 | Order Code: | RDP AC LVDT Summary of models |
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Print this page | | | | | Packaging: | 1 | | Min. Order: | 0 | | Supplier: | RDP Electronics Ltd |  |
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RDP D5 and D6 Series AC 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. These LVDTs are available as either unguided or spring return versions. |
| Model D5 & D6 variants | Range |
|---|
| Unguided core, axial cable exit | ±2.5mm to ±75mm | | Unguided core, radial cable exit | ±2.5mm to ±75mm | | Spring return core, axial cable exit | ±0.25mm to ±75mm | | Spring return core, radial cable exit | ±0.25mm to ±75mm |
| D5 and D6 Basic Specification | Values |
|---|
| Excitation/supply (acceptable) | 0.5V to 7V rms, 2kHz to 10kHz (sinusoidal) | | Excitation/supply (calibrated) | 5V rms, 5kHz (sinusoidal) | | Output load | 100kΩ | | Linearity error (Standard) | ±0.5% F.S. | | Linearity error (Optional on some models) | ±0.25% F.S. | | Linearity error (Optional on some models) | ±0.1% F.S. | | Temperature coefficient (span) | ±0.01% F.S. (typical) | | Operating temperature range | -20°C to 125°C | | Electrical termination | 2m (integral cable) Longer available to order. |
RDP GT Series Precision Gauging AC LVDT
 | | 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. The GT series gauging transducer employs precision linear bearings to optimise the LVDTs measurement precision and repeatability. |
| Model GT variants | Range |
|---|
| Spring return core, axial cable exit | ±0.5mm to ±5mm | | Spring return core, radial cable exit | ±0.5mm to ±5mm | | Air push core, axial cable exit | ±1mm to ±5mm |
| GT Basic Specification | Values |
|---|
| Excitation/supply (acceptable) | 0.5V to 7V rms, 2kHz to 10kHz (sinusoidal) | | Excitation/supply (calibrated) | 5V rms, 5kHz (sinusoidal) | | Output load | 100kΩ | | Linearity error (Standard) | ±0.25% F.S. | | Linearity error (Optional on some models) | ±0.1% F.S. | | Repeatability | 0.00015mm | | Temperature coefficient (span) | ±0.01% F.S. (typical) | | Operating temperature range | -40°C to 100°C | | Electrical termination | 2m (integral cable) Longer available to order. |
RDP ACT series general purpose LVDT
 | 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. This popular series of displacement transducer is available as either an unguided, captive or spring return version.
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| Model ACT variants | Range |
|---|
| Unguided core, radial cable exit | ±12.5mm to ±200mm | | Captive guided core, radial cable exit | ±12.5mm to ±470mm | | Spring return core, radial cable exit | ±12.5mm to ±75mm |
| ACT Basic Specification | Values |
|---|
| Excitation/supply (acceptable) | 0.5V to 7V rms, 2kHz to 10kHz (sinusoidal) | | Excitation/supply (calibrated) | 5V rms, 5kHz (sinusoidal) | | Output load | 100kΩ | | Linearity error (Standard) | ±0.5% F.S. | | Linearity error (Optional on some models) | ±0.25% F.S. | | Linearity error (optional on some models) | ±0.1 F.S. | | Temperature coefficient (span) | ±0.01% F.S. (typical) | | Operating temperature range | -50°C to 125°C | | Electrical termination | 2m (integral cable) Longer available to order. |
RDP D5W series submersible LVDT
 | 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 LVDTs are available as either unguided or spring return versions.
