FLOWEVO – Sensor modules for CO2 gas flow applications

The FLOWEVO NDIR sensor modules provide the gas inlet by perfusion. The standard inlet ports have an outer diameter of 5 mm and an inner diameter of 3 mm. The sensor module is a reliable, everything-on-board, low maintenance gas sensor module with a standard digital output interface. The compact construction and the easy-to-handle interface of the FLOWEVO sensor modules make the OEM system or OEM product integration easy. The FLOWEVO sensor modules are characterized by low signal drift, selectivity against influencing gases and long lifetime of the sensor modules.

The FLOW EVO sensor module is composed of a flow tube and has the light source and detector integrated in the cuvette in order to make the optical path in the tube as direct as possible. The IR light source is a special IR emitter, which heats up very fast and makes the warm-up time of the sensor module very short (< 2 minutes). Measuring responses are dependent on what target gas the module is designed for. For a CO2 with 5 Vol.-% measurement range the important parameters are response time < 12 seconds, digital resolution 0.001 Vol.-% and repeatability ≤ ±0.04 Vol.-%. The FLOWEVO sensor module is superior when it comes to span and zero long-term-stability. The span long-term-stability of a FLOWEVO CO2 module is ≤ ±0.1 Vol.-% over a 1000 h period, making stable continuous gas analysis measurement over long times possible.

The current consumption of a FLOWEVO sensor module in continuous mode is low (< 240 mA @ 6.0 V) and the inrush current is < 600 mA. The sensors can be operated in a broad range of temperatures between 0 °C and +50 °C. The digital output signal format is either Modbus ASCII or RTU via UART. Concerning the signal output format, Pewatron offers a connection electronic board, where output signals are converted to industrial standard output formats such as 4-20 mA, 0-10 VDC and RS485.

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