液氨泄漏检测探头NE-NH3氨气气体传感器

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液氨泄漏检测探头NE-NH3氨气气体传感器

Technical Information Electrochemical Ammonia Gas Sensor NE-NH3 series (NE-NH3, NE-NH3-1000, NE-NH3-5000) For Industrial Application

Electrochemical Ammonia Gas Sensor

(NE-NH3, NE-NH3-1000, NE-NH3-5000)

For Industrial Application

深圳市深国安电子科技有限公司地址：广东省深圳市龙华新区牛栏前大厦Ｃ５０７　　　蒋小姐：１３４　２８７６　２６３１　　　　　　　电话：８６　７５５－８５２５８９００网址：ｗｗｗ．ｓｉｎｇｏａｎ．ｃｏｍ　　ｗｗｗ．ｓｉｎｇｏａｎ．ｃｏｍ．ｃｎ　　ｗｗｗ．ｓｈｅｎｇｕｏａｎ．ｃｏｍ

Technical Information Electrochemical Ammonia Gas Sensor NE-NH3 series (NE-NH3, NE-NH3-1000, NE-NH3-5000) For Industrial Application

1. General

Nemoto NE series sensors were developed for industrial applications, and NE-NH3, NE-NH3-1000 and NE-NH3-5000 are available for ammonia gas sensor. Shape and pin positions are compatible with others, however the stability, repeatability, durability and reliability are quite superior to others, additionally the price is competitive with others. Features and applications are as follows.

2. Detection principle

Electrochemical sensor consists of working electrode on which oxidization takes place, counter electrode on which reduction takes place, and reference electrode which can monitor and keep the voltage at constant. Structure of electrochemical sensor NE-NH3 is shown in the following figure, ammonia gas diffuses through membrane into working electrode, and decomposes and is partially oxidized, and consequently, nitrogen is generated at working electrode. Subsequently generated proton at this reaction proceeds to counter electrode, and reacts with dissolved oxygen in electrolyte to water. Total reaction is in the below described. Ammonia gas concentrations is proportional to the current that is generated by this serial reaction.

3. Features

EQuick response

EExcellent selectivity

EGood linearity and stability

EHigh reliability

EExcellent durability against high temperature and humidity

4. Detected gas

Ammonia

5. Application

ENH3 gas densitometer for industrial application

ENH3 gas alarm for industrial equipment

EHandheld type NH3 gas leakage checker

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深圳市深国安电子科技有限公司地址：广东省深圳市龙华新区牛栏前大厦Ｃ５０７　　　

蒋小姐：１３４　２８７６　２６３１　　　　　　　电话：８６　７５５－８５２５８９００网址：ｗｗｗ．ｓｉｎｇｏａｎ．ｃｏｍ　　ｗｗｗ．ｓｉｎｇｏａｎ．ｃｏｍ．ｃｎ　　ｗｗｗ．ｓｈｅｎｇｕｏａｎ．ｃｏｍ

Technical Information Electrochemical Ammonia Gas Sensor NE-NH3 series (NE-NH3, NE-NH3-1000, NE-NH3-5000) For Industrial Application

6. Dimensions and appearance

Case Material

Cap Color

Weight PPO Purple 5 g (approx.)

Fig.1 Appearance and dimensions of NE-NH3

(Other NH3 series are the same as the above.)

7. Ratings

1) Ambient temperature and Temperature : -30 - +50 degree C humidity in operation Humidity : 15 – 90%RH 2) Recommended ambient temperature Temperature : 0 – 20 degree C and humidity in storage Humidity : 15 – 90%RH – 1.1 atm

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3) Operating pressure range 0.9

深圳市深国安电子科技有限公司地址：广东省深圳市龙华新区牛栏前大厦Ｃ５０７　　　

Technical Information Electrochemical Ammonia Gas Sensor NE-NH3 series (NE-NH3, NE-NH3-1000, NE-NH3-5000) For Industrial Application

