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DCW Submersible DC to DC LVDT Displacement Transducer


High accuracy
High cycle life
Submersible
Stainless steel
High resolution
Voltage / 4-20mA output
image of DCW Submersible DC to DC LVDT Displacement Transducer
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.
Electrical supply options
DCWH Supply ±15V, Output ±5v
DCWV Supply 24V, Output 0-10V isolated
DCWL Supply 6-18Vdc, Output ±2.2V isolated
DCWC Supply 24V, 4-20mA 2 wire
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
DCWH100 to DCWH400
dimensional drawing of LVDT unguided
CL1=62mm
D1=20.6mm
D3=2.0mm
D4=2.0mm
ID=2.50mm
TF=M3x0.5, 18mm
DCWH500 to DCWH8000
dimensional drawing of LVDT unguided
CL1=62mm
D1=20.6mm
D3=4.75mm
D4=5.97mm
ID=6.80mm
TF=M5x0.8, 15mm
Type Range Linearity error (% F.S.) L X (nom) Total weight Armature weight Inward over-travel
DCWH100 ±2.5mm ±0.5/±0.25 68mm 33mm 125g 1.4g 9.6mm
DCWH200 ±5mm ±0.5/±0.25 68mm 33mm 125g 1.8g 7.1mm
DCWH300 ±7.5mm ±0.5/±0.25 68mm 33mm 125g 1.8g 4.6mm
DCWH400 ±10mm ±0.5/±0.25 68mm 33mm 125g 1.9g 2.1mm
DCWH500 ±12.5mm ±0.5/±0.25/±0.1 203mm 38mm 243g 19g 10mm
DCWH1000 ±25mm ±0.5/±0.25/±0.1 231mm 63mm 300g 26g 23mm
DCWH2000 ±50mm ±0.5/±0.25/±0.1 354mm 76mm 399g 40g 10mm
DCWH3000 ±75mm ±0.5/±0.25/±0.1 470mm 114mm 527g 57g 23mm
DCWH4000 ±100mm ±0.5/±0.25/±0.1 503mm 127mm 655g 71g 10mm
DCWH6000 ±150mm ±0.5/±0.25 707mm 178mm 882g 104g 10mm
DCWH8000 ±200mm ±0.5/±0.25 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.
DCWH500B to DCWH18500B
dimensional drawing of LVDT captive guided
CL1=62mm
D1=20.6mm
D3=4.75mm
TF=M5x0.8, 15mm
Type Range Linearity error (% F.S.) L X (nom) Total weight Inward over-travel Outward over-travel
DCWH500B ±12.5mm ±0.5/±0.25/±0.1 203mm 38mm 370g 10mm 28mm
DCWH1000B ±25mm ±0.5/±0.25/±0.1 231mm 63mm 428g 17mm 25mm
DCWH2000B ±50mm ±0.5/±0.25/±0.1 354mm 76mm 541g 10mm 28mm
DCWH3000B ±75mm ±0.5/±0.25/±0.1 470mm 114mm 655g 23mm 28mm
DCWH4000B ±100mm ±0.5/±0.25/±0.1 503mm 127mm 797g 10mm 28mm
DCWH6000B ±150mm ±0.5/±0.25 707mm 178mm 1.1kg 10mm 35mm
DCWH8000B ±200mm ±0.5/±0.25 909mm 254mm 1.5kg 36mm 41mm
DCWH10000B ±250mm ±0.5/±0.25 1094mm 305mm 1.7kg 36mm 47mm
DCWH15000B ±380mm ±0.5 1493mm 406mm 2.2kg 10mm 28mm
DCWH18500B ±470mm ±0.5 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.
DCWH100A to DCWH400A
dimensional drawing of LVDT spring return
CL1=62mm
D1=20.6mm
D2=8.0mm
D3=4mm
L2=36mm
DCWH500A to DCWH3000A
dimensional drawing of LVDT spring return
CL1=62mm
D1=20.6mm
D3=4.75mm
Type Range Linearity error (% F.S.) L X (nom) Total weight Spring force at X Spring rate Inward over-travel Outward over-travel
DCWH100A ±2.5mm ±0.5/±0.25 68mm 11mm 135g 0.9N 0.9N/cm 2.3mm 1.4mm
DCWH200A ±5mm ±0.5/±0.25 68mm 13mm 136g 0.9N 0.8N/cm 0.3mm 1.4mm
DCWH300A ±7.5mm ±0.5/±0.25 68mm 18mm 137g 1.3N 0.6N/cm 1.5mm 1.4mm
DCWH400A ±10mm ±0.5/±0.25 68mm 22mm 138g 1.7N 0.8N/cm 1.5mm 1.4mm
DCWH500A ±12.5mm ±0.5/±0.25/±0.1 203mm 38mm 257g 1.2N 0.2N/cm 6mm 28mm
DCWH1000A ±25mm ±0.5/±0.25/±0.1 231mm 63mm 314g 1.9N 0.3N/cm 4mm 25mm
DCWH2000A ±50mm ±0.5/±0.25/±0.1 354mm 76mm 428g 4.1N 0.4N/cm 6mm 28mm
DCWH3000A ±75mm ±0.5/±0.25/±0.1 470mm 114mm 541g 5.4N 0.4N/cm 15mm 28mm

