Cleaning of the Instrument

When the tests have been completed, the instrument should be cleaned as follows:

1. Close the Whitey valve and open the burette cock and allow the caustic solution to drain into the level bottle. Discard the caustic solution if it has become weak or, if still good, store in a sealed glass container for future use.
2. Open the Whitey valve, fill the level bottle with warm water and raise the level bottle above the top of the burette. Fill the burette with warm water until it overflows at the caustic trap.
3. Lower the level bottle and allow the water in the burette to drain through the Whitey valve and also back into the level bottle. Repeat step #2 several times or until all traces of caustic solution have been drained from the burette and fittings.
4. The pressure gauge should be removed from the gauge adapter (5039), rinsed in warm water and then dried.

Note: Caustic solution will eventually discolor the Tygon™ Plastic connection tubing (5052) and also cause deterioration of the rubber coupling (5046). If this condition occurs, the parts should be replaced.

Calibration of Pressure Gauge:

The pressure gauge should be tested for accuracy at the beginning of each shift. Procedures for re-calibration are sent with the instrument and are available upon request from Zahm & Nagel Co.