Cooper LXT 981 User Manual
LXT 980 and LXT 981
TORQUE SENSOR
USER’S GUIDE
www.cooperinstruments.com
PH: (540) 349-4746 • FAX: (540) 347-4755
CONTENTS
1.0 INTRODUCTION ..................................................................................................................................................................................... 3
2.0 MODEL LXT 980 / LXT 981 ................................................................................................................................................................... 3
3.0 TECHNICAL CHARACTERISTICS OF THE SENSOR ................................................................................................................. 4
4.0 VERSIONS AND ORDE R OPTI ONS ................................................................................................................................................... 5
5.0 AVAILABLE OPTIONS .......................................................................................................................................................................... 6
5.1 Optional Signal Outputs ...................................................................................................................................... 6
5.2 Optical angle sensor ........................................................................................................................................... 6
6.0 DIMENSIONS ............................................................................................................................................................................................ 7
7.0 CONNECTION PLAN .............................................................................................................................................................................. 9
8.0 OPERATING INSTRUCTIONS ............................................................................................................................................................. 9
8.1 Field of Application .............................................................................................................................................. 9
8.2 Scope of Delivery ................................................................................................................................................ 9
8.3 Installation and Removal ................................................................................................................................... 10
8.4 Offset Adjustment ............................................................................................................................................. 10
8.5 Interface Description ......................................................................................................................................... 10
8.6 Operation (in regular case or in optimal case) .................................................................................................. 10
8.7 Irregular Operation, Measures against Disturbance ......................................................................................... 10
8.8 Commissioning ................................................................................................................................................. 10
8.9 Service / Maintenance ...................................................................................................................................... 11
8.10 Disposal .......................................................................................................................................................... 11
8.11 Handling and Transport .................................................................................................................................. 11
8.12 Precautions ..................................................................................................................................................... 11
9.0 CALIBRATION AND ACCURACY CLASS .................................................................................................................................... 11
10.0 WARRANTY REPAIR POL ICY ...................................................................................................................................................... 13
CF 189 ii Rev. E; Dec. 12, 2011
1.0 INTRODUCTION
With this torque sensor the effective torque on the gauge bar can be measured bi-directionally
independent from rotational speed. The sensor is delivered as a complete unit with corresponding
connecting cable and key stones. The transmitting shaft, the contact-free signal pick-up and the analog
signal processing are integrated into the sensor structure. No external amplifier is needed. Based on
magnetic field and therefore completely non-contact measurement principle, the sensor works totally
maintenance-free over a wide temperature range.
• Torque sensor with non-contact principle
• Measurement range from 0 to 2000Nm bi-directionally
• Accuracy classes
o Series 3000: 0,2
o Series 4000: 0,1
• High tolerable dynamic loads
• Maintenance-free operation
• Torque measurement up to 10.000 rpm
• Integrated signal conditioning
• Optional angle sensor
• Optional sensor outputs PWM, 4...20mA
• Temperature range from -30°C to +85°C
2.0 MODEL LXT 980 / LXT 981
Model
LXT 980 / LXT 981
Shaft Unit Bi-directional (+/-) Bi-directional (+/-) [rpm]
15 mm
15 mm
25 mm
25 mm
40 mm
40 mm
[Nm]
[ft-lb]
[Nm]
[ft-lb]
[Nm]
[ft-lb]
[Nm]
[ft-lb]
[Nm]
[ft-lb]
[Nm]
[ft-lb]
Nominal-Torque Max. overload Rotational Speed
50 150
37 111
100 150
74 111
250 750
184 553
500 750
369 553
1000 3000
738 2213
2000 3000
1475 2213
10.000
10.000
8.000
8.000
5.000
5.000
CF 189 3 Rev. E; Dec. 12, 2011
3.0 TECHNICAL CHARACTERISTICS OF THE SENSOR
LXT 980 LXT 981
No.
Accuracy class1) 0.1 0.2
Unit Value
1 Linearity deviation incl. hysteresis
2 Rotational Signal Uniformity (RSU)
3 Repeatability
%ME*
%ME*
%ME*
Output signal in general Unit Value
4 Frequency range, -3dB point, Bessel
Hz 0…2500
characteristics
5 Analog signal V 0… 10
6 Signal at torque +/- Zero2) V ≈ 5
7 Signal at positive nominal torque V ≈ 9
8 Signal at negative nominal torque V ≈ 1
9 Calibration parameter mV/Nm ≈4000mV / Measurement range
10 Output resistance Ω 62
Effect of temperature Unit Value
11 Zero point drift over temperature %/10K <0.2
12 Signal drift over temperature within
operational temperature range
Power supply Unit Value
3)
%/10K <0.5
13 Supply voltage VDC 11…28
14 Current consumption (max.) mA 150
15 Start-up peak mA < 200
16 Absolute max. supply voltage VDC 30
General information Unit Value
17 Degree of protection acc. to EN 60529 IP 50 (64 if required)
18 Reference temperature °C +15…+35
19 Operational temperature range °C -30…+85
20 Storage temperature range °C -30…+100
Nominal torque M (bi-directional) Nm 50 100 250 500 1000 2000
21 Weight g 1280 2030 5800
22 Moment of inertia round shaft kg*mm2 5,9 59,5 626
%ME: related to a full scale measurement range
1) The accuracy class implies that taken separately both the linearity deviation as well as the rotational
signal uniformity is either lower than or equal to the value of the accuracy class. The accuracy class is
not to be identified with the classification following DIN 51309 or EA-10/14.
2) Zero point can be set to 5V by pressing the Tera-button.
3) The factor of transmission declines linearly up to a maximum of 0.5% / 10K with rising temperature
due to the reduction of the elasticity.
<± 0.2 <± 0.1
<± 0.2 <± 0.1
<± 0.5 <± 0.5
CF 189 4 Rev. E; Dec. 12, 2011
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