Sigma offers a variety of options to cover most of your applications, some of which are listed hereunder

Sigma 95H series

Sigma 95H series wall mounted type of gas detector with alarm light, is monitoring gas concentration in different applications 24h continuously. Using high quality sensors, and advanced micro-process technology, with data display, high/low alarm, offers fast response, high precision and good stability.
Powered by 24V DC, with 4-20mA, RS485, relay signal output and Explosion proof, is suitable for different kinds of applications.

Features
Monitor the specific gas concentration in the environment and activates the alarm when it is over the set point.
With self-calibration and zero calibration function, it makes the detection more accurate and reliable.
With temperature compensation, it is able to function under conditions of different temperatures.
A two-stage alarm (High/Low) with sound and light, is user adjustable.
An Infrared controller can adjust remotely the alarm point settings, zero calibration, and address modification.
Can output one or two on-off signals, to drive ventilator or
solenoid valve and other external devices.
Working Voltage：12-36V DC
Housing：die-cast aluminum + stainless steel (alarm light)

Product advantages
Using high quality sensors.
Standard equipped with three-wire system 4-20mA analog output; relay output; RS485 output (optional)
Unique infrared non contact control
Compatible with all kinds of control alarms, PLC, DCS and
other control systems, can be remote monitored.
Explosion-proof design, fast, reliable and stable.
Explosion-proof grade: II 2G Ex db IIC T6 Gb IP65
With self-calibration function and three standard keys will be used for on-site maintenance.

Technical Specifications
Gas Detected: As ordered from a variety of different gases
Detection Principle: Catalytic, Electrochemical, IR
Measuring Range: depending on the application
Installation Method: Wall-mounted, piping type, flow-type(according to the detection application)
Output signal 4-20mA, 1-5V, 2-10V, RS485, RS232, relays (optional)
Precision ≤±3%F.S. (higher precision is optional)
Zero shift ≤±1%（F.S./year）
Display 4 digits Nixie tube display.
Connection mode G1/2 external thread explosion-proof flexible pipe
Thread Size M45*2mm
Temperature –20℃～50℃
Humidity 0-95%RH (non-condensing)
Explosion-Proof Ex dⅡCT6
Protection rating IP65
Alarm mode Sound, light
Material Case: Die-cast aluminum
Sensor housing: aluminum alloy or 316 stainless steel
Power 12-36V DC
Dimensions 180×150×90mm
Weight ≤1.6kg

Gases,

CO, H2S, O2, EX/CH4, N2, NH3, CL2, H2, CH2O, O3, CO2, NO, NO2, SO2, ETO, PH3, HCL, HCN, COCL2, CLO2, SiH4, F2, HF, HBr, H2O2, B2H6, AsH3, GeH4, N2H4, THT, Br2, C2H2, C2H4, CH3OH, C2H5OH, CH4S, C8H8, C4H6, VOC/TVOC, CH3Br, C6H6, C7H8, C8H10. Other gases on request.

SIGMA 8000 Series – Multiple Gas Analyzers (up to 18 gases)

The all in one compact lightweight user friendly analyser that helps users to monitor multiple gases at the same time

The Sigma 8000 Series gas analyzers can detect up to 18 gases at a time. They can incorporate electrochemical, infrared, catalytic sensors, zirconium, thermal conductivity, ions, ultraviolet radiation and other detection principles, focusing on the accuracy of gas detection.
The Sigma 8000 series gas analyzers are also data collectors that can quickly retrieve and analyze the gas concentration components for scientific or university research and complex work environments or applications.

Technical Characteristics
Accurate and reliable gas sensors
Fast warm-up and fast response time
Multiple industrial gas sampling capabilities with ten pump flow options.
The gas detection flow can be adjusted according to different test environments. Each unit is equipped with a multi-level filtering device, which can effectively filter oil, water, dust and other impurities.
3.5-inch LCD screen with 320 * 480 resolution, well-designed and useful menu interface
Ability to display multiple indications
Ability to display one or more curves, data and other indications of gas concentrations that you can change.
Various gas collection units with the possibility of change.
Functionality with many possibilities
Articulated internal structure, supporting 1-18 gas detection requirements
Simple and quick screen settings
Monitoring temperature, humidity and pressure at the same time (Optional)
Ability to select Bluetooth, ZIGBEE, WIFI, GPRS and other wireless modes (optional)
The analyzer can be equipped with a built-in printer or an external Bluetooth printer, to perform the printing function (optional)
High temperature, high humidity measurement (Optional)
DATA RECORDING
High speed storage function (storage space can be customized to your requirements when ordering)
Independent SD memory card, through which historical data can be displayed or deleted
Rechargeable
High capacity rechargeable polymer lithium battery, long life and standby time
Mini-USB interfaces with common data and charging cable
High quality materials
Selected wear-resistant housing material, suitable for various industrial environment applications

Sensors: Up to 18 different sensors can be combined.
Measurement range: 0 ~ 1, 10, 100, 1000, 5000, 50000, 100000 PPM, 0-100mg / L, 200mg / L, 0-100% LEL, 0-10%, 20%, 50%, 99.999% 100% Vol (Measurement range is optional and customised)
Analysis: 0.001 PPM (0-1 PRM), 0.01 PPM or 0.001 PPM (0-10 PPM), 0.1 PPM or 0.01 PPM (0-100 PPM), 1 PPM or 0.1 PPM (0-1000PRM).
1 PRM (0-1000 PRM brain), 0.01 mg / L (0 ~ 200% mg / L), 0.1% LEL (0-100% LEL), 0.01%
Accuracy: ± 2% F.S (higher accuracy optional)
Temperature & Humidity Temperature: -20 to 50 ℃, resolution: 0.1 ℃, Humidity: 0-99% RH, Analysis: 1% RH
Pressure: 0.5 - 2.0 bar (Optional)
Screen: 3.5 inch LCD screen with 320 * 480 resolution
Screen: type, data set, unit, curve, battery power, time, temperature, humidity, pressure (optional), pump status, wireless mode, printer status,
Alarm: vibration, red LED and screen alarm status, error alarm, abnormal pump alarm, low battery alarm
Data storage: An independent SD memory card, Max.32G, automatic data recording function, can adjust the recording time

Signal / data output: RS232, RS485, can be downloaded to the computer in TXT files via USB connection. Optionally it may be equipped with computer software so that users can download, store, analyze and print data
Print function (optional): Optional with internal portable printer or external Bluetooth printer
Print content (optional): Text, graphics, one-dimensional code, qr codes, curves, characters, etc.
Charger: Basic Mini-USB charging port, equipped with a special 13V / 2A charger (internal printer) or standard 5V / 2A charger (external printer)

Battery: High capacity rechargeable lithium polymer battery, 5400 mAh / 11.1V (internal printer) or 10000mAh / 3.7V (external Bluetooth printer), for single gas: 32 hours continuously. for a lot of 6 gases: 24 hours continuously
Humidity: 0 ~ 95% RH (no condensation) (optional filter device is available if there is high humidity)
Temperature: -20 ℃ ~ + 50 ℃, Optional gas sampling probe, can be used for up to 1200 degrees
Protection rating: IP65
Explosive protection: Ex ic IIC T3 Gc
Weight: 3700g
Warranty: 12 months

Applications
Sigma 8000 Analysers can be used in many sectors and applications i.e. petrochemical, chemical, pharmaceutical, environmental protection, air pollution, etc.

Partial list of detectable gases

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