| 摘要 |
FIELD: photoelectric equipment. ^ SUBSTANCE: device has glass case mounted in housing. There is float inside the case. The float is mounted between IR transmitter and receiver in opposition to entrance and exit windows of the housing. Vertical access hole is made in housing, which has to be the float level gage. The window is oriented in such a manner that external light disturbance passes it through at angle of 90° to axis of photo detector beam. Case has opaque and grooved walls; parts intended for windows are made transparent. Entrance window is made in form of through double cone-shaped groove with light absorbing coating on its wall. Photochromic filter is mounted at the entrance of radiation source. The wall has slant provided with mirror surface and reflecting ring-shaped diaphragms. Access hole is provided with removable aid for attenuating external light illumination. ^ EFFECT: improved reliability of operation under excessive sun illumination. ^ 3 cl, 4 dwg |
