7
SERVICE
62
H250 M40
www.krohne.com
03/2020 - 4000640706 - MA H250-M40 R06 en
7.1 Maintenance
Within the scope of routine maintenance of the system and pipelines, the flowmeter should also
be inspected for signs of fouling, corrosion, mechanical wear and leaks, as well as damage to
the measuring tube and the indicator.
We advise that inspections are carried out at least once per year.
The device must be removed from the pipeline before cleaning.
7.2 Replacement and retrofitting
Some components of the variable area flowmeter can be retrofitted:
•
Float damping
Indicator M40:
Indicator M40:
Indicator M40:
Indicator M40:
•
Limit switch module K1 / K2
•
Current output 4..20 mA ESK4A
•
Counter module with LCD and I/O ESK4-T
•
Fieldbus interface ESK4-PA / FF
7.2.1 Replacing floats
•
Remove the device from the pipeline.
•
Take the upper span ring out of the measuring unit.
•
Take the upper float stop and float out of the measuring unit.
•
Insert the new float into the centre hole of the lower float stop and push into the measuring
unit along with the upper float stop. While doing this, the float's upper guide rod must be
guided through the middle hole of the float stop.
•
Insert the span ring into the measuring unit.
•
Fit the device back into the pipeline.
CAUTION!
Pressurised pipes have to be depressurised before removing the device.
Empty the pipelines as completely as possible.
In the case of devices used for measuring aggressive or hazardous media, appropriate safety
precautions must be taken with regard to residual liquids in the measuring unit.
New gaskets have to be used when re-installing the device in the pipeline.
Avoid electrostatic charges when cleaning the surfaces (e.g. sight window)!
CAUTION!
Without a recalibration an additional measuring error is to be expected.
