Patent ID: 7586610
Filing Date: 2009-09-08
Classification: G01N

Abstract:
1. A component measuring device for measuring at least one of a quantity or a property of a given component in a specimen by colorimetrically measuring a test member, comprising: a tip mount for removably mounting a tip having the test member; a photometric unit having a light-emitting element for applying light to said test member of said tip for measurement, a light-detecting element for detecting light reflected by said test member, and a holder in which is accommodated said light-emitting element and said light-detecting element; a light-shielding test tip for being removably mounted on said tip mount, wherein said holder has a passage for passing said light and said reflected light therethrough, and a light-transmissive member is disposed in a portion of said holder which is adapted to face said test member; and stain detecting means for detecting a stain on said light-transmissive member based on an amount of light detected by said light-detecting element when light is emitted from said light-emitting element while said test tip is mounted on said tip mount, wherein said stain detecting means is arranged to determine that there is a stain on said light-transmissive member if an amount of light detected by said light-detecting element is greater than a threshold.