TCX 226
Two-Wire Isolated Thermocouple Transmitter
Instruction Manual
1.0 INTRODUCTION
These instructions refer to the above model. Supplementary
sheets are attached if the unit has special options orfeatures.
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 TCX 226 Isolated Two-Wire
Thermocouple Transmitter provides high accuracy con
version of ISA type J, K, T, E, R, Sand B thermocouples and
mv to a standard 4-20 ma de process signal.
The TCX 226 provides 600 volts ac or 1000 volts de isolation
from the input to output/power supply.
The primary features of the TCX 226 are:
• 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 1 00% 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.
• Options for NEMA 4 and NEMA 7 housings, SNAP
TRACK and surface mounting.
3.0 INSTALLATION
The instrument is supplied in a non-metallic general purpose
DIN rail mount enclosure as standard. NEMA 4, 7 or 12
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 AD TECH instrument and left floating at
the sensor).
A six
position compression terminal block is provided for the
1/0 and power connections. A housin
·
g ground terminal is not
required due to non-metallic housing.
Controls
Instrument controls consist of the following:
• Two 16 position switches for
COARSE
ZERO and
COARSE
SPAN control.
• One 4 position jumper for selection of major range.
• One 4-position jumper for TC-type.
• One 2-position jumper for 20 mv elevation.
• Two multiturn potentiometers;
FINE
ZERO and SPAN
controls.
The FINE ZERO and SPAN controls are accessible through
the front of the instrument.
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 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 CONNECTIONS
Standard connections are shown below and on the instrument
face plate, Data Bulletin or on attached supplementary
sheets.
ADTECH
TCX226
TWO WIRE
TRANSMTR
OUTPVT
LOOPSU'!'\.Y
-1-
(9/96) 190-A-000077-A
