| 摘要 |
A photometric measuring apparatus having a measuring chamber which can be cut off from extraneous light when a sample vessel is inserted and removed from the open end of the measurement chamber. A plunger, having a light-tight seal, movable vertically and horizontally on a pivotable arm driven by a drive mechanism for sealing the measuring chamber after a sample vessel is inserted in the measuring chamber. A guide means comprising a cylindrical guide tube having a guide groove on its surface which acts as cam means for controlling the vertical and horizontal movement of the plunger. The drive mechanism includes a drive motor and photocells for controlling the drive of the motor and vertical movement of the plunger and drive of the motor until the sample vessel upon which measurements have been completed are removed. The drive motor is spring mounted and actuates a microswitch to interrupt the motor drive when the drive is obstructed by the operator.
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