Dry Material (Powders) Level Sensors Specifications | Engineering360

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Help with Dry Material (Powders) Level Sensors specifications:

Device Classification


	Device Classification
	Your choices are...
	Sensor-Only		By definition, a sensor is a transducer, its output is meant for processor, controller or data acquisition system. No display or user interface is present. If you desire a switch, choose this option.
	Sensor System		By definition, a sensor system has more capability than a transducer. The unit may have a display and/or a user interface. If you desire a simple gauge, a locally programmable unit (stand-alone) or a controller / totalizer, choose this option.
	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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Instrument (Sensor System) Only Options


	Instrument Display Options:
	Your choices are...
	Nonelectrical visual or audio output		The display has a non-electrical visual indicator such as simple float, or an audible click.
	Analog Meter or 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).
	Search Logic:		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.

	Instrument User Interface Options:
	Your choices are...
	Analog Front Panel		Has analog user inputs such as potentiometers, dials, switches, etc.
	Digital Front Panel		Setup or program through the front panel using digital keypad & displays, menus, etc.
	Computer Controllable		The device can be controlled remotely via a computer interface.
	Search Logic:		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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Features


	Sanitary Applications rated (3A, etc.)?		Devices are rated for sanitary applications such as those found in the pharmaceutical and food processing industries.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Can handle liquids with suspended solids (slurries)?		Device can handle slurries, such as sewage water/ waste water.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Built in alarm indicator?		Devices have a built-in audible or visual alarm that is more than a switch or relay closure.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Programmable?		Device can be programmed for different ranges, materials, outputs, etc.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Recorder / Totalizer Functions?		Records and/or totalizes or integrates measured values (data logger).
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

	Controller Functions?		Has/takes sensor input, provides control function (Limits, PID, logic, etc.) and outputs a control signal.
	Search Logic:		"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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Level Measurement Type


	Level Measurement Type
	Your choices are...
	Continuous Level		Device measures level within a specified range, output gives a continuous reading of level.
	Point Level / Multi-Point Levels		Device marks a specific level, generally used as high alarm or switch. Multiple point sensors can be integrated together to give a stepped version of continuous level.
	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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Measuring Range


	Number of Switch Points		The level sensing device has a series of switches along the probe. When the material is present this causes the switch to activate.
	Search Logic:		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.

	Measuring Range		The level range that devices can measure.
	Search Logic:		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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Output Options


	Output Options
	Your choices are...
	Analog Voltage		The output is an analog voltage signal.
	Analog Current		Output signal is a current, representing level.
	Frequency or Modulated Frequency		Frequency or modulated frequency output (e.g., sine wave, pulse train, AM, or FM)
	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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Field Adjustable Performance


	Field Adjustable Measurement Ranges?		Different ranges can be selected while devices are in the field.
	Search Logic:		"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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Process Operating Conditions


	Maximum Operating Pressure		Maximum pressure environment device is rated for.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Material Temperature Range		Maximum material temperature device is rated for.
	Search Logic:		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.

	Material Density:		Material Density listed is the maximum material density.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

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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		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.
	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 or 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 signals 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, which rotates freely in the absence of material. When the paddle is impeded by material, the motor senses this and typically triggers a switche(s).
	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 Method		Tuning forks use various technologies (typically piezoelectric) to vibrate a probe and then constantly monitor the presence or absence of that vibration.
	Other		Other unlisted, specialized, or proprietary meter technology.
	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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Communication Interface Options


	Communication Interface Options
	Your choices are...
	Serial Interface		Serial communication protocol such as RS232, RS485, USB.
	Parallel Interface		Parallel interfaces use a parallel communication protocol such as general-purpose interface bus (GPIB).
	Other		Devices use other, unlisted communication interfaces (e.g., modems, RF transmitters).
	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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Mounting Options


	Mounting Options
	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.
	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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