Introduction - Emerson Rosemount 5300 Manual Supplement

Manual Supplement
2

Introduction

The High Level Supervision (HLS) function in the Rosemount 5300 Level
Transmitter is used to monitor a high level alarm limit. A reference reflector
is mounted on the probe at the position of the alarm limit. The HLS function
is also included in several Proof tests for Safety Instrumented System (SIS)
applications.
The test function
A test function is available where the device will output the level
corresponding to the reference reflector echo. This test proves that the
device is properly monitoring the reference reflector echo and can be used
to test the high level alarm in the host system.
The test function is useful to verify several conditions:
• Output from device corresponds to alarm limit configured in the host
system.
• Primary Variable, Upper Range Value, and Lower Range Value have been
properly configured in the device by performing a two point verification
of the output. The test function enables test of the second point
(reference reflector) without raising level.
• Reference reflector is found at the calibrated distance
— Device is capable of performing a successful measurement.
— High Level Supervision function has been activated and properly
calibrated.
(The High Level Supervision Test function supplements the Loop Test
function. You may still use a Loop Test to set a fixed analog out current and
check loop between device and host system.)
Proof tests for Safety Instrumented System (SIS) applications
Regular proof testing is an essential requirement for SIS in liquid level
measurement applications, as it ensures that they are operating to the
necessary safety integrity level. The High Level Supervision test function can
be used for proof testing; see
For additional SIS and proof test information refer to the Rosemount 5300
Reference Manual
Continuous monitoring
In addition, the device continuously monitors the echo corresponding to the
reference reflector and evaluates its position. The echo will be affected when
the product surface level is above the alarm limit.
This information is used by the device to determine if the product surface
level is at or above the high level alarm limit. The device will output the level
4
Perform proof test for SIS
section: Safety Instrumented Systems.)
applications.
Rosemount 5300 Level Transmitter
April 2019