Panametrics GF868 Owner's manual

DigitalFlow™ GF868
Ultrasonic flare gas
mass flowmeter
Programming manual (2-channel)

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Panametrics.com
Copyright 2021 Baker Hughes Company. All rights reserved.
DigitalFlow™ GF868
Ultrasonic flare gas mass flowmeter
Programming manual (2-channel)
910-194P2 Rev. F
February 2015
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[no content intended for this page]
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Contents
Chapter 1. Programming site data ......................................................11
1.1 Introduction .....................................................................................11
1.2 Using the keypad ................................................................................11
1.3 Obtaining on-line help .......................................................................... 14
1.4 Using the console control keys .................................................................. 14
1.4.1 Audio alarm volume .....................................................................................14
1.4.2 Stopwatch totalizer.......................................................................................14
1.4.3 Display brightness .......................................................................................14
1.4.4 Display contrast..........................................................................................14
1.5 The user program............................................................................... 15
1.5.1 Entering programming mode............................................................................15
1.6 Entering channel data .......................................................................... 16
1.6.1 Activating a channel .....................................................................................16
1.6.2 Entering system data for a channel ......................................................................17
1.6.3 Entering pipe data .......................................................................................18
1.6.4 Setting up inputs/outputs ................................................................................19
1.6.5 Entering setup data ......................................................................................21
1.7 Entering global data ............................................................................25
1.7.1 Setting the clock ........................................................................................25
1.7.2 Entering global system data ............................................................................26
1.7.3 Setting up global inputs/outputs.........................................................................27
1.7.4 Setting up communications ............................................................................30
1.7.5 MODBUS register map....................................................................................31
1.7.6 Activating security ......................................................................................34
1.8 Saving site files .................................................................................35
1.9 Recalling site files...............................................................................35
Chapter 2. Displaying data ............................................................37
2.1 Introduction ....................................................................................37
2.2 The BIG submenu ...............................................................................38
2.3 The DUAL submenu .............................................................................38
2.4 The GRAPH submenu............................................................................39
2.4.1 Setting up the GRAPH Format ...........................................................................39
2.4.2 Using the GRAPH format.................................................................................39
5

2.5 The LOG submenu...............................................................................40
2.5.1 Entering the LOG submenu..............................................................................40
2.5.2 Numeric format .........................................................................................40
2.5.3 Graphical format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
2.6 Displaying the transducer signal................................................................42
2.7 Setting the LCD backlight .......................................................................44
2.8 Activating sleep mode ..........................................................................44
Chapter 3. Logging data ...............................................................45
3.1 Introduction ....................................................................................45
3.2 Creating a standard log.........................................................................46
3.2.1 Log type................................................................................................. 47
3.2.2 STARTTIME prompt....................................................................................... 47
3.2.3 START DATE prompt...................................................................................... 47
3.2.4 END TIME prompt ........................................................................................ 47
3.2.5 END DATE prompt........................................................................................ 47
3.2.6 DURATION prompt .......................................................................................48
3.2.7 LOG TIME prompt ........................................................................................48
3.2.8 TIME INCREMENT prompt ................................................................................48
3.3 Checking the memory ..........................................................................49
3.4 Stopping a log ..................................................................................49
3.5 Creating an ERROR log ..........................................................................50
3.5.1 Log type..................................................................................................51
3.5.2 STARTTIME prompt........................................................................................51
3.5.3 START DATE prompt.......................................................................................51
Chapter 4. Printing data ...............................................................52
4.1 Introduction ....................................................................................52
4.2 Print live data ...................................................................................53
4.2.1 Numeric format .........................................................................................53
4.2.2 Graphical format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.3 Printing logs ....................................................................................55
4.3.1 Numeric format .........................................................................................55
4.3.2 Graphical format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.4 Print site file.....................................................................................56
