Crowcon detective plus
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Crowcon Detective Plus Transportable Area Monitor

  • Area monitor for up to four gas types simultaneously
  • Single or multi-unit operation
  • PC Interface

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The Crowcon Detective Plus will be discontinued and no longer available to purchase from 28th November 2025. The replacement is the DetectiveIQ.

The Crowcon Detective Plus is an area monitor for Combustible, Oxygen and Toxic gas detection. Rapidly deployable in industrial and remote gas detection applications. Suitable for continuous area monitoring, with the added versatility of being easily moved to another location if required.

A single unit can be used for small area monitoring while personnel are working. To protect larger areas, up to 12 Detectives can be linked together to provide a perimeter defence.

Designed for operation in harsh environments, this impact-resistant detector features a rugged tripod design that will continue to function even if overturned.

The Detective’s main body is constructed from fire-retardant, high-impact, UV-stabilised ABS plastic. The unit features a highly visible display with a high-contrast LCD and a backlight with two lines of 24 characters.

The standard monitoring time is 36 hours with the 7.2Ah battery; it can be extended to 60 hours with the 12Ah battery pack. Note: Charging should be done only in safe areas.

The sensors are located on the underside of the unit for protection. A manual aspirator can be attached for spot sampling. The instrument may be configured to detect any practical combination of oxygen, toxic, and flammable gases using electrochemical, catalytic, and thermal conductivity sensors.

Infrared, long-lasting poison-immune sensors for Flammable or Carbon Dioxide gases can also be fitted. An automatic sampling pump option is available.

Audible is a wailing, omnidirectional siren, 104 dBA at 1 metre. Used widely in Oil, Gas, Petrochemical and General Industry. Three high-intensity red light beacons indicate hazardous gas levels at the top of the unit, and a high-volume audible sounder on the underside of the unit.

A slow-flashing green LED indicates normal operation, and a fast-flashing green LED indicates a low battery. Visual LED clusters flash rapidly with linked detectives duplicating the alarm, but at a slower rate so the Detective closest to the hazard can be pinpointed.

Features

  • Approvals ATEX, CSA & IECEx.
  • Water and dust ingress to IP65.
  • Datalogging adjustable sample rate, 100 hours at 1 minute, maximum 6000 data points per channel, for downloading to a computer.
  • Multi-unit operation – Interconnecting leads – 10 m standard; options for longer lengths up to 100 m.
  • Folding or fixed leg options provide easy storage and transportation.
  • Supplied with a tool kit, calibration flow plate and tubing.
  • Size:  H 64 x W 45.5 x D 45.5cm (25.2 x 17.9 x 17.9 inches). Weight 7.5 kg (19lb).
  • Country of Origin: United Kingdom. Commodity Code: 90268020.

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    Title Size
    Detective-Plus Datasheet 305 KB
    Detective-User-Manual 516 KB
    Detective-IR-User-Manual 679 KB
    Notice-of-Obsolescence-Detective 234 KB

