DCW Submersible DC to DC LVDT Displacement Transducer

DCW Submersible DC to DC LVDT Displacement Transducer

	High cycle life
	Submersible
	Stainless steel
	High accuracy
	High resolution
	Voltage / 4-20mA output

How it Works - Dc LVDT
How it Works - 4 to 20mA LVDT

Data sheet (259kb)

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.

Our DC to DC LVDT transducer has all of the benefits of the LVDT sensor principle with the added convenience of built-in LVDT electronics enabling a dc supply and dc output. As an option we can offer a 4-20mA 2 wire connection to the transducer on some models.

Our submersible displacement transducers are designed to make measurements whilst submerged in suitable liquids. Fluids which are non-magnetic can be allowed to flood the armature tube without affecting the operation of the transducer.

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

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

Shown with standard cable assembly, see below for options

DCW100 to DCW400

D1=20.6mm

ID=2.50mm

D3=2.0mm

D4=2.00mm

TF=M3x0.5, 18mm2

CL1=62mm

DCW500 to DCW8000

D1=20.6mm

ID=6.80mm

D3=4.75mm

D4=5.97mm

TF=M5x0.8, 15mm

CL1=62mm

Type

Range

Linearity error (% F.S.)

L

X

Total weight

Armature weight

Inward over-travel

DCW100

ą2.5mm

<ą0.5/ą0.25

68mm

33mm

125g

1.4g

10mm

DCW200

ą5mm

<ą0.5/ą0.25

68mm

33mm

125g

1.8g

7mm

DCW300

ą7.5mm

<ą0.5/ą0.25

68mm

33mm

125g

1.8g

5mm

DCW400

ą10mm

<ą0.5/ą0.25

68mm

33mm

125g

1.9g

2mm

DCW500

ą12.5mm

<ą0.5/ą0.25/ą0.1

203mm

38mm

243g

19g

10mm

DCW1000

ą25mm

<ą0.5/ą0.25/ą0.1

231mm

63mm

300g

26g

23mm

DCW2000

ą50mm

<ą0.5/ą0.25/ą0.1

354mm

76mm

399g

40g

10mm

DCW3000

ą75mm

<ą0.5/ą0.25/ą0.1

470mm

114mm

527g

57g

23mm

DCW4000

ą100mm

<ą0.5/ą0.25/ą0.1

503mm

127mm

655g

71g

10mm

DCW6000

ą150mm

<ą0.5/ą0.25

707mm

178mm

882g

104g

10mm

DCW8000

ą200mm

<ą0.5/ą0.25

909mm

254mm

1.3kg

142g

36mm

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.

Shown with standard cable assembly, see below for options		D1	=	20.6mm
		D3	=	4.75mm
		CL1	=	62mm
		TF	=	M5x0.8, 15mm

Type

Range

Linearity error (% F.S.)

L

X

Total weight

Inward over-travel

Outward over-travel

DCW500B

ą12.5mm

<ą0.5/ą0.25/ą0.1

203mm

38mm

370g

10mm

28mm

DCW1000B

ą25mm

<ą0.5/ą0.25/ą0.1

231mm

63mm

428g

17mm

25mm

DCW2000B

ą50mm

<ą0.5/ą0.25/ą0.1

354mm

76mm

541g

10mm

28mm

DCW3000B

ą75mm

<ą0.5/ą0.25/ą0.1

470mm

114mm

655g

23mm

28mm

DCW4000B

ą100mm

<ą0.5/ą0.25/ą0.1

503mm

127mm

797g

10mm

28mm

DCW6000B

ą150mm

<ą0.5/ą0.25

707mm

178mm

1.1kg

10mm

35mm

DCW8000B

ą200mm

<ą0.5/ą0.25

909mm

254mm

1.5kg

36mm

41mm

DCW10000B

ą250mm

<ą0.5/ą0.25

1094mm

305mm

1.7kg

36mm

47mm

DCW15000B

ą375mm

<ą0.5

1493mm

406mm

2.2kg

10mm

28mm

DCW18500B

ą470mm

<ą0.5

1766mm

508mm

2.6kg

23mm

35mm

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.

DCW100A to DCW400A
D1	=	20.6mm
D2	=	8.0mm
D3	=	4mm
L2	=	36mm
CL1	=	62mm

Shown with standard cable assembly, see below for options

DCW500A to DCW3000A
D1	=	20.6mm
D3	=	4.75mm
CL1	=	62mm

Shown with standard cable assembly, see below for options

Type

Range

Linearity error (% F.S.)

L

X

Total weight

Spring force (nom)

Spring force at X

Spring rate

Inward over-travel

Outward over-travel

DCW100A

ą2.5mm

<ą0.5/ą0.25

68mm

11mm

135g

0.9N

0.9N/cm

2mm

1mm

DCW200A

ą5mm

<ą0.5/ą0.25

68mm

13mm

136g

0.9N

0.8N/cm

0mm

1mm

DCW300A

ą7.5mm

<ą0.5/ą0.25

68mm

18mm

137g

1.3N

0.6N/cm

2mm

1mm

DCW400A

ą10mm

<ą0.5/ą0.25

68mm

22mm

138g

1.7N

0.8N/cm

2mm

1mm

DCW500A

ą12.5mm

<ą0.5/ą0.25/ą0.1

203mm

38mm

257g

1.2N

0.2N/cm

6mm

28mm

DCW1000A

ą25mm

<ą0.5/ą0.25/ą0.1

231mm

63mm

314g

1.9N

0.3N/cm

4mm

25mm

DCW2000A

ą50mm

<ą0.5/ą0.25/ą0.1

354mm

76mm

428g

4.1N

0.4N/cm

6mm

28mm

DCW3000A

ą75mm

<ą0.5/ą0.25/ą0.1

470mm

114mm

541g

5.4N

0.4N/cm

29mm

28mm

Output details
Option code	Note	- position	0	+position
Standard		-5V (+0% - 5%)	0V	5V (+0% - 5%)
TM0627		5V (+0% - 5%)	0V	-5V (+0% - 5%)
TM0085A		0V	5V	10V (+0% - 5%)
TM0085B		10V (+0% - 5%)	5V	0V
TM0321A	>=ą12.5mm	4mA	12mA	20mA
TM0321B	>=ą12.5mm	20mA	12mA	4mA

