Replacing Printed Wiring Assembly (Pwa); Table 42 Process Head Bolt Torque Ratings; Table 43 Replacing Pwa - Honeywell ST 3000 User Manual

Torque ratings Table 42 lists process head bolt torque ratings for given transmitter type.
Meter Body Process Head
Type Bolting Size
Draft Range 7/16 x 14 UNC
Transmitter
7/16 x 20 UNF
M12 x 1.75
All Other DP, M12 x 1.75
GP and AP
Transmitters
7/16 x 20 UNF
7/16 x 14 UNC
3/8 x 16 UNC
M8 x 1.25
5/16 x 18 UNC

Replacing Printed Wiring Assembly (PWA)

About the PWA Electronics Board
The circuitry in the ST 3000 Release 300 transmitters is of the single PWA design. The PWA contains
connectors for the flex-tape conductor from the sensor, the loop power wires and a connector for the
optional smart meter cable.
The procedure in Table 43 outlines the steps for replacing the PWA.
Step
1 Turn OFF transmitter power.
ATTENTION
We recommend that you remove the transmitter from service and move it to a clean area
before taking it apart..
2 Loosen end cap lock and unscrew end cap from electronics side of transmitter housing.
ESD HAZARD
We recommend that you use a ground strap or ionizer when handling the PWA, since
electrostatic discharges can damage certain circuit components.
3 a)
10/05

Table 42 Process Head Bolt Torque Ratings

Carbon Steel –
Standard; no option
specified
20,3 N-m +/- 1,0 N-m
[15.0 Lb-Ft +/- 0.8 Lb-Ft]
NA
25,8 N-m +/- 1,3 N-m
[19.0 Lb-Ft +/- 1.0 Lb-Ft]
63,7 N-m +/- 3,2 N-m
[47.0 Lb-Ft +/- 2.4 Lb-Ft]
NA
67,8 N-m +/- 3,4 N-m
[50.0 Lb-Ft +/- 2.5 Lb-Ft]
39,3 N-m +/- 2,0 N-m
[29 Lb-Ft +/- 1.5 Lb-Ft]
27,1 N-m +/- 1,4 N-m
[20.0 Lb-Ft +/- 1.0 Lb-Ft]
NA

Table 43 Replacing PWA

If equipped with a local smart meter, carefully turn smart meter counterclockwise to
remove it from PWA mounting bracket and unplug cable from connector on back of meter
ST 3000 HART Transmitter Release 300 User Manual
9— Maintenance - Replacing Printed Wiring Assembly (PWA)
Bolting Type
B7M Bolting Stainless Steel NACE
["B7" Option] ["CR" Option]
20,3 N-m +/- 1,0 N-m 20,3 N-m +/- 1,0 N-m
[15.0 Lb-Ft +/- 0.8 Lb-Ft] [15.0 Lb-Ft +/- 0.8 Lb-Ft]
NA 25,8 N-m +/- 1,3 N-m
[19.0 Lb-Ft +/- 1.0 Lb-Ft]
NA NA
NA NA
NA 63,7 N-m +/- 3,2 N-m
[47.0 Lb-Ft +/- 2.4 Lb-Ft]
48,8 N-m +/- 2,4 N-m 56,9 N-m +/- 2,8 N-m
[36.0 Lb-Ft +/- 1.8 Lb-Ft] [42.0 Lb-Ft +/- 2.1 Lb-Ft]
NA 39,3 N-m +/- 2,0 N-m
[29 Lb-Ft +/- 1.5 Lb-Ft]
NA NA
NA 20,3 N-m +/- 1,0 N-m
[15.0 Lb-Ft +/- 0.8 Lb-Ft]
Action
316 Stainless Steel
Non-NACE ["SS"
Option]
20,3 N-m +/- 1,0 N-m
[15.0 Lb-Ft +/- 0.8 Lb-Ft]
NA
NA
NA
NA
56,9 N-m +/- 2,8 N-m
[42.0 Lb-Ft +/- 2.1 Lb-Ft]
39,3 N-m +/- 2,0 N-m
[29 Lb-Ft +/- 1.5 Lb-Ft]
NA
20,3 N-m +/- 1,0 N-m
[15.0 Lb-Ft +/- 0.8 Lb-Ft]
100