Remote Automation Solutions Linear Meter Flow Calculation Program User Manual (For the FloBoss 107) Manuals & Guides

Remote Automation Solutions

Part D301754X012

April 2021

Linear Meter Flow Calculation Program
User Manual (for FloBoss™ 107)

Linear Meter Flow Calculation Program User Manual

ii Revised April-21

Contents

Chapter 1 – Introduction 1

1.1 Scope and Organization...................................................................................................................... 1

1.2 Product Overview ................................................................................................................................ 1

1.3 Program Requirements ....................................................................................................................... 3

Chapter 2 – Installation 5

2.1 Downloading the Program .................................................................................................................. 5

Chapter 3 – Configuration 1

3.1 Linear Meter Setup Screen ................................................................................................................. 2

3.1.1 Linear Meter Setup Screen – General Tab ............................................................................ 4

3.1.2 Linear Meter Setup Screen – Inputs Tab ............................................................................... 8

3.1.3 Linear Meter Setup Screen – Advanced Tab ....................................................................... 11

3.1.4 Linear Meter Setup Screen – Fluid Properties Tab ............................................................. 14

3.1.5 Linear Meter Setup Screen – Sampler Tab ......................................................................... 17

3.1.6 Linear Meter Setup Screen – Calibration Factors Tab ........................................................ 19

3.1.7 Linear Meter Setup Screen – Alarms Tab ........................................................................... 21

3.2 Linear Meter Values Screen ............................................................................................................. 24

3.2.1 Linear Meter Values –Values Tab ........................................................................................ 26

3.2.2 Linear Meter Values Screen – Calculated Factors Tab ....................................................... 28

3.3 Saving the Configuration ................................................................................................................... 30

Chapter 4 – Reference 32

4.1 Calculation Details ............................................................................................................................ 32

4.2 Point Type 31: Linear Meter Setup ................................................................................................... 34

4.3 Point Type 32: Linear Meter Values .................................................................................................. 36

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Chapter 1 – Introduction

1.1 Scope and Organization

This document serves as the user manual for the Linear Meter Flow
Calculation User Program (QER 08Q026) for use in a FloBoss™ 107
(FB107). This manual describes how to download and configure the
program (referred to as the “Linear Meter program” or “the program”
throughout the rest of this manual). You access and configure this program
using ROCLINK™ 800 Configuration Software (version 2.60 or greater)
loaded on an personal computer running Windows® 2000 (with Service
Pack 2), Windows XP (with Service Pack 3), or Windows Vista™ (32­bit), or Windows 7 (32-bit and 64-bit).

The sections in this manual provide information appropriate for first-time
users. Once you become familiar with the procedures and the software
running in a FB107, the manual becomes a reference tool.

This manual has the following major sections:

▪ Chapter 1 – Introduction
▪ Chapter 2 – Installation
▪ Chapter 3 – Configuration
▪ Chapter 4 – Reference

This manual assumes that you are familiar with the FB107 and its
configuration. For more information, refer to the following manuals:

▪ FloBoss 107 Flow Manager Instruction Manual (part

D301232X012)

▪ ROCLINK 800 Configuration Software User Manual (for FB107)

(part D301249X012)

1.2 Product Overview

The Linear Meter program allows a FB107 to interface with meters whose
flow input is proportional to either the mass flow or the uncorrected
volumetric flow. Meter types with flow input proportional to the
uncorrected volumetric flow includes turbine, vortex, ultrasonic, and
positive displacement meters. While meter types with flow input
proportional to the mass flow include Coriolis meters. Volume, mass flow
rates, and totals are calculated and stored for both volumetric and mass
meters. The program uses the corresponding meter run point in the
FB107’s firmware to store Linear Meter calculated values and
accumulations. Additional configuration parameters are in the program’s
user-defined point types.

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For natural gas measurement with turbine meter (per AGA Report #7 2006
edition), the Linear Meter program is NOT required, as this functionality
for a volume type turbine meter for natural gas measurement is built into
the FB107 firmware. However, the program does provide an additional
implementation of this calculation and can be used in place of the
firmware.

You enable the Linear Meter calculation for meter runs with Linear Meter
hardware installed. With the calculation enabled, the FB107 bypasses the
standard meter run flow calculations and performs the Linear Meter
calculation instead. All standard meter run parameters, as well as the
additional Linear Meter parameters, are available for assignment to
Modbus registers, PID control loops, historical archiving, and FST
functions.

The program is designed to integrate with the properties calculation
included in the FB107 Firmware (AGA Report #8, 1992 edition for natural
gas and other related hydrocarbons), or other fluids whose properties are
provided by a separate user program installed in the FB107 (such as water
and steam). The only fluid properties used by the Linear Meter program
are the flowing and base densities. When correcting from volume at
flowing conditions to volume at base conditions, the ratio of the flowing
density to the base density is used.

When a meter type of mass (Coriolis) is used, the program provides the
ability to correct for the effect of pressure on the mass flowrate and
accumulation. This feature is used for enhanced accuracy in high pressure
Coriolis applications. This correction can be applied inside the Coriolis
device itself, or within the FB107 Linear Meter program. However, it is
common to apply this correction in the FB107, as it is likely to contain the
live value from a pressure transmitter.

When used in conjunction with the FB107 Micro Motion Coriolis
Interface Module, the program provides integration between the raw
Coriolis data (without the use of pulses) and the FB107 meter runs. Linear
Meter program accumulations are determined by detecting the incremental
increases in the Coriolis Interface Module accumulator and adding that to
the totals. Conversions between volume and mass units are handled
automatically when the Coriolis Interface Module is used.

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1.3 Program Requirements

You download the Linear Meter program to—and then run it from—the
Flash and RAM memory on the FloBoss 107 with firmware version 1.40
(or greater). Download and configure the program using the ROCLINK 800
Configuration software version 2.60 (or greater).

Notes:

▪ Two versions of the program for QER 08Q026 are included.