4.5 Stop printing ....................................................................................56
4.6 Setting up a printer .............................................................................57
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4.7 Printing signal array data .......................................................................57
4.8 Printing RTD data ...............................................................................58
Chapter 5. Clearing data ..............................................................59
5.1 Introduction ....................................................................................59
5.2 Reset totals .....................................................................................59
5.3 Deleting site files................................................................................60
5.4 Deleting log files ................................................................................60
Chapter 6. Serial communications..................................................... 61
6.1 Introduction .................................................................................... 61
6.2 Wiring the RS232 interface ......................................................................62
6.3 Checking the GF868 baud rate ..................................................................62
6.4 Setting up the terminal software ................................................................63
6.4.1 Windows 3.X systems ...................................................................................63
6.4.2 Windows 9X/NT systems ................................................................................63
6.5 The optional RS485 serial interface..............................................................64
6.5.1 Interface converter mounting...........................................................................64
6.5.2 Point-to-point wiring ....................................................................................64
6.5.3 Multi-point wiring .......................................................................................64
6.6 Setting up an Ethernet connection ..............................................................66
6.7 Setting up a MODBUS/TCP connection...........................................................66
Appendix A. Menu maps...............................................................67
Appendix B. Data records ..............................................................74
B.1 Option cards installed ..........................................................................74
B.2 Initial setup data................................................................................75
Appendix C. Programming with PanaView .............................................77
C.1 Introduction ....................................................................................77
C.2 Wiring the RS232 interface ......................................................................77
C.3 Setting up the communications port ............................................................78
C.3.1 Setting up Ethernet communications ................................................................... 78
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C.4 Adding the GF868 ...............................................................................79
C.5 Editing meter properties ........................................................................80
C.5.1 Setting the meter clock .................................................................................80
C.5.2 Reading transducer signals..............................................................................81
C.5.3 Plotting transducer signals ..............................................................................81
C.5.4 Saving transducer signals ...............................................................................81
C.5.5 Clearing totalizers........................................................................................81
C.5.6 Handling site files .......................................................................................82
C.6 Changing meter settings .......................................................................84
Appendix D. Foundation fieldbus communications .....................................86
D.1 Optional measurements ........................................................................86
D.2 Configuration utility setup ......................................................................87
D.3 Selecting the desired measurements ...........................................................87
D.4 Selecting units for AI blocks .....................................................................88
D.5 Resetting Instrument totalizers..................................................................88
D.6 Function block application ......................................................................89
Appendix E. Foundation fieldbus tables ................................................90
Special conditions for safe use ................................................................................105
Markings .......................................................................................................105
EU / EEA installation compliance ...............................................................................105
Increased safety wiring connections ..........................................................................105
Power connection: .............................................................................................105
All other screw terminal connections:..........................................................................105
8

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.
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.
Safety issues
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.
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!
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.
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.
9

Environmental compliance
Waste Electrical and Electronic Equipment (WEEE)
directive
Panametrics 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 https://www.bakerhughesds.com/health-safetyand-
environment-hse for take-back instructions and more
information about this initiative.
10

Chapter 1. Programming site data
1.1 Introduction
The 2-channel model GF868 flowmeter cannot provide
accurate flow rate measurements for either channel until
the instrument has been properly installed, the channel has
been activated, and the basic system and pipe parameters
have been programmed into the meter. See the startup
guide for detailed instructions on performing these tasks.
After completing the installation, proceed with this chapter
to program the model GF868’s advanced features.
IMPORTANT:
If you are using PanaView™ software to program the
GF868, refer to Appendix C.
Four submenus within the user program provide access to
the various programmable features of the model GF868.
Step-by-step programming instructions for each submenu
are presented in this chapter. Refer to the appropriate
section for a discussion of the following user program
submenus:
• CH1/CH2 - use this submenu to activate a channel and
to enter the basic setup parameters for that channel.
• GLOBL - use this submenu to enter global meter
parameters (i.e., clock, system, input/output,
communications and security), which apply to both
channels.
