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Media Type:
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Your choices are...
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Liquid
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Devices measure liquids.
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Dry Material (Bulk Solids and Powders)
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Devices measure dry materials, including powders and bulk solids.
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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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Level Measurement Type:
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Your choices are...
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Continuous Level
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Devices measure levels within a given range. The output provides a continuous reading of the level.
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Point Level / Multi-Point Levels
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Devices mark a specific level and are generally used as a high alarm or switch. Multiple-point sensors can also be integrated in one device to add a low alarm, or to serve as a stepped version of a continuous level.
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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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Output Options:
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Your choices are...
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Analog Voltage Signal
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The output is an analog voltage signal.
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Analog Current Signal (e.g., 4-20 mA)
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The output is an analog current signal (transmitter) such as 4-20 mA.
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Frequency / Modulated Frequency
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The output is a frequency or modulated frequency (e.g., sine wave, pulse train, AM, FM).
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Alarm / Visual Indicator
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The output is an audible alarm or visual indicator.
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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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Measuring Range
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The level range that devices can measure.
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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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Allowable Sensor Over-Range
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Overrange specification limits the range of matching products to the specified
range multiplied by a selected overrange factor. This keeps returned matches
close to the range requirement and filters out products with a wider range
than needed. "From", "To", and "Overrange" must all be specified to
activate this option. Example: User specifies a sensor with a range from
0-100. Without overrange specification, sensors with ranges of 0-100, 0-1000,
and -10,000 to +10,000 are returned as matches. An overrange specification
of 50% will filter out any sensors with a full scale range greater than 150.
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Search Logic:
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Matching products will have a range within the specified overrange limit.
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Maximum Operating Pressure
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The maximum operating pressure for which devices are rated.
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Search Logic:
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All matching products will have a value greater than or equal to the specified value.
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Material Temperature Range
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The maximum material temperature for which devices are rated.
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Search Logic:
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User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Field Adjustable?
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Different ranges can be selected while devices are in the field.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Meter Technology:
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Your choices are...
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Air Bubbler
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Air bubblers feed a gas (usually air) at constant volumetric rate through a bubble tube submerged in a liquid. The amount of pressure needed to force the bubble from the bottom of the tube is equal to the hydrostatic pressure at that point.
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Capacitive / RF Admittance
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Capacitive or RF admittance devices use a radio frequency (RF) technique that is based on differing dielectric constants. The impedance from the RF signal changes whenever the material approaches the sensing region.
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Differential Pressure Sensors
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Differential pressure sensors measure head pressure in a vessel based on the height of the media.
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Electrical Conductivity or Resistance
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Electrical conductivity or resistance-based devices use a low-voltage power source applied across separate electrodes. A conductive liquid which contacts both probes completes a conductive circuit.
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Mechanical / Magnetic Floats
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Mechanical devices or magnetic floats use sealed reed switches in a stem with a permanent magnet installed in the float. As the float rises or falls, the switch is activated.
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Optical
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Optical devices use optic sensors and the principle of optical reflection to detect the presence or absence of fluid. Typically, light emitting diodes (LEDs) are used as the light source.
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Pressure Membrane
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Pressure membrane meters have a pressure-sensitive switch. They transmit pressure to an internal sensor via an organic or thin-metal membrane.
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Radar / Microwave
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Radar or microwave devices send a microwave pulse toward the process material. The pulse is reflected back by the material's surface and detected by the receiver. The level is inferred from the time of flight.
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Radio Frequency
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Radio frequency (RF) devices emit a high-frequency/low-power radio signal from a probe. When the material contacts the probe, the bridge becomes unbalanced and a comparing circuit realizes the change. This causes a relay output to change state.
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Rotation Paddle
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Rotation paddles are small electric motors that drive a paddle which rotates freely in the absence of material. When the paddle is impeded by material, the motor senses this and typically triggers a switch.
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Ultrasonic / Sonic
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Ultrasonic or sonic devices measure the length of time it takes for a reflected sound wave to return to a transducer. Transmitted time is proportional to level.
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Vibrating / Tuning Fork Method
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Tuning forks use various technologies (typically piezoelectric) to vibrate a probe and then constantly monitor the presence or absence of that vibration.
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Other
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Other unlisted, specialized, or proprietary meter 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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Mounting Options:
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Your choices are...
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Side Mount
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The device mounts on the side of the vessel which contains the media to measure.
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Top Mount
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The device mounts on top of the vessel which contains the media to measure.
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Bottom Mount
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The device mounts at the bottom of the vessel which contains the media 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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Communication Interface Options:
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Your choices are...
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Serial Interface
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Serial interfaces use a serial communication protocol such as universal serial bus (USB), RS232, or RS485.
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Parallel Interface
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Parallel interfaces use a parallel communication protocol such as general-purpose interface bus (GPIB).
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Other
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Devices use other, unlisted communication interfaces (e.g., modems, RF transmitters).
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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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Instrument Display Options:
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Your choices are...
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Non-Electrical Visual or Audio Output
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The display has a non-electrical visual indicator such as simple float, or an audible click.
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Analog Meter or Indicator
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The display has an analog meter (typically with a needle), or uses LED indicators.
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Digital Readouts
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The device displays numerical or application-specific readouts.
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Video Display Terminal (VDT)
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Video display terminals (VDT) include cathode ray tubes (CRT) and flat panel displays (FPD).
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Search Logic:
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Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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