4) Detection range 5) Recommended load resistor 10 ohm 8. Specifications 1) Output signal NE-NH3 (Standard type) 40 +/- 12nA/ppm.NH3 at 20 degree C NE-NH3-1000 8 +/- 4nA/ppm.NH3 at 20 degree C NE-NH3-5000 4 +/- 2nA/ppm.NH3 at 20 degree C 2) Response time (T90) NE-NH3 Less than 90sec. NE-NH3-1000 Less than 120sec. NE-NH3-5000 Less than 150sec. 3) Repeatability in the same day Less than +/- 10% 4) Annual zero offset drift NE-NH3 Less than 10ppm of ammonia NE-NH3-1000 Less than 50ppm of ammonia NE-NH3-5000 Less than 100ppm of ammonia 5) Zero offset temperature dependence (-30 - +50degree C) NE-NH3 Less than 15ppm of ammonia NE-NH3-1000 Less than 75ppm of ammonia NE-NH3-5000 Less than 150ppm of ammonia

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6) Sensitivity reduction in long term

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Less than 2%/month

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7) Expected

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lifetime

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24 months storage time

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Less than 6 months 8)

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Recommended 9.

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Electrical properties 9-1. Typical Gas

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Sensitivity

深圳市深国安电子科技有限公司 Fig.2 : Gas Sensitivity of NE-NH3 series 地址：广东省深圳市龙华新区牛栏前大厦Ｃ５０７　　　

Technical Information Electrochemical Ammonia Gas Sensor NE-NH3 series (NE-NH3, NE-NH3-1000, NE-NH3-5000) For Industrial Application

市龙华新区牛栏前大厦Ｃ５０７　　　蒋小姐：１３４　２８７６　２６３１　　　　　　　电话：８６　７５５－８５２５８９００网址：ｗｗｗ．ｓｉｎｇｏａｎ．ｃｏｍ　　ｗｗｗ．ｓｉｎｇｏａｎ．ｃｏｍ．ｃｎ　　ｗｗｗ．ｓｈｅｎｇｕｏａｎ．ｃｏｍ 11. Recommended circuit diagram Recommended circuit diagram for evaluation of NE-NH3 is shown in figure 10. In this circuit diagram, OP97 as operational amplifier is employed. If you want to use another operational amplifier, please contact to us. We would like to provide the information of operational amplifier according to your demands. And thermistor is employed, resistance value of 10Kohm at 25 degree C and around 3500 as B constant is recommended. Ishizuka thermistor is not pointed, and another one is also available. 0.1?Ê F -Vcc 0.1?Ê F ?m?s?|?m?g ?R C R W 25.5k?¶ 13.7k?¶ +Vcc 10k?¶ 4 2 6 3 8 OP97 7 ?s?g non. 1 0.1?Ê F -Vcc 0.1?Ê F 10?Ê F 10?¶ 2 6 3 Output Voltage OP97 4 7 1 8 10?¶ 0.1?Ê F +Vcc TH : NTC Thermistor R = 10k?¶ B = 3435k 103AT(Ishizuka Electronic Corp.) 25 Fig. 10 : Measuring circuit diagram for evaluation 12. Notice on handling 12-1. Seasonal variation of sensitivity Highly hygroscopic electrolyte is normally employed for electrochemical sensor, and then the sensitivity varies according to change of temperature and humidity, i.e. sensitivity is little lower in high humidity than in low humidity in case of NE-NH3. Since it is because of amount of electrolyte, this seasonal variation of sensitivity should be taken into account in case that precise measurement is necessary. However, this variation is reversible phenomenon. 12-2. Design of gas alarm or gas densitometer a. Calibration of gas alarm or gas densitometer is to be carried out in clean air after the output was stabilized. b. Gas sensitivity reduction ratio of 2% per month is to be taken into account at designing of gas alarm as recommendation. In case that precise detection is required, periodical calibration is recommended. c. In case that water drop or oil is on the pre-filter, accurate measurement may not be available because of low diffusion of detected gas to sensor. If such accident may be conceived, design of prevention from such one is to be considered. d. Warranty time is 1 year in case of being used in normal circumstance. 深圳市深国安电子科技有限公司地址：广东省深圳市龙华新区牛栏前大厦Ｃ５０７　　　蒋小姐：１３４　２８７６　２６３１　　　　　　　电话：８６　７５５－８５２５８９００网址：ｗｗｗ．ｓｉｎｇｏａｎ．ｃｏｍ　　ｗｗｗ．ｓｉｎｇｏａｎ．ｃｏｍ．ｃｎ　　ｗｗｗ．ｓｈｅｎｇｕｏａｎ．ｃｏｍ 12-3. Storage of sensor It is recommended that electrochemical sensor should be stored in normal temperature and humidity,