Recording from Figaro Gas Sensors - Revision history

Oliver: /* Experimental Setup */

2013-07-11T07:57:10Z

‎Experimental Setup

Oliver: /* Experimental Setup */

2013-07-11T07:55:49Z

‎Experimental Setup

Oliver at 07:53, 11 July 2013

2013-07-11T07:53:27Z

Oliver: /* Setup */

2013-07-11T07:49:17Z

‎Setup

Oliver: /* Setup */

2013-07-11T07:48:47Z

‎Setup

Oliver: /* Setup */

2013-07-11T07:48:25Z

‎Setup

Oliver: /* Setup */

2013-07-11T07:47:08Z

‎Setup

Oliver: /* Setup */

2013-07-11T07:46:25Z

‎Setup

Oliver: /* Setup */

2013-07-11T07:45:14Z

‎Setup

Oliver: Undo revision 1309 by Oliver (talk)

2013-07-11T07:42:00Z

Undo revision 1309 by Oliver (talk)

@@ Line 17: / Line 17: @@
 The sensor requires two voltage inputs, which are supplied by the e-corder: the heater voltage and the circuit voltage.  The heater voltage is applied to the integrated heater in order to maintain the sensing element at a specific temperature which is optimal for sensing.  Circuit voltage is applied to allow measurement of voltage across a load resistor which is connected in series with the sensor.
-The Arithmetic calculation function in the Chart software is used convert measured voltage to sensor resistance. For example, for the TGS 2620 ethanol sensor, Equation 1 is used.
+The Arithmetic calculation function in the Chart software is used convert measured voltage to sensor resistance. For example, for the TGS 2620 ethanol sensor, Equation 1 is used. When the ambient temperature and humidity is taken into account, the Sensor resistance can be converted to the concentration of the gas.
           <math>R_s = \tfrac{V_C - V_{RL}}{V_{RL}} \times R_L</math>          Equation 1.
 where sensor resistance (R<sub>s</sub>), circuit voltage (V<sub>C</sub>), measured voltage (V<sub>RL</sub>) and load resistor (R<sub>L</sub>)
 [[File:Figure 2. The ethanol in the flask is heated by the hotplate. The ethanol vapour travels through the tubing to the Figaro TGS 2620 sensor.jpg|600px|thumb|left|Figure 2. The ethanol in the flask is heated by the hotplate. The ethanol vapour travels through the tubing to the Figaro TGS 2620 sensor]]

@@ Line 15: / Line 15: @@
 The sensing element inside the Figaro sensor is comprised of a metal oxide semiconductor layer formed on an alumina substrate of a sensing chip together with an integrated heater. In the presence of a detectable gas, the sensor's conductivity increases depending on the gas concentration in the air.  The gas sensor cable from eDAQ can convert the change in conductivity to an output signal which corresponds to the gas concentration. This signal is record by the e-corder.
-The sensor requires two voltage inputs, which are supplied by the e-corder: the heater voltage (V<sub>H</sub>) and the circuit voltage (V<sub>C</sub>).  The heater voltage is applied to the integrated heater in order to maintain the sensing element at a specific temperature which is optimal for sensing.  Circuit voltage is applied to allow measurement of voltage (V<sub>RL</sub>) across a load resistor (R<sub>L</sub>) which is connected in series with the sensor.
+The sensor requires two voltage inputs, which are supplied by the e-corder: the heater voltage and the circuit voltage.  The heater voltage is applied to the integrated heater in order to maintain the sensing element at a specific temperature which is optimal for sensing.  Circuit voltage is applied to allow measurement of voltage across a load resistor which is connected in series with the sensor.
 The Arithmetic calculation function in the Chart software is used convert measured voltage to sensor resistance. For example, for the TGS 2620 ethanol sensor, Equation 1 is used.

@@ Line 12: / Line 12: @@
 * A gas sensor from [http://www.figarosensor.com Figaro Engineering]
-== Setup ==
+=== Experimental Setup ===
 The sensing element inside the Figaro sensor is comprised of a metal oxide semiconductor layer formed on an alumina substrate of a sensing chip together with an integrated heater. In the presence of a detectable gas, the sensor's conductivity increases depending on the gas concentration in the air.  The gas sensor cable from eDAQ can convert the change in conductivity to an output signal which corresponds to the gas concentration. This signal is record by the e-corder.
 The sensor requires two voltage inputs, which are supplied by the e-corder: the heater voltage (V<sub>H</sub>) and the circuit voltage (V<sub>C</sub>).  The heater voltage is applied to the integrated heater in order to maintain the sensing element at a specific temperature which is optimal for sensing.  Circuit voltage is applied to allow measurement of voltage (V<sub>RL</sub>) across a load resistor (R<sub>L</sub>) which is connected in series with the sensor.
-The Arithmetic calculation function in the Chart software is used convert measured voltage to sensor resistance, using Equation 1.
+The Arithmetic calculation function in the Chart software is used convert measured voltage to sensor resistance. For example, for the TGS 2620 ethanol sensor, Equation 1 is used.
           <math>R_s = \tfrac{V_C - V_{RL}}{V_{RL}} \times R_L</math>          Equation 1.

@@ Line 17: / Line 17: @@
 The sensor requires two voltage inputs, which are supplied by the e-corder: the heater voltage (V<sub>H</sub>) and the circuit voltage (V<sub>C</sub>).  The heater voltage is applied to the integrated heater in order to maintain the sensing element at a specific temperature which is optimal for sensing.  Circuit voltage is applied to allow measurement of voltage (V<sub>RL</sub>) across a load resistor (R<sub>L</sub>) which is connected in series with the sensor.
-The Arithmetic calculation function in the Chart software is used convert measured voltage (V<sub>RL</sub>) to sensor resistance (R<sub>s</sub>), using Equation 1.
+The Arithmetic calculation function in the Chart software is used convert measured voltage to sensor resistance, using Equation 1.
           <math>R_s = \tfrac{V_C - V_{RL}}{V_{RL}} \times R_L</math>          Equation 1.

@@ Line 22: / Line 22: @@
 where sensor resistance (R<sub>s</sub>), circuit voltage (V<sub>C</sub>), measured voltage (V<sub>RL</sub>) and load resistor (R<sub>L</sub>)
 When the ambient temperature and humidity is taken into account, the Sensor resistance can be converted to the concentration of the gas.
 [[File:Figure 2. The ethanol in the flask is heated by the hotplate. The ethanol vapour travels through the tubing to the Figaro TGS 2620 sensor.jpg|600px|thumb|left|Figure 2. The ethanol in the flask is heated by the hotplate. The ethanol vapour travels through the tubing to the Figaro TGS 2620 sensor]]