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Chapter 2. Installation
10 TMO2D User’s Manual
2.3.3 TMO2-TC Transmitter
Connecting the TMO2-TC thermal conductivity transmitter to the TMO2D requires use of the X3(*) or Y3(*) cables. The
X3(*) cable can be used for distances up to 450 ft (130 m). For longer distances, each cable can be supplied as
18-AWG that can be located up to 1,050 ft (320 m). If you are using your own cable, refer to Table 5 below for cable
requirements.
For longer cable lengths, consult the factory.
2.3.3.1 Wiring:
Use the following steps to interconnect the TMO2-TC to the TMO2D.
1. Route the cable into the TMO2-TC transmitter through one of the 3/4" conduit holes on the side of the transmitter.
WARNING!
Be sure to plug the unused conduit/cable entry hole on the transmitter, in order to meet
specifications and to maintain the appropriate weatherproof or explosion-proof rating.
2. Unplug TB1 on the TMO2-TC transmitter PC board (PCB) by carefully pulling it directly up without bending the pins
attached to the PCB. See Figure 6 on page 11.
3. Loosen the TB1 side screws and insert the colored wires into the corresponding openings on top of TB1. Refer to
Table 6 below for color-coded pin designations.
WARNING!
Make sure that the +24 VDC wire (red) is connected to terminal TB1-1. Conn24 VDC to any
other terminal could cause bodily harm. It could also cause damage to the TMO2-TC PCB, requiring
factory repair.
4. Tighten the side screws, and carefully plug TB1 onto the PCB.
5. Connect the other end of the cable in a similar manner to the TMO2D. Refer to Figure on page 17 for TB1 location.
Table 5: Cable Requirements for TMO2-TC
MAX. CABLE LENGTH CABLE SIZE
Feet Meters AWG Sq. mm
450 130 22 0.35
700 200 20 0.6
1,050 320 18 1.0
1,700 500 16 1.2
2,800 850 14 2.0
4,000 1,200 12 3.0
Table 6: Wiring the TMO2-TC with 3-Wire Cable
Wire
Connections Color
TMO2-TC
Transmitter
TB1
TMO2D
Display
TB5
Power +24 VDC Red Pin 1 +24 V
Power Return Black Pin 2 RTN
+mA Signal White Pin 3 GAS
No Connection