Specification
V output	Supply voltage (dual)	ą12V to ą20V dc, 30mA (typical)
	Supply voltage (single, must be floating)	24V to 40V dc, 30mA (typical)
	Change in output for change in supply	5mV/V
	Output load	10kOhms
	Output ripple	30mV (peak-to-peak typical)
	Electrical output bandwidth	200Hz
	Output impedance	2 Ohms
	Operating temperature range	-50°C to 80°C*
4-20mA output (>=ą12.5mm)	Supply voltage	12V to 36V dc
	Max loop resistance	(Supply voltage-11) x 50 Ohms
	Output ripple	50uA (peak-to-peak)
	Electrical output bandwidth	200Hz
	Operating temperature range	-10°C to 70°C*
Both outputs	Temperature coefficient (zero)	ą0.01% F.S. /°C (typical)
	Temperature coefficient (span)	ą0.03% F.S. /°C (typical)
	Maximum static pressure	207bar *

Electrical termination options * Transducer and cable option specifications should be compared and the worst figures used

Standard cable - End exit connector with cable fitted

CL1	=	62mm
Cable length	=	5m
Operating temperature range*	=	-25°C to 90°C
Maximum static pressure*	=	10bar

Connection details

Option code 1 - End exit solder pins for customer to fit their own cable

CL1	=	21mm
CL2	=	6.4mm
CD1	=	12.7mm
Operating temperature range*	=	-40°C to 125°C

Option code 2 - End exit fully sleeved integral cable

CL1	=	25mm
CL2	=	51mm
CD1	=	25mm
CBD (Cable bend datum)	=	184mm
Cable length	=	600mm to 7m
Operating temperature range*	=	-40°C to 100°C
Maximum static pressure*	=	34bar

Connection details

Option code 3 - End exit part-sleeved integral cable

CL1	=	25mm
CL2	=	51mm
CD1	=	25mm
CBD (Cable bend datum)	=	70mm
CSL	=	600mm
Cable length	=	1000mm to 100m
Operating temperature range*	=	-40°C to 90°C
Maximum static pressure*	=	17bar

Connection details

Option code 5 - End exit integral MI (mineral insulated) stainless steel cable

CL1	=	4mm
CD1	=	3.0mm
Cable length	=	100mm to 70m
Operating temperature range*	=	-40°C to 200°C
Maximum static pressure*	=	207bar
D5	=	11.7mm

Connection details

Option code 6 - End exit connector with customer defined cable length fitted

CL1	=	64mm
Cable length	=	0mm to 1000m
Operating temperature range*	=	-25°C to 125°C
Maximum static pressure*	=	8bar

Connection details

Standard cable 7 - Side exit connector with cable fitted

CBX	=	25mm
TR	=	M5x0.8, 11mm
CL1	=	64mm
Cable length	=	5m
Operating temperature range*	=	-25°C to 90°C
Maximum static pressure*	=	10bar

Connection details

Standard cable 8 - Side exit fully sleeved integral cable~

CBX	=	25mm
TR	=	M5x0.8, 11mm
CL1	=	30mm
CL2	=	55mm
CD1	=	25mm
CBD (Cable bend datum)	=	184mm
Cable length	=	600mm to 7m
Operating temperature range*	=	-40°C to 100°C
Maximum static pressure*	=	34bar

Connection details

Standard cable 9 - Side exit connector with customer defined cable length fitted

CBX	=	25mm
TR	=	M5x0.8, 11mm
CL1	=	72mm
Cable length	=	0mm to 1000m
Operating temperature range*	=	-25°C to 125°C
Maximum static pressure*	=	8bar

Connection details

Standard cable 10 - Side exit part-sleeved integral cable

CBX	=	25mm
TR	=	M5x0.8, 11mm
CL1	=	30mm
CL2	=	55mm
CD1	=	25mm
CBD (Cable bend datum)	=	184mm
CSL	=	150mm
Cable length	=	600mm to 1000m
Operating temperature range*	=	-40°C to 90°C
Maximum static pressure*	=	17bar

Connection details

Standard cable 11 - Side exit part-sleeved integral cable and conduit fitting

CBX	=	25mm
TR	=	M5x0.8, 11mm
CL1	=	25mm
CL2	=	50mm
TC	=	1/2''-14 NPT, 20mm
CBD (Cable bend datum)	=	184mm
CSL	=	150mm
Cable length	=	1000mm to 1000m
Operating temperature range*	=	-40°C to 90°C
Maximum static pressure*	=	17bar

Connection details

Options and accessories
Rod-end bearings for captive-guided position transducers
Alternative probe tips for LVDTs
Mounting block

All dimensions and specifications are nominal.

www.rdpe.com/uk/dcw.htm

20110317

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.

UK Head Office
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
Registered in England No. 1688591

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