Triple Plus+



Intrinsically safe, the Triple Plus+ provides enhanced facilities for safety and detector fleet managers including selection of flammable gas correction factors (so one unit can be used in several locations across a site) and annotation of the data file with user names and site names selected from pre-configured files in the unit.

IR option
IR sensors have very high resistance to interference or inhibition by other gases and are suitable for both high gas concentrations and use in inert (oxygen free) backgrounds where catalytic pellistor sensors would perform poorly.

The unique design of the Crowcon IR sensor module used in Triple Plus+ IR allows measurement of hydrocarbons at both %LEL and % volume ranges making this instrument ideal for tank and line purging applications.

  • No poisoning effects – works well where catalytic pellistors would perform poorly
  • Long life sensor and no burnout – reduced cost of ownership
  • % vol. measurement for purging applications – offers flexibility
  • % LEL measurement in air or inert backgrounds
  • Single or dual range measurement
  • IR CO2 detection, 0-5%

Clear and unambiguous

  • Piercing 85dB alarm at 1m – gives you confidence in the status of your Triple Plus+, and the environment you’re working in
  • Vivid LED alarms with top visibility
  • Confidence blip, low battery and TWA warnings
  • Timed data logging with 100-hour capacity

Simple to customise

  • Wide range of electrochemical oxygen and toxic gas sensors – allows you to create your optimum 4 gas Triple plus+
  • Available for diffusion, manual aspiration or pumped sampling
  • Interchangeable sensor modules
  • Comprehensive data logging with site and user names


  • TriaxTM casing will not crack or shatter when dropped – system integrity and operation assured
  • Unique internal design will resist the harshest treatment
  • Full buoyancy – makes recovery from water possible

Easy to maintain

  • Simple WindowsTM Software interface – user menus allow calibration with or without connecting to a PC
  • QuickCal for rapid calibration


Size 118 x 200 x 73mm (4.65 x 7.8 x 2.9ins)
Weight 880g gas (31oz)
Alarms Piercing, rapid intermittent, piezo-electric tone 85 dB at 1 m Confidence blip (selectable) Distinctive double blip for low battery with user accept
Gas hazard: vivid flashing red LED Instrument is working: slow flashing green LED Low battery: distinctive double flash of green LED
Display 2 lines of 24 characters, dot matrix high contrast LCD with back light operating for 30 minutes Values and units for up to 4 gases displayed simultaneously at current, TWA or peak levels Low battery, pump failure, real time and elapsed time, calibration and configuration data also displayed
Data logging Adjustable sample rate, 100 hours at 1 minute sample rate (maximum 6000 data points per channel), logging of events, user and site
Battery Rechargeable Li-ion batterypack
Standard instrument >12 hours
Pumped instrument >10 hours
Charging: Dual rate drop-in charger; Dual rate charger/PC interface 
Expected sensor life Flammable: 5 years (Triple Plus+)
IR: 5 years (Triple Plus+ IR)
Toxic: 3 years (typically)
Oxygen: 2 years
Typical response times Methane 20s (Triple Plus+) IR 20s (Triple Plus+IR), Oxygen 10s, typical Toxic Gas 20s
Sampling Optional internal electric pump with on/off button
Operating temperature -20°C to +50°C (-4°F to 122°F)
Humidity 20 to 90% RH non-condensing
Ingress protection IP65
Approvals Europe: ATEX II 2G: Ex ib d IIC T4 Gb Ta  -20°C to +50°C
Safety standards Europe: EN50014, EN50020, EN50018-2, EN50270, EN50082-2

North America: UL 913, CSA 22.2 No.157 (SFA3009 Triple Plus+)

Calibration Tetra can be routinely calibrated manually using the menu, using Crowcon Protables PC software.
Accessories Leather case is sold as an integral part of the unit and is not an accessory.

Standard: Manual, shoulder strap and allen keys (pumped units include additional flow plate, 2m hose and pouch)
Optional: Straight and telescopic probes, water trap, baffle plate, aspirator, calibration flow adaptor and hose

The Triple Plus+ has two dual rate charging solutions supplied with UK, EU, US plug and without plug configurations. A vehicle adapter for in-vehicle charging is also available.
• Standard drop-in charging cradle
• PC interface charger

Gases and Ranges

Gas Range Standard Alarm (UK)
Triple Plus+ & Triple Plus+ IR
Flammable 0-100% LEL  20% LEL
Oxygen (O2) 0-25% vol 19/23.5% vol
Hydrogen sulphide (H2S) 0-50ppm 5ppm
Carbon monoxide (CO) 0-500ppm 30ppm
Sulphur dioxide (SO2) 0-10ppm 1ppm
Chlorine (Cl2)* 0-5ppm 0.5ppm
Nitrogen dioxide (NO2) 0-10ppm 1ppm
Ammonia (NH3) 0-50ppm 25ppm
Non-flammable Hydrogen (H2) 0-2000pm N/A
Hydrogen cyanide (HCN) 0-25ppm 10ppm
Hydrogen chloride (HCL)* 0-10ppm 1ppm
Phosphine (PH3)* 0-2ppm 0.1ppm
Triple Plus+
Fluorine (F2)* 0-10ppm 1ppm
Methane (CH4) 0-100% vol N/A
Chlorine dioxide (CLO2)* 0-1ppm 0.1ppm
Hydrogen (H2) (Electrochemical) 0-100% LEL 20% LEL
Hydrogen fluoride (HF)* 0-10ppm 2ppm
Ethylene oxide (ETO)* 0-10ppm 5ppm
Nitric oxide (NO)* 0-100ppm 25ppm
Triple Plus+ IR
Flammable 0-100% vol No alarm
Carbon dioxide (CO2) 0-5% 0.5/ 1.5%

*unpumped units only


Below is a small selection of the accessories available for the Triple Plus+.

Charger/Interface II for UK only


Charger/Interface II for Europe only


1 m Rigid Sample Probe


For sampling remotely eg into chambers during re-entry checks.

Telescopic Sample Probe


For sampling remotely eg into chambers during pre-entry checks. Extends from 85cm to 155cm.

Standard sampling hose


Supplied by the metre. Contact sales team for custom length requests.

In line water trap/particulate filter


Protects detector sensors from particles and moisture. Includes filter element.

Replacement water trap filters


Replacement filter elements for FIL29001. (Minimum order 10 elements).

Six metre drop line


Six metre drop line for undertaking pre-entry checks with TriplePlus+.

Carrying case and belt


Carrying base and belt.

Drop-in charger


Charger with multi-region power supply (includes UK, EU, US, and Australian plug adaptors)

Computer lead for TriplePlus+ Interface


9 way lead for connecting TriplePlus+ Charger Interface to a PC.

Vehicle Charging lead


For vehicle lighter socket. Use with charger cradle.

Waist belt


Waist belt