing the correct volume 100ul or 20ul E02 Twenty two samples have been run Change the reagents E03 No sample present EEE In RS232 mode External device not connected or not switched on Power LED not illuminated Check that the instrument is connected to a working a c supply and that the power switch is in the on position Check the plug fuse and replace if necessary Check the instrument fuses and replace if required refer to Section 5 2 If the fault persists contact your Sherwood Scientific distributor Condition or titrate cycle inoperative Check the beaker contains chloride add 0 1ml of standard solution if
5. is the same length as the other electrodes Continue as detailed in Section 5 3 paragraph 3 When determinations are complete remove the beaker and allow the electrodes to dry naturally Issue 10 19 September 2007 ECN 441 245 lt Model 926S Chloride Analyser Operating Instructions Operation continued 5 5 RS232 Output Printing and BlueNotes The M926S has been improved with the addition of an RS232 output which enables results to be sent to external printers such as the Sherwood Portable Printer 473 56 903 the new BlueNotes Package 926 86 309 or other devices with serial inputs 1 The communications switch see figure 5 2 item 4 must be set to one of the following positions 0 No external device in operation or connected 1 RS232 in use and cable connected to external device If you wish to use an external device then insert the small end of the Serial Cable 926 09 051 into the socket on the rear of the M926S figure 5 2 item 5 insert the 9way plug at the other end of the serial cable into the serial input socket of the external device a printer the marked input on the Datagate Intelligent Interface or a computer serial interface Set the baud rate for the external device to 9600 Direct printing from the Model 926S Switch on the external device then switch on the M926S The power up sequence contains the software version which is indicated in the third set of displays as e g 033 which is versio
6. 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 is calibrated on an aqueous standard and reproducibly low results are obtained with samples 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 6 2 Hazards 1 926 91 005 All electrical equipment is
7. 5 2 Rear Panel IEC symbol advising user to refer to accompanying documentation Power Input a c power supply connector Fuses Two 160mA 230V or Two 315mA 115V fuses to protect the M926S Both live and neutral are fused Power switch On Off rocker switch that switches the a c line and neutral supplies to the instrument Part of mains inlet RS232 communications switch Your M926S has an RS232 output fitted and this switch is used to provide the different output handshakes See Section 5 5 1 RS232 socket Input connector for Serial Cable 926 09 051 926 91 005 Issue 10 19 September 2007 ECN 441 13 Model 926S Chloride Analyser Operating Instructions Rear Panel Components continued 5 3 Calibration Calibration has to be carried out separately for both 100ul and 20ul sample sizes The procedure is the same except for the selection of sample size by the range button the use off appropriate sample size and its respective calibration control The instructions below are for 20ul sample and settings 1 Connect the M926S to an a c supply and switch on the rear panel power switch Check that power 20ul and change reagents indicators are illuminated all digits on the readout are displayed in sequence from 000 through to 999 Check that change reagents and 20ul indicators are off when readout returns to 000 The software version of the RS232 fitted to your instrume
8. Model 926S Chloride Analyser Operator s Manual Sherwood Scientific Limited 1 The Paddocks Cherry Hinton Road Cambridge CB1 8DH UK 926 91 005 Issue 10 19 September 2007 ECN 441 GADOCUMENT CONTROL Manuals Chloride 926S 92691005 Sherwood M926S mk2 operators manual Iss 10 doc 5 926 91 005 Introduction 1 1 Taltce e 0 e t 0 een 1 2 Summary of the test ow eee eee 1 3 Reagents ssezasnigsevedsdivtdrdehsteeshvecterss Dilution Storage Purification Instability Installation 2 1 Services required oe e eee eeeecee teeter ees 2 2 Unpacking os ce ee eee eeeeceeeee eee eeeeeeeeee eres 2 3 Assembly ee Principles of operation 3 1 DOSCription csezsdiesdveevdesidigensteececeeiaind Performance characteristics and specifications 4 1 Range lerer netrapi Taane aisit 4 2 ACGUrACY stzesbeesesuerainidigugiiie teteeees 4 3 Linearity eroine ienne einne e edat 4 4 Reproducibility ccceeeeeeeeeeeeeee ees 4 5 Stability o isresoFeisyedvelisleteveisielsiaden 4 6 Response time n a 4 7 Measurement capacity ceeeeeee 4 8 SampleS nee eeceeteeeeeeeeeeeeeeeeeeeeees Type Presentation Volume 4 9 Readout wa sacasacictvavesavasiavecaencasass 4 10 Warmup oi eieeeeeeteceeeee eee eeeeeee eee 4 11 Environmental conditions _ see Operation Transportation Installation category 4 12 Power requirements ccceeeeeeee es Voltage Power ANS SIZE xis E ces each ds ANAS WGK Es
