Field assistance engineers wish a variety of load cells spanning the separate ranges needed to calibrate their customers' systems. They may also wish the assortment to guide a wide range of force measurements for a single testing application. The challenge begins when the engineer needs to change the load cell that is linked to his instrument before he can continue. When the new cell is linked to the instrument, the proper calibration factors need to be installed in the instrument.
Avoiding user-error is a major challenge with by hand data entry or with requiring the engineer to go for from a database of stored calibration parameters. Loading the wrong parameters, or even worse, corrupting the existing calibration data, can lead to erroneous results and high-priced recalibration expenses. Instrumentation that automatically identifies the load cell being attached to it and self-installing the permissible calibration data is optimal.
What is Transducer Electronic Datasheet? A Transducer Electronic Data Sheet (Teds) shop transducer identification, calibration and revising data, and manufacturer-related data in a uniform manner. The Ieee Instrumentation and determination Society's Sensor Technology Technical Committee developed the formats which contain common, network-independent transportation interfaces for connecting transducers to microprocessors and instrumentation systems.
With Teds technology, data can be stored inside of a memory chip that is installed inside of a Teds-compliant load cell. The Teds proper is complicated. It specifies a huge number of detailed electronic data templates with some degree of standardization. Even when using the data templates, it is not guaranteed that separate vendors of Teds-compliant systems will justify what data goes into the electronic templates in the same way. More importantly, it is not apparent that the calibration data that is needed in your application will be supported by a single vendor's Teds unit. You must also be sure that you have a way to write the Teds data into the Teds-compatible load cell, either through a Teds-compatible instrument that has both Teds-write and Teds-read capabilities, or through the use of some other, likely computer based, Teds data writing system.
For precision applications, such as calibration systems, it should also be noted that calibration data that is stored in the load cell is the same no matter what instrument is linked to it. Supplementary recompense for the instrument itself is not included. Matched systems where a field assistance calibration group might be attaching separate load cells to separate instruments can gift a problem.
Electro Standards Laboratories (Esl) has developed the Teds-Tag auto identification ideas which retains the exciting highlight of self identification found in the Teds proper but can be implemented naturally on any load cell and, when linked to the Esl Model 4215 smart meter or CellMite exciting digital signal conditioner, becomes transparent to the user. Multiple load-cell and Multiple instrument matched pair calibrations are also supported. This can be a significant benefit in precision applications such as field calibration services.
With the Teds-Tag system, a small and uncostly electronic identification chip is located in the cable that extends from the load cell or it can be mounted within the cell housing. This chip contains a unique electronic serial number that can be read by the Esl Model 4215 or CellMite to identify the cell. The cell is then linked to the unit and a proper calibration procedure is performed. The instrument automatically shop the calibration data inside the unit itself along with the unique load cell identification number from the microchip. Whenever that cell is reconnected to the instrument, it automatically recognizes the cell and self-installs the proper calibration data. True plug-and-play doing is achieved. With this ideas the calibration data can automatically contain recompense for the single instrument so that high precision matched systems can be realized. Moreover, if the cell is moved to someone else instrument, that instrument will recall the calibration data that it has stored internally for that load cell. The Esl instruments can store Multiple load cell calibration entries. In this way, Multiple load cells can form a matched calibration set with Multiple instruments.
Any load cell can be indeed made into a Teds-Tag cell. The electronic identification chip, Dallas Semiconductor part number Ds2401, is effortlessly ready from distributors or from Esl. The chip is very small, development it easy to fit into a cable hood or cell housing.
Both the Esl Model 4215 smart strain gauge indicator and the CellMite exciting digital signal conditioner are linked to load cells via a Db9 connector with selfsame pin outs. The electronic identification chip does not interfere with the cell's signals. Pin 3 of the Ds2401 is not used and can be cut off if desired. naturally connecting pins 1 and 2 from the Ds2401 to pins 8 and 7, respectively, of the Esl Db9 connector will enable plug-and-play operation.
When using off-the-shelf load cells, it is often convenient to uncover the Ds2401 in the hood of the cable. The cell comes with a constantly mounted cable that protrudes from the cell housing. At the end of the cable, strip back the insulation from the personel wires and solder the wires into the Db9 connector. The Ds2401 is soldered over Db9 pins 7 and 8, and fits within the connector's hood. For a few dollars in parts and a straightforward cable termination procedure, you have taken a proper load cell and transformed it into a Teds-Tag plug-and-play unit.
For applications in which way to the load cell and cable is restricted, an in-line tag identification module can be naturally constructed. A straight through in-line cable adapter can join the Ds2401 electronic tag chip. In this application, the cable adapter is indeed located in series with the load cell cable before it is plugged into the Esl instrument. It is also inherent to use this technique in applications where separate calibrations might be required on the same load cell. The user may have a single load cell and instrument, but can change which calibration is auto-selected by naturally changing the in-line cable adapter. Since each cable adapter has a separate tag identification chip, the Esl instrument will associate a separate calibration data set with each in-line adapter. This might be useful, for example, if a precision 6-point linearization of the load cell is required in two separate operating ranges of the same load cell.
