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Zellweger MINIGAS MK5 Operating Instructions Manual

Multiple display 4-in-1 gas monitor
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MAN0585.PM6
Issue 01 - 11/99
2987M5023
MINIGAS MK5
MULTIPLE DISPLAY 4-IN-1
GAS MONITOR

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  • Page 1 MAN0585.PM6 Issue 01 - 11/99 2987M5023 MINIGAS MK5 MULTIPLE DISPLAY 4-IN-1 GAS MONITOR...
  • Page 2 Ensure that you read and understand these Operating Instructions BEFORE operating any part of the Minigas Mk5. The Minigas Mk5 has been approved as intrinsically safe by authorities throughout the world. It is important that, as a matter of safety, the conditions of those approvals are maintained.
  • Page 3 2987M5023 WARNINGS AND CAUTIONS WARNING The Minigas Mk5 is to be serviced, and the battery charged, only in a safe area. Substitution of components may impair the intrinsic safety of the Minigas Mk5. Replacement parts must be approved by Zellweger Analytics.
  • Page 4 Chapter 6). HELP US TO HELP YOU Every effort has been made to ensure the accuracy in the contents of our documents, however, Zellweger Analytics Limited can assume no responsibility for any errors or omissions in our documents or their consequences.
  • Page 5 I suggest the following corrections/changes be made to Section ... Marked up copies attached (as appropriate): Yes / No Please inform me of the outcome of this change: Yes / No For Marketing Communications, Zellweger Analytics Limited: Actioned By Date: Response: Date:...
  • Page 6 MAN0585.P65 Issue 01 - 11/99 2987M5023...

  • Page 7: Table Of Contents

    Issue 01 - 11/99 2987M5023 CONTENTS Section Page 1. GENERAL DESCRIPTION Introduction Brief description Accessories provided with the Minigas Mk5 Software options 2. USING THE MINIGAS MK5 Introduction Front panel display format Preparation for use Switching on 2.4.1 Start-up sequence 2.4.2 Displaying the instrument serial number 23...
  • Page 8 3. USE AND TRANSFERRING DATA AFTER USE Introduction Confined space entry 3.2.1 Initial area check 3.2.2 Confined space entry checks 3.2.3 Adsorption of toxic gases Normal use of the Minigas Mk5 Area monitoring Storage of the Minigas Mk5 Data transfer after use 4. ROUTINE MAINTENANCE General 4.1.1 Preventive maintenance...
  • Page 9 Issue 01 - 11/99 2987M5023 CONTENTS Charging the rechargeable battery 4.3.1 General 4.3.2 Fast charger 4.3.3 Trickle charger 4.3.4 Charging the Minigas Mk5 batteries Changing dry-cell batteries Sensor grill filter replacement Service 5. FIELD SETTABLE ALARM MODE Introduction 5.1.1 General 5.1.2 Field settable alarms...
  • Page 10 1. Minigas Mk5 alarm signal bleep patterns 2. Minigas Mk5 warning codes 3. Minigas Mk5 fault codes FIGURES 1. Display screen selection sequence 2. Minigas Mk5 fitted into a battery charger 3. Minigas Mk5 sensor layout 4. Gas calibration kit...

  • Page 11: General Description

    This section describes the standard and optional features of the Minigas Mk5 instrument. The Minigas Mk5 is a small, portable gas monitor designed to be carried or worn without hindering the user. Its purpose is to monitor the atmosphere continuously for hazardous levels of four gases simultaneously.

  • Page 12: Brief Description

    Analytics sensors. Audible and visual alarms alert the user to the danger when hazardous or dangerous conditions are detected. Central to the operation of the Minigas Mk5 is a microprocessor which provides a multiple-display digital readout of real-time concentrations of the four gases and their associated peak readings.