Installation and operation are identical between the two programs, but
they use different point type locations, different display numbers, and
are loaded into different program slots on the FB107.
LinearMeter_5.bin loads into user program location 5 and User
Defined Points (UDP) 31 and 32. LinearMeter_6.bin loads into user
program location 6 and User Defined Points (UDP) 33 and 34. Install
the program version that avoids point type conflicts with currently
installed programs.

▪ This document shows the installation of LinearMeter_5.bin. The

installation process and functionality are the same for all version of the
Linear Meter Flow Calculation Program.

The downloadable program is:

File Name

Target Unit/

Version

User Defined

Point (UDP)

Flash Used

(in bytes)

DRAM Used

(in bytes)

ROCKLINK 800

Version

Display

Number

LinearMeter_5-1_05.bin

1.05

31, 32

13293

16,384

2.60

32, 33

LinearMeter_6-1_05.bin

1.05

33, 34

13293

16,384

2.60

34, 35

Note: You must connect a PC to the FloBoss’s LOI port before starting

the download.

For information on viewing the memory allocation of user programs, refer
to the ROCLINK 800 Configuration Software User Manual (for FB107)
(part D301249X012).

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Chapter 2 – Installation

This section provides instructions for installing the Linear Meter program
into the FB107. Read Section 1.3 of this manual for program requirements.

2.1 Downloading the Program

This section provides instructions for installing the user program into
FloBoss memory.

Note: Connect a PC to the FloBoss’s LOI port before starting the

download.

To download the user program:

1. Start and logon to ROCLINK 800.

2. Select ROC > Direct Connect to connect to the FloBoss unit.

3. Select Utilities > User Program Administrator from the ROCLINK

menu bar. The User Program Administrator screen displays
(see Figure 1):

Figure 1. User Program Administrator

4. Click Browse in the Download User Program File frame. The Select

User Program File screen displays (see Figure 2).

5. Select the path and user program file to download from the CD-ROM.

(Program files are typically located in the Program Files folder on the

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CD-ROM). As Figure 2 shows, the screen lists all valid user program
files with the .BIN extension:

Figure 2. Select User Program File

6. Click Open to select the program file. The User Program

Administrator screen displays. As shown in Figure 3, note that the
Download User Program File frame identifies the selected program
and that the Download & Start button is active:

Figure 3. User Program Administrator

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7. Click Download & Start to begin loading the selected programs. The

following message displays:

Figure 4. Confirm Download

Note: For the FB107, ROCLINK800 assigns program positions based

on memory allocations. For this reason, the LinearMeter_5.bin
program automatically installs as program 5. For
LinearMeter_6.bin program automatically installs as program

6.

8. Click Yes to begin the download. During the download, the program

performs a warm start, creates an event in the event log, and—when
the download completes—displays the following message:

Figure 5. ROCLINK 800 Download Confirmation

9. Click OK. The User Program Administrator screen displays (see

Figure 6). Note that:

▪ The User Programs Installed in Device frame identifies the loaded

program.

▪ The Status field indicates that the program is running.

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Figure 6. User Program Administrator

10. Click Close and proceed to Chapter 3 to configure the program.

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Chapter 3 – Configuration

After you have downloaded and started the Linear Meter program, you
configure the program and view calculation results using the ROCLINK
800 software. To do this, you use two program-specific screens (Linear
Meter Setup and Linear Meter Values):

▪ Use the Linear Meter Setup screen to set the parameters for the meter

run.

▪ Use the Linear Meter Values screen to view results from the Linear

Meter calculations.

Note: Configure history points after you configure the Linear Meter

program. To configure history points, refer to Table 7-2. EFM
History Points (AGA 7) in Section 10.2 of the ROCLINK800
Configuration Software User Manual (for FloBoss 107),
(part D301249X012).

Figure 7. ROCLINK 800

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3.1 Linear Meter Setup Screen

Once you have successfully loaded the Linear Meter program into the
FloBoss, you can access the Linear Meter Setup screen and configure the
meter runs.

To access this screen:

1. Click User Program > Linear Meter > Display #32, Linear Meter

Setup from the ROCLINK configuration tree:

2. Double-click #1, Meter #1. The Linear Meter screen displays

(see Figure 8):

Figure 8. Linear Meter Setup

Note: Six fields at the top of the screen (Point number, Program Status,

Meter Tag, Meter Description, Active Calculations – Flow, and
Active Calculations – Fluid Props) appear on all tabs.

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3. Review and change as necessary the values in the following fields:

Field

Description

Point Number

Selects the meter run to configure. Click  to
display all defined instances. Clicking a different
meter run causes the screen to display the
values for that meter run.

Program Status

This read-only field shows the current state of
the user program. Valid values are: Program Not

Loaded, Program Loaded – Not Started,
Program Running, Program Shutting Down,
and Not Running – Library Version Error.

Meter Tag

Sets the unique identifier for the selected meter.

Meter Description

Sets the description of the selected meter.

Flow

This read-only field shows the flow calculation
standard currently performing flow calculations
for the selected meter run.

Fluid Props

This read-only field shows the properties
calculation standard currently performing
properties calculations for the selected meter run.

4. Click Apply to save your changes, and proceed to Section 3.1.1 to

configure the General tab.

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3.1.1 Linear Meter Setup Screen – General Tab

Use the General tab (which displays when you access the Linear Meter
Setup screen) to enable the Linear Meter calculation, specify the averaging
technique used by the program, and define program-specific options.

Figure 9. Linear Meter, General Tab

1. Review and change as necessary the values in the following fields:

Field

Description

Linear Meter

Enables or disables the Linear Meter program to
perform the flow calculations for the selected
meter run. Valid selections are Enabled or
Disabled.

Meter Type

Sets the type of meter associated with the meter
run. Valid selections are Volume (volume
metering device such as a turbine meter) or
Mass (Micro Motion Coriolis Mass Meter or
similar mass meter).

Note: This field displays only if you select
Enabled for the Linear Meter option.

