Wiring
Even though the TDX6 is a six-channel temperature monitor, it will
monitor and display from 1 to 6 thermocouples with equal results.
When monitoring less than six temperature channels, always jumper
the unused thermocouple terminals on the back of the TDX6 with the
factory-installed jumper provided. The unused channel will display
approximate ambient temperature.
1. Connect the thermocouple leads to the thermocouples. (See
Using Thermocouple Extension Wire for details if extension wire
is needed.) NOTE: Attach wire markers to each thermocouple
lead identifying polarity and thermocouple number.
2. Remove factory-installed jumper on the TDX6 for each
thermocouple to be installed.
3. Connect positive lead of thermocouple TCl to the positive (+)
terminal of terminal strip TCI (see wiring diagram below).
4. Connect negative lead of thermocouple TCI to the negative (-)
terminal of terminal strip TCl.
5. Repeat steps 2 thru 4 with each thermocouple to be monitored.
If the thermocouple leads are not long enough, you will need
to use thermocouple extension wire. Thermocouple exten-
sion wire must be of the same material as the thermocouple
lead wires (see chart). Metallic-shielded thermocouple wire
is recommended. It provides electrical shielding as well as
protection against wear and abrasion.
CAUTION: The use of non-thermocouple wire will cause inaccurate temperature sensing and erratic operation. KEEP ALL HIGH VOLTAGE WIRING
SUCH AS SPARK PLUG OR IGNITION WIRES AWAY FROM THERMOCOUPLES AND EXTENSION WIRING.
Using Thermocouple Extension Wire
Thermocouple Extension Wire Color Code Chart
Thermocouple Wire Color Code / Material
Type P/N Extension P/N Positive Lead Negative Lead
J (I 0-00-0526) Jx (00-00-3271) White/Iron Red/Constantan
K (I 0-00-0527) Kx (00-00-3272) Yellow/Chromel Red/Alumel
To prevent problems of interference from electrical noise, DO NOT route thermocouple wires in the same conduit or within 12 in. (305 mm) of
ignition wires or alternating current conductors. When connecting the thermocouple leads, twist the wire connections, then install wire nuts,
such as ceramic, which have no metal insert.
Operation Test
Connecting Power Wires
1. Be sure power is OFF.
2. Connect the power input leads to the small terminal block locat-
ed on back of the TDX6. (TDX6 connections have no polarity.)
Perform the Operation Test after the TDX6 is installed and wired
appropriately.
1. Slowly rotate each trip point potentiometer clockwise until
detent is felt.
2. Apply power to the monitor.
3. Verify that the TRIP POINT READ knob is in the SCAN mode.
The left side of the display will show the thermocouple number.
The right side of the display will show the temperature of that
thermocouple.
NOTE: When the TRIP POINT READ knob is in the SCAN mode, depressing the
THERMOCOUPLE READ push button will stop the scan sequence at the next chan-
nel and display the thermocouple number and its reading. Scanning will resume
approximately 3 seconds after the push button is released. With TRIP POINT READ
knob selecting a number, the push button should not be depressed.
4. Set the TRIP POINT READ knob to the number 1 setting. On
the right side of the display window, you will see the trip point
reading of the TCI thermocouple. The left side of the display will
continue to scroll 1 to 6 indicating that the unit is still scanning
all channels.
5. Rotate the TPl trip point potentiometer counterclockwise until
trip point TPl turns on and trips the shutdown device or alarm.
Verify by observation.
6. Rotate the trip point potentiometer TPl clockwise several turns
to tum off TPl.
7. Reset alarm or shutoff device.
8. Set TRIP POINT READ knob to the TP2 position to display the
TP2 temperature trip point.
9. Repeat steps 4 thru 7 with each thermocouple to be tested.
Grounded or Ungrounded Thermocouples
1. Apply power to the temperature monitor.
2. Set TRIP POINT READ knob to the 1 position.
3. Rotate the trip point adjustment potentiometer TPI until the dis-
play indicates the desired trip point temperature for TPl.
4. Repeat steps 2 and 3 for each thermocouple to be set. Turn
TRIP POINT READ knob to SCAN position to resume operations.
Trip Point Adjustment
NOTE: We prefer ungrounded thermocouples. Using grounded thermocouples
introduces the risk of odd currents or voltages being imposed on the thermocouple
signal which can affect the accuracy of the reading.
