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ACT LVDT Displacement Transducer


High accuracy
High cycle life
Infinite resolution
Stainless steel
image of ACT LVDT Displacement Transducer
The ACT series displacement transducers form part of our industrial series of LVDTs. Because they use the LVDT principle they have a very long life as there is no electrical contact across the sensing element which means clean, reliable data. The ACT transducer gives an output proportional to the position of the armature assembly with respect to the body of the transducer. ACT series transducers are available in three versions as detailed below.
RDP are the designers and manufactures of the ACT series and so in addition to the range of standard options (higher temperature, IP rating, radiation tolerance etc) we can offer tailor made mechanical solutions to mounting and installing the transducer.
Unguided version.
On our ACT 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. Our ACT 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=9mm
D1=20.6mm ±0.12mm
D3=4.75mm
D4=5.97mm
ID=6.8mm
TGF=M5x0.8
X=Centre 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/±0.25/±0.1 127mm 43mm 170g 17g 15mm 16mm 0.7V/V
ACT1000 ±25mm ±0.5/±0.25/±0.1 155mm 68mm 227g 23g 15mm 22mm 0.9V/V
ACT2000 ±50mm ±0.5/±0.25/±0.1 270mm 81mm 320g 37g 15mm 16mm 1.5V/V
ACT3000 ±75mm ±0.5/±0.25/±0.1 380mm 120mm 454g 55g 15mm 29mm 1.5V/V
ACT4000 ±100mm ±0.5/±0.25/±0.1 427mm 132mm 568g 71g 15mm 16mm 3.2V/V
ACT6000 ±150mm ±0.5/±0.25 617mm 183mm 824g 100g 15mm 16mm 2.4V/V
ACT8000 ±200mm ±0.5/±0.25 808mm 259mm 1.2kg 140g 29mm 27mm 1.5V/V

Captive guided version.
Our ACT captive guided displacement transducer has bearings to guide the armature inside the measurement sensor. Our ACT 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=24mm
D1=20.6mm ±0.12mm
TGF=M5x0.8
TGR=M5x0.8
TR=11mm
X=Centre 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/±0.25/±0.1 152mm 38mm 4.75mm 284g 15mm 10mm 12mm 0.7V/V
ACT1000C ±25mm ±0.5/±0.25/±0.1 180mm 63mm 4.75mm 340g 15mm 13mm 10mm 0.9V/V
ACT2000C ±50mm ±0.5/±0.25/±0.1 295mm 76mm 4.75mm 511g 15mm 10mm 14mm 1.5V/V
ACT3000C ±75mm ±0.5/±0.25/±0.1 406mm 114mm 4.75mm 653g 15mm 24mm 15mm 1.5V/V
ACT4000C ±100mm ±0.5/±0.25/±0.1 452mm 127mm 4.75mm 710g 15mm 8mm 14mm 3.2V/V
ACT6000C ±150mm ±0.5/±0.25 643mm 178mm 4.75mm 1.0kg 15mm 12mm 17mm 2.4V/V
ACT8000C ±200mm ±0.5/±0.25 833mm 254mm 4.75mm 1.4kg 32mm 22mm 25mm 1.5V/V
ACT10000C ±250mm ±0.5/±0.25 1030mm 305mm 4.75mm 1.6kg 27mm 34mm 35mm 2.0V/V
ACT15000C ±380mm ±0.5 1435mm 406mm 4.75mm 2.1kg 19mm 13mm 13mm 3.2V/V
ACT18500C ±470mm ±0.5 1702mm 508mm 6.00mm 2.5kg 27mm 5mm 33mm 3.6V/V

Spring return version.
Our ACT 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. Our ACT 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=9mm
D1=20.6mm ±0.12mm
D3=4.75mm
X=Centre 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/±0.25/±0.1 133mm 38mm 184g 1.3N 0.2N/cm 1mm 13mm 0.7V/V
ACT1000A ±25mm ±0.5/±0.25/±0.1 161mm 63mm 227g 2.0N 0.3N/cm 3mm 10mm 0.9V/V
ACT2000A ±50mm ±0.5/±0.25/±0.1 276mm 75mm 398g 1.8N 0.2N/cm 8mm 14mm 1.5V/V
ACT3000A ±75mm ±0.5/±0.25/±0.1 387mm 114mm 483g 6.0N 0.4N/cm 15mm 15mm 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) ±0.01% F.S. /℃ (typical)
Operating temperature range -50℃ to 125℃
Electrical termination 2m (integral cable) Longer available to order.

Connection details
ACT

Options and accessories
TM0315 Operating temperature range (maximum) = 200℃  ( ±100mm 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 LVDT Amplifier In-cable amplifer option thumbnail
Amplifiers Amplifier option thumbnail
Panel meter Panel meter option thumbnail