A. P. Buck - Model VSS-1 VSS-5 VSS-12 - Validated Sampling System Instruction Manual

The BUCK-VSS Series pumps have two multifunction keys that change their functions depending on what Menu or Sub-Menu you are in. You must first stop pump Operation with HOLD before you can turn the pump off with OFF. Also to Reset parameters or flow rate, change date or time, or access any of the other functions in the Main Menu. This gives you the programming and operational flexibility for changing media or flow rates, shift sampling, interrupted and ad hoc sampling and other situations where you may just want to pause the pump without actually turning it off. Pressing ENTER at any flashing Menu or sub-Menu selection or value highlighted by a cursor enters or accepts that Menu selection or value and moves you to the next level in that Menu or sub-Menu.