40 CFR Table 7
Calibration and Accuracy Requirements for Continuous Parameter Monitoring Systems
June 9, 2020
Open Table
| If you monitor this parameter . . . | Then your accuracy requirements are . . . | And your inspection/calibration frequency requirements are . . . |
|---|---|---|
| 1. Temperature (non-cryogenic temperature ranges). | ±1 percent of temperature measured or 2.8 degrees Celsius (5 degrees Fahrenheit) whichever is greater | Every 12 months. |
| 2. Temperature (cryogenic temperature ranges). | ±2.5 percent of temperature measured or 2.8 degrees Celsius (5 degrees Fahrenheit) whichever is greater | Every 12 months. |
| 3. Liquid flow rate | ±2 percent of the normal range of flow | a. Every 12 months. b. You must select a measurement location where swirling flow or abnormal velocity distributions due to upstream and downstream disturbances at the point of measurement do not exist. |
| 4. Gas flow rate | ±5 percent of the flow rate or 10 cubic feet per minute, whichever is greater | a. Every 12 months. b. Check all mechanical connections for leakage at least annually. c. At least annually, conduct a visual inspection of all components of the flow CPMS for physical and operational integrity and all electrical connections for oxidation and galvanic corrosion if your flow CPMS is not equipped with a redundant flow sensor. |
| 5. pH or caustic strength | ±0.2 pH units | Every 8 hours of process operation check the pH or caustic strength meter's calibration on at least two points. |
| 6. Conductivity | ±5 percent of normal range | Every 12 months. |
| 7. Mass flow rate | ±5 percent of normal range | Every 12 months. |
| 8. Pressure | ±5 percent or 0.12 kilopascals (0.5 inches of water column) whichever is greater | a. Calibration is required every 12 months. b. Check all mechanical connections for leakage at least annually. c. At least annually perform a visual inspection of all components for integrity, oxidation and galvanic corrosion if CPMS is not equipped with a redundant pressure sensor. |
Tried the LawStack mobile app?
Join thousands and try LawStack mobile for FREE today.
- Carry the law offline, wherever you go.
- Download CFR, USC, rules, and state law to your mobile device.