    Additional information

    Weight 0.09 kg

    Ordering Information

    Detective Net
    C01360-1 Detective NET 433MHz (with 0.7M of cable)
    Detective Plus Non-pumped
    DP-AAAGCNCS-D001-A 4 gas – CH4 % LEL, O2, H2S, CO (H2 filtered)non-pumped, standard battery with rigid legs English ATEX (was DSU-01-EA-R)
    DP-AAAGCNCS-F001-A 4 gas – CH4 % LEL, O2, H2S, CO (H2 filtered) non-pumped, extended battery with rigid legs English ATEX (was DEU-01-EA-R)
    DP-AAAGCNCS-D001-C 4 gas – CH4 % LEL, O2, H2S, CO (H2 filtered), non-pumped, standard battery with folding legs English ATEX
    DP-AAAGCNCS-F001-C 4 gas – CH4 % LEL, O2, H2S, CO (H2 filtered), non-pumped, extended battery with folding legs English ATEX
    DP-AACNCSAG-E002-C 4 gas – CH4 % LEL, O2, H2S, CO (H2 filtered), non-pumped, extended battery with folding legs USA UL
    DP-AACNAJCH-E002-A 4 gas – CH4 % LEL, H2S, SO2, VO non-pumped, extended battery with rigid legs USA UL
    DP-BUAGCNCS-F007-A 4 gas – PROP % LEL, O2, H2S, CO(H2 filtered) non-pumped, extended battery with rigid legs DUTCH ATEX
    DP-AAAGCNZZ-D001-A 3 gas – CH4 % LEL, O2, H2S non-pumped, standard battery with rigid legs English ATEX (was DSU-02-EA-R)
    DP-AAAGCNZZ-F001-A 3 gas – CH4 % LEL, O2, H2S non-pumped, extended battery with rigid legs English ATEX (was DEU-02-EA-R)
    DP-AAAGCNZZ-D003-A 3 gas – CH4 % LEL, O2, H2S non-pumped, standard battery with rigid legs French ATEX (was DSU-02-FA-R)
    DP-AAAGCSZZ-D001-A 3 gas – CH4 % LEL, O2, CO (H2 filtered) non-pumped, standard battery with rigid legs English ATEX (was DSU-03-EA-R)
    DP-AAAGCNCS-E002-A 4 gas – CH4 % LEL, O2, CO(H2 filtered), H2S, non-pumped, extended battery with rigid legs USA UL
    DP-AAAGZZZZ-D001-A 2 gas – CH4 % LEL, O2 non-pumped, standard battery with rigid legs English ATEX (was DSU-04-EA-R)
    DP-AACNZZZZ-D001-A 2 gas – CH4 % LEL, H2S, non-pumped, standard battery with rigid legs English ATEX
    DP-ADAGZZZZ-D001-A 2 gas – BUT % LEL, O2, non-pumped, standard battery with rigid legs English ATEX
    DP-AACNZZZZ-F001-A 2 gas – CH4 % LEL, H2S, non-pumped, extended battery with rigid legs English ATEX
    DP-AAZZZZZZ-D001-A 1 gas – CH4 % LEL non-pumped, standard battery with rigid legs English ATEX (was DSU-05-EA-R)
    DP-AAZZZZZZ-F001-A 1 gas – CH4 % LEL non-pumped, extended battery with rigid legs English ATEX (was DEU-06-EA-R)
    DP-ADZZZZZZ-D001-A 1 gas BUT % LEL, non-pumped, standard battery with rigid legs English ATEX
    DP-CNZZZZZZ-D001-C 1 gas H2S non-pumped, standard battery with folding legs English ATEX
    Detective Plus Pumped
    DP-AACNCSAG-D001-B 4 gas – CH4 % LEL, O2, H2S, CO (H2 filtered) pumped, standard battery with rigid legs English ATEX (was DSP-01-EA-R)
    DP-AAAGCNCS-F001-B 4 gas – CH4 % LEL, O2, H2S, CO (H2 filtered) pumped, extended battery with rigid legs English ATEX (was DEP-01-EA-R)
    DP-AAAGCNCS-F001-D 4 gas – CH4 % LEL, O2, H2S, CO (H2 filtered) pumped, extended battery with folding legs English ATEX
    DP-AACNAGZZ-D001-B 3 gas – CH4 % LEL, O2, H2S pumped, standard battery with rigid legs English ATEX (was DSP-02-EA-R)
    DP-AACNAJZZ-D001-D 3 gas – CH4 % LEL, H2S, S02, pumped, standard battery with folding legs English ATEX
