The NEW Guardian NG Infrared Gas Monitor For CO2 or CH4

• True volume % readout over a wide range of pressures (pressure compensated)
• Improved screen display provides more information
• Easier set up using on-screen menus
• Digital Alarm set points
• Password protection to prevent accidental or deliberate change of settings
• Graphical display of historic readings possible over a user-defined period
• Easier transfer of data via on board RS232 I/F
• Optional Ethernet I/F
• Relay outputs for control of external devices

The NEW Guardian range of infrared gas monitors offer continuous sampling, high accuracy measurement, and display of target gas concentrations. The Guardian is available in two versions for measuring either CO2 or CH4 gases. The instrument features measurement ranges between 0 – 3000ppm and 0 – 100%. (Note:The guardian does not handle both gasses in one instrument. Please select CO2 or CH4 models in the ordering menu below)

Suitable for a wide variety of applications, these wall-mounted monitors can detect gases from sampling points up to 30 metres away using the integral sampling system.

Our Guardian instruments are easy to install, stand-alone products that require minimum set up. The Guardian is supplied with LCD and digital alarm set-point controls, housed in a robust plastic IP54 rated enclosure to prevent the ingress of particulates and water.

Applications of the Guardian NG

• Landfill gas measurement – Supporting you to capitalise on your waste to energy revenue.
• Biogas – Critical process control for your AD system.
• Personal safety – Key part of your H&S regime.
• Process control – Continuous fixed gas monitoring for cost saving and safety.
• IAQ – Healthy buildings make for productive output.
• Horticulture – Enabling vigorous growth.
• Brewing – Providing safety and

Applications note Bio Gas

Model* Gas measurement range
Guardian NG3000 0 – 3000ppm --
Guardian NG1 0 – 1% --
Guardian NG3
0 – 3% --
Guardian NG5
0 – 5% 0 – 5%
Guardian NG10 0 – 10% 0 – 10%
Guardian NG30 0 – 30% 0 – 30%
Guardian NG100 0 – 100% 0 – 100%
Guardian NG100 BG NA 0 – 100% with biogas background
Accuracy ±2% of full scale**
Operating Temp 0 – 40ºC
Warm-up time
4 - 20 mA or 0 - 20 mA
1 high/low 2 high/low
Power requirements
normal or latch output
Power consumption
on both or on 2 only
warning or fault indicator
Voltage free contacts rating 4 digit LCD and 4 LEDs for alarms and flow
Enclosure rating 8 A 24 DC
Accessories Particle filter (integral seal included)
Ordering Information
Model Description Price from  
Guardian NG CO2 Specify desired range for CO2 $2250.00
Guardian NG CH4 (100%) Specify desired range for CH4 in store $2695.00

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Topac Inc 320 Washington St Norwell MA 02061

781 740 8778
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