Constant Volume Air Sampler for Precise Microbial Monitoring
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Summary
Problems
Existing air samplers fail to maintain a consistent volume flow rate across varying ambient pressures and temperatures, leading to inaccurate microbial monitoring in environments like clean rooms and pharmaceutical processing.
Innovation solutions
A differential pressure volume flow air sampler that uses a processor to calculate and regulate air flow based on differential pressure, ambient pressure, and temperature signals, employing a blower and a removable head with encoded flow coefficients to maintain a constant volume flow through the system.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If existing air samplers are used without differential pressure and temperature compensation, then the device complexity is low, but the measurement precision of volume flow rate deteriorates under varying ambient conditions
Why choose this principle:
The system continuously monitors differential pressure and temperature, feeds this information to a processor that calculates the actual volume flow rate, and uses this feedback to maintain accurate measurements despite changing ambient conditions. The processor applies the equation Qdot=C*[dP*T/Pa]^0.5 to compensate for environmental variations.
Principle concept:
If existing air samplers are used without differential pressure and temperature compensation, then the device complexity is low, but the measurement precision of volume flow rate deteriorates under varying ambient conditions
Why choose this principle:
The system changes the operating parameters by actively monitoring and adjusting for differential pressure and temperature variations. By measuring these parameters and incorporating them into the flow calculation equation, the system compensates for environmental changes that would otherwise affect measurement accuracy.
Application Domain
Data Source
AI summary:
A differential pressure volume flow air sampler that uses a processor to calculate and regulate air flow based on differential pressure, ambient pressure, and temperature signals, employing a blower and a removable head with encoded flow coefficients to maintain a constant volume flow through the system.
Abstract
Disclosed is a differential pressure volume flow air sampler that measures temperature in a collection cavity, differential pressure between the measured ambient pressure and air pressure in a collection cavity. These parameters are used to calculate the volume air flow across a collection disk using a processor which adjusts a blower to maintain a substantially constant volume air flow through said air sampler from the surrounding atmosphere.