02-10-2012, 05:43 PM
AT-89S51 BASED INDUSTRIAL FAULT MONITORING SYSTEM:
Fault_Monitoring_System.pdf (Size: 235.66 KB / Downloads: 80)
Today's industries is increasingly relying on automation. The proposed system can detect temperature
variations, over voltage, presence of noise and presence of smoke. It can also control the temperature
and voltage variation. The heart of the system is AT-89S51 controller. There is also an lcd for display
purposes. Here rf modules are used for transmission and reception purposes. A single system can detect
and control multiple faults. The programming is done in micro c.
Vaisala Humidity Sensor
The Vaisala Intercap Humidity and Temperature Probe HMPSO is a simple and cost effective
humidity transmitter suitable for volume application on integration into other manufacturer
equipment. Because of its very low current consumption and short up 4me. The 4MP50 is well
suitable for battery powered applications.A humidity sensor, also called a hygrometer, measures
and regularly reports the relative humidity in the air. They may be used in homes for people with
illnesses affected by humidity; as part of home heating, ventilating, and air conditioning (HVAC)
systems; and in humidors or wine cellars. Humidity sensors can also be used in cars, office and
industrial HVAC systems, and in meteorology stations to report and predict weather.A humidity
sensor senses relative humidity. This means that it measures both air temperature and moisture.
Relative humidity, expressed as a percent, is the ratio of actual moisture in the air to the highest
amount of moisture air at that temperature can hold. The warmer the air is, the more moisture it
can hold, so relative humidity changes with fluctuations in temperature.
Relative Humidity Sensor: Relative Humidity Sensors for BMS Duct and Room Transmitters
www.247able.com
Relative Humidity Sensors:Narrow/wide range resistive, cap. and absolute humidity sensors.
www.ohmicinstruments.com
The most common type of humidity sensor uses what is called “capacitive measurement.” This
system relies on electrical capacitance, or the ability of two nearby electrical conductors to create
an electrical field between them. The sensor itself is composed of two metal plates with a nonconductive
polymer film between them. The film collects moisture from the air, and the moisture
causes minute changes in the voltage between the two plates. The changes in voltage are
converted into digital readings showing the amount of moisture in the air.
iButtonlink Products
Humidity Display and Humidity Transducer sensor
A humidity display is a device which displays information about humidity. It can be attached to a
remote or local sensor, and may provide real time humidity updates and information, or periodic
updates, depending on design. Some humidity displays are digital, while others use analog
display dials to provide information to the observer. Many companies manufacture devices
which take and display humidity measurements and these devices can be purchased through
hardware stores, electronics suppliers, and stores which stock climate control equipment.
The HIH-4000 Series Humidity Sensors are designed specifically for high volume OEM
(Original Equipment Manufacturer) users. Direct input to a controller or other device is made
possible by this sensor's near linear voltage output. With a typical current draw of only 200 μA,
the HIH-4000 Series is often ideally suited for low drain, battery operated systems. Tight sensor
interchangeability reduces or eliminates OEM production calibration costs. Individual sensor
calibration data is available. The HIH-4000 Series delivers instrumentation-quality RH (Relative
Humidity) sensing performance in a competitively priced, solderable SIP (Single In-line
Package). Available in two lead spacing configurations, the RH sensor is a laser trimmed,
thermoset polymer capacitive sensing element with on-chip integrated signal conditioning. The
sensing element's multilayer construction provides excellent resistance to most application
hazards such as wetting, dust, dirt, oils and common environmental chemicals