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| HVAC
Air Prover (Low Pressure) |
HVAC
systems must ensure that air is flowing before turning on heating
elements or gas burners. A pressure probe perpendicular to airflow can
prove fan operation. Probe is placed in the duct, downstream from the
fan. Switch will not permit burner ignition (or energizing of coils)
unless sensor detects positive air flow. |
HVAC
Air Prover (Vacuum)
|
Fan
operation or air flow can be confirmed using vacuum, by locating the
pressure probe to detect falling pressure at the intake, or suction
side of the fan. |
| HVAC
Air Prover (Static Pressure) |
Perpendicular
and parallel probes can be located to detect varying amounts of
positive static pressure, proving fan operation and/or true air flow. |
HVAC
Filter Indicator (Pressure)
|
A
pressure probe located downstream of the fan, but upstream of the
filter detects positive pressure limit reached as filter gets dirty.
Switch activates indicator light, alerting need for filter change. |
HVAC
Filter Indicator (Vacuum)
|
A
pressure probe downstream of the filter, but upstream of the fan
detects negative pressure limit reached as filter gets dirty. Switch
activates indicator light, alerting need for filter change. |
HVAC
Filter Indicator (Differential)
|
Pressure
probes located on opposing sides of the filter element will detect
high differential pressure reached as filter gets dirty. Switch
activates indicator light, alerting need for filter change. |
Reservoir
Level Control
|
Falling
liquid level produces vacuum in indicator tube. Sensor detects
pressure drop, starts pump. As reservoir fills, sensor detects
increase, stops pump. |
Oil/Hydraulic
Filter Alert
|
As dirty
oil or fluid loads filter element, housing pressure rises. Sensor
detects increase. Switch activates light, alerting operator of need
for filter maintenance. |
Fuel
Dispenser Auto-Shutoff
|
Sensor
in fuel dispenser handle detects increasing pressure, caused by liquid
rising in filler neck. Switch disables dispenser pump, preventing
overflow. |
Overhead
Door Safety Detector
|
Tube
edge transmits pressure increase if overhead door strikes an obstacle,
and is not within limit distance of floor. Switch reverses motor,
raising door safely. |
| Process
Break Detector |
Air jet
and probe are located on opposite sides of process. Probe does not
detect jet unless process material (sheet, roll, reel, etc.) parts or
ends. Switch turns on indicator light, alerting process break. |
| Respiratory
Sensor |
Sensor
detects patient's aspiration. Switch activates regulated supply of
oxygen, dispenses vapor, medicates, or controls other respiratory
therapy. |
HVAC/R
Defrost Sensor
|
Probes
located on opposite sides of refrigeration or cooling coils detect
change in differential pressure caused by icing of coils. Switch
alerts condition, or starts defrost cycle. |
| Tire
Pressure Monitor |
Valves
with integral pressure probe monitor tire pressure. If pressure falls
below limit, indicator light alerts need for tire pressure
maintenance. |
| Auto
Emission Control Valve |
Sensor
inside EGR valve detects absolute pressure in engine intake manifold,
enables exhaust gas recirculating emission control valve. |
| Sip and
Puff Movement Control |
Sip and
puff aspirations allow a severely disabled person to orally actuate
bed position, wheelchair movement, or other forward-reverse motorized
controls. |
| Non-Electric
Spa Pump Control |
Air
button transmits pressure change via tube to sensor, which activates
switch, controlling spa pump motor. Non-electric system avoid shock
hazard. |
| Frictionless
Air Bearing |
Sensor
controls pressure of compressed air supplied to air bearing, providing
frictionless, wear-free handling of audio, video, or computer storage
tape. |
| Tape
Braking System |
High
speed tape runs over vacuum braking grid on a film of air pressure.
When pressure is changed to vacuum, tape stops instantly, avoids
distortion. |
| Venting
Hood Monitor |
Sensor
monitors air flow above exhaust fan in fume venting hood. If fan fails
or becomes inefficient, switch activates light to alert condition, or
inhibits fume-creating process. |
| Dairy
Systems |
Sensors
monitor dairy system vacuum levels, can control milking machines, milk
transport, and storage-increasing efficiency, automation, and
sterility. |
| Therapy
Tent Nebulizer |
Venturi
draws medication from vessel. Nebulizer supplies fog to therapy tent.
Sensor monitors medication level by controlling pressure of air flow. |
| Blood
Pressure System |
Switch
controls inflation pressure of automated sphygmomanometer cuff,
tourniquet cuff, anti-shock trousers, blood-taking equipment, etc. |
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