เครื่องมือตรวจแก็สรั่ว LPG/NGV
 (4/8/2549)

วันนี้ผมจะพาท่านมารู้จักปากกา และมิเตอร์วัดแก้สรั่ว หลังจากที่พวกเราและช่างตามอู่ใช้น้ำฟองสบู่ (บางทีผงซักฟอกที่ได้แถมมา) เอามาตรวจวัดแก้สรั่วตามข่อต่อท่อ และจุดเชื่อมต่อสายแก็ส บางครั้งมันก็ลึกเข้าไปเอื้อมลำบาก บางทีรถร้อนๆ ก็ทำไม่ได้ ลองมาใช้อุปกรณ์ตัวนี้ดูครับ ราคาไม่แพง เหมาะกับพกติดรถ โดยเฉพาะสภาพสตรี


หลักการทำงานของเครื่องตรวจแก๊สรั่วเป็น Pen Type Combustible Gas Detector This Product adopts catalytic gas sensor with low consumption and high sensitivity. It can be used in house, plant and any places with combustible gases. Once the concentration of LPG, natural gas reaches the preset alarming level, the gas detector will give a visual and audio alarming trustily to remind you take effective measurement to get rid of the danger and avoid fire, explode accident.
Technical Data
(1) Detecting gas: Flammable gas, such as methane, LPG, coal gas, alkane, alkyne, alkene, etc., liquid steam, such as alcohol, acetone, toluene, petrol, etc.
(2) Detecting Range: 0~100%LEL
(3) Sampling: Diffuse naturally
(4) Working Conditions: Tem: 0~40℃, Hum: <98%RH
(5) Working Voltage: DC3V (2pc 1.5VAA battery), Normal battery life:5 hours,
(6)Working Current: ≤170mA,Fault Alarming: ≤180mA
(7)Alarming level: Low: 20%LEL (can be set between 0-100%LEL freely), High: 50% LEL
(8)Alarming ways: Sound and visual alarming; Alarming: >40db
(9) Response time: <20s; Resume Time: <30s
(10) Dimension: Weight: about 190g (including battery), Size: Φ 183 X 18mm Products Hint

Operation Instruction
1. Open the back cover and cased the 1.5VAA batteries according to their polarity.
2. Turn switch to the top, the power LED will be on, green LED shows the normal voltage and the orange LED show the low voltage. The power LED will be always on during this detection.
3. After turn on the switch, there will be a 10 seconds for warm-up, then it gets into detection status. During detection If red LED flashes along with the buzzer sound discontinuously, shows the gas leakage being over the low alarming level; If the red LED keep lighting along with the buzzer sound continuously, shows gas leakage being over the high alarming level. Please take effective action to get rid of the danger.
4. When the black fault LED turns on, shows its gas sensor with fault itself. Faults and settlement

Notification
1. It’s possible that detector gave alarming if there is plenty smoke, alcohol or perfume etc. volatile matters in the room.
2. Don’t calibrate the detector with unknown concentration gas.
3. Don’t use or store the products on place with causticity gas, such as chlorine.
4. Please take the battery out if not use for a long time.
5. Please contact your local distributor for calibrating the detectors once a year. Fault Reason Settlement
Yellow LED on shows sensor fault Change the gas sensor
No response to detected gas
Fault LED not on shows circuit problem Contact factory or distributor for maintain
Low voltage Change the battery
Power LED turns orange
Possibly caused by the damaged circuit Contact factory or distributor for maintain
LED Information
Red LED flash
Gas leakage over the low
alarming level
1
Red LED
Gas leakage over the high
alarming level
2 Yellow LED Sensor fault
Green LED Power Indication
3
Orange LED Low power indication
1 、Alarm
2、Fault LED
3、Power LED
4、Switch
5、Handle
6、belt

Specifications Detecting gas: natural gas (methane), LPG (e-butane, propane), coal gas (hydrogen), alkynes, alkenes, etc., combustible gas. Alcohol, acetone, toluene, petrol, etc. Liquid steam.
Detecting Range: 0 100%LEL
Environment Temperature: 0 40
Environment Humidity: 98%RH
Working Voltage: DC3V 2 pc 1.5V AA battery
Working Time: 5 hours
Alarming Level: Low: 20%LELcan be specified High: 50%LEL
Response Time: <20s
Resume Time: <30s
Weight: About 150g including battery
Dimension: 183mm X 18mm
Shell Material: stainless steel





สำหรับรุ่นมืออาชีพอย่างอู่น่าจะมีเก็บไว้ใช้งาน คือรุ่นนี้ครับ


Gas sensor Type: solid semi-conductor gas sensor
Detecting Gas ฃบMethane, Natural gas, Ammonia, Hydrogen, Coal gas, Propane,Acetone, Gasoline,
Refrigerant, Ethanol Oxide, Sulfureted
Hydrogen, Lacquer, Diluent, Industrial impregnant, Alcohol, Gas Fuel ETC.
Gas sensitivity : <50ppm Methane variable
Startup Time : < 30 sec
Response Time : < 3 sec
Video Indication ฃบPower -Green LED indication,
Orange- Excessive Low power warning
Gas concentration alarming -- ten levels gas leakage volume LED indicating combustible gas
concentration,
Audio Indication: 0.5 - 1KHz, quicker buzzing frequency means higher gas concentration.
Power 9V Alkaline battery

Batteries Expectancy More than 8 hours continuous working
Size 170mm x 62mm x 26mm (L x W x H)
Weight 350g
Working Conditions -20 - 50 <98%RH No dews



Electricity circuit debugging :
Refers to the above circuit, Check all the assemblage, connecting the power supply, the “green” LED should light, When testing, the E1, E2 should be 9V, 5V separately. The pin8 of U1should be at low voltage (about 0.3v), There is a delay lasting about 5 minutes caused by the delay circuit with IC,U1:C shall prevent the false alarm at first connecting power supply, Introducing R14 of different resistance value or C3 (capacitance)of various capacitance can adjust the delay time. After about 5 minutes ,the delay ends, then the pin8 of U1:C should be at a high voltage (about 3.8V) .When detecting in clean air ,the both sides voltage (Vo) of R1 should be 0.2~1 V, otherwise should make the V0 fall into the above range through change R1 resistance value; Connecting the V0 to 100O to +5V (E2), adjust the resistance(RP) slightly, the “RED” LED should light accordingly. The Pin 7 of U1:B will become 3.8V from the 0.3V of static state., at the mean time .driving the buzzer to sound. If the component assemblage is correct, we can debug the above circuit, Take out the resistance between the E2 and V0, the debugging end.

Testing through Calibration gas
Preheating the gas leak alarm for 10 minutes, Making the calibrating gas concentration according to volume proportion, put the gas leak alarm in the calibrated gas. after 10 seconds ,the gas sensor sensing the gas adequately , then adjust the RP slightly to make buzzer sound exactly and RED LED light, the calibration will be completed after repeated it several times.

Installation
If the detected gas is LPG, Butane and propane which is heavier than normal air, Install the gas leak alarm about 1.00 meter above the ground, adversely, For the Natural gas, Methane, coal gas, CO and H2, which is lighter than the normal air, Install gas leak alarm about 1 meter below the roof, Both of them are should be with good air circulation.


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