    DP-ADCNCHZZ-F001-B 3 gas – BUT % LEL, H2S, V0, pumped, extended battery with rigid legs English ATEX
    DP-AAAGZZZZ-F001-B 2 gas – CH4 % LEL, O2 pumped, extended battery with rigid legs English ATEX (was DEP-04-EA-R)
    DP-ADCHZZZZ-F001-B 2 gas – BUT % LEL, VO, pumped, extended battery with rigid legs English ATEX
    DP-ACAGCNCS-D001-B 4 gas – PENT % LEL, O2, H2S, CO(H2 filtered) pumped, standard battery with rigid legs English ATEX
    Detective Plus IR Non-pumped
    DP-BJAGZZZZ-D019-A 2 gas – Flam IR CH4 % LEL, O2, non-pumped, standard battery with rigid legs French ATEX (was DSU-08-FA-R)
    DP-BJAGCNCS-E056-A 4 gas – Flam IR CH4 % LEL, O2, H2S, CO(H2 filtered) non-pumped, extended battery with rigid legs USA UL
    DP-BJCNCSAG-E056-B 4 gas – Flam IR CH4 % LEL, O2, H2S, CO(H2 filtered) pumped, extended battery with folding legs USA UL
    DP-BJZZZZZZ-D018-A 1 gas – Flam IR CH4 % LEL, non-pumped, standard battery with rigid legs English ATEX
    DP-BKAGZZZZ-D001-A 2 gas – Dual Range IR CH4 % LEL & % VOL, 02, non-pumped, standard battery with rigid legs English ATEX
    Detective Plus IR Pumped
    DP-BJCNCSAG-D001-B 4 gas – Flam IR CH4 0-100% LEL, O2, H2S, CO (H2 filtered) pumped, standard battery with rigid legs English ATEX (was DSP-07-EA-R)
    DP-BKAGCNZZ-D001-B 3 gas – Dual Range IR CH4 % LEL & % VOL, O2, H2S, pumped, standard battery with rigid legs English ATEX
    Detective Plus Sensor Modules
    CH4DP 0-100% LEL methane
    C3H8DP 0-100% LEL propane
    C5H12DP 0-100% LEL pentane
    C4H10DP 0-100% LEL butane
    C2H4DP 0-100% LEL ethylene
    H2DP 0-100% LEL hydrogen
    FLAMDPUSA 0-100% LEL flammable gas (USA alarms UL approval specify calibration)
    FLAMDPAUS 0-100% LEL flammable gas (AUS alarms specify calibration)
    CH4DPDRLEL 0-100% LEL methane for dual range % LEL/% vol. units
    CH4DPDRVOL 0-100% vol. methane for dual range % LEL/% vol. units
    O2DP 0-25% oxygen – 2 year sensor
    H2SDP 0-50ppm hydrogen sulphide
    H2SDPUSA 0-50ppm hydrogen sulphide (US Alarms, UL approval)
    H2SDPAUS 0-50ppm hydrogen sulphide (AUS alarms)
    S02DP 0-10ppm sulphur dioxide (hydrogen sulphide immune)
    H2DPPPM 0-2000ppm hydrogen
    NODP 0-100ppm nitric oxide
    NO2DP 0-10ppm nitrogen dioxide*
    CL2DPUK 0-5ppm chlorine* (UK alarm levels)
    CL2DP 0-5ppm chlorine*
    HCLDP 0-10ppm hydrogen chloride*/**
    HCNDP 0-25ppm hydrogen cyanide
    NH3DP 0-50ppm ammonia
    NH3DP1000 0-1000ppm ammonia
    CLO2DP 0-1ppm chlorine dioxide*
    PH3DPUK 0-2ppm phosphine* UK alarm levels
    H2SDP1000 0-1000ppm hydrogen sulphide
    PH3DP 0-2ppm phosphine*
    ASH3DP 0-1ppm arsine
    VODP 0-100ppm volatile organics**
    ETODP 0-10ppm ethylene oxide**
    HFDP 0-10ppm hydrogen fluoride*
    F2DP 0-10ppm fluorine*
    H2DPEC 0-4% hydrogen electrochemical
    Detective Plus IR Sensor Modules
    CH4DPIRUL 0-100% LEL methane IR (UL)
    CH4DPIRATEX 0-100% LEL methane IR (ATEX)
    CH4DPDRIRUL Dual range 0-100% LEL and 0-100% vol. methane IR (UL)
    CH4DPDRIRATEX Dual range 0-100% LEL and 0-100% vol. methane IR (ATEX)
    C3H8DPIR 0-100% LEL propane
    C3H8DPDRIR Dual range 0-100% LEL and 0-100% vol. propane IR
    C4H10DPIR 0-100% LEL butane IR
    C4H10DPDRIR Dual range 0-100% LEL and 0-100% vol. butane IR
