Liquid Level Sensors Specifications

Meter Technology


	Meter Technology
	Your choices are...
	Differential Pressure Sensors		Differential pressure sensors measure head pressure in a vessel based on the height of the media.
	Ultrasonic / Sonic		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.
	Radar / Microwave		Device emits a microwave pulse toward process material; the pulse is reflected back by surface of material and picked up by receiver. Level is inferred from the time of flight.
	Optical		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.
	Pressure Membrane		Pressure membrane meters have a pressure-sensitive switch. They transmit pressure to an internal sensor via an organic or thin-metal membrane.
	Electrical Conductivity / Resistance		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.
	Capacitive / RF Admittance		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.
	Air Bubbler		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.
	Mechanical / Magnetic Floats		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.
	Rotation Paddle		Device uses a small electric motor drives a paddle that rotates freely in the absence of material. When the paddle is impeded by material, the motor senses this and typically triggers a switch or switches.
	Radio Frequency		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.
	Vibrating / Tuning Fork		Tuning forks use various technologies (typically piezoelectric) to vibrate a probe and then constantly monitor the presence or absence of that vibration.
	Other		Unlisted, specialized, or proprietary technology.
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More Specs


	Communication Interface
	Your choices are...
	Serial Interface		Serial interfaces use a serial communication protocol such as universal serial bus (USB), RS232, or RS485.
	Parallel Interface		Parallel interfaces use a parallel communication protocol such as general-purpose interface bus (GPIB).
	Other Interface Type		Devices use other, unlisted communication interfaces (e.g., modems, RF transmitters).
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	Mounting
	Your choices are...
	Side Mount		The device mounts on the side of the vessel which contains the media to measure.
	Top Mount		The device mounts on top of the vessel which contains the media to measure.
	Bottom Mount		The device mounts at the bottom of the vessel which contains the media to measure.
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	Display:
	Your choices are...
	Visual or Audio Output		The display has a non-electrical visual indicator such as simple float, or an audible click.
	Analog Meter / Indicator		The display has an analog meter (typically with a needle), or uses LED indicators.
	Digital Readouts		The device displays numerical or application-specific readouts.
	Video Display Terminal (VDT)		Video display terminals (VDT) include cathode ray tubes (CRT) and flat panel displays (FPD).
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	User Interface:
	Your choices are...
	Analog Front Panel		The interface has analog inputs such as potentiometers, dials, or switches.
	Digital Front Panel		The device is set up or programmed through a digital front panel.
	Computer Controllable		The device can be controlled remotely via a computer interface.
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	Features
	Your choices are...
	Rated for Sanitary Applications		Devices are rated for sanitary applications such as those found in the pharmaceutical and food processing industries.
	Handles Slurries / Suspended Solids		Devices can handle slurries or suspended solids such as sewage and wastewater.
	Built-in Alarm / Indicator		Devices have a built-in audible or visual alarm that is more than a switch or relay closure.
	Programmable		Devices can be programmed for different ranges, materials, outputs, etc.
	Recorder / Totalizer Functions		Devices are data loggers which record/totalize and integrate measured values.
	Controller Functions		Devices have or take sensor inputs, provide control functions (e.g., limits, PID, logic), and output a control signal.
	Search Logic:		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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