  • Page 13: Software Options

    SOFTWARE OPTIONS The following programmable facilities can be configured into the Minigas Mk5, either at the time of ordering the instrument or as a subsequent modification. However, it should be noted that certain options are incompatible with each other - for example, the AutoZero and Standby mode options are not available with G o / N o G o i n s t r u m e n t s .
  • Page 14 MAN0585.P65 Issue 01 - 11/99 2987M5023 1. GENERAL DESCRIPTION Option Brief Description Peak (low) Display of the minimum oxygen measurement since switch on, or since the last peak reset. Available for oxygen channel only. Peak (high) Display of the maximum measurement since switch-on, or since the last peak reset.
  • Page 15 For example, if a low-oxygen alarm is used to indicate that breathing apparatus must be used, the Minigas Mk5 can continue to be used to sense for explosive conditions. Forced Response When the low battery indication first appears, to Low Battery it must be acknowledged.
  • Page 16 Available either as a fixed log, where logging stops when the log store is full, or as a rotating log where logging continues after the store is full by overwriting the oldest data. Also permits a calibration due date to be programmed into the Minigas Mk5.
  • Page 17 24-hour clock (see Section 2.7.4). Countdown Provides an alarm signal at preset intervals Stopwatch Alarm to remind the Minigas Mk5 user to carry out specific tasks. For example, lone workers in confined spaces may be required to establish regular contact with their control-centre in order to confirm their safety (see Section 2.4.4).
  • Page 18 MAN0585.P65 Issue 01 - 11/99 2987M5023...

  • Page 19: Using The Minigas Mk5

    I/O (on/select) button on the left-hand side of the Minigas Mk5. In this context, short is for a single bleep, medium is for two bleeps and long is for three bleeps.

  • Page 20: Front Panel Display Format

    MAN0585.P65 Issue 01 - 11/99 2987M5023 2. USING THE MINIGAS MK5 FRONT PANEL DISPLAY FORMAT Left Alarm Light Right Alarm Light Liquid On/Select Crystal Backlight Button Display Button The main parts of the liquid crystal display are the four banks of 7-segment digits.

  • Page 21: Preparation For Use

    (double ) alarms. PREPARATION FOR USE Before using the Minigas Mk5 it is recommended as safe working practice always to connect a freshly charged NiMH battery pack, or recharge the battery pack fitted. In the case of the dry-cell version, replace all four of the AA cells.
  • Page 22 After two seconds, the final start-up screen is displayed, which consists of all the display segments flashing followed by the alarm indicators flashing accompanied by a rapid bleeping audio tone. The Minigas Mk5 is now in Display Mode (see Section 2.7).

  • Page 23: Displaying The Instrument Serial Number

    That is, the process of logging the measurement data and alarms should not interfere in any way with the conventional use of the Minigas Mk5 as a personal gas monitor. Consequently, any warnings associated with this facility appear only during the start-up sequence;...

  • Page 24: If Countdown Stopwatch Alarm Is Configured

    I/O button. Log Full If the Minigas Mk5 is configured to have a fixed log and the log store is full, LOG Full appears in the upper two banks. This warning indicates that the instrument will not log any more data until the current data has been downloaded (see Section 3.6).
  • Page 25 (see below). If the time displayed is satisfactory for the current use of the Minigas Mk5, wait 10 seconds for the normal Display Mode screen to appear. The stopwatch alarm countdown does not start until the Display Mode screen is displayed.

  • Page 26: Switching Off

    If the timer duration is incorrect and the Minigas Mk5 changes to Display Mode before it can be adjusted, switch the Minigas Mk5 off and then on again, and repeat the setting procedure. Note: The Countdown Stopwatch Alarm may be disabled by setting the timer duration to zero hours and zero minutes.

  • Page 27: Display Mode

    2. USING THE MINIGAS MK5 DISPLAY MODE 2.7.1 General It is possible to have various arrangements of the Minigas Mk5 screens, but these must be defined when ordering the instrument. Normally, five screens are provided in the Display Mode: Instantaneous exposure levels of all four gases.

  • Page 28: Display Screen Selection Sequence

    MAN0585.P65 Issue 01 - 11/99 2987M5023 2. USING THE MINIGAS MK5 START INST AUTOZERO (Explosive and Toxic) Instantaneous AutoSpan Exposure (Oxygen) Display ELAPSED STANDBY TIME MODE CLOCK PEAK PEAK RESET Peak LTEL FOR DISPLAY Display SCREEN DETAILS (A) TO (E) REFER Toxic LTEL TO SECTION 2.7.2...

  • Page 29: If Countdown Stopwatch Alarm Is Configured

    MAN0585.P65 Issue 01 - 11/99 2987M5023 2. USING THE MINIGAS MK5 Toxic LTEL (long term exposure level) Display The LTEL ( ) arrow is highlighted. The time weighted averages for exposure to the two toxic gases over an 8 hour reference period are indicated. Refer to the Glossary appendix for a description of the term LTEL.