    C2H4DPIR 0-100% LEL ethylene IR
    C2H4DPDRIR Dual range 0-100% LEL and 0-100% vol. ethylene IR
    CO2DPIR 0-5% vol. carbon dioxide
    Detective Plus Accessories
    C01325 Baffle plate to protect sensor apertures
    C011033 Detective plus water trap
    E07394 Computer lead assembly
    E070010 Inter-connecting lead, 10m (M to M connection)
    E070011 Inter-connecting lead, 20m (F to M connection)
    E070012 Inter-connecting lead, 20m (M to M connection)
    E070028 0.7m cable for Detective net wireless
    C02097 USB to RS232 adaptor
    C03464 EU charging lead
    C03465 US charging lead
    C03466 UK charging lead
    Detective Plus Spare Sensor Modules
    S011375/AA 0-100% LEL methane
    S011375/AB 0-100% LEL propane
    S011375/AC 0-100% LEL pentane
    S011375/AD 0-100% LEL butane
    S011375/AE 0-100% LEL ethylene
    S011375/AF 0-100% LEL hydrogen
    S011375/USA 0-100% LEL flammable gas USA alarms UL approval (specify calibration)
    S011375/KDF 0-100% LEL flammable gas AUS alarms (specify calibration)
    S011957 0-100% LEL methane for dual range % LEL/% vol. units
    S01423 0-100% vol. methane for dual range % LEL/% vol. units
    S013072 0-10% vol. Hydrogen single or for dual range (with S011375/AF)
    S011371 0-25% oxygen – 2 year sensor
    S01240 0-50ppm hydrogen sulphide
    S01240/USA 0-50ppm hydrogen sulphide (US Alarms, UL approval)
    S01240/KDF 0-50ppm hydrogen sulphide (AUS alarms)
    S011219 0-10ppm sulphur dioxide (hydrogen sulphide immune)
    S01250 0-2000ppm hydrogen
    S011363 0-100ppm nitric oxide
    S01244 0-10ppm nitrogen dioxide*
    S012040 0-5ppm chlorine* (UK alarm levels)
    S01829 0-5ppm chlorine*
    S011369 0-10ppm hydrogen chloride*/**
    S01725 0-25ppm hydrogen cyanide
    S01726 0-50ppm ammonia
    S011848 0-1000ppm ammonia
    S01871 0-1ppm chlorine dioxide*
    S012042 0-2ppm phosphine* (UK alarm levels)
    S011045 0-1000ppm hydrogen sulphide
    S01252 0-2ppm phosphine*
    S011992 0-1ppm arsine
    S011367 0-100ppm volatile organics**
    S011366 0-10ppm ethylene oxide**
    S01832 0-10ppm hydrogen fluoride*
    S011966 0-10ppm fluorine*
    S011971 0-4% hydrogen electrochemical
    S011474 Screw fixing kit
    Detective Plus IR Spare Sensor Modules
    S011316/U 0-100% LEL methane IR (UL)
    S011316/A 0-100% LEL methane IR (ATEX)
    S011317/U Dual range 0-100% LEL and 0-100% vol. methane IR (UL)
    S011317/A Dual range 0-100% LEL and 0-100% vol. methane IR (ATEX)
    S011318 0-100% LEL propane
    S011319 Dual range 0-100% LEL and 0-100% vol. propane IR
    S011320 0-100% LEL butane IR
    S011321 Dual range 0-100% LEL and 0-100% vol. butane IR
    S011322 0-100% LEL ethylene IR
    S011323 Dual range 0-100% LEL and 0-100% vol. ethylene IR
    S011389 0-5% vol. carbon dioxide
    Detective Plus Spares
    C011050 Calibration adaptor
    C011051/X Tool kit
    C03630 Detective Net internal battery spare
    E01468 Detective membrane switch
    E01718 Membrane switch/label, Detective Plus
    E01924 Membrane switch/label, Detective Plus IR
    E01992 E2S Sounder (red)
    E04169 Detective+ Red LED with bezel
    E04170 Detective+ Green LED with bezel
    E07064 Display PCB loom
    E07065 LED loom
