SSA Seawater Submersible LVDT Displacement Transducer

High cycle life
Seawater submersible
Stainless steel
Infinite resolution

RDP LVDT How it Works

   Data sheet (229kb)
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.

The SS series LVDTs are specially designed for use in sea water and heavy industrial environments with some corrosive chemicals. These LVDTs are made of welded 316 stainless steel and have a through bore plus very heavy construction. Therefore, the SS series LVDTs are capable of withstanding the most arduous industrial applications as well as 10 years seawater submersion at a depth of up to 7546ft.

LVDT transducers require external signal conditioning as detailed in the 'Electronics' section of this website.

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
D1 = 1.5''
D3 = 0.39''
ID = 0.512''
CL1 = 3.6''
CD1 = 1.38''
MZ = 1.1'' (Optimum sensor mounting zone)
A = 1.87''
TF = M10x1.5, 1.18''
Type Range Linearity error (% F.S.) L X (nom) LA Total weight Armature weight Sensitivity (nom)
SSA500 ±12.5mm (±0.5'') <±0.5 8.8'' 2.1'' 5.71'' 2.3lb 3.18oz 0.3V/V
SSA1000 ±25mm (±1'') <±1 9.9'' 2.6'' 6.69'' 2.6lb 3.53oz 0.4V/V
SSA2000 ±50mm (±2'') <±0.5 13.6'' 3.6'' 10.43'' 3.6lb 5.64oz 0.3V/V
SSA3000 ±75mm (±3'') <±0.5 17.1'' 4.6'' 13.74'' 4.1lb 7.41oz 0.5V/V
SSA4000 ±100mm (±4'') <±0.5 21.1'' 5.6'' 17.32'' 4.5lb 9.17oz 0.7V/V


Excitation/supply (acceptable)1V to 7V rms, 1kHz to 5kHz (sinusoidal) Operating temperature range -40F to 140F
Excitation/supply (calibrated)5V rms, 5kHz (sinusoidal) Electrical termination 6.6ft (integral cable)
Temperature coefficient (span)±0.006% F.S. /F (typical) Maximum static pressure 3336psi

Connection details

Options and accessories


All dimensions and specifications are nominal. 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