LVDT
LVDT & RVDT Conditioning Amplifiers
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Features:
Sensor excitation of 4.5V RMS is provided
Selectable excitation frequency between 1 and 5 kHz
Selectable sensitivity from 20mV to 10V
and fine trim with potentiometer
Wide bandwidth (200 Hz) for test & measurement applications
Selectable analogue output in voltage or current loop format
including 4-20mA and 0-10VDC
IP65 / NEMA4 ABS bulkhead mountable case with cable glands
Mains version LVDT/A can also be powered from DC source
Can be used with Variable Reluctance transducers too
Introduction:
The LVDT/A & LVDT/D provide a wide range of signal conditioning for LVDT and RVDT transducers. They have also been used successfully with variable reluctance transducers such as certain differential pressure sensors. Offered in two versions, the LVDT/A for 115/230V AC or 18- 24V DC operation and the LVDT/D which is DC powered only.
Transducer sensitivities between 20mV and 10V are accommodated by a combination of DIL switch settings and a fine trim potentiometer. Similar arrangements are provided for any ‘zero’ errors in the transducers and can be used to offset the readings by up to ±35% of full scale. A wide frequency response is offered, of typically DC to 200Hz.
There is an on-board low pass filter which can be switched in to reduce high frequency fluctuations or induced electrical noise, to give stable readings under adverse conditions. A wide range of output options for current, and uni-polar or bipolar voltage can be configured by DIL switch settings.
Both the AC and DC versions are based on a common board and are mounted in a light grey ABS case sealed to IP65 standard.
Specifications:
Parameter |
Min | Typical | Max | Units |
|---|---|---|---|---|
Power supply AC LVTD/A only 50-60Hz |
99/198 |
110/230 |
126/253 |
V AC |
Power Supply DC LVDT/A & LVDT/D |
18 |
24 |
28 |
V DC |
Power supply current (depends on loading) |
138 |
145 |
150 |
mA (200R) |
Excitation |
4.5 |
V RMS | ||
LVDT Frequency (Switch selectable 1, 2, 3, 4, 5 kHz) |
1 |
- |
5 |
kHz |
LVDT Impedance |
50 |
200 |
- |
Ohms |
LVDT Sensitivity (switchable) |
0.02 |
- |
10 |
V |
Gain adjustment (pot-fine adj) |
- |
- |
25 |
% FSD |
Offset adjustment (pot - fine adj) |
- |
- |
10 |
% FSD |
Offset adjustment (switchable - coarse adj) |
- |
- |
30 |
% FSD |
Filter cut-off (switchable ranges) |
5 |
- |
200 |
Hz |
Zero temperature coefficent |
- |
2 |
4 |
µV/°C |
Span temperature coefficient |
- |
0.01 |
0.015 |
% /°C |
Linearity |
- |
0.05 |
0.1 |
% FSD |
Gain stability - 1st 1000 hours |
- |
0.2 |
0,4 |
% FSD |
90 day offset stability |
- |
6 |
10 |
µV |
Operating temperature range |
0 |
- |
50 |
°C |
Storage temperature range |
-20 |
- |
70 |
°C |
Noise (1kHz / 20Hz filter / DC powered) |
- |
3 |
7 |
mV p-p |
Output options |
±10V, ±5V, 0-10V, 0-5V, 0-20mA, 4-20mA NB: Current output is link selectable for source or negative sink (common negative or common positive) |
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Connections |
Field screw terminals - 2.5mm2 rising clamp | |||
Enclosure |
ABS case 180 x 80 x 55 vsealed to IP65 fitted with 3 off cable glands | |||
Controls |
Gain pot, Offset pot, Coarse Gain switches, Coarse Offset switches, Filter Cut-Off switches, Frequency Select switch, Output Mode switch | |||
Order Codes |
LVDT/A Analogue conditioner, AC powered LVDT/D Analogue conditioner, DC powered |
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CE & Environmental |
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Relative humidity |
95% maximum non-condensing | |||
Safety/Low Voltage Directive |
73/23/EEC amended by 93/68/EEC |
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EMC Directive |
89/336/EEC Basic Standard BS EN 61326:1998 |
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EMC Emissions |
BS EN 55011:1998 | |||
EMC Immunity |
BS EN 61000-42:1995 BS EN 61000-4-3:2002 BS EN 61000-4-4:2004 BS EN 61000-4-11:2004 |
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