Omega Products TQ504 Installation Manual

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User’s Guide

TQ504

Torque Transducer

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USA: One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford CT 06907-0047

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Canada: 976 Bergar

Laval (Quebec) H7L 5A1
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Servicing Europe:

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Czech Republic: Rudé armády 1868, 733 01 Karviná 8

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France: 11, rue Jacques Cartier, 78280 Guyancourt, France

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Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

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United Kingdom: One Omega Drive, River Bend Technology Centre

ISO 9002 Certified Northbank, Irlam, Manchester

M44 5BD United Kingdom
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Toll Free in United Kingdom: 0800-488-488
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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

INDEX

1. Applications and typical attributes ............................................... Page 1

2. Description of the measurement system ...................................... Page 1

2.1 Mechanical design ................................................................. Page 1

2.2 Electrical design ..................................................................... Page 2

2.3 Angle-of-rotation transducer ............................................... Page 3

3. Electrical connection of the torque transducer ............................ Page 4

3.1 Connector pin assignments .................................................. Page 5

3.1.1 Signals, angle outputs ........................................................... Page 6

3.2 Laying of the output signal cables ...................................... Page 6

3.3 Placement of conductors in cable ........................................ Page 6

4. Mechanical installation of the torque transducer........................ Page 8

4.1 Suggestions for installation .................................................. Page 8

5. Mechanical calibration ..................................................................... Page 9

5.1 Assembly of a simple calibrating setup ............................ Page 10

5.2 Sample calculation of lever arm length............................. Page 10

5.3 Electrical calibration ............................................................. Page 11

6. Maintenance...................................................................................... Page 11

7. Troubleshooting guide for transducer shaft............................... Page 12

See Data Sheet for technical specifications

TQ504 Torque Transducer

i

1. Applications and typical attributes

• Torque transducer with inductive angular position measurement system.

• Measurement of constant and variable torques.

• Torque measurement on a rotating shaft.

• For laboratory, production and quality assurance applications.

• Built- in instrument amplifier.

• Built- in angle-of-rotation transducer.

2. Description of the measurement system

2.1 Mechanical design

• The transducer consists of a stator through which a bearing-mounted shaft
passes.

• A certain length of the shaft is utilized to convert the torque into a proportional
torsional angle.

• This torsional angle or angle of twist is measured between the two ends of this
shaft length by an inductive (wave-form) angular position measurement
system.

• The inductive angular position measurement system converts the angle of
twist into a proportional electrical signal.

TQ504 Torque Transducer

1

Bearing

Angular
Sensor

Pulsedisk Stator Inductive (wave-

Rotary

transformers

form) angular

position measure-

ment system

Bearing

Torsion

length

• The electrical power for operation of the inductive angular position
measurement system, which rotates along with the shaft, is provided by means
of a rotary transformer.

• The electrical output signal, which is proportional to the torque, is transferred
to the stator by a second rotary transformer.

• The connection box on the stator contains the electronics, the power supply
unit, and the instrument amplifier.

2.2 Electrical design

The built-in electronics comprise the following functional groups:

• Oscillator for generation of the AC input voltage

• Preamplifier for the output signal

• Phase-sensitive rectifier for conversion of the AC output signal into a DC
voltage

• Output amplifier

TQ504 Torque Transducer

2

Mechanical part
of transducer

Inductive (wave­form) angular

Oscillator

120kHz

position measure­ment system

Preamplifier

Output
amplifier

Rotary transformers Phase-sesitive

rectifier

2.3 Angle-of-rotation transducer

Schematic of angle-of-rotation measurement system

1. Rotating shaft

2. Encoder disk

3. Double-arm photoelectric barrier

4. Open-collector output (external pull-up resistor required)*

Features:

• 360 slots in the encoder disk

• Two double-arm photoelectric barriers 90° apart.

• Number of pulses generated proportional to angle of rotation.

* The ohmic value of the resistor depends on the maximum speed of rotation and
the cable length (e.g. 1500 rpm and a 4 m cable, R=3.3kΩ).

TQ504 Torque Transducer

3

+

+5

V

+5

V

1

3

E

3

B

4

0

V

5V

V

0

2

intern

+5

V

4