---
kind: "section"
citation: "43 C.F.R. § 3175.132"
title: "43"
number: "3175.132"
heading: "Testing of reference accuracy."
url: "https://uscodex.org/cfr/43/3175.132"
---

# §3175.132. Testing of reference accuracy.

- (a) The following reference test conditions must be maintained for the duration of the testing:
  - (1) Ambient air temperature must be between 59 °F and 77 °F and must not vary over the duration of the test by more than ±2 °F;
  - (2) Relative humidity must be between 45 percent and 75 percent and must not vary over the duration of the test by more than ±5 percent;
  - (3) Atmospheric pressure must be between 12.46 psi and 15.36 psi and must not vary over the duration of the test by more than ±0.2 psi;
  - (4) The transducer must be isolated from any externally induced vibrations;
  - (5) The transducer must be mounted according to the manufacturer's specifications in the same manner as it would be mounted in normal field operations;
  - (6) The transducer must be isolated from any external electromagnetic fields; and
  - (7) For reference accuracy testing of differential-pressure transducers, the downstream side of the transducer must be vented to the atmosphere.
- (b) Before reference testing begins, the following pre-conditioning steps must be followed:
  - (1) After power is applied to the transducer, it must be allowed to stabilize for at least 30 minutes before applying any input pressure or temperature;
  - (2) The transducer must be exercised by applying three full-range traverses in each direction; and
  - (3) The transducer must be calibrated according to manufacturer specifications if a calibration is required or recommended by the manufacturer.
- (c) Immediately following preconditioning, the transducer must be tested at least three times for accuracy under [§ 3175.131(h)](/cfr/43/3175.131.md?p=h). The results of these tests must be used to determine the transducer's reference accuracy under [§ 3175.135](/cfr/43/3175.135.md).

## Notes

### Source

Source: 81 FR 81609, Nov. 17, 2016, unless otherwise noted.

### Authority

Authority: 25 U.S.C. 396d and 2107; 30 U.S.C. 189, 306, 359, and 1751; and 43 U.S.C. 1732(b), 1733, and 1740.

### Source

Source: 81 FR 81421, Nov. 17, 2016, unless otherwise noted.