9. and Indicators continued Range This pushbutton selects the volume of sample to be measured either 100ul or 20ul The M926S carries out measurements in units of mmol l Cl Make sure that the LED indicator is illuminated by depressing the button to read 20ul samples Power Green LED indicator that is illuminated when the M926S is connected to an a c supply and the on off power switch on the rear panel in on Change Reagents Yellow LED indicator that is illuminated when twenty samples have been titrated A further two samples can be titrated if required before changing the reagents Display Codes The following display codes will appear on the digital readout in place of the measured value Code Indication CCC A condition cycle is in progress E01 The display has counted past 299 E02 Reagents must be renewed Initiated when a twenty third titration is attempted after a conditioning cycle no titration will take place E03 No sample present EEE In RS232 mode External device not connected or not switched on Calibrate Control The calibration control is accessible via a hole in the righthand side panel The calibrate control determines the speed at which the display is updated and therefore the final result The adjustment procedure is detailed in Section 8 4 926 91 005 Issue 10 19 September 2007 ECN 441 12 Model 926S Chloride Analyser Operating Instructions continued 5 2 Rear Panel Components Figure
10. and the readout is stopped displaying the results directly in millimoles per litre 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 926 91 005 Issue 10 19 September 2007 ECN 441 8 4 Model 926S Chloride Analyser Performance Characteristics and Specifications 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 Range 10 to 299mmol Cl Accuracy Results will be within 2mol l at the 100mmol 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 obtained from twenty consecutive titrations of a nominal 100mmol solution will give a coefficient of variance of 1 5 or less 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 depressing the Titrate button at a concentration level of 100mmoll I Measurement Capacity Twenty samples at 100 ul or 20ul volume per reagent change Samples Type Chloride in solution having low ionic strength neutral pH and free of silver halides silver reactive co
11. articular product 6 Reagents supplies consumables accessories and user maintenance items are not included in this warranty 926 91 005 Issue 10 19 September 2007 ECN 441 24 Model 926S Chloride Analyser 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 forth in this warranty statement in no event shall Sherwood be liable for any direct indirect special incidental or con
12. e 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 2 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 3 All maintenance other than operator maintenance as described in the instructions repairs or modifications have been made by Sherwood or Sherwood authorised personnel 4 This product has where applicable been operated using Sherwood specified supplies and reagents 5 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 p
13. ent Like these classic 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 which are still in common use today 926 91 005 Issue 10 19 September 2007 ECN 441 4 Model 926S Chloride Analyser Introduction continued 1 3 Reagents The following Sherwood Scientific solutions are recommended for use with the M9268 Ordering information is given in Section 10 2 NOTE All reagents contain preservatives where required Standard Solution is 100mmol I Cl as Sodium Chloride Combined Acid Buffer Solution is a support electrolyte consisting of a mixture of Acetic and Nitric acids which maintain the correct pH for the complete cycle of titrations and a colloid to prevent precipitation WARNING Acid Buffer is corrosive 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 use solutions after the expiration date show
