GE DigitalFlow GF868 User guide

GE
Measurement & Control Gas Analysis
910-194U Rev. F
February 2015
DigitalFlow™ GF868
Ultrasonic Flowmeter for Flare Gas
Startup Guide (1 and 2-Channel)

www.ge-mcs.com
©2015 General Electric Company. All rights reserved.
Technical content subject to change without notice.
DigitalFlow™ GF868
Ultrasonic Flowmeter for Flare Gas
Startup Guide (1 and 2-Channel)
910-194U Rev. F
February 2015

ii
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DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) iii
Preface
Information Paragraphs
Note: These paragraphs provide information that provides a deeper understanding of the situation, but is not
essential to the proper completion of the instructions.
IMPORTANT: These paragraphs provide information emphasizing instructions which are essential to proper setup of
the equipment. Failure to follow these instructions carefully may cause unreliable performance.
Safety Issues
Auxiliary Equipment
Local Safety Standards
The user must make sure that he operates all auxiliary equipment in accordance with local codes, standards,
regulations, or laws applicable to safety.
Working Area
WARNING! Indicates a potentially hazardous situation which can result in serious personal
injury or death, if it is not avoided.
CAUTION! Indicates a potentially hazardous situation which can result in minor or moderate
injury to personnel or damage to the equipment, if it is not avoided.
HIGH VOLTAGE! This symbol indicates the presence of high voltage. It calls your attention to
situations or operations that could be dangerous to you and other persons operating the
equipment. Read these messages and follow the instructions carefully.
WARNING! It is the responsibility of the user to make sure all local, county, state and national
codes, regulations, rules and laws related to safety and safe operating conditions are met for
each installation.
WARNING! Auxiliary equipment may have both manual and automatic modes of operation. As
equipment can move suddenly and without warning, do not enter the work cell of this equipment
during automatic operation, and do not enter the work envelope of this equipment during
manual operation. If you do, serious injury can result.
WARNING! Make sure that power to the auxiliary equipment is turned OFF and locked out
before you perform maintenance procedures on the equipment.

Preface
iv DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
Qualification of Personnel
Make sure that all personnel have manufacturer-approved training applicable to the auxiliary equipment.
Personal Safety Equipment
Make sure that operators and maintenance personnel have all safety equipment applicable to the auxiliary equipment.
Examples include safety glasses, protective headgear, safety shoes, etc.
Unauthorized Operation
Make sure that unauthorized personnel cannot gain access to the operation of the equipment.
Environmental Compliance
Waste Electrical and Electronic Equipment (WEEE) Directive
GE Measurement & Control is an active participant in Europe’s Waste Electrical and Electronic Equipment (WEEE)
take-back initiative, directive 2012/19/EU.
The equipment that you bought has required the extraction and use of natural resources for its production. It may
contain hazardous substances that could impact health and the environment.
In order to avoid the dissemination of those substances in our environment and to diminish the pressure on the natural
resources, we encourage you to use the appropriate take-back systems. Those systems will reuse or recycle most of the
materials of your end life equipment in a sound way.
The crossed-out wheeled bin symbol invites you to use those systems.
If you need more information on the collection, reuse and recycling systems, please contact your local or regional
waste administration.
Visit http://www.ge-mcs.com/en/about-us/environmental-health-and-safety/weee.html for take-back instructions and
more information about this initiative.

DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) v
Contents
Chapter 1. Installation
1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.3 Site Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.3.1 Electronics Console Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.3.2 Flowcell Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.3.3 Transducer Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.3.4 Cable Lengths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.3.5 Temperature and Pressure Transmitters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.3.6 Transducer Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.4 Installing a Flowcell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.5 Installing Temperature and Pressure Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.6 Mounting the GF868 Enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.7 Making Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.7.1 Wiring the Line Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.7.2 Wiring the Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.7.3 Wiring the 0/4-20 mA Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.7.4 Wiring the Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.7.5 Wiring an Alarms Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.7.6 Wiring a 0/4-20 mA Analog Inputs Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.7.7 Wiring the Totalizer/ Frequency Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.7.8 Wiring the RTD Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Contents
vi DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
Chapter 2. Initial Setup
2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
2.2 Navigating Through the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
2.3 Accessing the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
2.3.1 1-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
2.3.2 2-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
2.4 Activating a Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
2.4.1 1-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
2.4.2 2-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
2.4.3 1 and 2-Channel Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
2.5 Entering System Data for a Channel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.5.1 A 1-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.5.2 A 2-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
2.5.3 1 and 2-Channel Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
2.6 Entering Pipe Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
2.6.1 Transducer Number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
2.6.2 Pipe OD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
2.6.3 Pipe Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
2.6.4 Path Length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
2.6.5 Axial Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
2.6.6 Reynolds Correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Chapter 3. Operation
3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
3.2 Powering Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.3 Using the Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
3.4 Taking Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
3.4.1 Foundation Fieldbus Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) vii
Contents
Chapter 4. Specifications
4.1 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.1.1 Hardware Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.1.2 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.1.3 Flow Accuracy (% of Reading) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.1.4 Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.1.5 Molecular Weight and Mass Flow Accuracy (% of Reading) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.1.6 Rangeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.1.7 Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.1 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.2 Power Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.3 Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.4 European Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.2.5 Input/Output Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.3 Operational Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.3.1 Flow Computer (Built-in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.3.2 Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.3.3 Display Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.3.4 Printer Signal Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.4 Transducer/Flowcell Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.4.1 Transducer Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.4.2 Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.4.3 Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.4.4 Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.4.5 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.4.6 Mounting and Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.5 Flowcell Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.5.1 Spoolpiece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.5.2 Hot/Cold Tap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.5.3 Preamplifier with Explosion-proof Housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Appendix A. CE Mark Compliance
A.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A.3 External Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Appendix B. Data Records
B.1 Option Cards Installed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
B.2 Initial Setup Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Contents
viii DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
Appendix C. Optional Enclosures
C.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
C.2 Rack Mount Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
C.3 Rack Mount Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
C.4 Rack Mount Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Appendix D. Measuring P and L Dimensions
D.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
D.2 Measuring P and L Distances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
• Special Conditions for Safe Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) 1
Chapter 1. Installation
Chapter 1. Installation
1.1 Introduction
To ensure safe and reliable operation of the Model GF868 flowmeter for flare gas, the system must be installed in
accordance with the guidelines established by GE’s engineers. This section explains how to install the Model GF868
electronics console and make wiring connections. It covers:
•Unpacking - How to unpack the GF868 system.
•Selecting a suitable site for the electronics console and the flowcell/transducers.
•Installing a flowcell
•Installing temperature and pressure transmitters
•Installing the electronics console
•Wiring the electronics console
1.2 Unpacking
Remove the electronics console, transducers, and cables from the shipping containers. Check all packing material
before discarding it to account for all parts and documentation listed on the packing slip. If anything is missing or
damaged, contact the factory immediately for assistance.
WARNING! THE MODEL GF868 FLOWMETER MEASURES THE FLOW OF MANY GASES, SOME OF
THEM POTENTIALLY HAZARDOUS. WE CANNOT OVEREMPHASIZE THE IMPORTANCE
OF SAFETY. BE SURE TO FOLLOW ALL APPLICABLE SAFETY CODES AND
REGULATIONS FOR INSTALLING ELECTRICAL EQUIPMENT IN YOUR AREA AND WHEN
WORKING WITH PARTICULARLY HAZARDOUS GASES OR FLOW CONDITIONS.
CONSULT YOUR COMPANY SAFETY PERSONNEL OR LOCAL SAFETY AUTHORITIES IF
YOU ARE UNSURE ABOUT THE SAFETY OF ANY PROCEDURE OR PRACTICE.
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.

