KROHNE VFM 3100 EN - Manual (Page 40)

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• Continue to tighten in steps of 7 Nm (5 lb•ft) using the same
sequence. The maximum torque needed for safe operation is
34 Nm (25 lb•ft) per Figure 33.
• Reassemble the Electronic Module and preamplifier per
instructions starting on page 33.
Attach conduit connections and input wiring. See “Field
Termination” on page 19 and “Interconnection Wiring for
Remote Electronics” on page 13.
NOTE: Replacing the sensor will not cause a shift in the K-factor.
WARNING: In order to maintain agency certification of this product
and to prove the integrity of the parts and workmanship in containing
process pressure, a hydrostatic pressure test must be performed.
The VFM 3100 must hold for 1 minute without leaking the appropria-
te pressure from Table 11.
Model End Connection Test Pressure
VFM 3100 F - T ANSI Class 150 450 psi
PN 16 3,2 MPa
VFM 3100 F - T ANSI Class 300 1125 psi
PN 40 6 MPa
VFM 3100 F -T PN 64 9,6 MPa
VFM 3100 F -T ANSI Class 600 2250 psi
PN 100 15 MPa
VFM 3100 W-T All 15 MPa (2250 psi)
Figure 32: Connector Bolt Torquing Sequence
Figure 33: Connector Bolt Torquing Sequence
Table 11. Maximum Test Pressure
maximum torque 34 Nm
(25 lb•ft)