Intra Automation digiflow 515 Installation guide

Installation Instruction / Operating Manual
Softwareversion: 2.0 and up
DigiFlow 515
INTRA-AUTOMATION GmbH
Meß- und Regelinstrumente
Otto-Hahn-Straße 20
41515 Grevenbroich
Tel.: [phone]
Fax: [phone]
eMail: [e-mail]
Dok.: df15
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Gas- and Steam Flowcomputer DigiFlow 515 Operating Manual
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Directory
1 INTRODUCTION...............................................................................................................................................................................5
2 ORDERING DETAILS ......................................................................................................................................................................6
3 TECHNICAL DATA ..........................................................................................................................................................................6
4 ALGORITHMS...................................................................................................................................................................................8
5 OPERATION.......................................................................................................................................................................................9
5.1 FRONT VIEW ........................................................................................................................................................................................9
5.2 GENERAL.............................................................................................................................................................................................9
6 APPLICATION.................................................................................................................................................................................10
6.1 THE DIGIFLOW 515 AS GAS COMPENSATION CALCULATOR..................................................................................................................10
6.1.1 Parameter setting of the flow calculator:.................................................................................................................................12
6.1.2 Application for Ideals Gases ....................................................................................................................................................13
6.1.3 Application for General Gases.................................................................................................................................................14
6.1.4 Natural Gas..............................................................................................................................................................................15
6.2 THE DIGIFLOW 515 FOR THE STEAMING QUANTITY MEASURING..........................................................................................................16
6.3 THE DIGIFLOW 515 AS HEAT CONSUMPTION CALCULATOR..................................................................................................................17
6.3.1 Programming The Flow Computer...........................................................................................................................................18
6.4 FILTERING OF THE FLOW INPUT .........................................................................................................................................................19
6.5 CORRECTION OF THE NONLINEARITY .................................................................................................................................................20
6.5.1 Correction for the frequency input ...........................................................................................................................................20
6.5.2 Linearization for the analog input............................................................................................................................................20
7 PROGRAMMING AND PARAMETER SETTING......................................................................................................................21
7.1 KEY DESCRIPTION..............................................................................................................................................................................21
7.2 CONFIGURATION OF A SET..................................................................................................................................................................21
7.3 INPUT OF A NUMBER...........................................................................................................................................................................21
8 MENU TABLES................................................................................................................................................................................22
8.1 MAIN MENU......................................................................................................................................................................................22
8.2 BASE SETUP ......................................................................................................................................................................................22
8.3 MEDIUM PARAMETERS ......................................................................................................................................................................23
8.4 SIGNAL CHECK ..................................................................................................................................................................................23
8.5 FLOW PARAMETERS...........................................................................................................................................................................24
8.6 OPTIONS............................................................................................................................................................................................25
9 INPUT CIRCUITS............................................................................................................................................................................26
9.1 FREQUENCY SIGNAL...........................................................................................................................................................................26
9.2 ANALOG INPUTS.................................................................................................................................................................................28
9.2.1 Input of Pt100 RTD ..................................................................................................................................................................28
9.2.2 Analog 4-20mA input................................................................................................................................................................28
9.3 REMOTE SWITCHED FUNCTIONS..........................................................................................................................................................30
10 OUTPUT CIRCUITS......................................................................................................................................................................31
10.1 DIGITAL OUTPUT..............................................................................................................................................................................31
10.2 RELAY OUTPUT................................................................................................................................................................................32
10.3 RS232 OR RS485 INTERFACE..........................................................................................................................................................32
10.3.1 Hardware................................................................................................................................................................................32
10.3.2 Communication Protocol........................................................................................................................................................33
10.3.3 Printers Protocol....................................................................................................................................................................33
10.3.4 Host–Communication.............................................................................................................................................................33
10.3.5 Network communications........................................................................................................................................................34
11 OPTIONS.........................................................................................................................................................................................35
11.1 ANALOG OUTPUT .............................................................................................................................................................................35
11.2 CONTROL OF A SENSOR–PURGE–UNIT .............................................................................................................................................36
11.2.1 Time diagram Sensor–Purge–Unit.........................................................................................................................................36
11.2.2 Functional description: ..........................................................................................................................................................36
12 INSTALLATION............................................................................................................................................................................37
12.1 GENERAL.........................................................................................................................................................................................37
12.2 REAR VIEW .....................................................................................................................................................................................37
12.3 WIRING DESIGNATIONS....................................................................................................................................................................37
13 BLOCK DIAGRAM .......................................................................................................................................................................39
14 APPENDIX A ERROR DESCRIPTIONS......................................................................................................................................40
15 APPENDIX B PROPERTIES OF SOME GASES: ........................................................................................................................41
16 APPENDIX C APPLICATIONS (EXAMPLES)............................................................................................................................42

