Lower Explosive Limit (LEL) Detectors

We supply a wide range of fixed and portable LEL gas detectors engineered for industrial safety. Fixed detection systems provide continuous monitoring in hazardous areas such as refineries, chemical plants, storage facilities, and confined spaces. Portable detectors give workers the ability to check environments during maintenance, shutdowns, or emergency response.

Our LEL detectors are available from Crowcon, Dräger, GMI, Honeywell, RAE Systems, and Riken Keiki — brands trusted worldwide for flammable gas monitoring.

Ensure safe working conditions and regulatory compliance with robust LEL gas detection solutions designed to prevent explosive incidents.

LEL detection is typically achieved using catalytic bead (pellistor) sensors or infrared (IR) technology, delivering fast and reliable readings across %LEL ranges. Many devices also integrate with alarm systems, control panels, and ventilation to prevent explosive atmospheres from forming.

The Lower Explosive Limit (LEL) represents the lowest concentration of a flammable gas or vapour in air that can ignite if exposed to a source of ignition. Monitoring gas levels relative to the LEL is critical in industries where fuels, solvents, or hydrocarbons are present. Without effective detection, vapours may accumulate to explosive concentrations, posing serious risks to personnel, assets, and operations.

DETECTOR TYPE

Fixed Portable

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ION Science GasClam 2
ION Science GasClam From £150.00 p/week

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Honeywell BW RigRat

Area Monitors

From £150.00 p/week

Honeywell BW RigRat is a transportable multi-gas area monitor for hazardous industrial zones, combining wireless safety perimeters with long-runtime operation.

ENQUIRE / HIRE

Riken Keiki GX-3R

From £475.00

Riken Keiki GX-3R is an ultra-compact, intrinsically safe 4-gas personal detector for confined spaces and hazardous industrial areas. The Riken

BUY / HIRE

Riken Keiki GX-3R Pro

Portable Multi Gas Detectors, Confined Space / 4 Gas Monitors, Multi Gas Detectors

From £1,050.00

Riken Keiki GX-3R Pro is an ultra-compact 5-gas personal monitor for hazardous confined spaces, combining advanced sensing with smart connectivity.

BUY / HIRE

Honeywell BW Flex

Multi Gas Detectors, Portable Multi Gas Detectors

From £641.00

Honeywell BW Flex is a rugged, ATEX-approved portable multi-gas detector for up to four gases with predictive, connected sensing. Honeywell

BUY

Crowcon Detective +

Area Monitors

From £2,697.00

Crowcon Detective + is a transportable, multi-gas area monitor for hazardous industrial sites, combining 360° visibility with flexible networking. Crowcon

BUY / HIRE

Drager X-am 2800

Confined Space / 4 Gas Monitors

From £500.00

The Dräger X-am 2800 multi-gas detector measures up to four gases and is equipped with a particularly shock-resistant CatEx sensor.

BUY

RAE Systems MultiRAE Pro

Multi Gas Detectors, Portable Multi Gas Detectors

From £4,282.00

RAE Systems MultiRAE Pro is a wireless portable multi-threat detector for gases and gamma radiation in hazardous, mission-critical environments. RAE

BUY

RAE Systems MicroRAE

Confined Space / 4 Gas Monitors

From £571.00

RAE Systems MicroRAE is a wireless four-gas personal monitor for hazardous industrial areas, delivering connected visibility and lone-worker protection. RAE

BUY / HIRE

Crowcon T4x

Confined Space / 4 Gas Monitors

From £425.00

Crowcon T4x is a Zone 0 personal multi-gas detector for CO, H2S, O2 and flammable gases with poisoning‑resistant MPS™ sensing.

BUY

RAE Systems ToxiRAE Pro LEL

Portable Single Gas Detectors, Single Gas Detectors

From £510.00

RAE Systems ToxiRAE Pro LEL is a personal %LEL monitor for Zone 0 areas, adding wireless visibility and man-down protection.

BUY / HIRE

Honeywell BW MicroClip X3

Confined Space / 4 Gas Monitors

£595.00

Honeywell BW MicroClip X3 is a compact four-gas personal detector for harsh industrial and confined-space environments with extended operating life.

