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SSA Seawater Submersible LVDT Displacement Transducer

　
High cycle life
Seawater submersible
Stainless steel
Infinite resolution


RDP LVDT How it Works

   Data sheet (186kb)
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 2.3km.

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 = 38.1mm
D3 = 10mm
ID = 13mm
CL1 = 92mm
CD1 = 35mm
MZ = 27mm (Optimum sensor mounting zone)
A = 48mm
TF = M10x1.5, 30mm
Type Range Linearity error (% F.S.) L X LA Total weight Armature weight Sensitivity (nom)
SSA500 ?2.5mm <?.5 224mm 53mm 145mm 1.1kg 90g 0.3V/V
SSA1000 ?5mm <? 251mm 66mm 170mm 1.2kg 100g 0.4V/V
SSA2000 ?0mm <?.5 346mm 91mm 265mm 1.7kg 160g 0.3V/V
SSA3000 ?5mm <?.5 435mm 117mm 349mm 1.9kg 210g 0.5V/V
SSA4000 ?00mm <?.5 536mm 142mm 440mm 2.1kg 260g 0.7V/V

　

Specification
Excitation/supply (acceptable) 1V to 7V rms, 1kHz to 5kHz (sinusoidal) Operating temperature range -40癈 to 60癈
Excitation/supply (calibrated) 5V rms, 5kHz (sinusoidal) Electrical termination 2m (integral cable)
Temperature coefficient (zero) ?.01% F.S. /癈 (typical) Maximum static pressure 23MPa
Temperature coefficient (span) ?.01% F.S. /癈 (typical) 　 　

　

　
Connection details
SSA

　

　

Options and accessories
Electronics
SSD Seawater Submersible LVDT Displacement Transducer

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


How it Works - Dc LVDT
How it Works - 4 to 20mA LVDT

   Data sheet (201kb)
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 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.
A = 48mm
CD1 = 35mm
CL1 = 92mm
D1 = 38.1mm
D3 = 10mm
ID = 13mm
MZ = 27mm (Optimum sensor mounting zone)
TF = M10x1.5, 30mm
Type Range Linearity error (% F.S.) L X LA Total weight Armature weight
SSD500 ?2.5mm <?.5 224mm 53mm 145mm 1.2kg 90g
SSD1000 ?5mm <? 251mm 66mm 170mm 1.3kg 100g
SSD2000 ?0mm <?.5 346mm 91mm 265mm 1.8kg 160g
SSD3000 ?5mm <?.5 435mm 117mm 349mm 2.0kg 210g
SSD4000 ?00mm <?.5 536mm 142mm 440mm 2.2kg 260g

　
Output details
Option code Note - position 0 +position
Standard Connection details 　 -5V (+0% - 5%) 0V 5V (+0% - 5%)
TM0627 　 5V (+0% - 5%) 0V -5V (+0% - 5%)
TM0085A Connection details 　 0V 5V 10V (+0% - 5%)
TM0085B Connection details 　 10V (+0% - 5%) 5V 0V
TM0321A Connection details >=?2.5mm 4mA 12mA 20mA
TM0321B Connection details >=?2.5mm 20mA 12mA 4mA

　
Specification
V output Supply voltage (dual) ?2V to ?0V dc, 30mA
Supply voltage (single, must be floating) 24V to 40V dc, 30mA
Change in output for change in supply 5mV/V (typical)
Output load 10kOhms
Output ripple 30mV peak-to-peak (typical)
Electrical output bandwidth 200Hz
Output impedance 2 Ohms
Operating temperature range -40癈 to 60癈
4-20mA output Supply voltage 12V to 36V dc
Max loop resistance (Supply voltage-11) x 50 Ohms
Output ripple 50uA (peak-to-peak)
Electrical output bandwidth 200Hz
Operating temperature range -10癈 to 60癈
Both outputs Temperature coefficient (zero) ?.01% F.S. /癈 (typical)
Temperature coefficient (span) ?.03% F.S. /癈 (typical)
Electrical termination 2m (integral cable)
Maximum static pressure 23MPa
RDP Logo

SSD Series Submersible Displacement Transducers

SSD Submersible Displacement Transducers come in one armature configuration:-

Unguided Armature Image

Unguided Armature transducers have an armature which is a separate component from the body of the transducer. This provides the possibility of friction free and non-contact movement and is appropriate for applications with a very high number of cycles.


Due to the RDP Electronics policy of on-going development, specifications may change without notice.
Any modification may affect the specification of our equipment.