Category | Severy | Copper | Silver |
---|---|---|---|
G1 | Mild | <300 Å | <200 Å |
G2 | Moderate | <1,000 Å | <1,000 Å |
G3 | Harsh | <2,000 Å | <2,000 Å |
GX | Severe | >2,000 Å | >2,000 Å |
ISA Severity | MTBF Reduction |
---|---|
G1 | None |
G2 | up to 25% |
G3 | up to 50% |
GX | more than 75% |
Risk | Action | Part number |
---|---|---|
Temperature | Ideal temperature is 21°C (70F) with a ±1°C temperature change | ENV-TEMP or ENV-THUM |
Humidity | rH should be below 55% and not change more than 6% per hour | ENV-THUM |
Air Circulation | Air filtration and purification is paramount to keep corrosive contaminants out of the facility. Minimum 3 air changes per hour should be performed | ENV-AIRPRESSURE or ENV-AIRFLOW |
Particles | Air particles from PM1 to PM10 should be kept below 70µg/m3. Particles larger than 1mm should be below 1,000µg/m3 | ENV-PARTICLE or ENV-DUST |
Corrosive Gasses | Following limits in parts per billion (ppb) apply to mild environments: H2S <3 ppb SO2 <10 ppb CL2 <1 ppb NOx <50 ppb HF <1 ppb NH3 <500 ppb O3 <2 ppb |
ENV-GAS-H2S ENV-GAS-SO2 ENV-GAS-CL2 ENV-TVOC ENV-GAS-HF ENV-GAS-NH3 ENV-GAS-O3 |