Thermatel
®
Enhanced Model TA2
Thermal Mass Flow Meter
D E S C R I P T I O N
The Thermatel
®
Enhanced Model TA2 Thermal Mass Flow
Meter provides reliable mass measurement for air and gas
flow applications. The powerful, yet easy to use, electronics
are contained in a compact explosion proof enclosure.
The TA2 is available with both insertion probes as well as
flow body design for smaller pipe sizes. The TA2 offers
excellent performance at an exceptional value.
T E C H N O L O G Y
F E A T U R E S
•
Direct mass flow measurement of air and gases
•
High turndown ratios
•
Excellent low flow sensitivity
•
Low pressure drop
•
NIST traceable calibrations
SA
F
ET
Y
I
NT
EGRITY
P R O B E
F E A T U R E S
•
All 316 welded stainless steel and Hastelloy
®
C-276
construction
•
Selection of process connections, including threads,
welded flange construction, and use with a
compression fitting
•
Process temperatures up to +400° F (+200° C)
•
Pressure rating to 1500 psig (103 bar) dependent
upon process connections
•
Probe can be field-replaced
E L E C T R O N I C S
F E A T U R E S
•
Compact explosion proof/NEMA 4X enclosure, mounted
either integrally on the probe or at a remote location
•
Accepts all input power—11.6 to 30 VDC and 100 to
264 VAC
•
4 –20 mA flow signal can be set for either active or
passive operation
•
Optional pulse output plus second mA output which
can be used for temperature or different flow range
(mA output passive connection only)
•
HART communications with AMS and DTMs available
•
2-line
×
16-character backlit display with four push-
buttons for ease of configuration
•
Rotatable housing
•
Unique sensor design permits higher mass flow rates
yet maintains equivalent thermal mass for varying
temperature operation
•
Optional hot tap retractable probe assembly
A P P L I C A T I O N S
•
Combustion air
•
Compressed air
•
Digester/Bio-gas
•
Vent lines/Flare headers
•
Hydrogen lines
•
Calibration for two different gases
•
Natural gas
•
Language selections of English, German, French,
Spanish, and Russian
•
Aeration air
V
EL
LE
F L O W
B O D Y
F E A T U R E S
•
1
⁄
2
" to 4" pipe sizes
•
NPT threads available up to 2" in size
•
Stainless steel and carbon steel (with stainless steel sensor) construction
•
Flange connections for all sizes
•
Optional stainless steel flow conditioning plate for 1.5" and higher
•
Flow conditioning for
1
⁄
2
" to 1" based on upstream length and sensor design
A D D I T I O N A L
TOTALIZER
F E A T U R E S
LOW VOLTAGE OPERATION
The TA2 will accept input power as low as
11.6 VDC on Explosion Proof units when used
with Integral Electronics.
SELECTABLE STP
CONDITIONS
The TA2 directly measures mass flow of the gas
referenced to Standard Temperature and Pressure
(STP) conditions. Software permits the user to
change STP conditions for their own requirements.
AREA COMPENSATION
FOR PIPE SIZE
The TA2 automatically compensates the flow mea-
surement based on actual area of the pipe. The
user simply enters the size or the area of the new
pipe, and the instrument automatically calculates
the flow including factors for the probe blockage.
HART
COMMUNICATION
Two 7-digit flow totalizers, one resettable and one
non-resettable are provided. Flow units selectable
in user’s choice of engineering units. Totalizer data
is electronically stored eliminating the need for
backup batteries and provides maximum safeguard
data in the event of a power interruption. The total-
izer can be reset using the display module, HART
or via PACTware
™
.
TEMPERATURE
COMPENSATION
Thermal flow technology measures the mass flow
rate without the need for pressure and temperature
correction as required with most gas flow instru-
ments that measure the flow rate at actual condi-
tions. However, changing temperature will change
the properties of the gas which effect convective
heat transfer. The Model TA2 measures the gas
temperature and automatically adjusts the mass
flow measurement for changes in gas properties
over the entire temperature range of the instrument.
DIAGNOSTICS
Diagnostics is an important aspect of the TA2.
The Enhanced TA2 has additional diagnostics to
check the operation and performance of the unit.
Diagnostics includes probe status, a test of RTD drift
with automatic recalibration, and overall performance.
In order to verify that the calibration and configura-
tion match the original calibration conditions, the
user can select a specific signal and compare the
TA2 display value against the original calibration
certificate.
2
Using HART/AMS communication, the user can
configure the instrument from a remote location.
HART provides the same functionality as the display
module interface including all configuration and
diagnostic information.
