1
(2/ 0) 190-A-000098 Rev. A
3750 Monroe Avenue
Pittsford, New York 14534-1302
(716) 383-8280
FAX (716) 383-
8386
TCT-327 Smart Touch
3-Wire
Isolated Temperature Transmitter
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 ADTECH instruments are factory calibrated and
supplied with a label detailing the calibration. Adjustments
are normally not necessary. A simple check must be
performed to verify calibration before installation to ensure
that it matches the field requirement.
2.0 GENERAL DESCRIPTION
The TCT-327 transmitter accepts any of the 11 standard
thermocouple input types and provides a linearized and
isolated output representing temperature. Calibration is
extremely easy with Adtech’s Smart Touch
technology.
Simply input your zero value, touch a button, input your full-
scale value and touch another button, and the unit is
calibrated.
The isolated output resolution is 12 bits and provides
standard voltage or current output signals (see table 1 page
3). Isolation is 600 volts ac or 1000 volts dc from the input to
the output / power supply. Power requirement is 15 to 42 Vdc
at 40 ma maximum.
The primary features are:
Wide range - covers the full usable range of 11 NIST
standard thermocouple types.
Output setup is via plug in jumpers.
High accuracy, input resolution to 0.3
v.
Update rate of 20Hz, -3db response of 5.24 Hz (0.067
msec) standard. Consult factory for conversion rates to
500 Hz.
RFI resistant.
No interaction of ZERO and SPAN controls.
Adtech Smart Touch
calibration.
Small size
DIN mounting package (1"w x 3.1"h x
3.6"d).
Options for NEMA 4 and NEMA 7 housings, SNAP
TRAK and surface mounting.
3.0 INSTALLATION
Electrical Connections
The wire used to connect the instrument to the control system
I/O should be a twisted pair(s) and sized according to normal
practice. Shielded cable is not normally necessary (if used,
the shield must be grounded at the input negative of the
ADTECH instrument and left floating at the sensor).
Six position compression terminal blocks are provided for I/O
and power connection. A housing ground terminal is not
required due to non-metallic housing.
Controls
Instrument controls consist of the following:
8 position switch for input configuration and calibration
options.
Input ZERO and SPAN push buttons (Adtech Smart
Touch
)
Jumper for zero based / elevated output.
Output ZERO and SPAN pots.
4.0 MAINTENANCE
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 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 CONNECTIONS
Standard connections are shown below and on the
instrument face plate, Data Bulletin or on attached
supplementary sheets.