Units for Heating
Value, Alarms, and
Sampler

Sets the type of units used for heating value,
alarms, and sampler of the meter run. Valid
selections are Volume, (units are BTU/CF or
MJ/M3, Ft3 or M3, etc) and Mass (units are
BTU/Lb or MJ/Kg, Lb or Kg, etc).

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Field

Description

Flow Alarming

Enables or disables flow alarming for the meter.

If enabled, alarm status changes are added to
the Alarm Log. Use the Alarms tab to configure
the alarms. If disabled, no alarm generates for
this meter, regardless of the alarm
configuration.

Base Multiplier Value
(BMV) Integral
Multiplier Value (IMV)

Sets, in minutes, how frequently the system
recalculates the fluid properties and resulting
Base Multiplier Value (BMV) (per the API

measurement standard Chapter 21, Section 1).
If the flow calculation for the meter run is AGA3­92, ISO5167-2003, or another calculation
standard where the flow input is a differential
pressure, this field is labeled Integral Multiplier
Value (IMV).

Averaging Technique

Sets the averaging technique for determining
the average static pressure and flowing
temperature during each BMV/IMV for the meter
run. If the flow input is from a differential

pressure meter, the average differential
pressure is also determined. For further details,
see API measurement standard Chapter 21,
Section 1, Appendix B. Valid selections are:

Flow
Dependant
Linear

Calculates the average static
pressure and average flowing
temperature with equal weighting
given to each sample when there
is flow through the meter. For
samples in which there is no flow,
the value is not included in the
average. However, if there is no
flow during the BMV/IMV, the
system determines averages
using all of the samples.

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Field

Description

Flow
Dependant
Formulaic

Calculates averages for the static
pressure and flowing temperature
where each sample is raised to
the power to which the parameter
is raised in the flow equation, with
equal weighting given to each
sample when there is flow
through meter. For samples
where there is no flow, the value
is not included in the averaging.
However, if there is no flow during
the BMV/IMV, averages are
determined using all of the
samples. At the end of the
BMV/IMV, the resulting average is
raised to the reciprocal of the
power to which the value is raised
in the flow equation.

Note: Flow Dependent Linear

and Flow Dependent
Formulaic averaging yield
the same result when used
with linear meters.

Flow
Weighted
Linear

Calculates averages for the static
pressure and flowing temperature
with weighting for a sample being
the ratio of the flow through the
meter at the time of the sample to
the total flow during the BMV/IMV.
For samples where there is no
flow, the value is not included in
the average. However, if there is
no flow during the BMV/IMV,
averages are determined using all
of the samples.

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Field

Description

Flow
Weighted
Formulaic

Calculates averages for the static
pressure and flowing temperature
where each sample is raised to
the power to which the parameter
is raised in the flow equation, with
weighting for a sample being the
ratio of the flow at the time of the
sample to the total flow during the
BMV/IMV. For samples where
there is no flow, the value is not
included in the average. However,
if there is no flow during the
BMV/IMV, averages are
determined using all of the
samples. At the end of the
BMV/IMV, the resulting average is
raised to the reciprocal of the
power to which the value is raised
in the flow equation. With a linear
meter, flow weighted formulaic
averaging yields the same result
as flow weighted linear averaging.

Note: Flow Weighted Linear and

Flow Weighted Formulaic
averaging yield the same
result when used with
linear meters.

Active Flow Alarms

This display-only field shows any alarm

currently active. For example, Low indicates
that the calculated flow is below the Low Alarm
limit. Other alarms can include High, No Flow,
and Manual Mode.

2. Click Apply to save any changes, and proceed to Section 3.1.2 to

configure the Inputs tab.

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3.1.2 Linear Meter Setup Screen – Inputs Tab

Use the Inputs tab to define the inputs used by the Linear Meter
calculation.

To access this screen:

1. Select the Inputs tab on the Linear Meter Setup screen. One of the

following four screens displays:

Note: This tab displays only if you select Enabled for Linear Meters

on the General tab.

Figure 10(a). Linear Meter Setup, Inputs tab

(Meter Type is Volume, I/O Definition is a PI Point)

Figure 10(b). Linear Meter Setup, Inputs tab

(Meter Type is Volume, I/O Definition is an Analog Value)

Figure 10(c). Linear Meter Setup, Inputs tab

(Meter Type is Mass, I/O Definition is a PI Point)

Figure 10(d). Linear Meter Setup, Inputs tab

(Meter Type is Mass, I/O Definition is an Analog Value)

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2. Review and change as necessary the values in the following fields:

Field

Description

Uncorrected Volume

Sets the parameter for the uncorrected volume
flow rate from the meter. Click to display the
Select TLP dialog box you use to assign the
parameter. The units for the uncorrected volume
value are MCF/Day or kM3/Day.

If the parameter for the uncorrected volume flow
rate is from a PI point, select parameter 13
(EU). If the parameter for the uncorrected
volume flow rate is an analog value, select that
parameter.

Note: This field displays only if the meter type

is volume.

Mass

Sets the parameter for the mass flow rate from
the meter. Click to display the Select TLP
dialog box you use to assign the parameter. The
units of the mass are Mlb/Day or Tonnes/Day.

If the parameter for the mass flow rate is from a
PI point, select parameter 13 (EU). If the
parameter for the mass is an analog value,
select that parameter.

Note:

▪ This field displays only if the meter type

is mass (Coriolis).

▪ When the program is used with the

Micro Motion Coriolis Interface Module,
this should be set to the module's
forward mass flow rate, parameter 11
(Mass Flow Rate Fwd" of point type 65.

Static Pressure

Sets the parameter for the static pressure. Click
to display the Select TLP dialog box you use to
assign the parameter. The units for the static
pressure are PSIG/PSIA or kPa(g)/kPa(a).

Temperature

Sets the parameter for the flowing temperature
of the fluid. Click to display the Select TLP
dialog box you use to assign the parameter. The
units for the flowing temperature are Deg F or
Deg C.