Now that the load cell has been converted to a Teds-Tag unit, it can be linked to the Esl Model 4215 smart strain gauge indicator or a CellMite exciting digital signal conditioner. The very first time it is connected, a proper calibration procedure is performed to initialize the cell's calibration data in the instrument. The Esl instruments keep a variety of business proper calibrations including mV/V, shunt, 2-point, or multiple-point calibration. The instrument then automatically detects the proximity of the Teds-Tag load cell and matches it with its calibration data. From this point forward, the ideas is wholly plug-and-play. Typical start up is now:
1. Plug load cell into the Esl instrument.
2. Turn on the power.
3. You're done.
After they've been initially calibrated on the instrument, changing load cells is done by naturally plugging the new cell into the instrument and turning on the power. That's it.
The Esl Model 4215 is a calibration potential strain gauge indicator that has internal nonvolatile storage for the calibration data of 25 load cells. Model 4215 combines force channels, encoder position channels, print capabilities, and Rs-232/485 serial communications into a versatile platform.
The versatile Model 4215 is used with tensile testers, strain gauges, extensometers, torque transducers, pressure sensors and position encoders. The Model 4215 features a bipolar range +/- 999,999 display, 24-bit resolution, nonlinearity of 0.005%, and auto load cell identification and setup for 25 load cells. Front panel shunt calibration with two selectable resistors is standard.
Menu buttons have alternate functions for setup menus. Programmed operations contain peak hold and tracking, programmable math and function channels, programmable limits, the variety of engineering units, position and velocity indication, and user-parameter inputs along with menu scrolling and auto zero. Quad limits output: independent, isolated solid state relays control Ac or Dc signals. The unit features six user-selectable filters. There is a tri-state limit display of On, Off and Disabled. Model 4215 includes a quadrature encoder channel for position and rate readout.
The Model 4215 is dataView software ready for graphical user interface and association to a Pc. The dataView software features include: full function point-and-click graphical user interface; plug and play operation, full speed data acquisition and plotting; data export into spread sheets; store and recall data files; create and retrieve configuration files; and article generation.
The CellMite is a ageement digital signal conditioner that connects directly to a proper strain gauge based load cell, extensometer or pressure sensor and simultaneously generates a serial digital output for association to a Pc as well as a +/-10V analog output. It has internal nonvolatile storage for the calibration data of 3 load cells. It can be used with Gui software or standalone to replace analog strain gauge signal conditioners. When it identifies a Teds-Tag load cell, it not only auto-installs the corresponding calibration data needed to take measurements from the cell, it also auto-installs gain and offset factors for its 16-bit scalable analog output. The voltage range and offset of the analog output is automatically changed to match the corresponding load cell. This is a distinguished feature. Using the CellMite in this way is like having Multiple analog load cell signal conditioners all in one, and having them automatically removed, installed, and matched with a load cell, all without any user intervention.
The CellMite compensates for transducer nonlinearities using its integrated 6-point calibration potential not found in proper signal conditioners. Its multi-drop Rs232 serial port, unit addressing capabilities, and straightforward command set allow for association of Multiple units in a serial network configuration.
CellMite features the potential to go for in the middle of three transducers, multi-point and mV/V calibration, remote sense excitation, and a 24-bit internal resolution. Functions contain tare, peak and valley. The engineering units supported include: in, cm, mm, %, Lb, Kg, N, mV/V and user-defined.
The CellMite operates with either CellView Lite Gui Software, CellView Multi-Unit Display Gui Software or with software drivers. The CellView software features a turnkey data acquisition system. Data, calibration, and sensor test data can be saved and exported to spreadsheets. The software allows the operator to setup a test to start and/or stop automatically with user-selectable trigger events and delayed triggering.
The CellMite is ideally distinguished for in-situ transducer conditioning and distributed process measurements. CellMites are addressable for a Serial Network. The software guides the user through sensor calibration and through adding and removing networked units. The CellMite force determination units can be networked along with the CellMite Lvdt Ac excitation digital signal conditioners.
Electro Standards offers a family of CellMites including single and dual-channel units, encased, Din rail, and board configurations. Units are ready with and without displays. A CellMite is ready for wireless transportation up to 1500 feet. A CellMite is also ready with both Lvdt and force determination capabilities.
Electro Standards Laboratories has expertise on load cell electronics, digital signal conditioning, data acquisition systems, and linked applications. A knowledgeable force of sales engineers is ready to assist customers with the proper products offered on the Esl Website and with custom designs for exact applications. The company has been in company for over 30 years designing productive engineered solutions.
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