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Sherwood Scientific M410 Service Manual

Flame photometer and dilutor
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Sherwood Scientific Ltd.
1 The Paddocks
Cherry Hinton Road
Cambridge
CB1 8DH
England
Tel. +44 (0)1223 243444
Fax. +44 (0)1223 243300
Copyright © March 2012
410 89 001
Issue 7
G:\DOCUMENT CONTROL\Manuals\Flame\410\41089001 M410 & M805 Service Manual - Issue 7.doc
Sherwood Scientific Ltd
M410 Flame Photometer
M805 Dilutor
Service Manual
Sherwood Scientific Ltd
th
24
March 2012
and
e-mail: info@sherwood-scientific.com
http://www.sherwood-scientific.com
ECN 736

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  • Page 1 CB1 8DH England Tel. +44 (0)1223 243444 e-mail: info@sherwood-scientific.com Fax. +44 (0)1223 243300 http://www.sherwood-scientific.com Copyright © March 2012 Sherwood Scientific Ltd 410 89 001 Issue 7 March 2012 ECN 736 G:\DOCUMENT CONTROL\Manuals\Flame\410\41089001 M410 & M805 Service Manual - Issue 7.doc...

  • Page 2: Table Of Contents

    Sherwood Scientific Limited Contents Introduction Introduction ..............3 CE Mark ..............3 Controls and Services Front Panel Controls and Indicators ......4 Rear Panel Controls and Indicators ......6 Internal Controls ............. 7 Instrument Description General ..............8 Main Printed Circuit Board ........

  • Page 3: Introduction

    CE mark A number of changes have been made to the M410 and M805 to enable them to comply with the electrical and safety requirements for the CE mark to be applied. In summary the major changes are:- M410 Compressor socket on back panel removed.

  • Page 4: Controls And Services

    7200 The rocker switch that switches the AC power supply on (0) and off (0). When the M410 is switched on, the ‘power on’ LED is illuminated, the air compressor (connected to the rear panel) is switched on and an ignition cycle is initiated.
  • Page 5 Sherwood Scientific Limited Controls and Services Front Panel Controls and Indicators Continued M805 Dilutor Diluent Tube Tension Arm The diluent tube tension arm pulls the diluent tube around the pump rotor. Diluent is pumped by the peristaltic action of the rollers passing in succession over the pump tube.
  • Page 6 2 inch's water gauge, using the optional natural gas regulator is also suitable. NOTE Natural gas may give reproducibility results outside specification. NOTE The M410 needs a primary regulator fitted to the gas cylinder, which differs depending on the gas and cylinder configuration:-...

  • Page 7: Rear Panel Controls And Connectors

    805 to 1006 only Two position switch to select 50Hz or 60Hz. Refer to figure 4 for detailed information. Internal Controls There are no internal controls for the M410. However, the Lineariser module contains three preset potentiometers:- Upto serial number 18543 - Adjusts the overall sensitivity of the logarithmic amplifier.

  • Page 8: Instrument Description

    Sherwood Scientific Limited Instrument Description General This section describes the electrical and electronic circuits. The following PCB’s are fitted. Title Part Number Fitted to Main PCB 410 13 001 All models serial number 7201 onwards From serial number 18544 extra features available...
  • Page 9 Sherwood Scientific Limited Instrument Description Main Printed Circuit Board Continued 410 23 001 serial number 2496 to 7200 (and 1905, 1926 to 1928, 2175 to 2199) As 41013001 above, except circuit diagram shown as Figure 2a. 410 13 099 upto serial number 2495 Note the circuit diagram is shown as Figure 2.
  • Page 10 2496 to 7200 When the M410 is powered up, the RL2 opens allowing C23 to charge up through R30. While C23 is charging, VT2 and VT3 are switched off, which results in IC11, pin 8, holding RL1 on and thus supplying AC to the ignition unit, which generates the sparks to ignite the flame.
  • Page 11 Sherwood Scientific Limited Instrument Description Main Printed Circuit Board Continued Fuel Solenoid Control Fuel is supplied to the burner during the ignition cycle, and for as long as the ‘flame on’ condition is sensed. serial number 2496 onwards During the ignition cycle IC11, pin 10, is held low by the ignition timing circuit. This turns VT4 on, which in turn enables the fuel solenoid, thus delivering fuel to the burner.

