92691000 Sherwood M926 Operator Manual
Contents
1. the M926 is on and the settings 9600 8 N 1 Active Salt Software Package The Sherwood Scientific Active Salt package has been developed to enhance the Model 926 Chloride Analyser Designed initially for the Cheese industry the package may be applied to any food product requiring salt analysis and documentation as the software may be configured by the operator to suit their particular laboratory requirements Designed to collect data directly from a balance with RS232 output and the Chloride analyser some of the advantages are No transcription errors No timed wasted doing manual calculations No need to be achieve specific sample and diluent weights Automatic data storage and analysis report generation For further detailed information contact your Sherwood Scientific distributor 15 6 1 6 2 Model 926 Chloride Analyser Operating Precautions and Hazards Operating Precautions 1 The electrodes may go black during use this will not affect the performance Only if the M926 will not measure a Standard or sample will it be necessary to clean the electrodes The M926 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 M926 calibration is checked with an aqueous standard and reproducibly low results are obtained hold up in the pipette should be suspected and a r2. 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 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 23
3. latest Sherwood Scientific technology has been incorporated into the M926 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 BS600 2000 A guide to the application of statistical methods to quality and standardization ISBN 058033227 6 Wesigard J O Clinical Chemistry 54 612 200 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 926 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 Routinely include aqueous Standards that contain ch
4. per litre Chloride or mg milligrams percent salt as Sodium Chloride This manual presents complete instructions for setting up and using the M926 A short time spent familiarising yourself with these instructions will be more than repaid in satisfactory operation The M926 is intended for use by persons knowledgeable in safe laboratory practices If the M926 is not used in accordance with these instructions 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 M926 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 still in common use today 1 3 Model 926 Chloride Analyser Introduction continued Reagents The following solutions are recommended for use with
5. suchenchayaboes 12 Model 926 Chloride Analyser Contents Page 5 3 Operation shdesbvestvedvgeexdeesestehiehecterss 13 5 4 RS232 Output and Printing see 14 5 5 USB B Outputs fectsstevisccebvisieeetaetieedee cate 15 5 6 Active Salt Software Package 15 Operating precautions and hazards 6 1 Operating precautions ceceeeeeee ee ees 16 6 2 Hazards ienien re rieien Aa ENEAS Ei En 16 Quality control 7 1 General e aen R RSA ARERR TALNA R SERERA EEI 16 7 2 Quality control checks sssssssesnernereren 16 Maintenance 8 1 General aione an Nen EAA na RA 18 8 2 Daily s vt ie e a a O at Ge Lee 18 8 3 Electrode cleaning and replacement __ 19 Troubleshooting 9 1 Display not illuminated aenean 220 9 2 On screen messages anean 20 9 3 Non reproducible results a cee eee 20 9 4 Reproducibly high or low results __ 20 9 5 Non reproducible resultS ks eeeeeeeeseeeees 20 Spares and accessories 10 1 Ordering information ce eeeeeeeeeeeeee eens 21 10 2 Spares and accessories oo eee eeee 21 Warranty statement eee eee cececeeeeeeeeeee esse eeeeeenenenens 22 23 1 1 1 2 Model 926 Chloride Analyser Introduction Introduction The M926 is a direct reading digital chloride meter It is designed for fast and accurate determinations of Chloride levels in industrial samples Sample volume is 0 5ml and results are displayed on a digital readout in mg l milligrams
6. the M926 Ordering information is given in Section 10 2 NOTE All reagents contain preservatives where required Standard Solution is 200mg l 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 Model 926 Chloride Analyser 2 Installation 2 1 Electrical Supply The M926 operates at low voltage 12 Volts d c The universal mains adapter supplied with the M926 comes with a range of 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 U
7. 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 milligrams per litre of Chloride or milligrams salt as Sodium 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 M926 uses an absolute method of operation and is calibrated at the factory Recalibration should only be necessary after changing internal electronic components 2 The mg salt value is obtained from the mg l Chloride result by a fixed calculation This calculation is only correct for sample diluent ratios equivalent to 1gm sample per 100ml diluent used to dissolve dilute the sample 4 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 Model 926 Chloride Analyser Performance Characteristics and Specifications Range 10 to 999mg l Chloride or 2 to 165mg salt See Note 2 on page 8 for more on mg salt Accuracy Results will be within 2mg at the 100mg l level of the values obtaine
