Durham Instruments

By: Durham Instruments  09-12-2011
Keywords: Data Acquisition

An accelerometer measures the acceleration it experiences relative to freefall. Single- and multi-axis models are available to detect magnitude and direction of the acceleration as a vector quantity, and can be used to sense orientation, vibration and shock.

Conveyor Belt Alignment Switch protects conveyor belts from damage due to belt misalignment or runoff. These controls are used in pairs with one switch placed on each side of the conveyor belt. Each unit can be equipped with two limit switches to produce signals indicating belt misalignment at two deviation points. Hinged Rub Block Door Assemblies are designed for quick and easy inspection of belts and replacement of worn rub blocks saving time and promoting regular maintenance inspections.

You need to maintain quality control in your lab equipment. Without Quality Control, your work is invalid and becomes a potential liability. We offer recalibration services for all products that we sell. Contact Roger Wetherall for details.

Calibration is the validation of specific measurement techniques and equipment. At the simplest level, calibration is a comparison between measurements-one of known magnitude or correctness made or set with one device and another measurement made in as similar a way as possible with a second device. The device with the known or assigned correctness is called the standard. The second device is the unit under test (UUT), test instrument (TI), or any of several other names for the device being calibrated. This section provides hardware used as a standard or in the calibration process.

Condition monitoring is the process of monitoring a parameter of condition in machinery, such that a significant change is indicative of a developing failure. It is a major component of predictive maintenance. The use of conditional monitoring allows maintenance to be scheduled, or other actions to be taken to avoid the consequences of failure, before the failure occurs. This section targets condition monitoring of rotating equipment.

Compact and accurate control potentiometers with digital displays, to replace traditional machine potentiometers.

Data acquisition is the sampling of the real world to generate data that can be manipulated by a computer. Sometimes abbreviated DAQ or DAS, data acquisition typically involves acquisition of signals and waveforms and processing the signals to obtain desired information. The components of data acquisition systems include appropriate sensors that convert any measurement parameter to an electrical signal, then conditioning the electrical signal which can then be acquired by data acquisition hardware. Acquired data are displayed, analyzed, and stored on a computer, either using vendor supplied software, or custom displays and control can be developed using various general purpose programming environments.

Digital panel meters are used to display an input signal, and measure current, voltage, and frequency. They are equipped with bright LED displays for display only or set point control options. Many panel meters also include alarm options as well as the ability to connect and transfer data to a computer.

Pulse encoders are a type of sensor used to feed back speed or position for rotational or linear movements. Encoders are often used on electrical motors in the paper and steel industries, cranes, robots and material handling systems as well as various types of measurement, testing and inspection systems. Some encoders are available with analog or digital outputs.

Measurement Specialties, Inc. designs and manufactures high performance multi-parametric physical property sensors that simultaneously and directly measure the viscosity, density, dielectric constant and temperature of oils, lubricants, fuels, refrigerants, coolants and other fluids. Our advanced sensors allow companies, OEM’s and asset reliability maintenance programs to proactively manage fluid change intervals to minimize asset downtime, maximize performance and profits, and protect the environment.

A stand-alone system that combines the key elements of shaft speed, belt alignment, and bearing temperature.

Humidity sensors from Measurement Specialties are designed to improve performance, reduce energy consumption, and increase safety. In any environment where temperature affects performance, compensating for humidity should also be considered. Typical applications for humidity sensors include automotive, appliances, HVAC, and medical.

Device used to monitor critical vibration levels in machinery, providing relay or NPN output to indicate a fault condition.

The Penny+Giles range of finger operated joystick controllers have been developed for the smooth, precise control of critical functions in a variety of industrial applications where a Human-Machine Interface (HMI) is required. Available in one, two or three axis configurations. Rugged hall effect and potentiometric joysticks are also available in one or two axes for the most challenging industrial environments.

Acuity laser measurement sensor and scanner products satisfy diverse dimensional measuring applications for industrial automation and advanced research. Acuity sensors use laser triangulation, time-of-flight or confocal chromatic displacement measurement principles for high-accuracy position measurement installations.

A position sensor is any device that permits position measurement. It can either be an absolute position sensor or a relative one (displacement sensor). Position sensors that measure linear measurement are said to be linear position sensors. Some position sensors available are: · Inductive Non-Contact Position Sensors · String Potentiometer (aka String Pot) · Linear variable differential transformer (LVDT) · Potentiometer · Capacitive transducer · Hall effect sensor · Proximity sensor · Grating sensor · Encoder · Piezo-electric transducer

A load cell is a transducer that is used to convert a force into an electrical signal. This conversion is indirect and happens in two stages. Through a mechanical arrangement, the force being sensed deforms a strain gauge. The strain gauge converts the deformation (strain) to electrical signals. A load cell usually consists of four strain gauges in a Wheatstone bridge configuration. The electrical signal output is typically in the order of a few milli-volts and requires amplification by an instrumentation amplifier before it can be used. Other types include piezo-electric load cells (useful for dynamic measurements of force.

