Gaseous toxic substances are especially dangerous because they are usually invisible and often odourless. It should be kept in mind that their physical behaviour is not always predictable since their temperature and pressure affect their properties dramatically as well as the effects of draughts.

In each category the required gas monitoring system can be one of two types. For minor risk applications, a simple gas monitor interfaced with a panel that sounds an alert may be adequate. Higher risk applications often require continuous (e.g., 4-20 mA) output sensors; however, before integrating the sensors into the control system consider the risk when the control system is unavailable, such as during upgrades, sensor replacements, service etc.
We offer both simple and complex systems.

INDUSTRIES WHERE TOXIC GASES ARE FOUND

AMMONIA
Refrigeration Plant
Clean Water Sites
Chemical Manufacturers
Fertiliser Manufacturers
Refrigerated Storage Depots
Food Processing Engineers
Plastics & Foams
Currency Manufacture CARBON DIOXIDE
Breweries
Food Manufacture
Mushroom Growing
Landfill Sites
Water & Sewage Plant
Refrigeration Plant
Chemical Industries CARBON MONOXIDE
Car Parks
Power Stations
Steel Works
Generating Plant
Mine Shafts
Chemical Companies
Garages
Metal Refinery & Heat Treatment
Underground Work
Nuclear Engineering
Laboratory
Car Manufacturing Plant
Tunnels
CHLORINE
Clean Water Plant
Paper Manufacturers
Chemicals & Plastic
Manufacturers
Food Industry
Textiles HYDROGEN CYANIDE
Gold Refining
Acid Gases
Petrochemical Plant
Chemical Engineers
Laboratory
Pharmaceutical Manufacture
Hospitals HYDROGEN FLUORIDE
Hospitals
Pharmaceutical
Leaded Petrol Manufacturing
Chemical Companies
HYDROGEN SULPHIDE
Dirty Waste Water Sites
Petrochemical Companies
Offshore Companies
Tunnelling Contractors
Man Entry Applications
Chemical Companies
Laboratories
Dye Makers
Mines NITRIC OXIDE &
NITROGEN DIOXIDE
All situations where there are
combustible emissions
therefore tunnels. car parks.
loading bays etc. SULPHUR DIOXIDE
Water Purification
Unclean Water Sites
Light Bulb Manufacturers
Power Stations
Paper Mills
Pet Food Manufacturers
Power Generating Plant
Steel Manufacturing
Exposures to toxic gases must be calculated on the Time Weighted Average (TWA) basis, which is the medium concentration relevant to a common 8 hours working day, at which it is considered that all employee can be exposed without injuring their health.

Exposure limits to toxic gases have been established by occupational safety agencies and may vary according to local directives. They commonly refer to the short term exposure limit (STEL) defined by the American Conference of Governmental Industrial Hygienists (ACGIH). The lower is the STEL –either expressed in ppmor mg/m3 –the higher is the compound toxicity.

ENVIRONMENTAL MONITORING

Sigma 5000-WH
Ambient air quality monitoring system

Product overview
Sigma 5000-WH air quality monitoring system is widely
used in urban air quality monitoring and industrial air
emission pollution monitoring. It can simultaneously
measure various environmental pollution gases,
particulate matter and meteorological parameters in
the air. The system supports RS485 signal
transmission, with data storage and export functions.
Through the wireless acquisition terminal, the
measurement data can be transmitted to the cloud
platform in real time, and can be remotely controlled
through the cloud platform.

Features
✅ 1-9 different gas parameters can be monitored at the
same time, and measurement modules such as particle
parameters and meteorological parameters can be
selected according to user needs
✅ 7-inch color touch screen display, easy to view datas
✅ Equipped with a professional outdoor shield, it can be
perfectly dust-proof and rain-proof, and can continuously
monitor and work steadily in high or low temperature
environments
✅ Standard equipped with storage function, which can store
at least two years monitoring data
✅ It can work 7x24 hours without interruption, with functions
such as real-time data upload, fault self-diagnosis and
automatic restart
✅ Standard output RS485 signal, a set of relay signal
✅ Optional solar power supply panel to support normal
work when without mains power
✅ Optional outdoor LED display large screen, easy to view
real-time data at any time
✅ Optional adapter card and PC software, real-time viewing
of concentration and historical data on the computer.
✅ Optional 4G DTU and Lora wireless module, real-time upload
gas concentration value to the ecological environmental
protection bureau, departmental server
✅ Optional camera to realize real-time, remote and automatic
monitoring of dust concentration and on-site video and
image collection

Technical
Gases (up to 9 gases to be chosen when ordering)
Measurement parameters:ozone, sulfur dioxide,nitrogen dioxide, formaldehyde, carbon monoxide, TVOC, etc.;
Measuring range:0-1000ppb, 0-1000ppb,0-1000ppb, 0-5ppm, 0-20ppm, 0-5ppm;
Resolution:1 ppb, 1 ppb, 1 ppb, 0.01ppm, 0.001ppm, 0.001ppm;
Measuring principle: electrochemical, infrared, PID photoion and other principles
Detection accuracy: ±3%.S Response time:≤30S

Particle parameters (optional):
Measurement parameters:PM2.5, PM10, PM0.3,PM1.0, PM10.0, TSP, etc.
Measuring range:0-1000ug/m3, 0-5000ug/m3;Resolution:1ug/m3, 1ug/m3;
Measuring principle: laser principle Response time:≤30S

Meteorological parameters (optional):
Measurement parameters:temperature, humidity,
wind speed, wind direction, air pressure,light intensity, noise, etc.;
Measuring range:-40°C~+120°C, 0~99%RH,0~20m/s, 8 directions, 0~120Kpa, 0~200,000 Lux,30dB~130dB;
Resolution:0.1℃, 1%RH, 0.1 m/s, 1 piece, 1 Kpa,1Lux, 1dB;
Measuring principle:thermocouple, mechanical and other principles

Sampling method: Pump suction
Pump flow rate: 0.5L/min (gas); 1.8L/min (particles/dust)
Monitoring type: Continuous automatic real-time monitoring
Working time: 24 hours continuously
Display screen: 7 inch color touch screen
Display mode: Adaptive display channel number, automaticpage turning
Signal output: RS485、relay、4G DTU（optional）、LORA（optional）,etc
Power supply: 220VAC（AC），0.1A
Working current: <100Ma（Max）
Working voltage: Internal: 24VDC; External: 220V/50HZ AC
Working temperature: -10℃～55℃
Working humidity: 0-95%RH，Relative humidity
Alarm type: Sound and light alarm (optional)
Housing: Anti-corrosion, sun protection, anti-collision
Installation type : Fixed
Dimensions: 480×580×163mm (Excluding external sensors, rainproof beams, and mounting brackets)
Weight: 18kgs
Product composition: This equipment is composed of a pre-processing system and a monitoring factor analysis system
Oil water dust filter: Glass fiber material, PE material, different monitoring factors correspond to different materials