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 (258kb)
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=0.81''
ID=0.10''
D3=0.08''
D4=0.08''
TF=M3x0.5, 0.7''2
CL1=2.4''
DCW500 to DCW8000
D1=0.81''
ID=0.268''
D3=0.187''
D4=0.235''
TF=M5x0.8, 0.6''
CL1=2.4''
Type Range Linearity error (% F.S.) L X Total weight Armature weight Over-Travel
Inward over-travel
DCW100 ±2.5mm (±0.1'') <±0.5/±0.25 2.7'' 1.28'' 4oz 0.05oz 0.4''
DCW200 ±5mm (±0.2'') <±0.5/±0.25 2.7'' 1.28'' 4oz 0.06oz 0.3''
DCW300 ±7.5mm (±0.3'') <±0.5/±0.25 2.7'' 1.28'' 4oz 0.06oz 0.2''
DCW400 ±10mm (±0.4'') <±0.5/±0.25 2.7'' 1.28'' 4oz 0.07oz 0.1''
DCW500 ±12.5mm (±0.5'') <±0.5/±0.25/±0.1 8.0'' 1.5'' 9oz 0.7oz 0.4''
DCW1000 ±25mm (±1'') <±0.5/±0.25/±0.1 9.1'' 2.5'' 11oz 0.9oz 0.9''
DCW2000 ±50mm (±2'') <±0.5/±0.25/±0.1 13.9'' 3.0'' 14oz 1.4oz 0.4''
DCW3000 ±75mm (±3'') <±0.5/±0.25/±0.1 18.5'' 4.5'' 1.2lb 2.0oz 0.9''
DCW4000 ±100mm (±4'') <±0.5/±0.25/±0.1 19.8'' 5.0'' 1.4lb 2.5oz 0.4''
DCW6000 ±150mm (±6'') <±0.5/±0.25 27.8'' 7.0'' 1.9lb 3.7oz 0.4''
DCW8000 ±200mm (±8'') <±0.5/±0.25 35.8'' 10.0'' 2.8lb 5.0oz 1.4''

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 = 0.81''
D3 = 0.19''
CL1 = 2.4''
TF = M5x0.8, 0.6''
Type Range Linearity error (% F.S.) L X Total weight Over-Travel
Inward over-travel Outward over-travel
DCW500B ±12.5mm (±0.5'') <±0.5/±0.25/±0.1 8.0'' 1.5'' 13oz 0.4'' 1.1''
DCW1000B ±25mm (±1'') <±0.5/±0.25/±0.1 9.1'' 2.5'' 15oz 0.7'' 1.0''
DCW2000B ±50mm (±2'') <±0.5/±0.25/±0.1 13.9'' 3.0'' 1.2lb 0.4'' 1.1''
DCW3000B ±75mm (±3'') <±0.5/±0.25/±0.1 18.5'' 4.5'' 1.4lb 0.9'' 1.1''
DCW4000B ±100mm (±4'') <±0.5/±0.25/±0.1 19.8'' 5.0'' 1.8lb 0.4'' 1.1''
DCW6000B ±150mm (±6'') <±0.5/±0.25 27.8'' 7.0'' 2.3lb 0.4'' 1.4''
DCW8000B ±200mm (±8'') <±0.5/±0.25 35.8'' 10.0'' 3.3lb 1.4'' 1.6''
DCW10000B ±250mm (±10'') <±0.5/±0.25 43.1'' 12.0'' 3.8lb 1.4'' 1.9''
DCW15000B ±375mm (±15'') <±0.5 58.8'' 16.0'' 5.0lb 0.4'' 1.1''
DCW18500B ±470mm (±18.5'') <±0.5 69.5'' 20'' 5.8lb 0.9'' 1.4''

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 = 0.81''
D2 = 0.31''
D3 = 0.16''
L2 = 1.4''
CL1 = 2.4''

Shown with standard cable assembly, see below for options
DCW500A to DCW3000A
D1 = 0.81''
D3 = 0.19''
CL1 = 2.4''

Shown with standard cable assembly, see below for options
Type Range Linearity error (% F.S.) L X Total weight Spring force (nom) Over-Travel
Spring force at X Spring rate Inward over-travel Outward over-travel
DCW100A ±2.5mm (±0.1'') <±0.5/±0.25 2.7'' 0.5'' 5oz 3oz 8.5oz/inch 0.09'' 0.06''
DCW200A ±5mm (±0.2'') <±0.5/±0.25 2.7'' 0.5'' 5oz 3oz 7.1oz/inch 0.01'' 0.06''
DCW300A ±7.5mm (±0.3'') <±0.5/±0.25 2.7'' 0.7'' 5oz 5oz 5.8oz/inch 0.1'' 0.06''
DCW400A ±10mm (±0.4'') <±0.5/±0.25 2.7'' 0.9'' 5oz 6oz 7.2oz/inch 0.06'' 0.06''
DCW500A ±12.5mm (±0.5'') <±0.5/±0.25/±0.1 8.0'' 1.5'' 9oz 4.4oz 2.0oz/inch 0.2'' 1.1''
DCW1000A ±25mm (±1'') <±0.5/±0.25/±0.1 9.1'' 2.5'' 11oz 7.0oz 2.3oz/inch 0.2'' 1.0''
DCW2000A ±50mm (±2'') <±0.5/±0.25/±0.1 13.9'' 3.0'' 15oz 15oz 3.6oz/inch 0.2'' 1.1''
DCW3000A ±75mm (±3'') <±0.5/±0.25/±0.1 18.5'' 4.5'' 1.2lb 1lbs 3.2oz/inch 1.1'' 1.1''

