Crowcon T4-Tetra 4 Multi Gas Detector | Norrscope

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 combustible sensor targeting methane has now enhanced sensitivity for pentane, hexane and other long-chain hydrocarbons.

A unique Tetra 4 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, the view can be rotated 180° according to preference
Datalogging 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.

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

Additional information

Weight	0.190 kg

Ordering Information

T4 Main Unit
Product Code	Description
Standard Configuration
T4-HOCA	4 gas – H2S, O2, CO,CH4 % LEL
T4-ZOCA	3 gas – O2, CO,CH4 % LEL
T4-HOZA	3 gas – H2S, O2, CH4 % LEL
T4-ZOZA	2 gas – O2,CH4 % LEL
T4-ZOCZ	2 gas – O2,CO
T4-HOCA-H2	4 gas – H2S, O2, CO (H2 resistant),CH4 % LEL
T4-ZOCA-H2	3 gas – O2, CO (H2 resistant),CH4 % LEL
	Order charger separately
T4-EW3	Extend warranty to 3 years. Includes sensors & battery. Add this code as a second line on the order.
Alternate alarm levels / certifications
T4-HOCA-XX	4 gas – H2S, O2, CO,CH4 % LEL
T4-ZOCA-XX	3 gas – O2, CO,CH4 % LEL
T4-HOZA-XX	3 gas – H2S, O2, CH4 % LEL
T4-ZOZA-XX	2 gas – O2,CH4 % LEL
T4-ZOCZ-XX	2 gas – O2,CO
T4-HOCA-H2-XX	4 gas – H2S, O2, CO (H2 resistant),CH4 % LEL
T4-ZOCA-H2-XX	3 gas – O2, CO (H2 resistant),CH4 % LEL
T4-EW3	Extend warranty to 3 years. Includes sensors & battery. Add this code as a second line on the order.
Including cradle charger
T4-HOCA-XX-CRD	4 gas – H2S, O2, CO,CH4 % LEL
T4-ZOCA-XX-CRD	3 gas – O2, CO,CH4 % LEL
T4-HOZA-XX-CRD	3 gas – H2S, O2, CH4 % LEL
T4-ZOZA-XX-CRD	2 gas – O2,CH4 % LEL
T4-ZOCZ-XX-CRD	2 gas – O2,CO
T4-HOCA-H2-XX-CRD	4 gas – H2S, O2, CO (H2 resistant),CH4 % LEL
T4-ZOCA-H2-XX-CRD	3 gas – O2, CO (H2 resistant),CH4 % LEL
T4-EW3	Extend 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/ Approval	Approval
(standard)	O2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
S2	O2: 19.0/23.5%, CH4: 10/20%, CO: 30/100 ppm, H2S: 5/10 ppm
DE	O2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
ES	O2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
FR	O2: 19.0/23%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
IT	O2: 19.0/23.5%, CH4: 20/40%, CO: 30/100 ppm, H2S: 5/10 ppm
NL	O2: 19.0/23.5%, CH4: 10/40%, CO: 25/50 ppm, H2S: 1.6/5 ppm
PL	O2: 19.0/23%, CH4: 20/40%, CO: 20/100 ppm, H2S: 5/10 ppm
SG	O2: 19.5/23.5%, CH4: 10/40%, CO: 25/100 ppm, H2S: 10/15 ppm
US	O2: 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 Code	Description
T4-HOCA-10	10 x 4 gas – H2S, O2, CO,CH4 % LEL Includes 10 way charger
T4-ZOCA-10	10 x 3 gas – O2, CO,CH4 % LEL Includes 10 way charger
T4-HOZA-10	10 x 3 gas – H2S, O2, CH4 % LEL Includes 10 way charger
T4-ZOZA-10	10 x 2 gas – O2,CH4 % LEL Includes 10 way charger
T4-HOCA-H2-10	10 x 4 gas – H2S, O2, CO (H2 Resistant),CH4 % LEL Includes 10 way charger
T4-ZOCA-H2-10	10 x 3 gas – O2, CO (H2 Resistant),CH4 % LEL Includes 10 way charger
T4 Chargers
T4 main unit does not include a charger
Product Code	Description
T4-CRD	T4 Cradle charger and multi region power supply