Accumulator

Sets the parameter for an accumulator
containing the current amount of flow measured
by the meter. It is assumed that this parameter
rolls over at 1,000,000.0 and is in the
appropriate units. When the program is used in
conjunction with the Micro Motion Coriolis
Interface Module, this should be set to the

module’s ongoing mass accumulator, parameter

171 (Mass Accumulated) of point type 65. The
program will automatically convert the mass to
the required units in this case.

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Field

Description

No Flow Time

Sets the amount of time without a pulse, in
seconds, before the no flow status is set.

Note: This field displays only if the I/O

Definition for the flow rate parameter is a
PI point.

Low Flow Cutoff

Sets the low flow cutoff point. When the value of
the flow input parameter is less than or equal to
this value, the calculated flow rate is set to zero
and, if alarming is enabled, the No Flow alarm
status is set and an entry is made in the Alarm
Log. The units of the low flow cutoff are
MCF/Day or kM3/Day.

Note: This field displays only if the I/O

Definition for the flow rate parameter is
an analog value.

Static K Factor

Sets the K factor when the variable K factor is
disabled or the I/O definition for the flow rate
parameter is an analog value. If the flow rate
parameter is an analog value, pulses are
generated from the analog value and added to
the total pulses stored in parameter 59 of point
type 47. If the variable K factor is enabled, the
static K factor is the last K factor calculated from
the variable K factor table. The K factor is the
number of pulses per unit of flow. The units are
pulses/Cf, pulses/M3, pulses/Lb, or pulses/Kg.

Variable K Factors

Enables the use of the variable K Factor table
and sets the K Factor values over a range of
pulse frequencies. The units of the values of the
K Factor are pulses/Cf, pulses/M3, pulses/Lb, or
pulses/Kg. The units of the pulse frequencies
are Hz. If this field is Disabled, the Static K
Factor is used.

Note: These fields display only if the I/O

Definition for the flow rate parameter is a
PI point.

3. Click Apply to save any changes, and proceed to Section 3.1.3 to

configure the Advanced tab.

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3.1.3 Linear Meter Setup Screen – Advanced Tab

Use the Advanced tab to define additional meter run information for the
Linear Meter flow calculation.

To access this screen:

1. Select the Advanced tab on the Linear Meter Setup screen. One of the

following two screens displays:

Note: This tab displays only if you select Enabled for Linear Meters

on the General tab.

Figure 11(a). Linear Meter Setup, Advanced tab

(Meter Type is Volume)

Figure 11(b). Linear Meter Setup, Advanced tab

(Meter Type is Mass)

2. Review and change as necessary the values in the following fields:

Field

Description

Atmospheric Pressure

Sets how the program determines atmospheric
pressure (absolute) at the metering location.
Valid selections are Calculate (calculate
atmospheric pressure from other parameters
defined on this screen) or Enter (use the value,
either as PSIA or kPa(a), entered in the field in
this frame). The default is Enter.

Note: If you select Enter, the value must be

greater than zero.

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Field

Description

Gravitational
Acceleration

Sets how the program determines gravitational
acceleration at the metering location. Valid
selections are Calculate (calculate gravitational
acceleration from other parameters defined on
this screen) or Enter (use the value, either as
Ft/Sec2 or M/Sec2, entered in the field in this
frame). The default is Calculate.

Note: If you select Enter, the value must be

greater than zero.

Base Pressure

Sets, in PSIA or kPa(a), the flow measurement
base pressure specified in the gas contract.

Base Temperature

Sets, in degrees Fahrenheit or degrees Celsius,
the flow measurement base temperature
specified in the gas contract.

Elevation

Sets, in feet or meters above sea level, the
elevation of the metering location.

Latitude

Sets, in degrees, the latitude of the metering
location.

Correction for Pressure
Effect on Mass Flow
Accuracy

Enables or disables the correction of the mass
flow input due to pressure effects.

Note: This field displays only if the meter type

is mass (Coriolis).

Calibration Pressure

Sets the calibration pressure of the mass flow
meter for determining the pressure effect
correction of the mass flow input. Units are
PSIG or kPa(g).

Note: This field displays only if the meter type
is mass (Coriolis).

Pressure Effect

Sets the coefficient for the effect of pressure on
the mass flow accuracy. Units are %/PSI or
%/kPa.

Note: The flow computer implementation of the

correction for pressure effect on mass
flow accuracy requires the Pressure
Effect to be entered as a negative
number as indicated in the sensor
product data sheet.

Force Recalculation

Forces the program to recalculate the flow
without waiting for the next normal recalculation.
Select Set and click Apply to force the
recalculation.

Note: You define normal recalculation periods

using the Base Multiplier Period field
(located on the Linear Meter Setup
screen’s General tab).

Limit Meter Events

Sets whether the FB107 logs all flow-related
events. Valid selections are Enabled (log all
events) or Disabled (do not log events).

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Field

Description

Pressure Tap

Sets the reference of the static pressure. This
field must match how the sensor or transmitter
actually measures the static pressure. Valid
selections are Gauge and Absolute.

3. Click Apply to save any changes, and proceed to Section 3.1.4 to

configure the Fluid Properties tab.

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3.1.4 Linear Meter Setup Screen – Fluid Properties Tab

Use the Fluid Properties tab to define the fluid composition and other
properties.

To access this screen:

1. Select the Fluid Properties tab on the Linear Meter Setup screen.

Note: This tab displays only if you select Enabled for Linear Meters

on the General tab.

Figure 12. Linear Meter Setup, Fluid Properties tab

2. Review and change as necessary the values in the following fields:

Field

Description

Composition

Sets the mole percent for each gas component.
If the FPV Method is Detailed, the value in the
Total Mole % field must equal 100%. If the FPV
Method is Gross1, only the mole % of CO2 must
be entered. If the FPV Method is Gross2, the
mole % of CO2 and the mole % of N2 must be
entered.

FPV Method

Sets the method of determining the
compressibility factors for AGA8 calculations.
Valid selections are:

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Field

Description

Detailed

Requires the natural gas
composition in mole percent to
be entered for all components.

