Programmable fluid detector

• US 4,740,777 A
• Filed: 12/22/1986
• Issued: 04/26/1988
• Est. Priority Date: 12/22/1986
• Status: Expired due to Term

• Current Assignee: Emerson Electric Company
• Original Assignee: Emhart Industries, Inc. (Stanley Black & Decker, Inc.)
• Inventors: Slocum, Laurence S., Mussmann, Sara M.
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US06/944,216
• Time in Patent Office: 491 Days
• Field of Search: 340/522, 340/521, 340/517, 340/603-605, 340/620, 340/624, 73/40.5 R, 73/40, 73/40.7, 73/DIG. 8, 73/61.1 R, 73/61 R, 324/61 R, 324/61 P, 324/65 R, 324/65 P
• US Class Current: 340/522
• CPC Class Codes: G01M 3/16 using electric detection means G01M3/045, G01M3/06, G01M3/12, G01M3/20, G01M3/24, G01M3/26 take precedence
• CPC Class Codes: G08B 21/16 Combustible gas alarms

Abstract

A plurality of probes are electrically connected to a central controller. Each of the probes is capable of providing a hydrocarbon signal, a water signal, and a dry signal to the controller upon sensing these respective environments. The controller includes an alarm transducer, relays, a keyboard, and a liquid crystal display (LCD) connected to a microprocessor and associated memories. A software program stored in memory is utilized by the microprocessor to permit users to individually select alarm conditions for each probe and relay and the latching condition for each relay which conditions are stored in memory. The probes that activate each relay may also be selected and stored. There is an RS232 port connected to the microprocessor circuit via which probe status can be requested by and communicated to a remote terminal. Upon receipt of probe signals corresponding to the selected alarm and latching conditions, the microprocessor activates the alarm and relays as programmed.

Claims

1. A fluid detector comprising:

a plurality of probe means for sensing their fluid environment, each probe means including means for providing one or more of the following probe signals;

a hydrocarbon signal indicative of the presence of hydrocarbon in the probe environment, a water signal indicative of the presence of water in the probe environment, and a dry signal indicative of a dry probe environment;

alarm means for providing an alarm;

storage means for storing alarm conditions;

selecting means for permitting an operator to select one or more alarm conditions individually for each probe from a plurality of possible alarm conditions and to store said conditions in said means for storing; and

activation means responsive to said probe signals and communicating with said means for storing for activating said alarm upon receiving one or more probe signals corresponding to one or more of the stored alarm conditions.

2. A fluid detector as in claim 1 wherein said alarm means further comprises a plurality of relays, said means for storing further comprises means for storing latching conditions, and wherein said selecting means further comprises means for permitting an operator to select a latching condition individually for each relay from a plurality of possible latching conditions, to select one or more alarm conditions for each relay from a plurality of possible alarm conditions, and to store said conditions in said means for storing;

and

said activation means further comprises means responsive to said probe signals and communicating with said means for storing for latching one or more of said relays according to said selected latching conditions upon receiving one or more probe signals corresponding to one or more of said stored conditions.

3. A fluid detector as in claim 2 wherein said selecting means further comprises means for permitting an operator to individually select the probes that will activate each of said relays.

4. A fluid detector as in claim 3 wherein said selecting means further includes means for assuring that one or more alarm conditions selected for each probe are compatible with the one or more alarm conditions selected for the one or more relays to which the probe is assigned.

5. A fluid detector as in claim 3 wherein said means for selecting includes indicating means for indicating the probes selected to activate each relay.

6. A fluid detector as in claim 5 wherein said indicating means further comprises means for indicating the alarm conditions corresponding to each probe.

7. A fluid detector as in claim 6 wherein said indicating means further comprises means for indicating that the probe alarm condition selected for an individual probe corresponds to the alarm condition selected for an individual relay.

8. A fluid detector as in claim 7 wherein said indicating means comprises:

a display;

means for displaying on said display a number corresponding to the selected probe, a number corresponding to the selected relay, and the probe alarm conditions selected; and

means for causing the probe alarm condition display corresponding to the selected relay to flash.

9. A fluid detector as in claim 1 and further comprising interrogation means for receiving a system status request from a remote control device and for communicating the status of each individual probe to said remote device upon receipt of a system status request.

10. A fluid detector as in claim 1 wherein said possible alarm conditions comprise any combination of hydrocarbon, water, or dry.

11. A fluid detector as in claim 2 wherein said possible latching conditions comprise normally open and normally closed.