14. escription Quantity 001 48 154 Fuse 160mA antisurge for spares use 2 230V units 001 48 153 Fuse 315mA antisurge for spares use 2 115V units 001 42 498 Supply lead a c 1 001 56 202 Chloride Standard Solution 100mmol I Cl 6 x 100ml 1 pack 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 Detecting Electrodes set of 3 1 set 925 11 003 Anodes pack of 3 1 pack 926 11 001 Beaker plastic graduated at 10ml Sherwood 2 925 14 001 Stirrer 1 Chloride Meter 1 926 09 051 Lead M926 to Printer Computer 1 926 91 005 Operators Manual 1 926 91 005 Issue 10 19 September 2007 ECN 441 6 Model 926S Chloride Analyser Installation continued 2 3 Assembly CAUTION Check the voltage shown on the serial label If it is not correct for the local supply contact your Sherwood Scientific distributor 1 Figure 2 1 Fit the two shorter sleeved electrodes into 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 Electrode Head 1 Cathode 2 Anode 3 Sense electrodes 4 Stirrer 2 926 91 005 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 unsleeved short electrode through the lefthand hole and push it firmly into its socket as shown i
15. he quantity is greater than one then only multiples of that quantity can be supplied 10 2 Spares and Accessories Cat No Description Quantity 001 56 208 Chloride Analyser Combined Acid Buffer 1 x 500ml 1 bottle 001 56 202 Chloride Analyser Standard 100mmol I CI 6x 100ml 1 pack 001 56 205 Silver Electrode Polish 25g 1 vial 001 48 052 Fuse 150mA antisurge 1 up to s n 12410 001 48 154 Fuse 160mA antisurge for 230V instruments 1 from s n 12411 001 48 153 Fuse 315mA antisurge for 115V instruments 1 from s n 12411 473 56 903 Printer Assembly Universal 1 473 59 700 Printer consumables kit 1 pack 926 09 051 Lead M926 to Printer Computer 1 925 11 002 1 x cathode and 2 x detecting electrodes set of 3 1 set 925 11 003 Anodes pack of 3 1 pack 926 11 001 Beaker plastic graduated at 10ml Sherwood 1 925 14 001 Stirrer 20mm 1 925 89 001 Service manual 1 926 86 309 BlueNotes Package 1 926 91 005 Issue 10 19 September 2007 ECN 441 23 Model 926S Chloride Analyser 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 authorised 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 failur
16. iod the customer opens a Maintenance Contract with Sherwood Scientific This contract is designed to keep your instrument in first class condition by ensuring that all operating systems are routinely checked and adjusted Further details of the Maintenance Contract Scheme can be obtained from your Sherwood Scientific Representative 8 2 Daily Equipment Required Disinfectant Solution e g glutaraldehyde electrode polish 1 x anode 1 x cathode 2 x detecting electrodes iF 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 2 Wipe down the sample area with disinfectant solution 926 91 005 Issue 10 19 September 2007 ECN 441 19 Model 926S Chloride Analyser Maintenance continued 8 3 Electrode Cleaning and Replacement Equipment Required Electrode polish soft cloth 1 x cathode 1 x anode and 2 x detecting electrode 1 Remove the four electrodes by withdrawing them downwards from the electrode head Note that the anode item 1 figure 8 1 is longer than the other three electrodes Figure 8 1 Electrodes and Electrode Head 1 Cathode 2 Anode 3 Sense electrodes 4 Stirrer 2 If the length of the anode is less than 57mm discard it and fit a replacement 3 Place a little Sherwood Scientific Electrode Polish on a soft cloth and gently rub the exposed parts of the electr
17. n 0 33 The printer will print 926S Analyser V0 33 If the communication switch is set 1 and an external device is not connected or is not switched on then the error message EEE alternates with 000 after the initial sequence is finished Perform the calibration and measurement as described in Sections 5 3 and 5 4 After each titration the printer will print the value displayed as Sample 001 100mmol l Sample 002 102mmoll l During and after the conditioning there is no signal to the printer as conditioning can be necessary during the measurement run of samples the number sequence is thus interrupted The number sequence on a printer can be reset to 001 only by switching off the M926S and reconditioning 5 6 BlueNotes Package BlueNotes is a new system enabling the automatic transfer of data via Bluetooth from the M926 and a balance to a computer program which does all the calculations and prepares the final report When used correctly it will ensure good laboratory practice reduce transcript errors and improve efficiency For further detailed information contact your Sherwood Scientific distributor 926 91 005 Issue 10 19 September 2007 ECN 441 16 Model 926S Chloride Analyser Operating Precautions and Hazards 6 1 Operating Precautions 1 The electrodes will go black during use this will not affect the performance Only if the M926S will not measure a Standard or
