ACT LVDT Displacement Transducer

	High accuracy
	High cycle life
	Infinite resolution
	Stainless steel

RDP LVDT How it Works

Data sheet (316kb)

These transducers are for displacement / position measurement. They make an accurate position measurement of the movement of the armature (the sliding part) relative to the body of the displacement transducer.

This transducer uses the Linear Variable Differential Transformer (LVDT) principle which means that it is probably the most robust and reliable position sensor type available. The strength of the LVDT sensor's principle is that there is no electrical contact across the transducer position sensing element which for the user of the sensor means clean data, infinite resolution and a very long life.

This series of displacement transducer is available as either an unguided, captive or spring return version.

LVDT transducers require external signal conditioning as detailed in the 'Electronics' section of this website.

Unguided version.

On our unguided LVDTs the armature assembly is a separate component, to make a measurement the user must guide the armature inside the body without touching the sides. Unguided position measurement transducers are appropriate where external guidance is available and give truly non-contact operation

A	=	9mm
ID	=	6.8mm
D1	=	20.6mm
D3	=	4.75mm
D4	=	5.97mm
TF	=	M5x0.8

Type

Range

Linearity error (% F.S.)

X (nom)

Total weight

Armature weight

Over-Travel

Sensitivity (nom)

Inward over-travel

ACT500

±12.5mm

<±0.5/±0.25/±0.1

127mm

43mm

170g

17g

15mm

16mm

0.7V/V

ACT1000

±25mm

<±0.5/±0.25/±0.1

155mm

68mm

227g

23g

15mm

22mm

0.9V/V

ACT2000

±50mm

<±0.5/±0.25/±0.1

270mm

81mm

320g

37g

15mm

16mm

1.5V/V

ACT3000

±75mm

<±0.5/±0.25/±0.1

380mm

120mm

454g

55g

15mm

29mm

1.5V/V

ACT4000

±100mm

<±0.5/±0.25/±0.1

427mm

132mm

568g

71g

15mm

16mm

3.2V/V

ACT6000

±150mm

<±0.5/±0.25

617mm

183mm

824g

100g

15mm

16mm

2.4V/V

ACT8000

±200mm

<±0.5/±0.25

808mm

259mm

1.2kg

140g

29mm

27mm

1.5V/V

Captive guided version.

Our captive guided displacement transducer has bearings to guide the armature inside the measurement sensor. Captive LVDTs are for position measurement applications where guidance may be poor and end bearings may be required.

A	=	24mm
D1	=	20.6mm
TR	=	M5x0.8, 11mm
TF	=	M5x0.8

Type

Range

Linearity error (% F.S.)

X (nom)

Total weight

Over-Travel

Sensitivity (nom)

Inward over-travel

Outward over-travel

ACT500C

±12.5mm

<±0.5/±0.25/±0.1

152mm

38mm

4.75mm

284g

15mm

10mm

12mm

0.7V/V

ACT1000C

±25mm

<±0.5/±0.25/±0.1

180mm

63mm

4.75mm

340g

15mm

13mm

10mm

0.9V/V

ACT2000C

±50mm

<±0.5/±0.25/±0.1

295mm

76mm

4.75mm

511g

15mm

10mm

14mm

1.5V/V

ACT3000C

±75mm

<±0.5/±0.25/±0.1

406mm

114mm

4.75mm

653g

15mm

24mm

15mm

1.5V/V

ACT4000C

±100mm

<±0.5/±0.25/±0.1

452mm

127mm

4.75mm

710g

15mm

8mm

14mm

3.2V/V

ACT6000C

±150mm

<±0.5/±0.25

643mm

178mm

4.75mm

1.0kg

15mm

12mm

17mm

2.4V/V

ACT8000C

±200mm

<±0.5/±0.25

833mm

254mm

4.75mm

1.4kg

32mm

22mm

25mm

1.5V/V

ACT10000C

±250mm

<±0.5/±0.25

1030mm

305mm

4.75mm

1.6kg

27mm

34mm

35mm

2.0V/V

ACT15000C

±380mm

<±0.5

1435mm

406mm

4.75mm

2.1kg

19mm

13mm

3.2V/V

ACT18500C

±470mm

<±0.5

1702mm

508mm

6.00mm

2.5kg

27mm

5mm

33mm

3.6V/V

Spring return version.

Our spring displacement transducer has bearings to guide the armature inside the measurement sensor and a spring which pushes the armature to the fully out position. Spring return LVDTs are appropriate where it is not possible to connect the transducer armature to the moving component being measured.

A	=	9mm
D1	=	20.6mm
D3	=	4.75mm

Type

Range

Linearity error (% F.S.)

X (nom)

Total weight

Spring force (nom)

Over-Travel

Sensitivity (nom)

Spring force at X

Spring rate

Inward over-travel

Outward over-travel

ACT500A

±12.5mm

<±0.5/±0.25/±0.1

133mm

38mm

184g

1.3N

0.2N/cm

1mm

13mm

0.7V/V

ACT1000A

±25mm

<±0.5/±0.25/±0.1

161mm

63mm

227g

2.0N

0.3N/cm

3mm

10mm

0.9V/V

ACT2000A

±50mm

<±0.5/±0.25/±0.1

276mm

75mm

398g

1.8N

0.2N/cm

8mm

14mm

1.5V/V

ACT3000A

±75mm

<±0.5/±0.25/±0.1

387mm

114mm

483g

6.0N

0.4N/cm

15mm

1.5V/V

Specification
Excitation/supply (acceptable)	0.5V to 7V rms, 2kHz to 10kHz (sinusoidal)	Temperature coefficient (span)	±0.01% F.S. /�C (typical)
Excitation/supply (calibrated)	5V rms, 5kHz (sinusoidal)	Operating temperature range	-50�C to 125�C
Output load	100k Ohms	Electrical termination	2m (integral cable) Longer available to order.

Connection details

ACT

Options and accessories
TM0315 Operating temperature range (maximum) = 200�C ( ±100mm maximum )
Rod-end bearings for captive-guided position transducers
Alternative probe tips for LVDTs
Mounting block
E74 In-Line Signal Conditioning Amplifiers
Electronics

All dimensions and specifications are nominal.

www.rdpe.com/ex/act.htm

20170119

Due to our policy of on-going development, specifications may change without notice. Any modification may affect some or all of the specifications for our equipment.

USA & Canada
RDP Electrosense
2216 Pottstown Pike
Pottstown, PA 19465
USA
Tel: 610-469-0850
Tel: 800-334-5838
Fax: 610-469-0852
Email: info@rdpe.com

Rest of the world
RDP Electronics Ltd
Grove Street, Heath Town
Wolverhampton, West Midlands, WV10 0PY
United Kingdom

Tel: +44 1902 457512
Fax: +44 1902 452000
Email: sales@rdpe.com
URL: www.rdpe.com

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ACT LVDT Displacement Transducer

Specification

Options and accessories