Manual

<6. SERVICE>

6-1

IM 01R01B30-00E-E 5th edition January 01, 2013 -00

Service

6.1.1 Function test

Checking free movement of pointer:

- Remove housing cover (4 screws).

- After deecting the pointer by hand, it must return to measurement value. If the pointer pivots to different

values upon repeated deections, there is too much friction in the bearings. In this case, send indication unit

to service.

Checking free movement of oat:

- First, free movement of pointer has to be ascertained.

- Check visually if pointer follows each ow rate change. If not, clean oat and measuring tube.

Unit with electronic transmitter:

- Without ow, the output current must be 4 mA. At a ow rate of 100% the current must be 20 mA.

If only the pointer is moved to 100%, the current may not exeed 17mA.

6.1.2 Measuring tube, oat

The Rotameter does not normally require any maintenance. However cleaning is necessary if the measuring

cone or at has been contaminated by the process. To clean, the Rotameter must be removed from the

pipeline.

For all kind of intervention in the Rotameter like tightening the packing of the valve the pressures in pressurized

pipelines has to be reduced. Take care that the counter screw is tighten after screwing the valve.

Disassembling the tube

Please perform the following steps to clean the measuring tube and the oat:

• Disassemble the Rotameter from the pipe

• Unscrew hollowed top threaded bolt (6) (for cone 31 – 43)

resp. remove top snap ring and socket (for cone 44 – 51)

resp. only top snap ring (for cone 52 – 53)

• Remove top oat stop (3)

• Disassemble oat – Attention: Do not bend the oat

• For version with valve in the inlet remove rst the top head pipe plug (8)

• For version with valve in the outlet remove rst the lower head pipe plug;

in that case the disassembling of all parts start from down to top

• Cleaning of metering tube and oat

• To clean the valve loose screw nut (10) in the head. Afterwards you can unscrew spindle (12) with PTFE

packing box plus thrust collar (9)

Please don’t expose the oat to any strong magnetic alternating elds. The oating body and particularly

its measuring edge may not be damaged.

Assembling the tube

Mounting starts in opposite sequence.

Assembling the oat take care that the lower guide bar of the oat is xed in the middle boring of the lower

stop. The guide bar should not be bended.

IMPORTANT

6.1 Maintenance