18. n figure 2 1 item 2 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 mains supply switch Where necessary fit a suitable plug to the a c supply lead Follow the plug manufacturers instructions Refer to Section 5 of this manual for detailed operating instructions Issue 10 19 September 2007 ECN 441 7 Model 926S Chloride Analyser 3 Principles of Operation 3 1 Description An accurately measured volume of sample 100ul or 20ul set by the range 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 silver ions These silver ions combine with the chloride in the sample and 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 sensing electrodes
19. n on the bottle Do not return decanted contents to the original bottle 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 solutions concentration 926 91 005 Issue 10 19 September 2007 ECN 441 5 2 1 2 2 Model 926S Chloride Analyser Installation Services Required An a c supply at 100V 200V 220V or 240V 10 at 50 to 60Hz is required for the M926S The voltage is preset during manufacture and the value is shown on the serial plate attached to the instrument CAUTION If the voltage setting is not correct for the local supply please contact your Sherwood Scientific distributor 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 2 3 IMPORTANT Lift out the accessory tray Lift the instrument out of the polythene cover on to a bench 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 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 D
20. 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 Recalibrate the M926S refer to Section 8 4 If necessary 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 926 91 005 Issue 10 19 September 2007 ECN 441 22 Model 926S Chloride Analyser 10 Spares and Accessories 10 1 Ordering Information 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 t
21. nstituents other than chloride solid mater and high levels of dissolved solids Presentation By pipette directly into the beaker of reagents Volume 100ul or 20ul 926 91 005 Issue 10 19 September 2007 ECN 441 9 4 9 4 10 4 12 4 13 4 14 Model 926S Chloride Analyser Performance Characteristics and Specifications continued Readout Three digit LED display reading up to 299 For definitions of the display codes refer to Section 5 1 of this manual Warm Up Five minutes warm up is required to meet the stated specification Environmental Conditions Operation Temperature range 10T to 35T Maximum relative humidity 85 at 35T non condensin g Transportation Temperature range 40T to 45C Maximum relative humidity 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 Voltage An a c supply at 100V 115V 200V 220V or 240V 10 50 to 60Hz NOTE If you have a 230V supply use the 240V setting Power Fuse rating 220V 240V 2x 160mA 100V 115V 200V 2x 315mA VA rating 10 Volt Amperes Size Width 200 mm 7 Depth 250mm 9 8 Height 315mm 12 4 Weight 3 8kg 8 4lbs 926 91 005 Issue 10 19 September 2007 ECN 441 10 5 5 1 Model 926S Chloride Analyser Operating Inst
22. nt will be indicated during the power on sequence e g 033 is version 0 33 See Section 5 5 4 NOTE All three electrodes go black in use this is normal and will not affect performance 4 Depress range button to illuminate 20ul indicator 5 Add Combined cid Buffer to the mark in a clean sample beaker 6 When the M926S has been switched on for 5 minutes continue with the calibration 7 Place the sample beaker on the platform and raise the platform until it locates in the raised position 8 Pipette 20ul of 100mmol Standard Solution into the beaker 9 Depress condition pushbutton 10 Immediately CCC will be displayed on the readout indicating that conditioning is in progress 11 When the stirrer stops pipette 20ul of 100mmol Standard in to the beaker 12 Depress titrate pushbutton 13 Check that range indicator is on and the reading is 100 2 If reading is satisfactory continue with Section 5 4 Operation If E01 is displayed reading above 299 check that the pipette is dispensing 20ul If the reading is outside the specification repeat from paragraph 11 If the second reading is not within the stated range but is reproducible to 3 refer to Section 8 4 and recalibrate the instrument If it is not reproducible refer to Section 9 Troubleshooting 14 If you are using a printer or computer with your M926S then the result of the calibration will be printed as e g Sample 001 100mmol l
