Reference Manual
00809-0100-4302, Rev BA
January 2008
5-3
Rosemount 1153 Series B
SENSING MODULE
CHECKOUT
NOTE
Numbers in parentheses refer to item numbers in Figure 5-2 on page 5-4.
The sensing module (12) is not field-repairable and must be replaced if
defective. If no defect such as a punctured isolating diaphragm or loss of fill
fluid is observed, check the sensing module in the following manner:
1.
Disengage the header assembly board (4) as described in step four
of the electrical housing disassembly procedure on page 5-5. You
need not remove the sensing module from the electrical housing for
checkout.
2.
Jump connections 1 and 2 on the header assembly board (see Figure
5-1 on page 5-2).
3.
Using a low-voltage ohmmeter, check the resistance between the
jumper wire and the sensing module housing. This resistance should
be greater than 10 M
Ω
. Remove the jumper wire.
4.
Jump connections 3 and 4 on the header assembly board and repeat
step 3 (see Figure 5-1).
NOTE
The above procedure does not completely test the sensing module. If circuit
board replacement does not correct the abnormal condition and no other
problems are obvious, replace the sensing module.
DISASSEMBLY
PROCEDURE
NOTE
Numbers in parentheses refer to item numbers in Figure 5-2 on page 5-4.
NOTE
The Rosemount 1153 Series B Pressure Transmitter contains electronic
circuit boards which may be static sensitive.
Process Flange Removal
NOTE
Read the Process Flange Reassembly Procedure on page 5-8 before
attempting disassembly. Special testing and traceability are required.
1.
Remove the transmitter from service before disassembling flanges.
2.
Detach process flanges (13, 15) by removing the four large bolts (14).
Take care not to scratch or puncture the isolating diaphragms.
Identify high and low (“H” and “L”) flanges for reassembly.
Process O-rings may retain some process fluid after disassembly of
process flanges. If this fluid is determined to be contaminated, take
appropriate safety measures.
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