LVDT Signal Conditioner and Amplifier (LVDT)
- LVDT sensor excitation of 4.5 V RMS is provided
- Selectable sensitivity from 20 mV to 10 V and fine trim with potentiometer
- Analogue outputs of 4-20 mA & 0-10 V
- Selectable excitation frequency between 1 and 5 kHz
- Wide bandwidth (200 Hz) for test & measurement applications
- IP67 ABS bulkhead mountable case with cable glands
The model LVDT or RVDT signal conditioner and amplifier provides a convenient and flexible solution to the measurement of displacement or position (linear or angular) when using Linear Variable Differential Transformers or Rotary Variable Differential Transformers (LVDT's or RVDT's).
The analogue amplifier device can be powered from an AC or DC supply, and can provide the excitation needed by the attached transformer.
The excitation frequency can be selected from 5 options between 1 and 5 kHz and the conditioned signal can be output via a bipolar voltage channel or via a current loop channel, both being provided as standard.
| Parameter | ||||
|---|---|---|---|---|
| Min | Typical | Max | Units | |
| Power supply AC LVDT/A only (110/230 V AC) 50-60Hz | 99/198 | 110/230 | 126/253 | V AC |
| Power supply DC: LVD/A and /D | 18 | 24 | 28 | V DC |
| Power supply current DC: (depends on loading) | 138 | 145 | 150 | mA (200R) |
| Excitation | 4.5 | V rms | ||
| LVDT Frequency (Selected by Switch 1,2,3,4,5 kHz) | 1 | 5 | kHz ±20% | |
| LVDT Impedance | 50 | 200 | Ohms | |
| LVDT Sensitivity (switchable) | 0.02 | 10 | V | |
| Gain adjustment (Pot - fine adj) | 25 | % FR | ||
| Offset adjustment (Pot - fine adj) | 10 | % FR | ||
| Offset adjustment (Switchable - coarse adj) | 30 | % FR | ||
| Output load (voltage output) | 0 | 2 | mA | |
| Output load (current output) | 500 | Ohms | ||
| Filter cut-off (switchable ranges) | 5 | 200 | Hz | |
| Zero temperature coefficient | 2 | 4 | µV/ºC | |
| Span temperature coefficient | 0.01 | 0.015 | % FR/ ºC | |
| Linearity | 0.05 | 0.1 | % FR | |
| Gain stability- 1st 1000 hours | 0.2 | 0.4 | % FR | |
| 90 day offset stability | 6 | 10 | µV | |
| Operating temperature range | 0 | 50 | ºC | |
| Storage temperature range | -20 | 70 | ºC | |
| Humidity | 95 | % | ||
| Noise (1kHz / 20Hz filter / DC powered) | 3 | 7 | mV p-p | |
| Output Options | ±10V, ±5V, 0 - 10 V, 0 - 5V, 0 - 20mA, 4 -20mA. NB: Current output is link selectable for source or negative sink (common negative or common positive) | |||
| Connections | Field screw terminals - 2.5mm² rising clamp | |||
| Enclosure | ABS case 164 x 84 x 50 sealed to IP67 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 |
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| Environmental | ||||
| Relative Humidity | 95% maximum non condensing | |||
| CE Environmental Approvals | European EMC Directive 2004/108/EC, Low Voltage Directive 2006/95/EC | |||
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Documents
Software
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Product order options
Please read the following before selecting the options for this product:
Select the appropriate product based on your choice of power supply.
| Options | Code |
|---|---|
| Signal Conditioner & Amplifier DC Powered | LVDT/D |
| Signal Conditioner & Amplifier AC Powered | LVDT/A |
- Q: Does the SGA / LVDT lose its calibration if you switch it from 4-20 mA to 0-10 V?
A: Yes
- For more 'Frequently Asked Questions' please see our Knowledge Centre
