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Supplier: Mettler-Toledo GmbH
Description: With its ergonomic design, this lightweight instrument fits neatly into your hand Easy sampling Comfortable measuring, using the joystick to control the automatic sampling pump, and avoid the added strain of manual sampling Result range limits Set up a
- Instrument Type: Density Instruments
- Temperature Range: 14 to 122 F
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Supplier: Mettler-Toledo GmbH
Description: . Analyze on the go With its ergonomic design, this lightweight instrument fits neatly into your hand Easy sampling Comfortable measuring, using the joystick to control the automatic sampling pump, and avoid the added strain of manual sampling Result
- Instrument Type: Density Instruments
- Temperature Range: 32 to 122 F
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Supplier: AMETEK Sensors, Test & Calibration
Description: Key Features Measures density of small samples of solid materials Simple set-up, operation and maintenance Complies with BS2782 part 6 Method 620D, ASTM D1505-68, ISO 1183 and other international standards Accuracy to 0.0001g/ml Constant temperature control via heating and
- Display & Special Features: Laboratory / Batch
- Property Analyzed: Other
- Test Media / Material: Polymers (Plastics, Elastomers)
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Description: ISO 7971-2:2009 specifies a test method for ensuring the traceability of mass per hectolitre measuring instruments through reference to standard measurement instruments. The mass per hectolitre or bulk density is of commercial importance for grain cereals. Several
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Supplier: Servoflo Corporation
Description: density of the gas surrounding it. In order to compensate for temperature effects, a platinum resistor that precisely measures the local temperature is built into the sensor. The sensor is very compact with a diameter of 33 mm and a length of 63 mm and can be placed in even the
- Density Range: 2.00E-4 to 0.0190 g/cm³
- Instrument Type: Density Instruments
- Media Type: Gas
- Pressure Range: 0.0 to 145 psi
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Supplier: AMETEK Programmable Power
Description: control instrument capable of acquiring data from thermocouples, RTDs, thermistors, and voltage/current sensors at rates up to 1000 samples per second. Plug-in switch/multiplexer modules are used to expand the number of channels that can be scanned in a single system. The
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Supplier: AMETEK Programmable Power
Description: “True RMS” AC readings Supports frequency and temperature (thermocouple, RTD and thermistor) measurements With the EX1200-2365 installed, EX1208A mainframes become a cost-effective, high-density, scanning measurement and control instrument capable of
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Supplier: AMETEK Programmable Power
Description: waveforms without the system controller’s intervention. The data may be paced out of the instrument by using either a user-supplied clock or the internal programmable timer with output rates up to 500 kSa/s. Each channel is true-differential, and has sense lines that can be
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Supplier: AMETEK Programmable Power
Description: waveforms without the system controller’s intervention. The data may be paced out of the instrument by using either a user-supplied clock or the internal programmable timer with output rates up to 500 kSa/s. Each channel is true-differential, and has sense lines that can be
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Density and Specific Gravity Instruments - Radiometric Sensor for Density Measurement -- MINITRAC 31Supplier: VEGA Americas, Inc.
Description: Application area The point detector determines the density of liquids and bulk solids from the outside without contact. The sensor is used on vessels of any geometry and on pipelines. The Minitrac 31 is a radiation-based sensor for non-contact density measurement of liquids and
- Display & Special Features: In-Line
- Instrument Type: Density Instruments
- Media Type: Liquid, Solid
- Technology Type: Digital Instrument
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Supplier: Micromeritics
Description: The GeoPyc 1360 Envelope Density Analyzer is a revolutionary instrument for rapidly measuring the envelope density of porous objects of irregular size and shape. Particle Size should exceed 2 mm for best results. Envelope density, or bulk density as it is
- Display & Special Features: Laboratory Style (Benchtop or Handheld)
- Instrument Type: Density Instruments
- Media Type: Solid
- Technology Type: Digital Instrument, Other
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Supplier: CSA Group
Description: ISO 7971-2:2009 specifies a test method for ensuring the traceability of mass per hectolitre measuring instruments through reference to standard measurement instruments. The mass per hectolitre or bulk density is of commercial importance for grain cereals. Several
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Supplier: Eagle Eye Power Solutions, LLC
Description: The SG-Pro digital hydrometer/density meter offers 99.999% accurate, temperature compensated specific gravity, density, and density-related values. Select from multiple units of measure to suit your measurement needs or create custom user-defined requirements.
