Vector displacement sensor VDP

Developed for replacement of widely applied differential-transformer sensors.
Can be used for measuring rotor’s axial shift, rotor’s differential expansion (axial growth), rotor deflection, case thermal expansion, valve position, servomotor stroke and other displacements.
Contactless conversion of collar linear displacement relative to the working surface of the VDP into three output electrical signals.
Produced for nominal collar thickness 8, 18, 24, 32, 140 mm.
Can be produced for any nominal collar thickness on request.
Listed in the State Register of Measurement Instruments of Ukraine as a part of meter IK-1-TK-1.
Complies with requirements of technical conditions TU U 33.2-32436145-002:2008.

Technical specifications

Measuring range L: L=1.75×D_n, mm where D_n – nominal collar thickness for sensor, mm.
When using the digital measuring device IP-1-TK it is allowed to use collars with unnominal thickness. For collars with thickness from D_n/2 to 2×D_n measuring range L: L=1.5×D_n+(D_n – D_u), mm where D_u – selected collar thickness, mm. For collars with thickness more then 2×D_n measuring range L: L=1.5×D_n, mm.
Linear displacement to electric signal conversion error, mm: ±(0.02×D_n+0,01×\|D_n – D_u\|)
Operating temperature range	-10°С..+100°С
Operating temperature range for special make	-10°С..+150°С
VDP and collar rated clearance, mm*	0.5..2.8
Current consumption, mA	400
Supply voltage	7.5VAC 50Hz
Protection type (IP code)	IP67
Size (W×D×H), mm: VDP-8-14 VDP-18-31 VDP-24-42-U VDP-24-42, VDP-32-56 VDP-160-280	42×42×85 91×59×80 142×56×103 174×56×103 640×68×125

* – depends on the VDP model and collar type

Ordering designation

Vector displacement sensor VDP–XX–YY–Z–Q:

XX – nominal collar thickness;

YY – measuring range using nominal thickness collar;

Z – VDP location relative to the turbine casing:

«P» – VDP connector is located at the top right or bottom left of the turbine casing;

«L» – VDP connector is located at the top left or bottom right of the turbine casing;

Q – VDP enclosure:

«U» – redundance enclosure;

no marking – standard enclosure.

Example . Vector displacement sensor VDP-24–42-P-U – VDP at redundance enclosure for collar with 24 mm nominal thickness, measuring range using nominal thickness collar 42 mm; acceptable collar thickness from 12 mm till 48 mm; VDP connector is located at the top right or bottom left of the turbine casing.