• SAVE - use this submenu to store both channel and
global data in the meter’s memory, as a site file.
• RECLL - use this submenu to recall and activate
a stored site file.
NOTE:
It is not required that both channels of a 2-channel model
GF868 be installed. The second channel connector may
simply be left vacant for future expansion.
As an aid in following the programming instructions, a
complete menu map of the user program is included in
Appendix A, menu maps.
NOTE:
In the menu map drawings, plain text represents prompt
area messages and boxed text represents option bar
choices. Fx represents a function key to select an option
bar choice.
1.2 Using the keypad
The model GF868 keypad contains 39 keys, which are
labeled with their primary (unshifted) functions. In addition,
pressing the red [SHIFT] key will access the secondary
functions assigned to most of the keys.
The complete keypad is illustrated in figure 1 and a detailed
description of both the unshifted and shifted functions for
each of the 39 keys is listed in Table 1.
NOTE:
Only the [SHIFT] key and the eight [Fx] keys have no shifted
function.
HIJK LMN
W
PROG
Q
EXIT
SCREEN
V
DISP CAL
OP
CLR HELP
LOG 0
XYZ
PRNT 123
45
RST
ENT 6
U
ABCD EFG
789
Figure 1: Model GF868 keypad
NOTE:
Although the keypad is essentially the same, the front
panel layout of meters supplied in one of the optional
enclosures is different. See Appendix C, optional
enclosures, of the startup guide for a picture of the
applicable front panel.
11

Table 1: Model GF868 key functions
Key Unshifted function Shifted
function
Software function keys -
press to select the functions
displayed directly above
them in the option bar.
These keys apply only
to the left pane of the
display screen.
None
Software function keys -
press to select the functions
displayed directly above
them in the option bar.
These keys apply only
to the right pane of the
display screen.
None
Shift key - use this red
key to access the shifted
function of the other keys.
One press shifts the next
keystroke only, while two
presses locks the keypad in
shifted mode. A third press
releases the shift function.
None
Arrow keys - in
measurement mode, use
to scroll through function
choices on the option bar.
In programming mode,
use to scroll through
menu choices. The []
also acts as a backspace
key in programming mode.
Use to enter
the letters A,
B, C and D,
respectively.
Program key - press to
enter the user program.
See 1.5 The user program
for details.
Use to enter
the letter Q.
Table 1: Model GF868 key functions
Key Unshifted function Shifted
function
DISP
Display key - use to
display data in a variety
of numeric and graphic
formatting options. See
Chapter 2. Displaying data
for details.
Use to enter
the letter O.
LOG
Log key - use to set up logs.
See Chapter 3. Logging
data for details.
Use to enter
the letter X.
PRNT
Print key - use to print
live measurements, log
files and signal arrays.
See Chapter 4. Printing data
for details.
Use to enter
the letter R.
CLR
Clear key - use to reset
totals and to delete site
and log files from the
model GF868 memory.
See Chapter 5. Clearing
data for details.
Use to enter
the letter H.
CAL
Calibration key - use to
calibrate the analog inputs
and outputs and to test
the alarm relays and the
totalizer/frequency outputs.
See chapter 1, calibration,
in the service manual
for details.
Use to enter
the letter P.
EXIT
Exit key - use to move
up one level in the user
program or to exit the user
program. See this chapter
for details.
Use to enter
the letter J.
ENT
Enter key - use to confirm
the most recent input
information.
Use to enter
the letter K.
HELP
Help key - use to access
the model GF868’s
context-sensitive on-line
help system. See the next
section for details.
Use to enter
the letter I.
12

Table 1: Model GF868 key functions
Key Unshifted function Shifted
function
SCREEN
Screen key - press the
left side to select the left
display pane or press the
right side to select the right
display pane.
Press the left
side to enter
the letter V
or press the
right side
to enter the
letter W.
Decimal point key - press
to enter a decimal point
during numeric entry.
Use to enter
the letter Z.
