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ADC MGA3000 series Operation Manual

Multi-gas analyser
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MGA3000
MULTI-GAS ANALYSER
OPERATION MANUAL

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  • Page 1 MGA3000 MULTI-GAS ANALYSER OPERATION MANUAL...

  • Page 2: Table Of Contents

    2.10.1 Use of Gas Cylinders................... 13 2.10.2 Gas Leaks ....................14 2.10.3 Exhausting & Ventilation ................14 3. Setting Up.....................15 3.1 Preview....................... 15 3.2 On Power Up ....................... 15 3.3 Zero & Span Operations..................15 Copyright  2007, ADC Gas Analysis Ltd.
  • Page 3 9. Moisture Sensor Option...................33 9.1 General Description ....................33 9.1.1 MGA3000 Zero Calibration................33 9.1.2 MGA3000 Span Calibration................33 9.1.3 Sensor Autocal..................... 33 9.1.4 Pre-conditioning the transmitter..............34 9.1.5 Adjust the Auto Cal ..................34 Copyright  2007, ADC Gas Analysis Ltd.
  • Page 4 MGA3000 Multi-Gas Analyser Operation Manual Iss. 1.00 9.1.6 Completing the Auto Cal ................34 9.1.7 Faults/Errors....................35 Copyright  2007, ADC Gas Analysis Ltd.

  • Page 5: Contents

    [refer to Section 2.9]. 1.1 About the Instrument The MGA3000 Series Instrument is designed for bench or rack mounting and provides a measurement of gas concentration according to specific user requirements. Single, dual or triple gas versions are available utilising one or more IRGA optical benches and/or chemical cells.

  • Page 6: The Display & Operating Controls

    1.3 The Display & Operating Controls 1.3.1 The Display The display is a LCD Graphic type that is illuminated from behind to achieve good contrast and visibility. Its primary function is to provide large character readouts of the gas concentrations together with sample flow status and key functions.

  • Page 7: Operating Principles

    1.6 Operating Principles 1.6.1 Infrared Absorption With the exception of Oxygen, the instrument measures gas concentrations using the effect of infrared absorption. All heteroatomic gases absorb (or transmit) light energy in the infrared region at specific wavelengths that are dependent upon the chemical composition of each type of gas. Furthermore, the level of absorption is proportional to the mass of the gas present.

  • Page 8: The Oxygen Sensor In Use

    ADC (Sales & Service) Ltd. or their authorised local agents can supply replacement sensors with the correct fittings and electrical characteristics. Fitting alternative parts may cause problems...

  • Page 9: Installation

    2. I NSTALLATION 2.1 Installation Arrangement The basic arrangement of the Instrument is a ‘3U’ high, 483mm (19”) chassis for rack mounting, or alternatively, it may be supplied with a case for bench mounting. All power input, output and gas connections are via the rear panel. Power connection is via a standard three-way IEC power plug.

  • Page 10: Power Supply Setting & Connections

    2.3 Power Supply Setting & Connections 2.3.1 Power Supply Setting The instrument operates from single phase, 110, 220 or 240 volts nominal AC, at 50 or 60 Hz. The supply frequency is not critical, but the voltage must be set on the instrument to suit the local power supply.

  • Page 11: Serial I/O (Rs232C)

    Route signal cables well away from power cables, switchgear and other noise sources. For long cable runs, and in electrically noisy environments, optical RS232C cable extenders are recommended. Contact ADC (Spares & Service) Ltd. or their local authorised agents for advice. 2.5 Analogue Outputs Analogue outputs are provided for connection to chart recorders, remote meters, analogue logging equipment etc.

  • Page 12: Setting The Analogue Outputs

    Voltage Channel 1 Channel 1 Channel 2 Channel 2 Channel 3 Channel 3 Channel 4 Channel 4 NOTES: 1. V is used to indicate pin functions when output is set to voltage mode 2. I is used to indicate pin functions when output is set to 4..20mA mode 3.

  • Page 13: Alarm (Trip) Outputs

    Alarm contact outputs are available via a 14 way Amphenol connector on the rear panel. A suitable connector is provided in the kit with each instrument, and further supplies are available from ADC (Spares & Service) Ltd. or their authorised local agent. The connector pin functions are printed on the rear panel adjacent to the connector, and the pin numbering scheme is shown in Fig 4.