- Density Range: 0.0 to 3 g/cm³
- Display & Special Features: Laboratory Style (Benchtop or Handheld), Computer Interface / Networkable, Data Storage Options, Temperature Compensated, Temperature Measurement
- Instrument Type: Density Instruments, Hydrometer
- Media Type: Liquid
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Supplier: Eagle Eye Power Solutions, LLC
Description: specific gravity/liquid density during a mixing, blending, fermentation, distillation, or plating operation. The SG-100M offers many user-customized options that allow the instrument to fit your exact measuring needs. The measurement probe can be purchased independently
- Density Range: 0.5500 to 2 g/cm³
- Display & Special Features: Laboratory Style (Benchtop or Handheld), In-Line, Computer Interface / Networkable, Graphic / Video Display, Data Storage Options, Temperature Compensated, Temperature Measurement
- Instrument Type: Density Instruments, Hydrometer
- Media Type: Liquid
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Supplier: Anton Paar
Description: 90°) is used to prevent the influence of particle size on the turbidity value. The measurement is carried out at a wavelength of 650 nm ±30 nm (MEBAK- and EBC-compliant) in a cell with adjustable constant temperature. This turbidity measuring module expands Anton Paar's product
- Display Type: Digital Display
- Measures Turbidity: Yes
- Mounting / Environment: Lab / Benchtop, In-Situ / Field
- Turbidity Range: 0.0 to 400 NTU (Nephelometric Turbidity Units)
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Supplier: FLEXIM AMERICAS Corp.
Description: . Here, it is used to measure the alcohol or sugar content in liquids and is a proven method for CIP process optimization. Advantages of PIOX S: Non-Intrusive, Installation without process interruption (clamp-on) No contact with the medium, no special
- Display & Special Features: Clamp On, Temperature Compensated, Temperature Measurement
- Instrument Type: Density Instruments
- Media Type: Liquid
- Technology Type: Digital Instrument
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Supplier: Precision Measurement Engineering, Inc.
Description: -linearly proportional to the solution temperature. Special emphasis is placed on making rapid, small spatial resolution measurements of both parameters in laboratory situations. MSCTI has been used to measure turbulent density and temperature variations in
- Controller Functionality: Yes
- Display Type: Digital Display
- Electrical Output: Analog Voltage Output
- Mounting / Environment: Lab / Benchtop
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Supplier: Lake Shore Cryotronics, Inc.
Description: measure down to 0.5 µO and as high as 200 GO in DC fields. You can also determine carrier density and carrier mobility versus temperature.
- Device Type: Magnetic Field Sensor
- Form Factor: Desktop / Module
- Measurement Features: Direction Measurement
- Outputs / Interfaces: Digital
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Supplier: Albér
Description: The Anton-Paar DMA-35 is a handheld, stand-alone digital density meter suitable for use in demanding industrial environments. Measuring specific gravity and electrolyte temperature has always been a time consuming, messy chore requiring two technicians: one to take the
- Density Range: 0.0 to 3 g/cm³
- Display & Special Features: Laboratory Style (Benchtop or Handheld), Insertion Type, Graphic / Video Display, Data Storage Options, Percent Content Scale, Temperature Measurement
- Instrument Type: Density Instruments, Hydrometer
- Media Type: Liquid
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Supplier: Eagle Eye Power Solutions, LLC
Description: The Eagle Eye SG-Ultra digital hydrometer/density meter offers 99.999% accurate, temperature-compensa ted specific gravity, density, and density-related values. Select from multiple units of measure to suit your measurement needs or create custom user-defined
- Density Range: 0.0 to 2 g/cm³
- Display & Special Features: Laboratory Style (Benchtop or Handheld), Insertion Type, Computer Interface / Networkable, SPC / Application Software, Graphic / Video Display, Data Storage Options, Temperature Compensated, Temperature Measurement
- Instrument Type: Density Instruments, Hydrometer
- Specific Gravity (Relative Density): 0.0 to 2 #
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Supplier: Biochrom, Ltd.
