combustible gas detector with digital display

详情

I、Profile of combustible gas detector with smart voice digital display

Gas-detector handheld independent and combustible gas detector with the gas sensor
 of adopting Nemoto & Co., Ltd. ,and long service life, high sensitivity and high stability,
 meanwhile, it is the most advanced and smart handheld combustible gas detector in
the world:

1. Query function:

 A: agent query, including company name, telephone and fax

B: Query of alarm point

C: Query of alarm peak record, which can record up to 8 pieces of alarm information

2. Setting function:

 A: The alarm point can be set, meaning that users can set the current alarm point of alarm by press key.

     B: The gas concentration units can be set (KPPM or％LEL).

3. Super-smart voice function:

A: When the detector is in warm-up state, fault state, alarm state, product self-test state, product function test state, it can be expressed through the voice.

    B: If the fault of the detector can not be repaired, the detector will smartly tell the agent information to the master.

C: When the gas leak concentration reaches the set warning value, in addition to audible and visual alarm, the alarm also prompts through voice: “the gas is leaking。”

II Environmental requirements

  1. It is prohibited being used in the following environment:

     A: Sprayed insecticide (mosquitoes, cockroaches, etc.); and the ventilation time of air cleaner is less than one hour.

     B: The ventilation time of environment, including glue, paint and hair spray, is less than 4 hours.

     C: The environment contains hexamethyl disilazane; it is also called as silicon resin, which can poison the precious metal, and when its content in the air is less than 1/10000, the detector will completely lose the alarm function.

2. Consequences of illegal use:

A: If minor, it will cause alarm point drift, miss-alarming or omission alarming.

    B: If serious:① it will result in failure: the yellow light flashes and the buzzer beep calls.

               ② Detector end-of-life: when the gas is leaking, the alarm does not have any reaction.

III Appearance introduction:

1、 Digital tube screen:

(1). Red number: it shows the current concentration; from left to right, the display range concentration of unit is -9.9-99.9.

  (2). KPPM unit: when the KPPM subtitle lights, meaning that the current concentration unit of the detector is KPPM.

(3). %LEL unit: when the %LEL subtitle lights, meaning that the current concentration unit of the detector is %LEL.

2、 Indicator

 (1). Power light: green light, it is on in working state, and off in alarming or voice broadcast, and blinks 1/1s in warm-up state.

 (2). Alarming light: red light, it blinks 1/1s in alarming, and is off when the alarm stops.

 (3). Fault light: yellow light, it blinks in fault condition, scrolls with the red and green lights in self-test state and blinks with the red light in function-test state.

3、 Press key: In the alarming state, it is valid to press any keys.

 (1). K3 key: it is also called acting / alarming point key, short press of agent key; long press of setting key of alarming point.

  (2). K2 key: it is also called peak value / zero clearing key, short press of summit record queries; long press of displaying zero clearing. During the period of broadcasting peak value record, press K2 key shortly, turning forward to alarming peak value record, and press K1 key shortly, turning backward to alarming peak value record.

 (3). K1 key: it is also called self-test / concentration unit key, short-press means detector self-test; long press means concentration unit conversion.

  (4). P key: it is also called Power key; press P key for self-lock and connecting power, and then click to release P key; the power supply is automatically shut down.

IV Application

(1). Open the battery cover, install the battery and press P key to connect the power supply: if the speak sounds “tick”, all digital tube lit: ; after three seconds, the green light starts flashing, then the alarm is in warm-up state:  thus, the detector will automatically prompt the warm-up state:“it is normal warm-up; do not test the gas。”

(2). During the warming-up period, press any key, the detector will replay the voice prompts, but if press K3 key, the detector will increase the broadcast of agent voice:“the agent is ############# Company。”

(3). After warming up, the green light is on; the red digital tube shows the current concentration: 00.0, the detector enters normal monitoring state.

(4). Use and setting of detector functions:

① System self-test: In normal monitoring state, press K1 key shortly; the detector starts self-test; the green, yellow and red lights run in a cycle, then the three lights are off; the detector informs self-test results: “master, the system self-test is normal”, subsequently the detector enters normal monitoring state.

② Query of alarm peak record: there are totally 8 alarm peak records, in normal monitoring state, press K2 key shortly; the detector will query alarm peak record from back to forward and broadcast query results of peak value:

 “Alarm peak at # time” ,with the display on the screen, the query sequence is: 8,7,6, 5,4,3,2,1; if you want to check the peak record backward, you can press K1 key shortly; if you want to end the query, please wait for 5 seconds, the detector automatically returns to normal monitoring state, but you can also press K3 key shortly, after broadcasting agent voice, back to normal standby mode.

