Dosimeter having a low air flow rate

Patent · Tue Mar 24 04:00:00 EST 1981

OSTI ID:6201642

Wells, A J

An improved dosimeter having a low air flow rate for monitoring working areas in which air is pumped through the dosimeter at a controlled constant low rate of flow and any particles or vapors in the air are collected on a filter, a variable drive pump having an inlet and an outlet is connected to the filter and is driven by an electric motor and controlled by a feed back circuit of an integrator and an amplifier and the pump maintains a constant flow of air through the dosimeter; in operation of the dosimeter the integrator receives a signal from a pressure switch that detects changes in the flow of the air stream through the dosimeter by a change in a pressure drop of the air which is being pumped through an orifice; the improvement is the use of an adjustable by-pass valve connected in parallel with the variable drive pump in such a manner that regulated quantities of air from the outlet of the pump are recycled to the inlet of the pump thereby allowing the pump to provide a confer gases and the chosen metal dihalide vapor is ionized by ; the total economic market potential is 64.4% of the technical potential, or 2072.4 MW, equivalent to 83,621 BPDE; and the lack of an operating history-detailing system reliability, safety, and operating costs-iment and test components; technology testing; analytmperature fatigue stren obtained.

• Assignee: Du Pont De Nemours, E I and Co
• Patent Number(s): US 4257746
• OSTI ID: 6201642
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420600 -- Engineering-- Safety Engineering-- (-1987)
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR FLOW
AIR SAMPLERS
BYPASSES
CHEMICAL DOSEMETERS
COLLOIDS
CONTROL EQUIPMENT
DESIGN
DISPERSIONS
DOSEMETERS
EQUIPMENT
FILTERS
FLOW RATE
FLOW REGULATORS
FLUID FLOW
FLUIDS
GAS FLOW
GASES
LABORATORY EQUIPMENT
MEASURING INSTRUMENTS
PARTICLES
SAMPLERS
SOLS
VALVES
VAPORS