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Sherwood Scientific 926 Operator's Manual

Chloride analyser
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Model 926
Chloride Analyser
Operator's
Manual
Sherwood Scientific Limited
1 The Paddocks
Cherry Hinton Road
Cambridge
CB1 8DH
UK
Copyright© 2012
Sherwood Scientific Ltd.
th
926 91 000
Issue 2
8
August 2012
ECN 758
G:\DOCUMENT CONTROL\Manuals\Chloride\926\92691000 Sherwood M926 Operator Manual Issue 2.docx

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Summary of Contents for Sherwood Scientific 926

  • Page 1 Model 926 Chloride Analyser Operator’s Manual Sherwood Scientific Limited 1 The Paddocks Cherry Hinton Road Cambridge CB1 8DH Copyright© 2012 Sherwood Scientific Ltd. 926 91 000 Issue 2 August 2012 ECN 758 G:\DOCUMENT CONTROL\Manuals\Chloride\926\92691000 Sherwood M926 Operator Manual Issue 2.docx...

  • Page 2: Table Of Contents

    Model 926 Chloride Analyser Contents page Introduction Introduction ………………………………. Summary of Test …………………….. Reagents ………………………………. Dilution Storage Purification Instability Installation Services Required …………………….. Unpacking ………………………………. Assembly ………………………………. Principles of operation Description ………………………………. Performance characteristics and specifications Range ……………………………………….. Accuracy ………………………………...
  • Page 3 Model 926 Chloride Analyser Contents Page Operation ………………………………. RS232 Output and Printing …………... USB B Output …..…......…. Active Salt Software Package …………… Operating precautions and hazards Operating precautions ………………………. Hazards ………………………………… Quality control General ………………………………… Quality control checks ……………………….

  • Page 4: Introduction

    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 per litre Chloride) or mg% (milligrams percent) salt as Sodium Chloride.

  • Page 5: Reagents

    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.

  • Page 6: Installation

    The a.c. supply can be in the range 100 – 240V, 50 – 60Hz. Unpacking 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. Lift out the accessory tray.

  • Page 7: Assembly

    Model 926 Chloride Analyser Installation continued Assembly 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.

  • Page 8: Principles Of Operation

    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.

  • Page 9: Performance Characteristics And Specifications

    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 926 91 000...

  • Page 10: Readout

    Model 926 Chloride Analyser 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.

  • Page 11: Operating Instructions

    Model 926 Chloride Analyser Operating Instructions Controls and Indicators Press Titrate mmol/l (20µl) condition select titrate Figure 5.1 Front Panel titrate' condition select' 1. Display screen, 2. ' button, 3. ' ' button, 4. ' 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.

  • Page 12: Rear Panel Components

    Power Input socket for d.c. lead from mains adapter to the instrument. RS232 socket Input connector for Serial Cable (926 09 051). USB A socket To accept a memory stick for future firmware upgrades. USB B socket Connector for USB Cable (001 09 006) as an alternative for connecting to computers that do not have an RS232 serial comms.

  • Page 13: Operation

    Model 926 Chloride Analyser Operating Instructions continued Operation Connect power, switch on and allow 5 minutes for the M926 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 it locates in the up position.

  • Page 14: Rs232 Output And Printing

    Portable Printer (473 56 903), or other devices with serial inputs. 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...

  • Page 15: Usb B Output

    Device Manager on the computer. Connect the 926 to the computer with the USB Cable and switch it on. 926 Chloride Analyser will appear under ‘other devices’. Highlight this and right click.

  • Page 16: Operating Precautions And Hazards

    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.

  • Page 17: Quality Control

    The M926 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 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.

  • Page 18: Maintenance

    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.

  • Page 19: Electrode Cleaning And Replacement

    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. 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.

  • Page 20: Troubleshooting

    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 contact your Sherwood Scientific distributor.

  • Page 21: Spares And Accessories

    Model 926 Chloride Analyser Spares and Accessories 10.1 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.

  • Page 22: 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.
  • Page 23 Model 926 Chloride Analyser Product Warranty Statement (continued) Repairs or replacement of any part failing due to abnormal conditions including the following, are excluded from this warranty: Flood, lightning, earthquake, tornado, hurricane, or any other natural or man-made disaster. Fire, bombing, armed conflict, malicious mischief or sprinkler damage.

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