Shimadzu Option Parts Axial Sensor Unit Assy 1003 for TMP-803/ 1503 Series Molecular Pumps

The Shimadzu Axial Sensor Unit Assy 1003 is an original replacement option part designed for axial position sensing in TMP‑803 and TMP‑1503 series molecular pumps. This axial magnetic float sensor assembly detects axial displacement of the rotor and provides critical feedback to the pump controller for stable rotor levitation and reliable high‑vacuum performance. It is supplied as a direct OEM repair part for maintenance and refurbishment of Shimadzu TMP series turbo molecular pumps.

Key features

• OEM original design for TMP‑803 and TMP‑1503 series—drop‑in replacement (Assy 1003).
• High‑precision axial sensing for stable rotor axial control and minimized contact risk.
• Robust construction suitable for vacuum environment and long service intervals.
• Compact assembly for straightforward mechanical fit and electrical connector compatibility with standard Shimadzu controllers.
• Supplied ready for installation with sealing surfaces compatible with existing pump housings.

Applications and compatibility

Intended for use in Shimadzu TMP‑803 and TMP‑1503 series turbo molecular pumps where the axial sensor has reached end of life, has been damaged, or where improved reliability is required after rotor/service events. Confirm compatibility with your pump variant and controller firmware before installation; the sensor assembly is specifically matched to the TMP‑803/1503 magnetic bearing geometry and control signals.

Typical benefits

• Restores precise axial position feedback to minimize vibration and prevent rotor touchdown.
• Helps recover pump performance and extend operational lifetime after sensor degradation.
• Reduces downtime by using a direct OEM spare rather than a modified aftermarket part.

Basic technical notes

• Part designation: Axial Sensor Unit, Assy 1003 (original Shimadzu option part).
• Function: axial position sensing / magnetic float detection for rotor axial control.
• Interface: mechanical mounting and electrical connector compatible with standard TMP‑803/1503 controllers—ensure connector seating and pin alignment during installation.
• Materials: vacuum‑compatible materials and finishes to minimize outgassing in high‑vacuum operation.

Installation overview (recommended procedure)

1. Bring the pump to a safe, powered‑down state and isolate from the system vacuum; follow facility lockout/tagout and Shimadzu service instructions.
2. Vent the pump to atmospheric pressure using approved procedures before opening the pump housing.
3. Remove the pump housing or access cover to expose the axial sensor—work in a clean area to prevent particle contamination.
4. Disconnect the electrical connector and gently remove the existing axial sensor assembly.
5. Install the new Assy 1003, ensuring sealing faces are clean and fasteners are torqued to Shimadzu recommended values.
6. Reconnect the sensor cable, verify connector orientation, reassemble housing, and perform rotor spin‑up and sensor calibration per the pump controller procedure.

Maintenance and handling

• Handle the sensor with ESD protection and avoid touching sensor surfaces or optical/electronic elements directly.
• Inspect wiring and connectors during routine maintenance intervals; replace the assembly if sensor output is noisy, intermittent, or out of spec.
• Keep the interior of the pump clean; particles or deposits near the sensor can affect readings and magnetic bearings.
• Use only compatible cleaning agents—avoid aggressive solvents on seals and sensor components.

Troubleshooting (common symptoms of sensor issues)

• Increased vibration or axial instability during spin‑up — sensor may be degraded or misaligned.
• Controller alarms related to axial position, zero‑offset errors, or frequent recentering events.
• Intermittent rotor trips or unexpected shutdowns—inspect wiring and connector seating first, then the sensor assembly.

Ordering, accessories and support

When ordering, specify the pump model (TMP‑803 or TMP‑1503), your pump serial number, and request Assy 1003 axial sensor assembly as the replacement item. For original Shimadzu option parts and related maintenance components, refer to the manufacturer's non‑standard maintenance parts page or contact your authorized supplier for lead times and shipment options.

Related pages and resources:

• Shimadzu molecular pump non-standard maintenance parts — reference for option parts and non‑standard components.
• Shimadzu molecular pump non-standard maintenance parts — supplier page for ordering and compatibility inquiries.
• Shimadzu molecular pump non-standard maintenance parts — product family and service part listings.

Packaging and warranty

The axial sensor assembly is shipped in protective, clean packaging to preserve vacuum‑grade surfaces. Warranty and service terms vary by supplier—please confirm warranty coverage, return policy, and service options with the selling distributor or with Shimadzu authorized service before purchase.

Safety and compliance

• Only trained technicians should perform replacement and calibration—follow Shimadzu service manuals and safety guidelines.
• Observe vacuum and electrical safety practices; ensure all steps are carried out in a contamination‑controlled workspace.

If you need assistance confirming fitment, replacement procedures, or lead time, contact your authorized Shimadzu service provider or the parts supplier with the pump model and serial number ready for a fast response.