---
kind: "section"
citation: "40 C.F.R. § 1065.269"
title: "40"
number: "1065.269"
heading: "Photoacoustic analyzer for ethanol and methanol."
url: "https://uscodex.org/cfr/40/1065.269"
---

# §1065.269. Photoacoustic analyzer for ethanol and methanol.

- (a) **Application.** You may use a photoacoustic analyzer to measure ethanol and/or methanol concentrations in diluted exhaust for batch sampling.
- (b) **Component requirements.** We recommend that you use a photoacoustic analyzer that meets the specifications in Table 1 of [§ 1065.205](/cfr/40/1065.205.md). Note that your photoacoustic system must meet the verification in [§ 1065.369](/cfr/40/1065.369.md) and it must also meet the linearity verification in [§ 1065.307](/cfr/40/1065.307.md). Use an optical wheel configuration that gives analytical priority to measurement of the least stable components in the sample. Select a sample integration time of at least 5 seconds. Take into account sample chamber and sample line volumes when determining flush times for your instrument.

## Notes

### Amendments

[79 FR 23761, Apr. 28, 2014]

### Authority

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

### Source

Source: 70 FR 40516, July 13, 2005, unless otherwise noted.

### Amendments

[79 FR 23761, Apr. 28, 2014]