Gross1

Requires the specific gravity of
the natural gas, the real gas
gross heating value per unit
volume, and the mole % of CO2
to be entered.

Gross2

Requires the specific gravity of
the natural gas, the mole % of
CO2, and the mole % of N2 to be
entered.

Note: If you choose either Gross1 or Gross2,

you must manually enter values for
Specific Gravity and Heating Value on
this screen. Gross2 only requires a value
for Heating Value if you’re calculating the
gas energy flow.

While the Detailed method provides the
highest accuracy in a broad range of
measurement conditions, you can use
either of the Gross methods when:

▪ Temperature is between 32F and

130F (0C and 54C).

▪ Pressure is between 0 and 1200 PSIA

(0 and 8274 kPa(a)).

▪ Gas composition is within the Normal

range, as defined in the 1992 AGA8
report.

Heating Value

Sets how the system determines the heating
value of the gas. Valid selections are Calculate
(allow the system to calculate the heating value
from the gas composition data) or Enter (use
the value specified in the energy calculation).

Note: Set the Units for Heating Value, Alarms,

and Sampler parameter on the General

tab to select volume or mass
measurement in English units (BTU/CF
or BTU/Lb) or metric units (MJ/M3 or
MJ/Kg).

Heating Value Basis

Identifies the basis the system uses to
determine the heating value for flow or energy
calculations. Valid selections are:

Dry

No water vapor present in gas.

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Field

Description

Wet

Saturated water vapor present
in gas.

Note: When you select this

option, the FB107
calculates the mole
percentage of water
based on the algorithm
from IAPWS—IF97
standards and adjusts
the other mole
percentages accordingly.

As Delivered

Gas may contain some water
vapor.

Specific Gravity

Sets the ratio of the molar mass of the gas to
the molar mass of the air. Valid selections are

Calculate (the system calculates the value) and
Enter (use the specific value for the flow

calculation).
Note: If you select Enter, the value should

represent the gas at standard conditions
and cannot be less that 0.07.

Viscosity

Sets the dynamic viscosity of the flowing gas.
Units are Lbm/Ft-Sec (English units) or cP
(metric units).

Sp Heat Ratio

Sets the specific heat ratio of the gas (defined

as the specific heat of the gas at constant
pressure divided by the specific heat of the gas
at constant volume). Accepted practice for
natural gas applications is to use a value of 1.3,
which was used to develop the expansion factor
tables in the AGA 3 Report – Part 3. If entered,
the value must be greater than zero.

Gas Quality

Sets the source for the gas compositions and
other properties. Valid selections are Constant

(readings are manually entered and changes
are added to the event log) or Live (readings
come from a gas chromatograph or are

periodically downloaded from a host and
changes are not added to the event log).

Log Methane Adjust

Sets if system adjustments to the methane
composition are added to the event log. Valid
selections are Enabled (adjustments are added
to the event log) or Disabled (adjustments are
not added to the event log).

3. Click Apply to save any changes, and proceed to Section 3.1.5 to

configure the Sampler tab.

Linear Meter Flow Calculation Program User Manual

Revised April-21 17

3.1.5 Linear Meter Setup Screen – Sampler Tab

Use the Sampler tab to set up the discrete output (DO) to send a pulse
output to another device, such as an odorizer, or to control a gas sampler
for a meter run.

To access this screen:

1. Select the Sampler tab on the Linear Meter Setup screen.

Note: This tab displays only if you select Enabled for Linear Meters

on the General tab.

Figure 13. Linear Meter Setup, Sampler tab

2. Review and change as necessary the values in the following fields:

Field

Description

Sampler Control

Enables sampling for the meter run. When
enabled, the Output Point is set when the
previous flow matches or exceeds the value in
the Sampler Accum field.

Output Point

Sets the parameter for the output to drive the
sampler. Click to display the Select TLP
dialog you use to define the parameter. It must
be parameter 3 of a DO point.

Linear Meter Flow Calculation Program User Manual

18 Revised April-21

Field

Description

Sampler Accum

Sets the quantity of fluid that must pass before
the status of the Output Point is set. Units are
Cf, M3, Lb, or Kg based on the Units Type for
Heating Value, Alarms, and Sampler on the
General tab.

Sampler Duration

Sets the duration, in seconds, for holding the
status of the Output Point to ON when the
quantity of fluid passed matches or exceeds the
Sampler Accum.

3. Click Apply to save any changes, and proceed to Section 3.1.6 to

configure the Calibration Factors tab.

Linear Meter Flow Calculation Program User Manual

Revised April-21 19

3.1.6 Linear Meter Setup Screen – Calibration Factors Tab

Use the Calibration Factors tab to define information related to pressure
calibration.

To access this screen:

1. Select the Calibration Factors tab on the Linear Meter Setup screen.

Note: This tab displays only if you select Enabled for Linear Meter

on the General tab.

Figure 14. Linear Meter Setup, Calibration Factor tab

2. Review and change as necessary the values in the following fields:

Field

Description

Dead Weight
Calibration: Static
Pressure

Sets if the program compensates the static
pressure value for the difference between the
gravitational acceleration at the location where
the static pressure was calibrated and the
gravitational acceleration associated with the
dead weight calibrator.

Calibrated Gravitational
Acceleration

Sets the gravitational acceleration associated
with the dead weight calibrator. The units are
Ft/Sec2 or M/Sec2.

Linear Meter Flow Calculation Program User Manual

20 Revised April-21

Field

Description

User Correction Factor

Sets a multiplier value to adjust the flow for
factors not included with the Linear Meter
program.

Note: Use the default value of 1.0 if no

correction is desired.

3. Click Apply to save any changes, and proceed to Section 3.1.7 to

configure the Alarms tab.

Linear Meter Flow Calculation Program User Manual

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3.1.7 Linear Meter Setup Screen – Alarms Tab

Use the Alarms tab to define information related to flow alarming.
To access this screen:

1. Select the Alarms tab on the Linear Meter Setup screen.

Note: This tab displays only if you select Enabled for Linear Meter

on the General tab.

