Safety Instrumented Systems

Quick Installation Guide

Rosemount 2051

00825-0100-4101, Rev EA June 2010

The following section applies to 2051 transmitters used in SIS applications.

NOTE

Transmitter output is not safety-rated during the following: configuration changes, multidrop, loop test. Alternative means should be used to ensure process safety during transmitter configuration and maintenance activities.

DCS or safety logic solver must be configured to match transmitter configuration. Figure 10 identifies the two alarm level available and their operation values. Position the alarm switch to the required HI or LO alarm position.

Installation

No special installation is required in addition to the standard installation practices outlined in this document. Always ensure a proper seal by installing the electronics housing cover(s) so that metal contacts metal.

The loop must be designed so the terminal voltage does not drop below 10.5 Vdc when the transmitter output is 22.5 mA.

Position the security switch to the “ON” position to prevent accidental or deliberate change of configuration data during normal operation.

Configuration

Use any HART-compliant master to communicate with and verify configuration of the 2051.

User-selected damping will affect the transmitters ability to respond to changes in the applied process. The damping value + response time must not exceed the loop requirements.

Figure 10. Alarm Levels

Rosemount Alarm Level

			Normal Operation
3.75		3.9 mA	4 mA	20 mA	20.8 mA	21.75(2)
mA	(1)
	low saturation			high saturation

Namur Alarm Level

Normal Operation

3.6 mA(1)

22.5(2)

3.8

20.5

low saturation

high saturation

(1)Transmitter Failure, hardware alarm in LO position.

(2)Transmitter Failure, hardware alarm in HI position.

NOTE

Some detected faults are indicated on the analog output at a level above high alarm regardless of the alarm switch selection.