Rosemount 5300 Series High Transients and Emergency Shutdown (ESD) Installation Considerations Manuals & Guides

Manual Supplement

00809-1500-4530, Rev AA
April 2014

Rosemount® 5300 Series
High Transients and Emergency Shutdown (ESD)
Installation Considerations

Table of contents

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2

Installations with high transients for Ex “d” (Flameproof) units . . . . . . . . . . . . . . . . . . . . page 3

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3

Isolators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4

Alarm delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4

Installation and configuration considerations for ESD systems . . . . . . . . . . . . . . . . . . . . page 5

High-high unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

Low-low unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6

This document is a supplement to the Rosemount 5300 Series Reference Manual (Document No.
00809-0100-4530).

High Transients and ESD Installation Considerations

April 2014

1.1 Safety messages

Procedures and instructions in this section may require special precautions to ensure safety of
personnel performing the operations. Information that raises potential safety issues is indicated

by a warning symbol ( ). Refer to the following safety messages before performing an
operation preceded by this symbol.

Failure to follow these installation guidelines could result in death or serious injury.

Make sure only qualified personnel perform the installation.
Use the equipment only as specified in this manual. Failure to do so may impair the

protection provided by the equipment.

Explosions could result in death or serious injury.

Verify that the operating environment of the transmitter is consistent with the appropriate
hazardous locations certifications.

Before connecting a HART
the instruments in the loop are installed in accordance with intrinsically safe or
non-incendive field wiring practices.

Electrical shock could cause death or serious injury.

Use extreme caution when making contact with the leads and terminals.

®

-based communicator in an explosive atmosphere, make sure

Manual Supplement

00809-1500-4530, Rev AA

Any substitution of non-authorized parts or repair, other than exchanging the complete
transmitter head or probe assembly, may jeopardize safety and is prohibited.

Unauthorized changes to the product are strictly prohibited as they may unintentionally
and unpredictably alter performance and jeopardize safety. Unauthorized changes that
interfere with the integrity of the welds or flanges, such as making additional perforations,
compromise product integrity and safety. Equipment ratings and certifications are no
longer valid on any products that have been damaged or modified without the prior written
permission of Emerson Process Management. Any continued use of product that has been
damaged or modified without prior written authorization is at the customer's sole risk and
expense.

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High Transients and ESD Installation Considerations

Manual Supplement

Time, s

Current, mA

Low alarm = 10 s

Actual level value

High alarm = 10 s

00809-1500-4530, Rev AA

High Transients and ESD Installation Considerations

1.2 Installations with high transients for Ex “d” (Flameproof) units

In flameproof/explosion-proof installations, the energy barrier is built into the device, making
the device more sensitive to ground potential differences and sudden voltage drops (might
occur for example during lightning storms).

The function of the built-in barrier is to prevent excess energy from entering the device causing
a breach of certification and causing damage to the electronics. This leads to a temporary drop
in the voltage reaching the electronics and may cause a restart. More details on required power
supply can be found in section “Maximum loop resistance” of the Rosemount 5300 Series
Reference Manual (00809-0100-4530).

During start-up, the Rosemount 5300 by default outputs both low and high alarm for a short
period, as shown in Figure 1-1. If measurement alarm has been set to low alarm, the high alarm
period is removed and the low alarm period is stretched out for a total of 20 seconds.

Figure 1-1. Start-up sequence

April 2014

If this behavior will cause issues in an installation, there are several ways to mitigate it as
described in the following sections.

1.2.1 Grounding

Correct grounding will substantially reduce the effect caused by transients, but may not fully
resolve a recurring problem. Refer to “Step 3: Connect the wiring” of the Rosemount 5300
Series Quick Installation Guide (00825-0100-4530) for a detailed explanation on how to
properly ground the gauge.

High Transients and ESD Installation Considerations

3

High Transients and ESD Installation Considerations

Load resistance

Power
supply

Rosemount 5300 Series

Radar Transmitter

250 

Galvanic Isolator

April 2014

1.2.2 Isolators

Installing isolators will create a galvanic separation in the circuitry, shield the barrier from any
ground potential differences and make the installation much more robust.

Figure 1-2. Installation using external galvanic isolator

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00809-1500-4530, Rev AA

1.2.3 Alarm delay

If isolators cannot be used, an alarm delay will mask out any start-up alarms caused by
intermittent trips. A configured alarm delay must never be longer than your calculated process
safety time. For most installations the alarm delay should be set to a value that is slightly longer
than the entire start-up time.

4

High Transients and ESD Installation Considerations

Manual Supplement

High-high unit

Low-low unit

20 mA

4 mA

Warn ing

Shutdown

00809-1500-4530, Rev AA

High Transients and ESD Installation Considerations

April 2014

1.3 Installation and configuration considerations for ESD systems

Figure 1-3 shows a common example of an Emergency Shutdown (ESD) system in a separator.

High-high and low-low transmitters act as redundant safeguards. They will trigger emergency
shutdowns or redirect flow of the application. In addition, there are one or several process
control units that continuously measure and report the actual level in the tank to the host
system and operators.

The high-high unit will always be empty during normal operation, and will indicate empty in the
host system. The low-low unit will always be full during normal operation, and will indicate full in
the host system as well.

Figure 1-3. ESD system in a separator

1.3.1 High-high unit

The alarm levels must be located near the bottom inlet with considerable margin to the Blind
Zones to ensure robust and accurate readings. Guidelines in the Rosemount 5300 Series
Reference Manual (Document No. 00809-0100-4530) are to be closely followed regarding
alarm levels and handling disturbances in the near zone.

Figure 1-4. High-high unit

High Transients and ESD Installation Considerations

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High Transients and ESD Installation Considerations

UNZ = 14 in. (350 mm)

Minimum
20 in. (500 mm)

20 mA

4 mA

Warn ing

Shutdown

April 2014

1.3.2 Low-low unit

The distance from flange to upper inlet must be at least 20 in. (500 mm). If this requirement is
not met, a spool piece can be added. When the requirement of 20 in. (500 mm) is met, an Upper
Null Zone (UNZ) of 14 in. (350 mm) must be configured, so that any disturbance in the near
zone above the upper inlet is ignored.

Figure 1-5. Low-low unit

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High Transients and ESD Installation Considerations

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00809-1500-4530, Rev AA

High Transients and ESD Installation Considerations

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High Transients and ESD Installation Considerations

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00809-1500-4530, Rev AA

April 2014

Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.
All other marks are the property of their respective owners.

© 2014 Rosemount Inc. All rights reserved.

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