  • Page 12: Lineariser Printed Circuit Board

    NOTE The Lineariser PCB circuit diagram is shown as Figure 3. General The Lineariser PCB is fitted to the main PCB to convert the M410 for clinical applications. The Lineariser is connected via nine sockets, SK8 to SK16, on the Main PCB.

  • Page 13: Digital Interface/Lineariser

    Please refer to Figure 4a in conjunction with this description. The M805 Dilutor is a stand alone dilutor for use with M410’s fitted with the Lineariser for Clinical applications. Each AC line is fed through a fuse to the ‘power’ on/off push-button, via the terminal block and then back to the terminal block for connection to the transformer.

  • Page 14: Output Accessory

    0 to 5V DC analogue output suitable for chart recorders, data loggers and computer A/D interfaces. The output is a nominal 5V DC equivalent to full scale on the M410 (1999 or 199.9). This output may be finely adjusted to directly match the digital display of the instrument by adjusting the pre-set potentiometer behind the blanking plug to the left of the red socket.

  • Page 15: Maintenance

    Maintenance General The M410 and M805 have been designed to allow customers to carry out all routine maintenance procedures, e.g. Daily, Weekly, Monthly and Six Monthly. Refer to the M410 Instruction Manual or the M805 Instruction Manual for detailed information. The various procedures are listed below:-...

  • Page 16: Setting Up And Check Procedures

    Setting Up and Check Procedures General For information on setting/checking the air regulator, Nebuliser and fuel adjuster refer to the M410 Instruction Manual. Refer to the M805 Instruction manual for information on changing pump tubes and rollers, checking pump flow rates and adjusting the frequency.

  • Page 17: Lineariser Setting Up

    Sherwood recommend that Lineariser PCB’s are set up using the instrument that they will be fitted to. However, if a M410 is not available to supply +5V, -5V and 0V then a power supply will be required, with outputs that are within ±5%.

  • Page 18: Digital Interface/Lineariser Setting Up

    ‘Pozidriv’ (cross head) screwdriver, 1PT; Flat blade screwdriver, blade width 4mm. Switch off the M410. Using a ‘Pozidrive’ screwdriver remove the six screws securing the front panel (two at the bottom front edge and four at the top rear edge). Gently hinge the front panel away from the top edge (the fuel control knob will push off).
  • Page 19 Plush the Digital Interface/Lineariser module into the Main PCB through the front panel. Refit the front panel to the instrument. For calibration of the Digital Interface to the host instrument refer to the instruction manual for the interface or M410 Flame Photometer. 410 89 001 Issue 7...

  • Page 20: M805 Pump Platen Adjustments

    Sherwood Scientific Limited Setting Up and Check Procedures M805 Pump Platen Adjustments Equipment Required Shims, laminated, for setting the dilutor pump platen; Micrometer, metric/imperial; Solder, 14 AWG (16swg). Switch off the dilutor, lift the pump platen and release the diluent pump tube.

  • Page 21: M805 Lubrication

    Sherwood Scientific Limited Setting Up and Check Procedures M805 Lubrication Equipment Required Allen Key 2.5mmAF Castor Oil No.1 grade Lubrication is required on an annual basis to minimise wear on the teeth of the central gear of the sample pump (right-hand side).

  • Page 22: 5V Output Accessory Fitting

    The output is a nominal 5V DC equivalent to full scale on the M410 (1999 or 199.9). This output may be finely adjusted to directly match the display by adjusting the pre-set potentiometer behind the blanking plug to the left of the red socket.

  • Page 23: Troubleshooting

    Sherwood Scientific Limited Troubleshooting Troubleshooting Information Circuit diagrams are provided for the M410 Flame Photometer and M805 Dilutor. These are as follows:- Block and Interconnection Diagram upto serial number 7200 Block and Interconnection Diagram serial number 7201 onwards Main PCB...

