Room lights should be left on and an appropriate warning sign should be placed on the door. Unattended operations, which may continue for several hours or overnight, should be approved by the laboratory supervisor. Many of these operations utilize water as the coolant in condensers. Either a decrease or increase in water pressure can have serious consequences. Lower pressure, typical in the early morning as water usage increases, can result in a slower flow and inadequate cooling.
Higher pressures can cause leaks, separation of connections and flooding.
When setting up unattended operations, regulate the water pressure automatically via the installation of a water pressure regulator. The regulator should be protected by an appropriate filter to prevent clogging. Monitor the water flow so that in the event of interruption, electricity and water supply can be turned off. The latter is necessary because a break in a connection can result in flooding. Position the monitor at some point after the water has passed through the apparatus and is on its way to the drain.