Related Manuals for Kistler 93 1C Series
Summary of Contents for Kistler 93 1C Series
- Page 1 Instruction Manual Piezoelectric Load Cells Type 9301C … 9371C 9301C_002-994e-09.21...
- Page 3 Information in this document is subject to change without notice. Kistler reserves the right to change or improve its products and make changes in the content without obligation to notify any person or organization of such changes or improvements.
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Page 4: Table Of Contents
Piezoelectric Load Cells, Type 9301C ... 9371C Contents Introduction ............................ 3 Important Notes ..........................4 For Your Safety ........................4 Notes on Handling the Instrument ..................5 Tips on the Use of These Operating Instructions ..............6 ... -
Page 5: Introduction
It will help you with the installation, maintenance, and use of this product. To the extent permitted by law Kistler does not accept any liability if this instruction manual is not followed or products other than those listed under Accessories are used. -
Page 6: Important Notes
Piezoelectric Load Cells, Type 9301C ... 9371C Important Notes It is essential for you to study the following information, compliance with which is for your personal safety during the work and will ensure long, fault-free operation of the instrument. 2.1 For Your Safety ... -
Page 7: Notes On Handling The Instrument
Important Notes 2.2 Notes on Handling the Instrument The load cell must only be used under specified environmental and operating conditions The insulation resistance is of decisive importance in piezoelectric sensors; it must be approximately 10 Ω (but at least 10 Ω) ... -
Page 8: Tips On The Use Of These Operating Instructions
Kistler Instrument sales office for return instructions. 2.1 Software Upgrades and Updates Kistler may from time to time supply upgrades or updates for embedded software. Such upgrades or updates must always be installed. Kistler declines any liability whatsoever for any direct or... -
Page 9: General Description Of The Instrument Text
General Descripti General Description of the Instrument Text 3.1 What is the Purpose of a piezoelectric load cell? The piezoelectric load cell is used to measure dynamic or quasi-static tractive forces and pressures. The force trans- ducer is characterized by high rigidity and thus has a high natural frequency. -
Page 10: Functional Principle
Piezoelectric Load Cells, Type 9301C ... 9371C Machine tools Monitoring of presses, stamping embossing and welding machinery Force measurements at longitudinal guides General machine building Monitoring of supporting forces (oscillating forces) on machinery, mounted on damping elements ... -
Page 11: Construction Of The Piezoelectric Load Cell
General Description of the Instrument Text 3.3 Construction of the Piezoelectric Load Cell The load cell consists of a load washer mounted under high preload between a preloading bolt and a nut. This preload is necessary for measurement of the tractive forces. -
Page 12: Assembly, Installation And Initial Start-Up
Piezoelectric Load Cells, Type 9301C ... 9371C Assembly, Installation and Initial Start-up 4.1 Important Notes Piezoelectric load cells of Types 9301C ... 9371C are precision instruments which must be carefully handled if their inherent accuracy is to be maintained in a useful state. You should therefore comply with the following notes: ... - Page 13 Assembly, Installation and Initial Start-up Fig. 4: Fitting load cells A load cells is fitted using fittings with appropriate outer threads or screws. When firmly tightening a screw connection, ensure when holding the force transducer that the hexagon wrench is always applied close to the fastening side.
- Page 14 Piezoelectric Load Cells, Type 9301C ... 9371C Fig. 6: Installation example of a force transducer Wherever possible, keep connecting cable permanently connected to the load cell Install the connecting cable so that it cannot shear off or be ripped out under working conditions Seite 12 9301C_002-994e-09.21...
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Page 15: Standard Wiring And Cabling Of The Measuring System
Assembly, Installation and Initial Start-up 4.3 Standard Wiring and Cabling of the Measuring System The electrical charges (pC) yielded by the sensor element are converted by charge amplifiers into proportional voltages which can be indicated, recorded or further processed by standard instruments. Compliance is required with the following notes when connecting cables to the measuring system: ... - Page 16 Piezoelectric Load Cells, Type 9301C ... 9371C The following drawing shows the elements required for connecting a load cell to a charge amplifier. Fig. 7: Connecting a load cell to a charge amplifier Cable Type 1631C... is available in various lengths. Types 1603B...
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Page 17: Various Mounting Possibilities, Force Introduction
Assembly, Installation and Initial Start-up 4.4 Various Mounting Possibilities, Force Introduction Fig. 8: Mounting examples; various types of force Introduction The piezoelectric load cell can measure tensile and compressive forces in the longitudinal axis of the element. Bending moments, torsional moments as well as shear forces should be avoided as far as possible. - Page 18 Piezoelectric Load Cells, Type 9301C ... 9371C Fig. 9: Mounting examples of a load cell in a hydraulic chucking device. Monitoring of tensile and compressive forces Fig. 10: Mounting with force distributing cap Type 9500A... and flange Type 9501A... Seite 16 9301C_002-994e-09.21...
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Page 19: Operation
Operation Operation 5.1 Range Selection It is advisable to use charge amplifiers with sensitivity adjustment with load cells Type 9301C ... 9371C. Set the sensitivity according to the data in the calibration certificate. The output voltage is then adjusted directly to the value corresponding to the scale selected (...N/V). - Page 20 Piezoelectric Load Cells, Type 9301C ... 9371C a Set the amplifier to Reset. Select the range for F as follows: 2 • 10 N/V (amplifier to Long Time Constant) b Switch the amplifier to Operate c Introduce force Fz (Start machine tool) d After reading and/or recording the force, switch the amplifier back to Reset to dissipate the charge corresponding to Fz...