Gas- and Steam Flowcomputer DigiFlow 515 Operating Manual
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Note.
The information in this document can be changed without previous announcement.
These instructions do not claim to cover all details or variations in equipment, nor to provide for every possible contin-
gency that may arise during installation, operation or maintenance.
Should further information be desired or should particular problems arise that are not covered sufficiently for the Pur-
chaser’s purposes, the matter should be referred to the local INTRA Sales Office.
The contents of this instructions manual shall not become become part of or modify any prior or existing agreement,
commitment or relationship. The Sales Contract contains the entire obligations of INTRA. The warranty contained in the
contract between the parties is the sole warranty of INTRA. Any statements contained herein do not create new warran-
ties or modify the existing warranty.
Directory of the symbols used in this handbook
Symbol Description SI unit US-unit
A Normalized Signal between 0 and 1 (0 ≡4 mA and 1 ≡20 mA – –
d specific Gravity. Ratio of the density of a gas to the density of air – –
f Frequency Hz Hz
hv, hrspecific Enthalpy at Flow Conditions kJ/kg kJ/kg
h0specific Enthalpy at Reference Conditions kJ/kg
kFk-factor (pulses/unit) for a frequency flowmeter. n/m3n/m3
NoTimebase Constant with which the flowrate is displayed:
1 for units/s,
60 for units/min.,
3600 for units/h,
86,400 for units/d.
– –
p Pressure at Flow Conditions. kPaabs psia
pbPressure at Reference Conditions. kPaabs psia
pkrit Critical Pressure of Gas. kPaabs psia
QEEnergy Value of Steam. MJ/TU BTU/TU
QMMass Flowrate. kg/TU lbs/TU
QVb Corrected Volume Flowrate. m3/TU ft3/TU
SMSpan of Mass kg/TU lbs/TU
SVSpan of Volume. m3/TU ft3/TU
SVb Span of Volume at Reference Conditions. m3/TU ft3/TU
T Temperature at Flow Conditions. K K
TbTemperature at Reference Conditions. K K
Tkrit Critical Temperature of Gas. K K
zfCompressibility at Flow Conditions – –
zbCompressibility at Reference Conditions – –
ρDensity at Flow Conditions. kg/m3kg/m3
ρbDensity at Reference Conditions. kg/m3kg/m3
υSpecific Weight of Steam at Flow Conditions. dm3/kg dm3/kg
υbSpecific Weight of Steam at Reference Conditions. dm3/kg dm3/kg
* TU = Time Unit (d, h, min, s)
Remark:
Are a temperature of 0°C and a pressure of 101,325 kPaabs as normalized conditions programmed, the vol-
ume unit will so be added with the prefix „N“ in the display, to point to this „NORM“-state. If a temperature of
15°C and a pressure of 101,325kPaabs are defined as normalized conditions, then the volume unit will be
prefixed by an „s“, to point to this „standard-conditions, which are often used at US-Units.

