| 摘要 |
1. A gas detector with a measuring head which has an electrolyte provided on opposite sides with electrodes (5, 6) and a diffusion chamber (9) arranged in front of the one electrode, which diffusion chamber is in communication with the gaseous atmosphere to be controlled via an inlet orifice plate (7) and a filter membrane (8), characterised in that a number of exchangeable orifice plate heads (1) is provided corresponding to the number of different measuring ranges, which orifice plate heads are in each case provided with a plurality of openings (7), the number and/or cross-section of which determine the total opening cross-section of the inlet orifice plate, the length I of which is small in comparison with the diameter d thereof and the diameter d is small in relation to the ratio of the active electrolyte surface F to length L the diffusion chamber (9). |
