Gas Data GFM 436 User manual

GFM 436

 
 

 
 
1 Document revision history ...............................................................................................................5 
 
1 Introduction......................................................................................................................................6 
Features..................................................................................................................................................6 
2 Spares list..........................................................................................................................................7 
 
1 Important safety related points .......................................................................................................9 
 
1 Introduction to the GFM436 Functions and Features....................................................................10 
2 GFM436 Instrument Specification .................................................................................................12 
3 Specialist Functionality...................................................................................................................13 
3.1 Lower Explosive Limit..................................................................................................................13 
3.2 Managing hydrocarbons using the hexane channel ...................................................................13 
3.3 PID Compensation Factor Prediction ..........................................................................................14 
4 Third Party Approvals.....................................................................................................................15 
4.1 ATEX.............................................................................................................................................15 
 
1 Optional Extra Accessories.............................................................................................................17 
 
1 Starting Up......................................................................................................................................18 
2 Navigating the Screens of the GFM436..........................................................................................20 
3 Starting Up......................................................................................................................................21 
4 Taking a Gas Measurement............................................................................................................22 
4.1 Connecting the gas sample pipe .................................................................................................22 
 
1 Gas Display Two..............................................................................................................................25 
 
1 Connecting the gas flow pipe.........................................................................................................27 

 
 
3 
8.2 Taking a Static Pressure (SP) Measurement..................................................................................30 
 
9.1 Gas velocity Measurement with optional vane anemometer .......................................................32 
 
10.1 Gas Temperature Measurement with optional temperature probe...........................................34 
10.2 DIP Meter Reading .......................................................................................................................35 
 
11.1 Gas Temperature Measurement with optional temperature probe...........................................36 
 
12.1 Sample Point Setup ......................................................................................................................37 
12.2 Logging Setup ...............................................................................................................................40 
12.3 View reading display.....................................................................................................................40 
12.4 Clock Display.................................................................................................................................43 
12.5 Store Menu...................................................................................................................................44 
12.6 User Calibration............................................................................................................................45 
12.7 Auto Turn Off................................................................................................................................45 
 
Low battery warning ............................................................................................................................46 
Batteries ...............................................................................................................................................46 
Changing the gas filter..........................................................................................................................48 
 
User calibration display........................................................................................................................49 
 
Logging setup........................................................................................................................................54 
 
Logging display .....................................................................................................................................57 
 
 
Hazardous areas classified by zones ....................................................................................................62 
Different types of gas ...........................................................................................................................62 
Design and construction of intrinsically safe instruments for use in flammable atmospheres ..........63 
Testing and certification.......................................................................................................................64 

Different types of gas ...........................................................................................................................65

Important notes ...................................................................................................................................65

Response Time .....................................................................................................................................66

Technical data –MiniAir 6 Micro .........................................................................................................66

Cleaning and maintenance...................................................................................................................66

General handling tips ...........................................................................................................................67

Cleaning instructions............................................................................................................................67

Conditions and exclusions....................................................................................................................70

Disposal ................................................................................................................................................70

Issue: A

Revision: 2

Date: 24/11/2022

ISSUE

REV

DATE

REVISION DESCRIPTION

19/12/2013

Initial Release

28/11/2022

Brand Update

The Gas Data GFM436 handheld series of analysers is designed specifically for monitoring and analysing gas

content of landfill, biogas and contaminated land sites. It measures the methane, oxygen and carbon dioxide

content of site gases, gas pressure or vacuum, and gas velocity.

Operation is extremely simple, yet the readings obtained are

highly accurate. The instrument uses Gas Data's proprietary

infra-red methane and carbon dioxide sensors and a

combination of industry standard electrochemical gas sensor

cells. A variety of external sensors can be plugged in, e.g. vane

anemometer to measure gas velocity or a temperature probe

for ambient and other temperatures.

The GFM436 series has rechargeable Nickel Metal Hydride

batteries giving around eight hours use between charges. A

battery charger and mains unit is supplied with the instrument

and a field replaceable battery pack is also available as an

optional extra.

Features

•Up to 7 gas analysis channels.

•4 Wavelength optical infra-red analyser.

•Atmospheric pressure.

•Powerful sample pump.

•User replaceable sample filter.

•Field replaceable/rechargeable battery pack.

•Optional flow, pressure and temperature.

