Emerson Rosemount 644 with HART Protocol User Manual

83
Reference Manual
00809-0200-4728, Rev SA
Safety Instrumented Systems (SIS) Certification
July 2018
Safety Instrumented Systems (SIS) Certification
Figure 7-1. Alarm Levels
7.5 Operation and maintenance
7.5.1 Proof test
The following proof tests are recommended. In the event that an error is found in the safety
functionality, proof test results and corrective actions taken must be documented at
Emerson.com/Rosemount/Safety
.
All proof test procedures must be carried out by qualified personnel.
7.5.2 Partial proof test 1
The partial proof test 1 consists of a power cycle plus reasonability checks of the transmitter output.
Reference the FMEDA Report for percent of possible DU failures in the device.
FMEDA report can be found at Rosemount 644 Temperature Transmitter
product page.
Required tools: Field Communicator, mA meter
1. Bypass the safety PLC or take other appropriate action to avoid a false trip.
2. Send a HART command to the transmitter to go to high alarm current output and verify that the
analog current reaches that value. This tests for compliance voltage problems such as low loop
power supply voltage or increased wiring resistance. This also tests for other possible failures.
3. 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 tests for possible quiescent current related failures.
Rosemount alarm level
Namur alarm level
Custom alarm level
(3)(4)
(1) Transmitter Failure, hardware or software alarm in LO position.
(2) Transmitter Failure, hardware or software alarm in HI position.
(3) High alarm must be at least 0.1 mA higher than the high saturation value.
(4) Low alarm must be at least 0.1 mA lower than the low saturation value.
Normal Operation
4 mA
20 mA
20.5 mA
high saturation
21.75
(2)
3.9 mA
low saturation
3.75 mA
(1)
Normal Operation
4 mA
20 mA
20.5 mA
high saturation
21.0
(2)
3.8 mA
low saturation
3.6 mA
(1)
Normal Operation
4 mA
20 mA
20.5–22.9 mA
high saturation
21.0–23.0
(2)
3.5–3.75 mA
(1)
3.6–3.85 mA
low saturation

Emerson Rosemount 644 with HART Protocol Specifications

General

Brand	Emerson
Model	Rosemount 644 with HART Protocol
Category	Transmitter
Language	English