Description: Description The Biochrom WPA CO8000 is a robust, easy to use instrument dedicated to the measuring of the density of cells in suspension such as E.coli, yeast, cells and other cell cultures. This hand held instrument has an integral battery allowing
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Supplier: TSI Incorporated
Description: The Airflow™ Instruments Micromanometer PH730 is one of the most advanced, versatile, and easy to use micromanometers on the market today. The PH730 features an auto-zeroing pressure sensor that increases measurement resolution and accuracy along with an intuitive menu
- Instrument Style: Flow Hood or Balometer
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Supplier: ASTM International
Description: through calculations that use established properties of thermal conductivity, density, and specific heat. 1.3 This test method is intended for measuring fabrics in a dry state at ambient conditions. 1.4 The values stated in SI units are to be regarded as standard. No
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Supplier: ASTM International
Description: through calculations that use established properties of thermal conductivity, density, and specific heat. 1.3 This test method is intended for measuring fabrics in a dry state at ambient conditions. 1.4 The values stated in SI units are to be regarded as standard. No
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Supplier: TSI Incorporated
Description: accurate readings Multiple hood sizes available for easy, cost effective use across multiple jobs Detachable digital micromanometer offers flexibility to use in multiple applications Detachable Micromanometer Accurately measures pressure, velocity and
- Instrument Style: Flow Hood or Balometer
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Supplier: ASTM International
Description: procedures to provide correlation with the 25-cm Epstein test method (Test Method A343/A343M). 1.4 The range of magnetic flux densities is governed by the properties of the test specimens and the instruments and test power source. Nonoriented electrical steels may be tested at
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Supplier: ASTM International
Description: provide correlation with the 25-cm Epstein test method (Test Method A 343/A 343M). 1.4 The range of magnetic flux densities is governed by the properties of the test specimens and the instruments and test power source. Nonoriented electrical steels may be tested at magnetic flux
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Description: instruments that are available commercially and of interest to the natural gas industry. The density at reference conditions (sometimes referred to as normal, standard or even base density) is required for conversion of volume data and can be used for other
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Description: The Laser Dust Sensor is used to measure the concentration of suspended particles in the air with different sizes (including PM2 5). It uses a laser diode as the light source to illuminate the sampling air boosted by the blower. When the small particles in the air
- Detector Range: 3.00E-7 to 1.00E-5 m
- Device Classification: Sensor
- Measurement Output: Dust Density
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Description: The Laser Dust Sensor is used to measure the concentration of suspended particles in the air with different sizes (including PM2 5). It uses a laser diode as the light source to illuminate the sampling air boosted by the blower. When the small particles in the air
- Detector Range: 3.00E-7 to 1.00E-5 m
- Device Classification: Sensor
- Measurement Output: Dust Density
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Supplier: Siemens Analytical Products
Description: Most frequently used for demanding applications, the ULTRAMAT 6 must meet high standards with regard to reliability and measuring quality. This is guaranteed by modern electronics, ease of operation and a physical element that is adapted to the measuring task. The
- Application: Continuous Emissions Monitoring
- Display: Digital
- Electrical Outputs: Analog Current, Switch
- Features: Audible or Visual Alarms, Self Calibration
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Supplier: Bronkhorst USA
Description: How to overcome the disadvantages of using weighing scales? How to shorten production time whilst improving the quality of the final product? The integration of (mini) CORI-FLOW™ instruments in your production line offers unprecedented improvement to process
- Mass Flow Rate: 3.67E-7 to 1.1 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- End Fittings: Compression
- Features: Measures Density, Measures Temperature, Controller Functions, Recorder / Totalizer Functions
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Supplier: Endress+Hauser, Inc.
Description: The OUSAF44 sensor combined with the flow assembly OUA260 is used for measuring the spectral absorbance of process liquids in the ultraviolet region of the electromagnetic spectrum. Your benefits: Accurate measurement - Measuring range up to 50 OD (depending on
- Built in Calibration: Yes
- Device Classification: Sensor
- Field Calibration: Yes
- Measurement Output: Optical Density
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Supplier: Cubic Sensor and Instrument Co.,Ltd.
