Emerson Rosemount 3051 Manual page 50

Rosemount Model 3051 Transmitter with F
Reassemble the Process
Connection to the
Sensor Module
See "Safety Messages" on page 4-1 for complete warning information.
4-6
TM
fieldbus Protocol
OUNDATION
4. Replace the electronics housing cover. The transmitter covers must
be engaged metal-to-metal to ensure a proper seal and to meet
explosionproof requirements.
1. Visually inspect the Teflon (PTFE) sensor module O-rings. If the
O-rings are undamaged, you may reuse them. If the O-rings show
signs of damage, such as nicks or cuts, or if there is any doubt
about their ability to seal properly, replace them with new O-rings.
NOTE
If you are replacing the O-rings, be careful not to scratch the O-ring
grooves or the surface of the isolating diaphragm when removing the
damaged O-rings.
2. Install the process flange on the sensor module. To hold the process
flange in place, install the two hex head alignment screws. These
screws are not pressure retaining and need only be finger tight. Do
not overtighten; this will affect the module/flange alignment.
3. Install the appropriate flange bolts.
a. IF the installation requires a
four 1.75-inch flange bolts. Go to Step f.
b. IF the installation requires a
four 2.88-inch process flange/adapter bolts. EXCEPTION: For
gage pressure configurations, use two 2.88-inch bolts and two
1.75-inch bolts. Go to Step d.
c. IF the installation uses a three-valve manifold (differential
pressure applications only), THEN use four 2.25-inch manifold
flange bolts. Go to Step e.
d. Hold the flange adapters and adapter O-rings in place while
finger-tightening the bolts. Go to Step g.
e. Align the process flange with the three-valve manifold.
f. Finger tighten the bolts.
g. Tighten the bolts to the inital torque value using a crossed
pattern. See Table 4-1 for appropriate torque values.
h. Tighten the bolts to the final torque value using a crossed
pattern. See Table 4-1 for appropriate torque values. When
fully tightened, the bolts should extend through the top of the
module housing.
i. If the installation uses a three-valve manifold, then install
flange adapters on the process end of the manifold using the
1.75-inch flange bolts supplied with the transmitter.
1 / –18 NPT mounting, THEN use
4
1 / –14 NPT mounting, THEN use
2