Chapter 1. Installation
2DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
1.3 Site Considerations
Since the relative physical locations of the flowcell(s) and the GF868 electronics are important, use the guidelines
given in this section when planning your GF868 system installation.
1.3.1 Electronics Console Location
Normally, the GF868 electronics enclosure is a Type-4X weather-resistant, dust-tight, indoor/outdoor type. (Other
enclosure options are described in Appendix C.) Typically, the electronics console is mounted in a meter shed. If it is
not, select a location that allows you access to your meter for programming, testing, and servicing.
Note: For compliance with the European Union’s Low Voltage Directive, this unit requires an external power
disconnect device such as a switch or circuit breaker. The disconnect device must be marked as such, clearly
visible, directly accessible, and located within 6 ft (1.8 m) of the GF868.
1.3.2 Flowcell Location
The pipeline flowcell consists of the flowmeter transducers and any pressure and temperature transducers that may be
used as part of the flowmeter system. Ideally, the section of pipe chosen as the flowcell should be a pipe section with
easy access; for example, a long stretch of pipe that is above ground. However, if the flowcell must be on an
underground pipe, dig a pit around the pipe to facilitate the transducer mechanisms.
1.3.3 Transducer Locations
For a given gas and pipe, the Model GF868’s accuracy depends primarily on the location and alignment of the
transducers on the pipe. In addition to accessibility, when planning for transducer location, consider the following
guidelines:
•Locate the transducers so that there are at least 20 pipe diameters of straight, undisturbed flow upstream and 10
pipe diameters of straight, undisturbed flow downstream from the measurement point. To ensure undisturbed flow,
avoid: sources of turbulence in the fluid such as valves, flanges, expansions and elbows; swirl; and dips or low
spots in which condensed liquid may collect.
•Because condensate or sediment that collects at the bottom of the pipe may cause increased attenuation of the
ultrasonic signal, locate the transducers on the side of a horizontal pipe, where possible. If limited pipe access
necessitates top-mounted transducers and the sound beam path includes a reflection, shift the transducers to at least
10° off top center. This will minimize the influence of any sediment on the reflected ultrasonic signals.
1.3.4 Cable Lengths
Locate the transducers as close as possible to the electronics console. The factory can supply transducer cables up to
500 ft (153 m) in length. For longer distances, consult the factory.

DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) 3
Chapter 1. Installation
1.3.5 Temperature and Pressure Transmitters
When installing temperature and pressure transmitters, locate them downstream of the flowmeter transducers. These
transmitters should be positioned no closer to the flowmeter transducers than 2 pipe diameters and no further away
from the transducers than 20 pipe diameters.
1.3.6 Transducer Cables
When installing the transducer cables, always observe established standard practices for the installation of electrical
cables. Specifically, do not route transducer cables alongside high amperage AC power cables, or any other cables that
could cause electrical interference. Also, protect the cables and connections from the weather and corrosive
atmospheres.
Note: If you are using your own cabling to connect the transducers to the electronics console, the cabling must have
electrical characteristics identical to the cable supplied by GE. Cable must be type RG 62 A/U coaxial cable
(93 ) and each cable must be the same length (within ± 4 in.).
1.4 Installing a Flowcell
A flowcell is the section of pipe where the transducers are mounted. It can be created either by mounting the
transducers on the existing pipeline or on a spoolpiece.A spoolpiece is a separately manufactured pipe section, matched
to the existing pipe, which contains ports for mounting the transducers. This approach allows the transducers to be
aligned and calibrated before mounting the spoolpiece into the pipeline.
Figure 1 on page 4 shows a block diagram of a typical Model GF868 system, including optional pressure and
temperature transmitters. For detailed instructions on installing the transducers and/or spoolpiece, refer to the supplied
drawings and the GE Transducer Installation Guide.
CAUTION! The manual insertion mechanism systems are for low pressure applications (80
psig/5.5 bar or less). Use the appropriate safety precautions when inserting or
withdrawing the insertion mechanism.