Figure 15. Linear Meter Setup, Alarms tab

2. Review and change as necessary the values in the following fields:

Field

Description

Time Basis for Alarming

Sets the parameter whose value is to be used
for alarming. If Alarm on Daily Flow Rate is
selected, the daily volume or mass flow rate is
used for alarming. If Alarm on Hourly Flow
Rate is selected, the hourly volume or mass flow
rate is used for alarming. The use of the volume
or mass flow rate is dependent on the Units
Type for Heating Value, Alarms, and Sampler on
the General tab.

Linear Meter Flow Calculation Program User Manual

22 Revised April-21

Field

Description

Low Alarm Limit

Sets the value below which the calculated flow
rate must fall to generate a low alarm. The units
are MCF/Day, CF/Hour, Mlb/Day, Lb/Hour,
kM3/Day, M3/Hour, Tonnes/Day, or Kg/Hour.

Note: Default value is 0.0 Mlb/Day if you

select Mass for Units for Heating Value,
Alarms and Sampler on the General tab
and 0.0 MCF/Day if you select Volume
for Units for Heating Value, Alarms and
Sampler on the General tab.

High Alarm Limit

Sets the value above which the calculated flow
rate must rise to generate a high alarm. The
units are MCF/Day, CF/Hour, Mlb/Day, Lb/Hour,
kM3/Day, M3/Hour, Tonnes/Day, or Kg/Hour.

Note: Default value is 10,000 Mlb/Day if you

select Mass for Units for Heating Value,
Alarms and Sampler on the General tab
and 10,000 MCF/Day if you select
Volume for Units for Heating Value,
Alarms and Sampler on the General tab.

Alarm Deadband

Sets a value that defines a zone above the Low
Alarm limit and below the High Alarm limit.
When an alarm condition is set, the flow rate
must clear the alarm limit plus the zone defined
by the deadband, before the alarm condition
clears. This deadband prevents the system from
setting and clearing the alarm continuously
when the input value is oscillating around the
alarm limit. The units are MCF/Day, CF/Hour,
Mlb/Day, Lb/Hour, kM3/Day, M3/Hour,
Tonnes/Day, or Kg/Hour.

Note: Default value is 0.0 Mlb/Day if you

select Mass for Units for Heating Value,
Alarms and Sampler on the General tab
and 0.0 MCF/Day if you select Volume
for Units for Heating Value, Alarms and
Sampler on the General tab.

RBX Alarming

Sets alarming options for initiating Report-by­Exception messages. These messages are sent
out through communication ports that have RBX
mode enabled.

Disabled

RBX Alarming is turned off.

On Alarm
Set

When the point enters an alarm
condition, the FB107 generates
a Report-by-Exception message
to the host.

On Alarm
Clear

When the point leaves an alarm
condition, the FB107 generates
a Report-by-Exception message
to the host.

Linear Meter Flow Calculation Program User Manual

Revised April-21 23

Field

Description

On Alarm
Set and
Clear

In either condition, an RBX
message generates to the host.

3. Click Apply to save any changes.

4. Click Close to close this screen, and proceed to Section 3.2 to

configure the Linear Meter Values screen.

Linear Meter Flow Calculation Program User Manual

24 Revised April-21

3.2 Linear Meter Values Screen

Use this screen to view the results and calculation factors used in Linear
Meter calculations

To access this screen:

1. Click User Program > Linear Meter > Display #33, Linear Meter

Values from the ROCLINK configuration tree:

2. Double-click #1, Meter #1. The Linear Meter Values screen displays:

Figure 16. Linear Meter Values

Note: Six fields at the top of the screen (Point number, Program Status,

Meter Tag, Meter Description, Active Calculations – Flow, and
Active Calculations – Fluid Props) appear on all tabs.

3. Review and change as necessary the values in the following fields:

Field

Description

Point Number

Selects the meter run to configure. Click  to

display all defined instances. Clicking a different

meter run causes the screen to display the

values for that meter run.

Program Status

This read-only field shows the current state of
the user program. Valid values are: Program

Not Loaded, Program Loaded – Not Started,
Program Running, Program Shutting Down,
and Not Running – Library Version Error.

Meter Tag

This read-only field shows the unique identifier
for the selected meter.

Linear Meter Flow Calculation Program User Manual

Revised April-21 25

Field

Description

Meter Description

This read-only field shows the description of the

selected meter.

Active Calculations:
Flow

This read-only field shows the flow calculation

standard currently performing flow calculations

for the selected meter run.

Active Calculations:
Fluid Props

This read-only field shows the properties

calculation standard currently performing

properties calculations for the selected meter

run.

4. Click Apply to save any changes, and proceed to Section 3.2.1 to

configure the Values tab.

Linear Meter Flow Calculation Program User Manual

26 Revised April-21

3.2.1 Linear Meter Values –Values Tab

Use the Values tab (which displays one of the following three screens
when you access the Linear Meter Values screen) to view results of the
Linear Meter calculations.

Figure 17(a). Linear Meter Values,Values tab

(Meter Type is Volume)

Figure 17(b). Linear Meter Values, Values tab

(Meter Type is Mass)

1. Review the values in the following fields:

Field

Description

Uncorrected Volume

This read-only field displays uncorrected

volume flow rate, which is the volumetric flow

input before any density correction is applied.

The units are MCF/Day or kM3/Day.

Note: This field displays only if you select

Volume for meter type on the General

tab of the Linear Meter Setup screen.

Uncompensated Mass

This read-only field displays uncompensated

mass flow rate, which is the mass flow input

before pressure compensation is applied. The

units are Mlb/Day or Tonnes/Day.

Note: This field displays only if you select Mass

(Coriolis) for meter type on the General
tab of the Linear Meter Setup screen.

Static Pressure

This read-only field displays current static

pressure in PSIG, PSIA, kPa(g) or kPa(a).

