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38 Micro Motion 3098 Gas Specific Gravity Meter
Maintenance and Fault Finding
5.4.1 Main meter (3098 specific gravity meter) removal (Figure 5-1)
The instructions in this section apply only to 3098 specific gravity meters supplied with an enclosure
(see Safety guidelines on page 1). In all other cases, please refer to the system installer.
1. Ensure that the 3098 specific gravity meter has been isolated from the gas and electrical
supplies. Vent the instrument to atmospheric pressure. The reference chamber may remain
charged with gas unless a reference chamber diaphragm requires servicing.
2. Disconnect the 3098 specific gravity meter externally from the system pipework at the side of
the enclosure having vented the reference chamber (if required). Cover all exposed gas
connections.
3. The 3098 specific gravity meter may be removed from its installation while still inside its
enclosure, or it can be separated at this stage, leaving the box in situ. If the latter is required
then continue from 5.
4. The enclosure can now be removed from its installation by unscrewing the four mounting feet
fixings.
5. Once the electrical wiring has been disconnected from the meter and the cable removed from
the gland, the instrument can be further dismantled. The 3098 specific gravity meter
metalwork can be removed from the enclosure as described in steps 6–8 and transported to a
clean area for further servicing.
6. Remove the enclosure door by pulling out the two retaining pins. Undo the three Swagelok
pipe fittings that connect the gas lines to the unit at the enclosure wall (item a). When this is
done, remove the two recess headed screws that hold the unit’s mounting bracket to the rear of
the enclosure (item b).
7. Loosen and remove the three bolts at the base of the box that hold the unit’s feet (item c).
8. Carefully remove the unit from the enclosure by moving it to the right to disengage the pipes
from their fittings. Take the metalwork to a clean area.
9. The 3098 specific gravity meter is installed using this procedure in reverse order. All gas pipe
connections will require leak testing.
For some gases, such as methane, it is imperative to vent the reference chamber to
atmospheric pressure whenever the 3098 specific gravity meter has to be taken off-line.