Description: PM2105-M is a laser particle sensor module for indoor use based on laser scattering technology. The sensor can measure particle mass concentration in µg/m³ directly via mathematical algorithm and scientific calibration. FEATURES Real-time output particle mass
- Device Classification: Sensor, Sensor System
- Electrical Output: Analog Voltage, Analog Current
- Input Power: DC Power
- Measurement Output: Dust Density
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Supplier: Siemens Analytical Products
Description: The "Combi-Analyzer" ULTRAMAT/OXYMAT 6 combines the features of the ULTRAMAT 6 and OXYMAT 6 in one analyzer in a 19" rack design. Most frequently used for demanding applications, the ULTRAMAT 6 must meet high standards with regard to reliability and measuring quality. This is
- Application: Continuous Emissions Monitoring
- Display: Digital
- Electrical Outputs: Analog Current, Switch
- Instrument Type: Analyzer
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Supplier: Endress+Hauser, Inc.
Description: - Insertion sensor with Triclamp or Varivent connections for sanitary applications in pipes and vessels Two pathlengths available: 5 and 10 mm Measuring range: 0 to 3 AU (absorption units) Low-voltage incandescent lamp provides long service life and stable operation
- Built in Calibration: Yes
- Device Classification: Sensor
- Field Calibration: Yes
- Measurement Output: Optical Density
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Supplier: Siemens Analytical Products
Description: . The multi-layer detectors used guarantee high selectivity and reduced water vapour interference. The measuring cells used are robust and resistant and can easily be cleaned in case of faults pollution, induced by faults in the sample preparation leading to soiling. The
- Application: Continuous Emissions Monitoring
- Display: Digital
- Electrical Outputs: Analog Current, Switch
- Features: Self Calibration
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Supplier: CSA Group
Description: ISO/TR 3313:2018 defines pulsating flow, compares it with steady flow, indicates how it can be detected, and describes the effects it has on orifice plates, nozzles or Venturi tubes, turbine and vortex flowmeters when these devices are being used to measure fluid flow in a pipe.
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Supplier: Bronkhorst USA
Description: an alternative way to control the flow. Instead of using a control valve, the Coriolis flow meter can be combined with a gear pump, thus eliminating the need of pressurising the liquid source. Alternative to Thermal Gas Mass Flow Controllers Compared to traditional
- Mass Flow Rate: 3.67E-6 to 0.0073 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- End Fittings: Compression
- Features: Measures Density, Measures Temperature, Controller Functions, Recorder / Totalizer Functions
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Supplier: Bronkhorst USA
Description: an alternative way to control the flow. Instead of using a control valve, the Coriolis flow meter can be combined with a gear pump, thus eliminating the need of pressurising the liquid source. Alternative to Thermal Gas Mass Flow Controllers Compared to traditional
- Mass Flow Rate: 3.67E-6 to 0.0073 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- End Fittings: Compression
- Features: Measures Density, Measures Temperature, Controller Functions, Recorder / Totalizer Functions
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Supplier: Bronkhorst USA
Description: alternative way to control the flow. Instead of using a control valve, the Coriolis flow meter can be combined with a gear pump, thus eliminating the need of pressurising the liquid source. Alternative to Thermal Gas Mass Flow Controllers Compared to traditional thermal
- Mass Flow Rate: 1.10E-4 to 0.1103 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- End Fittings: Compression
- Features: Measures Density, Measures Temperature, Controller Functions, Recorder / Totalizer Functions
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Supplier: Sensidyne, LP
Description: The Sensidyne Nephelometer is an advanced real-time dust monitor accurately measuring dust concentrations using proven light scatter technology. This portable instrument accurately measures and records dust from 1-10,000 µg/m3 with resolution to 1 µg/m3. Sample
- Application Software Included: Yes
- Computer Interface: Serial
- Device Classification: Sensor System
- Display Type: Digital
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Supplier: ABB Measurement & Analytics
Description: affected by most common background gases, it provides a direct measure of singlet-oxygen density, [O2(a1?g)], in a wide variety of these background gases with high precision (better than 1014 molecules/cm3) and a rapid response rate (data rate up to 1 Hz). The Singlet-Oxygen Gas
- Instrument Type: Analyzer
- Measurement Type: Trace
- Number of Gases Sensed: Single Gas
- Specific Gas Types: Oxygen (O2)
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Supplier: Dataforth Corporation
Description: The 8BP01 is offered as a 5VDC powered (8BP01-X05) or 7 to 34VDC powered (8BP01-X24) single channel DIN rail mount carrier suitable for any 8B signal conditioner. The 8B carrier can be mounted on any standard DIN rail (EN 50022-35 and EN 50035-G32). The 8BP01 measures only 2.32” x
- Analog Input Channels: 0.0 #
- Application: General Lab and Industrial
- Auxiliary Outputs: Current Output
- Form Factor: DIN Rail
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Supplier: Dataforth Corporation
Description: The 8BP01 is offered as a 5VDC powered (8BP01-X05) or 7 to 34VDC powered (8BP01-X24) single channel DIN rail mount carrier suitable for any 8B signal conditioner. The 8B carrier can be mounted on any standard DIN rail (EN 50022-35 and EN 50035-G32). The 8BP01 measures only 2.32” x
- Analog Input Channels: 0.0 #
- Application: General Lab and Industrial
- Auxiliary Outputs: Current Output
- Form Factor: DIN Rail
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Supplier: InspectorTools
Description: The First Step to Optimizing Performance Is Knowing: The current environmental conditions can often be the difference between finishing in the money and just finishing. Even slight changes in air density, water grains, and density altitude can dramatically affect a machine’s
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Supplier: Lake Shore Cryotronics, Inc.