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 >=±12.5mm (±0.5'') 4mA 12mA 20mA
TM0321B >=±12.5mm (±0.5'') 20mA 12mA 4mA

Specification
V output Supply voltage (dual) ±12V to 40V 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 -58°F to 176°F*
4-20mA output (>=±12.5mm (±0.5'')) 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 14°F to 158°F*
Both outputs Temperature coefficient (zero) ±0.006% F.S. /°F (typical)
Temperature coefficient (span) ±0.017% F.S. /°F (typical)
Maximum static pressure 3000psi *

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 = 2.4''
Cable length = 16ft
Operating temperature range* = -13°F to 194°F
Maximum static pressure* = 145psi
Connection details Standard TM0085 TM0321
Option code 1 - End exit solder pins for customer to fit their own cable
CL1 = 0.8''
CL2 = 0.25''
CD1 = 0.5''
Operating temperature range* = -40°F to 257°F
Option code 2 - End exit fully sleeved integral cable
CL1 = 1.0''
CL2 = 2.0''
CD1 = 1.0''
CBD (Cable bend datum) = 7.3''
Cable length = 23.6'' to 23ft
Operating temperature range* = -40°F to 212°F
Maximum static pressure* = 500psi
Connection details Standard TM0085 TM0321
Option code 3 - End exit part-sleeved integral cable
CL1 = 1.0''
CL2 = 2.0''
CD1 = 1''
CBD (Cable bend datum) = 3''
CSL = 24''
Cable length = 39.4'' to 328ft
Operating temperature range* = -40°F to 194°F
Maximum static pressure* = 250psi
Connection details Standard TM0085 TM0321
Option code 5 - End exit integral MI (mineral insulated) stainless steel cable
CL1 = 0.2''
CD1 = 0.1''
Cable length = 3.9'' to 230ft
Operating temperature range* = -40°F to 392°F
Maximum static pressure* = 3000psi
D5 = 0.5''
Connection details Standard TM0085 TM0321
Option code 6 - End exit connector with customer defined cable length fitted
CL1 = 2.5''
Cable length = 0'' to 3281ft
Operating temperature range* = -13°F to 257°F
Maximum static pressure* = 116psi
Connection details Standard TM0085 TM0321
Standard cable 7 - Side exit connector with cable fitted
CBX = 1.0''
TR = M5x0.8, 0.43''
CL1 = 2.5''
Cable length = 16ft
Operating temperature range* = -13°F to 194°F
Maximum static pressure* = 145psi
Connection details Standard TM0085 TM0321
Standard cable 8 - Side exit fully sleeved integral cable~
CBX = 1.0''
TR = M5x0.8, 0.43''
CL1 = 1.2''
CL2 = 2''
CD1 = 1''
CBD (Cable bend datum) = 7''
Cable length = 23.6'' to 23ft
Operating temperature range* = -40°F to 212°F
Maximum static pressure* = 500psi
Connection details Standard TM0085 TM0321
Standard cable 9 - Side exit connector with customer defined cable length fitted
CBX = 1.0''
TR = M5x0.8, 0.43''
CL1 = 2.8''
Cable length = 0'' to 3281ft
Operating temperature range* = -13°F to 257°F
Maximum static pressure* = 116psi
Connection details Standard TM0085 TM0321
Standard cable 10 - Side exit part-sleeved integral cable
CBX = 1.0''
TR = M5x0.8, 0.43''
CL1 = 1.2''
CL2 = 2.2''
CD1 = 1''
CBD (Cable bend datum) = 7''
CSL = 6''
Cable length = 23.6'' to 3281ft
Operating temperature range* = -40°F to 194°F
Maximum static pressure* = 250psi
Connection details TM0321
Standard cable 11 - Side exit part-sleeved integral cable and conduit fitting
CBX = 1.0''
TR = M5x0.8, 0.43''
CL1 = 1.0''
CL2 = 2.0''
TC = 1/2''-14 NPT, 0.8''
CBD (Cable bend datum) = 7.3''
CSL = 6''
Cable length = 39.4'' to 3281ft
Operating temperature range* = -40°F to 194°F
Maximum static pressure* = 247psi
Connection details TM0321

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/us/dcw.htm 20080110
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.
 

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
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