  • Page 14: Gas Arrangements

    Unless the gas is perfectly clean and dry, particulate filters and / or driers must be fitted externally. Contact ADC (Spares & Service) Ltd. or their authorised local agents for advice. The requirements for particular gases vary with the application and therefore these and the gas circuit are specific to the delivered Instrument.

  • Page 15: The Span Gas

    To prevent the possibility of condensation in the Instrument if the Instrument is not in continuous use, it is recommended that it is left Switched on with the Sample Pump Switched off. Samples may contain other gases which ‘interfere’ with the gas being measured. The extent to which known interferents can affect the measurement are defined in the Instrument Specification.

  • Page 16: The Exhaust Gas

    An indicating form of calcium sulphate (CaSO ) known as 'DRIERITE' is normally supplied with new instruments and replacement supplies are available from ADC (Spares & Service) Ltd or their local authorised agents. In use, drierite changes from blue to pink as it becomes exhausted, making it obvious when the container should be refilled with fresh chemical.

  • Page 17: Carbon Dioxide

    Under normal use, the quantity supplied will last for about 6 months to a year. Replacements can be obtained from ADC (Spares & Service) Limited who will also advise on the use of chemicals obtainable by the User.

  • Page 18: Gas Leaks

    • the cylinders are securely located. • the cylinders are fitted with a two-stage regulator. • the cylinders contain the correct gas mixture for use. • the cylinders are connected to the correct ‘entry’ on the Instrument. • the cylinder's Output Pressure regulator is 'OFF'. During use, check - •...

  • Page 19: Setting Up

    3. S ETTING 3.1 Preview This section describes the settings available from the front panel. Factory settings have been chosen to suit the general application of the instrument, or in accordance with the particular instructions specified previously by the user. 3.2 On Power Up IMPORTANT: Before operating the Instrument, ensure all the relevant installation checks have been carried out [refer to Section 2.9], and that if a filter column is...

  • Page 20: Display & Keypad

    If the discrepancy is less than 0.5% of full scale, the intervals can be increased, or if this is not accurate enough, decreased. Generally Zeroing is required more often than Spanning, so that typically a daily Zero, with weekly Span is adequate. The instrument can be set to automatically adjust zero on a periodic basis.

  • Page 21: Function Keys

    contrast adjustment. If it is not possible to get good contrast within the range of the bar, press the ‘Default’ key, then, using a 2mm flat-bladed screwdriver, adjust the ‘LCD’ control through the labelled hole in the back panel for best display. Note that the rear panel control has a wide range and the display will not be visible for extreme settings.

  • Page 22: Analogue (Chart) Outputs

    3.5 Analogue (Chart) Outputs An analogue output is provided for each gas measured (up to 4 channels). The outputs are available from a circular DIN type connector on the rear panel. Outputs are set for 0..10V at the factory, though they can be changed for voltage output of 0..1V, 0..5V, 0..10V or current output 4..20mA.

  • Page 23: Rs232C Serial Port

    ‘Hi point’ to set a gas value above which the trip is active. If there is no reading shown under this column on the display, or if the ‘Off’ key is used when setting the low point, this trip will not respond to high readings. Note: setting both high and low trip points will give a range indication.

  • Page 24: Measurement

    The gas ranges, display format and units of measurement are factory set to order, and no changes are possible. If changes to ranges or gases are required, contact ADC (Sales & Service) Ltd. or their local authorised agents for a quotation.

  • Page 25: Calibration

    Note: because the instructions will vary slightly from gas to gas, the instructions given here are fairly general. ADC (Spares & Service) Ltd. or their authorised local agent will be pleased to answer any questions.

  • Page 26: Manual Zero

    4.3.1 Manual Zero 1. Select 'Zero Adj. ' on main menu, which will display the zero screen and apply zero gas to the analyser bench(s). 2. Verify that the flow meter shows adequate flow – zero adjustment cannot be made if the flow is incorrect. If necessary, make small adjustments to zero gas pressure to correct the flow.

  • Page 27: Span Adjustment

    If possible, verify the gas concentration on a second analyser, or try another bottle of span gas. If the span fails and the span gas is correct, contact ADC (Spares & Service) Ltd., or their local authorised agents for service.