Minus key - use to enter a
minus sign or a dash.
Use to enter
a space
character.
0Zero key - use to enter the
number 0.
Use to enter
the letter Y.
1One key - use to enter the
number 1.
Use to enter
the letter S.
2Two key - use to enter the
number 2.
Use to enter
the letter T.
3Three key - use to enter the
number 3.
Use to enter
the letter U.
4Four key - use to enter the
number 4.
Use to enter
the letter L.
5Five key - use to enter the
number 5.
Use to enter
the letter M.
6Six key - use to enter the
number 6.
Use to enter
the letter N.
Table 1: Model GF868 key functions
Key Unshifted function Shifted
function
7Seven key - use to enter the
number 7.
Use to enter
the letter E.
8Eight key - use to enter the
number 8.
Use to enter
the letter F.
9Nine key - use to enter the
number 9.
Use to enter
the letter G.
Audio level key -
press to increase the
audio alarm volume.
Press to
decrease the
audio alarm
volume.
Stopwatch timer key -
press to turn the stopwatch
timer on.
Press to
turn the
stopwatch
timer off.
Backlight key - press to
turn the display backlight
on or to increase its
brightness.
Press to turn
the display
backlight
off or to
decrease its
brightness.
Contrast key - press to
increase the contrast of the
display screen.
Press to
decrease the
contrast of
the display
screen.
13

1.3 Obtaining on-line help
A context-sensitive, on-line help system is programmed into
every model GF868 flowmeter. On-line help, which displays
additional information related to the current task, may be
accessed at any time by pressing the [HELP] key on the
keypad. The help information will be shown on the currently
selected pane of the display screen, as shown in figure 2.
ON-LINE HELP
EXIT ERROR FLOWMORE
Figure 2: Typical on-line help screen
After entering the on-line help system, the following
functions are available on the option bar of the selected
display pane:
• MORE: Press [F1] (or [F5]) to access this function, and the
next screen of text is displayed in the prompt area.
• EXIT: Press [F2] (or [F6]) to access this function, and the
model GF868 returns to measurement mode.
• ERROR: Press [F3] (or [F7]) to access this function, and the
various model GF868 error codes are displayed. Use the
[F1]-[F4] (or [F5]-[F8]) function keys, in conjunction with the
[] and [] keys, to obtain additional information on the
desired error code or to exit the help system.
NOTE:
See the service manual for a complete listing of all error
codes and messages.
• FLOW: Press [F4] (or [F8]) to access this function, and the
various flow measurement parameters are displayed. Use
the [F1]-[F4] (or [F5]-[F8]) function keys, in conjunction with
the [] and [] keys, to obtain additional information on
the desired measurement parameter or to exit the help
system.
1.4 Using the console control keys
The model GF868 has four console control keys, which are
located on the left side of the keypad. Use these keys, which
are described and pictured in table 1, in accordance with the
following instructions:
1.4.1 Audio alarm volume
Use the top console control key to adjust the
audio alarm volume.
Discrete presses will incrementally increase the volume of
the audio alarm. Hold the key down for continuous increase.
Use the key in shifted mode to decrease the volume of the
audio alarm.
1.4.2 Stopwatch totalizer
Use the second console control key for the
stopwatch totalizer.
Press the key once to start the stopwatch totalizer. Press the
key once, in shifted mode, to stop the stopwatch totalizer.
NOTE:
Instructions on properly setting up the stopwatch
totalizer are given later in this chapter. Also, the service
manual provides information on the error response of the
stopwatch totalizer.
1.4.3 Display brightness
Use the third console control key to adjust the
display backlight.
Discrete presses of this key will increase the backlight
brightness through settings of off, mid and full. Discrete
presses of this key in shifted mode, will decrease the
backlight brightness through settings of full, mid and off.
NOTE:
The display backlight has an automatic time-off feature.
See 2.7 Setting the LCD backlight for details.
