Multiple location negative air pressure monitor

• US 4,865,634 A
• Filed: 02/21/1989
• Issued: 09/12/1989
• Est. Priority Date: 02/21/1989
• Status: Expired due to Fees

• Current Assignee: Steven C. Griffis
• Original Assignee: Steven C. Griffis
• Inventors: Griffis, Steven C.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/312,819
• Time in Patent Office: 203 Days
• Field of Search: 55/21, 55/213, 55/270, 55/274, 73/714, 73/716, 73/717, 73/756, 340/626
• US Class Current: 96/418
• CPC Class Codes: B01D 2279/51 in clean rooms, e.g. production facilities for electronic devices, laboratories
• CPC Class Codes: B01D 46/0086 Filter condition indicators

Abstract

A multiple location negative air pressure monitor is provided which enables the air pressure within a work space to be monitored at various locations throughout the work space so that the site operator is assured that the proper negative air pressure is maintained throughout the work area.

Claims

1. In combination,

an enclosed work area in which an asbestos abatement action is taking place,

at least one air filtration unit having an intake end, a discharge end, and means for pulling air therethrough, the intake end of said air filtration unit being in operative communication with the interior of said work area for creating a negative air pressure within said work area,

a multiple location negative air pressure monitor located remotely of said work area, said monitor comprising a housing means having a display panel means,

a plurality of pressure differential sensing devices in said housing means,

each of said sensing devices having low pressure and high pressure sides,

an elongated tube operatively connected to and extending from the low pressure side of each of said sensing devices, the distal ends of said tubes being positioned in spaced-apart locations within said work area,

an elongated tube operatively connected to and extending from the high pressure side of each of said sensing devices, the distal ends of said tubes being in communication with the atmosphere outside of said work area,

and an indicator means operatively connected to said sensing devices for indicating the absence of the desired negative air pressure at one or more of the distal ends of the tubes positioned in said work area.

2. The combination of claim 1 wherein a plurality of digital displays are provided on said display panel means for displaying the air pressure at each of the distal ends of each of the tubes located in said work area.

3. The combination of claim 1 wherein said indicator means includes a visual signal means and an audible alarm means.

4. The combination of claim 1 wherein said digital displays are operatively connected to data recorders.