Float switches are used to monitor liquid levels by opening or closing when a desired action point is reached. A variety of types are available using mercury and non-mercury tilt switches and, also, permanent magnets and reed switches. Common applications include sumps, pump-control systems, bilge pumps, below ground vaults and irrigation systems.
Motion sensors (also known as vibration sensors )are very similar in design to tilt switches; in fact, some tilt switches are used as motion sensors. The sensor will be in one condition (open or closed) at rest. When it is subjected to motion it will continually change state as long as it remains in motion. Some common applications include: anti-theft devices, man-down alarms to detect non motion, smart appliances to turn off power when not in use and portable equipment to do the same.
Tilt switches are used to sense movement (tilt) of a device above and below a horizontal axis. A typical use is in a thermostat. A glass mercury switch is mounted to a bi-metallic spring which expands and contracts with temperature. As the spring moves, the switch contacts pass through the horizontal plane, opening or closing to operate the furnace or boiler. The angle through which the switch must move for proper operation -the differential angle- is measured from the point of just make to just break; it is specified as a maximum. When selecting a tilt switch, it is important to ensure that the operating mechanism can move the switch through an angle greater than the differential angle. Some additional applications include: level controls, appliances, security alarm systems, toys and games, float switches and water-treatment equipment (non-mercury).
Tip over switches sense tilt over 360 degrees of a vertical axis. A common use is in portable heaters used in the home to prevent electrical shock or fire. When the heater tilts more than a specified angle, the switch operates turning the heater off. This angle, called the operating angle, describes the angle from vertical to the point of contact operation, subject to a tolerance, ie:45 degrees plus-minus 10 degrees(35 degrees to 55 degrees). Both normally closed(tilt to close) switches are available. Some additional applications include: portable lamps, pc anti-theft devices, vending-machine alarms and machinery security systems.
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The hbs line of reed switches is the comus groups answer to the market demands for a lower cost reed switch that is still capable of handling high voltage applications. The hbs line of reed switches is ideal for certain markets such as medical applications; for example defibrillation equipment where high reliability and excellent quality is absolutely essential.
Proximity switches and sensors use a reed switch and a permanent magnet. Each is encased in a plastic housing for protection and ease of mounting. A classic use is sensing the opening of a door in a security system. A reed switch in the jamb and a permanent magnet in the door complete a circuit when the door is closed. Opening the door breaks the circuit.
A reed switch consists of two ferromagnetic and specially shaped contact blades(reeds) positioned in a hermetically sealed glass tube with a gap between them and in a protective atmosphere. The plated contact surfaces are isolated from the outside environment, which protects the contacts from contamination. Reed switches are available as form a (normally open) and form c (changeover), and are operated using a magnetic field generated by either a permanent magnet or current-carrying coil. The features that make the reed switch a valuable tool include compact size, low weight, quick response time, long life and low cost. Some common applications are: reed relays, automotive sensors, robotics sensors, security sensors and toys and games. They are also available in moulded packages affording protection from damage and in surface mount styles.
Aliava avf250 series is a common used various flow meter in auto-industry process control. It's with small volume, wide range and easily operation.
It could also measure liquid, gas and steam flow rate, especially fit for small flow rate application.
Features
4 digit flow rate & 8 digit totalizer
Local indication without auxiliary power
4-20 ma & scale pulse output
Low pressure lost on gas and steam application
Damper for gas/steam application
Consistent overall length
Heating jacket design
Intrinsically safe & explosion proof for hazardous area
Aliavtx avf7000 is a vortex flowmeters based on von karman theory of vortices generated by a bluff body in the pipe. The number of vortices are linearly proportional to the volumetric flow in the pipe.
The avf7000 is versatile flowmeter widely used for gases, steam & liquid applications. There are no moving parts and comes with either
Flange or wafer connection. Standard configuration comes with local indication for flowrate and total flow as well as a 4-20ma output function output. The electronics are designed to filter out erroneous signals as well as noise due pipe vibration.
Features
Simplified setup and diagnostic functions.
Auto. Temperature & pressure compensation
4-20 ma and pulse outputs, user selectable.
A very wide selection of sizes.
Wide temperature range of up to 420 deg. C.
Non-volatile memory for setup and calibration.
Specification
Size:10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500mm
Material:
Stainless steel 301 / 304 / 316
Accuracy:
Liquid:+/- 0.7% of reading
Gas & steam:+/- 1.0% of reading
Process connection:
Flange / wafer
Flanges type:
Jis 10k / jis 20k / jis 40k
Ansi 150# / ansi 300# / ansi 600#
Din pin 10 / pn 16 / pn25 / pn 40
Temperature:
-40 ~ +280 deg. C (standard)
-40 ~ +420 deg. C (optional)
Protection:
Ip 65
Explosion proof, exd iic t6
Intrinsically safe, e ex ia iic t4
Local display:
4 lines lcd
4 digit flowrate
8 digit totalizer
Communication:
Rs485
The adp9000 offer of configurations for differential, gas, absolute vacuum liquid-level measurements including integrated solutions for pressure, level and flow.
Features
Updating time of output current in 200 ms
Improved performance, increased accuracy, greater stability
Two years stability of 0.2%
0.075% accuracy
Parameter setting by local keypad or rs485 communication port
4-20 ma output plus direct digital hart communication
Automatic zero calibration by push button
Explosion proof and weather proof housing
Specification
Process fluid: liquid, gas of vapor
Application: differential pressure, gauge pressure, absolute pressu
Measuring range:0 - 0.25 kpa ~ 0 - 1.5 kpa ( minimum )
0 - 4.0 mpa ~ 0 - 25.0 kpa ( maximum )
Accuracy:+/- 0.75% of span
Material:
Flange/adapters: stainless steel 304 / stainless steel 316
Drains/vents: stainless steel 304 / stainless steel 316
Diaphragms: stainless steel 316l / hastelloy b /hastelloy c / monel / tantalum
Wetted o-rings: Buna n / viton / ptfe
Bolts & nuts: carbon steel / stainless steel 316
Mounting bracket: carbon steel / stainless steel 304 / 316
Name / tag plate: stainless steel 304 / stainless steel 316
Converter housing: low copper cast aluminum alloy with polyurethane, light blue paint
Enclosure:ip67 ( standard )/intrinsically safe eex ia iic t5 ( standard )/ex
We are suppliers of incomplete P1-P3 systems. All major brands to include IBM, Dell, Compaq, HP, and Gateway.
Systems are missing Hard drive and memory. Cosmetically these systems are all in excellent condition. Selling P1-P3(low end) as one mix. All P3 û 700Mhz and up separately.
Availability: These systems of all types are on a consistent basis. We are currently selling a container a week of barebones.
Packaging: All systems are palletized, approximately 100 systems on each pallet. We are doing container loads so they make height requirements for the container.
Pricing: Call today to check on the current market price.
Payment: Payment of all systems are on a prepay basis. No containers will leave the dock until payment is made in full. Deposits may be required to begin filling a container. Inquire with your sales rep for more details.
Reusable Assets, Inc. has container loads of glass cullet ready to ship. Let me know if you are interested. Glass cullet available and flurecent light bulb glass also.
