Smart sensing electronic just got smarter
Mar 27 2019 Read 511 Times
Membrapor has completely redesigned its universal circuitry for electrochemical sensors. Due to the new power management the energy consumption has been drastically minimised and additionally, it was possible to reduce the operating voltage. In the case of missing supply voltage the sensors are put into a safe state. With the new software, calibration and temperature compensation is easier than ever before. One main feature has remained: With MembraSens you can use also 4-electrode sensors.
MembraSens‘ main circuit board has 1 to 4 programable AFEs (Analogue Front Ends). The PCB has the circuitry for 3 electrode sensors (1 signal) and 4 electrode sensors (2 signals). The smart AFEs enable the operation of the whole range of toxic gas sensors. MembraSens stores configuration, calibration and temperature compensation into the AFE‘s EEPROM (Electronically Erasable Programmable Read Only Memory). MODBUS RTU controls digital communucation for monitoring AFE signal, configuration and calibration. Bus operation with up to 247 Membrasens is possible, this unit communicates via RS-485 interface (TIA/EIA-485). The circuitry can be powered from 4 volts (4...36 VDC) and will monitor the condition of the sensors in power-off mode, including maintenance of electrical bias.
This highly versatile new format offers extensive signalling possibilities: there are various models for ppm calculation, including hydrogen compensation and models for temperature compensation. Operators can be alerted in situations where the alarm thresholds have been exceded. Calibration is possible with and without gas at anytime and zero point calibration is possible directly on mainboard with buttons.
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