Emerson 1154 manual Preliminary Connecting the Electrical Housing to the Sensor Module, Rosemount

Reference Manual

00809-0100-4514, Rev BA January 2008

Rosemount 1154

Preliminary

Connecting the Electrical Housing to the Sensor Module

Electrical Housing

Reassembly

1.Replace the cover O-rings (2) whenever you remove a cover. Clean the sealing areas with alcohol, if necessary, and lightly grease the O-ring with Dow Corning 55 Silicone O-ring Grease (Rosemount P/N 01153-0248-0001 or P/N 01153-0053-0001). Spray the inside threads of the electronics covers with cover lubricant (Rosemount P/N

01153-0333-0001 or equivalent) if necessary; if covers are already sufficiently lubricated, do not spray.

2.Verify that the circuit boards are clean.

3.Verify that the bayonet pins on the connection board are clean.

4.If you remove the sensor module, clean the thread sealant from the sensor module threads, lock nut, and electronics housing threads with a wire brush.

1.Run the lock nut down to the base of the sensor module threads.

2.Apply a heavy, continuous bead (about 3/8-in. wide) of Loctite®

580-PST sealant (RMT P/N 01153-0329-0001) around the top sensor module threads.

3.Insert the header assembly board (4) through the hole in the bottom of the electronics housing.

4.Screw the sensor module (12) into the electrical housing (3) making sure that five full threads are engaged. Be careful not to damage or twist the sensor leads. Turn the header board to avoid

twisting wires.

5.Align the sensor module with the high and low pressure sides oriented per Figure 2-5 on page 2-7.Alternately, tighten the module one-half turn further to reverse the orientation of the module about the electronics housing.

6.Tighten the lock nut (9) to 35 ft-lb (48 N-m) torque.

7.Wipe off excess sealant.

8.Place the assembled unit in an oven at 200 ±5 °F (93 ± 3 °C) for 12 hours to cure the sealant.

1.Replace the zero and span adjustment screw O-rings (19) whenever you remove the zero and span adjustment screws (16). Lightly grease the O-rings with Dow Corning 55 Silicone O-ring Grease (Rosemount P/N 01153-0248-0001 or P/N 01153-0053-0001). Reinstall the adjustment screws and secure with snap rings (18).

2.Align the zero and span adjustment screws with the potentiometer stems on the calibration board (5) and push the calibration board onto the bayonet pins.

3.Slide the header assembly board (4) onto the bayonet pins with the component side toward the pins. Slide any excess wire behind the calibration board, taking care to avoid kinks.

4.Push the amplifier board (6) onto the bayonet pins and secure with holding screws (7). Use nominal torque of 10 in-lb (1.1 N-m).

5.Carefully replace the cover and tighten to 16.5 ft-lb (22.4 N-m) (“Preliminary” on page 5-7).

6.Replace the nameplate (17), and secure with two nameplate screws (20).

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