ISO/TC 146/SC 3
| Project No. | ISO 23431:2021 |
|---|---|
| Title | <p>This document describes methods for determining air speed and flow direction, CO, NO and NO<sub>2</sub> concentrations and visibility in road tunnels using direct-reading instruments. This document specifically excludes requirements relating to instrument conformance testing.</p> |
| Registration number (WIID) | 75571 |
| Scope | <p>This document describes methods for determining air speed and flow direction, CO, NO and NO<sub>2</sub> concentrations and visibility in road tunnels using direct-reading instruments. This document specifically excludes requirements relating to instrument conformance testing.</p> |
| Status | Standarts spēkā |
| ICS group | 13.040.20 93.060 |