Canon ROTANODE E7239X rotating anode X-ray tube assembly — 125 kV, dual 2.0 / 1.0 focal spots, 47 kW anode input.
Product Overview
The E7239X is a Canon ROTANODE rotating anode X-ray tube assembly for general diagnostic radiography. It carries a 74 mm rhenium-tungsten faced molybdenum target with 2.0 and 1.0 focal spots, and is rated to 125 kV with 47 kW large-focus anode input.
It is supplied as a replacement or build tube for veterinary radiography systems. The IEC 60526 high-voltage receptacles and XS-AV stator make it a direct fit for systems already specified around this housing; the tube housing model number is XH-121.
Key Features
- Rhenium-tungsten faced molybdenum target, 74 mm diameter, 16° anode angle — the alloy facing resists the surface crazing that shortens the life of plain tungsten targets
- Dual focal spots 2.0 and 1.0 — large focus for thorax and abdomen at short exposure, small focus for extremity and dental detail
- 47 kW large-focus anode input at 0.1 s (60 Hz), 22.5 kW small focus — short exposures on thick anatomy
- Anode heat content 100 kJ (140 kHU) with 475 W maximum dissipation — sustained list throughput without a forced cooling stop
- Tube assembly heat content 900 kJ (1250 kHU)
- Anode speed minimum 3200 rpm at 60 Hz — heat spread over a larger focal track per exposure
- IEC 60526 high-voltage receptacles — standard cable fit, no adapter
- Permanent filtration 0.9 mm Al at 75 kV, with additional filtration to 2.4 mm Al available
- Leakage technique factors 125 kV, 4 mA per IEC 60601-1-3
- Natural or forced air cooling; 16 kg, 479 mm overall length
- CE marked under Regulation (EU) 2017/745, Class IIb, notified body BSI Netherlands (2797)
Visual Evidence
Technical Specifications
| Model | E7239X (ROTANODE series) |
| Manufacturer | Canon Electron Tubes & Devices Co., Ltd. (Japan) |
| Type | Rotating anode X-ray tube assembly, general diagnostic radiography |
| Tube housing model | XH-121 |
| IEC classification | Class I ME equipment (IEC 60601-1:2005+A1:2012) |
| Nominal X-ray tube voltage | 125 kV radiographic |
| Minimum tube voltage | 40 kV |
| Maximum anode (or cathode) to ground | 62.5 kV |
| Nominal focal spot values | Large 2.0 / small 1.0 |
| Nominal anode input power (0.1 s) | Large focus 47 kW at 60 Hz, 42.5 kW at 50 Hz; small focus 22.5 kW at 60 Hz, 21 kW at 50 Hz |
| Maximum tube current | Large focus 570 mA; small focus 340 mA |
| Maximum filament current | 5.1 A, both foci |
| Filament voltage at 5.1 A | Large focus 7.7–10.4 V; small focus 5.8–7.8 V |
| Filament frequency limits | 0–25 kHz |
| Target | Rhenium-tungsten faced molybdenum, 74 mm diameter, anode angle 16° |
| Anode speed | Minimum 3200 rpm at 60 Hz; minimum 2700 rpm at 50 Hz |
| Stator type | XS-AV |
| Stator ratings | Starting 1050 W at 200 V / 6.0 A, speed-up 0.8 s; running 270 W at 100 V / 3.0 A; capacitor 24 µF |
| Stator resistance | Common–main 27.5 Ω; common–auxiliary 58.0 Ω |
| Housing to low-voltage terminal resistance | Minimum 2 MΩ |
| Anode heat content | 100 kJ (140 kHU) |
| Maximum anode heat dissipation | 475 W (667 HU/s) |
| Tube assembly heat content | 900 kJ (1250 kHU) |
| Nominal continuous input power | 180 W (15 kHU/min) without air circulator |
| Continuous anode input power | 60 W (85 HU/s) |
| Permanent filtration | 0.9 mm Al at 75 kV (IEC 60522:1999) |
| Additional filtration available | 0.4–1.5 mm combinations, maximum 2.4 mm Al at 75 kV |
| Leakage technique factors | 125 kV, 4 mA (IEC 60601-1-3:2008) |
| X-ray coverage | 354 × 354 mm at SID 750 mm |
| High-voltage receptacle | IEC 60526 Corrigendum 1:2010 |
| Cooling | Natural or forced air |