Chapter 1. Installation
4 DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
1.4 Installing a Flowcell (cont.)
Figure 1: Model GF868 Flowmeter System
Transducer
Flowcell
Temperature Transmitter
Pressure Transmitter
Preamp
Transducer
Electronics Console
GAS
FLOW

DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) 5
Chapter 1. Installation
1.5 Installing Temperature and Pressure Transmitters
Temperature and pressure transmitters may be installed as part of the flowcell, near the ultrasonic transducer ports. (Be
sure to observe the siting requirements mentioned earlier.) These transmitters must use a 0/4 to 20-mA signal to
transmit temperature and pressure values to the GF868 console. The console, in turn, provides 24-VDC power to the
transmitter. You can use any desired transmitters or sensors; however, they must have an accuracy of 0.5% of the
reading or better.
Note: Resistive Thermal Devices (RTDs) are typically used to measure temperature.
Typically, a 1/2” or 3/4” NPT female threaded port is used to mount the transmitters on the flowcell. If the pipeline is
insulated, you may need to extend the coupling to provide convenient access. Of course, you may also use other types
of mounting ports, including flanged ports, for the transmitters.
The 4 to 20-mA transmitters typically mount directly into the ports as shown in Figure 2. The temperature sensor
should protrude 1/4 to 1/2 way into the pipe.
Figure 2: Typical Temperature/Pressure Transmitter Mounting
1.6 Mounting the GF868 Enclosure
The standard GF868 is housed in a Type-4X weather-resistant enclosure. Other enclosure options are available, and are
discussed in Appendix C. Refer to Figure 8 on page 17 for standard enclosure mounting dimensions. For meters housed
in one of the optional enclosures, a dimensional drawing will be shipped with the unit.
WARNING! Proper grounding of the GF868 chassis is required to prevent the possibility of
electric shock. See Figure 9 on page 18 to locate the internal ground connection.
Temperature Transmitter
Pressure Transmitter
Isolation Valve
Flowcell Wall
Coupling
Thermowell
RTD

Chapter 1. Installation
6DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
1.7 Making Electrical Connections
This section contains instructions for making all the necessary electrical connections to the Model GF868 flowmeter.
See Figure 9 on page 18 for a complete wiring diagram.
Except for the power connector, all terminal blocks are stored in their terminal blocks during shipment and are
removable for more convenient wiring. Feed all cables through the conduit holes on the bottom of the enclosure, attach
the wires to the appropriate connectors, and plug the connectors back into their terminal blocks.
Note: If your unit complies with the European Union’s Low Voltage Directive, it has a transparent plastic cover over
the electrical connections. This cover must remain in place except while you are wiring your unit. Reinstall the
shroud after the wiring has been completed.
Once the GF868 is completely wired, proceed to Chapter 2, Initial Setup, to configure the unit for operation.
1.7.1 Wiring the Line Power
The Model GF868 may be ordered with power inputs of 100-120 VAC, 220-240 VAC, or 12-28 VDC. The label on the
shroud inside the electronics enclosure, just above the TB1 line power terminal block, lists the line voltage setting and
fuse rating for your unit. (The fuse rating also appears in Chapter 4, Specifications.) Be sure to connect the meter only
to the correct line voltage. The allowable line voltages and fuse ratings are shown in Table 1 on page 9.
Note: For compliance with the European Union’s Low Voltage Directive, this unit requires an external power
disconnect device such as a switch or circuit breaker. The disconnect device must be marked as such, clearly
visible, directly accessible, and located within 6 ft (1.8 m) of the GF868.
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! RACK MOUNT CUSTOMERS: Refer to Appendix C for a wiring diagram and
installation information for your unit.
WARNING! To ensure the safe operation of the Model GF868, you must install and operate it as
described in this manual. In addition, be sure to follow all applicable safety codes
and regulations for installing electrical equipment in your area.
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.

DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) 7
Chapter 1. Installation
1.7.1 Wiring the Line Power (cont.)
Refer to Figure 3 on page 7 or Figure 9 on page 18 to locate terminal block TB1 and connect the line power as follows:
1. Remove the plastic shroud that covers the terminal blocks. Be sure to reinstall the shroud after all of the wiring has
been completed.
2. Strip ¼” of insulation from the end of the power and neutral or line leads (or the positive and negative DC power
leads), and ½” from the end of the ground lead.
3. Connect the ground lead to the internal ground connection located on the side panel of the enclosure (see Figure 3
below).
IMPORTANT: The incoming ground lead must be connected to the internal ground connection.
4. Connect the neutral or line lead (or the negative – DC power lead) to TB1-2 and the line power lead (or the positive
+ DC power lead) to TB1-3 as shown in Figure 3 below.
IMPORTANT: Do not remove the existing PC board ground wire or the cover ground wire.
Figure 3: Wiring the Line Power
WARNING! Improper connection of the line power leads, or connecting the meter to the
incorrect line voltage, will damage the unit. It will also result in hazardous voltages
at the flowcell and associated piping and within the electronics console.
1
TB1
N/L2
Ground
23
L1G
Internal
Ground
Connection
PC Board
Ground Wire
Cover
Ground Wire
G – +
AC
DC
AC Line Power
or DC +
AC Neutral/Line
or DC –

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.

DigitalFlow™ GF868 Startup Guide (1 and 2-Channel) 9
Chapter 1. Installation
1.7.4a Wiring the RS232 Interface
The RS232 communications port provides a serial interface in order to connect the GF868 to a printer, an ANSI
terminal or a personal computer.
The RS232 serial interface is wired as Data Terminal Equipment (DTE), and the signals available at the GF868 RS232
terminal block are shown in Table 1 below. Refer to Figure 9 on page 18 to locate terminal block RS232 and complete
the following steps to wire the terminal:
1. Use the information in Table 1 to construct a suitable cable for connecting the GF868 to the external device. (If
desired, an appropriate cable may be purchased from the factory.)
2. Wire the flying leads end of the cable to terminal block RS232 and connect the other end of the cable to the printer,
ANSI terminal or personal computer.
After the wiring has been completed, consult the User’s Manual for the external device to configure it for use with the
GF868.
Table 1: RS232 Connection to DCE or DTE Device
RS232
Pin # Signal Description
DCEDB25
Pin #
DTE DB25
Pin #
DTE DB9
Pin #
1 RTN (Return) 7 7 5
2 TX (Transmit) 2 3 3
3 RX (Receive) 3 2 2
4 DTR (Data Terminal Ready) 20 20 4
5 CTS (Clear to Send) 5 4 8

Chapter 1. Installation
10 DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)
1.7.4b Wiring the RS485 Interface
Use the optional RS485 serial port to network multiple GF868 flowmeters to a single computer terminal. Upon request,
the standard RS232 port on the GF868 may be configured as a two-wire, half-duplex RS485 interface, through a device
such as the INMAC Model 800052 RS232-RS422/RS485 converter.
To wire the RS485 serial port, refer to Figure 9 on page 18 and complete the following steps:
1. Disconnect the main power to the unit and remove the cover.
2. Install the required cable clamp in the chosen conduit hole on the side of the electronics enclosure.
3. Feed one end of the cable through the conduit hole, wire it to terminal block J1 and secure the cable clamp.
Connect the other end of the cable to the converter, as shown in Figure 4.
Figure 4: Typical RS485 Connections
4. If wiring of the unit has been completed, reinstall the plastic shroud, close the cover on the enclosure and tighten
the latches.
5. Connect the converter to the control system, as described in its User’s Manual.
WARNING! To meet CE Mark requirements, all wiring connections must be installed as
described in Appendix A, CE Mark Compliance.
NC 6
NC 7
RX 8
TX 9
1 TD OUT
2
3
4 RD IN
GF868 Converter