Saab TankRadar Rex

Technical Description
22
Temperature measurement
Product temperature is an important parameter for
accurate custody transfer and inventory
measurement in liquid bulk storage tanks. High
quality Multiple Spot Thermometers (MST) can be
included in the Rex system delivery as an essential
part.
The Multiple Spot Thermometer (MST) measures
the temperature with a number of Pt 100 spot
elements placed at different heights to provide a
tank temperature profile and an average
temperature. Only the elements that are fully
immersed are used to determine the product
temperature. The spot elements are placed in a
flexible gas tight protection tube made from
convoluted stainless steel. A flange can be attached
to a top fitting and the tube can be anchored to the
bottom.
Multispot
Thermometer
RTG
Anchor weight or alternatively
a loop with steel wire pulled
through and to top of tank.
Up to 6 temperature elements can be connected directly to
the r adar gauge.
API chapter 7 recommends minimum one element
per 10 feet (3 m) tank height for custody transfer
applications.
The Multiple Spot Thermometer is easy to install,
even if the tank is in service. In pressurized tanks
the MST can be installed in a closed thermowell so
that it can be removed for service or inspection
while the tank is in operation. For LPG tanks single
spot temperatures sensors in thermowells are used.
Temperature sensors can be connected in two ways
to the RTG:
Directly into the RTG with common return
connection (up to six temperature elements)
Via the DAU (up to 14 temperature
elements)
A water bottom sensor can be integrated in the
MST, se page 34.
DAU
TankRadar L/2
Ex
DISPLAY
MODE
©
Multispot
Thermometer
RTG
Anchor weight or alternatively a
loop with steel wire pulled
through and to top of tank.
When the number of temperature elements is above 6 they are
connected via a Data Acquisition Unit. Maximum 14 temper ature
elements can be connected.