Measuring and testing – Sampler – sample handling – etc. – Automatic control
Patent
1990-03-16
1992-04-28
Noland, Tom
Measuring and testing
Sampler, sample handling, etc.
Automatic control
7386434, 364496, G01N 124
Patent
active
051077132
ABSTRACT:
A microprocessor controlled air sampling pump utilizes a PWM controlled DC electric motor for regulating air flow generated by a diaphragm-type air pump. The control system regulates air flow as a function of RPM of the motor by establishing a table of values which relate motor RPM to air flow rates. The control system maintains RPM at the desired value but includes a control loop which senses deviations in RPM and adjusts the PWM signals to the motor to regulate RPM. The system also senses large changes in RPM and treats such changes as blockages in the air sampling pump lines which prevent accurate environmental sampling. This system enters a cycling mode which turns the pump motor off for different time intervals until the detected blockage has been removed or until a predetermined time has expired. This procedure minimizes battery drain in the event of blockage of the air sampling pump lines. It also provides a method of accurately monitoring pump run time since it shuts off the pump during times in which the air flow is blocked.
REFERENCES:
patent: 4123932 (1978-11-01), Baker et al.
patent: 4241299 (1980-12-01), Bertone
patent: 4269059 (1981-05-01), Baker
patent: 4389903 (1983-06-01), Bertone et al.
patent: 4432248 (1984-02-01), Lalin
patent: 4527953 (1985-07-01), Baker et al.
patent: 4586367 (1986-05-01), Lewis
patent: 4860590 (1989-08-01), Buck
patent: 4893515 (1990-01-01), Uchida
Buck Albert P.
Motten Roger H.
Nash Timothy L.
Peck Richard W.
A.P. Buck, INc.
Beusse James H.
Noland Tom
LandOfFree
Air sampling pump does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Air sampling pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air sampling pump will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1239689