R S / R 100ppb 0.1. Fig. 1: R S /R 0 as a function of gas concentration at 50% RH and 25 C.

Transcription

1 MiCS-2610 O 3 Sensor This datasheet describes the use of the MiCS-2610 in ozone detection applications. The package and the mode of operation described in this document target the detection of the oxidising gas O 3 in indoor or outdoor environments. Ozone is a hazardous gas, which can cause respiratory problems at concentrations above 100 ppb. FEATURES Low heater current Wide detection range High sensitivity Fast thermal response Miniature dimensions High resistance to shocks and vibrations IMPORTANT PRECAUTIONS Read the following instructions carefully before using the MiCS-2610 sensor described in this document to avoid erroneous readings and to prevent the device from permanent damage. The sensor must not be wave soldered without protection, or exposed to high concentrations of organic solvents, ammonia, or silicone vapours, to avoid poisoning the sensitive layer. Heating powers above the maximum rating of 95 mw can destroy the sensor due to overheating. After exposing the sensor to high concentrations of O 3, make sure the sensor is given enough time to recover before taking new measurements. For any additional questions, enquiries@e2v.com or telephone +44 (0) OPERATING MODE The recommended mode of operation is a constant voltage mode. A heater power of P H = 80 mw is applied. This causes the temperature of the sensing resistor (R S ) to reach about 430 C. Detection of the O 3 concentration is achieved by measuring the sensing resistor R S during operation. SENSOR RESPONSE The sensor response to O 3 in air is represented in Fig. 1. The sensor resistance R S is normalised to the resistance R S / R 100ppb O 3 [ppb] under 100 ppb of O 3 (R 100ppb ). Fig. 1: R S /R 0 as a function of gas concentration at 50% RH and 25 C. Whilst e2v technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also reserves the right to change the specification of goods without notice. e2v technologies accepts no liability beyond the set out in its standard conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein. e2v technologies (uk) limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU United Kingdom Telephone: +44 (0) Facsimile: +44 (0) enquiries@e2v.com Internet: Holding Company: e2v technologies plc e2v technologies inc. 4 Westchester Plaza, PO Box 1482, Elmsford, NY USA Telephone: (914) Facsimile: (914) enquiries@e2vtechnologies.us e2v technologies (uk) limited 2008 A1A-MiCS-2610 Version 2, July

2 MEASUREMENT CIRCUIT Fig. 2 shows the pin connections of the MiCS-2610 ozone sensor. A simple circuit to measure the O 3 concentration is proposed in Fig. 3. The heating voltage V H is applied to pins 3 and 1. A load resistor R L is connected in series with R S to convert the resistance R S to a voltage V S between pins 2 and 4. R S can then be calculated by the following expression: R H Pin Connection 1 Heater ground 2 Sensor pin 3 Heater power 4 Sensor pin R S = R L /(V CC - V S ) x V S R S Fig. 2: Equivalent circuit of MiCS-2610 (top view) V H Gas Sensor R L V CC GND V S Fig. 3: Measurement circuit for O 3 detection ELECTRICAL SPECIFICATIONS Maximum Ratings Rating Symbol Value/ Range Unit Maximum sensor supply voltage V CC 5 V Maximum heater power dissipation (see note 1) P H 95 mw Maximum sensor power dissipation P S 1 mw Relative humidity range R H 5 95 %RH Ambient operating temperature T amb C Storage temperature range (see note 2) T sto C Storage humidity range RH sto 5 95 %RH Operating Conditions Parameter Symbol Typ Min Max Unit Heating power (see note 3) P H mw Heating voltage V H V Heating current I H ma Heating resistance (see note 4) R H Ω Sensitivity Characteristics Characteristic Symbol Typ Min Max Unit O 3 detection range FS ppb Sensing resistance in air R kω Sensitivity factor (see note 5) S R Notes: 1. Heating powers above 95 mw can cause permanent damage to the sensor due to overheating. 2. Storage of parts in original shipping package. 3. To ensure a correct operating temperature, the heater voltage should be ajusted so that the resulting heating power equals 80 mw. Lower heating power will reduce the sensitivity and increase the response time. Heating powers above 95 mw can cause permanent damage to the sensor due to overheating. 4. Heating resistor values from sensors out of production range between 58 and 78 Ω measured at V H = 2.35 V. Due to material properties of the heating resistor its value increases during operating life. 5. Sensitivity factor S R is defined as R S at 100 ppb of O 3 divided by R S at 50 ppb of O 3. Test conditions are 50 ± 5% RH and 25 ± 2 C. e2v technologies (uk) limited 2008 Document subject to disclaimer on page 1 A1A-MiCS-2610 Version 2, page 2