Gas- and Steam Flowcomputer DigiFlow 515 Operating Manual
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1 Introduction
The DigiFlow 515 combines compensation for gas and vapors to the following equations:
1. Ideal Gas: Temperature and pressure correction, compressibility correction not required.
2. General Gas: Temperature and pressure correction with compressibility correction calculated using the
Redlich-Kwong1state equation. This equation is suitable for gases with known properties. Information
about common industrial gases are provided in the operating manual.
3. Natural Gas: Compressibility is calculated using the AGA-NX-19-mod equation for natural gases of low
gross caloric value.
4. Steam Flow Computer: Based on the IFC 1967.Mass flow correction of the flowing steam using pressure
and temperature.
5. Energy: The heat quantity is calculated based on enthalpy and mass flow.
6. Energy Balance: . Assuming a mass balance in upstream-and downstream pipe, an energy balance of the
loop is calculated.
Inputs from various of flowmeters are accepted. Examples of these sensors are (VORTEX),turbine, orifice
plate, averaging pitot tubes like (ITABAR-Flow sensor), wedges and target flowmeters.
To increase the measured flowrange of an ITABAR-Flow sensor, it is possible to use two differential pressure
transmitters whose ranges overlap with automatic crossover in the computer.
The device include a scaleable Pulse Output an two scaleable Alarm Relay Outputs.
Optionally this computer includes:
• Up to 3 Analog Outputs 0/4 – 20mA.
• RS485 – Interface.
• Control Relays for an Sensor–Purge–Unit.
A unique feature available with the serial interface is the ability to print flowrates and totals at programmable time
intervals. This enables the instrument to function as a data logger when used in conjunction with a printer, or
other storage device.
1Redlich & Kwong,, „An equation of State“, Chem Rev., vol. 44, p233, 1949

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2 Ordering details


Code Option or Feature
515 Gas- and Steam Flow Computer, Type: DigiFlow 515
Code Housing
S Panel mounting IP54 (Standard)
T Panel mounting with lockable transparent door IP55
Code Power Supply
2 230 V AC mains (Standard)
1 115 V AC mains
4 24 V AC/DC
Code Analog Output
X No Analog Output
1 One Analog Output
2 Two Analog Outputs
3 Three Analog Outputs
Code Communication Port
2 RS232 - Serial Interface (Standard)
4 RS485 - Multipoint Serial Interface
Code Sensor-Purge-Unit
S Without Relay Output
L With Relay Output for Sensor Purge Unit
3 Technical data
General:
Display: Backlighted, alphanumeric LC–Display, 2 rows, 16 cols. Each char is 0.276" high.
Keyboard: Sealed membrane keyboard with four keys.
Transmitter supply: 18 V / 100 mA; via keyboard adjustable, isolated.
Power: 115/230 V AC; 50/60 Hz internally switchable.
Optionally 24-28 V AC/DC
Power consumption 10 W @ 230 V AC without Options.
Operating Temperature:
32 – 131 °F
Housing: Enclosure: glass–fiber reinforced synthetic material; Front: aluminum keyboard membrane.
Face: Watertight to IP 54 (NEMA 4X equal)
Dimensions: 5.7" W ×2.8" H ×5.1" D
Panel cutout: 5.4" W ×2.6" H
Programming and Configuration:
Handheld: There is no handheld terminal required. All necessary constants and parameters are programmed
using the keypad.
Language: German, English or French selectable.
Frequency Input:
Frequency Range: 0.25 - 10 kHz Input 1.
0.25 - 500 Hz Input 2.
Input Circuits: Most AC, logic and proximity switches accepted. 0.5 – 50 Vpp.
Non–Linear Correction:
Up to 12 points for curve fit.