T4-TWC	T4 10 way charger and multi region power supply – available only for ATEX/IECEX regions Includes Europe, UK
T4-VHL	T4 vehicle charger and vehicle charging adaptor
Inmetro certified
T4-VHL-BR	T4 vehicle charger – Inmetro Includes vehicle charging adaptor
T4 Accessories
Charging & comms cables
Product Code	Description
CH0106	Vehicle charging adaptor For use with CH0102 charging lead
CH0102	Charging lead For use with CH0106 vehicle charging adapter
CH0103	USB communications lead (not powered)
CH0104	USB dual communication and power lead
E011166	Power supply for 10 way charger Includes power cords for North America, Europe, UK
T4 Accessories
Charging & comms cables – Inmetro certified
Product Code	Description
CH0203	USB communications lead (not powered) – Inmetro
CH0204	USB communication and power lead – Inmetro
Sensor filter plates
T4-EXT-F	T4 external filter plate
T4-EXT-F-10	T4 external filter plate pack of 10
Hand aspirator
T4-ASP-KIT	T4 aspirator kit, 20 metre Contains aspirator plate, hand operated bulb and 20 metre hose
T4-ASP-CAP	T4 aspirator plate
AC0504	Hand aspirator bulb (Hose available separately)
C01097	1m sample probe
C01757	Telescopic aspirator probe
M04032/X	Aspirator 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 Code	Description
T4-CAL-CAP	Replacement bump and calibration cap for T4
G4-QUAD-1-112	112 Litre – 15 ppm H2S, 100ppm CO, 2.2 %vol CH4, 18% O2 in nitrogen
C03052	Fixed flow regulator with on/off switch
T4 I-Test
Product Code	Description
IT-T4-11Z-ZB-1	I-Test 1 x gas inlet and T4 Module for ATEX Regional Settings (CH4 set to 2.2%)
IT-T4-11Z-ZB-2	I-Test 1 x gas inlet and T4 Module for UL Regional Settings (CH4 set to 2.5%)
IT-T4-11Z-ZB-3	I-Test 1 x gas inlet and T4 Module for Inmtero Regional Settings (CH4 set to 2.2%)
I-Test Accessories
C03332	Demand flow regulator, 1-3 litre/min
AC0510	Cylinder holder (wall mount) for 34L to 112L cylinders
T4 Spares
Product Code	Description
SS0112	0-100% LEL (T4 Type 2)
SS0501	0-30% Oxygen (3 Year) (See Common Spares tab for pricing)
SS0301	Carbon monoxide 0-1000 ppm (T4) 0-2000ppm or 0-500ppm (H2S & SO2 filtered) (Gas-Pro) (See Common Spares tab for pricing)
SS0302	Carbon monoxide 0-1000 ppm (T4) 0-2000ppm (Gas-Pro) (H2 filtered) (See Common Spares tab for pricing)
SS0303	Hydrogen sulphide 0-100 ppm (See Common Spares tab for pricing)
M040003	Sensor Blank
T4-PCB-M	T4 main board
T4-PCB-S	T4 sensor board & sensor insulator
T4-SCR-20	T4 case screws, pack of 20
T4-LCD	T4 LCD screen & shock gasket
T4-FRC-O	T4 orange front case with Crowcon bubble label
T4-BKC-OC	T4 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/U	T4 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-OD	T4 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)
S012342	T4 battery
M050091	T4 Crowcon branded label
M040166	T4 one piece sensor gasket
M040167	T4 display gasket
T4-AGC	T4 alligator clip + screw
M040168	T4 sensor insulator
M05152	T4 Certification label Specify serial number on order.
M048521	Adhesive flow plate gasket for I-Test (T4)