Oldham OLCT 200 User Manual page 22

OLCT 200 10-30VDC wireless Transmitters may accept electrochemical, catalytic
bead, PID, or IR sensors but wiring terminates differently for each. Electrochemical
sensor wiring connects to the back of the Display assembly as shown in Figure 2-6.
Catalytic Bead, PID, and IR sensor wiring connects to the I/O board as shown in Figure
2-7.
For OLCT wireless 10-30VDC powered models, connect 10-30 VDC between terminals
1 & 4 of TB2 (+ wire on 1 and 0V wire on 4) as shown in Figure 2-7. Wireless models
also transmit a sourcing 4-20mA output (electrochemical sensor output on TB2-2 and
bridge sensor outputs on TB2-3).
Instructions:
Unscrew the cover on the OLCT 200 explosion-proof enclosure. Loosen the 2
thumbscrews holding the display assembly and remove it. A small ribbon cable is
attached with sufficient length to allow access to the I/O PCB mounted in the bottom of
the enclosure (Figure 2-7). Power and signal connections are to TB2 where 24 VDC,
Signal and Common wires must be connected. A blocking diode protects the OLCT
200 if polarity of the power supply is reversed but it will not operate. Reassemble the
OLCT 200. Follow the procedures and recommendations in the receiver and power
supply manuals to complete the installation. Be sure the OLCT 200 enclosure and
conduit are properly grounded. Apply power and the OLCT 200 should function.
Proceed to section-3.
Figure 2-7: 10-0233 I/O Power Supply / 3-Wire 4-20mA Assembly
2.6.4.2 Antenna Transmission Range
The distance radio signals can travel is dependent upon several factors including
antenna design, transmitter power and Freespace losses. In order for a wireless link to
OLCT 200 User Manual | 22