BUY

GMI Gasurveyor 500 Series

Leak Detectors, Portable Leak Detectors

From £1,650.00

The GMI Gasurveyor 500 Series is the most flexible range of gas detectors available today. By simple selection of hardware

BUY / HIRE

Base Product

Unit is supplied with a charger and power supply when purchased.

PPM Gasurveyor 500 (42500) - £3,375.00
Search, PPM, LEL, Volume (Alkaline).
PPM Gasurveyor 500R (42500R) - £3,520.00
Search, PPM, LEL, Volume (Rechargeable).
Oxygas 500 (42501X) - £2,465.00
LEL, Volume, O₂ (Alkaline).
Oxygas 500R (42501XR) - £2,615.00
LEL, Volume, O₂ (Rechargeable).
Oxygas P 500 (42501P) - £2,740.00
PPM, LEL, Volume, O₂ (Alkaline).
Oxygas P 500R (42501PR) - £2,885.00
PPM, LEL, Volume, O₂ (Rechargeable).
Gasurveyor 3 - 500 (42503) - £1,825.00
LEL, Volume (Alkaline).
Gasurveyor 3 - 500 R (42503R) - £1,975.00
LEL, Volume (Rechargeable).
Gasurveyor 3 - 500L (42503L) - £1,825.00
LEL, Volume (No Purge Mode, Alkaline).
Gasurveyor 3 - 500 LR (42503LR) - £1,975.00
LEL, Volume (No Purge Mode, Rechargeable).
Gasurveyor 6 - 500 (42506) - £2,545.00
LEL, Volume, CO (Alkaline).
Gasurveyor 6 - 500 R (42506R) - £2,695.00
LEL, Volume, CO (Rechargeable).
Gasurveyor 6B - 500 (42506B) - £2,865.00
PPM, LEL, Volume, CO (Alkaline).
Gasurveyor 6B - 500 R (42506BR) - £3,010.00
PPM, LEL, Volume, CO (Rechargeable).
Gasurveyor 11 - 500 (42501) - £2,420.00
LEL, Volume, O₂ (CGI / CSM) (Alkaline).
Gasurveyor 11 - 500 R (42501R) - £2,565.00
LEL, Volume, O₂ (CGI / CSM) (Rechargeable).
Gasurveyor 511 (44511) - £2,030.00
LEL, Volume (Alkaline).
Gasurveyor 511R (44511R) - £2,175.00
LEL, Volume (Rechargeable).
Gasurveyor 512 (44512) - £2,695.00
PPM, LEL, Volume (Alkaline).
Gasurveyor 512R (44512R) - £2,840.00
PPM, LEL, Volume (Rechargeable).
Gasurveyor 521 (44521) - £2,210.00
LEL, Volume, O₂ (Alkaline).
Gasurveyor 521R (44521R) - £2,360.00
LEL, Volume, O₂ (Rechargeable).
Gasurveyor 522 (44522) - £2,880.00
PPM, LEL, Volume, O₂ (Alkaline).
Gasurveyor 522R (44522R) - £3,025.00
PPM, LEL, Volume, O₂ (Rechargeable).
Gasurveyor 523 (44523) - £2,330.00
LEL, Volume, H₂S (Alkaline).
Gasurveyor 523R (44523R) - £2,480.00
LEL, Volume, H₂S (Rechargeable).
Gasurveyor 524 (44524) - £2,995.00
PPM, LEL, Volume, H₂S (Alkaline).
Gasurveyor 524R (44524R) - £3,145.00
PPM, LEL, Volume, H₂S (Rechargeable).
Gasurveyor 525 (44525) - £2,330.00
LEL, Volume, CO (Alkaline).
Gasurveyor 525R (44525R) - £2,480.00
LEL, Volume, CO (Rechargeable).
Gasurveyor 526 (44526) - £2,995.00
PPM, LEL, Volume, CO (Alkaline).
Gasurveyor 526R (44526R) - £3,145.00
PPM, LEL, Volume, CO (Rechargeable).
Gasurveyor 531 (44531) - £2,510.00
LEL, Volume, O₂, H₂S (Alkaline).
Gasurveyor 531R (44531R) - £2,665.00
LEL, Volume, O₂, H₂S (Rechargeable).
Gasurveyor 532 (44532) - £3,180.00
PPM, LEL, Volume, O₂, H₂S (Alkaline).
Gasurveyor 532R (44532R) - £3,325.00
PPM, LEL, Volume, O₂, H₂S (Rechargeable).
Gasurveyor 533 (44533) - £2,510.00
LEL, Volume, O₂, CO (Alkaline).
Gasurveyor 533R (44533R) - £2,665.00
LEL, Volume, O₂, CO (Rechargeable).
Gasurveyor 534 (44534) - £3,180.00
PPM, LEL, Volume, O₂, CO (Alkaline).
Gasurveyor 534R (44534R) - £3,325.00
PPM, LEL, Volume, O₂, CO (Rechargeable).
Gasurveyor 536 (44536) - £3,330.00
PPM, LEL, Volume, CO, H₂S (Alkaline).
Gasurveyor 536R (44536R) - £3,490.00
PPM, LEL, Volume, CO, H₂S (Rechargeable).
Gasurveyor 541 (44541) - £2,815.00
LEL, Volume, O₂, CO, H₂S (Alkaline).
Gasurveyor 541R (44541R) - £2,965.00
LEL, Volume, O₂, CO, H₂S (Rechargeable).
Gasurveyor 542 (44542) - £3,480.00
PPM, LEL, Volume, O₂, CO, H₂S (Alkaline).
Gasurveyor 542R (44542R) - £3,630.00
PPM, LEL, Volume, O₂, CO, H₂S (Rechargeable).