  • Page 24: Spares

    Sherwood Scientific Limited Spares Ordering Information The following information will be required when ordering spares:- Unit serial number Catalogue number of part Quantity required. 410 89 001 Issue 7 March 2012 ECN 736 Page 24 of 56...

  • Page 25: Ev1 General Arrangement

    Sherwood Scientific Limited Spares Item Catalogue No. Description Quantity 478 29 800 Lineariser Module upto s/n 18543 410 86 001 Digital Interface/Lineariser s/n 18544 onwards 410 10 001 Photocell Assembly 410 04 006 Inner Glass Chimney 420 08 102 Nebuliser...
  • Page 26 Sherwood Scientific Limited Spares General Arrangement - EV1 Upto s/n 20410 410 89 001 Issue 7 March 2012 ECN 736 Page 26 of 56...
  • Page 27 Sherwood Scientific Limited Spares General Arrangement - EV1 From s/n 20411 410 89 001 Issue 7 March 2012 ECN 736 Page 27 of 56...

  • Page 28: Ev2 Front Panel Assembly

    Sherwood Scientific Limited Spares Item Catalogue No. Description Quantity 410 04 016 Calibration knob 001 08 680 Knob retaining clip 410 20 001 Igniter unit assembly 410 13 001 PCB assembly 410 s/n 7201 on 410 23 001 PCB assembly 410...
  • Page 29 Sherwood Scientific Limited Spares Front Panel Assembly - EV2 410 89 001 Issue 7 March 2012 ECN 736 Page 29 of 56...

  • Page 30: Ev3 Chassis Assembly

    Sherwood Scientific Limited Spares Item Catalogue No. Description Quantity 400 20 004 Restrictor (use with bottle gas only) 410 08 005 Ignition electrode 410 15 001 Phototransistor assembly (flame sensor) 1 460 39 009 Burner 410 26 001 Mixing chamber and burner assembly...
  • Page 31 Sherwood Scientific Limited Spares Chassis Assembly - EV3 Upto s/n 20410 410 89 001 Issue 7 March 2012 ECN 736 Page 31 of 56...
  • Page 32 Sherwood Scientific Limited Spares Chassis Assembly - EV3 From s/n 20411 410 89 001 Issue 7 March 2012 ECN 736 Page 32 of 56...

  • Page 33: Ev4 Gas Chassis Assembly

    Sherwood Scientific Limited Spares upto serial number 7200 Item Catalogue No. Description Quantity 410 06 009 Air pressure gauge & regulator assy 410 21 003 Solenoid valve upto s/n 18655 410 08 006 Solenoid valve s/n 18656 onwards 001 08 441...
  • Page 34 Sherwood Scientific Limited Spares Gas Chassis Assembly - EV4 410 89 001 Issue 7 March 2012 ECN 736 Page 34 of 56...
  • Page 35 Sherwood Scientific Limited Spares EV4a serial number 7201 to 23159 Item Catalogue No. Description Quantity 410 06 009 Air pressure gauge &regulator assy upto s/n 23159 410 21 003 Solenoid valve upto s/n 18655 410 08 006 Solenoid valve s/n 18656 onwards...
  • Page 36 Sherwood Scientific Limited Spares Gas Chassis Assembly - EV4a Serial number :- 7201 to 23159 410 89 001 Issue 7 March 2012 ECN 736 Page 36 of 56...
  • Page 37 Sherwood Scientific Limited Spares EV4b serial number 23160 onwards Item Catalogue No. Description Quantity 410 08 003 Air pressure gauge &regulator assy s/n 23160 on 410 08 006 Solenoid valve s/n 18656 on 001 08 441 Needle valve 001 41 387...
  • Page 38 Sherwood Scientific Limited Spares Gas Chassis Assembly - EV4b Serial Number 23160 onwards 410 89 001 Issue 7 March 2012 ECN 736 Page 38 of 56...

