---
kind: "section"
citation: "40 C.F.R. § 86.516-90"
title: "40"
number: "86.516-90"
heading: "Calibrations, frequency and overview."
url: "https://uscodex.org/cfr/40/86.516-90"
---

# §86.516-90. Calibrations, frequency and overview.

- (a) Calibrations shall be performed as specified in [§§ 86.517 through 86.526](/cfr/40/86.517..86.526.md).
- (b) [Reserved]
- (c) At least monthly or after any maintenance which could alter calibration, the following calibrations and checks shall be performed:
  - (1) Calibrate the hydrocarbon analyzer, methane analyzer, carbon dioxide analyzer, carbon monoxide analyzer, and oxides of nitrogen analyzer (certain analyzers may require more frequent calibration depending on particular equipment and uses).
  - (2) **Calibrate the dynamometer.** If the dynamometer receives a weekly performance check (and remains within calibration), the monthly calibration need not be performed.
  - (3) **Check the oxides of nitrogen converter efficiency.**
- (d) At least weekly or after any maintenance which could alter calibration, the following calibrations and checks shall be performed:
  - (1) [Reserved]
  - (2) Perform a CVS system verification, and
  - (3) **Run a performance check on the dynamometer.** This check may be omitted if the dynamometer has been calibrated within the preceding month.
- (e) The CVS positive displacement pump or Critical Flow Venturi shall be calibrated following initial installation, major maintenance or as necessary when indicated by the CVS system verification (described in [§ 86.519](/cfr/40/86.519.md)).
- (f) Sample conditioning columns, if used in the CO analyzer train, should be checked at a frequency consistent with observed column life or when the indicator of the column packing begins to show deterioration.

## Notes

### Amendments

[54 FR 14546, Apr. 11, 1989, as amended at 58 FR 58423, Nov. 1, 1993; 60 FR 34354, June 30, 1995]

### Source

Source: 42 FR 1137, Jan. 5, 1977, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Amendments

[54 FR 14546, Apr. 11, 1989, as amended at 58 FR 58423, Nov. 1, 1993; 60 FR 34354, June 30, 1995]