  • Page 30: Time-Of-Day Display

    MAN0585.P65 Issue 01 - 11/99 2987M5023 2. USING THE MINIGAS MK5 Pressing the I/O button steps through any other optional screens that have been configured (such as Peak measurements). The time remaining display counts down in 1-minute steps. Press the I/O button to return to Display Mode.

  • Page 31: Zero Setting

    (or 20.9% for oxygen) during the initial 60-second period after switch on. Note: It is important that the Minigas Mk5 is AutoZeroed only in clean, fresh air. AutoZero the Minigas Mk5 by selecting the INST ( ) display and applying a long press to the I/O button.

  • Page 32: Resetting Peak Readings

    -0.1% to +0.1% VOL If a reading has drifted too far from its zero point, then the Minigas Mk5 will not AutoZero that reading but will give an error bleep (see Section 2.18). If this occurs, first ensure that the instrument is monitoring clean, fresh air and try to AutoZero again.

  • Page 33: Watchdog Signal

    2. USING THE MINIGAS MK5 2.10 WATCHDOG SIGNAL 2.10.1 General When the Minigas Mk5 is operating normally in a safe gas environment and no alarms and warnings have occurred previously then, as a confidence check, a watchdog signal recurs at 10-second intervals. This signal consists of a brief audio bleep accompanied by a short flash on the green indicator lights.

  • Page 34: Standby Mode

    MAN0585.P65 Issue 01 - 11/99 2987M5023 2. USING THE MINIGAS MK5 -O- for oxygen, -F- for explosive gas, -C- for carbon monoxide, -H- for hydrogen sulphide, -L- for chlorine, -S- for sulphur dioxide, -d- for carbon dioxide. It is not possible to change the display from this simplified instantaneous screen.

  • Page 35: Autorotate

    Standby Mode but the explosive sensor circuit reverts to continuous monitoring. 2.13 AUTOROTATE When the Minigas Mk5 is operating in Display Mode and has the Autorotate software option configured, the display scrolls through the available screens allowing approximately three seconds per screen.

  • Page 36: Alarms

    2. USING THE MINIGAS MK5 2.15 ALARMS 2.15.1 General The Minigas Mk5 has a number of alarm modes indicating a hazardous or dangerous environment, low battery condition or an instrument malfunction. When the concentration of any gas exceeds the instrument alarm level, the backlight and red alarm lights flash and the audio alarm sounds.

  • Page 37: Audio Alarms

    Software option 2: Dual alarm bleep disabled, warning alarm bleep enabled. The various Minigas Mk5 bleep patterns are defined in Table 1 as a series of bleep/pause phases of specified duration, where: <HiXXXms> is a high tone (2560Hz) bleep for XXX milliseconds, <Lo XXXms>...
  • Page 38 1 and 2) Explosive danger <Hi 125ms> <pause 500ms> repeat... Full alarm (software option 2) xic and oxygen <Hi 63ms> <pause 125ms> <Hi 63ms> Full danger alarm <pause 500ms> repeat... (software option 2) Table 1 Minigas Mk5 Alarm Signal Bleep Patterns...

  • Page 39: Alarm Priority

    The watchdog signal also remains dormant during the time- out period, but thereafter gives a double-bleep signal (Table 1) to indicate that the Minigas Mk5 has registered at least one hazard during the current period of use. 2.15.5 Alarm Priority...

  • Page 40: Instrument Warnings And Faults

    Table 2 Minigas Mk5 Warning Codes 2.16 INSTRUMENT WARNINGS AND FAULTS The Minigas Mk5 incorporates a continuous self-checking facility to monitor the correct functioning of the instrument. The most common fault that is likely to occur is an exhausted battery, for which a warning indication is given (see Section 2.18).

  • Page 41: Operational Error Indication

    (see Section 4.6 for Service details). 2.17 OPERATIONAL ERROR INDICATION If the Minigas Mk5 detects an operational error (for example, a calibration failure in EasyCal mode, or an attempt to AutoZero a reading that is outside the preset limits), the error bleep sounds and the red lights flash.