1.4.4 Display contrast
Use the bottom console key to adjust the
display contrast.
Discrete presses will incrementally increase the display
contrast. Hold the key down for continuous increase. Use the
same key, in shifted mode, to decrease display contrast.
14

1.5 The user program
Use the keypad, as described in chapter 3, operation, of the
startup guide to navigate through the user program. The
menu maps in Appendix A may be followed in sequence,
or the [] and [] keys may be used to scroll through the
prompt screens. The[] key may be used to delete the last
alphanumeric character that was entered from the keypad.
The following discussion assumes that the left screen pane
is active. If the right screen pane is active, only the function
key designations change. That is, replace [F1]-[F4] with
[F5]-[F8]. Also, channel 1 is used in all examples, but the
instructions apply equally to channel 2.
NOTE:
Be sure to record all the programming data entered in this
chapter in Appendix B, data records.
Programming of the ACTIV, SYSTM (ch1 and GLOBL) and PIPE
submenus is necessary for operation of the model GF868.
Failure to accurately enter all of the required information
will result in unreliable flow rate data. Therefore, be sure to
complete at least the sections of this chapter pertaining to
those three submenus.
NOTE:
Because it is so essential, instructions for programming
the ACTIV, SYSTM and PIPE submenus are also included in
the startup guide. If that programming has already been
completed, skip the corresponding sections of this chapter.
Except for the three submenus noted above, it is not
necessary to program the model GF868 flowmeter in any
particular order. Therefore, the sections of this chapter need
not be completed in sequence. Proceed immediately to any
section of interest.
1.5.1 Entering programming mode
To access the user program, press the [PROG] key on the
keypad. The standard measurement mode screen will be
replaced by the following initial programming mode screen:
PROGRAM Start 
PROGRAM
Channel 1
CH1 CH2 GLOBL SAVE
Press the [] and [] keys
and one of the function
keys [F1]-[F4] to select the
desired submenu. From
this screen, press [EXIT] to
return to measurement
mode.
NOTE:
If the security feature is active, enter the password
and press the [ENT] key to enter the user program. See
the SECUR submenu section of this chapter for more
information on the security feature.
15

1.6 Entering channel data
After selecting [F1]=CH1 (or [F2]=CH2) at the initial
programming screen, the following screen appears:
Chan 1 PROGR Start 
Channel PROGRAM
status
ACTIV SYSTM PIPEI/O
Press the [] and [] keys
and a function key [F1]-
[F4] to select the desired
submenu. From this screen,
press [EXIT] to return to the
initial user program screen.
Based on the selection made above, proceed to the
appropriate section of this chapter for instructions.
1.6.1 Activating a channel
The ACTIV submenu activates a channel and selects the
desired measurement method.
1. To enter the channel PROGRAM menu, press [F1]
or [F2] (depending on the desired channel) at the
user PROGRAM prompt.
2. Enter the ACTIV submenu by pressing [F1] at the
channel PROGRAM prompt.
3. Press [F1] (OFF) to deactivate the channel and
return to the channel PROGRAM prompt, or press [F2] to
activate the channel in BURST mode.
4. Press [F1] to select skan mode or [F2] to select
skan/measure mode. The meter will exit the ACTIV
submenu and return to the channel menu screen.
As indicated in the above prompt, the model GF868
flowmeter can take measurements in two different ways:
• Skan is the preferred technique for locating the acoustic
signal and for high velocity measurements. It is more
robust in a noisy environment than the measure
technique.
• Measure is the preferred technique to use for making low
velocity measurements.
If Skan is selected at the next prompt, the instrument uses
this technique exclusively. However, if S/M is selected,
the meter uses skan to find the acoustic signal and then
tries to use the measure technique for a more precise
measurement.
NOTE:
To change the skan and measure parameters, see the
SIGNL submenu section.
1.6.1a Procedure options
After completing the above steps, the meter returns to the
channel PROGRAM prompt. Continue as follows:
• To continue programming the meter, refer to the menu
maps in Appendix A and navigate to the desired menu.