Gas- and Steam Flowcomputer DigiFlow 515 Operating Manual
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Analog Input 4 – 20 mA:
Inputs: 2 for flow (split range), 1 for pressure, and 1 for temperature, for flow correction, or
2 for flow (split range) and 2 for pressure for energy–balance.
Input Impedance: 120 Ω.
Circuit: All inputs are isolated, no common ground.
RTD Input:
Range: -310 to +1472°F.
RTD Type: Pt100 according to DIN 43760.
Non–Linear Correction: The non–linearity of the RTD is internally compensated.
Pressure Input:
Type: Absolute or gauge.
Span: The pressure at 4mA and 20mA are programmable. Linear interpolation for all other points.
Atmospheric pressure: If a gauge pressure sensor is used, the atmospheric pressure must be entered.
Pulse Output:
Pulse Width: Adjustable between 10 ms and 90 ms.
Duty Cycle: ≥1 : 1.
Logic: Open Collector, Active Low.
Current sinking: max. 100 mA.
Pulse generation: The pulse count is proportional to the counter difference in selectable units of 10 (1, 10, 100,
....100000).
External Keyboard:
Function: One input controls the display and one input resets the total-counters.
Circuit: An input voltage higher than +18 V is detected.
Communication Port:
Type: An RS232 interface is provided. Optionally there is a RS485 multipoint communication interface
for up to 32 instruments connected to a common bus.
Baud Rate: 300 – 9600 Baud.
Data Bits: 7 or 8 selectable.
Parity: None, even or odd.
Stop Bits: 1 or 2 selectable.
Data logging: Output in intervals up to 9999 min or by key stroke.
Relay Output:
Function: High– and Low–flow rate alarms based on the flow rate, mass, corrected volume, or energy.
Form: Normally open. (SPST)
Max. Voltage 250 V AC
Max. Current 6 A AC

Gas- and Steam Flowcomputer DigiFlow 515 Operating Manual
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Options:
Analog Outputs:
Function: Selectable: Output current proportional to standard display or of other Parameter See Table on Page
35. Setpoints at 4 mA and 20 mA, linear interpolation between.
Output Span: 0 – 20 mA or 4 –20 mA selectable.
Resolution: 12 Bit
Max. Load: 500 Ωinternally powered.
800 Ωexternally 24 V powered.
Powering: If there is no external supply >15V the output will be internal powered automatically.
Control of a Sensor–Purge–
Unit:
Function: Two relays control the solenoid activated valves of a Sensor Purge Unit. During the purging time
and an additional selectable time after purging, the flow input is maintened.
Time between purging: 10 minutes to 31 days 23 hours 50 minutes.
Purge Duration: 1 to 999 s
Time Constant: 1 to 99 s
4 Algorithms
Ideal Gas:
Display: Corrected Volume (m3or SCF), Mass (kg or lbs)
Temperature Range: -273 °C (-460 °F) to +1,000 °C (1,832 °F)
Pressure Range: 0 kPaabs (0 psia) to 100,000 kPaabs (14,514 psia)
General Gas:
Gases: Handles most gases where critical temperature, critical pressure and specific gravity are known.
Compressibility: Calculation using the Redlich–Kwong equation.
Ranges: Same as Ideal Gas.
Natural Gas:
Gases: Natural Gases with a gross caloric value of 31.8 MJ/m3to 38.8 MJ/m3, specific gravity of 0.554 to
0.75, density at reference conditions of 0.716 kg/m3to 0.970 kg/m3, and a CO2– and N2– molar
fraction of 15% each.
Compressibility: Uses the AGA–NX–19–mod equation.
Temperature Range: -40 °C (-40 °F) to 115,6 °C (240 °F).
Pressure Range: 101.325 kPaabs (14.7 psia) to 13,790 kPaabs (2,001 psia).
Steam:
Calculation: Uses 1967 IFC Formulation (ASME) equations to calculate specific weight and enthalpy of steam.
Steam Type: Liquid Water, saturated and superheated steam.
Temperature Range: 0.01 °C (32.02 °F) to 800 °C (1,472 °F).
Pressure Range: 0 kPaabs (0 psia) to 100,000 kPaabs (14,514 psia).
Saturated steam: Either the temperature or pressure input required (not both).

