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SSD Seawater Submersible LVDT Displacement Transducer

High cycle life
Seawater submersible
Stainless steel
High resolution
Voltage / 4-20mA output
image of SSD Seawater Submersible 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.
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.
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 2.3km.
Unguided version.
On our SSD 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 SSD unguided position measurement transducers are appropriate where external guidance is available and give truly non-contact operation
Side (radial) exit cable.
dimensional drawing of  SSA Seawater Submersible LVDT Displacement Transducer
27mm (Optimum sensor mounting zone)
TF=M10x1.5, 30mm
X=Centre of range
Type Range Linearity error (% F.S.) L X (nom) LA Total weight Armature weight
SSD500 ±12.5mm ±0.5 224mm 53mm 145mm 1.2kg 90g
SSD1000 ±25mm ±1 251mm 66mm 170mm 1.3kg 100g
SSD2000 ±50mm ±0.5 346mm 91mm 265mm 1.8kg 160g
SSD3000 ±75mm ±0.5 435mm 117mm 349mm 2.0kg 210g
SSD4000 ±100mm ±0.5 536mm 142mm 440mm 2.2kg 260g

Specification Voltage Output (Standard)
Supply voltage (dual) ±12V to ±20V, 30mA
Supply voltage (single, must be floating) 12V to 36V
Change in output for change in supply 5mV/V (typical)
Output ±5V (standard), 0 to 10V (optional)
Output ripple 30mV peak-to-peak (typical)
Analogue output bandwidth 200Hz

Specification 4-20mA Output (Optional)
Supply voltage (Vs) 12V to 36V, 30mA
Max loop resistance (Supply voltage-11) x 50Ω
Output ripple 50uA (peak-to-peak)
Analogue output bandwidth 250Hz

Specification Both Outputs
Temperature coefficient (span) ±0.03% F.S. /℃ (typical)
Operating temperature range -10℃ to 60℃
Electrical termination 2m (integral cable)
Maximum static pressure 23MPa

Connection details