AIR
EQUIVALENCY
Using historic air-gas calibration data, an air equiva-
lency calibration can be performed on select gases.
Consult Magnetrol
®
for details and flow ranges.
A D D I T I O N A L
PROBE
F E A T U R E S
c o n t i n u e d
NAMUR
COMPLIANCE
INSTALLATION
Probes can be provided with a variety of process
connections, including threads, flanges, or installation
through a compression fitting. The sensor will fit
pipe sizes of 1
1
⁄
2
" diameter or larger (2" minimum
size with thread connection).
The sensor is protected to prevent damage due to
“bottoming-out” if inserted too far into a pipe.
PULSE
OUTPUT
Model TA2 output signal meets NAMUR NE43 rec-
ommendations for the 4–20 mA signal levels.
FACTORY
CALIBRATION AND
CONFIGURATION
Each TA2 is calibrated at the factory for the type of
gas and the specified flow rate. The instrument is
configured for the specific application information.
The result is an instrument which can be installed
and immediately be placed into operation without
field setup.
CALIBRATION
VERIFICATION
MAGNETROL has developed a procedure to verify
the calibration of the TA2 in the field. Following
this procedure, the user can verify that the heat
transfer characteristics of the instrument have not
changed from first received. While the calibration is
a permanent calibration, the user can now check
the calibration without having to return the instru-
ment to the manufacturer. When using a HART
handheld or PACTware
™
, the user is guided through
the procedure.
ELECTRICAL
WIRING
The optional pulse output provides a pulse output
equivalent to user selected units and multiplier factor.
Both active (power from the TA2) or passive
(external power supply) connections are provided
to match the user’s interface. This output can
optionally be used as an alarm to indicate that the
flow rate is above or below the desired set point.
PORTABLE
MODULE
DISPLAY
A portable display module for configuration and
diagnosis of multiple units is available (part number
089-5219-002). This portable module plugs into the
electronics in the same manner as the normal display
and uses the same software menu. This module
permits the user to reduce installation cost by
having one display module with keypad for
multiple TA2 units.
Usage of the display module requires that the housing
cover be removed during use and thus may not be
useable in hazardous areas. In these cases, the
HART option should be utilized.
Elevated terminal strips with very visible markings
make wiring of the TA2 extremely easy.
Portable Display Module
3
PACTware
™
P C
S O F T W A R E
The Most Efficient PC Configuration Tool
for TA2 Mass Flow Meters
PACTware
is the modern, user-friendly adjustment software that enables
quick configuration and diagnostics of your TA2 mass flow meters.
With your PC connected through a serial interface to the HART loop,
all functionality can be managed remotely anywhere on the loop.
Parameters Screen
Every Parameter in the TA2 can be
reviewed and monitored remotely with a few clicks of
the mouse. From units of measurement to pipe size, I/O
Configuration or Calibration Factors, the parameters can
be viewed or changed.
Trending Screen
Trending is available of the flow rate,
temperature, and signal providing useful information on
the operation of the TA2. This is especially important
for troubleshooting and diagnostics if required.
Parameters Screen
Process Trend Screen
A P P L I C A T I O N S
COMPRESSED
AIR/GASES
Measurement of mass flow in different gas lines to
determine compressor efficiency or in plant usage for
internal allocation.
Advantages:
• direct mass flow
• high turndown rates
• flow totalization
• easy installation
BOILER
Natural Gas
COMBUSTION
The TA2 measures the inlet air flow to the boiler.
This signal is sent to the DCS where it is used to trim
the natural gas flow.
Advantages:
• mass flow measurement
• repeatable flow signal
• high rangeability
4
A P P L I C A T I O N S
NATURAL
GAS
FLOW
The Model TA2 efficiently measures the flow and
totalized flow of fuel to furnaces, heaters, or boilers.
This data may be used for internal allocation or to
report emission rates.
Advantages:
• direct mass flow in SCFM
• built-in totalizer
• ease in setup and operation
Natural gas
or propane
Air
FLARE
LINES
Measurement of flow in different sections of flare line.
Advantages:
• good low flow sensitivity
• high turndown
• easy removal if cleaning is required
AERATION
AIR
FLOW
Measurement and balance of the flow to each section
of the aeration basin in waste water treatment plants.
Advantages:
• low installation cost
• direct mass flow
• high reliability
DIGESTER
GAS/BIO-GAS
The off gas from a digester contains a mixture of methane and
carbon dioxide saturated with moisture. This is a difficult flow
measurement due to low flow rate and low pressures.
Advantages:
• excellent low flow sensitivity
• high turndown rates
• provides measurement of flow and totalized flow
To engine
or flare
5
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