36
SECTION 3, continued
3.2.1 Priming the Reagents (optional)
Priming the reagents is an optional procedure that can reduce the start up time to
15 minutes. Proceed as follows:
1. Turn off the sample flow to the instrument.
2. Disconnect the reagent feed line after the “Y” fitting at the colorimeter.
3. Connect a syringe to the tubing coming from the “Y” fitting.
4. Loosen the two screws on the pump pinch plate enough that reagents can be
pulled through the reagent lines. Use the syringe to remove the air and fill the
lines with reagent.
5. Retighten the screws on the pump pinch plate until just snug.
Do not overtighten.
6. Remove the syringe from the tubing and reconnect the fitting on
the colorimeter.
3.3 Installing the Stir Bar
A small stir bar for the sample cell in the colorimeter assembly is included in the
installation kit furnished with the instrument. The stir bar must be installed for the
instrument to operate properly.
Install the stir bar as follows:
Remove the plug in the top of the colorimeter.
Drop the stir bar into the hole. See Figure 16. The bar should rest on the bottom of
the vertical bore.
Note: Make sure the stir bar drops down into the colorimeter and remains in the
colorimeter. Do not drop it into the drain line.
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