New Respirable Dust Curve
Cut-away drawing of BGI4 Cyclone
Applications
For more than 25 years the respirable dust cyclone has been an important adjunct to personal sampling in all of the dusty trades. In many instances this type of sampling is mandated by federal regulations on a routine basis, for each employee exposed. In all dusty applications, respirable dust samplers should be utilized to guard against excessive exposure, minimizing both worker risk and potential litigation/fines.Historical
In America we have typically utilized a non-conducting plastic cyclone and 37mm disposable cassettes while conforming (approximately) to the ACGIH Respirable Dust Curve1. (D50=3.5mm). The flow rate was 1.7 lpm. In the U.K. and Europe a metal cyclone was used (Simpends 70)2, which conformed to the Johannesberg Conference Curve3 (D50=5mm). The flow rate was 1.9 lpm. This U.K.-developed instrument conformed to the respirable curve very well and was not affected by non-conducting dust and static charge effects as was the American unit. Recently, the U.S., U.K., and Europe, have agreed on the Soderholm respirable dust curve, with a 50% cut at 4 micrometers. (D50=4mm).4,5New Design
BGI has combined the best features of the preceding instruments to develop the BGI4CP Respirable Dust Cyclone. The new unit is constructed of metal and conducting plastic. The cyclone body is fabricated from conducting plastic which preserves the very fine tolerances required of a device of this type. The dust cup (grit pot) is fabricated from a nonreactive elastomer and is held to the cyclone body with an integrally molded "O" ring seal. Filtration is accomplished with a 37mm disposable cassette, which is pressed on over the "O" ring seal.Cassette security is maintained by the spring steel lapel clip which prevents accidental dislodgment of the cassette and provides a secure, tangle free mounting for the suction hose.
This instrument has a recommended flow rate of 2.2 lpm to match the new 4mm, 50% cut, respirable curve5 and is not sensitive to charge effects6-7. The new high flow rate confers an immediate advantage in sensitivity since existing American units sample 23% less air per minute.
| Specifications -- BGI4CP | |
| Dimensions | (O/A) |
| Height | 3.9 in (10 cm) |
| Width | 2 in (5 cm) |
| Depth | 1.7 in (4.3 cm) |
| Weight (BGI4) | 4 oz (117 g) |
| Weight (BGI4CP) | 2.65 oz (75 g) |
| Length of suction hose | 28 in (70 cm) |
| Materials of construction |
Cyclone body: Conducting Acetal Plastic Dust cup: Soft Elastomer Cassette Adaptor: Aluminum |
|
Ordering Information Click on a part number to add that item to your Price Quote List. | |
| BGI4CP | Respirable Dust Cyclone |
| CAS4 | Respirable Dust Cyclone (Conducting Plastic) |
| CAS5 | 25 mm Reusable Cassette |
| CAS6 | 37 mm Reusable Cassette |
| CAS7 | Gasket for BGI4 |
| CAS8 | Gasket for BGI4CP and CAS4 |
| CAS9 | Screws (4) for BGI4 |
| CAS10 | Screws (4) for BGI4CP and CAS4 |
|
Replacement Parts | |
| BGI4.2 | Replacement Grit Pot (BGI4) |
| BGI4.3 | "O" Rings for Grit Pot 6/pkg. (BGI4) |
| BGI4.4 | "O" Rings for Cassette Fitting 6/pkg. |
| BGI4.5 | Replacement Tubing - Complete set includes: long tube, short tube, liner spring, connector tube and luer cassette adaptor. |
| AFC5 | Luer adaptor (20/pkg.) |
| GK2 | Grit Pot |
| GK3 | Replacement tubing for Luer adaptor |
| Replacement Parts for BGI4CP ONLY | |
| BGI4.2CP | Grit Pot |
| Filters & Cassettes (Millipore) | |
| AAWPO37OO | 37mm, 0.8 micrometer MCE filters, 100/pkg. |
| MOOOO37 | 37mm, Empty cassettes 50/pkg. |
| MAWPO37AO | 37mm, 0.8 micrometer MCE 3piece cassettes, 50/pkg. |
| MAWPO37AM | 37mm, 0.8 micrometer MCE Matched Weight, 3 piece cassettes, 50/pkg. |
Complies with ACGIH Criteria for Respirable Dust Sampling
- American Conference of Governmental Industrial Hygienists (1964) Particle Size
Selective Sampling in the Workplace. Pub. No. 0830 ACGIH, Cincinnati, OH.
- Higgins, R.J. and Dewell, P (1967) A Gravimetric Size Selecting Personal Dust
Sampler. "Inhaled Particles and Vapors II". (Ed. by Davies, C.N.) pp 575-586.
Pergamon Press. Oxford.
- Hamilton, R.L.J. and Walton, W.H. (1961) The Selective Sampling of Respirable Dust.
"Inhaled Particles and Vapors". (Ed. by Davies, C.N.) pp 465-475. Pergamon Press,
Oxford.
- American Conference of Governmental Industrial Hygienists (1991-1992) Threshold
Limit Values. p 42, ACGIH, Cincinnati, OH.
- American Conference of Governmental Industrial Hygienists NOTICE OF INTENDED CHANGE
- Appendix D - Particle Size - Selective Sampling Criteria of Airborne Particulate
Matter. "Appl. Occup. Environ. Hygiene 6(9) 1991".
- D.L. Bartley et al. Respirable Aerosol Sampler Performance Testing (1994), American
Industrial Hygiene Assoc. Journal (No. 11, Vol. 55).
- A.D. Maynard, THE DETERMINATION OF SAMPLING EFFICIENCY FOR THREE TYPES OF PERSONAL
CYCLONE, HSE Sheffield, Section Paper, Project No. R.42.58HPD, Phase 2, April 1993.