8 purge port meters and burst disc meters, 9 technical data – KROHNE OPTIMASS with MFC 300 EN User Manual
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18
Minimum flow rate
Depending on measuring error required.
4.8 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 ½”
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. 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 (Meters up to size 25 only)
OPTIMASS 1000 meters that have been ordered with a burst (rupture) disc will be suppled with
the disc fitted. The disc is fitted when the operating pressure of the measuring tube exceeds
the design pressure of the secondary containment. 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 disc fitted.
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.
Ensure arrow on burst disc is pointing away from meter
4.9 Technical Data
Maximum Flow Rates
Weights (PN40 flanges)
15
25
40
50
kg
lbs
kg
lbs
kg
lbs
kg
lbs
Compact with aluminium MFC 300
13.5
30
16.5
36
29.5
65
57.5
127
Compact with SS MFC 300
18.8
41
21.8
48
34.8
77
62.8
138
Remote with aluminium J box
11.5
25
14.5
32
25.5
56
51.5
113
Remote with SS J box
12.4
27
15.4
34
26.4
58
52.4
115
15
25
40
50
Kg/h
6,500
27,000
80,000
170,000
Lbs/min
239
992
2,940
6,247