3 PACKAGE OUTLINE (All dimensions nominal and in millimetres) J A B C H I D K G F Ref. Min Max A B C D E F G H I J K e2v semiconductor gas sensors are well suited for leak detection and applications requiring limited accuracy. Their use for absolute gas concentration detection is more complicated because they typically require temperature compensation, calibration, and sometimes as well, humidity compensation. Their base resistance in clean air and their sensitivity can vary overtime depending on the environment they are in. This effect must be taken into account for any application development ( ). e2v technologies (uk) limited 2008 Document subject to disclaimer on page 1 A1A-MiCS-2610 Version 2, page 31

4 MiCS-2710 NO 2 Sensor This datasheet describes the use of the MiCS The package and the mode of operation illustrated in this document target the detection of nitrogen dioxide (NO 2 ). FEATURES Low heater current Wide detection range High sensitivity Fast thermal response Miniature dimensions High resistance to shocks and vibrations IMPORTANT PRECAUTIONS Read the following instructions carefully before using the MiCS-2710 sensor described in this document to avoid erroneous readings and to prevent the device from permanent damage. The sensor must not be wave soldered without protection, or exposed to high concentrations of organic solvents, ammonia, or silicone vapours, to avoid poisoning the sensitive layer. Heating powers above the maximum rating of 120 mw can destroy the sensor due to overheating. This sensor is to be placed in a filtered package that protects it against any water or dust projection. For any additional questions, enquiries@e2v.com or telephone +44 (0) OPERATING MODE The recommended mode of operation is a constant power mode. A heater power of P H = 43 mw is applied. This causes the temperature of the sensing resistor (R S ) to reach about 220 C. Detection of the pollution gases is achieved by measuring the sensing resistor R S during operation. SENSOR RESPONSE The sensor response to NO 2 in air is represented in Fig NO2 [ppm] The sensor resistance R S is normalised to the resistance under air (R 0 ). Fig. 1: R S /R 0 as a function of gas concentration at <5% RH and 25 C. Whilst e2v technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also reserves the right to change the specification of goods without notice. e2v technologies accepts no liability beyond the set out in its standard conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein. e2v technologies (uk) limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU United Kingdom Telephone: +44 (0) Facsimile: +44 (0) enquiries@e2v.com Internet: Holding Company: e2v technologies plc e2v technologies inc. 4 Westchester Plaza, PO Box 1482, Elmsford, NY USA Telephone: (914) Facsimile: (914) enquiries@e2vtechnologies.us e2v technologies (uk) limited 2008 A1A-MiCS-2710 Version 2, July

5 MEASUREMENT CIRCUIT Fig. 2 shows the pin connections of the MiCS-2710 gas sensor. A simple circuit to measure the pollution level is proposed in Fig. 3. The heating voltage V H is applied to pins 3 and 1. A load resistor R L is connected in series with R S to convert the resistance R S to a voltage V S between pins 2 and 4. R S can then be calculated by the following expression: R H Pin Connection 1 Heater ground 2 Sensor pin 3 Heater power 4 Sensor pin R S = R L /(V CC - V S ) x V S R S Fig. 2: Equivalent circuit of MiCS-2710 (top view) V H Gas Sensor R L V CC GND V S Fig. 3: Measurement circuit for pollution gas detection ELECTRICAL SPECIFICATIONS Maximum Ratings Rating Symbol Value/ Range Unit Maximum sensor supply voltage V CC 2.5 V Maximum heater power dissipation P H 50 mw Maximum sensor power dissipation P S 1 mw Relative humidity range R H 5 95 %RH Ambient operating temperature T amb C Storage temperature range T sto C Storage humidity range RH sto 5 95 %RH Operating Conditions Parameter Symbol Typ Min Max Unit Heating power P H mw Heating voltage V H V Heating current I H ma Heating resistance R H Ω Sensitivity Characteristics Characteristic Symbol Typ Min Max Unit NO 2 detection range FS ppm Sensing resistance in air (see note 1) Sensitivity factor (see note 2) Notes: R kω S R Sensing resistance in air (R 0 ) is measured under controlled ambient conditions, i.e. synthetic air at 23 ± 5 C and <5 ± 5% RH. 2. Sensitivity factor (S R ) is defined as R S at 0.25 ppm of NO 2 divided by R S in air. Test conditions are 23 ± 5 C and <5 ± 5% RH. e2v technologies (uk) limited 2008 Document subject to disclaimer on page 1 A1A-MiCS-2710 Version 2, page 2

6 PACKAGE AND FILTER OUTLINE (All dimensions nominal and in millimetres) J A B C H I K D G E F Ref. Min Max A B C D E F G H I J K Outline Notes: 1. A perfect pin alignment is not guaranteed. 2. The metallic mesh is optional. e2v semiconductor gas sensors are well suited for leak detection and applications requiring limited accuracy. Their use for absolute gas concentration detection is more complicated because they typically require temperature compensation, calibration, and sometimes as well, humidity compensation. Their base resistance in clean air and their sensitivity can vary overtime depending on the environment they are in. This effect must be taken into account for any application development ( ). e2v technologies (uk) limited 2008 Document subject to disclaimer on page 1 A1A-MiCS-2710 Version 2, page 3

