KROHNE OPTIMASS with MFC 300 EN - Manual (Page 69)

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8.8 Purge Port Meters and Burst Disc Meters
Purge Port Options
If the purge port option was selected at time of order, then your meter will be fitted with 1/4"
NPT female connections – these will be clearly identified. These connections are sealed with
NPT plugs and PTFE tape.
Important:
Do not remove these plugs.
The meter is factory sealed with a dry nitrogen gas fill and any ingress of moisture will damage
the meter. The plugs should only be removed to purge the inside of the meter case of any
product if it is suspected that the primary measuring tube has failed. This must only be done
after the meter has been depressurised and removed from service. This should be done as
soon as soon as it is safe to do so!
Burst Disc Meters
OPTIMASS 8000 or 9000 meters that have been ordered with a burst (rupture) disc will be sup-
pled with the disc fitted. The disc failure pressure is 20barg @ 20°C.
Important:
The burst disc is suitable for the designed application according to the process conditions and
flow rates as per original order. If conditions alter, consult KROHNE for further advice regard-
ing suitability of disc fitted.
If the product is in any way hazardous, it is strongly recommended that an exhaust tube is con-
nected to the ¾" NPT male thread of the burst disc so that the discharge can be piped to a safe
area. This tube should be large enough that pressure cannot build up in the meter case.
Ensure arrow on burst disc is pointing away from meter.