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NDIR Flow Gas Module
The S-MODULE EVO FLOW are based on the infrared absorption technology and comply with the highest standards in accuracy, reliability and efficiency. Due the consequent use of this optical principle the systems work without abrasion or chemical reactions and are nearly maintenance free. As basis the IR principle uses the individual absorption spectrum of the gas to be detected and specifies the concentration by the precise quantitative analysis. Because all measured gases absorb IR radiation in a different spectrum a so called “fingerprint” is given which ensures a selective characterization with less cross sensitivities. An integrated evaluation electronic delivers finally an easy to use concentration signal and compensates all temperature- and drift effects.
| Detection Principle | NDIR (Dual Beam) |
| Measuring Range | See List |
| Gas Supply | Flow |
| Dimensions | See Mechanical Data |
| Hose connection | 3mm internal, 5mm outside |
| Response time (T90) | Appr. 12 s (@ 0.7 L/min) |
| Digital Resolution(@zero) | 1 ppm ...0.1 Vol.% |
| Detection Limit (3sigma) | ≤ 1 % FS(typically) |
| Repeatability | ≤ ±1 % FS |
| Linearity Error | ≤ ±1.0 % FS ( or ≤ ±1.5 % FS depend on version) |
| Stability (zero) | ≤ ±2 % FS during 12 month |
| Stability (span) | ≤ ±2 % FS during 12 month |
| Temperature Drift. (zero) | ≤ ±0,1 % FS per °C |
| Temperature Drift. (span) | ≤ ±0,15 % FS per °C |
| Pressure Drift. | 0,1 % up to 0,2 % Value per mbar |
| Operating Temp | 0 °C up to 50 °C |
| Storage Temp | -20 °C up to 60 °C |
| Ambient Humidity | 0 % up to 95 % rel. Humidity (not condensing ) |
| Ambient Air Pressure | 800 up to 1200 mbar |
| Warm up Time | < 2 minutes (cold start ) < 30 minutes full specification |
| Flow | 0,1 up to 1,0 L / min (const ) |
| Digital Output | Modbus ASCII RTU TTL 2400-115.200 auto Baud/ auto Frame Out 1 Signal output TTL |
| Option : Analog Output | 0 / 4 … 20 mA (With S-Connect) 0 / 0.2...1V (With S-Connect V) RS 232 (With S-Connect) RS 485 (With S-Connect RS485) |
| Operating Voltage | 3,3 to 6 V DC ± 5 % |
| Drive Current | < 240mA@5V ( average ) |
| Power consumption | < 800 mW |
The S-MODULE EVO FLOW housing is made of aluminum to protect the sensor from mechanical damage and is with fitted with gas line connectors (inlet and outlet) to allow perfusion of the S-MODULE EVO. Tubing with an internal diameter of 3 mm and external diameter of 5 mm is needed to connect up to the measurement cell. Ensure that tubing is securely attached to the inlet and outlet connectors.