    E07390 Charging lead (no plug) for Detective
    E07391 Charging socket
    E07972 Lamp connection lead*
    M01441 Pipe adaptor (trained service centers only)
    M01512 Flow adaptor recess strip
    M01540 Charger socket cover
    M01893 Main PCB chassis
    M03334 Grub screw for charger socket cover (minimum order quantity 10)
    M03336 Lamp cover retaining bolts (minimum order quantity 10)
    M03405 Retaining strap fastener (minimum order quantity 10)
    M03624 M8 lock nut (minimum order quantity 10)
    M03723 Case retaining bolt
    M03800 Flow adaptor recess strip screw
    M041129 New case gasket, improved sealing compared to tape
    M04114 Inner gasket tape (per meter)
    M04289 Lamp cover
    M04315 Lamp cover retainer
    M04329 Top gasket sealing strip (per meter)
    M04383 Gasket for charger socket cover (minimum order quantity 10)
    M04398 Retaining strap for socket covers (minimum order quantity 10)
    M04596 Lamp cover seal (16mm rubber bung)
    M04905 Case upper
    M04906 Case lower
    M04907 Lamp cover
    M04956 Lamp cover bolt washer (minimum order quantity 10)
    M04961 Moulded socket cover (interconnect and computer sockets)
    M04991 Banshee sounder muting cover
    M04992 E2S sounder muting cover
    M05154 Detective Plus label set (replacement only – serial number must be given at time of order)
    M05478 Top label protective film (minimum order quantity 4)
    M05493 Detective Plus charger interface label
    S011392/D Display PCB ATEX Dutch
    S011392/E Display PCB ATEX English
    S011392/F Display PCB ATEX French
    S011951 Battery pack 7.2Ahr 36 hour
    S011969 Pump assembly. Does not include flow plate.
    S011981 Detective Plus float chamber assembly
    S011988 36hr battery conversion kit. Required to install a 36hr battery in a 60hr Detective Plus
    S011989 Battery pack 12Ahr 60 hour
    S011990 60hr battery conversion kit. Required to install a 60hr battery in a 36hr Detective Plus
    S011997 DTV+ lower case assembly repair kit
    S011998 DTV+upper case assembly repair kit
    S012000/2 LED cluster (single)*
    S012078 Detective Plus interface socket
    S012079 Detective Plus computer socket
    S01266 Sensor blanking plug kit
    S01326/3 Main PCB
    Rigid Frame Units
    M04013 Detective Plus metal frame assembly (includes legs, handle and plate)
    M01755 Detective Frame Support Plate
    M04381 Saddle washer (minimum order quantity 10)
    M03670 Button head bolt, M6 x 30 (minimum order quantity 10)
    M03437 Washer (minimum order quantity 10)
    M03442 M6 shakeproof washer (inlet/outlet) (minimum order quantity 10)
    M04387 Tube end round (minimum order quantity 10)
    Folding Frame Units
    S011970 Leg assembly
    M03670 Leg hinge bolt (minimum order quantity 10)
    M04901 Frame support bracket
    M01890 Handle
    M04904 Handle grip
    M04902 Top retainer
    M03801 Top retainer fixing screw (minimum order quantity 10)
    M03415 Screw M6 x 3/8 Pozi pan self tapper (minimum order quantity 10)
    Fuses
    E01066 Fuse 62MA I.S. encapsulated
    DE0104 Fuse 100MA encapsulated
    E01120 Fuse 250MA encapsulated
    E01118 Fuse 375MA encapsulated

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