Electrical termination options
Standard cable - End exit connector with cable fitted
image of Standard cable - End exit connector with cable fitted
dimensional drawing of Standard cable - End exit connector with cable fitted
CL1 = 62mm
Cable length = 5m
Operating temperature range* = -25℃ to 90℃
Maximum static pressure* = 1000kPa
Connection details
Option code 1 - End exit solder pins for customer to fit their own cable
image of Option code 1 - End exit solder pins for customer to fit their own cable
dimensional drawing of 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℃ to 125℃
Connection details
Option code 2 - End exit fully sleeved integral cable
image of Option code 2 - End exit fully sleeved integral cable
dimensional drawing of 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℃ to 100℃
Maximum static pressure* = 3MPa
Connection details
Option code 3 - End exit part-sleeved integral cable
image of Option code 2 - End exit fully sleeved integral cable
dimensional drawing of Option code 3 - End exit part-sleeved integral cable
CL1 = 25mm
CL2 = 51mm
CD1 = 25mm
CBD (Cable bend datum) = 70mm
CSL = 600mm
Cable length = 1m to 100m
Operating temperature range* = -40℃ to 90℃
Maximum static pressure* = 2MPa
Connection details
Option code 5 - End exit integral MI (mineral insulated) stainless steel cable
image of Option code 5 - End exit integral MI (mineral insulated) stainless steel cable
dimensional drawing of Option code 5 - End exit integral MI (mineral insulated) stainless steel cable
CL1 = 4mm
CD1 = 3.0mm
D5 = 11.7mm
Cable length = 100mm to 70m
Operating temperature range* = -40℃ to 200℃
Maximum static pressure* = 21MPa
Connection details
Option code 6 - End exit connector with customer defined cable length fitted
image of Option code 6 - End exit connector with customer defined cable length fitted
dimensional drawing of Option code 6 - End exit connector with customer defined cable length fitted
CL1 = 64mm
Cable length = 0mm to 1000m
Operating temperature range* = -25℃ to 125℃
Maximum static pressure* = 800kPa
Connection details
Standard cable 7 - Side exit connector with cable fitted
image of Standard cable 7 - Side exit connector with cable fitted
dimensional drawing of Standard cable 7 - Side exit connector with cable fitted
CBX = 25mm
TR = M5x0.8, 11mm
CL1 = 64mm
Cable length = 5m
Operating temperature range* = -25℃ to 90℃
Maximum static pressure* = 1000kPa
Connection details
Standard cable 8 - Side exit fully sleeved integral cable
image of Standard cable 8 - Side exit fully sleeved integral cable
dimensional drawing of Standard cable 8 - Side exit fully sleeved integral cable
CBX = 25mm
TR = M5x0.8, 11mm
CL1 = 30mm
CL2 = 55mm
CD1 = 25mm
CBD = 184mm
Cable length = 600mm to 7m
Operating temperature range* = -40℃ to 100℃
Maximum static pressure* = 3MPa
Connection details
Standard cable 9 - Side exit connector with customer defined cable length fitted
image of Standard cable 9 - Side exit connector with customer defined cable length fitted
dimensional drawing of 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℃ to 125℃
Maximum static pressure* = 800kPa
Connection details
Standard cable 10 - Side exit part-sleeved integral cable
image of Standard cable 8 - Side exit fully sleeved integral cable
dimensional drawing of Standard cable 10 - Side exit part-sleeved integral cable
CBX = 25mm
TR = M5x0.8, 11mm
CL1 = 30mm
CL2 = 55mm
CD1 = 25mm
CBD = 184mm
CSL = 150mm
Cable length = 600mm to 1000m
Operating temperature range* = -40℃ to 90℃
Maximum static pressure* = 2MPa
Connection details
Standard cable 11 - Side exit part-sleeved integral cable and conduit fitting
image of Standard cable 11 - Side exit part-sleeved integral cable and conduit fitting
dimensional drawing of 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 = 184mm
CSL = 150mm
Cable length = 1m to 1000m
Operating temperature range* = -40℃ to 90℃
Maximum static pressure* = 2MPa
Connection details
*Transducer and cable option specifications should be compared and the worst figures used

