4 to 20 mA Transmitter Board for Electrochemical Gas ... - Diltronic

ELECTROCHEMICAL GAS SENSORS4 to 20 mA Transmitter Board for Electrochemical Gas SensorSuitable for Compact-Sensors (Pin layout: 7-Series)3 5 4 88 45317235523177565756517.0 mmPCD17551743431971.7All dimensions in mm10Transmitter SpecificationsInput voltage requiredOutput at zero gas concentrationOutput at full-scaleSockets PlatingCompliance+12 to +36 Volts DC4 mA (40 mV)20 mA (200 mV)GoldRoHS CompliantOperation of the TransmitterThe transmitter needs a power supply of 12 – 36 V DC to operate. Connect the power source tothe connector (V/C). Pay attention to the correct polarity, otherwise the transmitter can bedestroyed. If the transmitter is not powered the inserted sensor is short-circuited (exception:NO-Sensors).The voltage output signal can be collected between pins 1 und 2. To obtain the current outputsignal, refer to the last section. The output signal has a linear range from 40 – 200 mV and 4 –20 mA respectively.REV.: 09/2009 Page 1 of 2Phone: +41 43 311 72 00MEMBRAPOR AGFax: +41 43 311 72 01 Birkenweg 2Email: info@membrapor.chCH-8304 Wallisellen /Zurichwww.membrapor.chSwitzerland

Transmitters for NO-Sensors are equipped with a potentiometer to adjust the bias-voltage. Thisvoltage can be measured between position 4 and 5. Transmitters for NO-Sensors are deliveredwith an adjusted bias-voltage of 300 mV.7543VC2 14Output 40 -200 mV+ 24 VoltPower Supply0 VoltSpan- +Zero5To adjust Bias-Voltage(with NO and ETO-Sensors)To control adjusted Bias-Voltage(with NO and ETO-Sensors)4: COM5: 0 - +/- 350 mVCalibrationThe spring on the sensor must beremoved before insertion in theelectronic circuit.There are two potentiometers on thecircuit board to calibrate thetransmitter together with a sensor. Toadjust the zero point, purge thesensor with synthetic air at a flow ofaround 30 l/h for at least 3 minutes.Adjust the potentiometer “zero” to getan output signal of 40 mV.Use the maximum gas concentration allowed by the specification of the particular sensor toadjust the rang of the output signal. Purge the sensor with this gas mixture. When the signal isstable, adjust with the potentiometer “span” the gain to reach an output signal of 200 mV.If you use a gas mixture with an analyte gas concentration lower than the maximumconcentration, calculate the appropriate output signal using a linear relation ship.Operating the Transmitter in current modeThe transmitter can be operated in a 2-wire mode. The current being drawn (4-20 mA) is linearto the sensor signal and therefore the sensor signal can be obtained from the supply current.This setup is widely used in (Multi-Channel) Gas Detectors:Point of measurement Distance Your device- +ZeroGain12Signal Output1 - 5 VoltPower Supply250 Ohm 0 Volt+ 24 VoltIo : 4 - 20 mACurrent is proportionalto the Sensor SignalREV.: 09/2009 Page 2 of 2Phone: +41 43 311 72 00MEMBRAPOR AGFax: +41 43 311 72 01 Birkenweg 2Email: info@membrapor.chCH-8304 Wallisellen /Zurichwww.membrapor.chSwitzerland