23. odes until they are clean and bright 4 Refit the electrodes ensure that with the cathode and sense 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 6 Carry out three condition cycles 7 Remove the beaker and wipe the electrodes with a clean soft cloth 8 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 10 Calibrate the instrument as detailed in Section 8 4 926 91 005 Issue 10 19 September 2007 ECN 441 20 Model 926S Chloride Analyser Maintenance continued 8 4 Calibration Procedure Equipment Required 100ul or 20ul pipette 100mmol l Cl Standard Solution Combined Acid Buffer Insulated flat blade screwdriver 8mm Refer to Section 5 3 and carry out paragraphs 1 to 11 Carry out five titration s using 100mmol Cl Standard Solution noting each reading If the five readings are not reproducible to within 2 refer to Section 9 Troubleshooting Calculate the mean of the five readings which should be between 99 5 and 100 5mmol l If it is then no further action is required If not continue with paragraph 4 Using a screwdriver adjust the count adjust control through the
24. 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 Issue 10 19 September 2007 ECN 441 17 7 1 7 2 Model 926S Chloride Analyser Quality Control General The M926S Chloride Analyser has been designed to provide fast and accurate determinations of chloride in industrial 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 a 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 Pearson E S British Standard 600 1935 Wesigard J O Carey R N and Wold S Clinical Chemistry 20 825 1974 Barnett R N American Journal of Clinical Pathology 50 671 1968 Tonk
25. ructions Controls and Indicators change reagants Figure 5 1 Front Panel 1 Power indicator 2 Digital readout 3 Change reagents indicator 4 Titrate pushbutton 5 Condition pushbutton 6 Range pushbutton 7 20ul LED indicator Condition Pushbutton that when depressed initiates the conditioning cycle The conditioning cycle must be run each time the M926S is switched on and each time the reagents are changed The purpose of the conditioning cycle is to Titrate out any chloride present in the reagents or beaker so that the subsequent titration is accurate The condition pushbutton also resets the sample number counter which controls the change reagents LED indicator and the E02 error code Titrate This pushbutton when depressed 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 pushbutton is inoperative following switch on and after an E02 error code is displayed 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 reagents or beaker 926 91 005 Issue 10 19 September 2007 ECN 441 11 Model 926S Chloride Analyser Operating Instructions 5 1 Controls
26. s D B Canadian Journal of Medical Technology 30 38 1968 Natrella M G Experimental Statistics National Bureau of Standards Handbook 91 U S Government Printing Office Washington D C 1963 pp4 1 to 4 7 and Table A 21 p T 36 IMPORTANT f 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 is Include a Quality Control at least once every 40 samples following the recommendations of the QC Manufacture 2 Check abnormally high and low values daily 3 Routinely include aqueous Standards that contain chloride concentrations that are different to the Standard concentration used for calibrating the M926S 4 Ensure day to day variations do not exceed acceptable values 5 Reproducibility should be checked on 20 replicate samples on a routine basis 926 91 005 Issue 10 19 September 2007 ECN 441 18 Model 926S Chloride Analyser Maintenance 8 1 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 It is recommended that at the end of the warranty per
27. sequential 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 926 91 005 Issue 10 19 September 2007 ECN 441 25
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