Emerson 00825-0100-4530 Rev EC manual Damping, Alarm and saturation levels, Write protection

Quick Installation Guide March 2013

Damping

User adjusted damping affects the transmitter’s ability to respond to process changes. Therefore, the damping values + response time should not exceed the Safety loop requirements.

Alarm and saturation levels

DCS or safety logic solver should be configured to handle both High alarm and Low alarm. Table 3 identifies the alarm levels available and their operation values.1

Table 3. Alarm levels and operation values

Rosemount Alarm Level

				Normal Operation
3.75	mA1					21.75	mA2
		4 mA		20 mA
	3.9 mA				20.8 mA
	low saturation				high saturation
			Namur Alarm Level
				Normal Operation
3.6	mA1					22.5	mA2
		4 mA		20 mA
	3.8 mA				20.5 mA
	low saturation				high saturation

1.Transmitter Failure, hardware or software alarm in Low position.

2.Transmitter Failure, hardware or software alarm in High position.

It is assumed that the current output signal is fed to a Safety Integrity Level 2 (SIL2) -compliant analog input board of a safety logic solver. For instructions on alarm level settings, see the Rosemount 5300 Series Reference Manual (Document No. 00809-0100-4530), “Analog Output (HART)” section.

NOTE:

Only the High or Low Alarm Mode can be used for the Safety Function. Do not choose Freeze Current as an error will not be announced in the current loop.

Write protection

A Rosemount 5300 transmitter can be protected from unintentional configuration changes by a password protected function. It is recommended to use write protection described in the Rosemount 5300 Series Reference Manual (Document No. 00809-0100-4530), “Write Protecting a Transmitter” section.

1)In certain cases, the transmitter does not go into the user defined alarm state. For example, in case of a short circuit, the transmitter goes into High Alarm state even if Low Alarm has been configured.

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