Crowcon TXgard-IS+

Code: TIP
  • Intrinsically safe
  • Toxic gas detection
  • Intuitive display

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Versatile toxic and oxygen gas detector with LCD display and non-intrusive calibration. Available for detecting a wide range of gases, the Crowcon TXgard-IS+ is Intrinsically Safe, ATEX and IECEx certified for use in Zone 0, 1 or 2 hazardous areas, and UL and cUL certified for use in Division 1 or 2 hazardous areas.

The TXgard-IS+ uses an electrochemical sensor within a re-usable bayonet housing. Supplied with carbon loaded nylon junction box, which contains the amplifier/transmitter to provide a 2-wire 4 to 20mA output (M20 cable gland entry). The LCD has a 2 x 16 character display with menu functions accessed via a keypad.


Non-intrusive calibration

  • Calibration can be performed locally without hot work permits and minimises operational downtime.
  • Local display and buttons enable calibration without opening the junction box

Flexible output options

  • 4-20mA current sink – works with a wide selection of control panels
  • Two-wire format

Rugged and reliable

  • Made from tough carbon loaded nylon
  • Ingress protection to IP65 as standard

Low cost of ownership

  • Non-intrusive one-person calibration – easy to operate and maintain
  • Long-life sensors – keep interruption to on-site activity to a minimum
  • Simple parts replacement

Wide range of sensors

  • Extensive range of electrochemical sensors for toxic gases and oxygen


Size 160 x 123 x 92mm
(6.3 x 4.8 x 4.5ins)
Weight 0.7kg (1.5lbs)
Ingress protection IP65
Enclosure material Junction box: Carbon loaded nylon
Sensor housing: ABD Plastic
Power 8-32Vdc, 4-20mA loop-powered
Cable entries 1 x M20 or 1/2” NPT with adaptor
Operating temperature -20°C to +55°C (-4°F to 132°F) *
Humidity 15 to 90% RH non-condensing
Display 2-Line, 16 character LCD
Calibration method Via push-buttons
Electrical output Two-wire 4-20mA sink
Terminals Suitable for up to 2.5mm2 cable
Sensor type Electrochemical
Repeatability +/- 2% FSD typically
Zero drift +/- 2% FSD, six months typically
Response time Contact Crowcon for a full list of sensor response times
Performance Tested in accordance with EN60079-29-1
Hazardous area zones Zone 0, 1 or 2
Division 1 or 2
(when connected via an isolation device)
Approvals Ex II 1 G Ex ia IIC T4 (-40°C to +65°C)
Exia IIC T4 Gb Tamb -20°C to +55°C
UL Class I, Groups A, B, C and D
EMC compliance EN 50270, FCC: CFR 47 Part 15, ICES-003

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Title Size
TXgard-flamgard-plus-Datasheet 213 KB
TXgard-IS-Iss8-Manual 1 MB

Additional information

Weight 0.09 kg

Ordering Information

A Zener barrier or galvanic isolator is required for I.S. operation.

TIP-IV ammonia, 0-50ppm (-20°C min)
TIP-AR ammonia, 0-100 ppm (-20°C min)
TIP-AS ammonia, 0-1000ppm (-20°C min)
TIP-IG carbon monoxide, 0-250ppm
TIP-AH carbon monoxide, 0-500 ppm
TIP-CC chlorine, 0-5ppm
TIP-IS chlorine, 0-10ppm
TIP-AN chlorine, 0-20ppm
TIP-CK chlorine dioxide, 0-1ppm
TIP-IT hydrogen, 0-2000ppm
TIP-IU hydrogen, 0-50% LEL
TIP-AF hydrogen, 0-100% LEL
TIP-AQ hydrogen cyanide, 0-25ppm
TIP-AV hydrogen fluoride, 0-10 ppm
TIP-II hydrogen sulphide, 0-25ppm
TIP-IL hydrogen sulphide, 0-50ppm
TIP-AI hydrogen sulphide, 0-100ppm
TIP-IN hydrogen sulphide, 0-200ppm
TIP-AL nitrogen dioxide, 0-10ppm
TIP-AG oxygen, 0-25% vol
TIP-AP ozone, 0-1ppm
TIP-BB phosgene, 0-1ppm
TIP-CG phosphine, 0-2ppm
TIP-AJ sulphur dioxide, 0-10ppm
TIP-IO sulphur dioxide, 0-20ppm
TIP-IQ sulphur dioxide, 0-30ppm
TXgard-IS+ Accessories
C01338 Spray deflector. For outdoor installations & protection from water sprays.
C01339 Flow adaptor, for use in sampling applications.
00027D Stainless steel duct mounting plate – for GRP junction boxes. Maximum duct airflow: 6m/s. Use TXgard-IS+ detector with side-entry.
C03005 Calibration adaptor
M02025 Cable gland M20 nylon.


Sensor assemblies

Supplied with a sensor contained within an M20 housing. A resistor gain ‘header’ is also supplied, which is only required if changing the range on a TXgard-IS. If direct sensor replacement only is required, this ‘header’ resistor can be discarded.

S011185 ammonia (Sensoric), 0-1000ppm (-20C min.)
S01730 ammonia (Sensoric), 0-50ppm & 0-100ppm (-20C min)
S01171 carbon monoxide (CO-BF)
S01182 chlorine (City): (with 0-5ppm header, may also be used for 0-10ppm detectors provided the original header is retained), (0-20ppm).
S011189 chlorine (Sensoric): for (original gain header within the amplifier must be retained)  (0-5, 10ppm )
S01900 chlorine dioxide (City)
S01642 ethylene oxide (City)
S01728 hydrogen chloride (Sensoric)
S01178 hydrogen cyanide (City)
S01729 hydrogen cyanide (Sensoric)
S01983 hydrogen fluoride (Sensoric)
S01176 hydrogen/Hi (City 3-Series)
S01177 hydrogen/Lo (City 7-Series)
S013000 hydrogen (Sensoric), 0-100% LEL
S011975 hydrogen sulphide (H2S-BH 0-50ppm): Low Range Supplied with a 0-10ppm header
S01170 hydrogen sulphide (H2S-B1 0-200ppm): High Range Supplied with a 0-25ppm header
S01174 nitric oxide (City)
S01175 nitrogen dioxide (City)
S012028 oxygen (7OX-V) 2009 onwards
S01186 ozone (City)
S011201 ozone (Sensoric)
S01640 phosphine (City)
S011987 silane
S01172 sulphur dioxide
S011226 sulphur dioxide – hydrogen immune
S01641 volatile organics (City)
S01343 Bayonet sensor housing for 3-pin 32mm diameter sensors


S011160/S Personality module for ozone or chlorine detectors
S01997/S Personality module for oxygen detectors (1-year C/2 sensor)
S011007 Terminal PCB (Baseboard)
E01755 Front panel display/membrane label
M07214 Installation, Operating and Maintenance Manual

ATEX Spares since 2008

S011051 Terminal PCB (Baseboard)
S011050 Main/Display PCB
S012126/S Personality module for general toxic versions (Non Biased)
S012127/S Personality module for ozone or chlorine detectors (Non Biased)
S012128/S Personality module for hydrogen cyanide or phosgene detectors (Non Biased)
S011052/S Personality module for oxygen detectors (2-year 7OX-V sensor)

UL and cUL Spares since 2008

S011224 Terminal PCB (Baseboard)
S011223 Main/Display PCB

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