Humidity Measurement Instruments Specifications

Performance Specifications


	Relative Humidity Range:		Relative humidity range is the ambient range of relative humidity that devices can measure with a linear response.
	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.

	Relative Humidity Accuracy:		Relative humidity accuracy indicates the closeness of a measured or computed relative humidity value to its true value.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

	Dew Point Range		Dew point range is the ambient dew point range that devices are able to measure with a linear response.
	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.

	Dew Point Accuracy		Dew point accuracy indicates the closeness of a measured or computed dew point value to its true value.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

	Compensation
	Your choices are...
	Temperature Compensated		Output readings remain constant across a range of temperatures as long as the temperature changes are within the temperature-compensated range.
	Pressure Compensated		Output readings remain constant across a range of pressures as long as the pressure changes are within the pressure-compensated range.
	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.

	Operating Temperature		This is the temperature range in which devices are designed to operate.
	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.

User Interface


	Display
	Your choices are...
	Analog Meter or Gauge		Analog meters or gauges include needle meters, light emitting diode (LED) indicators, etc.
	Digital Readouts		Digital readouts are numerical or application-specific displays.
	Video Display Terminal		Video display terminal (VDT) styles include cathode ray tube (CRT), flat panel displays (FPD), etc.
	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 Outputs
	Your choices are...
	Analog Current		Devices provide variable current level outputs such as 0 - 20 mA, 4 - 20 mA current loop, etc.
	Analog Voltage		Devices provide variable voltage outputs such as 0 - 10 V, ±5 V, etc.
	Frequency or Pulse		Outputs are frequencies or pulse signals such as amplitude modulation (AM), frequency modulation (FM), or pulse width modulation (PWM) monitoring or control.
	Switch or Relay		Devices provide switch-type outputs in which the contacts are open or closed depending on the state of the variable being monitored.
	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.

	Digital Outputs
	Your choices are...
	Ethernet		Ethernet is a local area network (LAN) protocol that uses a bus or star typology and supports data transfer rates of 10 Mbps. The Ethernet specification is the basis for the IEEE 802.3 standard, which specifies the physical and lower software layers. To handle simultaneous demands, Ethernet uses carrier sense multiple access / collision detection (CSMA/CD) to monitor network traffic.
	Modem		Modems (modulators-demodulators) are devices or programs that allow computers to transmit data over telephone lines. They convert digital computer data to analog sound waves and then demodulate the carrier signals to decode the transmitted information.
	Parallel Interface		Parallel interfaces are channels that can transfer more than one bit at the same time.
	SCSI		Small computer systems interface (SCSI) is an intelligent I/O parallel peripheral bus with a standard, device-independent protocol that allows many peripheral devices to be connected to the SCSI port. A single SCSI bus can drive up to eight devices or units: the host adapter or controller, and seven other devices. Each device is assigned a different SCSI ID, ranging from 0 to 7. SCSI formats include SCSI-1, SCSI-2, SCSI-3, Wide SCSI, Fast SCSI, Wide Fast SCSI, Ultra SCSI, Ultra2 SCSI, Ultra3 SCI (Ultra160), Ultra 320 SCSI, and Ultra640 SCSI.
	Serial Interface		Serial interfaces are channels in which only one bit of data is transmitted at a time.
	TTL		Transistor-transistor logic (TTL) is a common type of digital circuit in which the output is derived from two transistors.
	USB		Universal serial bus (USB) is a 4-wire, 12-Mbps serial bus for low-to-medium speed peripheral device connections to personal computers (PC), including keyboards, mice, modems, printers, joysticks, audio functions, monitor controls, etc. The USB design is standardized by the USB Implementers Forum (USBIF), an organization that includes leading companies from the computer and electronics industries. The current USB specification is USB 2.0, which supports data transfer rates of up to 480 Mbps.
	Other		Other unlisted, specialized, or proprietary outputs.
	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.

Technology



	Your choices are...
	Capacitive		When capacitive materials absorb moisture, their dielectric properties change and their capacitance increases.
	Chilled Mirror		Mirrors are chilled to a temperature, the dew point, at which moisture begins to condense on the surface.
	Electrolytic		Moisture is proportional to the current needed to electrolyze it from a desiccant (e.g., P2O5).
	Infrared		Infrared (IR) instruments use the infrared spectrum to measure the absorption of moisture.
	Microwave		This non-contact technology is used to measure moisture in a wide variety of materials. The amplitude and phase of a microwave signal is directly affected by the amount of moisture in a material.
	Nuclear		Neutrons are slowed by the presence of moisture in a material.
	Psychrometer		Relative humidity is determined by measuring the temperature difference between two thermometers, one wet and one dry.
	Resistive		When resistive materials absorb moisture, their resistivity or impedance changes.
	Strain Gauge / Piezoresistive		Strain gauges or piezoresistive elements are used to measure the expansion of materials that absorb water (e.g., cellulose crystallite).
	Other		Other unlisted, specialized, or proprietary technologies.
	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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