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| Model D5W variants | Range |
|---|
| Unguided core, axial cable exit | ±1.0mm to ±12.5mm | | Unguided core, radial cable exit | ±1.0mm to ±12.5mm | | Spring return core, radial cable exit | ±1.0mm to ±12.5mm |
| D5W Basic Specification | Values |
|---|
| Excitation/supply (acceptable) | 0.5V to 7V rms, 2kHz to 10kHz (sinusoidal) | | Excitation/supply (calibrated) | 5V rms, 5kHz (sinusoidal) | | Output load | 100kΩ | | Linearity error (Standard) | ±0.5% F.S. | | Linearity error (Optional on some models) | ±0.25% F.S. | | Linearity error (optional on some models) | ±0.1 F.S. | | Temperature coefficient (span) | ±0.01% F.S. /°C(typical) | | Operating temperature range | -20°C to 125°C | | Mounting thread | M3x0.5 | | Electrical termination | 2m (integral cable) Longer available to order. | | Maximum static pressure | 3.4MPa |
RDP ACW series submersible LVDT
 | | 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. This series of displacement transducer is available as either an unguided, captive or spring return version. |
| Model ACW variants | Range |
|---|
| Unguided core, axial connector | ±12.5mm to ±200mm | | Unguided core, axial connector | ±12.5mm to ±470mm | | Spring return core, axial connector | ±12.5mm to ±75mm |
| ACW Basic Specification | Values |
|---|
| Excitation/supply (acceptable) | 0.5V to 7V rms, 2kHz to 10kHz (sinusoidal) | | Excitation/supply (calibrated) | 5V rms, 5kHz (sinusoidal) | | Output load | 100kΩ | | Linearity error (Standard) | ±0.5% F.S. | | Linearity error (Optional on some models) | ±0.25% F.S. | | Linearity error (optional on some models) | ±0.1 F.S. | | Temperature coefficient (span) | ±0.01% F.S. /°C(typical) | | Operating temperature range | -40°C to 125°C | | Maximum static pressure | 21MPa |
RDP SSA series seawater submersible
 | 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.
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| Model SSA variants | Range |
|---|
| Unguided core, radial cable exit | ±12.5mm to ±100mm |
| SSA Basic Specification | Values |
|---|
| Excitation/supply (acceptable) | 1V to 7V rms, 1kHz to 5kHz (sinusoidal) | | Excitation/supply (calibrated) | 5V rms, 5kHz (sinusoidal) | | Temperature coefficient (span) | ±0.01% F.S. /°C(typical) | | Operating temperature range | -40°C to 60°C | | Mounting thread | M10x1.5 | | Electrical Termination | 2m (integral cable) | | Maximum static pressure | 23MPa |
The unique features of the LVDT. The commendable features of the LVDT arise from the electrically isolated transformer coupled with the non-contacting core. The non-contacting core provides a frictionless measurement. Any measurement that can tolerate a low mass core becomes the ideal target system for LVDT's. When used for displacement or vibration measurement the absence of friction essentially means there is nothing to wear, leading to a potentially infinite life expectancy. It is also practical to provide models suitable to pressurized measurements including water, corrosive or caustic fluids. Such applications can include flowmeters, densitometers and level detection, including position of flow valves and actuators. A frictionless measurement also provides the realisation of infinite resolution, solely limited by the readability of the external electronics, a situation that continues to improve as the years pass and component quality improves. The inherent symmetry of the LVDT construction provides for excellent null repeatability. The null position is extremely stable and repeatable which provides the ideal solution for high gain closed loop control systems. Again, as the years pass, improved winding techniques have provided consistent symmetrical coils and more perfect null points. The DC LVDT The miniaturisation of electronics led to the provision of DC LVDT's. Manufactures were able to optimise the windings and electronics to provide the market - With a lower cost LVDT system.
- With optimise designs offering good sensitivity and linearity.
- With ease of use and installation.
The AC LVDT While the overall cost of an AC LVDT plus power supply and control circuit is greater than a DC LVDT there remains reasons to employ AC LVDT's. - Standard AC LVDT excitation / amplifier modules offer a range of excitation frequencies which in turn alter the sensitivity and output of the LVDT. This easy customisation of the response curve may be useful in the lab and may also improve the control in a field installation.
- Although LVDT cases are designed to provide a high level of magnetic shielding experience has shown that when several LVDT are used in close promximity the primary excitiation signal may interact either via the wiring or LVDT body. RDP produce AC LVDT power packs with a Master / Slave link pin which synchronises phase and frequency of excitiation signals and thereby avoids this form of cross talk.
- In installations where unavoidable damage to the LVDT may occur the replacement of only the LVDT costs less.
- The addition of safety features and alarm monitoring in some excitation / amplifier modules.
Unguided, guided and captive cores. The choice is probably obvious to the user. One important point is that an unguided core must be used with the LVDT and calibration chart provided and must be inserted the with the correct end to the top. While a replacement core can be purchased the user should recalibrate the new combination. The manufacture and annealing of a core are time and energy consuming processes and replacements are surprisingly expensive.
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