ATX-XR Series
High-Temperature & High-Radiation Hardened LVDT for Extreme Environments
Features
- Resistant to gamma and neutron radiation
- Resistant to extremely high and low temperatures
- 100% inorganic material
- Range: ±5mm to ±25mm
- Operating temperature: -200°C to +550°C
- Working pressure: 20 MPa
- Linearity: ±0.5% or ±1%
- Calibration service at specified temperatures
- Signal or dual wire options
- Threaded or flanged connections
Applications
- Deformation of components inside the reactor
- Reactor Valve Position Feedback
- Nuclear-grade flowmeter
- High-temperature and high-pressure reactor
- Engine Thrust Vectoring Feedback
- Cryogenic superconductor (physics)
- Applications in harsh environments
The core advantage of the ATX-XR series LVDT linear position sensors lies in their exceptional radiation resistance; they are specifically designed for precise displacement measurement in harsh environments such as those with high radiation grade and extreme temperature ranges. With outstanding radiation resistance, this sensor can easily withstand harsh, high-radiation environments: even after exposure to a total integrated neutron flux of 3×10²⁴ n/m² and a total integrated gamma-ray radiation dose of 10⁹ Gy, it continues to operate stably and reliably, meeting the stringent requirements of high-radiation environments such as the nuclear industry.
In addition to its outstanding radiation resistance, this sensor also boasts exceptional high- and low-temperature adaptability, making it suitable for a wide range of operating conditions. It can operate continuously and stably within a temperature range of −200°C to +550°C, and can withstand extreme temperatures of up to 600°C when not in operation. It meets the requirements of both cryogenic and ultra-high-temperature environments, and with its exceptional temperature range adaptability, it is capable of handling a variety of demanding temperature applications.
The ATX-XR series is manufactured using 100% inorganic materials. All materials are rigorously selected to ensure that the coefficients of thermal expansion of each component are highly compatible, thereby minimizing thermal stress caused by temperature fluctuations and preventing component deformation or performance degradation. All seams and joints are welded using high-temperature alloys or brazed with copper to ensure structural integrity and high-temperature stability; the leads are encased in stainless steel sheaths to provide temperature resistance, insulation, and electromagnetic interference (EMI) protection.
The ATX-XR series is compatible with ABEK SENSORS' signal conditioners, controllers, and display meters.
Radiation Basics
Certain applications require materials to be resistant to gamma radiation and neutron radiation, as well as capable of withstanding high temperatures. Before examining specific technical specifications and suitability for particular applications, it is necessary to first clarify the following working definitions and equivalence relationships.
Total integral neutron flux
The total neutron flux (also known as the neutron dose) is the integral of the neutron flux over time.
- Neutron flux: the total distance traveled by all neutrons per unit time and per unit volume
- Formula for calculating neutron flux:
Number of neutrons / Volume × Distance / Time = Neutron density × Neutron velocity
- Neutron density: the number of neutrons (n) per unit volume
- Formula for calculating the total neutron flux:
Neutron density × velocity × time = neutron density × distance
- Total neutron flux in units of:n/m³×m = n/m² (n: number of neutrons; m: meters) or use NVT (n/cm²)
- Unit conversion: 1 NVT = 10⁴ n/m²
Total Integrated Dose (TID) of Gamma Rays
Absorbed dose of ionizing radiation refers to the amount of radiation energy deposited per unit mass of material.
- Rad (radiation absorption dose): The amount of radiation that deposits 0.01 joules of energy per kilogram of material
- Gy: The amount of radiation that deposits 1 joule of energy per kilogram of matter (international standard unit)
- Unit conversion: 1 Gy = 100 rad
All radiation causes some degree of damage; therefore, the key question is: given that an object must maintain its operational performance specifications, what dose and type of radiation can it withstand? This tolerance level can only be estimated at best.
When radiation energy strikes an object, even if the energy levels of different radiation sources are equal, the extent of damage caused can vary significantly depending on the type of radiation (such as gamma rays or neutrons), and the mechanisms of damage may also differ fundamentally.
There are two methods for quantifying such differences:
- Determine the radiation flux density that the device can withstand without sustaining transient irreversible damage;
- Determine the total integrated flux that a device can absorb before it sustains damage due to radiation-induced “ageing failure.”
It is essential to strictly distinguish between the concepts of Flux Density and Total Integrated Flux.
There is no direct correlation between neutron flux and gamma radiation. Assuming that energy dissipation is the same for different radiation sources, the energy absorbed by a device will vary depending on its absorption cross section; if one attempts to convert these values based on equivalent damage levels, uncertainty will increase further due to the fundamental differences in the damage caused by different types of radiation.
Electrical Specifications
| Parameters | Description |
| Input Voltage: | 1 to 12V AC, 3V rms |
| Input Frequency: | 400 to 10k Hz, 2.5 kHz（rms) |
| Linearity Error: | <±0.5% or 1% FSO |
| Repeatability Error: | <0.01% (Full stroke） |
| Hysteresis Error: | <0.01%(Full strokel) |
Environmental Constraints
| Parameters | Description |
| Operating Temperature | -200°C to +550°C |
| Storage temperature: | -240°C to +600°C |
| Radiation resistance: | Total neutron flux: 3×10²⁴ n/m² |
| Radiation resistance: | Total cumulative gamma-ray dose: 10⁹ Gy |
| Working Pressure: | 20MPa |
| Impact resistance: | 10 G, (11 ms half-sine wave) |
| Vibration: | 10g, 2kHz |
| Housing Material: | SUS304 |
Wiring Connection
Dimensions
Double 2-core cables
Single metal cable O.D. 1.5mm.
Single 4-core cable
Metal cable O.D. 4mm
| Parameters | Range | Body length “A” | Dimension “B” | Dimension “C” | Sensitivity | |
| Range code | mm | mm | mm | mm | mV/V/mm | |
| 010 | ±5 | 0-10 | 109 | 42 | 30 | 30 |
| 030 | ±15 | 0-30 | 133 | 50 | 50 | 16 |
| 050 | ±25 | 0-50 | 192 | 76.2 | 80 | 14 |
Specialized Accessories
LVDT/RVDT Signal Conditioner
Extension Rod