  • Page 42: Battery Voltage Indication

    Issue 01 - 11/99 2987M5023 2. USING THE MINIGAS MK5 If this happens, the Minigas Mk5 must be switched off and the work area vacated immediately. If a Minigas Mk5 is switched on with a completely exhausted (or faulty) battery, the message FLt 800 will be displayed for as long as the I/O button is pressed.
  • Page 43 Switching on with flat batteries. Replace/recharge the batteries. ROM error. Return the instrument to Zellweger Analytics for servicing. Note: Refer to Section 4.6 for information on returning an instrument to Zellweger Analytics or their local agent. Table 3 Minigas Mk5 Fault Codes...
  • Page 44 MAN0585.P65 Issue 01 - 11/99 2987M5023...

  • Page 45: Use And Transferring Data After Use

    (eg domestic furniture polish). If the Minigas Mk5 is exposed to one or more of these substances, then the explosive channel response must be checked and recalibrated if necessary.

  • Page 46: Confined Space Entry

    Attach a lanyard or rope to the Minigas Mk5 and lower it into the confined space. Remove it after a 5 minute sample has been taken. If it is then giving an alarm indication, note the hazardous condition and refer to supervisory personnel.

  • Page 47: Adsorption Of Toxic Gases

    Section 3.2.3. If no alarm has occurred during the above checks, remove the aspirator (if fitted) and enter the work area ensuring that the Minigas Mk5 is worn with the sensor grill facing outwards towards the breathing zone. 3.2.3 Adsorption of Toxic Gases...

  • Page 48: Normal Use Of The Minigas Mk5

    NORMAL USE OF THE MINIGAS MK5 When working in a potentially hazardous environment, the Minigas Mk5 must be kept switched on and worn as close to the breathing area as possible. To this end, accessories are available to allow the instrument to be worn in a number of different ways (refer to Section 8 for a list of these accessories).

  • Page 49: Area Monitoring

    STORAGE OF THE MINIGAS MK5 CAUTION If a dry-cell Minigas Mk5 is to be placed in storage for long periods, the cells MUST be removed from the battery pack (see Section 4.4). As a general rule, the storage temperature for a Minigas Mk5 with its sensors fitted should be between 0°...

  • Page 50: Data Transfer After Use

    Manual (provided as part of the LogView software interface kit). Ensure that the computer is displaying the message: Insert Monitor into Transfer Unit and Switch On Press START When Done Ensure that the Minigas Mk5 is switched off and then remove its battery pack.
  • Page 51 The Data Transfer Unit is similar physically to the Minigas Mk5 battery pack. Fit this unit to the Minigas Mk5 in the same manner as fitting a battery pack. Switch on the Minigas Mk5 by pressing and releasing the I/O button in the usual manner.
  • Page 52 Normally, the Minigas Mk5 is switched off automatically at the end of the data transfer. If, for any reason, this does not happen, switch off the Minigas Mk5 by pressing and holding the I/O and O buttons until OFF is displayed on the instrument.

  • Page 53: Routine Maintenance

    MAN0585.P65 Issue 01 - 11/99 2987M5023 4. ROUTINE MAINTENANCE WARNING The substitution of components in the Minigas Mk5 may impair its' intrinsic safety. CAUTION The Minigas Mk5 must be serviced by qualified personnel only. GENERAL Routine Maintenance consists of Preventive Maintenance (Section 4.1.1) and Corrective Maintenance (Section 4.1.2).

  • Page 54: Corrective Maintenance

    Calibrate the Minigas Mk5 at six month intervals (or after repair) or, in the case of datalogging instruments, when the CAL dUE ‘date exceeded’ warning occurs during the startup sequence.

  • Page 55: Changing The Battery Pack

    To fit the battery pack to the Minigas Mk5, ensure that the electrical contacts between the battery pack and the instrument are in line, then hold both spring-loaded studs depressed while pushing the battery pack into place.

  • Page 56: Charging The Rechargeable Battery

    Analytics warranty. Two types of battery charger (see Section 8) are available for recharging the Minigas Mk5 NiMH batteries – a fast charger (Section 4.3.2) and a trickle charger (Section 4.3.3). Figure 2 Minigas Mk5 fitted into a battery charger 4.3.2...

  • Page 57: Trickle Charger

    19 hours, although it is safe to leave it on charge for longer periods. 4.3.4 Charging the Minigas Mk5 Batteries The following procedure for battery charging applies to all types and variants of the battery charger. The battery charger has been designed as a bench mounting unit and it should be placed on a horizontal surface when in use.
  • Page 58 Use a paper tissue or soft lint-free cloth to clean the contacts, do not use any form of abrasive cleaner. Insert the battery pack (or, after removing its protective sleeve, the complete Minigas Mk5 instrument) into the battery charger. The battery pack can only be located in the charger in one orientation (see Figure 2).