  • Page 39: Ev5 Rear Mounted Components

    Sherwood Scientific Limited Spares Item Catalogue No. Description Quantity 410 19 002 Natural gas regulator kit 001 08 435 Propane regulator 001 08 234 Propane regulator - primary 001 08 732 Butane regulator (for Camping Gaz) 001 08 733 Butane regulator (for 7.5Kg cylinders)
  • Page 40 Sherwood Scientific Limited Spares Rear Mounted Components - EV5 410 89 001 Issue 7 March 2012 ECN 736 Page 40 of 56...

  • Page 41: Ev6 M805 Dilutor

    Sherwood Scientific Limited Spares Item Catalogue No. Description Quantity Platen catch securing screw 001 52 079 Motor - DC 2.7W 24V 001 42 391 Fuse, 1A, AS 001 41 264 Switch, voltage selector 449 06 001 Filter assembly, complete 800 02 013...
  • Page 42 Sherwood Scientific Limited Spares M805 Dilutor - EV6 410 89 001 Issue 7 March 2012 ECN 736 Page 42 of 56...

  • Page 43: Ev7 Main Pcb

    Sherwood Scientific Limited Spares 410 89 001 Issue 7 March 2012 ECN 736 Page 43 of 56...
  • Page 44 Sherwood Scientific Limited Spares EV7a 410 89 001 Issue 7 March 2012 ECN 736 Page 44 of 56...
  • Page 45 Sherwood Scientific Limited Spares EV7b Serial number 7201 to 18267 410 89 001 Issue 7 March 2012 ECN 736 Page 45 of 56...

  • Page 46: Ev8 Lineariser Pcb

    Sherwood Scientific Limited Spares Lineariser PCB upto serial number 18543 410 89 001 Issue 7 March 2012 ECN 736 Page 46 of 56...

  • Page 47: Ev9 Digital Interface/Lineariser

    Sherwood Scientific Limited Spares Digital Interface/Lineariser Module serial number 18544 onwards 410 89 001 Issue 7 March 2012 ECN 736 Page 47 of 56...

  • Page 48: Block And Interconnection Diagram

    Sherwood Scientific Limited M410 Block and Interconnection Diagram - Figure 1 upto serial number 7200 410 89 001 Issue 7 March 2012 ECN 736 Page 48 of 56...
  • Page 49 Sherwood Scientific Limited M410 Block and Interconnection Diagram - Figure 1a serial number 7201 onwards 410 89 001 Issue 7 March 2012 ECN 736 Page 49 of 56...
  • Page 50 Sherwood Scientific Limited M410 Main PCB - Figure 2 upto serial number 2495 410 89 001 Issue 7 March 2012 ECN 736 Page 50 of 56...

  • Page 51: Main Pcb

    Sherwood Scientific Limited M410 Main PCB - Figure 2a serial number 2496 to 7200 410 89 001 Issue 7 March 2012 ECN 736 Page 51 of 56...
  • Page 52 Sherwood Scientific Limited M410 Main PCB - Figure 2b serial number 7201 to 18267 410 89 001 Issue 7 March 2012 ECN 736 Page 52 of 56...
  • Page 53 Sherwood Scientific Limited Lineariser PCB - Figure 3 upto serial number 18543 410 89 001 Issue 7 March 2012 ECN 736 Page 53 of 56...
  • Page 54 Sherwood Scientific Limited Digital Interface/Lineariser PCB - Figure 3a serial number 18544 onwards 410 89 001 Issue 7 March 2012 ECN 736 Page 54 of 56...
  • Page 55 Sherwood Scientific Limited M805 Dilutor - Figure 4 upto serial number 2600 410 89 001 Issue 7 March 2012 ECN 736 Page 55 of 56...

  • Page 56: M805 Dilutor

    Sherwood Scientific Limited M805 Dilutor - Figure 4a serial number 2601 to 13207 410 89 001 Issue 7 March 2012 ECN 736 Page 56 of 56...

This manual is also suitable for:

M805

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