GE DigitalFlow GF868, Startup Manual

Page: 18 / 80

Chapter 1. Installation
8 DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
1.7.2 Wiring the Transducers
Wiring the GF868 ultrasonic flare gas flowmeter system requires interconnection of the following components:
•
a pair of transducers mounted in the flowcell
•
a preamplifier for each channel
•
an optional lightning protector
•
the GF868 console.
Use a coaxial cable to make all connections between the console and the transducers. Connect the transducers to
terminal block CH1 as shown in Figure 9 on page 18 and Figure 10 on page 19.
1.7.3 Wiring the 0/4-20 mA Analog Outputs
The standard GF868 comes with two isolated 0/4-20 mA analog outputs (A and B). Use standard twisted-pair wiring to
make connections to these outputs. The current loop impedance must not exceed 550 ohms.
Refer to Figure 9 on page 18 and connect the wires to the terminal block I/O as shown.
1.7.4 Wiring the Serial Port
The Model GF868 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).
ATTENTION EUROPEAN CUSTOMERS!
In order to meet CE Mark requirements, all wiring connections must be made in accordance with
the instructions in Appendix A,
CE Mark Compliance.
WARNING! Before connecting the transducers, discharge any static buildup in a safe area, by
shorting the center conductor of the transducer cables to the metal shield of the
cable connector.