{"id":5440,"date":"2020-08-19T06:24:06","date_gmt":"2020-08-19T06:24:06","guid":{"rendered":"https:\/\/palas-china.com.cn\/en\/?post_type=product&p=5440"},"modified":"2025-01-20T12:04:40","modified_gmt":"2025-01-20T04:04:40","slug":"aerosol-sensor-welas-2500","status":"publish","type":"product","link":"https:\/\/palas.com.cn\/en\/product\/aerosol-sensor-welas-2500\/","title":{"rendered":"Aerosol sensor welas\u00ae 2500"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]The model 2500 aerosol sensors are equipped with a very small measurement volume and are used for coincidence-free measurement with a maximum number concentrations up to 4,000 particles\/cm3<\/sup>\u00a0. This aerosol sensor allows statistically reliable measurements in low raw gas concentrations down to clean room class 100,000 and for filter testing according to ASHRAE 52.2.<\/p>\n

Measuring range: 0.3 \u2013 17 \u00b5m \/ 0.6 \u2013 40 \u00b5m \/ 2 \u2013 105 \u00b5m.<\/p>\n

Functional principle:<\/b>
\nwelas\u00ae<\/sup>\u00a0digital and Promo\u00ae<\/sup>\u00a0digital are based on scattered-light analysis on a single particle. The particles to be measured pass through a T-shaped, optically delineated measuring volume that is illuminated by a white light source. This generates a scattered-light pulse whose level is a measure for the concentration.<\/p>\n

The high size classification accuracy and the high size resolution are guaranteed by the following special feature:
\n<\/b>\u2022<\/span>\u00a0\u00a0\u00a0\u00a0White light and 90\u00b0 light-scattering detection
\n\u2192\u00a0unambiguous calibration curve
\n<\/b>\u2022<\/span>\u00a0\u00a0\u00a0\u00a0Patented T-aperture technology for a T-shaped measurement technology
\n\u2192\u00a0no border zone error
\n<\/b>\u2022<\/span>\u00a0\u00a0\u00a0\u00a0New digital individual signal processing for the analysis of the scattered-light pulse
\n\u2192\u00a0coincidence detection and correction which enables measurement in up to 5 times higher concentrations<\/b><\/p>\n

Example: the welas\u00ae<\/sup>\u00a0sensor aerosol guide heatable up to 250\u00b0C (see variations)<\/b><\/p>\n

Trouble-free and reliable measurement of large particles up to 40 \u00b5m in the sensor is guaranteed by the vertical aerosol duct at a high volume flow of 5 l\/min and a large sampling tube diameter.<\/p>\n

\"\"
\nSize limitation of the optical measuring volume<\/b><\/p>\n

The table below shows the theoretical minimum separation of the particles at a given number concentration.
\nAt a number concentration of 103<\/sup>\u00a0per cm3<\/sup>\u00a0the optical measuring volume must not be larger than 1 mm3<\/sup>\u00a0.
\n\"\"
\nThe customer can select a sensor with the appropriate measuring volume size depending on the concentration to be measured.
\n\"\"<\/p>\n

For concentrations up to 1,000,000 particles\/cm3<\/sup>\u00a0the welas\u00ae<\/sup>\u00a02070 sensor with a small measuring volume is used. This ensures the smallest measuring volume such that only one particle ever enters the measuring volume. In low concentrations, the models with a larger measuring volume offers the advantage of a higher counting rate at the same number concentration.<\/p>\n

Agreement of the sensors<\/b>The welas\u00ae<\/sup>\u00a0sensors are characterized by a particularly good agreement of counting efficiency and particle size resolution.
\nThis means that the measurement results are highly comparable in terms of the number concentration and particle size measured when using different sensors.
\n\"\"
\nGraph 1: Counting efficiency of various sensors in relation to the welas\u00ae<\/sup>\u00a02200 sensor (in the measuring range 0.2 \u2013 10 \u00b5m)<\/p>\n

Pressure-resistant and heatable aerosol sensors with a special cuvette for the variants P, H and HP<\/b><\/p>\n

Special measuring cuvettes allow the use of the welas\u00ae<\/sup>\u00a0aerosol sensors even under unusual measuring conditions. These are available:<\/p>\n

\u2022<\/span>\u00a0\u00a0\u00a0heatable sensors up to 250\u00b0C; higher temperatures on request
\n\u2022<\/span>\u00a0\u00a0\u00a0pressure-resistant sensors up to 10 bar overpressure
\n\u2022<\/span>\u00a0\u00a0\u00a0sensor resistant against chemically aggressive media[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"

Aerosol sensor with optical fibre technology for number concentrations up to 4,000 particles\/cm3<\/sup><\/p>\n","protected":false},"featured_media":5459,"template":"","meta":[],"_links":{"self":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/product\/5440"}],"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\/5459"}],"wp:attachment":[{"href":"https:\/\/palas.com.cn\/en\/wp-json\/wp\/v2\/media?parent=5440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}