This section contains details and further information which needs
to be taken into consideration when installing a Rosemount SAM42
Acoustic Particle Monitor.
7.2 Engineering units
The Rosemount SAM 42 Acoustic Particle Monitor supports only
engineering units according to the International System of Units (SI).
The following engineering units are used during configuration and
commissioning:
Variable Symbol Unit
Sand intensity µV Microvolts
Sand rate g/s Grams per second
Sand quantification g Grams
Flow velocity m/s Meters per second
Temperature °C Degrees Celsius
Power supply Vdc DC voltage
7.3 Process data
Calculating the sand rate requires information/ input about the flow
velocity.
Velocity input
The velocity must be measured/computed externally and then
supplied directly in m/s. This is mapped directly from the DCS/PCS
according to the table in Modbus map.
The more accurate the velocity input is, the more accurate sand rate
calculation is achieved by the SAM42 device.
Velocity input can be fed continuously from DCS to capture
fluctuating velocity.
7.4
Device functional testing
Having ensured that wiring is correct and safe, power may be
switched on and functional testing of the installation can be carried
out.
Power up the system. Indication of communication with the detector
on the pipe should be visible in the SAM42 Commissioning app.
Using a PC running the Rosemount SAM42 Commissioning app
attached to the RS485 port, a sensitivity test should be carried out
Quick Start Guide May2024
68 Emerson.com/Rosemount
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