Emerson 4500 manual Alarm and Saturation Level Configuration

Rosemount 4500

Reference Manual

00809-0100-4027, Rev AA December 2005

Table 3-1. Rosemount

(Standard) Alarm and Saturation

Values

Table 3-2. NAMUR-Compliant Alarm and Saturation Values

Table 3-3. Custom Alarm and Saturation Values

Level		4–20 mA Saturation	4–20 mA Alarm
Low		3.9 mA	≤ 3.75 mA
High		20.8 mA	≥ 21.75 mA
Level		4–20 mA Saturation	4–20 mA Alarm
Low		3.8 mA	≤ 3.6 mA
High		20.5 mA	≥ 22.5 mA
Level	4–20 mA Saturation		4–20 mA Alarm
Low	3.7 mA — 3.9 mA		3.6 mA — 3.8 mA
High	20.1 mA — 21.5 mA		20.2 mA — 23.0 mA

Alarm and Saturation Level Configuration

Fast Keys 1, 4, 2, 7

Failure mode alarm and saturation levels can be configured using a HART Communicator or AMS, see “Alarm and Saturation Level Configuration” on page 3-12.Per Table 3-3,custom alarm and saturation levels can be configured between 3.6 mA and 3.9 mA for low values and between 20.1 mA and 23 mA for high values. The following limitations exist for custom levels:

•Low alarm level must be less than the low saturation level

•High alarm level must be higher than the high saturation level

•High saturation level must not exceed 21.5 mA

•Alarm and saturation levels must be separated by at least 0.1 mA

The HART Communicator or AMS will provide an error message if a configuration rule is violated.

To configure alarm and saturation levels with a HART Communicator or AMS perform the following procedure:

HART Communicator

1.From the HOME screen, follow the fast key sequence for “Alarm and Saturation Levels”.

2.Select 7, Config. Alarm Level to configure alarm levels.

3.Select OK after setting the control loop to manual.

4.Select OK to acknowledge current settings.

5.Select desired setting, if “OTHER” is selected enter HI and LO custom values.

6.Select OK to acknowledge the loop can be returned to automatic control.

7.Select 8, Config. Sat. Levels to configure saturation levels.

8.Repeat steps 3-6 to configure saturation levels.

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