Crowcon T4
Crowcon Tetra 4

Crowcon T4-Tetra 4 Multi Gas Detector

Code: Tetra 4
  • Up to Four Gases
  • Robust
  • Easy Operation

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Crowcon T4-Tetra 4 is a portable detector with up to four gas capability.  Flammable gas, oxygen depletion, carbon monoxide and hydrogen sulphide can all be monitored simultaneously. Three or two gas models are also available.  The flammable sensor targeting methane has now enhanced sensitivity for pentane, hexane and other long-chain hydrocarbons.

A unique T4 feature is the TWA resume button, where the long term exposure limit of a worker is calculated over eight hours. With other detectors switching off and on again assumes the start of a new shift, potentially underestimating exposure. By pressing the resume button the detector will continue to calculate the time weight average over the entire eight hour shift period, inclusive of time before switch off. Battery life is 18 hours enabling multiple shifts or extended shifts without the need for recharging.

Designed to be tough, drop-tested on concrete to 4 metres. Operation is by a single button, use is possible wearing gloves and an intuitive menu system makes the T4 simple to use.  Visual monitor status is indicated to all by LEDs. Green indicates working correctly and red/blue for alarm or action needed. T4 also includes a 95dB audible and vibrating alarms permitting use in noisy environments.

Measuring ranges

Oxygen (O2): 0-30% vol, resolution 0.1% vol
Flammable 0-100% LEL, resolution 1% LEL
Hydrogen Sulphide (H2S) 0-100ppm, resolution 1ppm
Carbon Monoxide (CO) 0-1000ppm, resolution 1ppm

Features

  • Suitable for harsh environments
  • Optional clip-on filter cover protects sensors from dirt
  • Rubber shockproof casing
  • Ingress IP65 Dust/water jets and IP67 withstanding short term water immersion
  • Dedicated sensors for each gas – no dual tox
  • Backlight display, view can be rotated 180° according to preference
  • Data logging 130 hours based on 10-second intervals. Events 3500
  • Warranty two years upgradeable to three
  • Approvals: ATEX, IECEx and UL
  • Size:135 x 80 x 35mm (5.3 x 3.1 x 1.4in). Weight 282g (9.9oz)

T4 supplied with; Rubber boot, alligator clip for donning, quick start guide, bump/calibration cap, calibration certificate and declaration of conformity. None kit versions require a charger – purchase separately. Norrscope stocks standard four gas configurations for fast delivery.

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Title Size
Tetra T4-datasheet 240 KB
Tetra T4_Manual 3 MB