Category

Description

GD order code

Filter

GFM External Filters 25mm

18810

GFM Internal Filters 15mm

18811

GFM External Filters 50mm

18818

Connector

GFM/Click! Sample Pipe Connector (Male Metal)

18812

GFM Sample Pipe Connectors (Female)

18813

GFM/Click! Sample Pipe Connector (Male plastic)

18934

Calibration Check Gas - On Demand Flow Regulator C10 - Stainless Steel

18496

Tube

GFM Sample Pipe

17227

GFM43x Sample Tube

17226

GFM43x/610 Flow Tube

16480

Cable

GFM Temperature Probe Extension Cable - 1m

19425

Vane Anemometer

16502

Brass Temperature Probe

16503

Temp Expansion inc. Brass Probe

18730

T-Piece Temperature Probe

17220

USB Download cable

16501

Battery pack

16457

Universal DC In-Car Multi Voltage Power Adaptor

21266

AC Mains Battery charger

16455

Casing

Inlet housing

17204

Battery cover

17203

Leather cover

16781

Black carry case

16933

The Gas Data GFM has been designed to operate in typical field environments where flammable gases may be

present.

All ‘Special Conditions for Safe Use’ as detailed on the ATEX certificate (see Appendix F) must be adhered to.

The following points must be observed:-

•The instrument must be recharged in the non-hazardous area.

•The instrument must be checked for normal operation prior to carrying it into the hazardous

area:

oBEFORE entering a known hazardous zone, switch on the instrument and make sure

the display is visible and that the keys respond correctly.

oBEFORE entering a known hazardous zone, check that the sample pump can be

operated.

•The instrument must be inspected for damage prior to use and the instrument must not be

used if the case is damaged:

oBEFORE entering a known hazardous zone, check the instrument for damage. Pay

particular attention to the keyboard and aspirator.

•The instrument must be carried in the leather case to avoid the risk of electrostatic discharge:

oBEFORE entering a hazardous zone make sure that the instrument is securely enclosed

in its leather case.

_________________________________________________________________

Failure to comply the ‘Special Conditions for Safe Use’ can be potentially hazardous to the user and

others.

__________________________________________________________________

Warning

•The safest medium to sample a gas line with the instrument is to connect it to an isolated sample line,

accessible by a ball valve (or another suitable alternative).

•Sampled gas will be discharged from the ‘sample out’ port of the instrument at a rate of

approximately 500ml/min.

Make sure this gas will not create a hazardous zone worse than ZONE I See Appendix

B for full description of hazardous zones.

•Flush the instrument with clean air before sampling to prevent mixing potentially reactive mixtures of

gas within the instrument.

•Verify instrument calibration before and after use to minimise the risk of falsely determining an

atmosphere as hazardous or safe.

•Do not connect a GFM436 Series instrument to gas sources at greater than +50 mbar above

atmospheric pressure.

•Do not operate the GFM436 in ambient temperatures outside the range of -10 to +40 °C

•Do not attempt to dismantle the instrument. It contains no user replaceable parts.

•Do not operate the unit if it is damaged in any way (i.e. loose front panel, missing screws etc.).

•Do not connect or remove electrical connectors on the top of the instrument in the hazardous area.

•Do not use (i.e. power on) the instrument while charging.

•Only charge the batteries in a safe well-ventilated area using the charger supplied.

•Ensure correct filter is used on the Gas In port –If any doubt please contact Gas Data

•Use only Gas Data spares and accessories –See spares list.

For further information please refer to:

Error! Reference source not found.

Gas Data cannot accept any liability for loss or damage due to its usage. Satisfy yourself

that the unit is suitable for the application that you intend to use it for. If in doubt about the suitability of a

GFM426 Series instrument for a particular application call Gas Data Ltd for further advice.

The Gas Data GFM436 is an ATEX accredited hand-held gas analyser designed specifically for monitoring

and analysing soil gas parameters in greenfield and brownfield (contaminated land) sites and landfill

sites.

It is lightweight, small and robustly manufactured in a weather resistant case making it suitable for use

even in challenging field applications. It measures the methane, carbon dioxide, oxygen, hydrogen

sulphide, hexane and carbon monoxide content of the gas sample. It also has internal sensors for the

measurement of gas pressures (or vacuum) and flow. External sensors can be attached for the

measurement of temperature and gas velocity.

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