COMECO TRA1 User manual
Specifications
Input Signal
Output Signal
Output Linearity
ZERO Adjustment
SPAN Adjustment
Sensor Failure Reaction
Power Supply
Maximum Output Loop Load
Measurement Error
Self-heating Error
Temperature Drift
Operating Temperature / Humidity
Protection Class
T/C
4...20 mA, 2-wire
T/C voltage proportional
±50 °C ±10%
±10%
> 23 mA
8…32 VDC
800 Ωat 24V/20mA
0.3% from span
0.02%/mA at 24 V
0.02% from span for 1 °C
-30…80 °C / 0…95% RH, non-condensing
IP20
Warranty and Support
………………………….
serial number
………………………….
manufacturing date
QC check mark …….……(passed)
(stamp)
88 Slavyanska Str.
P.O.Box 378
Plovdiv 4000, BULGARIA
tel: +359 32 646523, 646524
fax: +359 32 634089, 646517
e-mail: support@comeco.org
QD-8.2.4-WC
Warranty
COMECO warrants this product
to be free from defects in materials
and workmanship for 2 years. If your unit
is found to be defective within that time,
we will promptly repair or replace it.
This warranty does not cover accidental
damage, wear or tear, or consequential
or incidental loss. This warranty
does not cover any defects caused
by wrong transportation, storage, installation,
or operating (see 'Specifications').
Technical support
In the unlikely event that you encounter
a problem with your COMECO device,
please call your local dealer or contact
directly our support team.
COMECO Inc., P.O.Box 378, Plovdiv 4000, BULGARIA, tel: +359 32 646523, 646524, fax: 634089
TRA1
for in-head mounting
OPERATION MANUAL
Please read this Operation Manual before mounting and operating!
Save the Manual for future references!
T/C TRANSMITTER
WITH SELECTABLE RANGES
v9-11.11
Overview
The T/C transmitter TRA accepts input
signals from various thermocouple types.
It allows on-site selection of both
the T/C type and the input range and
converts the input into standard 2-wire
4…20 mA signal, proportional
to the thermocouple output voltage,
that can be safely sent over long distances
to remote indicators, data loggers,
or controllers.
Mounting and Wiring
Important note:
Always use
the protective cover
to prevent the electronics
from getting dirt
on the soldering pads
as well as getting
electrostatic discharge
by accidental touch.
Mounting
♦TRA for in-head mounting is designed
to be incorporated inside protective heads
with 33 mm distance between centers
of the female threaded openings.
♦Install the transmitter into the temperature
probe head using two M4 screws with
appropriate length. To ensure vibration
proof, use special screws with springs.
♦Your TRA can also be easily mounted
on every 35 mm rail conforming
to EN50022 by the means of a special
snap-on accessory, offered separately.
Wiring
♦Connect the T/C sensor wires
to the transmitter input
via terminals 1(+) and 2(-),
as illustrated on the wiring diagram.
♦Wire the output current loop
through terminals 4(+) and 5(-).
♦In order to minimize measuring errors,
make sure the connecting screws
are tightened enough.
Configuring and Calibrating
Configuration
To be carried out
before calibration!
♦Open the plastic cap to expose
the five soldering jumpers,
each of which consisting
of 3 solder pads.
♦Set the desired T/C type
and input range by soldering
the respective jumper pads
according to the charts.
♦Put the plastic cover on.
Calibration
It is suggested that
the calibration be checked
at least once a year.
♦Connect the transmitter
(see 'Wiring').
♦Apply an input signal to give
an output of approximately 12 mA
and leave the unit for 15 min,
if possible at the ambient
temperature it is intended
to work at.
♦Apply INmin corresponding
to the desired minimum
input signal.
♦Adjust 'Z' potentiometer
to get Iout = 4.00 mA.
♦Apply INmax corresponding
to the desired maximum
input signal.
♦Adjust 'S' potentiometer
to get Iout = 20.00 mA.
♦Repeat the last 4 steps
until readings converge.
♦Secure the potentiometers
with lacquer.
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