Then, proceed to the appropriate section of this manual
for instructions.
• To leave the user program and retain the previous
settings, press [EXIT] twice and then press [F1] = NO at
the SAVE prompt. Any programming changes will be
discarded and you will be returned to the data display.
• To leave the user program and return to measurement
mode, press [EXIT] twice and then press [F2] = YES at the
SAVE prompt. Your programming changes will be entered
into the meter’s memory, and you will be returned to the
data display.
NOTE:
See the SAVE submenu section for more information on
this function.
16

1.6.2 Entering system data for a channel
Refer to figure 11.
1. To enter the channel PROGRAM menu, press [F1] or
[F2] (depending on the desired channel) at the user
PROGRAM prompt.
2. To program the SYSTM submenu, press [F2] at the
channel PROGRAM prompt.
IMPORTANT:
Do not confuse this SYSTM submenu, which is used to enter
channel-specific information, with the SYSTM submenu
of the GLOBL menu, which is used to enter information
applicable to both channels.
3. Enter a channel label of up to 9 characters.
Press [ENT].
4. Enter a channel message of up to 21 characters.
Press [ENT].
5. Use the [] and [F1]-[F4] keys to select the volumetric
units for the data display, as shown in table 2.
Table 2: Available volumetric/totalizer units
English Metric
Actual units
ACF = Actual cubic feet ACM = Actual cubic meters
KACF = Thousands of ACF KACM = Thousands of ACM
MMACF = Millions of ACF MMACM = Millions of ACM
Standard units
SCF = Standard cubic feet SCM = Standard
cubic meters
KSCF = Thousands of SCF KSCM = Thousands of SCM
MMSCF = Millions of SCF MMSCM = Millions of SCM
6. Use the [F1]-[F4] keys to select the volumetric time
for the data display.
7. Use the [F1]-[F4] keys to select the vol decimal digits
(the number of digits to the right of the decimal point)
in the data display.
8. Use the [] and [F1]-[F4] keys to select the totalizer units
for the data display.
9. Use the [F1]-[F4] to select the total decimal digits
(the number of digits to the right of the decimal point)
in the data display.
10. Use the [F1]-[F4] keys to select the mass flow units
for the data display, as shown in table 3.
Table 3: Available mass flow units
English Metric
LB = Pounds KG = Kilograms
KLB = Thousands of LB TONNE = Metric tons
(1000 KG)
MMLB = Millions of LB
TONS = Tons (2000 LB)
11. Use the [F1]-[F4] keys to select the mass flow time units
for the data display.
12. Use the [F1]-[F4] to select the MDOT decimal digits (the
number of digits to the right of the decimal point) in the
data display.
13. Use the [F1]-[F4] to select the mass (totalizer) for the
data display.
14. Use the [F1]-[F4] to select the mass decimal digits for the
data display.
1.6.2a Procedure options
After completing the above steps, the meter returns to the
channel PROGRAM prompt. Continue as follows:
• To continue programming the meter, refer to the menu
maps in Appendix A and navigate to the desired menu.
Then, proceed to the appropriate section of this manual
for instructions.
• To leave the user program and retain the previous
settings, press [EXIT] twice and then press [F1] = NO at
the SAVE prompt. Any programming changes will be
discarded and you will be returned to the data display.
• To leave the user program and return to measurement
mode, press [EXIT] twice and then press [F2] = YES at the
SAVE prompt. Your programming changes will be entered
into the meter’s memory, and you will be returned to the
data display.
17

1.6.3 Entering pipe data
To program the transducer and pipe parameters via the
PIPE submenu, complete the following steps and refer to
figure 11.
1. To enter the channel PROGRAM menu, press [F1] or
[F2] (depending on the desired channel) at the user
PROGRAM prompt.
