Maintenance And Care Of The Avs 470 Viscosity Measuring Unit And The Viscometers; Maintenance Intervals Normal Operation; Maintenance Work To Be Carried Out; Maintenance And Care Of The Vz 7215 Absorbent Bottle - Fisher AVS 470 Manual De Instrucciones

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Chapter 6 Maintenance and care of the AVS 470 Viscosity Measuring Unit and the viscometers
6 Maintenance and care of the AVS 470 Viscosity Measuring Unit and
the viscometers
Maintaining the proper functioning requires certain inspection and maintenance work. Maintenance and
service work includes:
- Visual check: Display front foil
- ViscoPump II
- Once per quarter, the electrical contacts have to be inspected for corrosion, if the viscosity
measuring unit is used in premises with an occasional occurrence of corrosive matters in their
atmosphere.
Maintaining the proper functioning of the AVS 470 Viscosity Measuring Unit requires certain inspection and
maintenance work.
6.1

Maintenance intervals Normal operation:

As a rule, the max. intervals for carrying out all work is 6 months
Under particular strain: As a rule, the max. intervals for carrying out all maintenance work are 4 weeks.
In case of disturbances:
If any disturbance, malfunction, or other defect becomes obvious, the work has to be carried out
immediately.
6.2

Maintenance work to be carried out

- Check the hoses, screwed connections for signs of visible damage, contamination, and leaks.
- Check the electrical plug contacts for corrosion and mechanical damage (on the AVS 470 Viscosity
Measuring Unit and on the cables).
- If necessary, the exterior of the casing of the viscosity measuring unit can be cleaned with a piece of
cloth soaked with a household cleaning agent. The lower and rear sections have to be dry-treated.
In no case must liquid penetrate into the interior of the lower section.
- Defective parts must be repaired or replaced with new ones. Defective glass parts must always be
replaced.
6.3

Maintenance and care of the VZ 7215 absorbent bottle

The VZ 7215 absorption traps which prevent contaminations from penetrating into the pneumatic system of
the ViscoPump have to be inspected at regular intervals. If soda lime is used as an absorption agent with
acidic solvents, the colour condition of the indicator is to be checked on a daily basis. As soon as this
condition has shifted to BLUE in the half of the absorber material, this is the very last moment to replace the
material for safety reasons.
Please note: If such a colour shift cannot be observed over an extended period of time, this may be
attributable to the fact that an acidic over-saturation of the material has caused a de-colouration; this may
then appear as "normal", but it will definitely result in the destruction of the pneumatic system after some
time. This situation is explicitly excluded from the warranty coverage!
When using activated carbon as an absorption agent (e.g. with solvents or used mineral oils), a replacement
should be made at intervals between 1 and 2 weeks; this depends on the load factor which depends on the
volatility of the materials.