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Page 21: Useful Frequency Range
Operation 5.3 Useful Frequency Range Piezoelectric load cells have, like all piezoelectric sensors, very little damping. Measuring without excessive errors is possible up to about a third of the natural frequency. The lower frequency limit is determined by the drift of the charge amplifier and the quality of the insulation. -
Page 22: Temperature Influences
Piezoelectric Load Cells, Type 9301C ... 9371C 5.4 Temperature Influences The temperature coefficient of sensitivity (change in sensitivity with temperature in which the entire load cell is at the same temperature) is negligible. On the other hand, temperature changes during the measurement result in an temperature error signal in the form of a zero drift. -
Page 23: Maintenance
Clean the plug connector of the sensor or connecting cable regularly with an extremely clean cleaning agent such as the Kistler cleaning and insulating spray Type 1003 or pure white gasoline 9301C_002-994e-09.21 Seite 21... -
Page 24: Rectifying Faults
Piezoelectric Load Cells, Type 9301C ... 9371C Rectifying Faults 7.1 Troubleshooting Listed below are typical faults and remedial measures. If you cannot clear the fault yourself, contact your Kistler distributor. Fault: No measuring signal at the output of the charge amplifier... -
Page 25: Defective Load Cell
If it appears that major repairs will be necessary, you will receive an estimate of the cost Kistler will try to repair your load cell in the shortest possible time and at minimum cost and to return it to you in an as new condition ... -
Page 26: Technical Data
Piezoelectric Load Cells, Type 9301C ... 9371C Technical Data Please see the technical data sheet (003-556) of the load cells 93x1C. Seite 24 9301C_002-994e-09.21... -
Page 27: Glossary
Cable capacitance The cable capacitance, and thus the length of the connecting cable, has no noteworthy influence on the measuring result when Kistler special cables and Kistler charge amplifiers are used. Calibrated range Measuring range or part of the measuring range for which the sensor has been calibrated. - Page 28 Piezoelectric Load Cells, Type 9301C ... 9371C In terms of electrical devices, it is a measure for the signal impact acting from a channel to the neighbouring ones. Degree of protection Protection of electrical equipment by suitable enclosures, covers etc. according to EN60529. The protection class is stated by IP (International Protection) followed by two digits.
- Page 29 Glossary Measurand Physical quantity, state or characteristic which is measured, e.g. force, torque, pressure etc. Measuring chain Interconnection of several individual components to meet measuring requirements. Measuring chains usually consist of sensors and amplifiers in conjunction with data acquisition, display, evaluation and recording equipment (e.g.
- Page 30 Piezoelectric Load Cells, Type 9301C ... 9371C within the object and/or for ensuring a rigid force application. quasistatic Describes the ability of Kistler sensors and charge amplifiers to undertake short-term measurements or DC-similar measurements. Range see "Measuring range" Scaling Output voltage per unit of the measurand at the analogue or monitor output of a charge amplifier..
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Page 31: Measurement Uncertainty
Laboratory charge amplifier 1 % FSO Industrial charge amplifier Higher accuracy can be achieved with the following procedures: Calibration in the Kistler factory Calibration with charge amplifier Type 5395A Restriction of the temperature range Random errors, precision, reproducibility... -
Page 32: Linearity
Errors due to zero drift caused by influences changing with time, such as the temperature, are thus basically excluded. With Kistler piezoelectric measuring chains, a typical repeatability within 0,1 % FSO can be assumed. 9.3 Linearity... - Page 33 Glossary x = measurand (reference) Q = sensor charge signal or output signal from the charge amplifier Q (x) = calibration curve, rising and falling s = slope of the best straight lines Best straight line: y = s x (with starting value for slope s) ...
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Page 34: Frequency Range
Piezoelectric Load Cells, Type 9301C ... 9371C 9.4 Frequency Range Because of their mechanical quality, piezoelectric sensors have very low damping. The useful frequency range is limited in the upwards direction by the increasing resonance rise. Key: f Measuring frequency Natural frequency Amplitude ratio The following approximate values apply to the amplitude... -
Page 35: Influence Of Temperature
Glossary In their dynamic behavior, piezoelectric sensors are superior to all other measuring methods. Their high rigidity results in the highest possible natural frequencies. Piezoelectric sensors are thus ideal for measuring measurands which change rapidly over time. Their dynamic behavior is thereby largely determined by the surrounding structure. - Page 36 Piezoelectric Load Cells, Type 9301C ... 9371C Temperature error of the zero point (static error) Temperature error [unit of the measurand/°C] is the greatest change to the output signal in a specified measuring range after a specific sensor temperature change, following which the sensor is again in thermal equilibrium with its environment.
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Page 37: Warranty
Warranty Temperature coefficient of sensitivity Change in the sensitivity, i.e. the slope of the best straight line, as a function of temperature. The temperature distribution in the sensor is assumed to be homogeneous, and in thermal equilibrium with the environment. The temperature coefficient of the sensitivity is typically only approx.
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