Additional information

Weight0.190 kg
Gas Type

Multi Gas

Ordering Information

T4 Main Unit 
Product CodeDescription
Standard Configuration
T4-HOCA4 gas – H2S, O2, CO,CH4 % LEL
T4-ZOCA3 gas – O2, CO,CH4 % LEL
T4-HOZA3 gas – H2S, O2, CH4 % LEL
T4-ZOZA2 gas – O2,CH4 % LEL
T4-ZOCZ2 gas – O2,CO
T4-HOCA-H24 gas – H2S, O2, CO (H2 resistant),CH4 % LEL
T4-ZOCA-H23 gas – O2, CO (H2 resistant),CH4 % LEL
Order charger separately
T4-EW3Extend warranty to 3 years. Includes sensors & battery. Add this code as a second line on the order.
Alternate alarm levels / certifications
T4-HOCA-XX4 gas – H2S, O2, CO,CH4 % LEL
T4-ZOCA-XX3 gas – O2, CO,CH4 % LEL
T4-HOZA-XX3 gas – H2S, O2, CH4 % LEL
T4-ZOZA-XX2 gas – O2,CH4 % LEL
T4-ZOCZ-XX2 gas – O2,CO
T4-HOCA-H2-XX4 gas – H2S, O2, CO (H2 resistant),CH4 % LEL
T4-ZOCA-H2-XX3 gas – O2, CO (H2 resistant),CH4 % LEL
T4-EW3Extend warranty to 3 years. Includes sensors & battery. Add this code as a second line on the order.
Including cradle charger
T4-HOCA-XX-CRD4 gas – H2S, O2, CO,CH4 % LEL
T4-ZOCA-XX-CRD3 gas – O2, CO,CH4 % LEL
T4-HOZA-XX-CRD3 gas – H2S, O2, CH4 % LEL
T4-ZOZA-XX-CRD2 gas – O2,CH4 % LEL
T4-ZOCZ-XX-CRD2 gas – O2,CO
T4-HOCA-H2-XX-CRD4 gas – H2S, O2, CO (H2 resistant),CH4 % LEL
T4-ZOCA-H2-XX-CRD3 gas – O2, CO (H2 resistant),CH4 % LEL
T4-EW3Extend warranty to 3 years. Includes sensors & battery. Add this code as a second line on the order.
Where XX is region/approval (See above) ATEX, IECEx, UL
Region/ ApprovalApproval 
(standard)O2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
S2O2: 19.0/23.5%, CH4: 10/20%, CO: 30/100 ppm, H2S: 5/10 ppm
DEO2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
ESO2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
FRO2: 19.0/23%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
ITO2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
NLO2: 19.0/23.5%, CH4: 10/40%, CO: 25/50 ppm, H2S: 1.6/5 ppm
PLO2: 19.0/23%, CH4: 20/40%, CO: 20/100 ppm, H2S: 5/10 ppm
SGO2: 19.5/23.5%, CH4: 10/40%, CO: 25/100 ppm, H2S: 10/15 ppm
USO2: 19.5/23.5%, CH4: 10/20%, CO: 35/50 ppm, H2S: 10/15 ppm
BR (INMETRO)O2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
T4 bundles 
Product CodeDescription
T4-HOCA-1010 x 4 gas – H2S, O2, CO,CH4 % LEL
Includes 10 way charger
T4-ZOCA-1010 x 3 gas – O2, CO,CH4 % LEL
Includes 10 way charger
T4-HOZA-1010 x 3 gas – H2S, O2, CH4 % LEL
Includes 10 way charger
T4-ZOZA-1010 x 2 gas – O2,CH4 % LEL
Includes 10 way charger
T4-HOCA-H2-1010 x 4 gas – H2S, O2, CO (H2 Resistant),CH4 % LEL
Includes 10 way charger
T4-ZOCA-H2-1010 x 3 gas – O2, CO (H2 Resistant),CH4 % LEL
Includes 10 way charger
T4 Chargers 
T4 main unit does not include a charger
Product CodeDescription
T4-CRDT4 Cradle charger and multi region power supply
T4-TWCT4 10 way charger and multi region power supply – available only for ATEX/IECEX regions
Includes Europe, UK
T4-VHLT4 vehicle charger and vehicle charging adaptor
Inmetro certified
T4-VHL-BRT4 vehicle charger – Inmetro
Includes vehicle charging adaptor
T4 Accessories 
Charging & comms cables
Product CodeDescription
CH0106Vehicle charging adaptor
For use with CH0102 charging lead
CH0102Charging lead
For use with CH0106 vehicle charging adapter
CH0103USB communications lead (not powered)
CH0104USB dual communication and power lead
E011166Power supply for 10 way charger
Includes power cords for North America, Europe, UK
T4 Accessories 
Charging & comms cables – Inmetro certified
Product CodeDescription
CH0203USB communications lead (not powered) – Inmetro
CH0204USB communication and power lead – Inmetro
Sensor filter plates
T4-EXT-FT4 external filter plate
T4-EXT-F-10T4 external filter plate pack of 10
Hand aspirator
T4-ASP-KITT4 aspirator kit, 20 metre
Contains aspirator plate, hand operated bulb and 20 metre hose
T4-ASP-CAPT4 aspirator plate
AC0504Hand aspirator bulb
(Hose available separately)
C010971m sample probe
C01757Telescopic aspirator probe
M04032/XAspirator hose – per metre
when ordering replace the X with 1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 35, 40, 60, 70 or 100  for the length
T4 Accessories 
Bump / calibration accessories
Product CodeDescription
T4-CAL-CAPReplacement bump and calibration cap for T4
G4-QUAD-1-112112 Litre – 15 ppm H2S, 100ppm CO, 2.2 %vol CH4, 18% O2 in nitrogen
C03052Fixed flow regulator with on/off switch
T4 I-Test 
Product CodeDescription
IT-T4-11Z-ZB-1I-Test 1 x gas inlet and T4 Module for ATEX Regional Settings (CH4 set to 2.2%)
IT-T4-11Z-ZB-2I-Test 1 x gas inlet and T4 Module for UL Regional Settings
(CH4 set to 2.5%)
IT-T4-11Z-ZB-3I-Test 1 x gas inlet and T4 Module for Inmtero Regional Settings (CH4 set to 2.2%)
I-Test Accessories
C03332Demand flow regulator, 1-3 litre/min
AC0510Cylinder holder (wall mount) for 34L to 112L cylinders
T4 Spares
Product CodeDescription
SS01120-100% LEL (T4 Type 2)
SS05010-30% Oxygen (3 Year) (See Common Spares tab for pricing)
SS0301Carbon monoxide 0-1000 ppm (T4) 0-2000ppm or 0-500ppm (H2S & SO2 filtered) (Gas-Pro) (See Common Spares tab for pricing)
SS0302Carbon monoxide 0-1000 ppm (T4) 0-2000ppm (Gas-Pro)   (H2 filtered) (See Common Spares tab for pricing)
SS0303Hydrogen sulphide 0-100 ppm (See Common Spares tab for pricing)
M040003Sensor Blank
T4-PCB-MT4 main board
T4-PCB-ST4 sensor board & sensor insulator
T4-SCR-20T4 case screws, pack of 20
T4-LCDT4 LCD screen & shock gasket
T4-FRC-OT4 orange front case with Crowcon bubble label
T4-BKC-OCT4 orange back case with alligator clip and ATEX/IECEx/UL certification Label (Type 2)
Serial number needed with order (other wise order as T4-BKC-OC-X)
T4-BKC-OC/UT4 orange back case with alligator clip and ATEX/IECEx MED certification label (Type 2)
Serial number needed with order (other wise order as T4-BKC-OC-X/U)
T4-BKC-ODT4 orange back case with alligator clip and Inmetro certification label (Type 2)
Serial number needed with order (other wise order as T4-BKC-OD-X)
S012342T4 battery
M050091T4 Crowcon branded label
M040166T4 one piece sensor gasket
M040167T4 display gasket
T4-AGCT4 alligator clip + screw
M040168T4 sensor insulator
M05152T4 Certification label
Specify serial number on order.
M048521Adhesive flow plate gasket for I-Test (T4)

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