D-Guard² offers world leading 2-wire loop powered NDIR methane and carbon dioxide monitoring capability, allowing greater numbers of detectors to be driven from smaller power supplies, reduced cable diameters and reduced barrier complexity. For medium to large installations, this allows for a reduced system install and running cost.

Oxygen monitoring applications now benefit from the optional use of next generation 5 year life oxygen sensors, giving excellent dependability and further reducing system ownership costs.

D-Guard² includes a high resolution ultra low power display with super clear text and graphics. The display offers visibility in low light spaces right through to use in direct sunlight. The user interface is intuitive and provides on screen guidance for carrying out calibration and configuration tasks.

Key Feature
⇒ 2 Wire connection
⇒ HART 7.0 communications
⇒ Leading edge NDIR methane detection
⇒ 5 year, O2 sensor option
⇒ Wide range of toxic gases monitored
⇒ Ultra - Clear high-resolution display
⇒ Display illumination
⇒ Full sensor temperature compensation
⇒ Integrated dynamic response testing
⇒ Timed/HART triggered sensor self-test
⇒ Continuous operating condition monitoring
⇒ Non-intrusive setup and calibration
⇒ Guided intuitive user interface
⇒ Detector isolate feature
⇒ Group I and Group II intrinsically safe
⇒ High impact anti-static housing
⇒ IP66 and IP68 certified


Analogue output : Two wire 4-20mA
Digital Communication : HART 7.0 over two-wire loop
Indication : 400 x 240-pixel Graphical Back Light LCD display
Input Power Group : IIB 13 - 28V
Group IIC 13 - 28V
Group I 13 - 22V
Response Time : Typical response T90 in less than 40 sec (Toxic) and less than 10 sec (CH4), cell dependant
Certified Operating Temperature :
-20C to +70C Group IIC
(-20C to +55C NDIR Version and all other variants)
Humidity Range : 15-90% non-condensing
Accuracy / Repeatability : Less than AS2290.3, ANZ60079.29 and AS4641
Sensor Style : 4 series sized plug in sensors
Calibration : Non-intrusive, magnetic stylus
Drift : Less than 3% signal loss per 12 months
Dimensions : 120mm x 120mm x 95mm
Enclosure : Anti-static / UV stable chemical resistant Delrin
Certification – Intrinsically Safe :
IECEx Ex ia I Ma (-20C ≤Ta ≤ +55C)
IECEx Ex ia IIC T4 Ga (-20C ≤ Ta ≤ +70C)
IECEx Ex ia IIB T4 Ga (-20C ≤ Ta ≤ +55C)
ATEX Ex I M1 / II 1G
ANZEX 18.2002-0
IP Rating : IP66 IP68 (1.2m for 1.5 hrs)
Warranty : 2 Years on Instrument Sensor warranty varies with cell
Part no. : 65-1080-xxx (xxx denotes gas type)
65-1080G-xxx (non-certified version)

Oxygen, Carbon Monoxide, Hydrogen Sulphide, Nitrogen Dioxide, Ammonia, Chlorine, Sulphur Dioxide, Nitric Oxide, Hydrogen Chloride, Ethylene Oxide, Hydrogen Cyanide, Phosphine, Ozone, Hydrazine, Hydrogen Fluoride, Methane.
*Please contact us for more gases.


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