| Mode of operation | Intermittent |
| Housing temperature, normal operating range | 16–75 °C |
| Overall length | 479 mm |
| Maximum diameter | 152.4 mm |
| Weight | Approx. 16 kg |
| Operating environment | 10–40 °C, 30–85% RH non-condensing, 70–106 kPa |
| Shipping and storage | −20 to 70 °C, 20–90% RH non-condensing, 50–106 kPa |
| Regulatory | Regulation (EU) 2017/745, Class IIb (Rule 10); notified body BSI Group The Netherlands B.V. (2797), certificate MDR 762704 |
Clinical Applications
- General veterinary radiography — thorax, abdomen, spine and pelvis on large focus
- Extremity and skull detail on small focus
- Equine limb radiography where 125 kV headroom and 47 kW input shorten exposure
- Replacement tube for existing veterinary radiography systems built around the XH-121 housing
- New system builds requiring an IEC 60526 receptacle fit and XS-AV stator drive
Installation & Service Notes
- Confirm the generator can drive an XS-AV stator: starting 1050 W at 200 V, running 270 W at 100 V, 24 µF capacitor
- Load the tube data into the generator after fitting — heat storage 900 kJ, large focus 47 kW / 570 mA, small focus 22.5 kW / 340 mA. A generator still holding the previous tube’s data will either refuse exposures or over-drive the new tube
- High-voltage receptacles are IEC 60526; clean the plugs and apply silicone compound before insertion
- The assembly is glass-based inside. Mechanical shock above 2 G can break it — handle and transport accordingly
- Connect the housing ground terminal and the thermal switch to the generator; the switch inhibits further exposure when the housing reaches its trip temperature
- Fit beam-limiting equipment (a collimator) on the X-ray port. The tube must not be operated without one
- Housing is lead-lined and oil-filled. Dispose of a failed assembly through the appropriate regulated route, not as general waste
Package Contents
- E7239X rotating anode X-ray tube assembly (housing XH-121)
- Manufacturer product information sheet
Downloads & Documentation
Why Choose E7239X
- Rhenium-tungsten faced target and 3200 rpm anode spread heat over a larger focal track — the two factors that decide how many exposures a tube survives
- 47 kW large-focus input shortens exposure on thick anatomy, which is where motion blur and retakes come from
- IEC 60526 receptacles and the XS-AV stator make this a drop-in for systems already built around the XH-121 housing
- Full manufacturer rating data and an EU declaration of conformity are on file — the tube can be specified against documented figures, not a supplier summary
Warranty & Support
FAQ
Will it fit my existing system? Mechanically, if the system is built for the XH-121 housing — 479 mm long, 152.4 mm maximum diameter, 16 kg, IEC 60526 receptacles. Electrically, the generator must drive an XS-AV stator and accept the tube’s rating data. Send us the model of the tube being replaced and we will confirm.
What are the focal spot sizes? Nominal focal spot values 2.0 (large) and 1.0 (small), per IEC 60336.
How much heat can it take? Anode heat content 100 kJ (140 kHU), maximum anode dissipation 475 W (667 HU/s), and tube assembly heat content 900 kJ (1250 kHU). Without an air circulator, nominal continuous input is 180 W (15 kHU/min).
Does the generator need reconfiguring after fitting? Yes. Tube data must be reloaded — heat storage and the per-focus kW and mA limits. Skipping this step is the most common cause of a new tube failing early.
Is a collimator required? Yes. Beam-limiting equipment must be mounted on the X-ray port. We supply collimators separately.
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