2. Press [F3] at the channel PROGRAM prompt.
3. Enter the transducer number (normally engraved on
the head of the transducer). Press [ENT]. If there is no
engraved number, complete the steps below. Otherwise,
proceed to step 4.
IMPORTANT:
Special transducers, which have no engraved number on
the head, are rarely used. Examine the transducer head
carefully for a number.
1.6.3a Special transducers
a. Assign a number between 91 and 99 to the
special transducer and press [ENT]. (The meter
will only accept values from 1 to 199.)
b. Use the [] and [F1]-[F4] keys to select the
frequency of the special transducer. The meter
can not transmit an excitation voltage at the
transducer’s natural frequency without this data.
c. Enter the special transducer time delay (Tw) value
supplied by the factory. Press [ENT]. (The meter will
only accept values from 0 to 1000 µsec.)
NOTE:
Tw is the time required for the transducer signal to travel
through the transducer and its cable. This time delay
must be subtracted from the transit times of the upstream
and downstream transducers to ensure an accurate
measurement.
1.6.3b Pipe OD
4. Enter the known pipe OD or circumference and use the
[F1]-[F4] keys to select the appropriate units. Press [ENT].
(The meter will accept values only from 1/8 to 648 in.)
Table 4: Available pipe OD units
English Metric
inch = pipe OD
in inches
mm = pipe OD
in millimeters
feet = pipe OD
in feet
m = pipe OD
in meters
in/PI = pipe
circumference in
inches
mm/PI = pipe
circumference in
millimeters
ft/PI = pipe circumference
in feet
m/PI = pipe circumference
in meters
The required pipe data may be obtained by measuring
either the pipe outside diameter (OD) or circumference
at the transducer installation site. Alternatively, the
information may be obtained from tabulated data
for standard pipe sizes.
1.6.3c Pipe wall
5. Enter the known thickness of the pipe wall, in the same
units used for the pipe OD. Press [ENT]. (The meter will
only accept values from 0 to 4 in.)
If the pipe wall thickness is not known and cannot be
conveniently measured, look up the value in a table of
standard pipe size data or use the model GF868’s on-line
help menu.
1.6.3d Path length
6. Press [F1] = inch or [F2] = feet to select the units.
Then, enter the path length (P) of the ultrasonic signal.
Press [ENT]. (The meter will only accept values from
1/8 to 900 in.)
NOTE:
The factory has calculated both the transducer signal
path length (P) and the transducer signal axial length (L),
based on the exact transducer configuration used for the
application. These values are engraved on the flowcell
and/or are included in the documentation supplied with
the meter.
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1.6.3e Axial length
7. Press [F1] = inch or [F2] = feet to select the units.
Then, enter the axial length (L) of the ultrasonic signal
and press [ENT].
1.6.3f Reynolds correction
8. Press [F1] to turn Reynolds correction off, or [F2] to
turn it on.
NOTE:
Reynolds correction is a number based on the Kinematic
Viscosity and flow rate of the fluid. It should be enabled for
most applications.
a. When you enable the Reynolds correction factor,
you must also enter the kinematic viscosity
of your gas, as listed in sound speeds and
pipe size data. Use the numeric keys to enter
a value, and press [ENT].
1.6.3g Calibration factor
9. Enter a value for the flow calibration factor and press
[ENT]. The default value is 1.00. (The meter will only accept
values from 0.5000 to 2.0000.)
1.6.3h Procedure options
After completing the above steps, the meter returns to the
channel PROGRAM prompt. Continue as follows:
• To continue programming the meter, refer to the menu
maps in Appendix A and navigate to the desired menu.
Then, proceed to the appropriate section of this manual
for instructions.
• To leave the user program and retain the previous
settings, press [EXIT] twice and then press [F1] = NO at
the SAVE prompt. Any programming changes will be
discarded and you will be returned to the data display.
• To leave the user program and return to measurement
mode, press [EXIT] twice and then press [F2] = YES at the
SAVE prompt. Your programming changes will be entered
into the meter’s memory, and you will be returned to the
data display.