Specification DCWH
Supply voltage (dual) ±12V to ±20V
Supply voltage (single, must be floating) 24V to 40V
Change in output for change in supply 5mV/V
Output ±5V (+0% - 5%)
Output ripple 30mV (peak-to-peak typical)
Analogue output bandwidth 200Hz
Linearity error (Standard) ±0.5% F.S.
Linearity error (Optional on some models) ±0.25% F.S.
Linearity error (Optional on some models) ±0.1% F.S.
Temperature coefficient (span) ±0.03% F.S. /℃ (typical)
Operating temperature range -40℃ to 80℃*
Maximum static pressure 21MPa*

Specification DCWC
Supply voltage (Vs) 12V to 36V
Max loop resistance (Supply voltage-11) x 50Ω
Output 4-20mA (4mA = inward full scale)
Output ripple 50uA (peak-to-peak)
Analogue output bandwidth 250Hz
Linearity error (Standard) ±0.5% F.S.
Linearity error (Optional on some models) ±0.25% F.S.
Linearity error (Optional on some models) ±0.1% F.S.
Temperature coefficient (span) ±0.03% F.S. /℃ (typical)
Operating temperature range -10℃ to 70℃*
Maximum static pressure 21MPa*

Specification DCWL
Supply voltage (Vs) 5V to 18V dc, 60mA typical
Output ±2.2V
Output load 2kΩ (minimum)
Output ripple 30mV (peak-to-peak)
Analogue output bandwidth 200Hz (flat)
Output impedance 2 Ω
Linearity error (Standard) ±0.5% F.S.
Linearity error (Optional on some models) ±0.25% F.S.
Linearity error (Optional on some models) ±0.1% F.S.
Temperature coefficient (span) ±0.03% F.S. /℃ (typical)
Operating temperature range -40℃ to 70℃
Maximum static pressure 21MPa*

Specification DCWV
Supply voltage (Vs) 14V to 26V, 30mA
Output 0V to 10V (0 = inward full scale)
Output load 2k Ω
Output ripple 30mV (peak-to-peak)
Analogue output bandwidth 200Hz
Output impedance 2 Ω
Linearity error (Standard) ±0.5% F.S.
Linearity error (Optional on some models) ±0.25% F.S.
Linearity error (Optional on some models) ±0.1% F.S.
Temperature coefficient (span) ±0.03% F.S. /℃ (typical)
Operating temperature range -40℃ to 70℃
Maximum static pressure 21MPa*