GasTech Australia Smart Guard series S-GuardTM Series GTD-2000Tx hydrocarbon Gas detector is a Toxic gas and Oxygen smart transmitter. The electrochemical elements are self-compensating. The industry standard 4 -20 mA analog output provides remote alarm, fault and calibration signals.
 

GasTech Australia Smart Guard series S-GuardTM Series GTD-2000Ex hydrocarbon Gas detector is a catalytic smart  transmitter. The sensing and reference elements are self-compensating for temperature integrity. The industry standard 4 -20 mA analog output provides remote alarm, fault and calibration signals.
 

GasTech Australia Smart Guard series S-GuardTM Series GIR-3000 hydrocarbon detector is a single source dual wavelength instrument. The sensing and reference elements are self-compensating for optical integrity and other signal inhibitors. The industry standard 4 -20 mA analog output provides remote alarm, fault and calibration signals.
 

GasTech Australia Smart Guard series S-Guard^TM Series GIR-3000 hydrocarbon detector is a single source dual wavelength instrument. The sensing and reference elements are self-compensating for optical integrity and other signal inhibitors. The industry standard 4 -20 mA analog output provides remote alarm, fault and calibration signals.
 

The H-Guard-L is a CO2 transmitter series designed to be installed in HVAC applications. The CO2 sensing element uses the Non-Dispersive Infrared Technology (NDIR) with the patented self-calibration system to guarantee the long term stability and up to 15 years life time. H-Guard-L duct probe transmitter offers temperature and humidity option. The high accuracy temperature and humidity combined sensor provide a digital interface and outstanding full range linearity. The one or three analogue 0-10V or 4~20mA outputs are selectable by jumpers. Modbus RS485 communication interface is provided. Optional backlit LCD can display all measurements and is usable easily in more applications. H-Guard-L offers simplicity in design and installation with the special  demountable and replaceable filter to avoid pollution and influence of measurement.