High Voltage DC Relay Helium Leak Detector Safety Guidelines
1. Critical Safety Protocols
1.1 Power Isolation
▶︎ Always de-energize high-voltage DC relays before leak testing. Verify zero energy state using a certified voltage tester.
1.2 Personal Protective Equipment (PPE)
▶︎ Mandatory use of:
10kV insulated gloves (ASTM D120 standards)
ANSI Z87.1-rated safety goggles
Flame-resistant lab coat
2. Equipment Maintenance & Inspection
| Component | Check Frequency | Acceptance Criteria |
| Helium supply lines | Pre-operation | No cracks, pressure ≤0.5 MPa |
| Pressure gauges | Weekly | Calibration cert. valid |
| Vacuum sensors | 50 operating hours | Response time <2 seconds |
▶︎ Immediate action required if:
Helium concentration deviation >5%
Gauge drift ≥±2% full scale
3. Gas & Environmental Controls
3.1 Helium Specifications
Purity: ≥99.995% (Grade 5.0)
Pressure: 1.5–2.0 bar (per EN ISO 20486)
3.2 Environmental Limits
+ Optimal: 20°C±3°C / 30–50% RH
! Restricted: >35°C or <15°C / >70% RH (risk of false positives)
4. Standard Operating Procedure (SOP)
5. Emergency Response
▶︎ Helium exposure symptoms:
Dizziness or voice distortion → Evacuate area immediately
Contact with liquid He → Flush skin with water (15 mins)
▶︎ Leak detector alarm triggers:
Shut off helium supply valve
Activate ventilation system
Report via Form HSE-007 within 1 hour
