Honeywell SmartLine, User Manual

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7. Maintenance/Repair
7.3. Inspecting and cleaning barrier diaphragms
Revision 2 SmartLine Wireles User's Manual 67
WARNING
Risk of death or serious injury by explosion. Do not open transmitter
enclosure when an explosive gas atmosphere is present.
Procedure
Table 7-1: Inspecting and Cleaning Barrier Diaphragms
Step Action
1
Close all valves and isolate transmitter from process. Open vent in process head to drain fluid
from transmi
tter’s meter body, if required.
ATTENTION
We recommend that you remove the transmitter from service and move it to a clean area
before taking it apart.
WARNING
Risk of death or serious injury by explosion. Do not open transmitter enclosure when an
explosive gas atmosphere is present.
2
Remove nuts from bolts that hold process head or heads to meter body. Remove process
heads and bolts. See
Figure 7-1
3
Remove gasket and clean interior of process head using soft bristle brush and suitable solvent.
CAUTION
Diaphragm surface is fragile. Be very gentle, do not damage.
4
Inspect barrier diaphragm for any signs of deterioration or corrosion. Look for possible residue
and clean if necessary.
If diaphragm is dented, has distorted convolutions or radial wrinkles, performance may be
affected. Contact Honeywell for assistance.
5
Replace process head gasket.
ATTENTION

We recommend that you install a new gasket whenever a process head is removed for
cleaning.
For process heads of a GP or AP transmitter with dual-head design, see illustration for
differential pressure transmitters in
Figure 7-1.
6
Coat threads on process head bolts with anti-seize compound such
as “Neverseize” or
equivalent.
7
Replace process head or heads and bolts. Finger tighten nuts.
8
Use a torque wrench to gradually tighten nuts to torque rating shown in Table 7-2 , and in
sequence shown in Figure 7-1 . Tighten head bolts in stages of 1/3 full torque, 2/3 full torque,
and then full torque.
9
Return transmitter to service.