Wiring The Transducers; Wiring The 0/4-20 Ma Analog Outputs; Wiring The Serial Port - GE DigitalFlow DF868 Startup Manual

1.7.2 Wiring the Transducers

To meet CE Mark requirements, all cables must be installed as described in Appendix A,
Wiring a typical Model DF868 ultrasonic liquid flowmeter system requires interconnection of the following
components:
•
a pair of transducers (per channel) mounted in the flowcell
•
a lightning protector (optional)
•
the electronics console
To wire the transducers, complete the following steps:
WARNING! Before connecting the transducers, take them to a safe area and discharge any static buildup by
shorting the center conductor of the transducer cables to the metal shield on the cable
connector.
1. If an optional lightning protector is being installed, connect it to the electronics end of the cables according to the
instructions provided.
2. Locate the CH1 transducer cables and connect them to the two CH1 transducers.
3. Refer to the wiring diagram in Figure 10 on page 16 and connect the transducer cables to the CH1 terminal block.
Then, secure the cable clamp.
4. For a 2-channel Model DF868 flowmeter, repeat steps 2-3 to wire the Channel 2 transducer system to terminal
CH2
block .
Note: It is not required that Channel 2 of a 2-channel Model DF868 be used. This channel may be left inactive for
future use.
After the wiring has been completed, the transducer channel(s) must be activated before measurements can begin. See
Chapter 2, Initial Setup, for instructions.

1.7.3 Wiring the 0/4-20 mA Analog Outputs

The standard configuration of the Model DF868 flowmeter includes two isolated 0/4-20 mA analog outputs
(designated as A and B). Connections to these outputs may be made with standard twisted-pair wiring. The current loop
impedance for these circuits must not exceed 550 ohms.
Refer to Figure 10 on page 16 for the location of terminal block

1.7.4 Wiring the Serial Port

The Model DF868 is equipped with a built-in serial communications port. The standard port is an RS232 interface, but
an optional RS485 interface is available upon request. Proceed to the appropriate sub-section for wiring instructions.
For more information on serial communications, refer to the EIA-RS Serial Communications Manual (916-054).
DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Startup Guide (1- and 2-Channel)
!ATTENTION EUROPEAN CUSTOMERS!
CE Mark Compliance.
I/O
and wire the terminal block as shown.
Chapter 1. Installation
7