Dry Material (Powders) Level Switches Specifications

Switch Specifications


	Switch Type:
	Your choices are...
	Electromechanical Switch		Electromechanical switches have mechanical contacts or relays.
	Solid-State Switch		Solid-state switches are electronic devices with no moving parts.
	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.

	Configuration (Normal State):
	Your choices are...
	Normally Open (NO)		A term used to describe contacts which interrupt the circuit when in their normal position.
	Normally Closed (NC)		A term used to describe contacts which establish a circuit when in their normal position.
	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.

	Pole and Throw Specifications:
	Your choices are...
	Single Pole, Single Throw (SPST)		Single pole, single throw (SPST) switches make or break the connection of a single conductor in a single branch circuit. They usually have two terminals and are referred to as single-pole switches.
	Single Pole, Double Throw (SPDT)		Single pole, double throw (SPDT) switches make or break the connection of a single conductor with either of two other single conductors. They usually have three terminals and are commonly used in pairs. SPDT switches are sometimes called three-way switches.
	Double Pole, Single Throw (DPST)		Double pole, single throw (DPST) switches make or break the connection of two circuit conductors in a single branch circuit. They typically have four terminals.
	Double Pole, Double Throw (DPDT)		Double pole, double throw (DPDT) switches make or break the connection of two conductors to two separate circuits. They typically have six terminals and are available in both momentary and maintained contact versions.
	Other Type (Special Application)		Other, special throw types with more than two poles. Examples include switches that are designed to split loads into separate circuits (e.g., headlamp switch).
	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.

Electrical Switch Specifications


	Maximum Current		The device's maximum nominal (name plate) current-carrying capacity.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Maximum AC Voltage		The device's maximum AC voltage rating.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	Maximum DC Voltage		The maximum DC voltage capacity of a device
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

	TTL Compatible?		The switch is compatible with transistor-transistor logic (TTL) circuits.
	Search Logic:		"Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.

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		The maximum material density for which devices are rated.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

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.

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 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 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, unspecified, or proprietary technology types.
	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.

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 Interface Type		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.

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?		Devices 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?		Devices have or take sensor inputs, provide control functions (e.g., limits, PID, logic), and output 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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