125 kV Rotating Anode X-Ray Tube Assembly
LQ16-XD51-20.40/125 for General Diagnostic Radiography
The LQ16-XD51-20.40/125 is a rotating anode X-ray tube assembly designed for general diagnostic radiographic applications. The manufacturer specification lists a maximum radiographic tube voltage of 125 kV, nominal focal spots of 1.0 mm and 2.0 mm, and nominal 0.1-second anode input power of 20 kW and 40 kW at 50 Hz for the small and large focal spots, respectively.
The assembly incorporates a 70 mm pure-tungsten-faced molybdenum target, a 17.5° target angle and high-voltage cable receptacles specified to IEC 60526 interface requirements. The complete X-ray tube assembly includes a housing; it should not be confused with an un-housed tube insert.
Key Technical Features
- Rotating anode design: a 70 mm pure-tungsten-faced molybdenum target with a 17.5° target angle.
- Dual focal spots: 1.0 mm small focus and 2.0 mm large focus for compatible radiographic operating configurations.
- Nominal input ratings: 20/40 kW at 50 Hz and 22/44 kW at 60 Hz (small/large focus, 0.1 s).
- Thermal specifications: 110 kJ (150 kHU) anode heat content and 1000 kJ (1410 kHU) total tube assembly heat content.
- Cooling options: manufacturer documentation identifies natural-air or forced-air cooling, depending on system installation.
- High-voltage connections: cable receptacles specified to meet the interface requirements of IEC 60526.
Electrical and Radiographic Specifications
| Model | LQ16-XD51-20.40/125 |
|---|---|
| Product type | Rotating Anode X-Ray Tube Assembly |
| Intended application | General diagnostic X-ray radiography |
| High-voltage generator | Constant-potential high-voltage generator; center-grounded circuit |
| Maximum radiographic tube voltage | 125 kV |
| Minimum tube voltage | 40 kV |
| Focal spot sizes | 1.0 mm (small) / 2.0 mm (large) |
| 0.1 s nominal anode input, 50 Hz | 20 kW (small) / 40 kW (large) |
| 0.1 s nominal anode input, 60 Hz | 22 kW (small) / 44 kW (large) |
| Anode speed | Approx. 2800 rpm at 50 Hz / 3200 rpm at 60 Hz |
| Maximum filament current | 5.5 A for each focal spot |
| Filament frequency limits | 0–25 kHz |
Target, Housing and Thermal Specifications
| Target construction | Pure tungsten-faced molybdenum |
|---|---|
| Target diameter / angle | 70 mm / 17.5° |
| Anode heat content | 110 kJ (150 kHU) |
| Maximum anode heat dissipation | 475 W (667 HU/s) |
| Complete assembly heat content | 1000 kJ (1410 kHU) |
| Nominal continuous input power | 275 W without air circulator / 450 W with air circulator |
| Inherent / additional filtration | 1.0 mm Al / 1.5 mm Al (3 × 0.5 mm Al) |
| Overall length / maximum diameter | 480 mm / 152.4 mm |
| Assembly weight | Approx. 17 kg |
| High-voltage receptacles | Specified to IEC 60526 interface requirements |
| Cooling method | Natural air or forced air, depending on system configuration |
Thermal capacity distinction: the 150 kHU figure refers to the rotating anode; 1410 kHU refers to the complete X-ray tube assembly. They are not interchangeable specifications.
E7239X Replacement Reference and Compatibility Review
This page may be considered when researching systems associated with the Canon E7239X reference. However, the LQ16-XD51 manufacturer specification does not certify it as a direct or universal replacement for an E7239X, and no installation compatibility is implied by similar voltage or focal spot values alone.
Before quoting or installing a replacement, the existing equipment’s technical documentation should be reviewed by a qualified X-ray service professional. The following details should be confirmed:
- Original X-ray tube model, tube housing and equipment manufacturer.
- Generator voltage range, exposure ratings and protective limits.
- Focal spot requirements, target angle and intended radiographic applications.
- Physical dimensions, mounting points, beam port orientation and available installation clearance.
- High-voltage connectors, grounding, stator connections and thermal safety switch integration.
- Cooling arrangement, anode heat loading and the complete system’s installation requirements.
Compatibility is subject to review. An original model number, system model and photos of the existing assembly help determine whether a proposed configuration should proceed to detailed technical evaluation.
Operating Conditions and Installation Safety
The manufacturer documentation specifies normal ambient operation at 10–40°C, relative humidity of 75% or less and atmospheric pressure of 70–106 kPa. These ambient conditions are separate from the housing’s specified operating temperature range.
Installation, service and electrical connection must be carried out by appropriately trained and qualified personnel. The manufacturer’s safety instructions cover generator overload protection, high-voltage discharge, grounding, protective housing, heat management and X-ray radiation safeguards. Refer to the current equipment-specific documentation before installation or operation.
Frequently Asked Questions
Is LQ16-XD51-20.40/125 an original Canon E7239X tube?
No such claim is made. LQ16-XD51-20.40/125 is the model identified in the supplied manufacturer’s specification. E7239X appears here as a research reference only, and compatibility must be checked separately.
What are the focal spot sizes and rated input power?
The manufacturer lists 1.0 mm and 2.0 mm focal spots. Nominal 0.1-second anode input power at 50 Hz is 20 kW for the small focus and 40 kW for the large focus.
Is the anode heat capacity 150 kHU or 1410 kHU?
The anode heat capacity is 150 kHU. The larger 1410 kHU specification refers to the heat content of the complete tube assembly.
What information is required before quotation?
Please provide the existing tube and X-ray system models, clear photos of the installed assembly, generator specifications, connection details, quantities and destination country. Technical fit must be reviewed before a replacement is recommended.
Request an X-Ray Tube Assembly Quotation
Contact UMY Medical with your existing X-ray tube model, generator details and destination country. We can review the LQ16-XD51-20.40/125 specification and clarify the information needed for a replacement assessment.