  • Page 59: Changing Dry-Cell Batteries

    Mk5 are as follows: Rayovac 815; Duracell MN1500 or Ever Ready LR6/E91 Energiser. Ensure that the Minigas Mk5 is switched off and then remove the battery pack (Section 4.2). This is necessary in order to locate the hexagonal wrench (2.5mm A/F Allen key) stowed inside the end of the battery pack.

  • Page 60: Sensor Grill Filter Replacement

    Mk5 is used in an area where welding work is being undertaken. Using the hexagonal wrench (2mm A/F Allen key) provided with the Minigas Mk5, remove the sensor grill (secured by three screws). Remove, and retain, the Neoprene seal. Lift out, and discard, the old filter.

  • Page 61: Service

    Neoprene seal inside it and the clean filter (smooth side against the Neoprene seal) on top of the seal. Then place the Minigas Mk5 instrument onto the sensor grill (not vice versa) and turn the two items over together.
  • Page 62 2987M5023 4. ROUTINE MAINTENANCE The Minigas Mk5 is manufactured to the specifications applicable at that time. Zellweger Analytics is under no obligation to update or modify products once sold. If an apparent instrument malfunction occurs: Read this Manual carefully, ensuring that the problem cannot be easily corrected and is not a user fault.

  • Page 63: Field Settable Alarm Mode

    Field Settable Alarm mode allows the user to observe and, if necessary, change some of the factory-set alarm points directly on the Minigas Mk5 unit itself without the requirement, as previously, of having to connect a personal computer to the instrument.

  • Page 64: Changing Alarm Levels

    5.2.2 Entering Field Settable Alarm Mode Ensure that the Minigas Mk5 is switched off, and remove the sleeve. Identify the calibration button anti-tamper screw at the top left of the instrument just to the rear of the sensor grill.

  • Page 65: Oxygen Alarms

    Enter Field Settable Alarm mode by holding the calibration button depressed while switching on the Minigas Mk5, ie while pressing and releasing the I/O button. The AdJ AL. screen is then displayed. Select No to return to the normal start-up sequence, or Yes to continue with the alarm setting adjustments.

  • Page 66: Explosive Alarms

    MAN0585.P65 Issue 01 - 11/99 2987M5023 5. FIELD SETTABLE ALARM MODE Make the required changes to the oxygen low alarm setting and then press the calibration button to step on to the -O- Hi screen indicating the current oxygen instantaneous high alarm trigger level. Make the required changes to the oxygen high alarm setting and then press the calibration button to obtain the AdJ -F- (explosive gas) screen.

  • Page 67: Toxic Alarms

    MAN0585.P65 Issue 01 - 11/99 2987M5023 5. FIELD SETTABLE ALARM MODE Select Yes to obtain the -F-Hi screen indicating the current explosive instantaneous high alarm trigger level. Make the required changes to the explosive high alarm setting and then press the calibration button to step on to the -F-Hi2 screen indicating the current explosive instantaneous very high alarm trigger level.
  • Page 68 MAN0585.P65 Issue 01 - 11/99 2987M5023 5. FIELD SETTABLE ALARM MODE sulphide (-H-). If other toxic sensors are fitted in the instrument under test, then the corresponding sensor identification appears instead of C and H. Obtain the AdJ-O- screen (see Section 5.2.3) and keep selecting ‘No’...
  • Page 69 MAN0585.P65 Issue 01 - 11/99 2987M5023 5. FIELD SETTABLE ALARM MODE Make the required changes to the Toxic 1 very high alarm setting and then press the calibration button to step on to the -C-StL screen indicating the current Toxic 1 STEL alarm trigger level.

  • Page 70: Conclusion

    INDICATION OF USER CONFIGURATION Once the alarm settings have been changed from the factory configuration settings, the Minigas Mk5 will display USr as the configuration code at start-up. This replaces the previous factory code (for example A02).

  • Page 71: Calibrating The Minigas Mk5

    Tests of this nature are generally referred to as gas response checks. The Minigas Mk5 should be calibrated at intervals of six months or less, or after repair. The procedures described in this section assume that the instrument is a fully equipped Minigas Mk5.

