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40 Micro Motion 3098 Gas Specific Gravity Meter
Maintenance and Fault Finding
2. Use two of the removed M6 bolts to jack the meter from its housing using the two threaded
holes found in the mounting housing (item 6).
WARNING! Do not try to lever the unit out – this
will damage the sealing O-ring and the vibrating element.
The aperture left in the 3098 specific gravity meter by this removal should be covered to stop dust or
dirt getting into the meter chamber. The meter itself can now be taken to a clean environment to be
serviced further.
The density meter is refitted by locating it in the top plate and lowering it until it sits on the sealing
O-ring.
IMPORTANT! Do not force the meter in place by pushing downwards.
Tighten the four bolts in sequence to gradually ease the meter into place. The bolts holding the density
meter in place should be tightened to a maximum torque of 10 Nm and should be treated with
proprietary thread locking compound (for example, Loctite).
The meter amplifier housing can be easily removed by releasing the clamp that holds it to the meter
body (mounting housing) and undoing the spoolbody wire connections inside. A more detailed
description of the electronics inside the housing is given in Chapter 3.
5.4.3 Reference chamber diaphragm removal (Figure 5-3)
The diaphragm that regulates the sample gas pressure to that of the reference chamber is held in
between the welded assembly and the base plate. The following procedure shows how to access and
service this part.
The figure below shows two views for clarity with top plate and pipework not shown.
Figure 5-3 Reference chamber diaphragm section
1. As the diaphragm produces a gas tight seal for the reference chamber, before any servicing of
this part is done, the reference chamber must be vented to atmospheric pressure.
2. With the 3098 specific gravity meter out of its enclosure (see Section 5.4.1) remove the three
unit feet and stand the metalwork upright.
3. Using a 9/16
″ spanner, undo and remove the two gas pipes that connect the base plate to the
top plate.
Diaphragm
Base Plate
Reference Chamber