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SmArtGas 4 VOC sensor
SmArtGas 4 is a gas detector specially designed for measuring, monitoring and detecting hazardous gases in explosive (Ex) environments.
Ex environmentsSuitable for explosive (Ex) zones with ATEX and IECEx certification.
Gas DetectorMeasures, monitors and detects hazardous gases in demanding industrial environments.
Rapid ResponseThe pellistor sensor offers half the response time (T90) and ranks among the fastest on the market.
IP67 protectionThe PTFE membrane provides the measuring head with enhanced protection against moisture and dust up to IP67.
SmArtGas 4 is a gas detector specifically designed for measuring, monitoring and detecting hazardous gases in explosive (Ex) environments. It withstands harsh industrial environments where conditions may vary significantly (high temperature, corrosive gases or vapours, mist and dust). The device can be installed in several ways: integrated into the Sigma Gas gas safety system, as a standalone detector, or connected to supervisory systems (e.g. via a 4–20 mA output signal or RS-485 interface). SmArtGas 4 has been developed as a replacement for the earlier models Sigma SmArt and SmArtGas3 and is based on an entirely new electronic solution.
Key benefits
- Suitable for use in explosive (Ex) zones, with ATEX and IECEx certification
- New sensor head (FL or FH) with significantly improved detection capability
- The pellistor sensor offers half the response time (T90) and is among the fastest devices on the market
- Greater sensor head protection against environmental influences, including moisture and dust, thanks to the PTFE membrane (up to IP67)
- Enhanced interface for external connections
- Reduction of long-term drift of catalytic sensors
- Flexible installation: integrated into the system, standalone, or connected to supervisory systems
- Integrated optical and acoustic signalling (depending on configuration)
Technical data
- Product code: PW-044-SG4-X
- Supply voltage: 15–50 V VCC
- Power: 0.3–4 W (depending on configuration)
- Operating environment humidity: 10–90% (long-term), 0–99% (short-term), non-condensing
- Pressure: 1013 ± 10% hPa
- Protection class: IP65 / IP67 (sensor head with FL.M / FH.M membrane), IP66 / IP67 (with OB2), IP63 (other sensor heads)
- Analogue output: 4–20 mA (sink / source), RLOAD_MAX 300 Ω, US_MAX 30 V
- Digital output: 3 x potential-free contact, NO/NC, 24 V / 0.3 A
- Digital communication: RS-485 (Modbus ASCII, Modbus RTU, Sigma Bus / Sigma Safe, Teta Bus)
- Wireless communication: Bluetooth 4.2
- Response time (catalytic sensor, T90): hydrogen ≤ 9 s, methane ≤ 13 s, propane ≤ 17 s, ethanol ≤ 18 s
- Sensor head material: SS316L
- Weight: 3.5 kg
- Cable entry: external thread M20 x 1.5, cables 0.5–2.5 mm²
- Certificates: FTZU 19 ATEX 0028X / IECEx FTZU 20.0007X
- Mandatory periodic inspection: every 12 months (validity of the calibration certificate)
- Installation: on a supporting structure, 2 screw holes 4 mm, hole spacing 127 mm
Product codePW-044-SG4-X
Supply voltage15–50 V VCC
Power0.3–4 W (depends on configuration)
Workplace humidity10–90% (long-term), 0–99% (short-term), non-condensing
Pressure1013 ± 10% hPa
Protection classIP65 / IP67 (FL.M / FH.M), IP66 / IP67 (OB2), IP63 (other measuring heads)
Analog output4–20 mA (sink / source), RLOAD_MAX 300 Ω, US_MAX 30 V
Digital output3 x potential-free contact, NO/NC, 24 V / 0.3 A
Digital communicationRS-485 (Modbus ASCII, Modbus RTU, Sigma Bus / Sigma Safe, Teta Bus)
Wireless communicationBluetooth 4.2
Reaktsiooniaeg (T90)hydrogen ≤ 9 s, methane ≤ 13 s, propane ≤ 17 s, ethanol ≤ 18 s
Measuring head materialSS316L
Weight3,5 kg
Cable entryexternal thread M20 x 1.5, cables 0.5–2.5 mm²
CertificatesFTZU 19 ATEX 0028X / IECEx FTZU 20.0007X
Periodic inspectionevery 12 months (calibration certificate validity)
Installationto the supporting structure, 2 screw holes 4 mm, hole spacing 127 mm
Flexible installationThe device can be installed as system-integrated, standalone, or connected to monitoring systems.
Improved detection capabilityThe new measuring head (FL or FH) offers significantly improved detection capability.
Resistant to environmental impactsWithstands harsh industrial environments with high temperatures, corrosive gases, mist and dust.
Reduced driftLong-term drift reduction in catalytic sensors ensures more stable measurement.
Built-in signallingIntegrated optical and acoustic signalling depending on configuration.
Common questions about this product.
Frequently asked questions
Is the SmArtGas 4 suitable for use in explosive atmospheres?
Yes, SmArtGas 4 is specifically designed for explosive (Ex) environments and holds ATEX and IECEx certifications (FTZU 19 ATEX 0028X / IECEx FTZU 20.0007X).
What are the device's response times for different gases?
The T90 catalytic sensor response times are: hydrogen ≤ 9 s, methane ≤ 13 s, propane ≤ 17 s and ethanol ≤ 18 s.
How often should the device be inspected periodically?
Mandatory periodic inspection must be carried out every 12 months, corresponding to the validity of the calibration certificate.
What connection and interface options does the device offer?
The device supports 4–20 mA analog output (sink/source), 3 potential-free contacts (NO/NC, 24 V / 0.3 A), RS-485 digital communication (Modbus ASCII/RTU, Sigma Bus/Safe, Teta Bus), and Bluetooth 4.2 wireless communication.
What is the device's protection class against moisture and dust?
The protection class depends on the sensor head configuration: IP65/IP67 for sensor heads with a membrane (FL.M/FH.M), IP66/IP67 in combination with OB2, and IP63 for other sensor heads, whereby the PTFE membrane ensures protection up to IP67.
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