{"id":5142,"date":"2020-08-10T04:50:35","date_gmt":"2020-08-10T04:50:35","guid":{"rendered":"https:\/\/palas-china.com.cn\/en\/?post_type=product&p=5142"},"modified":"2025-01-20T12:23:47","modified_gmt":"2025-01-20T04:23:47","slug":"welas-digital-3000","status":"publish","type":"product","link":"https:\/\/palas.com.cn\/en\/product\/welas-digital-3000\/","title":{"rendered":"welas\u00ae digital 3000"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]The\u00a0welas\u00ae\u00a0<\/sup>digital 3000<\/b>\u00a0is a flexible, powerful and economical light-scattering spectrometer system with two aerosol sensors, which determines particle concentration and size precisely and reliably.<\/p>\n

Unique are up to four measuring ranges in only one device:
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a00.2 \u00b5m \u2013 10 \u00b5m
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a00.3 \u00b5m \u2013 17 \u00b5m
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a00.6 \u00b5m \u2013 40 \u00b5m
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a02 \u00b5m \u2013 100 \u00b5m (additionally for sensors 2300 and 2500).<\/p>\n

welas\u00ae<\/sup>\u00a0digital 3000 is famous for up to 128 size channels per measuring range and a concentration range from < 1 particle\/cm3<\/sup>\u00a0to 106<\/sup>\u00a0particles\/cm3<\/sup>.<\/p>\n

On the new welas\u00ae\u00a0<\/sup>digital 3000, two welas\u00ae\u00a0<\/sup>sensors are supplied with one light source and the scattered light pulses are detected by a photomultiplier. This enables a quasi-simultaneous particle measurement at two sampling locations that are up to 100 meters apart.<\/p>\n

The quasi-simultaneous particle size and particle quantitative determination offers particular advantages for characterising separators with fluctuating raw gas concentrations.<\/b><\/p>\n

With the welas\u00ae\u00a0<\/sup>digital 3000 the user effectively has two scattered-light spectrometers in one device with the same device characteristics:
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a0Particle size resolution capability
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a0Particle size classification accuracy
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a0Counting efficiency
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a0Zero counting rate<\/p>\n

The various welas\u00ae\u00a0<\/sup>sensors are characterized by a particularly good conformity of counting efficiency and particle size resolution (see data sheet: welas\u00ae\u00a0<\/sup>sensors).<\/p>\n

Opto-mechanical switching<\/b><\/p>\n

Using opto-mechanical switching, the two sensors that are connected can be easily controlled. The sensors are controlled automatically with the software.<\/p>\n

The particular advantage over a manual measurement selector switch:
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a0Faster change of the measurement location
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a0No deposits in sampling lines
\n\u2022<\/span>\u00a0\u00a0\u00a0\u00a0Long service life; no wear of the seals due to dust particles<\/p>\n

The\u00a0welas\u00ae\u00a0<\/sup>digital 3000<\/b>\u00a0is characterized by its optical fibre technology. The welas\u00ae<\/sup>\u00a0sensor is connected via a fiber optic cable with a length up to 30 m with the welas\u00ae\u00a0<\/sup>digital control unit.<\/p>\n

This leads to a minimization of particle losses in long sampling lines by simply installing the sensor directly at the sampling location.<\/p>\n

Connection via fiber-optic cable allows the welas\u00ae\u00a0<\/sup>2000 and 2000 P series sensors to be easily connected to the control and evaluation unit and interchanged as required.<\/p>\n

The welas\u00ae\u00a0<\/sup>sensors are equipped with different sized measurement volumes. This allows adaptation of the measuring device to the particle concentration present in the application, such that a high counting rate can be achieved with a short measuring time.<\/p>\n

The aerosol sensors allow reliable measurement in the concentration range from < 1 particle\/cm3<\/sup>\u00a0up to 106<\/sup>\u00a0particles\/cm3<\/sup>.<\/p>\n

The welas\u00ae\u00a0<\/sup>digital is based on scattered-light analysis on a single particle. With the new welas\u00ae\u00a0<\/sup>digital, the special advantages of the well-known and internationally acclaimed welas\u00ae<\/sup>\u00a0system are combined with new and fast digital individual signal processing and coincidence correction is enabled.<\/p>\n

The high size classification accuracy and the high size resolution are guaranteed by the following special feature (see Graph 1):
\n<\/b>\u2022<\/span>\u00a0\u00a0\u00a0\u00a0White light and 90\u00b0 light-scattering detection
\n\u21d2 Unambiguous calibration curve
\n<\/b>\u2022<\/span>\u00a0\u00a0\u00a0\u00a0Patented T-aperture
\n\u21d2 No border zone error
\n<\/b>\u2022<\/span>\u00a0\u00a0\u00a0\u00a0New digital individual signal processing
\n\u21d2 Coincidence detection and correction of the individual signal making it possible to measure in higher concentrations<\/b><\/p>\n

The welas<\/b>\u00ae\u00a0<\/sup>digital measurement technology<\/b><\/p>\n

welas\u00ae\u00a0<\/sup>digital offers a new, fast 20 MHz signal processing processor, which analyses the progression of each particle signal. This makes it possible to recognise coincidental events in light scattering measurement technology at the individual signal and correct them (according to Dr. Umhauer \/ Prof. Dr. Sachweh).<\/p>\n

This way it is possible to increase the maximum concentration limit up to 106<\/sup>\u00a0particles\/cm3<\/sup>\u00a0(welas\u00ae\u00a0<\/sup>2070 sensor).<\/p>\n

Also in low concentrations < 1 particle\/cm3<\/sup>\u00a0with the welas\u00ae<\/sup>\u00a0 2500 sensor, this leads to a higher measuring accuracy.<\/p>\n

High classification accuracy, high resolution capability and a high counting efficiency are the prerequisite for unambiguous particle measurement.<\/b><\/p>\n

\"\"
\nFig. 1: Resolution capability and classification accuracy<\/p>\n

The welas\u00ae\u00a0<\/sup>digital is characterized by its very high counting efficiency starting from 0.2 \u00b5m!<\/p>\n

\"\"
\nFig. 2: Example with sensor<\/p>\n

The welas<\/b>\u00ae\u00a0<\/sup>PDControl digital software<\/b><\/p>\n

The welas\u00ae\u00a0<\/sup>digital is controlled via a laptop using the PDControl software. The software allows particle measurements and calibration of the measurement device.<\/p>\n

In addition, the measurements can be analyzed and compared in detail with a temporal resolution down to 10 ms.<\/p>\n

The welas\u00ae\u00a0<\/sup>digital filter test software FTControl<\/b><\/p>\n

The FTControl software is used to flexibly program defined switching times between the two sensors. The measurement data are saved to a file and can be individually evaluated and compared in terms of particle size and concentration, as well as the fractional separation efficiency.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"

Aerosol spectrometer\u00a0with two aerosol sensors<\/strong>, highest particle size resolution, measuring range from 200 nm to 100 \u00b5m for\u00a0quasi simultaniously measurements<\/strong><\/p>\n","protected":false},"featured_media":5301,"template":"","meta":[],"_links":{"self":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/product\/5142"}],"collection":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/media\/5301"}],"wp:attachment":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/media?parent=5142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}