8. Model 926 Chloride Analyser Operator s Manual Sherwood Scientific Limited 1 The Paddocks Cherry Hinton Road Cambridge CB1 8DH UK Copyright 2011 Sherwood Scientific Ltd 926 91 000 Issue 1 29 January 2011 ECN 638 GADOCUMENT CONTROL Manuals Chloride 926 92691000 Sherwood M926 Operator Manual Issue 1 docx 1 Introduction 1 1 Introduction a cesses eee ee eee 1 2 Summary of Test 1 3 Reagents sasse Dilution Storage Purification Instability 2 Installation 2 1 Services Required __ 2 2 Unpacking a sees eeeee eee 2 3 Assembly a see eeeeeeeeee eee 3 Principles of operation 3 1 Description sx eee eeeeee eee 4 Performance characteristics and specifications 4 1 Ranger si fsiscsten ai a aeui 4 2 Accuracy eeren 4 3 Linearity eee 4 4 Reproducibility 00 4 5 Stability surisi kerkesi aasi 4 6 Response time o on 4 7 Measurement capacity 4 8 Samples aseeseen Type Presentation Volume 4 9 Readout aeee 4 10 Wamup eeen 4 11 Environmental conditions Operation Transportation Installation category 4 12 Power requirements _ AAS SIZE Avsieccecentsaicasandsacenacavs 4 14 Weight eec 5 Operating Instructions 5 1 Controls and indicators Condition Titrate Select Units 5 2 Rear panel components Power switch Power RS232 socket USB A socket USB B socket Model 926 Chloride Analyser Contents page ak NOO WO O O O O Oooo EART 11
9. Temperature range 10T to 35T Maximum relative humidity 85 at 35T non condensin g Transportation Temperature range 40T to 45T 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 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 Model 926 Chloride Analyser Operating Instructions Controls and Indicators lt gt Sherwood Chloride Analyser 926 Figure 5 1 Front Panel 1 Display screen 2 titrate button 3 condition button 4 se ect Units 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 M926 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
10. ct your Sherwood Scientific distributor 20 Model 926 Chloride Analyser 10 Spares and Accessories 10 1 10 2 Ordering Information When ordering spares or accessories for the M926 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 Description Quantity 001 56 208 Chloride Analyser Combined Acid Buffer 1 x 500ml 1 bottle 001 56 203 Chloride Analyser Standard 200mqg I Cl 6 x 100ml 1 pack 001 56 205 Silver Electrode Polish 25g 1 vial 473 56 903 Printer Assembly Universal 1 473 59 700 Printer consumables kit 1 pack 925 11 002 1 x cathode and 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 1 925 14 001 Stirrer 20mm 1 926 89 001 Service manual 1 926 86 500 Active Salt Software Package 1 001 53 313 Universal Mains adapter 1 21 Model 926 Chloride Analyser 17 Sherwood Scientific Limited Product Warranty Statement Warranty Term 12 Months Sherwood Scientific Ltd Sherwood warrants subject to t
11. d by standard wet chemical methods after allowing for pipetting errors Linearity Results will be within 3mg l in the range 50 to 299mg I Reproducibility The values obtained from five consecutive titrations of a nominal 200mg I solution will be within 3mg l of the mean value 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 36 seconds of pressing the titrate button at a concentration level of 200mg I Measurement Capacity Seven industrial samples at 0 5ml 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 0 5ml Model 926 Chloride Analyser Performance Characteristics and Specifications 4 9 4 10 4 12 4 13 4 14 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
12. h 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 M926 so that there is clear access to the on off switch Item 1 Figure 5 2 page 12 The universal mains adapter supplied with the M926 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 Model 926 Chloride Analyser Principles of Operation Description An accurately measured volume of sample 0 5ml is added to an acid buffer The M926 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 to form silver chloride which is held in suspension by
13. hat do not have an RS232 serial comms port 12 Model 926 Chloride Analyser Operating Instructions continued Operation 1 Connect power switch on and allow 5 minutes for the M926 to warm up 2 Fill a plastic beaker supplied to the mark with combined acid buffer place the beaker on the platform and raise the platform until it locates in the up position Pipette 0 5ml of 200mg I standard solution into the beaker Press the condition button and wait for the condition cycle to complete Pipette 0 5ml of sample into the beaker and press the titrate button oo p w When the stirrer stops note the reading on the display If the results are required in mg salt depress the select button so that mg salt is shown in the units area at the bottom of the display screen See note 2 page 8 7 Repeat paragraphs 4 and 5 for further samples Figure 5 3 Electrodes and Electrode Head 1 Cathode 2 Anode 3 Detector electrodes 4 Stirrer 8 At the end of the 5 titration the message Condition in 2 will appear on the screen If only two further samples are to be run return to paragraph 4 However if more than two samples are to be run continue with paragraph 9 Condition in 1 will be shown after the 6 titration IMPORTANT When the 7 titration is complete any further sample added will be lost Change Buffer And Condition Condition Required will be displayed on the screen and the titrate button w
14. he 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 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 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
