Adtech TCT 326L Instruction Manual

1.0 INTRODUCTION
These instructions refer to the above model. Supplementary
sheets are attached if the unit has special options or features.
For detailed specifications, see page 4 or refer to the Data
Bulletin. All ADTE CH instruments are factory calibrated and
supplied with a label detailing the calibration. Adjustments
are normally not necessary. A simple calibration should be
performed to verify calibration before installation.
2.0 GENERAL DESCRIPTION
The ADTECH Model TCT 326L Low Power Isolated Three­
Wire Thermocouple Transmitter provides high accuracy
conversion of ISA type J, K, T, E, R, Sand B thermocouples
and mv to a standard 4-20 ma de process signal such as 1-
voe voe.
5 or 0-5
This model consumes very low power, typically 3.5 mA de
and is specially designed for remote battery or solar-panel­
powered applications.
The TCT 326L provides 600 volts ac or 1000 volts de
isolation from the input to output/power supply.
The primary features of the TCT 326L are:
• Low operating power, 3.5 mA typical.
• Wide range-covers the full range of ISA standard
thermocouples and mv.
• Field adjustable via plug in jumpers and potentiometers.
• Zero suppression of up to 100% of the major range with
a16 position switch.
• High accuracy, repeatability, and ambient temperature
effect stability.
• RFI Resistant.
• NO INTERACTION of zero and span controls.
• Small size-DIN mounting package provides. Only
1 "w x 3.1 "h X 3.6"d.
3.0 INSTALLATION
The instrument is supplied in a non-metallic general purpose
DIN rail mount enclosure as standard.
enclosures are optionally available. Installation area/loca­
tion must agree with the supplied instruments including
operating temperature and ambient conditions. For detailed
mounting and installation information refer to page 4 inside.
Electrical Connections
The wire used to connect the instrument to the control
system Input/ Output should be twisted pair(s) and sized
according to normal practice. Shielded cable is not normally
necessary (if used, the shield must be grounded at the
negative input of the ADTE CH instrument and left floating at
the sensor).
A six position compression terminal block is provided for the
1/0 and power connections. A housing ground terminal is not
TCT 326L
Three-Wire Isolated Thermocouple Transmitter
Instruction Manual
required due to non-metallic housing.
Controls
Instrument controls consist of the following:
The FINE ZERO and SPAN controls are accessible through
the front of the instrument.
4.0
These instruments are electronic and require no maintenance
except periodic cleaning and calibration verification. If the
unit appears to be mis-operating, it should be checked as
installed per section 6.0 or removed for a bench check per
sections 6.0 and 7.0. MOST problems are traced to field
wiring and / or associated circuits. If the problem appears to
be with the instrument, proceed to sections 6.0 and 7.0.
5.0
Standard connections are shown below and on the instrument
face plate, Data Bulletin or on attached supplementary
sheets.
4, 7 or 12
NEMA
NOTE 1: Terminal #3 should not have any customer
-1-
• Two 16 position switches for COARSE ZERO and
COARSE SPAN control.
• One 4 position jumper for selection of thermocouple
and major range.
• Two multiturn potentiometers; FINE ZERO and SPAN
controls.
• One 2-position jumper for 20 mv elevation.
• One 4-position jumper for TC-type.
MAINTENANCE
CONNECTIONS
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ADTECH
TCT326
REE WIRE
TRANSMTR
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connections.
190-A-000087