  • Page 72: Tools And Test Equipment

    Minigas Mk5. Test gases contained in cylinders fitted with a low flow gas regulator (500ml/min for chlorine, 300ml/min for all other gases). Zellweger Analytics can supply suitable calibration gases in disposable cylinders - refer to Section 8 for part numbers.

  • Page 73: Preparation For Calibration

    Smoking or the use of butane lighters, solvents etc nearby can cause faulty, and hence potentially dangerous, calibration. Ensure that the Minigas Mk5 is fitted with either a fully charged battery pack or a new set of dry cells. 6.3.2...
  • Page 74 (with both ends pointing downwards) for at least 24 hours. DO NOT attempt to dry it with a compressed air supply as this may leave traces of silicone oil which can damage or affect the response of the Minigas Mk5 sensors. Flow Regulator Pressure...

  • Page 75: Purging The Gas Connections

    In this context, short is for a single bleep, medium is for two bleeps and long is for three bleeps. Some of the prompt screens appearing on the Minigas Mk5 display during calibration present the operator with a yes/no option (-y or n-).

  • Page 76: Entering Calibration Mode

    CO On entering Calibration Mode the Put Air screen is displayed. This is a prompt to put the Minigas Mk5 in a clean air environment. Take care not to breathe over, or near, the sensor grill while zero calibration is being performed.

  • Page 77: Span Calibration

    This is a prompt to apply a calibration gas or gas mixture for any of the fitted sensor channels. If it was necessary only to zero the Minigas Mk5 readings, select No to return to the normal instantaneous display.
  • Page 78 Having confirmed that the expected gas concentrations agree with the known test gas concentrations, fit the calibration hood to the Minigas Mk5 and turn on the test gas cylinder. From this point on, span calibration of the toxic and explosive channels is fully automatic and requires no adjustments or timing on the part of the operator.
  • Page 79 Note: The End GAS screen will time-out after 4 seconds and return to the ‘gassing-in-progress’ screen. When the Minigas Mk5 has been able to set the span for the respective channels, the screen indicates the sensor that has been calibrated and the gas concentration that it has been spanned to.
  • Page 80 2987M5023 6. CALIBRATING THE MINIGAS MK5 If there are other channels still to be calibrated, pressing either button returns the Minigas Mk5 to the Put <> GAS screens. In this case, repeat the above procedure from operation (4). Finally, when all channels have been calibrated successfully turn off the test gas and remove the calibration hood.

  • Page 81: Storage Of Calibration Results

    Zellweger or an Authorised Distributor for repair. 6.4.6 Storage of Calibration Results After calibration, the Minigas Mk5 stores the following data about the calibration session for downloading via LogView at a later date: Date when calibration was performed.

  • Page 82: Post Calibration

    2987M5023 6. CALIBRATING THE MINIGAS MK5 POST CALIBRATION On the successful completion of the calibration procedure(s): Switch off the Minigas Mk5 and disconnect all test equipment. Fit the calibration button anti-tamper screw and washer. 6.6 SETTING GAS BOTTLE CONCENTRATIONS If, at the start of span calibration, it is noted that the test gas concentrations certified on the gas cylinders being used differ from the expected concentrations shown on the Put <>...
  • Page 83 6. CALIBRATING THE MINIGAS MK5 Having set all channels to the appropriate expected test gas concentration, the final press on the calibration button returns the Minigas Mk5 to the Put <> GAS screens. Continue with span calibration from operation (4) in Section 6.4.4.
  • Page 84 MAN0585.P65 Issue 01 - 11/99 2987M5023...

  • Page 85: Specifications

    MAN0585.P65 Issue 01 - 11/99 2987M5023 7. SPECIFICATIONS MINIGAS MK5 SPECIFICATION 7.1.1 General Depth (overall): 55 mm (2.2 inches). Width: 90 mm (3.5 inches). Length: 190 mm (7.5 inches). Including sleeve, and either dry cell or rechargeable battery pack. Weight: 857 g (30.2 oz) dry-cell, zinc.
  • Page 86 Note: 1 Although the Minigas Mk5 is capable of displaying oxygen concentrations of up to 35% VOL, intrinsic safety approval is valid only up to 21% VOL.
  • Page 87 MAN0585.P65 Issue 01 - 11/99 2987M5023 7. SPECIFICATIONS Range Resolution Oxygen 0 to 34.9% VOL 0.1% VOL 0 to 21% VOL (for UL and BASEEFA) Carbon monoxide 0 to 999ppm 1ppm Hydrogen sulphide 0 to 499ppm 1ppm Chlorine 0 to 99.9ppm 0.1ppm Sulphur dioxide 0 to 99.9ppm...
  • Page 88 Typical alarm levels set in the Minigas Mk5 are listed below, but the instrument has a facility (referred to as Field Settable Alarm mode) which allows the user to change certain of the factory-set alarm points.
  • Page 89 80% rh (non-condensing). Intermittent: 99% rh (non-condensing). Note: The use of the Minigas Mk5 in hazardous areas is limited to +40°C. Storage of the Minigas Mk5 with its sensors fitted should be limited to the temperature range 0°C to +25°C.

