O p e r a t i o n s a n d I n s t r u c t i o n M a n u a l
27
S A G E M E T E R I N G , I N C .
REV. 03-SIE/SRE
Sage Thermal Mass Flow Meters have two sensors
constructed of reference grade platinum windings
(RTDs). The two RTDs are clad in a protective 316SS
sheath and are driven by a proprietary sensor drive
circuit. One of the sensors is self-heated (flow sen-
sor), and the other sensor (temperature/reference
sensor) measures the gas temperature. The pair is
referred to as the sensing element, and is either in -
stalled in a probe as an Insertion style, or in serted
into a pipe section as an In-Line style flow meter.
As gas flows by the flow sensor, the gas molecules
carry heat away from the sur face, and the sensor
cools down as it loses energy. The sensor drive
circuit replenishes the lost energy by heating the
flow sensor until it is a constant temperature dif -
ferential above the reference sensor. The electrical
power required to maintain a constant temperature
Principle of Operation of the Thermal Mass Flow Meter
differential is directly proportional to the gas mass
flow rate and is linearized to be the output signal
of the meter.
It is essential that this constant temper ature differen-
tial be maintained, even if there are wide fluc tuations
in gas temperature. It is the “job” of the Sage propri-
etary sensor drive circuit to maintain the differential,
whether or not the gas temperature changes, or how-
ever quickly molecules cool off the flow sensor. It is
also necessary to properly calibrate the device with
the actual gas (or close equivalent with certain
gases), in the Sage National Institute of Standards
certified (NIST) calibration facility. By ac complishing
these two critical objectives, the Sage meters provide
an extremely repeatable (0.2% of full scale) and accu-
rate output directly proportional to the mass flow
rate of the gas being measured.
INTEGRAL EXPLOSION PROOF
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REMOTE EXPLOSION PROOF
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SIE-XXX
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BASIC HEAVY INDUSTRIAL SAGE FLOW METER STYLES
Содержание SIE Series
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