opaque cover. Measure the sample at the sample port through the glass bottom of the sample cup with the instrument in the port-up orientation.
Orange Juice Tube Holder (45°/0° instruments only)
This holder is designed to allow the viewing of a 1-inch glass test tube of orange juice by the instrument through a viewed area equivalent to that of the optional 0.75-inch port plate. The orange juice tube holder option includes a special mounted black glass for standardization and is recommended for use along with the Sample Clamp/Port-Forward Stand.
To install the orange juice holder, first install the instrument onto the sample clamp/port-forward stand as described earlier in this chapter. Then, remove the regular port plate from the instrument port and replace it with the tube holder port plate. Orient the port plate so that the larger opening in the tube holder portion is facing upward. Insert the alignment pin on the tube holder into the small alignment hole at the top of the instrument port. When the pin is properly installed into the hole, the tube holder should be held firmly in the upright position at the instrument port and should not be allowed to rotate.
Then, standardize the instrument with the normal 0.75-inch port plate
in place. Replace the 0.75-inch port plate with the orange juice tube holder port plate. To use the orange juice tube holder, fill the 1-inch glass tube with orange juice and insert the tube into the tube holder from the top.
Citrus Option (45°/0° instruments only)
This option provides three additional indices that may be calculated and displayed in Universal’s color data displays, Citrus Red, Citrus Yellow, and Citrus Number. Install the indices after installation of Universal by copying the CMRINDEX.CDX file contained on the option diskette into your Universal installation directory (C:\UNIVERSE by default). The citrus scales will then be available for use through Universal whenever the ColorFlex is the active instrument.