TABLE OF CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Agency Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Model Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
DESCRIPTION
The Thermatel Mass Flow Transmitter Model TA1 provides
high performance measurement of the mass flow of air and
other gases. Using a heated sensor, the mass flow is deter-
mined by accurately measuring the temperature difference
between the heated sensor and the reference sensor. Heat
transfer is due to the mass of the gas flowing past the sen-
sor providing a measurement of the mass flow rate.
Thermatel
Mass Flow Transmitter
®
Model TA1
Instruction Manual and Parts List
The advanced microprocessor provides accurate tempera-
ture compensation as the process temperature changes.
Each instrument is factory calibrated in a NIST flow standard
to provide highest level of accuracy. The electronics permit
the user to configure the instrument for the pipe or duct size,
zero and span, units of measurement, alarms, and other user
specific requirements.
The instrument provides two 4-20 mA output signals; one for
flow measurement, and one for temperature. Each 4-20 sig-
nal can be configured from the instrument.
PRINCIPLE OF OPERATION
The flow element of the TA1 Mass Flow Transmitter
utilizes a heater and two resistant temperature detectors
(RTDs). The heater and the active RTD are contained in one
sensor; the second sensor contains the reference RTD and a
mass balancing element.
The reference RTD measures the temperature of the process
where the flow element is installed. A constant power is pro-
vided to the heated sensor. The active RTD measures the
temperature of the heated sensor. The electronics measures
the temperature difference between the active and reference
RTD.
PAGE
There is an inherent non-linear relationship between the tem-
perature difference and the mass flow rate. The micro-
processor-based electronics convert the temperature differ-
ence signal to provide a linear measurement of the mass flow
rate. The electronics also provide advanced temperature
compensation which automatically adjusts the flow meas-
urements for changes in process temperature.
The 4-20 mA output signal can be adjusted to provide max-
imum resolution of flow measurement over the desired range
of the instrument. A separate 4-20 mA signal provides an
output signal of the process temperature. Both 4-20 mA sig-
nals can be wired for either active or passive operation. Refer
to wiring section, pages 4 and 5.
Optional relays provide low or high flow alarm indication and
can be used for diagnostics.
UNPACKING
Unpack the instrument carefully, making sure all components
have been removed from the packing material. Inspect all
components for damage, and report any concealed damage
to the carrier within 24 hours. Check the contents of the car-
ton, making sure it agrees with the packing slip and the pur-
chase order. Verify that the model number imprinted on the
nameplate matches the number on the packing slip and the
purchase order. Report any discrepancies to the factory.
Check and record the serial number for future reference
when ordering parts.
®
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