1.6.4 Setting up inputs/outputs
The following specific tasks may be performed via the I/O
submenu:
• Enter a zero cutoff value to eliminate low flow reading
fluctuations
• Set up any optional temperature and/or pressure inputs
Refer to the menu map in figure 12.
NOTE:
Remember to record all programmed data in Appendix B,
data records.
1. To enter the channel PROGRAM menu, press [F1]
or [F2] (depending on the desired channel) at the
user PROGRAM prompt.
2. To enter the I/O submenu, press [F4] at the
channel PROGRAM prompt.
1.6.4a Zero cutoff
3. Enter the desired zero cutoff value and press the [ENT]
key. A value of 0.1 ft/s (0.03 m/s) is recommended, but
values from 0–1 ft/s (0–0.3 m/s) are acceptable.
1.6.4b Temperature input
NOTE:
This option appears only if you have selected standard as
the equation type in the SYSTM submenu.
4. At the temperature input prompt, press [F1] to enter
a constant temperature value or press [Fx] to select
the option card in slot x that will supply the live
temperature input.
NOTE:
Each slot that contains an option card with an analog
input assigned to TEMP or an RTD input will appear on the
option bar. If the process temperature is stable, a fixed
value may be used, but most applications require a live
temperature input.
19

5. Do one of the following:
• If you selected FIXED, enter the known fixed process
temperature. Press [ENT]. (The meter will accept values
only from –148 ° to 662 °F.)
• If you selected SLOT X:
a. Press [F1] to select input A or press [F2] to select
input B. The inputs were labeled during setup.
NOTE:
The set up of input A is used as an example. Identical
procedures would be used to set up input B.
b. Enter the base temperature (from –148 ° to 662°F),
and press [ENT]. The ratio of this value to the actual
temperature is used to calculate the standard
volumetric flow.
1.6.4c Pressure input
6. At the pressure input prompt, press [F1] to enter a
constant pressure value or press [Fx] to select the option
card in slot X that will supply the live pressure input.
NOTE:
Each slot that contains an option card with an analog
input assigned to PRESR will appear on the option bar. If the
process pressure is stable, a fixed value may be used, but
most applications require a live pressure input.
7. Do one of the following:
• If you selected FIXED, enter the known fixed process
pressure. Press [ENT]. (The meter will only accept values
from 0–5000 psia.)
• If you selected SLOT X:
a. Press [F1] to select input A or press [F2] to select
input B. The inputs were labeled during setup.
b. Enter the base pressure (standard) value for the
process, and press the [ENT] key. (The meter will only
accept values from 0–5000 psia .)
IMPORTANT:
If an installed option card does not appear on the option
bar for the TEMPERATURE INPUT or PRESSURE INPUT, the card
may not have been initialized or it may be defective. Call
the factory for assistance.
8. At the N2 input prompt, press [F1] to enter a constant
nitrogen (N2) percentage or press [Fx] to select the option
card in slot X that will supply the live N2 percentage.
9. Do one of the following:
• If you selected FIXED, enter the known fixed N2 value.
Press [ENT]. (The meter accepts values from 0–100%.)
• If you selected SLOT X,
a. Press [F1] to select input A or press [F2] to select
input B. The inputs were labeled during setup.
1.6.4d Procedure options
After completing the above steps, the meter returns to the
channel PROGRAM prompt. Continue as follows:
• To continue programming the meter, refer to the menu
maps in Appendix A and navigate to the desired menu.
Then, proceed to the appropriate section of this manual
for instructions.
• To leave the user program and retain the previous
settings, press [EXIT] twice and then press [F1] = NO at
the SAVE prompt. Any programming changes will be
discarded and you will be returned to the data display.
• To leave the user program and return to measurement
mode, press [EXIT] twice and then press [F2] = YES at the
SAVE prompt. Your programming changes will be entered
into the meter’s memory, and you will be returned to the
data display.
20