A mass flow sensor responds to the amount of a gas flowing through a chamber containing the sensor. It is intended to be insensitive to the density of the fluid. Mass flow measures just what it says, the mass or weight of the gas flowing through the instrument. Mass flow (or weight per unit time) units are given in pounds per hour (lb/hour), kilograms per sec (kg/sec) etc. When your specifications state units of flow to be in mass units, there is no reason to reference a temperature or pressure. Mass does not change based on temperature or pressure.

Piezoelectric Film is an enabling transducer technology with unique capabilities. Piezo Film produces voltage in proportion to compressive or tensile mechanical stress or strain, making it an ideal dynamic strain gage. It makes a highly reliable, low-cost vibration sensor, accelerometer or dynamic switch element. Piezo Film is also ideally suited for high fidelity transducers operating throughout the high audio (>1kHz) and ultrasonic (up to 100MHz) ranges.

The fitting measurement is utilized in the fitting process and monitors your production processes in real time, directly during ongoing operations such as riveting, punching or press-fitting. The benefit is the consistent high quality of your products – because problems are identified immediately as they occur.

A pressure sensor measures pressure, typically of gases or liquids. Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. A pressure sensor usually acts as a transducer; it generates an electrical signal as a function of the pressure imposed. Pressure sensors are used for control and monitoring in thousands of everyday applications. Pressure sensors can also be used to indirectly measure other variables such as fluid/gas flow, speed, water level, and altitude.

A position sensor is any device that permits position measurement. It can either be an absolute position sensor or a relative one (displacement sensor). Position sensors that measure rotary measurement are said to be rotary position sensors. Some position sensors available are: · Inductive Non-Contact Position Sensors · Rotary variable differential transformer (RVDT) · Potentiometer · Hall effect sensor · Encoder

Signal conditioning means manipulating an analog signal in such a way that it meets the requirements of the next stage for further processing. Signal inputs accepted by signal conditioners include DC voltage and current, AC voltage and current, frequency and electric charge. Sensor inputs can be accelerometer, thermocouple, resistance thermometer, strain gauge or bridge, and LVDT or RVDT. Specialized inputs include encoder, counter or tachometer, timer or clock, relay or switch, and other specialized inputs. Outputs for signal conditioning equipment can be voltage, current, frequency, timer or counter, relay, resistance or potentiometer, and other specialized outputs. Signal conditioning can include amplification, filtering, converting, range matching, isolation and any other processes required to make sensor output suitable for processing after conditioning.

Software is used to obtain measurement data when used with measuring hardware, or to analyze & manipulate data after the measurement has taken place. Our powerful measurement software packages are the perfect solution for configuring, visualizing and analyzing your measurement - even for very large amounts of data. In addition, we offer software for test and design analysis, fatigue analysis and web-based analysis and collaboration.

Whether you need detection of critical speed, direction of speed, one or more relay outputs, speed to analog conversion, or a display of rate in user-units, we have a Speed Switch or Ratemeter system for your application; our systems are designed to safeguard and protect your machinery and operations in a wide range of industries.

Our range of strain gages comprises an extensive assortment of types for the most widely differing applications – from experimental stress analysis through transducer manufacturing. Additionally, HBM offers you all the necessary accessories and components for the installation of strain gauges.

TEDS is an acronym for Transducer Electronic Datasheet. It is a table of parameters that identify the transducer and are held in the transducer on a EEprom for interrogation by external electronics. It can be incorporated into the housings, cables or connectors of different kinds of transducers. It contains an electronic data sheet which lets you set up the measuring amplifier automatically.

Temperature sensors are instruments for measuring temperature. There are many types, designed to measure different temperature ranges to varying degrees of accuracy. Each makes use of a different physical effect of temperature.

An inclinometer or clinometer is an instrument for measuring angles of slope (or tilt), elevation or inclination of an object with respect to gravity. It is also known as a tilt meter, tilt indicator, slope alert, slope gauge, gradient meter, gradiometer, level gauge, level meter, declinometer, and pitch & roll indicator. Clinometers measure both inclines (positive slopes, as seen by an observer looking upwards) and declines (negative slopes, as seen by an observer looking downward).

A torque sensor or torque transducer is a device for measuring and recording the torque on a rotating system, such as an engine crankshaft or a bicycle crank. Static torque is relatively easy to measure. Dynamic torque, on the other hand, is not easy to measure, since it generally requires transfer of some effect (electric or magnetic) from the shaft being measured to a static system. Commonly, torque sensors or torque transducers use strain gages applied to a rotating shaft or axle. With this method, a means to power the strain gauge bridge is necessary, as well as a means to receive the signal from the rotating shaft. This can be accomplished using slip rings, wireless telemetry, or rotary transformers. Newer types of torque transducers add conditioning electronics and an A/D converter to the rotating shaft. Stator electronics then read the digital signals and convert those signals to a high-level analog output signal, such as +/-10VDC.

This sensor is used to measure pressure less than the atmospheric pressure at a given location.

The weighing systems primary function is to accurately weigh a target material such as production tank systems, truck scales or other commercial goods. Weighing systems utilize a load sensor (usually a strain gauge based load cell), cabling, junction box, a signal conditioning system and associated installation hardware.

Keywords: Data Acquisition

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