
GasTech Australia has released the latest series of GasTech’s digital gas detectors the C-GuardTM. This new style of gas detector uses an advanced processor and program logic, making the C-GuardTM the most reliability and lowest cost total ownership on the market.
The main application for the C-GuardTM range is commercial uses, Car Park, and HVAC applications. This market requires a detector that is extremely reliable and very quick to calibrate.
Our engineers have developed high end electronics and a program that monitors the sensor’s outputs and is tailored to and pre-programmed for many different gas types. The program and electronics process the sensor’s output trends and calculates accurate and stable readings. This is transmitted back to the processor using the industry standard 4-20mA.
One card to suit all applications is the philosophy. Many of our customers are in remote locations around the world and holding stock for all the different kinds of detectors and ranges that they have on site
is expensive and difficult to manage. In the C-GuardTM design this card had to be easily configured for the different gasses, ranges, sensors styles and must have enough program memory to hold the logic for
each type of gas. Our engineers were able to achieve all this, with enough resources still available to implement many future features.
Each card will be simple to upgrade as needs change.
Housing is an IP 65 strengthened high impact polymer, which is UV stable and is virtually indestructible. The design of the housing was to meet the most challenging condition encountered. Grey coloured to blend in with the walls in car park application.

programmable processor control
| Analogue Output | Two wire 4-20mA |
| Indication | 3 LED indication of status |
| Input Power | 10-30VDC |
| Response Time | 90% full scale response in less than 40 seconds sensor dependent |
| Operating Temperature | -20˚C to +50˚C |
| Humidity Range | 0-95% non condensing |
| Accuracy | ±5% of reading |
| Repeatability | ±1% of reading |
| Sensor style | 4 series plug in sensors |
| Calibration | Non intrusive push buttons, no screwdrivers or meters needed |
| Drift | Less than 5% signal loss per year |
| AS1668.2 test | 5 minutes operation at 12mA output |
| Weight | 250g |
| Dimensions | 140mm x 56mm x 100mm (125 including cable gland) |
| Enclosure | High impact UV stable Chemical resistant Nylon |
| IP Rating | IP65 |
| Warranty | 2 Years on sensor and electronics for CO & H2S 1 year on all other sensors |
| 65-1020-CO | C-Guard CO detector 0-100pm |
| 65-1020-CO-1 | C-Guard CO detector 0-150pm |
| 65-1020-CO-2 | C-Guard CO detector 0-200pm |
| 65-1020-H2S | C-Guard H2S detector 0-100ppm |
| 65-1020-HCN | C-Guard HCN detector 0-100ppm |
| 65-1020-NH3 | C-Guard NH3 detector 0-100ppm |
| 65-1020-NO2 | C-Guard NO2 detector 0-10ppm |
| 65-1020-NO2-1 | C-Guard NO2 detector 0-20ppm |
| 65-1020-SO2 | C-Guard SO2 detector 0-10ppm |
| Carbon Monoxide (CO) | 0 to 100 ppm | 100 ppm |
| Carbon Monoxide (CO) | 0 to 150 ppm | 100 ppm |
| Carbon Monoxide (CO) | 0 to 200 ppm | 100 ppm |
| Nitrogen Dioxide (NO2) | 0 to 10 ppm | 5 ppm |
| Nitrogen Dioxide (NO2) | 0 to 20 ppm | 10 ppm |
| Hydrogen Sulphide(H2S) | 0 to 100 ppm | 25 ppm |
| Hydrogen Cyanide (HCN) | 0 to 100 ppm | 10 ppm |
| Sulphur Dioxide (SO2) | 0 to 10 ppm | 5 ppm |
| Ammonia (NH3) | 0 to 100 ppm | 25 ppm |
| Others available on request | ||