ULVAC HELIOT Helium Leak Detector Repair Service
We provide independent expert repair service for the complete ULVAC HELIOT product family. Our technical team has in-depth knowledge of the HELIOT vacuum system, mass spectrometer analyser, electronics, and control systems — based on official ULVAC engineering documentation and extensive hands-on service experience. We repair at your facility, anywhere in the world. All work is conducted in English.
Inside the HELIOT — What We Repair
Equipment We Repair
| Series | Models |
|---|---|
| HELIOT 900 | 901W1, 901D2, 904W2, 904D3, 904D4 |
| HELIOT 710 | 711W1, 714W2, 714D2, 714D3, 711D1 |
| HELIOT 700 | Full series |
| HELIOT 301 | — |
| HELIOT MONO | Integration module |
| HELIOT ZERO | Compact modular unit |
What We Repair
Vacuum System
- Turbomolecular pump — performance degradation, bearing noise, vibration faults
- Rotary vane pump — oil contamination, vane wear, seal replacement
- Dry scroll pump — end plate, tip seal, bearing replacement
- Solenoid valves — seal replacement, coil faults, mechanical seizure
- Vacuum manifold — internal O-ring replacement (8 positions per manufacturer specification)
- Pirani gauge sensors — replacement of WP-01 or WP-16
Mass Spectrometer Analyser
- Ion source IS-BA1 — replacement, performance verification
- Filament failure — cartridge replacement
- Sensitivity loss — systematic diagnosis including ion source, TMP, and vacuum leak check
- High background — helium contamination diagnosis and purging
Electronics and Control
- Controller communication faults (RS-232C, RS-485)
- EXT.I/O signal faults — open collector output testing
- Setpoint configuration — factory default restoration, parameter adjustment
- Tablet controller — connectivity issues, software reset
- Power supply faults — internal power rail diagnosis
- Compatibility mode configuration — 700/710, 300, ZERO signal formats
Calibration System
- Internal calibration leak — drift diagnosis, temperature/decay compensation verification
- Calibration procedure verification against external reference standard
- External calibration leak configuration
Common Faults and Causes
| Symptom | Likely causes |
|---|---|
| Sensitivity loss | Ion source wear; TMP performance degradation; leak in vacuum circuit |
| High helium background | Helium contamination in TMP or analyser; recent sniffer mode use |
| Fails to reach test pressure | Valve fault; O-ring leak; backing pump fault |
| Controller communication error | Cable fault; RS-232C configuration mismatch; PC driver issue |
| TMP alarm | TMP control circuit fault; bearing degradation; power interruption |
| Calibration drift | Internal calibration leak age; temperature instability |
Repair Process
- Initial contact — describe the fault by email (model, serial number, symptoms, error codes)
- Remote assessment — we review the description and request controller logs if available
- Remote guidance — for operator-level faults, we may resolve remotely at no travel cost
- On-site visit — if remote resolution is not possible, we propose a visit date
- On-site diagnosis — systematic fault isolation using official ULVAC diagnostic procedures
- Repair — component replacement, adjustment, cleaning
- Performance verification — leak rate measurement, calibration check, sensitivity test
- Service report — written English-language report of all work performed
Contact
Email: mail@ulvacheliot.com
Please include: equipment model, serial number (if available), description of the fault, your location, and urgency level. We will respond within 1–2 business days.