Chapter 2.
38
Model CTF878 Startup Guide
Figure 23: Totalizer/Frequency Outputs Wiring
2.1.14.4 Wiring an RTD Inputs Option Card
The CTF878 can accommodate up to four RTD (Resistance Temperature Device) inputs option cards. Each RTD inputs
option card provides two direct RTD inputs (designated as A and B).
Each RTD input requires three wires, which should be fed through one of the conduit holes on the bottom of the
electronic console. Wire this terminal block in accordance with the pin number assignments shown in Figure 25 on
2.1.14.5 Wiring a 0/4-20 mA Analog Outputs Option Card
The CTF878 flowmeter can accommodate up to 4 analog outputs option cards. Each analog outputs option card
includes four isolated 0/4-20 mA outputs (designated as A, B, C and D).
Connections to these outputs may be made with standard twisted-pair wiring. The total current loop impedance for
these circuits must not exceed 1,000 ohms. Wire this terminal block in accordance with the pin number assignments
shown in Figure 25 on page 40.
Once the CTF878 system is completely wired, proceed to Chapter 3,
Initial Setup, to configure the unit for operation.
Model CTF878
Totalizer Output
Pulse Counter
Max. Current: 4 Amps
Max. Voltage: 150 Volts
Isolation Voltage: 500 Volts
Max. Load Power: 1.0 Watt In
NO
C
C = Isolated Return
Volts +
(Int. Pwr Sup.)
Load
Volts –
(Common)
Frequency Counter
Model CTF878
NO
C
C = Isolated Return
Frequency Output
+5V
200
IN
Common
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