RDP Home Page Banner

ACT LVDT Displacement Transducer


High accuracy
High cycle life
Infinite resolution
Stainless steel
image of ACT 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.
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
Side (radial) exit cable.
dimensional drawing of LVDT unguided
A=0.35''
D1=0.81''
D3=0.187''
D4=0.235''
ID=0.268''
TGF=M5x0.8
X=Center of range
Type Range Linearity error (% F.S.) L X (nom) Total weight Armature weight TF Inward over-travel Sensitivity (nom)
ACT500 ±12.5mm (±0.5'') ±0.5/±0.25/±0.1 5.00'' 1.7'' 6.0oz 0.60oz 0.59'' 0.6'' 0.7V/V
ACT1000 ±25mm (±1'') ±0.5/±0.25/±0.1 6.10'' 2.7'' 8.0oz 0.81oz 0.59'' 0.9'' 0.9V/V
ACT2000 ±50mm (±2'') ±0.5/±0.25/±0.1 10.63'' 3.2'' 11.3oz 1.31oz 0.59'' 0.6'' 1.5V/V
ACT3000 ±75mm (±3'') ±0.5/±0.25/±0.1 14.96'' 4.7'' 1.0lb 1.94oz 0.59'' 1.1'' 1.5V/V
ACT4000 ±100mm (±4'') ±0.5/±0.25/±0.1 16.81'' 5.2'' 1.3lb 2.50oz 0.59'' 0.6'' 3.2V/V
ACT6000 ±150mm (±6'') ±0.5/±0.25 24.29'' 7.2'' 1.8lb 3.53oz 0.59'' 0.6'' 2.4V/V
ACT8000 ±200mm (±8'') ±0.5/±0.25 31.81'' 10.2'' 2.6lb 4.94oz 1.15'' 1.1'' 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.
Side (radial) exit cable.
dimensional drawing of LVDT captive guided
A=0.94''
D1=0.81''
TGF=M5x0.8
TGR=M5x0.8
TR=0.43''
X=Center of range
Type Range Linearity error (% F.S.) L X (nom) D3 Total weight TF Inward over-travel Outward over-travel Sensitivity (nom)
ACT500C ±12.5mm (±0.5'') ±0.5/±0.25/±0.1 5.98'' 1.5'' 0.187'' 10.0oz 0.59'' 0.4'' 0.47'' 0.7V/V
ACT1000C ±25mm (±1'') ±0.5/±0.25/±0.1 7.09'' 2.5'' 0.187'' 12.0oz 0.59'' 0.5'' 0.39'' 0.9V/V
ACT2000C ±50mm (±2'') ±0.5/±0.25/±0.1 11.61'' 3.0'' 0.187'' 1.1lb 0.59'' 0.4'' 0.55'' 1.5V/V
ACT3000C ±75mm (±3'') ±0.5/±0.25/±0.1 15.98'' 4.5'' 0.187'' 1.4lb 0.59'' 0.9'' 0.59'' 1.5V/V
ACT4000C ±100mm (±4'') ±0.5/±0.25/±0.1 17.80'' 5.0'' 0.187'' 1.6lb 0.59'' 0.3'' 0.55'' 3.2V/V
ACT6000C ±150mm (±6'') ±0.5/±0.25 25.31'' 7.0'' 0.187'' 2.3lb 0.59'' 0.5'' 0.67'' 2.4V/V
ACT8000C ±200mm (±8'') ±0.5/±0.25 32.80'' 10.0'' 0.187'' 3.1lb 1.25'' 0.9'' 0.98'' 1.5V/V
ACT10000C ±250mm (±10'') ±0.5/±0.25 40.55'' 12.0'' 0.187'' 3.5lb 1.05'' 1.3'' 1.38'' 2.0V/V
ACT15000C ±380mm (±15'') ±0.5 56.50'' 16.0'' 0.187'' 4.7lb 0.75'' 0.5'' 0.51'' 3.2V/V
ACT18500C ±470mm (±18.5'') ±0.5 67.01'' 20.0'' 0.236'' 5.6lb 1.05'' 0.2'' 1.30'' 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.
Side (radial) exit cable.
dimensional drawing of LVDT spring return
A=0.35''
D1=0.81''
D3=0.187''
X=Center of range
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)
ACT500A ±12.5mm (±0.5'') ±0.5/±0.25/±0.1 5.25'' 1.5'' 6.5oz 5oz 2oz/inch 0.04'' 0.51'' 0.7V/V
ACT1000A ±25mm (±1'') ±0.5/±0.25/±0.1 6.35'' 2.5'' 8.0oz 7oz 3oz/inch 0.1'' 0.39'' 0.9V/V
ACT2000A ±50mm (±2'') ±0.5/±0.25/±0.1 10.85'' 3.0'' 14.0oz 6oz 2oz/inch 0.3'' 0.55'' 1.5V/V
ACT3000A ±75mm (±3'') ±0.5/±0.25/±0.1 15.25'' 4.5'' 1.1lb 1lbs 3oz/inch 0.6'' 0.59'' 1.5V/V

Specification
Excitation/supply (acceptable) 0.5V to 7V rms, 2kHz to 10kHz (sinusoidal)
Excitation/supply (calibrated) 5V rms, 5kHz (sinusoidal)
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) ±0.006% F.S. /℉ (typical)
Operating temperature range -58℉ to 257℉
Electrical termination 6.6ft (integral cable) Longer available to order.

Connection details
ACT

Options and accessories
TM0315 Operating temperature range (maximum) = 392℉  ( ±100mm (±4'') maximum ) image of High Temperature Survival
TM0256 Increased resistance to moisture image of Resistant to Moisture
Rod-end bearings for captive-guided position transducers End bearings option thumbnail
Mounting block for RDP transducers mounting block thumbnail
E74 In-Line Signal Conditioning Amplifiers In-cable amplifer option thumbnail
Amplifiers Amplifier option thumbnail
Panel meter Panel meter option thumbnail