I. Summary
A smokemeter is a kind of instruments for measuring exhaust-smoke of diesel. For the time being there are two kinds of smoke measurement devices: light-extinction type and filter type. Although the test sample of filter of the Filter Type Smokemeter has a good visualization and is easily preserved, the surveying values can not directly and continuously read off and not be determined under the unstable working conditions such as acceleration, deceleration and so on; besides, the device only is able to survey the gas black but not the blue smoke and white smoke formed by oil fog or aqueous vapor in the diesel’s exhaust gases, any surveying datum being through a secondary transferring required and difficult of getting an accuracy; therefore, it is being gradually superseded by the Light-Extinction Smokemeter these days.
This Light-Extinction Smokemeter (with an another name of Light-Transmission Smokemeter ) disclosed herein can make a smoke measurement based on the decay degree of the light-quantity penetrated under steady or transitional working conditions, having the features as below:
(1) The device, a by-pass type smokemeter, can make a measurement of smoke when a diesel (automobile) is in acceleration or deceleration or at a stable speed.
(2) Digital displaying directly; can avoid man-made errors in reading.
(3) Built-in microprocessor; can calculate immediately technology data, display them on the front plate or write them by a printer in the device, and be equipped with the output interfaces (for analogic or digital signals) to connect with an external computer network.
(4) Self-diagnosing function; when the device is out of order, the trouble lamps concerned will be lightened and the code of the unit or element where an error occurred will be shown.
(5) Time function; some of time data such as year, month, day, date, hour, minute and second can be selected to display, in addition, year, month and date also can be printed while printing the measurement values in order to check and review after.
(6) Use a halogen-lamp as the light source, a selenium photocell as the detector, their optical performances are according with the requirements of GB3847-2005.
II.Main Technical Parameter
1. Test Scope：No light transmission N:：0～100% (equivalent to smoke value 0 ~ 10FSN) Light absorption coefficient K：0- 16 .06 m- 1
2. Resolution: 0. 1%
3. Shows the value error：≤ ± 2% (measured value)
4. Stability: ± 1%/h
5. Optical platform number:
Physical channel length: 244mm
Optical information length: 215mm
Inside diameter of sampling room: 20mm
Light alignment: 3°
Light source: Green LED565nm
Detector: Silicon photodiode
Response time (non-filtration mode): 20ms
6. Ambient temperature: -5-50 °C
7. Relative humidity: ≤ 95%
8. Supply voltage: AC 100-240V
9. Supply frequency: 50/60Hz
10. dimensions: control box : 240 ( d) x 310 (W) x 170 (H) mm
Flue box ( including bracket) : 130 ( d) x 400 (W) x 390 (H) mm
11. weight:control box : 4Kg Flue box : 5Kg