Norbar Catalogue 2019

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CALIBRATION BEAMS & WEIGHTS CALIBRATION BEAMS & WEIGHTS - PRINCIPLES OF OPERATION Norbar’s test beams are designed for the static calibration of torque transducers. They are ideally suited to Norbar’s transducers, but can be employed on other manufacturer’s equipment. Transducer Torque is generated by the application of a known force at a known radius from the centre of rotation of the torque transducer. The beams are designed with square drives machined to the top limit of ISO 2725. This minimises any play between the beam and the transducer. However, a combination of square drive tolerances, misalignment of fittings and elastic rotation of the transducer shaft inevitably cause the beam to rotate from the horizontal under load. Norbar’s radius ended beams are designed with a ±8° usable arc within which the calibration accuracy is unaffected. 1m Applied torque in this example is 100 N·m 100 N 8° 8° 8° 8° Additionally, the beams are designed to apply load on a vertical plane which cuts through the square drive inside the transducer. This minimises bending moments on the transducer and for safe operation, ensures that the beam will not fall out of the transducer. Gravitational Effects It is very important that the gravitational value for the laboratory is established. The effect of not doing this could be a variation in the force produced by the weight of perhaps 0.5% of reading. It is therefore strongly recommended that you establish the local value of gravity (g) for your Laboratory and use weights that have been calibrated at that gravitational constant. Norbar will supply weights calibrated to gravitational constants specified by the customer. However, if the customer does not specify a value for ‘g’ they will have been calibrated at an estimated gravitational constant for the customers’ location. Buoyancy Effects The Norbar system uses calibrated weights to generate a downwards force. This means that Archimedes' principle applies, ie. air pressure under the weights causes an upwards force. This reduces the effective force generated by the weights and therefore the mass must be increased to allow for this. Under standard conditions (i.e. air density 1.2 kg/m3 and 20° centigrade and working in conventional mass terms) the increase required is by a factor of 0.015%. Weights purchased from Norbar will already have this factor taken into account. Weights that are calibrated to standard procedures do not have this factor taken into account because the air buoyancy affects both sides of the mass balance and can be ignored. It is important that weights used for torque transducer calibration are adjusted for air buoyancy. It should also be noted that the double ended beam design employed by Norbar means that each half of the beam is balanced with regard to buoyancy of the beam. This is a significant advantage over single-arm counterbalanced systems. 119 enquiry@norbar.com | www.norbar.com
CALIBRATION BEAMS & WEIGHTS CALIBRATION BEAMS & WEIGHTS 9 METRIC - NEWTON METRE SIZES 21400 100 mm Torque Radius Disc (100 mm) 21429 0.5 - 60 Nm Radius Ended Beam (0.25 m) 21421 5 - 150 Nm Radius Ended Beam (0.5 m) 21427 50 - 500 Nm Radius Ended Beam (0.5 m) 21428 10 - 1,500 Nm Radius Ended Beam (1.0 m) 21842 500 - 5,000 Nm Free Standing Beam With the exception of 21842 all calibration beams are supplied in a protective wooden box. A UKAS accredited calibration certificate for the measurement of the torque radius is provided with each beam. 9 WEIGHTS FOR THE DISC 21400 21452.NAM Brass weight set to give 0.5 Nm 21450.NAM Brass weight set to give 1.0 Nm 21479.NAM Brass weight set to give 2.5 Nm 9 WEIGHTS FOR THE BEAM 21429 21476.NAM Cast iron weight set to give 5 Nm 21454.NAM Cast iron weight set to give 10 Nm 21458.NAM Cast iron weight set to give 50 Nm Q2343.NAM Cast iron weight set to give 60 Nm Model 100 mm Disc 0.25 m Beam 0.5 m Beam 0.5 m Beam 1 m Beam Free Standing Beam Part Number 21400 21429 21421 21427 21428 21842 Dimensions (mm) A 100 250 500 500 1,000 * 1,524 B max. 295 650 755 1,015 1,015 1,070 Weight (kg) 0.5 1.2 5.0 17.0 25.0 270.0 * A max. 9 WEIGHTS FOR THE BEAM 21421 21477.NAM Cast iron weight set to give 50 Nm 21458.NAM Cast iron weight set to give 100 Nm 9 WEIGHTS FOR THE BEAM 21427/21428 21459.NAM Cast iron weight set to give 250/500 Nm Q2344.NAM Cast iron weight set to give 400 Nm 21460.NAM Cast iron weight set to give 500/1,000 Nm 21483.NAM Cast iron weight set to give 500/1,000 & 1,500 Nm e.g. set 21459.NAM will give 250 Nm on a 21427 beam and 500 Nm on a 21428. 9 WEIGHTS FOR THE BEAM 21842 21469.NAM Cast iron weight set to give 5,000 Nm All weight sets come with traceable UKAS accredited calibration certificate. This requires the customer to provide the value for 'g' (local gravity) for the intended place of use when ordering. enquiry@norbar.com | www.norbar.com 120
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CATALOGUE 2019
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INTRODUCTION ABOUT NORBAR UNITED KI
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t l bf.ft lbf.ft lbf.f 60 50 0 4 N.
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INTRODUCTION INTRODUCTION TO TORQUE
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SCREWDRIVERS AND TORQUE WRENCHES TO
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SCREWDRIVERS AND TORQUE WRENCHES IS
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SCREWDRIVERS AND TORQUE WRENCHES NO
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SCREWDRIVERS AND TORQUE WRENCHES SL
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SCREWDRIVERS AND TORQUE WRENCHES PR
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SCREWDRIVERS AND TORQUE WRENCHES IN
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SCREWDRIVERS AND TORQUE WRENCHES CL
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SCREWDRIVERS AND TORQUE WRENCHES SP
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SCREWDRIVERS AND TORQUE WRENCHES LA
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HANDTORQUE® MULTIPLIERS HANDTORQUE
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HANDTORQUE® MULTIPLIERS TORQUE REA
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POWERED TORQUE TOOLS POWERED TORQUE
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POWERED TORQUE TOOLS EVOTORQUE®2 E
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POWERED TORQUE TOOLS EVOTORQUE®2 M
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POWERED TORQUE TOOLS EVOTORQUE® BA
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POWERED TORQUE TOOLS PNEUMATIC TORQ
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POWERED TORQUE TOOLS PNEUTORQUE® P
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Page 69 and 70: POWERED TORQUE TOOLS ET, ET2, EBT,
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Page 81 and 82: TORQUE MEASUREMENT TORQUE MEASUREME
Page 83 and 84: TORQUE MEASUREMENT TRUCHECK 0.1 - 2
Page 85 and 86: TORQUE MEASUREMENT PROFESSIONAL TOR
Page 87 and 88: TORQUE MEASUREMENT TORQUE TOOL TEST
Page 89 and 90: TORQUE MEASUREMENT SPARES FOR INSTR
Page 91 and 92: TORQUE MEASUREMENT STATIC TRANSDUCE
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Page 107 and 108: HYDRAULIC TOOL CALIBRATION FIXTURES
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Page 111 and 112: HARSH ENVIRONMENT INSTRUMENTS HARSH
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Page 119: CALIBRATION BEAMS & WEIGHTS CALIBRA
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Page 125 and 126: SPARES KITS SPARES KITS 8 TORQUE SC
Page 127 and 128: SPARES KITS SPARES KITS 8 NORTORQUE
Page 129 and 130: CALIBRATION SERVICES DECLARATION OF
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Page 133 and 134: CALIBRATION SERVICES OTHER CERTIFIC
Page 135 and 136: TERMS & CONDITIONS of delivery (or
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Norbar Catalogue 2019

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