DCTH Series DC to DC LVDT Displacement Transducer

High accuracy
High resolution
Voltage / 4-20mA output
High cycle life
Stainless steel



How it Works - Dc LVDT
How it Works - 4 to 20mA LVDT
   Data sheet (253kb)
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.

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
DCTH100 to DCTH400
D1=20.6mm
ID=2.54mm
D3=2mm
D4=2.0mm
TF=M3x0.5
DCTH500 to DCTH8000
A=9mm
D1=20.6mm
ID=6.8mm
D3=4.75mm
D4=5.97mm
TF=M5x0.8
TypeRangeLinearity error (% F.S.)LXTotal weightArmature weightTFOver-Travel
Inward over-travel
DCTH1002.5mm<0.5/0.25/0.164mm33mm74g1.4g18mm11.6mm
DCTH2005mm<0.5/0.25/0.164mm33mm74g1.8g18mm9.0mm
DCTH3007.5mm<0.5/0.25/0.164mm33mm74g1.8g18mm6.5mm
DCTH40010mm<0.5/0.2564mm33mm74g1.9g18mm3.9mm
DCTH50012.5mm<0.5/0.25/0.1175mm43mm213g17g15mm16mm
DCTH100025mm<0.5/0.25/0.1203mm69mm270g23g15mm22mm
DCTH200050mm<0.5/0.25/0.1317mm81mm369g37g15mm16mm
DCTH300075mm<0.5/0.25/0.1430mm119mm497g55g15mm29mm
DCTH4000100mm<0.5/0.25/0.1475mm132mm625g71g15mm16mm
DCTH6000150mm<0.5/0.25666mm183mm852g100g15mm16mm
DCTH8000200mm<0.5/0.25856mm259mm1.3kg140g29mm27mm


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.
A= 23mm
D1= 20.6mm
TR=M5x0.8 / 11mm
TF=M5x0.8
TypeRangeLinearity error (% F.S.)LXD3Total weightTFOver-Travel
Inward over-travelOutward over-travel
DCTH500C12.5mm<0.5/0.25/0.1194mm38mm4.75mm340g15mm10mm12mm
DCTH1000C25mm<0.5/0.25/0.1222mm63mm4.75mm398g15mm13mm10mm
DCTH2000C50mm<0.5/0.25/0.1336mm76mm4.75mm511g15mm10mm14mm
DCTH3000C75mm<0.5/0.25/0.1448mm114mm4.75mm625g15mm24mm15mm
DCTH4000C100mm<0.5/0.25/0.1494mm127mm4.75mm767g15mm8mm14mm
DCTH6000C150mm<0.5/0.25684mm178mm4.75mm1.0kg15mm12mm17mm
DCTH8000C200mm<0.5/0.25875mm254mm4.75mm1.4kg32mm22mm25mm
DCTH10000C250mm<0.5/0.251067mm305mm4.75mm1.7kg27mm34mm35mm
DCTH15000C375mm<0.51473mm406mm4.75mm2.2kg19mm13mm13mm
DCTH18500C470mm<0.51740mm508mm6.00mm2.6kg27mm5mm33mm

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.
DCTH100AG to DCTH400AG
D1=20.6mm
D2=8.0mm
D3=4.0mm
L2=36mm
DCTH500A to DCTH3000A
A=9mm
D1=20.6mm
D3=4.75mm
TypeRangeLinearity error (% F.S.)LXTotal weightSpring force (nom)Over-Travel
Spring force at XSpring rateInward over-travelOutward over-travel
DCTH100AG2.5mm<0.5/0.25/0.164mm12mm83g1.0N0.9N/cm2.2mm1.3mm
DCTH200AG5mm<0.5/0.25/0.164mm13mm83g1.0N0.8N/cm0.3mm1.3mm
DCTH300AG7.5mm<0.5/0.25/0.164mm18mm83g1.5N0.6N/cm1.4mm1.3mm
DCTH400AG10mm<0.5/0.2564mm22mm83g1.8N0.8N/cm1.3mm1.3mm
DCTH500A12.5mm<0.5/0.25/0.1182mm38mm227g1.3N0.2N/cm1.0mm13mm
DCTH1000A25mm<0.5/0.25/0.1210mm63mm284g2.0N0.3N/cm3.0mm10mm
DCTH2000A50mm<0.5/0.25/0.1324mm75mm398g1.8N0.2N/cm8mm14mm
DCTH3000A75mm<0.5/0.25/0.1436mm114mm511g6.0N0.4N/cm15mm15mm

Output details (outputs 1 and 2 selected using different connections)
Option codeNote- position0+position
Standard Connection details Output 1 0V5V 10V (+0% - 5%)
Standard Connection details Output 2-5V (+0% - 5%)0V+5V (+0% - 5%)
TM0627 Connection details Output 110V (+0% - 5%)5V0V
TM0627 Connection details Output 2+5V (+0% - 5%)0V-5V (+0% - 5%)
TM0321A Connection details >=12.5mm4mA12mA20mA
TM0321B Connection details >=12.5mm20mA12mA4mA

Specification
V outputSupply voltage (dual)12V to 20V dc, 30mA
Supply voltage (single, must be floating) 24V to 40V dc, 30mA
Change in output for change in supply5mV/V
Output load10kOhms
Output ripple30mV (peak-to-peak)
Electrical output bandwidth 200Hz
Output impedance2 Ohms
Operating temperature range-40C to 80C
4-20mA output (>=12.5mm)Supply voltage12V to 36V dc
Max loop resistance(Supply voltage-11) x 50 Ohms
Output ripple50uA (peak-to-peak)
Electrical output bandwidth200Hz
Operating temperature range-10C to 70C
Both outputsTemperature coefficient (span)0.03% F.S. /C (typical)
Electrical termination2m (integral cable) Longer available to order.

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/ex/dcth.htm 20150925
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.
 
USA & Canada
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
Rest of the world
RDP Electronics Ltd
Grove Street, Heath Town
Wolverhampton, West Midlands, WV10 0PY
United Kingdom

Tel: +44 1902 457512
Fax: +44 1902 452000
Email: sales@rdpe.com
URL: www.rdpe.com

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