Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1978-12-19
1981-04-21
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular system function
340588, 340589, 340661, 328 48, 328162, 324 98, 34087043, G08B 2300, H03K 2134
Patent
active
042635837
ABSTRACT:
A digital alarm system for monitoring a variable process signal utilizing a variable, digitally controlled alarm hysteresis capability. The system includes a means for establishing a preselected count level at which an alarm condition occurs. The preselected count level may be established in a high alarm or a low alarm state depending upon the process signal being monitored. Digital signals representative of the process variable are compared with the preset count level signals and upon a coincidence, an output signal is generated to provide alarm signals and also to reset the preselected count level signal to a second preselected count at a level which is a wide variation from the original preselected level so a relatively large change in the process signal occurs before the system is reset to its original alarm condition.
REFERENCES:
patent: 3214700 (1965-10-01), Hook
patent: 3588710 (1971-06-01), Masters
patent: 3735273 (1973-05-01), Wright et al.
patent: 3832577 (1974-08-01), Harr
patent: 3956705 (1976-05-01), Mayer
patent: 4101839 (1978-07-01), Poole et al.
patent: 4161628 (1979-07-01), McRae
Aquilino Nicholas J.
Caldwell Sr. John W.
Crosland Donnie L.
LandOfFree
Digital alarm system with variable alarm hysteresis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital alarm system with variable alarm hysteresis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital alarm system with variable alarm hysteresis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-560329