15. ill have no effect Go to paragraph 9 below 9 If Change Buffer And Condition Condition Required is displayed continue with paragraph 9 10 Lower beaker and empty out contents Rinse with deionised water and dry with clean tissue 11 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 12 If more samples are to be titrated return to paragraph 2 near the top of this page 13 When determinations are complete remove the beaker and dry the electrodes and stirrer by blotting with a clean tissue 13 5 4 Model 926 Chloride Analyser Operating Instructions continued RS232 Output and Printing The M926 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 1 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 M926 Figure 5 2 Item 3 and the other end into the serial input socket of the external device a printer or a computer serial interface 2 Adjust the serial comms settings of the external device to 9600 8 N 1 3 Direct printing from the Model 926 Switch on the external device then switch on the M926 After the initialisation sequence the software version e g v0 24 and serial number e g 16555 are shown on the display screen fo
16. inse 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 M926 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 M926 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 1 All electrical equipment is potentially hazardous Never remove covers from the M926 without first ensuring that it is isolated from the a c supply Do not move the M926 when there is a beaker containing Combined Acid Buffer in position on the sample platform 16 7 1 7 2 Model 926 Chloride Analyser Quality Control General The M926 Chloride Analyser has been designed to provide fast and accurate determinations of Chloride in industrial solutions The
17. loride concentrations that are different to the Standard concentration used for calibrating the M926 Ensure day to day variations do not exceed acceptable values Reproducibility should be checked on 5 replicate samples on a routine basis 17 8 1 8 2 Model 926 Chloride Analyser Maintenance General The M926 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 1 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 18 8 3 Model 926 Chloride Analyser Maintenance continued Electrode Cleaning and Replacement Equipment Required Electrode polish soft cloth 1 x cathode 1 x anode and 2 x detector electrode 1 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 Electr
18. npacking Upon receipt the M926 should be removed from its carton and inspected for damage Contact your Sherwood Scientific representative if any items are missing or damaged A 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 56 203 Chloride Standard Solution 200mgCl I 1 x 100ml 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 00 009 Chloride Meter 926 Industrial 926 09 051 Lead M926 to Printer Computer p 1 p 926 91 000 Operators Manual 1 2 3 Model 926 Chloride Analyser Installation continued Assembly 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 bot
19. odes and 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 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 19 9 1 9 2 9 3 9 4 9 5 Model 926 Chloride Analyser 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 seven consecutive Condition Required samples have been titrated Add Sample Press Titrate Sh
20. own after the 5 consecutive titration Condition in 2 Add Sample Press Titrate Shown after the 6 consecutive titration Condition in 1 Out of Solution Check Buffer Shown if electrodes are not in liquid Condition Required Reading 999 Check Sample 999 mg l has been exceeded Check sample Condition Required dilution and that the pipette is dispensing 0 5m 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 0 5ml 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 M926 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 Sherwood Scientific Combined Acid Buffer If the fault persists conta
21. 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 particular product 6 Reagents supplies consumables accessories and user maintenance items are not included in this warranty 22 Model 926 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
22. r approximately 5 seconds The printer will print 926 Chloride Meter Serial Number 16556 Software Version 0 24 4 Perform measurements as described in Section 5 3 After each titration the printer will print the screen value as Sample 001 200 mg 1 Sample 002 202 mg 1 Sample 003 201 mg 1 or if mg salt was the measurement unit on screen at the start of the titration Sample 004 034 Salt Sample 005 033 Salt During and after the conditioning cycle there is no signal to the 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 M926 and reconditioning 14 5 5 5 6 Model 926 Chloride Analyser Operating Instructions continued USB B Output The M926 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 M926 Item 5 Figure 5 2 page 12 On the PC in Device Manager under Ports COM amp LPT the M926 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 M926 and receive data from it Making a connection requires knowledge of which COM port 7 in the example above
23. 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 when Change Buffer And Condition Condition Requirea is displayed usually after the allowed maximum number of consecutive samples 7 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 Units The select button allows the user to choose the units in which the result of a titration is displayed The M926 carries out measurements in units of mg l Chloride and only calculates the final result in mg salt when this is the unit on the display This button only operates after a condition cycle 11 Model 926 Chloride Analyser 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 future firmware upgrades Connector for USB Cable 001 09 006 as an alternative for connecting to computers t
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