RDP Home Page Banner
ACW Submersible LVDT Displacement Transducer

High accuracy
High cycle life
Stainless steel
Submersible
Infinite resolution
image of ACW Submersible 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 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
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 Sensitivity (nom)
ACW500 ±12.5mm ±0.5/±0.25/±0.1 153mm 38mm 200g 19g 10mm 0.7V/V
ACW1000 ±25mm ±0.5/±0.25/±0.1 181mm 63mm 257g 26g 23mm 0.9V/V
ACW2000 ±50mm ±0.5/±0.25/±0.1 304mm 76mm 350g 40g 10mm 1.5V/V
ACW3000 ±75mm ±0.5/±0.25/±0.1 420mm 114mm 484g 57g 23mm 1.5V/V
ACW4000 ±100mm ±0.5/±0.25/±0.1 453mm 127mm 598g 71g 10mm 3.2V/V
ACW6000 ±150mm ±0.5/±0.25 632mm 178mm 854g 104g 10mm 2.4V/V
ACW8000 ±200mm ±0.5/±0.25 858mm 254mm 1.2kg 142g 36mm 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.
dimensional drawing of LVDT captive guided
A=20.6mm
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 Sensitivity (nom)
ACW500B ±12.5mm ±0.5/±0.25/±0.1 153mm 38mm 314g 10mm 28mm 0.7V/V
ACW1000B ±25mm ±0.5/±0.25/±0.1 181mm 63mm 370g 17mm 25mm 0.9V/V
ACW2000B ±50mm ±0.5/±0.25/±0.1 304mm 76mm 541g 10mm 28mm 1.5V/V
ACW3000B ±75mm ±0.5/±0.25/±0.1 420mm 114mm 683g 23mm 28mm 1.5V/V
ACW4000B ±100mm ±0.5/±0.25/±0.1 453mm 127mm 740g 10mm 28mm 3.2V/V
ACW6000B ±150mm ±0.5/±0.25 632mm 178mm 1.1kg 10mm 35mm 2.4V/V
ACW8000B ±200mm ±0.5/±0.25 858mm 254mm 1.5kg 36mm 41mm 1.5V/V
ACW10000B ±250mm ±0.5/±0.25 1043mm 305mm 1.6kg 36mm 47mm 2.0V/V
ACW15000B ±380mm ±0.5 1443mm 406mm 2.2kg 10mm 28mm 3.2V/V
ACW18500B ±470mm ±0.5 1716mm 508mm 2.6kg 23mm 35mm 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.
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 Sensitivity (nom)
ACW500A ±12.5mm ±0.5/±0.25/±0.1 153mm 38mm 214g 1.2N 0.2N/cm 6mm 28mm 0.7V/V
ACW1000A ±25mm ±0.5/±0.25/±0.1 181mm 63mm 257g 1.9N 0.3N/cm 4mm 25mm 0.9V/V
ACW2000A ±50mm ±0.5/±0.25/±0.1 304mm 76mm 428g 4.1N 0.4N/cm 6mm 28mm 1.5V/V
ACW3000A ±75mm ±0.5/±0.25/±0.1 420mm 114mm 513g 5.4N 0.4N/cm 15mm 28mm 1.5V/V

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* = 10bar
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℃
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* = 34bar
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 = 1000mm to 100m
Operating temperature range* = -40℃ to 90℃
Maximum static pressure* = 17bar
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* = 207bar
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* = 8bar
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* = 10bar
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* = 34bar
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* = 8bar
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* = 17bar
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 = 1000mm to 1000m
Operating temperature range* = -40℃ to 90℃
Maximum static pressure* = 17bar
*Transducer and cable option specifications should be compared and the worst figures used
Specification
Excitation/supply (acceptable) 0.5V to 7V rms, 2kHz to 10kHz (sinusoidal)
Excitation/supply (calibrated) 5V rms, 5kHz (sinusoidal)
Output load 100k 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) ±0.01% F.S. /℃ (typical)
Operating temperature range -40℃ to 125℃*
Maximum static pressure 207bar*

Options and accessories
TM0315 Operating temperature range (maximum) = 200℃  ( ±100mm maximum )
Rod-end bearings for captive-guided position transducers End bearings option thumbnail
Mounting block mounting block thumbnail
E74 In-Line Signal Conditioning Amplifiers   ( Depending on cable type ) In-cable amplifer option thumbnail
Amplifiers Amplifier option thumbnail
Panel meter Panel meter option thumbnail

WARNING - PERSONAL INJURY
Do not use these products as safety, emergency stop or feedback devices in any application where the failure of this product could result in damage to equipment, personal injury or death.
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. All dimensions and specifications are nominal.
https://www.rdpe.com/uk/acw.htm
20190712