Power & Charging

Standard Charger (13844) - £190.00
Including universal power supply.
Standard Charger (13179) - £158.00
Without power supply.
GS500 Desktop Charger (14815) - £647.00
Including universal 12V power supply.
Universal Power Supply (12444) - £56.00
For standard and desktop chargers.
GS500 In-Vehicle Charger (14810) - £647.00
Including cigarette lighter plug and mounting bracket.
Car Charger 12V Lead (12988) - £23.47
For standard charger only.
5-Way Lead for Multi-Charging (13163) - £18.63
For standard charger only.
Flatbed Charger Strap (42110) - £10.80
Rechargeable Battery Pack (42114) - £260.00

Accessories

Bellows (Cup Probe) (13563) - £59.00
For PPM Gasurveyor.
Swan Neck Probe (13655) - £78.00
For PPM Gasurveyor, complete with shroud and skids.
Hex Driver for Base Screws (12451) - £9.52
30 mm Harness Assy (12370) - £21.16
User Handbook (42142) - £10.26
Cotton Filters (Box of 10) (10077) - £10.33
Standard Probe Handle (12481) - £45.12
Complete with filters.
35cm Plastic Probe Solid End (12480) - £43.15
General leak detection.
Sample Line Adaptor (12688) - £8.77
Clear Sample Line (per metre) (12712) - £10.86
Hex Driver for Base Screws (12451) - £9.52
Carrying Harness (12370) - £21.16
Carrying Case (13405) - £81.00
Hydrophobic Filter (12358) - £19.60
User Handbook (42621) - £10.26
Standard Carrying Case (13405) - £81.00
Gas Survey Carrying Case (12580) - £290.00
Standard Accessory Pack (42141) - £139.00
Includes standard carrying case, standard probe handle with filters, cotton filters (10) 35cm probe open end.
Gas Survey Accessory Pack (42151) - £604.00
Includes gas survey carry case, cotton filters (10), extended PPM probe handle, PPM probe filter and tubing, probe adapter (mid) PPM, Bellows survey probe (B), swan neck probe with shroud, and filter folder with filters.
35 cm Probe Open End (13427) - £40.99
Extended PPM Probe Handle Assembly (42764) - £67.00
PPM Probe Filter & Tubing Assembly (42765) - £69.00
Probe Adaptor (Mid) PPM (42648) - £81.00
Bellows Survey Probe (B) (13653) - £59.00
Swan Neck Probe (13655) - £78.00
Complete with shroud.
Filter Holder (42605) - £45.12
Complete with filters.
Filter Housing Sealing Washer (42235) - £0.83
For use with 42183 / 42184.
Probe Sealing Washer (12379) - £0.58
For use with 42183 / 42184 / 42605.
Water Filter (12358) - £19.60
For use with 42183 / 42605.
Dust Filter (75096) - £2.71
For use with 42184.
Probe Handle (12395) - £50.10
Complete with sample line & filters.
Probe Handle (13395) - £90.00
Complete with sample line, filters & inlet connector.
80cm Plastic Probe - Solid End (12393) - £45.45
General survey.
70cm Plastic Probe - Solid End (12895) - £36.10
General survey.
70cm Plastic Probe - Open End (12894) - £33.44
General survey.
28cm Flexible Plastic Probe - Barbed End (12394) - £14.73