Description: Designed to meet the demanding needs of the permanent magnet industry, the Lake Shore Model 425 gaussmeter provides high-end functionality and performance in an affordable desktop instrument. Magnet testing and sorting have never been easier. When used in combination with the
- Device Type: Gaussmeter (Tesla Meter)
- Form Factor: Desktop / Module
- Measurement Features: Magnitude Measurement
- Number of Axes: 1
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It is becoming increasingly important to save energy while reducing harmful emissions when using a pollution control device such as a flare stack. In Refineries and Chemical Plants, proper flare stack design is essential to handle multiple waste streams for maximum destruction performance (read more)
Browse Gas Instruments Datasheets for Control Instruments Corp. -
MicroLEDs continue to demonstrate performance advantages for displays, ushering in a new generation of backlit and direct-view illumination technology. These inorganic emissive elements offer many benefits over other display technologies including high brightness and contrast, wide (read more)
Browse Color Meters and Appearance Instruments Datasheets for Radiant Vision Systems -
Dewpoint measurement is critical at two points in the process:- Measuring Moisture/Dewpoint after the dryer provides a warning if the dryer malfunctions, protecting the generator from damaging condensate. Measuring the Moisture/Dewpoint of the Nitrogen (read more)
Browse Hygrometers and Humidity Measurement Instruments Datasheets for Alpha Moisture Systems -
The Alpha Moisture Systems' AMT-Ex Dewpoint Transmitter is a proven and reliable solution for measuring trace moisture in Hydrogen gas applications. Through the utilization of ultra high capacitance technology, this dew point transmitter achieves unmatched accuracy and (read more)
Browse Hygrometers and Humidity Measurement Instruments Datasheets for Alpha Moisture Systems -
The quality of filtration and dryness required of the air supply differs for each application. But generally, compressed air can be classified in terms of dryness and cleanliness: Shop Air, Plant Air, and Instrument Air. (Not standard industry terms). Compressed air is dried in three (read more)
Browse Hygrometers and Humidity Measurement Instruments Datasheets for Alpha Moisture Systems -
Solartron’s Orbit® Network can be used to connect multiple sensors together to check complex shapes, such as a knee prosthesis. For checking the knee joint (read more)
Browse Dimensional Gages and Instruments Datasheets for Ametek Solartron Metrology -
misalignments that can lead to premature failure. Other tools measure temperature, lubrication and noise levels. All or a combination of these tools, when used as part of a regular maintenance program, can result in benefits. VibChecker is used to trend vibration levels on fans, motors, pumps (read more)
Browse Vibration Measurement Instruments and Vibration Analyzers Datasheets for Quality Bearings & Components -
Pratt & Whitney Measurement Systems Pratt & Whitney Measurement Systems is a global supplier of ultra-precision metrology instruments, inspection gaging systems, and length measuring (read more)
Browse Dimensional Gages and Instruments Datasheets for Pratt & Whitney Measurement Systems, Inc. -
ZYGO is the technology and application support leader in heterodyne displacement interferometry, offering complete solutions and support for your OEM metrology application. ZYGO's technologies and OEM products have been field proven over many years of use in leading-edge production facilities (read more)
Browse Semiconductor Metrology Instruments Datasheets for Zygo Corporation -
Solartron sensor to almost any output device via Orbit®. The Orbit® network is based on a proven and rugged RS485 multi-drop network running at 1.5m Baud. To build one, you stack any number of digital modules together via use of “T-connectors.” Interface to PLC (read more)
Browse Dimensional Gages and Instruments Datasheets for Ametek Solartron Metrology
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The Challenges of Measuring Flare Gas
and to allocate taxes, fines and other fees. Measuring the flow rate of flare gas is challenging because a flare is not a pure gas, but a mixture of many different gases. In order to correctly measure the flow rate of the constituent gases, the composition of the flare must be known. This is typically
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Single In-line Sensor for Viscosity, Density, and Temperature
Cambridge Viscosity Announces ViscoDense. The new ViscoDense (R) is a breakthrough 3-in-1 instrument providing instantaneous in-line measurement of viscosity, density, and temperature in one single device. This device capitalizes on Cambridge's patented driven-piston technology for measuring
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LVDTs to Measure Liquid Level with a Float
Typically, liquid level measuring devices use the column height times the liquid density, which is pressure, to measure relatively large liquid levels.
