Cooper Instruments LXT970-17.5 Installation Manual

LXT 970/971 Non-Contact Torque Sensor

1.0 INTRODUCTION

The LXT 970/971 sensor has been designed to measure torque on static or rotating shafts bi-directional and in
real time. The sensor is delivered as a set including the connecting cable, shaft keys (if appropriate) and user
manual. The torque sensing shaft, the non-contact signal detector, and analog signal conditioning electronics
are integrated into the sensor housing. The torque sensor is characterized by very low power consumption,
internally amplified output voltage signal, long-term stability and a very good price-performance ratio.

2.0 CHARACTERISTICS

LXT 970 Series Model Number

Square Drive Round Drive

LXT 970-2.5 LXT 971-2.5
LXT 970-5.0 LXT 971-5.0
LXT 970-7.5 LXT 971-7.5

LXT 970-17.5 LXT 971-17.5

LXT 970-75 LXT 971-75

LXT 970-175 LXT 971-175

LXT 970-250 LXT 971-250

LXT 970-500 LXT 971-500

3.0 TYPICAL SENSOR OUTPUT

Max Rated Torque

[Nm (ft-lb)]

bidirectional (+/-)

2.5 (1.8)

5.0 (3.7)

7.5 (5.5)

17.5 (12.9)
75 (55.3)

175 (129)

250 (184.3)

500 (368.6)

Max Overload

[Nm (ft-lb)]

Ft-Lbs
5 (3.6) 5000 / 1000

10 (7.4) 5000 / 1000

15 (11) 5000 / 1000

35 (25.8) 5000 / 1000

150 (110.6) 5000 / 1000

350 (258) 5000 / 1000

350 (258) 5000 / 1000

750 (552.9) 5000 / 1000

Max Rotational

[rpm]

Round / Square

CF 59 1 V-11/18/02

V

out(max)

between 0.5V and 4.5V; the actual signal output range depends on the calibraton value and the torque range.

and V

out(min)

are defined by the slope of each sensor. This means, the output is capable to be

LXT 971

(Round Shaft with
Keyway)

LXT 970

(Square Drive)

sFt

(1) Do not loosen or tighten the mounting screws.
(2) See 8.4 – Offset adjustment

Dimensions Nominal Torque Capacity

LXT 970
¼ inch

3/8 inch
½ inch 175-250 123.5 70 18.5 - 50 35 8 5 24 - 43.9 18 47 1.5

¾ inch 500 146 87 29.6 - 60 29.6 10.5 2 33.5 - 61.4 19 57 1.5
LXT 971
Ø 9 mm

Ø 14 mm 75 139 70 34.5 14 50 - 8 5 - 30 43.9 18 47 1.5
Ø 19 mm 175-250 179 70 54.5 19 50 - 8 5 - 50 43.9 18 47 1.5

[Nm]

2.5 - 5.0 - 7.5 - 17.5 95.5 70 9.5 - 40 16
75

2.5 - 5.0 - 7.5 - 17.5

A B C D E F G H K L M N P S

8 5 12 - 43.9 15 37 1.5

107 70 13 - 50 24 8 5 18 - 43.9 18 47 1.5

125 70 27.5 9 40 - 8 5 - 23 43.9 15 37 1.5

4.0 KEYWAY DIMENSIONS (ROUND SHAFT
SENSORS ONLY)

Dimensions Keyway [mm] Keystones

Shaft

Diameter

Width Depth Length Height Length

Ø 9 mm 3 1.8 18.5 3
Ø 14 mm 5 3 25.5 5
Ø 19 mm 6 3.5 45.5 6

18
25
45

CF 59 2 V-11/18/02