公开(公告)号：DE1948625A1

公开(公告)日：1970-04-09

申请号：DE1948625

申请日：1969-09-26

Applicant: NUCLEAR CHICAGO CORP

Inventor： ALLEN HUGHES LEONARD ,  JAMES TRESSEL WILLIAM ,  RICHARD FLAVELL EVAN

IPC: G01N21/25 ,  G01N21/27 ,  G01J3/48

Abstract: 1,252,470. Photo-electric colorimeters. NUCLEAR-CHICAGO CORP. Sept. 26, 1969 [Oct. 1, 1968], No.47411/69. Headings G1A and G1J. [Also in Division G3] A photo-electric colorimeter comprises an unscaled meter to which can be added one of a plurality of inter-changeable scales or dials, which when placed in position causes switching into circuit of a respective photo-cell, responsive to light of a particular wavelength range, so that the colorimeter may be used to investigate a liquid sample as regards the particular constituent for which the dial is designed. The colorimeter comprises a housing 20 with controls 14-18, a temperature controlled rack 32, 22 for samples awaiting test and a test well 31, 21. The temperature control circuit is illustrated in Fig. 10 (not shown) as is a transistorized timer circuit which lights an alarm lamp after a first period and sounds a loudspeaker after a second period warning the operator when the sample incubation period has expired. A typical scale or dial 40, has notches (43-46) Fig. 2 (not shown) in a unique combination arranged to actuate certain of members 73-76 on insertion and so switch into circuit a particular photo-cell 65-68. The dial comprises a transparent plate carrying the scale and is held by springs engaging notches 47. Alternatively to notches, conductive elements in particular configurations on the plate can switch in the photo-cells. In an alternative apparatus, a number of dial members may be inter-connected to form a continuous belt which is fed through an adapted slot. Insertion of a test vial 80 brings it between the ends of fibre optic light guides 55-58 and aligned photo-cells 65-68, individually responsive to particular wavelength ranges. The light guides have numbers of fibres appropriate to their respective photo-cells and are fed by a common lamp (51) via lens (52) and infrared absorbing filter (54), Fig. 8 (not shown). Supply circuitry for lamp and photo-cells is given in Fig. 10 (not shown). Calibration of each scale or dial is with a known sample by a potentiometer (16) so as to locate the indicator pointer 29 on a calibration mark usually centrally located on the scale. The test sample may be blood and a variety of tests for particular blood constituents are exemplified, together with details of the required wavelength response of the photo-cells for particular components.