  • Page 90: Battery Charger Specification

    7.1.9 Electromagnetic Compatibility Within the requirements of EMC Directive 89/336/EEC, the Minigas Mk5 has been tested to ensure that it is resistant to RFI, ESD and mains-transient interference. Similarly, tests have been carried out to ensure that the Minigas Mk5 does not produce electrical interference.

  • Page 91: Toxic Sensor Cross-Sensitivity

    This effect, known as cross-sensitivity, is shown in the table below which gives typical Minigas Mk5 readings obtained when a sensor is exposed to an ‘other gas’ concentration of 10ppm.
  • Page 92 MAN0585.P65 Issue 01 - 11/99 2987M5023 7. SPECIFICATIONS CAUTION Because of the cross-sensitivity of chlorine and sulphur dioxide sensors to hydrogen sulphide, instruments configured for monitoring chlorine or sulphur dioxide are NOT suitable for use in atmospheres in which these gases and hydrogen sulphide co-exist.

  • Page 93: Optional Accessories And Spares

    Issue 01 - 11/99 2987M5023 8. OPTIONAL ACCESSORIES AND SPARES The following accessories and spares may be purchased from Zellweger: Fast Battery Charger PMC F240 00 One-way, 200V to 260V, 50Hz, UK plug. PMC F240 4W Four-way, 200V to 260V, 50Hz, UK plug.
  • Page 94 10. Bulb Operated Hand Aspirator Assembly P300 0708 00 3-metre. P300 0717 00 5-metre. Clips onto the Minigas Mk5 grill. This item is NOT suitable for sampling chlorine gas. Aspirator Hose Extension P300 0727 00 10-metre. Ball Float...

  • Page 95: Gas Calibration Kit

    PGAS KITMGAS 00 All gases except chlorine. PGAS KITMGAS C Chlorine only. Calibration Gas Cylinders Contact Zellweger Analytics or their local agent for details. Aspirator Plate/Calibration Hood P325 9374 00 Aspirator Plate/Calibration Hood. Sensor Grill Filters P325 9992 00 Goretex.
  • Page 96 8. OPTIONAL ACCESSORIES AND SPARES Miscellaneous Items P017 0108 00 Neck Strap. P088 0371 00 Plastic Belt Clip. P035 0068 00 Minigas Mk5 and Accessories Carrying Case. LogView Software Interface Kit. For use with datalogging instruments and includes the LogView software discs, a User...
  • Page 97 Issue 01 - 11/99 2987M5023 A. GLOSSARY The following abbreviations and terminology are used in this manual and/or appear on the Minigas Mk5 display screens, front panel and labels. AdJ AL. Field Settable Alarm mode. Across flats (hexagonal wrench size).
  • Page 98 Hydrogen sulphide. INST Instantaneous measurement. Intrinsically safe (approval by an appropriate authority to use the Minigas Mk5 in hazardous areas). Pellistor linearisation coefficient. Lower explosive limit - the lowest gas concentration that can cause an explosion (approximately 5% by volume, methane in air).
  • Page 99 Standards Authority of Australia. Safe area Work area in which there is no danger of contamination with an explosive atmosphere. SEt rtc Minigas Mk5 internal clock/calendar needs to be reset. Short press Press and keep pressed for one bleep only, then release.
  • Page 100 MAN0585.P65 Issue 01 - 11/99 2987M5023 A. GLOSSARY averaged over 15 minutes equals 15ppm. Underflow - measurement outside (below) the instrument range. Underwriters Laboratories Inc. % VOL Percentage of the total volume. Watchdog Audible and visual confidence check repeated at 10-second intervals. Toxic sensor - carbon monoxide.

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