Emerson Rosemount 8800D Series Safety Manual

This procedure assumes that you are familiar with plant procedures. For details on how to
do any of the following steps, see the product reference manual.
Procedure
1. Take appropriate action to avoid a false trip by electronically bypassing the safety
Programmable Logic Controller (PLC).
2. Inspect flowmeter for any leaks, visible damage or contamination.
3. Verify that the transmitter does not indicate alarms or warnings using HART host or
LCD.
4. Cycle power and use HART communications to retrieve any diagnostics and take
appropriate action.
5. Disable write protection (see Section 2.3).
6. Using the Loop Test function, send a HART command to the transmitter to go to the
high alarm current output and verify that the analog current reaches that value.
• Loop Test can be found at Service Tools > Simulate > Analog Output > Loop Test.
• High alarm and low alarm levels can be found in the product reference manual.
This step tests for compliance voltage problems, such as low voltage on the loop
power supply, or increased wiring resistance.
7. Send a HART command to the transmitter to go to the low alarm current output and
verify that the analog current reaches that value.
This step tests for possible failures related to quiescent current.
8. Exit fixed current mode.
9. Compare the process flow with the Low Flow Cutoff, and do one of the following:
Option
Description
Process flow greater than Low
Flow Cutoff
Confirm measured flow compares reasonably to an
independent measurement.
Process flow less than Low
Flow Cutoff
Check output at 2 points using internal flow simulation,
with at least one point between LFC and URV.
10. Verify all safety-critical configuration parameters (see Section 2.2).
11. Enable write-protection (see Section 2.3).
12. Remove the bypass and otherwise restore normal operation.
13. Document the results of this proof test as part of your plant safety management
procedures.
3.8
Comprehensive proof test
The comprehensive proof test is recommended for all Rosemount 8800D Series SIL 2/3
Capable Vortex Flowmeters.
Proof tests
Safety Manual 17

Emerson Rosemount 8800D Series Specifications

General

Brand	Emerson
Model	Rosemount 8800D Series
Category	Measuring Instruments
Language	English