Part Number: 65-1080S-xxx (xxx denotes gas)


D-Guard²S offers a built in relay board with accompanying sounder strobe. This setup allows for a flexible onsite solution for a fixed monitoring and alarming combination without the need to run cabling back into controllers. This allows for a dramatically 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.

List of Benefits

  • Built in sounder strobe and relay board
  • HART 7.0 communications
  • 5 year, O2 sensors
  • 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
  • High impact anti-static housing
  • IP65 rated


Designed from the ground up to provide reliable, accurate and flexible gas detection, the D-Guard²S incorporates leading edge technology. From the basic design philosophy that includes functional safety compatible techniques, through to the advanced functionality that provides repeatable and dependable performance. D-Guard²S is powerful, yet simple to use, making it an ideal single solution detector with low ownership cost.

Inclusion of HART communications enables access to a greater depth of information than is possible over a basic current loop signal. Real time gas readings, diagnostic information and sensor testing are available via the HART link. Remote current loop rescaling and test mode triggering is also possible via the HART link.

D-Guard²S 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. Sensor temperature compensation results in long term stability, accuracy and reliability. D-Guard²S continually monitors the sensor temperature and applies corrections to both the zero operating point and the response to gas, allowing the detector to remain steady under zero gas conditions and accurate when measuring gas concentration.

Response time testing functionality is integral to D-Guard²S to give a true measurement of dynamic gas monitoring performance. As standards begin to emerge requiring such testing to be carried out, D-Guard²S is equipped to make the task simple. D-Guard²S has been designed to efficiently allow the use of a single board to cover all detector types and ranges for toxic gases, oxygen, flammable gases and carbon dioxide. Configuration is simple and quick via the user interface which is accessed by the supplied magnetic stylus. D-Guard²S is housed in a specialised highly impact resistant non-conductive plastic, static preventing enclosure, which is UV stable.

SpecificationDetail Description
Typical range of Gases Detected
Ammonia (NH3) 0 to 100 ppm in 1 ppm increments
Carbon Monoxide (CO) 0 to 100 ppm in 1 ppm increments
Carbon Dioxide (CO2) 0-1.5% v/v in 0.01% Vol increments
Chlorine (CL2) 0 to 10 ppm in 0.1 ppm increments
Ethylene Oxide (ETO) 0 to 20 ppm in 0.1 ppm increments
Hydrogen Cyanide (HCN) 0 to 50 ppm in 1 ppm increments
Hydrogen Sulfide (H2S) 0 to 200 ppm in 1 ppm increments
Hydrogen Chloride (HCL) 0 to 200 ppm in 1 ppm increments
Nitric Oxide (NO) 0 to 100 ppm in 1 ppm increments
Nitrogen Dioxide (NO2) 0 to 10 ppm in 0.1 ppm increments
Oxygen (O2) 0 to 25% in 0.1 %Vol increments
Ozone (O3) 0 to 2 ppm in 0.01 ppm increments
Phosphine (PH3) 0 to 1 ppm in 0.01 ppm increments
Sulfur Dioxide (SO2) 0 to 10 ppm in 0.1 ppm increments
Other gases and rangesAre available on request
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
Relay Output 1 Low Alarm - Single Pole Double Throw (SPDT)
Relay Output 2 High Alarm - Single Pole Double Throw (SPDT)
Relay Output 3 Fault - Normally Energised
Input Power 10-30VDC
Response Time Typical response T90 in less than 40 sec (Toxic) and less than 10 sec (CH4), cell dependant
Operating Temperature -20.C to +70.C (-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
Sounder Strobe 98dB, flashing red
IP Rating IP65
Warranty 2 Years on Instrument
Sensor warranty varies with cell

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