Crowcon Detective LEL, O2, H2S, CO (H2 filtered) Diffusion

Crowcon Detective LEL, O2, H2S, CO (H2 filtered) Diffusion


£3,776.39 inc VAT

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Crowcon Detective Plus Gas Detector

Crowcon Detective LEL, O2, H2S, CO (H2 filtered) Diffusion


£3,776.39 inc VAT

Crowcon Detective+

The Detective+ transportable area monitor is based on the highly successful Triple Plus+ and Detective models, building on the reputation, reliability and versatility of its forebears. Detective+ is inherently rugged and robust, with a sturdy fixed or folding leg protective frame options. Loud and clear alarms can be transmitted between Detective+ units while an optional built in pump allows faster gas response and better sensor protection.

Detective+ may now be equipped with infra-red sensor technology, which provides either CO2 detection, or allows higher flammable gas level monitoring and immunity to the poisoning effects which standard flammable gas sensors can suffer from.

There are now two options for battery capacity, either 36 hours or 60 hours with standard configuration, providing remote sites with extended usage in-between charges. Couple these features with the wide range of toxic gas sensors available and it makes Detective+ one of the most versatile area monitors available. 55,000 Detective and TriplePlus+ users can’t be wrong.

Key Features

  • Up to 4 gases monitored in a rugged and sturdy protective frame
  • Ultra-loud 104 dBA sounder and red LED cluster alarms
  • Wide range of sensor options including infra-red
  • Long 36 or 60 hour battery life
  • Raised detectors, coupled with IP65 specification provides excellent sensor protection
  • Built-in pump option to provide faster gas response
  • 12 Detective+ units may be linked together, up to 100m from adjacent units

Compatible Gas Types

Click here to find out what other gas detectors, spares & accessories we have to offer; also check out our handy blog article on The Origin of Portable Gas Detectors.



Size640 x 455 x 455mm (25.2 x 17.9 x 17.9ins)
Weight7.5kg (19lbs)
Visible alarmsThree large, top mounted red LED clusters and a single red LED on control panel.
Alarm mode: LED clusters flash in quick succession. LED clusters of linked Detectives repeating the alarm, flash
slower than LED lights on those Detectives sensing the hazard
Normal working: Slow flashing green LED
Battery low: Rapid flashing green LED
Audible alarmsWailing, omni-direction siren, 104 dBA at 1m
DisplayHigh contrast LCD with back light. Values and units for up to 4 gases displayed simultaneously at current, TWA or
peak levels, low battery, real time and elapsed time calibration and configuration data also displayed
BatteryStandard 6V, 7.2Ah, sealed lead acid battery pack
Optional 6V, 12Ah high capacity pack
Battery lifeUp to 36 hours with flammable/ CO2 sensor fitted with 7.2Ah battery
Up to 60 hours with optional 12Ah battery pack
Typical response timesMethane 20s, oxygen 10s, typical toxic gas 20s, IR 20s
Expected sensor lifeFlammable 5 years, toxic 3 years, oxygen 2 years minimum, IR>5 years
Operating temperature range-20OC to +50OC (-4OF to 122OF)
Humidity0-95% RH non-condensing
ApprovalsEurope: ATEX II 2G EEx ib d IIC T4
International: IECEx EEx ib d IIC T4
StandardsEN50014, EN50018, EN50020, EN50104, EN45544, IEC60079-0/-1 IEC60079-11
Ingress protectionIP65
EMCEN 50270, FCC CFR47 Part 15
PC interfaceVia RS232 lead. Portables PC software can be used to set alarms, clock, datalogging interval and password,
manages datalogging giving graphical display of instrument log file and allows to export to spreadsheet
CalibrationQuick calibration using internal menu command, Portables PC or the Crowcon CheckBox IMH management system
AccessoriesBaffle plate, interconnecting leads, RS232 communications lead
SamplingInternal electric sampling pump option, manual aspiration
Linked DetectivesUp to 12 units can be linked to provide perimeter or area monitoring

Sensor Ranges

GasRangeTypical Alarm
Flammable gas0-100 LEL20% LEL
Oxygen (O2)0-25%19% & 23%
Hydrogen sulphide (H2S)0-50ppm10ppm
Carbon monoxide (CO)0-500ppm35ppm
Sulphur dioxide (SO2)0-10ppm2ppm
Chlorine (Cl2)0-5ppm0.5ppm
Nitrogen dioxide (NO2)0-10ppm2ppm
Phosphine (PH3)0-5ppm0.5ppm
Ammonia (HN3)0-50ppm25ppm
Ammonia (NH3)0-1000ppmn/a
Hydrogen (non-flammable levels)0-2000ppmn/a
Hydrogen cyanide (HCN)0-25ppm10ppm
Hydrogen chloride (HCl)*/+0-10ppm5ppm
Chlorine dioxide (ClO2)+0-1ppm0.1ppm
Hydrogen fluoride (HF)+0-10ppm1ppm
Ethylene oxide (C2H4O)*0-10ppm5ppm
Volatile organic*/+0-100ppmn/a
Flammable gas0-100% LEL20% LEL
Flammable gas0-100% v/vNone
Carbon dioxide (CO2)0 to 5% v/v0.5 and 1.5% v/v


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