Leak tracing.
35cm Plastic Probe - Solid End (12480) - £43.15
General leak detection.
35cm Plastic Probe - Open End (13427) - £40.99
General leak detection.
35cm Stainless Steel Probe - Open End (13413) - £59.00
High temperature applications.
35cm Stainless Steel Probe - Solid End (67185) - £59.00
High temperature applications.
35cm Stainless Steel Probe - Solid End (Filtered) (61779) - £105.00
High temperature applications.
80cm Stainless Steel Probe - Solid End (12229) - £104.00
High temperature applications.
50cm Stainless Steel Probe - Open End (12287) - £77.00
High temperature applications.
40cm Flexible Sampling Probe - Open End (42399) - £67.00
Restricted access surveying.
Stainless Steel Purge Probe (42449) - £80.00
For brief flue checks, use charcoal filter 13937 or 67142 & 67148.
Inline Hydrophobic Filter Holder (13656) - £53.00
Stainless Steel Purge Probe (42450) - £136.00
Includes 1.5m tubing.
40cm Flexible Sampling Probe Assembly (42400) - £110.00
Extended Survey Probe Assembly (Bellows Cup) (42700) - £271.00
Extended Survey Probe Assembly (Swan Neck) (42800) - £296.00
Carpet Probe (Trolley) (13535) - £922.00
Extenda Probe 1.7m (Overhead Pipelines) (13301) - £62.00
30ft Extendable Probe (Overhead Inspection) (49350) - £734.00
Carry Pouch (42137) - £42.41
For probes up to 80cm.
Clear Sample Line (Per Metre) (12712) - £10.86
Black Sample Line Conductive (Per Metre) (13784) - £14.73
Clear Sample Line 20m (43720) - £204.00
15m + 5m with connector.
Clear Sample Line 25m (43725) - £237.00
15m + 10m with connector.
Clear Sample Line 30m (43730) - £267.00
15m + 15m with connector.
Extender for Sample Line (42448) - £2.40
Hydrophobic Filter (12358) - £19.60
Hydrophobic Filter (Pack of 50) (12361) - £840.00
Cotton Filters (Pack of 200) (12001) - £104.00
Charcoal Filters (Pack of 5) (13937) - £323.00
Water Trap Filter (13503) - £58.00
End Cap for Filter (10336) - £0.60
Required for 13503.
Balston Disposable Filter (800027) - £20.79
Coalescing Filter Assembly (42215) - £102.00
Filter (for 42215) (75174) - £39.43
30mm Waist Belt Assembly (12371) - £18.09
Water Trap Assembly (42445) - £59.00
Dust Filters (Pack of 20) (42388) - £42.34
15m Conductive Sample Line (13774) - £201.00
Comes with sampling connector & filters. Conforms to SOLAS regulations & ISGOTT recommendations.
20m Conductive Sample Line (13775) - £374.00
Comes with sampling connector & filters. Conforms to SOLAS regulations & ISGOTT recommendations.
35m Conductive Sample Line (13779) - £396.00
Comes with sampling connector & filters. Conforms to SOLAS regulations & ISGOTT recommendations.
Sampling Connector (13776) - £75.00
Connects instrument harness to 15, 20, 35m sample line.
Filter Probe Assembly (13777) - £89.00
Sampling connector, 1m conductive tubing and probe.

