KROHNE OPTIMASS with MFC 300 EN - Manual (Page 42)

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6.7 Purge Port Meters and Burst Disc Meters
Purge Port Options
If the purge port option was selected at the time of order, then your meter will be fitted with ¼"
NPT female connections and 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. If it is suspected that the
primary tube has failed, depressurise and remove the meter from service, as soon as it is safe
to do so.
Burst Disc meters:
OPTIMASS 3000 meters that have been ordered with a burst (rupture) disc will have the disc
fitted during manufacture. The burst disc option MUST be ordered for applictions where the
operating pressure of the measuring tube, exceeds the design pressure of the secondary con-
tainment. The disc failure pressure is 20bar @ 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 the fitted disc.
If the product is in any way hazardous, it is strongly recommended that an exhaust tube is con-
nected to the 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.
Make sure that the arrow on the burst disc is pointing awa ay from the meter.
Heating Jacket & Purge Port dimensions
01 03 04
All flanges All flanges All flanges
mm
A 129 ±5.0
B 45° ±6.0
C 45° ±6.0
D 45° (approx)
inches
A 5.01 ±0.2
A
B C
D