- Promass Measures Ingredients with Wide Range of Viscosity and Density
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Why Watt Density Matters When Choosing Heating Elements
Watt density refers to the measure of power from a heating element divided by the heated surface area of the element itself. Of course, that 's just the surface (excuse the pun) of this concept. It has major implications when choosing a heater and its components (i.e., flanged elements). This post
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How Do You Measure Magnetic Fields In Gauss?
The traditional CGS units for measuring magnetic fields are Gauss and Oersted. Magnetic flux density is measured in Gauss, while magnetic field intensity is measured in Oersted.
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Application Note - Measuring High Output Voltage Regulator Noise
degradation of the performance of the end load circuitry. Since many of these application circuits modulate input power supply noise into the output of phase noise or clock jitter, it is most useful to measure the power supply noise using a spectral noise density plot.
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Ask the Expert: Measuring the Viscosity of an Oil
on gravity. The two techniques are differentiated by fluid density.
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Federal Register > Wednesday, December 1, 2010 > [75 FR 74774] Mandatory Reporting of Greenhouse Gases: Additional Sources of Fluorinated GHGs
(m) Calibrate all flow meters, weigh scales, and combinations of volumetric and density measures using monitoring instruments traceable to the International System of Units (SI) through the National Institute of Standards and Technology (NIST) or other recognized national measurement institute.
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Federal Register > Monday, April 12, 2010 > [75 FR 18652] Mandatory Reporting of Greenhouse Gases: Additional Sources of Fluorinated GHGs
(k) Calibrate all flow meters, weigh scales, and combinations of volumetric and density measures using monitoring instruments traceable to the International System of Units (SI) through the National Institute of Standards and Technology (NIST) or other recognized national measurement institute.
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Code of Federal Regulations > Title 40 - Protection of Environment > Clean Air Act / Air Programs (CAA) > [40 CFR Part 98] Mandatory Greenhouse Gas Reporting
(m) Calibrate all flow meters, weigh scales, and combinations of volumetric and density measures using monitoring instruments traceable to the International System of Units (SI) through the National Institute of Standards and Technology (NIST) or other recognized national measurement institute.
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Residual Energy Spectrum of Solar Wind Turbulence
It should be pointed out that a small part of the differ- ence between the MHD and kinetic normalizations is due to the different instruments used to measure particle density (3DP/PESA-L for the MHD normalization and SWE/FC for the kinetic normalization …
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ISA 77.42.01 - Fossil Fuel Power Plant Feedwater Control System - Drum Type
If the instruments used to measure drum level are sensitive to density variation, then density compensation techniques shall be employed.
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Quick measurement of hematocrit and erythrocyte sedimentation-rate by means of a density tracking method
The instrument makes use of the high resolution density measurement according to the mechanical oscillator technique described by Kratky et al. [11].
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NIST Manuscript Publication Search
A presentation included an introduction to an instrument using electrical imepdence for measurement of the density of road pavement.
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Special Section: Flow & Level: Boiler drum level control - ISA
When a differential pressure transmitter is used to measure drum level and the instruments used are sensitive to density variation, density compensation techniques must be employed.