Spares/Replacements

Pump Assembly (12630) - £208.00
To be replaced by qualified personnel only.
Cable Assembly (42073) - £115.00
From main PCB to cell block. To be replaced by qualified personnel only.
Dry Cell Battery Cover (12455) - £63.00
Main PCB Assembly (42004) - £700.00
To be replaced by qualified personnel only.
LCD (42063) - £48.76
To be replaced by qualified personnel only.
2 Button Switch (42120) - £94.00
To be replaced by qualified personnel only.
4 Button Switch (42042) - £111.00
To be replaced by qualified personnel only.
First Responder (42284) - £200.00
Model & serial number required. To be replaced by qualified personnel only.
Leaksurveyor (42364) - £200.00
Model & serial number required. To be replaced by qualified personnel only.
Oxygas (42824) - £200.00
Model & serial number required. To be replaced by qualified personnel only.
All Other Gasurveyor 500’s (42102) - £200.00
Model & serial number required. To be replaced by qualified personnel only.
Battery Block Assembly, Rechargeable (42033) - £105.00
To be replaced by qualified personnel only.
Battery Block Assembly, Dry Cell (42032) - £97.00
To be replaced by qualified personnel only.
M4 Hexnut for Switch (24042) - £0.27
To be replaced by qualified personnel only.
M4 Plain Washer (24285) - £0.27
To be replaced by qualified personnel only.
O-Ring for Switch (42047) - £0.71
To be replaced by qualified personnel only.
O-Ring for Switch (75741) - £0.71
To be replaced by qualified personnel only.
Lens (12851) - £5.43
To be replaced by qualified personnel only.
Top Cover Assembly (42050) - £92.00
Must be ordered with Buzzer Assembly 42068. To be replaced by qualified personnel only.
Top Cover Cord Gasket (42019) - £2.92
To be replaced by qualified personnel only.
LCD Gasket (12031) - £2.90
Price per meter - MOQ 25m. To be replaced by qualified personnel only.
Elastomeric Connector (12018) - £5.71
To be replaced by qualified personnel only.
Buzzer Assembly (42068) - £46.68
To be replaced by qualified personnel only.
Switch Overlay (4 Button 500 Series) (42139) - £9.60
To be replaced by qualified personnel only.
Switch Overlay (Oxygas 500, P500) (42681) - £8.66
To be replaced by qualified personnel only.
Switch Overlay (PPM Gasurveyor 500) (42148) - £8.66
To be replaced by qualified personnel only.
Switch Overlay (First Responder) (42271) - £9.60
To be replaced by qualified personnel only.
Switch Overlay (Leaksurveyor) (42264) - £9.60
To be replaced by qualified personnel only.
Switch Overlay (Gasurveyor 3–500) (42246) - £9.60
To be replaced by qualified personnel only.
Switch Overlay (Gasurveyor 11–500 Purge CSM/CGI) (42651) - £9.60
To be replaced by qualified personnel only.
Case Assembly - Centre Section (42059) - £94.00
To be replaced by qualified personnel only.
Inlet Tube (42074) - £5.95
To be replaced by qualified personnel only.
Inlet Nozzle (12037) - £18.17
To be replaced by qualified personnel only.
Inlet Nozzle O-Ring (12006) - £0.71
To be replaced by qualified personnel only.
Inlet Tube O-Ring (12038) - £0.71
To be replaced by qualified personnel only.
Retaining Clip (12039) - £1.04
To be replaced by qualified personnel only.
Main Cable Assembly (42072) - £45.49
Units without toxic cells block, combustion chamber only. To be replaced by qualified personnel only.
Outlet Nozzle (42017) - £6.95
To be replaced by qualified personnel only.
Outlet Nozzle O-Ring (12035) - £0.35
To be replaced by qualified personnel only.
500mA Fuse (12790) - £10.63
To be replaced by qualified personnel only.
Inlet Pipe (12505) - £12.76
To be replaced by qualified personnel only.
Cell Housing Assembly (42060) - £78.00
To be replaced by qualified personnel only.
O-Ring Toxic (12423) - £0.27
To be replaced by qualified personnel only.
O-Ring Oxygen (76038) - £0.24
To be replaced by qualified personnel only.
PCB Assembly for Cell Block (42003) - £84.00
To be replaced by qualified personnel only.
M2.2x6 Screw (PCB) (24769) - £0.26
To be replaced by qualified personnel only.
Cell Block Lid (42030) - £8.94
To be replaced by qualified personnel only.
M3x3 Screw for Cell Block Lid (24613) - £0.56
To be replaced by qualified personnel only.
M3 Washer for Cell Block Lid (24276) - £0.27
To be replaced by qualified personnel only.
O2 Blanking Plug (42084) - £6.59
To be replaced by qualified personnel only.
CO/H₂S Blanking Plug (42083) - £115.00
To be replaced by qualified personnel only.

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