Catalog excerpts
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OPERATION MANUAL Miniature Load Cell Model 8402
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In diesem Handbuch finden Sie alle Informationen, die Sie für die Inbetriebnahme und den Betrieb dieses Gerätes benötigen. This operation manual provides you with all information necessary for the set-up and operation of the instrument. Haben Sie wider Erwarten dennoch Probleme, hilft Ihnen der zuständige Produktingenieur weiter. Rufen Sie uns einfach an unter Tel. 07224/645-0 oder unter der auf dem Lieferschein angegebenen Telefon-Durchwahl. Gerne können Sie uns auch eine email mit Ihren offenen Fragen schicken. If, contrary to expectations, you face any problems with the operation of the...
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Technical Product information Commissioning, Function, Fitting Specifications Miniature Load Cell Model 8402 1. Introduction The load cells in the model 8402 series are primarily designed for the measurement of force in production equipment, using Newtons (N) as the unit of measurement. The local gravitational acceleration (g ≈ 9.81 m/s²) must be taken into account when determining masses. 2. Preparing for use 2.1 Unpacking Inspect the sensor carefully for damage. If you suspect that the unit has been damaged during shipping, notify the delivery company within 72 hours. Keep all packaging...
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Technical Product information Commissioning, Function, Fitting Specifications Model 8402 2.4 Storage The sensor must be stored under the following conditions only: • Note: Provided the storage conditions have been observed, no special steps need to be taken after storage and prior to commissioning. 3. Principle of operation The sensor operates with the aid of a spring element. The force to be measured deforms the spring element elastically. This deformation is transformed into an electrical signal by strain gauges. They, together with the spring element, constitute the measuring element of...
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Technical Product information Commissioning, Function, Fitting Specifications Model 8402 3.2 Mechanical design The spring element in the 8402 is implemented as a hollow compression body. F strain gauge Figure 1: the measuring element in the 8402 is formed by a compression body with strain gauges A key feature of the 8402 is its relatively compact design for its rated force. The combination of compact size and high spring constant ensures a high resonant frequency, allowing the 8402 to make rapid measurements. 3.3 Function of the strain gauge The electrical resistance of a wire rises with...
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Technical Product information Commissioning, Function, Fitting Specifications Model 8402 3.4 Strain gauge wiring In order to reduce undesirable influences on the measurement, the strain gauges in the load cells are connected as a Wheatstone bridge. Figure 3: illustrates this wiring in a simplified form. Full-bridge strain gage In addition to the four strain gauges shown here, compensation resistors to reduce the effect of temperature and balancing resistors to balance the bridge circuit are also incorporated. Depending on the sensor model, further resistors for the purpose of standardizing...
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Technical Product information Commissioning, Function, Fitting Specifications Model 8402 3.6 External forces Caution! Sensor will be damaged! Avoid vibrations, even if the loads caused by these vibrations are less than the rated maximum. Design your measuring system in such a way as to prevent these external forces. Note: External forces, acting on the sensor, adulterate the result materially. External forces here refer to any force that acts outside the sensor's axis of symmetry transverse forces, bending moments and twisting moments in particular. 3.7 Overload protection Compression...
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Technical Product information Commissioning, Function, Fitting Specifications T+49) njcaLin/^eUeei'eo Model 8402 4. Installation Caution! Risk of damage to sensor! The sensor cable contains components that affect the sensitivity of the sensor. Never shorten the sensor cable. 4.1 Surrounding mechanical parts and fastening 4.1.1 Adaptation Mounting surface A high quality measurement depends on a defined deformation of the measuring element under load. In order to be certain of excluding any unwanted deformations, the sensor must lie flat on the mounting surface. The mounting surface must...
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Technical Product information Commissioning, Function, Fitting Specifications Model 8402 Applying the force Apply the force in the center. This means that you must apply the force exactly along the axis of symmetry of the sensor. The force must act in a direction perpendicular to the sensor. Eliminate any lateral forces and torques. These are generated by an eccentric load, force applied at an angle and by friction. You can avoid friction by using parts with an adequate surface quality and hardness. Parts that are used to apply the force to the sensor must satisfy the following...
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Technical Product information Commissioning, Function, Fitting Specifications Model 8402 Position the sensor correctly on the mounting surface. Now apply the initial load. The sum of initial load and maximum measured load must be less than the rated load. When using a spring element to mount the sensor, an initial load is applied to hold the sensor in position. Adhesive bonding Note: If mounting the sensor in a recess as a means of centering and fixing the sensor, a minimum radial gap of 0.5 mm must be maintained around the sensor case. Connect the sensor in situ to a measuring instrument...
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Technical Product information Commissioning, Function, Fitting Specifications Model 8402 Screw fastening Since the sensor case and hence also the measuring element must not be loaded during mounting, a mounting plate fitted to the sensor flange provides a suitable fixing method. You can fasten this mounting plate to the mounting surface using up to three screws. Use screws of diameter M4 or smaller. A radial gap of 0.5 mm must be maintained between the measuring element and the mounting plate. Connect the sensor in situ to a measuring instrument and monitor the measurement signal while...
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