Rosemount 2240S, Reference Manual

Page: 22 / 100

Reference Manual
300550EN, Rev AA
December 2010
Rosemount 2240S
3-4
Section 3. MST/WLS Installation
3.3 MULTIPLE SPOT
TEMPERATURE
SENSOR
The Multiple Spot Temperature sensor (MST) measures the temperature with
a number of Pt 100 elements placed at different heights to provide a
temperature profile and average temperature of the product. The spot
elements are placed in a flexible gas tight tube made of stainless steel which
can be anchored to the tank bottom, see “Installing a Temperature Sensor
Tube” on page 3-8.
Up to 16 Pt100 temperature elements can be connected to a Rosemount
2240S Multi-input Temperature Transmitter.
3.3.1 Installation on
Fixed Roof Tanks
On fixed roof tanks the MST is attached to a flange mounted on a suitable
nozzle.
Figure 3-1. Installation of
multiple spot temperature
elements on fixed roof tanks
Maximum level
0.5-1 m
(1.6-3.2 ft)
0.5-1 m
(1.6-3.2 ft)
Upper spot
element
First spot
element
2.5-15 kg
(5.5-33 lbs)
85-330 mm
(33-130 in.)
Anchor weight