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 (269kb)
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
DCTH500 to DCTH8000
TypeRangeLinearity error (% F.S.)LX (nom)Total weightArmature weightTFOver-Travel
Inward over-travel
DCTH100±2.5mm (±0.1'')<±0.5/±0.25/±0.12.52''1.3''2.6oz0.05oz0.73''0.46''
DCTH200±5mm (±0.2'')<±0.5/±0.25/±0.12.52''1.3''2.6oz0.06oz0.73''0.35''
DCTH300±7.5mm (±0.3'')<±0.5/±0.25/±0.12.52''1.3''2.6oz0.06oz0.73''0.26''
DCTH400±10mm (±0.4'')<±0.5/±0.252.52''1.3''2.6oz0.07oz0.73''0.15''
DCTH500±12.5mm (±0.5'')<±0.5/±0.25/±0.16.89''1.7''7.5oz0.60oz0.59''0.63''
DCTH1000±25mm (±1'')<±0.5/±0.25/±0.17.99''2.7''9.5oz0.81oz0.59''0.87''
DCTH2000±50mm (±2'')<±0.5/±0.25/±0.112.48''3.2''13.0oz1.31oz0.59''0.63''
DCTH3000±75mm (±3'')<±0.5/±0.25/±0.116.93''4.7''1.1lb1.94oz0.59''1.14''
DCTH4000±100mm (±4'')<±0.5/±0.25/±0.118.70''5.2''1.4lb2.50oz0.59''0.63''
DCTH6000±150mm (±6'')<±0.5/±0.2526.22''7.2''1.9lb3.53oz0.59''0.63''
DCTH8000±200mm (±8'')<±0.5/±0.2533.70''10.2''2.8lb4.94oz1.15''1.06''

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= 0.91''
D1= 0.81''
TR=M5x0.8 / 0.4''
TypeRangeLinearity error (% F.S.)LX (nom)D3Total weightTFOver-Travel
Inward over-travelOutward over-travel
DCTH500C±12.5mm (±0.5'')<±0.5/±0.25/±0.17.64''1.5''0.187''12.0oz0.59''0.39''0.47''
DCTH1000C±25mm (±1'')<±0.5/±0.25/±0.18.74''2.5''0.187''14.0oz0.59''0.51''0.39''
DCTH2000C±50mm (±2'')<±0.5/±0.25/±0.113.23''3.0''0.187''1.1lb0.59''0.39''0.55''
DCTH3000C±75mm (±3'')<±0.5/±0.25/±0.117.64''4.5''0.187''1.4lb0.59''0.94''0.6''
DCTH4000C±100mm (±4'')<±0.5/±0.25/±0.119.45''5.0''0.187''1.7lb0.59''0.31''0.6''
DCTH6000C±150mm (±6'')<±0.5/±0.2526.93''7.0''0.187''2.3lb0.59''0.47''0.67''
DCTH8000C±200mm (±8'')<±0.5/±0.2534.45''10.0''0.187''3.2lb1.25''0.87''0.98''
DCTH10000C±250mm (±10'')<±0.5/±0.2542.01''12.0''0.187''3.7lb1.05''1.34''1.38''
DCTH15000C±380mm (±15'')<±0.557.99''16.0''0.187''4.9lb0.75''0.51''0.51''
DCTH18500C±470mm (±18.5'')<±0.568.50''20.0''0.236''5.8lb1.05''0.20''1.30''

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.
DCTH500A to DCTH3000A
TypeRangeLinearity error (% F.S.)LX (nom)Total weightSpring force (nom)Over-Travel
Spring force at XSpring rateInward over-travelOutward over-travel
DCTH100AG±2.5mm (±0.1'')<±0.5/±0.25/±0.12.52''0.5''2.9oz4oz.9oz/inch0.09''0.05''
DCTH200AG±5mm (±0.2'')<±0.5/±0.25/±0.12.52''0.5''2.9oz4oz.7oz/inch0.01''0.05''
DCTH300AG±7.5mm (±0.3'')<±0.5/±0.25/±0.12.52''0.7''2.9oz5oz.6oz/inch0.06''0.05''
DCTH400AG±10mm (±0.4'')<±0.5/±0.252.52''0.9''2.9oz6oz.7oz/inch0.05''0.05''
DCTH500A±12.5mm (±0.5'')<±0.5/±0.25/±0.17.17''1.5''8.0oz5oz2oz/inch0.04''0.51''
DCTH1000A±25mm (±1'')<±0.5/±0.25/±0.18.27''2.5''10.0oz7oz3oz/inch0.12''0.39''
DCTH2000A±50mm (±2'')<±0.5/±0.25/±0.112.76''3.0''14.0oz6oz2oz/inch0.31''0.55''
DCTH3000A±75mm (±3'')<±0.5/±0.25/±0.117.17''4.5''1.1lb1lbs3oz/inch0.59''0.59''

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 >=±12.5mm (±0.5'')4mA12mA20mA
TM0321B Connection details >=±12.5mm (±0.5'')20mA12mA4mA

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-40F to 176F
4-20mA output (>=±12.5mm (±0.5''))Supply voltage12V to 36V dc
Max loop resistance(Supply voltage-11) x 50 Ohms
Output ripple50uA (peak-to-peak)
Electrical output bandwidth200Hz
Operating temperature range14F to 158F
Both outputsTemperature coefficient (span)±0.017% F.S. /F (typical)
Electrical termination6.6ft (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/us/dcth.htm 20170119
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.

RDP Electrosense
2216 Pottstown Pike
Pottstown, PA 19465
Tel: 610-469-0850
Tel: 800-334-5838
Fax: 610-469-0852
Email: info@rdpe.com