7 PRODUCT INFORMATION Features: TGS for the detection of Carbon Monoxide * Battery operable * High repeatability/selectivity to CO * Linear relationship between CO gas concentration and sensor output * Simple calibration * Long life * UL recognized component * Meets UL2034, EN50291, and RoHS requirements Applications: * Residential and commercial CO detectors * CO monitors for industrial applications * Ventilation control for indoor parking garages * Recreational vehicle CO detectors * Marine CO detectors * Fire detection Figaro s TGS5042 is a battery operable electrochemical sensor which offer several advantages over traditional electrochemical sensors. Its electrolyte is environmentally friendly, it poses no risk of electrolyte leakage, can detect concentrations as high as 1% CO, operates in a range from -40 and +70 C, and it has lower sensitivity to interferant gases. With a long life, good long term stability, and high accuracy, this sensor is the ideal choice for CO detectors with digital display. OEM customers will find individual sensors data printed on each sensor in bar code from, enabling users to skip the costly gas calibration process and allowing for individual sensor tracking. TGS5042 utilizes a standard AA battery-sized package. The figure below represents typical sensitivity characteristics, all data having been gathered at standard test conditions (see reverse side of this sheet). The Y-axis shows theoutput current of the sensor (Iout/µA) in each gas. Output current is linear to CO concentration, with a deviation of less than ±5% in the range of 0~500ppm. Sensitivity Characteristics: The figure below represents typical temperature dependency characteristics. The Y-axis shows the sensor output ratio (I/Io) as defined below. The linear relationship between I/Io and CO concentration is constant regardless of the CO concentration range. I = Sensor output current in 400ppm of CO at various temperatures Io = Sensor output current in 400ppm at 20 C/50%RH Temperature Dependency: CO H2 Ethanol CH4 Iso-butane Gas concentration (ppm) Temperature ( C) IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY WITH EACH CUSTOMER S SPECIFIC APPLICATIONS. FIGARO STRONGLY RECOMMENDS CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO SENSORS IN YOUR APPLICATION AND, IN PARTICULAR, WHEN CUSTOMER S TARGET GASES ARE NOT LISTED HEREIN. FIGARO CANNOT ASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR APPLICATION FOR WHICH SENSOR HAS NOT BEEN SPECIFICALLY TESTED BY FIGARO.

8 Basic Measuring Circuit: C1 The diagram at the right shows the basic measuring circuit of TGS5042. The sensor generates a minute electric current which is converted into sensor output voltage (Vout) by an op-amp/resistor (R1) combination. Figaro recommends the following electrical parts: R1 : 1MΩ C1 : 1µF IC : AD708 NOTE: When voltage is applied to the sensor output terminal, the sensor may be damaged. Voltage applied to the sensor should be strictly limited to less than ±10mV. An additional resistor or FET is required to prevent polarization of the sensor when Vc is off. Working TGS5042 Counter - IC + 1µF R1 1MΩ Basic measuring circuit of TGS5042 Vout Specifications: Structure and Dimensions: Item Specification TGS5042-A00 TGS5042-B00 Model number Target gases Typical detection range TGS5042-A00 (pin version) TGS5042-B00 (ribbon version) Carbon monoxide 0 ~ 10,000ppm 0.8± ± ± ±0.05 Top view 4.0± ± ±1.0 Output current in CO 1.2~2.4nA/ppm 4.0±0.1 Baseline offset <±10ppm equivalent 90±4 Operating temperature Operating humidity Response time (T90) -10 C ~ +60 C (continuous) -40 C ~ +70 C (intermittent) 5 ~ 99%RH (no condensation) within 60 seconds ø8.5± ±0.25 Working electrode 0.20±0.12 Storage conditions Weight Standard test conditions -10 C ~ +60 C (continuous) -40 C ~ +70 C (intermittent) approx. 12g 20±2 C, 40±10%RH 50.2± ±1.0 Ribbon *1 (Ribbon thickness: 0.15 mmt) Side view Cutting point 49.7±1.0 (*) represents sensor output in air under operating conditions ø14.1±0.6 Insulation tube ø14.1±0.6 NOTE: When ordering, please be sure to specify the full model number, includng the suffix. 20.9±0.05 Counter electrode 7.5± ± ± ±0.05 Bottom view 4.0± ± ± ± ± ±4 unit: mm NOTE 1: When the sensor is shipped, the working electrode and counter electrode are connected (i.e. short circuited) by mounting on conductive mat (-A00) or a metal ribbon (-B00) in order to avoid polarization of the electrodes. To measure the sensor output, the sensor should be removed from, the mat (-A00) or the ribbon should be cut (-B00) and the sensor connected to a measuring circuit (see example above). The cutting point as indicated can be used to cut the ribbon easily. For information on warranty, please refer to Standard Terms and Conditions of Sale of Figaro USA Inc. REV: 03/13 FIGARO USA INC. 121 S. Wilke Rd. Suite 300 Arlington Heights, IL USA Tel: Fax: figarousa@figarosensor.com