Endress+Hauser TH53, Техническая информация, Страница: 2 / 24

TH53, TH54 and TH55
2 Hauser
Function and system design
Measuring principle Thermocouples (TC)
Thermocouples are comparatively simple, robust temperature sensors which use the Seebeck effect
for temperature measurement: if two electrical conductors made of different materials are connected
at a point, a weak electrical voltage can be measured between the two open conductor ends if the
conductors are subjected to a thermal gradient. This voltage is called thermoelectric voltage or
electromotive force (emf.). Its magnitude depends on the type of conducting materials and the
temperature difference between the "measuring point" (the junction of the two conductors) and the
"cold junction" (the open conductor ends). Accordingly, thermocouples primarily only measure
differences in temperature. The absolute temperature at the measuring point can be determined
from these if the associated temperature at the cold junction is known or is measured separately and
compensated for. The material combinations and associated thermoelectric voltage/temperature
characteristics of the most common types of thermocouple are standardized in the IEC 60584 and
ASTM E230/ANSI MC96.1 standards.
Measuring system
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Hauser
RMS 621
On
∆p (Q)
T2
T1
Deltabar S
TMT162
TMT162
TH54
flanged thermowell
TH53
tilted,
threaded
thermowell
RMS621
Heat
exchange
process
A0027371-EN
 1 Application example
Calculation of heat quantity which is emitted or absorbed by a water flow in a heating or cooling
system. The quantity of heat is calculated from the process variable for Δp flow (Q) and the
differential from the feed and return temperature (T2 - T1). Bidirectional energy calculations, such
as the calculating systems with changing flow direction (charging/ discharging the heat
accumulator) are also possible.
Energy manager RMS621
Energy conservation and cost expenditures are significant issues in today's industry. Accurate flow monitoring
and calculation is the basis for thorough analysis and billing of energy. This data can serve as a basis to
maximize savings potential and help in controlling operational costs on a daily basis. Hauser's energy
managers provide accurate and reliable calculations for the monitoring and control of energy consumption
(both produced and consumed) according to international standards, e.g. IAPWS-IF 97, AGA8, ISO 5167 etc.
For RMS621 details, see "Documentation".
iTEMP TMT162 Temperature Field Transmitter
Aluminum or stainless steel dual compartment explosion - proof enclosure and compact, fully potted electronics
provide the ultimate protection in harshest environments. TMT162 prevents costly plant shutdowns by
detecting corrosion on RTDs or thermocouples before it corrupts the measured value. Hauser's Field
Temperature Transmitters with backlit display and sensor backup functionality are designed with safety in
mind to keep your plant, equipment and personnel safe. More information on this can be found in the Technical
Information, see "Documentation".