  • Page 28: Maintenance

    5. M AINTENANCE 5.1 Routine Checks Problems with the Instrument can be avoided if the installation is maintained regularly, especially with regard to parts used to pre-condition or route the various gases, and in particular the sample gas. The User should be aware of any constituents of the gas that may directly or indirectly affect the optical components within the instrument as described in Section 2.7.2.

  • Page 29: Instrument Checks

    5.2 Instrument Checks The instrument requires little maintenance, other than the filter column (if fitted), source block purge (if fitted), sample flow adjustment (if necessary), and zero and span adjustment (see section 4). 5.2.1 Source Block Purge (when fitted) Certain instruments fitted with the ‘SB’ type IRGA bench have a CO trap to remove traces of the gas from the source block.

  • Page 30: Throttles

    5.2.4 Throttles The sample and zero gas flows are normally set in the instrument with internal throttles, as indicated in the Gas Circuit. These paths can also become affected by blockages and they (or some other reason) may require some re-adjustment. Readjustment is not a routine procedure –...

  • Page 31: Optical Bench Descriptions

    6. O PTICAL ENCH ESCRIPTIONS 6.1 Introduction This section describes the basic construction and operation of the various types of bench that may be fitted in an instrument. All the infrared types rely on a characteristic of heteroatomic gases to absorb energy at specific wavelengths in the infrared spectrum, and, follow the operating principles described in Section 1.6.1.

  • Page 32: Sb Bench

    A typical GC Bench layout is shown in Fig. 13. This reflects a ‘single’ analysis cell. Variations on this will be on the length of cell or the number of cells. The length of the cell is dependent on the concentration of the sample measured and may vary from 1mm (at very high concentration) up to about 250mm (at low concentration).
  • Page 33 The source housing is filled with 'Zero Gas' if the air would otherwise interfere. For some applications, this is provided by a chemical held in a glass container screwed into the side of the housing. Infrared Source Soda Lime Spacer Analysis Window Window...

  • Page 34: Electrical Specifications

    7. E LECTRICAL PECIFICATIONS For specifications relating to gas measurements, refer to the Certificate of Conformity. 7.1 Power Supply Voltage: 240V ±10% 220V ±10% ] as set on rear panel 110V ±10% Frequency: 47 – 63Hz Maximum Power Consumption: 120VA 7.2 Analogue Outputs Outputs are not isolated.

  • Page 35: Serial (Rs 232) Port

    Relay Connectors 1 & 8 2 & 9 3 & 10 4 & 11 5 & 12 Not used + 15V 7.4 Serial (RS 232) Port The port signal levels correspond nominally to RS232C specifications; however the output is approximately ± 9V into 7kΩ.

  • Page 36: Spare Parts

    8. S PARE ARTS The following table lists some of the more common spare parts. ADC (Spares & Service) Limited provided total parts support and can quote for any item not listed – just contact us or our authorised local agent.

  • Page 37: Moisture Sensor Option

    The SHAW SDT sensor is a 2 wire loop powered transmitter using a high capacitance sensing element. Each unit is pre-calibrated before use with an accuracy of +/- 2C dewpoint measurement. The sensor signal is converted to a voltage directly integrated into the MGA3000 series electronics. The range of measurement is scaled as per the transmitter 9.1.1 MGA3000 Zero Calibration...

  • Page 38: Pre-Conditioning The Transmitter

    The following steps describe the process of setting the auto cal, describing the two different methods where different. Note:- The SDT must be connected to its normal indicator so that readings can be taken or, where no indicator is employed, an accurate measurement of the mA output must be taken.
  • Page 39 The SDT will now output the corrected dewpoint and can be reinserted into the process. 9.1.7 Faults/Errors • If the sensor is short-circuited, the transmitter will produce a constant 20.75mmA output • If the sensor is open-circuited, the transmitter will produce a constant 20.75mmA output...
  • Page 42 ADC Gas Analysis Ltd or its distributor will accept old analysis units before 2005 but retain the right to charge their disposal unless the unit is being replaced by new equipment.
  • Page 43 Authorised Local Agent: ADC Gas Analysis Limited Unit 35 Hoddesdon Industrial Centre Pindar Rd, Hoddesdon Herts, EN11 0FF United Kingdom Tel: +44-1992478600 Fax: +44-1992478938 Email: sales@adc-analysers.com Web: http://www.adc-analysers.com...

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