Emerson Alarm Level Verification, Transmitter, Security, Rosemount 3051N, Reference Manual

Rosemount 3051N

Reference Manual

00809-0100-4808, Rev CA June 2008

Electrical shock can result in death or serious injury.

•Avoid contact with the leads and terminals. High voltage that may be present on leads can cause electrical shock.

FAILURE MODE ALARM Rosemount 3051N transmitters automatically and continuously perform self-diagnostic routines. If the self-diagnostic routines detect a failure, the transmitter drives its output outside of the normal saturation values. The transmitter will drive its output low or high based on the position of the failure mode alarm jumper. See Table 2-1for failure mode and saturation output levels. To select alarm position, see “Configuring Transmitter Alarm and Security Jumper Procedure” in Section 2.

Table 2-1. Standard Alarm and

Saturation Values.

	4–20 mA	4–20 mA
Level	Saturation	Alarm
Low	3.9 mA	≤ 3.75 mA
High	20.8 mA	≥ 21.75 mA

Alarm Level Verification

NOTE

You can alter the actual transmitter mA output values by performing an analog output trim.

NOTE

When a transmitter is in an alarm condition, the hand-held HART Communicator indicates the analog output the transmitter would drive if the alarm condition did not exist. The transmitter will alarm high in the event of failure if the alarm jumper is removed.

Transmitters allow verification testing of alarm current levels. If you replace the LCD meter, reconfigure or make any changes to the transmitter, verify the transmitter alarm level before you return the transmitter to service. This feature is also useful in testing the reaction of your control system to a transmitter in an alarm state. To verify the transmitter alarm values, perform a loop test and set the transmitter output to the alarm value (see Table 2-1 and “Loop Test” in Section 2).

TRANSMITTER	There are three security methods with the Rosemount 3051N transmitter:
SECURITY

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