Flowing Temperature

This read-only field displays current flowing

temperature in Deg F or Deg C.

Current Accumulator
Value

If an accumulator type meter is in use, this

read-only field displays the value of the

accumulator read during the current second.

Previous Accumulator
Value

If an accumulator type meter is in use, this

read-only field displays the value of the

accumulator read during the previous second.

Linear Meter Flow Calculation Program User Manual

Revised April-21 27

Field

Description

Current Flow Rate –
Volume

This read-only field displays current hourly and

daily flow rates in CF/Hour and MCF/Day or

M3/hr and kM3/Day.

Current Flow Rate –
Energy

This read-only field displays current hourly and

daily energy rates in BTU/Hour and

MMBTU/Day or MJ/Hour and GJ/Day.

Current Flow Rate –
Mass

This read-only field displays current hourly and

daily mass rates in Lb/Hour and Mlb/Day or

Kg/Hour and Tonnes/Day.

Accumulation –
Uncorrected

This read-only field displays uncorrected

volume total flow in MCF or Km3 for the current

day, the previous day, the current month, the

previous month, and the accumulated total

since the accumulator last reset.

Accumulation – MCF

This read-only field displays total flow in MCF

or kM3 for the current day, the previous day, the

current month, the previous month, and the

accumulated total since the accumulator last

reset.

Accumulation –MMBTU

This read-only field displays total energy in

MMBTU or GJoules for the current day, the

previous day, the current month, the previous

month, and the accumulated total since the

accumulator last reset.

Accumulation – Mlb

This read-only field displays total mass in Mlb

or Tonnes for the current day, the previous day,

the current month, the previous month, and the

accumulated total since the accumulator last

reset.

Accumulation – Minutes

This read-only field displays flowing time in

Minutes for the current day, the previous day,

the current month, the previous month, and the

accumulated total since the accumulator last

reset.

2. Click Apply to save any changes and proceed to Section 3.2.2 to

configure the Calculated Factors tab.

Linear Meter Flow Calculation Program User Manual

28 Revised April-21

3.2.2 Linear Meter Values Screen – Calculated Factors Tab

Use this tab to view calculation factors used in Linear Meter calculations.
To access this screen:

1. Select the Factors tab on the Linear Meter Values screen. One of the

following two screens displays:

Note: This tab displays only if you select Enabled for the Linear

Meter on the General tab of the Linear Meter Setup screen.

Figure 18(a). Linear Meter Values,Values tab

(Meter Type is Volume)

Figure 18(b). Linear Meter Values, Values tab

(Meter Type is Mass)

2. Review the values in the following fields:

Field

Description

Uncorrected Volume

This read-only field displays the uncorrected

volume flow rate, which is the volumetric flow

input before any density correction is applied.

The units are MCF/Day or kM3/Day.

Note: This field displays only if you select

Volume for meter type on the General

tab of the Linear Meter Setup screen.

Uncompensated Mass

This read-only field displays the

uncompensated mass flow rate, which is the

mass flow input before the correction for

pressure effect is applied. The units are Mlb/Day

or Tonnes/Day.

Note: This field displays only if you select

Mass (Coriolis) for meter type on the

General tab of the Linear Meter Setup
screen.

Flowing Density

This read-only field shows the calculated

density at flowing conditions in Lb/CF or Kg/M3.

Linear Meter Flow Calculation Program User Manual

Revised April-21 29

Field

Description

Base Density

This read-only field shows the calculated

density at base conditions in Lb/CF or Kg/M3.

BMV

This read-only field displays the base multiplier

value (BMV), which is the factor for multiplying

by the uncorrected volume flow rate to

determine the corrected volume flow rate.

Note: This field displays only if you select

Volume for meter type on the General

tab of the Linear Meter Setup screen.

Pressure Effect
Correction Factor

This read-only field displays the pressure effect

correction factor, which is calculated from the

pressure effect coefficient and the difference

between the flowing and calibration pressures.

Note: This field displays only if you select

Mass (Coriolis) for meter type on the

General tab of the Linear Meter Setup

3. Click Apply to save any changes.

4. Click Close to close this screen. Proceed to Section 3.3 to save your

configuration.

Linear Meter Flow Calculation Program User Manual

30 Revised April-21

3.3 Saving the Configuration

Whenever you modify or change the configuration, it is a good practice to
save the final configuration to memory. To save the configuration:

1. Select ROC > Flags. The Flags screen displays:

Figure 19. Flags

2. Click Save Configuration. A verification message displays:

Figure 20. Save Verification

Linear Meter Flow Calculation Program User Manual

Revised April-21 31

3. Click Yes. When the save process completes, a confirmation message

displays:

Figure 21. Confirmation

Note: Depending on the size and complexity of the user program, this

process may take several minutes. When the process ends, the
Status field on the Flags screen displays Completed.

Figure 22. Flags, Status - Completed

4. Click Update on the Flags screen. This completes the process of

saving your new configuration.

Note: For archive purposes, you should also save this configuration

to your PC’s hard drive or a removable media (such as a flash
drive) using the File > Save Configuration option on the
ROCLINK 800 menu bar.

Linear Meter Flow Calculation Program User Manual

32 Revised April-21

Chapter 4 – Reference

This section provides calculation details and tables of information on the
user defined points used by the Linear Meter Flow Calculation program.

▪ Calculation Details
▪ Point Type 31: Linear Meter Setup
▪ Point Type 32: Linear Meter Values

4.1 Calculation Details

The Linear Meter flow calculations are based on equations presented in
the following flow calculation standards.

▪ Measurement of Gas by Turbine Meters, Transmission

Measurement Committee Report No. 7, American Gas Association
(AGA), Second Revision, April, 1996.

▪ Measurement of Natural Gas by Coriolis Meter, AGA Report No.

11, API MPMS 14.9, Transmission Measurement Committee,,
American Gas Association (AGA), 2003.

