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Your choices are...
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Instrument
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The device is (usually) a self-contained unit that provides an output, such as a display, at or near the unit. The device may also include signal processing / conditioning, for example a handheld voltmeter.
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Recorder
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A device that records measured values or accumulates totals.
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Controller
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Pressure controllers are devices that regulate either positive or negative (vacuum) pressure. They receive sensor input, provide control functions (limits, PID, logic, etc.) and output control signals.
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Other
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Other unlisted or specialized devices.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Sensor Technology:
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Your choices are...
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Mechanical Deflection
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An elastic or flexible element mechanically deflects with a change in pressure, for example a diaphragm, Bourdon tube, or bellows.
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Piston
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A sealed piston / cylinder measures changes in pressure.
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Strain Gauge
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Strain gages (strain-sensitive variable resistors) are bonded to parts of the structure that deform as the pressure changes. These strain gages are typically used as elements in a Wheatstone bridge circuit, which is used to make the measurement.
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Semiconductor Piezoresistive
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Piezoresistive sensors are based on semiconductor technology. The change in resistance is not only because of a change in the length and width (as it is with strain gage) but because of a shift of electrical charges within the resistor. These are very sensitive devices.
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Piezoelectric
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Piezoelectric pressure sensors measure dynamic and quasi-static pressures. The common modes of operation are charge mode, which generates a high-impedance charge output; and voltage mode, which uses an amplifier to convert the high-impedance charge into a low-impedance output voltage.
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Thin Film
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An extremely thin layer of material is deposited on a substrate by sputtering, chemical vapor deposition, or other technique. This technology incorporates a compact design with good temperature stability. There are a variety of materials used in thin film technology, such as titanium nitride and polysilicon.
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MEMS
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Microelectromechanical systems (MEMS) are typically manufactured by silicon surface micromachining.
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Variable Capacitance
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The capacitance change results from the movement of a diaphragm element. The deflection of the diaphragm causes a change in capacitance that is detected by a bridge circuit.
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Vibrating Element
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These devices use a vibrating element technology, such as silicon resonance.
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Other
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Other unlisted, specialized, or proprietary technologies.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Your choices are...
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Absolute
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Absolute pressure is a measurement of pressure relative to a perfect vacuum.
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Differential
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Differential pressure is a pressure measurement, which reflects the difference between two input pressures.
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Gauge
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Gauge pressure is a measurement of pressure with respect to atmospheric pressure at the user’s location. This is the most common type of pressure measurement.
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Compound
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The device can display both negative and positive pressures.
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Sealed
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Sealed gauge pressure is a measurement of pressure relative to one atmosphere at sea level (14.7 PSI) regardless of local atmospheric pressure.
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Vacuum
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Vacuum pressure is a measure of pressure lower than atmospheric pressure.
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Other
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Other unlisted, specialized, or proprietary measurement types.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Your choices are...
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Liquid
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The device measures the pressure of liquids.
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Gas
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The device measures the pressure of gases.
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Hazardous
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The device is rated by the manufacturer for hazardous duty.
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Other
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Other unlisted, specialized, or proprietary materials to measure.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Your choices are...
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Temperature Output
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The device also provides temperature measurement output.
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Temperature Compensation
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The device has built-in factors, which prevent pressure measurement error due to temperature increases or decreases.
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Negative Pressure Output
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For differential pressure measurement only.
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Alarm Indicator
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The device has a built-in audible or visual alarm, not just a switch or relay closure.
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TTL Compatible Switch
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The output switch is compatible with TTL logic.
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Other
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Other unlisted, specialized, or proprietary features.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Your choices are...
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Analog Meter
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The device has an analog meter or simple visual indicator.
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Digital
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The device has a display for numerical values.
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Video
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The device has a CRT, LCD or other multi-line display.