③ Agent query: in normal monitoring state, press K3 shortly and the detector will display query results:“The agent is ############# Company.”

④ Display of zero clearing: in normal monitoring state, press K2 key for a long time in recommended zero clearing before gas test; since the impacts of battery voltage change, temperature change and other factors will result in concentration display deviations.

⑤ Setting of concentration unit: in normal monitoring state, press K1 key for a long time and the concentration unit of KPPM and LEL will automatically exchange; after exchange, the detector will display the exchange result of concentration unit: “the current concentration unit is set as: KPPM (% LEL).

       At the same time, the KPPM (%LEL) subtitle showing concentration unit lights; when the set concentration unit changes, then for the concentration display and voice broadcast, the changed concentration unit shall prevail.

⑥  Setting of alarming point:

A: In normal monitoring state, press K3 key for a long time; after the speaker ticks for two times,“the detector broadcasts current alarm point”, with the display on the screen,then the detector enters the setting of alarm point: the last number of concentration display beating, press k2 key once with number increase of 1, cycling from 0-9, press K1, the cursor removes one cell; after completion of setting, press K3 to confirm and exit or the detector automatically confirms and exists; after this, the detector will display the setting results:“the alarm point is set,” with the display on the screen,

 B: If the alarm point is set too low; after warm-up, it has been in alarm state, then you can disconnect the power and then reconnect; in warm-up state, press K３ for along time, after the warm-up voice prompts, directly enter the alarm concentration setting, and the methods are as above.

 Note: conversion between concentration units: 1.0KPPM（CH4） = 2.0%LEL (CH4)

     The setting range of concentration unit: generally 0.5-9.9 KPPM (i.e. 1.0-19.8％ＬＥＬ), from the perspective of safety, if the set value of alarm value is greater than 6.0KPPM (i.e. 19.8%LEL), after 30 minutes, the detector will automatically turn the alarm point as 6KPPM (or 12%LEL)

(5). Zero clearing before gas test: since battery voltage change or temperature change and other environment factors result in display deviation of detector concentration. Therefore, before gas test, press K2 for about 2 seconds in the clean air, the detector ticks twice, indicating zero clearing is complete, and digital screen displays: 0.0 (ＫＰＰＭ or％LEL).

(6). Alarm state: if the test gas is leaking, the red digital tube of the detector displays the current gas concentration, when the concentration reaches the set alarm point, after the red light flashes and the green light is off, and the speaker gives out a harsh of sirens; the detector presents voice prompts: “the gas is leaking.” Only when the gas concentration is decreased below the alarm point, can the alarm gradually stop and return to normal monitoring state.

Note: During alarming period, do not turn on or turn off any electrical appliances to prevent has explosion caused by static electricity or sparks. (Only when the gas leak concentration reaches the explosive limit, could an explosion happen, the gas explosion limit is 53000PPM; and the explosive limit of liquefied gas LGP is 21000PPM.).

(7). Fault state: if the sensor of the detector has faults, the yellow light starts flashing, and the red number displays as :“Err”, the detector gives out “tick” sound and fault prompt voice during the gap:“The sensor is in fault; please contact the agent, and the agent is ############# Company”. During the fault period, the detector will increase the voice prompts once, when the fault disappears, the detector will tell in voice:“Master, the system self-test is normal”.

  (8). Low voltage state: when the battery voltage is too low, digital screen intermittently displays low voltage symbol: “-LO-”, and gives out “tick” sounds  and voice to remind the users of replacing the battery in a timely manner.

Ⅴ. Technical data

Suitable gas: Natural gas

Concentration alarm: 1-25%LEL   （500-12500PPM）

Alarm set: 0.5-9.9KPPM or 1.0-19.8%LEL

   Input power: 3.7V 2600MAH lithium battery

Static current:≤200mA  

Alarm current:≤500mA

Response time: ＜30 second

Alarm sound:＞80 decibel (From 1m)

Ⅵ. Emergency handling

   When the detector sends alarm signal:
1. Close all gas sources.

    2. Open the door and window immediately for air convection and natural exhaust

    3. At this time, it is strictly prohibited to ignite and open any electric products in case of explosion.

    4. If it cannot rule out the cause of the accident, please notify the gas company and ask them to send the gas professionals to exclude the leakage faults.

    5. If it is the quality problem of the alarm, please contact the agent to check.

      Note: The leakage of paint, cosmetics, alcohol and other chemical products may cause the detector to alarm, so these items should be far away from the detector to reduce false alarm.

Ⅶ. Failure analysis and troubleshooting