Performing maintenance
CTU 2xxx series
en-US
Page 77 / 108
BeWa CTU2000 3160738h en-us 2018-11-15.docx
2018-11-15
Cleaning the door
Clean the see-through door regularly.
CAUTION
Electrostatic charging
Warning of uncontrolled electrical discharge
►
Always clean the door with a moist, lint-free
cloth.
►
Do not use a dry cloth.
Statically charged door
In certain circumstances, the door can become statically charged.
One possible cause of this is when two non-conducting substances, e.g.,
CTU gloves (neoprene), see-through door (Makrolon), cleaning cloths
(cellulose or cotton), are rubbed against one another, thus causing static
charge to build up.
Discharging may be slowed down by the ambient conditions, such as dry air
and low external temperatures.
The "G 60 Spezial" test fluid (a hydrocarbon) results in an unusual effect: A
film that looks like a pasty mass forms on the inside of the see-through door.
The build-up of static charge counteracts the low surface tension of the
hydrocarbon mixture.
If the same fluid is transferred from the statically charged surface to a surface
with no charge, the fluid will be distributed in the usual manner.
Rinse down the inside of the door with more test fluid.
Remedy:
•
Adjust the humidity in the surroundings.
•
Always clean the door of the CTU with damp cloths.
•
If there is a lot of static, use a commercial anti-static product.