Each of these flow calculation standards can be implemented using the
Linear Meter program. However, AGA7 is already available with the
FB107 Application Firmware, so it is recommended to use that
implementation for meter runs requiring AGA7.

If you specify Volume as meter type, the flow calculations are:
Q

b

= Qf * ρf / ρb

q

m

= Qb * ρb

where:
Qb = Volumetric flow at base conditions. Units are MCF or kM3.

Qf = Volumetric flow at flowing conditions (uncorrected flow).

Units are MCF or kM3.
qm = Mass flow. Units are Mlb or Tonnes.
ρb = Density at base conditions. Units are Lb/CF or Kg/M3.
ρf = Density at flowing conditions. Units are Lb/CF or Kg/M3.

Linear Meter Flow Calculation Program User Manual

Revised April-21 33

If you specify Mass (Coriolis) as meter type, the flow calculations are:
q

m

= q

m,u

* F

P

Q

b

= qm / ρ

b

where:
FP = Correction for pressure effect on the mass flow accuracy.
Qb = Volumetric flow at base conditions. Units are MCF or kM3.
qm = Mass flow. Units are Mlb or Tonnes.

q

m,u

= Mass flow before correction for pressure effect. Units are

Mlb or Tonnes.
ρb = Density at base conditions. Units are Lb/CF or Kg/M3.

If correction for pressure effect is enabled:
FP = 1.0 / (1.0 + (KP / 100.0) * (Pf – Pc))
where:

KP = Pressure effect coefficient. Units are %/PSIG or %/kPa(g).
Pf = Calibration pressure. Units are PSIG or kPa(g)
Pc = Flowing pressure. Units are PSIG or kPa(g)

If correction for pressure effect is disabled:
FP = 1.0

With both volume and mass meters, the program updates flow inputs once
a second and calculates approximations of the flow rates and totals. The
program revises approximated flow totals at the specified base multiplier
period (BMP) using the total of flow input, base density, and average
flowing density (recalculated using the average pressure and temperature
during the BMP).

Linear Meter Flow Calculation Program User Manual

Revised April-21 34

4.2 Point Type 31: Linear Meter Setup

Point type 31 contains the parameters for configuring the Linear Meter program. There are four logicals of this point type (one logical for each
meter run).

Point Type 31: Linear Meter Setup

Parm

#

Name

Access

Data Type

Length

Range

Default

Description of functionality and meaning

of values

0

Point Tag ID

R/O

AC

10

0x20 -> 0x7E for

Each ASCII

character

“ “

Point tag identification. This value is copied
from point type 46, parameter 0.

1

Enable Linear Meter

R/W

UINT8 1 0 -> 1

0

Enable/disable status of the linear meter
flow calculation for the meter run. Valid
values are:

0 = Disable
1 = Enable

2

Meter Type

R/W

UINT8 1 0 -> 1

0

Type of meter. Valid values are:
0 = Volume – The flow input is

proportional to the uncorrected
volumetric flow.

1 = Mass (Coriolis) – The flow input is

proportional to the mass flow.

3

Press Effect Enable

R/W

UINT8 1 0 -> 1

0

If the meter type is volume:
Not used.
If the meter type is mass (Coriolis):
Enable/disable the correction for the

pressure effect on the mass flow
accuracy. Valid values are:

0 = Disable
1 = Enable

Linear Meter Flow Calculation Program User Manual

Revised April-21 35

Point Type 31: Linear Meter Setup

Parm

#

Name

Access

Data Type

Length

Range

Default

Description of functionality and meaning

of values

4

Calibration Pressure

R/W

FL

4

Any floating point

number

0.0

If the meter type is volume:
Not used.
If the meter type is mass:
Calibration pressure of the mass meter

from which the correction for the
pressure effect on the mass flow
accuracy is determined. Units are PSIG
or kPa(g).

5

Press Effect Coeff

R/W

FL

4

Any floating point

number

0.0

If the meter type is volume:
Not used.
If the meter type is mass:
Pressure effect coefficient for the mass

meter. Units are %/PSIG or %/kPa(g).
The correction for pressure effect on
mass flow accuracy requires the
pressure effect coefficient to be a
negative number as indicated in the
sensor product data sheet.

6

Accumulator TLP

R/W

TLP

3

Any valid TLP

0,0,0

Accumulator Input for this program.
Configuring this parameter triggers the
Linear Meter program to read the parameter
specified by Accumulator TLP and use its
value, along with the specified rate, to
calculate accumulated totals.

NOTE: The Linear Meter Program assumes

that the accumulator is in the
correct units for the meter run in
which it is used.

Linear Meter Flow Calculation Program User Manual

36 Revised April-21

4.3 Point Type 32: Linear Meter Values

Point type 32 contains the calculated parameters for the Linear Meter program. There are four logicals of this point type (one logical for each
meter run).

Point Type 31: Linear Meter Setup

Parm

#

Name

Access

Data Type

Length

Range

Default

Description of functionality and meaning

of values

0

Point Tag ID

R/O

AC

10

0x20 -> 0x7E for

Each ASCII

character

“ “

Point tag identification. This value is copied
from point type 46, parameter 0.

1

Press Effect Factor

R/O

FL

4

Any floating point

number

1.0

If the meter type is volume:
Not used.
If the meter type is mass (Coriolis):
Pressure effect correction factor, which is

calculated from the pressure effect
coefficient and the difference between the
flowing and calibration pressures.

2

Current Accumulator Value

R/O

FL

4

Any floating point

number

0.0

The value of the accumulator read during the
current second.

3

Previous Accumulator Value

R/O

FL

4

Any floating point

number

0.0

The value of the accumulator read during the
previous second.

4

Value From Accumulator

R/O

FL

4

Any floating point

number

0.0

The current value of the accumulator.
NOTE: This parameter is not part of the

Linear Meter Program’s calculations,

and is only used to display the
current value of the accumulator on
the Meter Inputs Tab. When used
with the Micro Motion Coriolis
Interface Module, the units will be
automatically converted as required

Linear Meter Flow Calculation Program User Manual

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