KROHNE VFM 3100 EN - Manual (Page 35)

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• Remove shield covering the Preamplifier and disconnect
the ground lead from U-shaped metal strap on the mounting
plate (Figure 24).
• Disconnect (brown-red-orange-yellow) wires from both sides of
the terminal block and remove strain relief clamp holding remote
cable. Refer to Figure 23.
• Disconnect yellow and brown sensor leads from terminal block
on the preamplifier and loosen strain relief clamp holding the
sensor cable.
• Unscrew the two mounting screws to remove mounting plate
from junction box.
• Turn the mounting plate (with preamplifier) upside down and
unscrew the two screws to remove preamplifier. Save the
screws, mounting plate assembly, cover lock assembly,
preamplifier shield with screws, and ground strap.
Ground wire
Cover look
assembly
Terminal block
Lockwasher
Mounting screw
Preamplifier assembly
Figure 24: Preamplifier - Remote Mounted VFM 3100
(CENELEC Certified Flameproof)
4.4.2. Replacing the Preamplifier
The replacement preamplifier is shipped in a protective anti-static
plastic bag with two tie wraps for dressing of wires. Do not remove
the preamplifier from this bag until it is ready to be installed in a
VFM 3100. This will prevent damage due to accidental electrostatic
discharge.
NOTE: An electrostatic mat will prevent electrostatic discharge
Remove the new preamplifier from its protective bag and follow the
installation procedure in “Integral Mounted VFM 3100” on page 36
and in “Remote Mounted VFM 3100” on page 36.
CAUTION: Before proceeding, make sure that power to
VFM 3100 is OFF.