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Other
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Other unlisted, specialized, or proprietary displays.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Working Pressure Range
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The maximum allowable pressure at which a system or piece of equipment is designed to operate safely. The extremes of this range should be determined in accordance with the expected pressure range the device must operate within. It is common practice that this value should not exceed 75% of the devices maximum rated range. For example: if the device has a maximum rated range of 100 psi then the working range should not exceed 75 psi.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Accuracy:
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The difference (error) between the true value and the indication expressed as percent of the span. It includes the combined effects of method, observer, apparatus and environment.
ASME B40.1 and DIN accuracy grades are frequently used:
Grade 4A (0.1% Full Scale)
Grade 3A (0.25% Full Scale)
Grade 2A (0.5% Full Scale)
Grade 1A (1% Full Scale)
Grade A (1% middle half, 2% first and last quarters)
Grade B (2% middle half, 3% first and last quarters)
Grade C (3% middle half, 4% first and last quarters)
Grade D (5% Full Scale)
Measurement Accuracy (% of Full Scale). In cases where the accuracy differs between middle span and the first and last quarters of the scale, the largest % error is reported.
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Search Logic:
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All matching products will have a value less than or equal to the specified value.
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Vacuum Range:
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Measures vacuum pressure (negative pressure). Enter the range from lowest vacuum pressure to highest vacuum pressure (e.g., from 0 to 30 inches of Hg VAC).
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Operating Temperature:
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Full required range of ambient operating temperature.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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The type of electrical signal that will be produced.
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Your choices are...
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Analog Voltage
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The output voltage is a simple (usually linear) function of the measurement.
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Analog Current
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Often called a transmitter. A current (4-20mA, or any other analog current output) is imposed on the output circuit proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise, impedance, etc. This output is useful when sending signals long distances.
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RS232 / RS485
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The output of the transmitter sends out a serial communications signal.
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Parallel
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A standard digital output protocol (parallel) such as a printer port, Centronics port, IEEE 488, etc.
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HART® Protocol
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HART® (Highway Addressable Remote Transmitter) is a method of transmitting data via Frequency Shift Keying on top of the 4-20mA process signal to allow remote configuration and diagnostic checking. HART® is a registered trademark of the HART Communication Foundation
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PROFIBUS
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PROFIBUS is an open fieldbus standard for use in manufacturing and building automation, as well as process control.
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DeviceNet
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Utilizing CAN protocol, DeviceNet is a network designed to connect industrial devices such as limit switches, photoelectric cells, valve manifolds, motor starters, drives, and operator displays to PLCs and PCs.
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Foundation Fieldbus
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Fieldbus or Foundation Fieldbus is a generic term used to describe a common communications protocol for control systems and/or field instruments.
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Ethernet
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A very common method of networking computers in a LAN. Ethernet will handle about 10,000,000 bits-per-second and can be used with almost any computer.
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Frequency
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The output signal is encoded via amplitude modulation (AM), frequency modulation (FM), or some other modulation scheme such as sine wave or pulse train, but the signal is still analog in nature.
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Special Digital (TTL)
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Any digital output other than standard serial or parallel signals. Simple TTL logic signals are an example.
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Switch / Alarm
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The "output" is a change in state of a switch or alarm.
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Other
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Other unlisted, specialized, or proprietary outputs.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Scale Units:
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Scale Units: Select the desired pressure measurement units. Common units are given. Special units and compound ranges are usually available.
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Your choices are...
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psi
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Pounds per square inch (PSI).
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kPa
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kilo Pascals - standard atmospheric pressure is 101,325 Pa or 101.325 kPa
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bar
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A unit of measure of atmospheric pressure. One bar is equal to 0.987 atmospheres
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inches of Hg
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One inch of mercury is equivalent to 33.86 millibars.
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cm of Hg
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A metric measure of pressure.
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feet of H2O
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The pressure equivalent for 1 foot of water is .0295 atm
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kg/cm2
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The pressure equivalent for 1 kg/cm2 is .9678 atm
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oz/in2
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The pressure equivalent for 1 atmosphere of pressure is approx. 235 oz / in2
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inches of H2O
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The pressure equivalent for 1 inch of water is .00245 atm
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Other
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Other unlisted or specialized scale units.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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