Gas- and Steam Flowcomputer DigiFlow 515 Operating Manual
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5 Operation
5.1 Front view
5.2 General
The DigiFlow 515 work with a CMOS microprocessor that processes all measurements and takes all control-
ling functions.
All operation parameters and rake constant are programmable and get in a nonvolatile memory filed which
keeps the information after energy loss for at least 40 years.
About the alphanumeric display can information about the parameters and measuring units necessarily be
called.
During the parameter setting can be selected, whether the flow rate is reported as volume or mass when at
gas calculator or as mass or energy when at steaming calculator.
The following data can be fetched in the display by means of the SCAN key during the ongoing measuring: (
also see ` key description ' page 21 )
Gas flow: • Corrected volume (m3or SCF)
• Mass (kg or lbs)
• Temperature and pressure (°C or °F resp. kPa or psi)
• Compressibility factors [except ideal gas]
• Date and time
Steaming flow: • Mass (kg or lbs)
• Energy (MJ or BTU)
• Temperature and pressure in upstream path (°C or °F resp.
kPa or psi)
• Specific Weight and Enthalpy in upstream path (dm3/kg or
kJ/kg)
• Temperature and pressure in downstream path (°C or °F
resp. kPa or psi) [only when energy balance]
• Specific Weight and Enthalpy in downstream path (dm3/kg
or kJ/kg) [only when energy balance]
• Date and time
By means of the TOTAL-key the display changed of the present flow rate and the accumulated flow. If on a
higher level display is switched back to main level.
A higher display level is also exited without any key actuation after about 60 seconds.
If the accumulated flow is displayed, the sum counters can be deleted about the CURSOR-key. This function
can be inhibited at the configuration.
By simultaneous pressure the TOTAL-key and the SCAN key the calculator is switched into the parametrising
and configuration mode. Herein all necessary inputs are made for the special application. The keys partly get
another function for this menu level. By means of the SCAN-key is scrolled through the sub-menus of a menu
level. The ENTER-key then serves the subroutine-call to the selected menu item. At the input of numerical
values about the CURSOR-key an input place is selected which is represented by the flashing cursor. This
place then can be adjusted to the desired value by means of the SCAN-key. this can be set to the value ‘0’ by
pressing the TOTAL–key.
LED-Indikators
of TOTAL-Key,
and Alarm
relays
Alphanumeric LC-
Display 2 Rows /
16 Columns
TOTAL CURSOR SCAN ENTER

Gas- and Steam Flowcomputer DigiFlow 515 Operating Manual
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6 Application
6.1 The DigiFlow 515 as gas compensation calculator.
Flow equations for gases
This chapter is only of meaning for flow measurings at gases. If the flow medium is steam, you can change
for chapter 5.2 on page 16 at once.
The flow calculator DigiFlow 515 process the input signals of a wide range of flowmeters by the equations
defined below.
Mass flow and corrected volume are shown and processed in SI units. For explanation about the following
abbreviations see listing at the beginning of the operating instruction.
2 formulas form the basis for all other equations:
!Specific Gravity
d=Molecular Weight of Gas
Molecular Weight of Air
d=Molecular Weight of Gas
28.9625 [1]
"Density of a gas ρ0, at Reference Conditions:
in SI-Units:ρ03
34834
=⋅⋅
⋅




.dp
zT kgm
b
bb
[2]
The conditions all calculations are being based (‘NORM“-conditions), will be entered by the user. Most times
these will be set to:
•Temperature 0 °C (273.15 K) and Pressure 101.325 kPaabs
A: Volumetric Flowmeters With Frequency Output.
(e.g. VORTEX, turbine or PDF with Pulse Output).
QNf
kp p
T
T
z
z
Vb
Fb
bb
f
=⋅⋅⋅⋅
0[4]
QQ
MVb
=⋅
ρ
[5]