Barnstead D4631 120 VAC Operation Manual - page 16

1 6

Leaking canisters.

Large O-ring on cartridge holder

is missing, damaged or not

installed properly.

Replace or position correctly.

Short cartridge life.

Cartridges being used are

beyond expiration date.

Check the expiration date.

Cartridges begin to lose capacity

after being stored two years from

the date of manufacture. Replace

the cartridges with unexpired

ones.

Change in feedwater

characteristics.

If a Barnstead ROpure is the

feedwater source, check that the

membrane is functioning

properly.

If a Barnstead Still is the

feedwater source, ensure that

the distillate temperature to the

E-pure

®

 does not exceed 49°C

(120°F.)

If tap water is the feedwater

source, check the quality of the

water. In some cases the quality

of the water will change with the

seasons. Changing the source

(city water to well water, or well

water to city water) will result in a

water quality change.

If feedwater is from a central water

purification system, verify water

quality and proper functioning of

the system.