SITRANS CV

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• Информационные материалы

  Информационные материалы

  The SITRANS CV gas chromatograph (GC), which is based on the innovative analytical technology of the MicroSAM, is an analyzer that has been specially developed for natural gas analysis. The device concept enables the higher and lower calorific value, standard density and Wobbe index (according to ISO, AGA 8, Gost standard) to be determined in a way that is not only cost-effective, but also quick, precise and reliable.

  Область применения

  • Analysis of natural gas in power plants:
    • For quality control
    • For turbine optimization
    • Pipeline monitoring
  • Analysis of natural gas when opening up sea beds (off-shore plants).
  • Analysis of bio-natural gas in preprocessing plants
  • Analysis of natural gas in liquefaction and regasification plants (LNG Regasification and Storage)
  • Determination of calorific value in natural gas for power plants, in gas transfer stations, or during turbine optimization
  • Analysis of calorific value in natural gas preparation plants

  Дизайн

  Enclosure

  • Ex d version standard
  • Heating adjustable from 60 to 165 °C (isothermal)
  • Decentralized installation close to sampling point

  Analytical modules

  The compact analytical modules contain all the functional components of a chromatograph. The SITRANS CV operates with:

  • Live injection
  • Valveless live switching on microchip basis
  • Standardized analytical modules
  • Multidetection through use of up to 8 micro thermal conductivity detectors in smallest possible areas (e.g. on all column/purging outputs and injection)

  Функции

  Live injection

  The SITRANS CV has a two-stage injection system. Using a micro injection valve, a defined quantity of sample is first brought up to the carrier gas pressure. This eliminates the pressure-dependent error in the dosing quantity present with conventional systems. In the second stage, the sample is transferred to the column by a valveless micro injection system (live dosing). The result is an "active" injection.

  The injection volume can be varied time-controlled, and exactly matched to the column requirements.

  Valveless live column switching

  Because of the high dead volume of conventional valves, only the valveless version can be considered for a miniaturized system. In this case, the generation of differences in flow using several electronic pressure regulators at appropriate positions of the column setup causes a change in the flow directions. (The system operates according to the Wheatstone principle, but pneumatically.) The functions "Cut" and "Backflushing" can then be implemented free of dead volume.

  The column system

  The separation system consists of up to three separation columns connected in series. Micro TCDs or micro live circuits are installed in sequence ("inline") upstream and downstream of the individual columns. Three electronic pressure regulators supply the columns with carrier gas and carry out the switching functions (injection, backflushing and cut).

  By using narrow-bore capillary columns, the separation at high resolution is carried out within a much shorter time, approx. factor 2 to 3 compared to standard capillary columns.

  Electronic pressure regulators

  A high pressure stability together with rapid changing rates in the hPa range are required for precise and fast switching. This is achieved in the electronic pressure regulators by means of a piezo actuator.

  Detector

  The micro TCDs (silicon wafer technology) work on the principle of continuous measurement of the different thermal conductivities of the carrier gas and the components to be measured.

  The measurement can be carried out without falsification by avoiding catalytic effects on the heating wires and maintaining a constant flow velocity. This permits consistent in-line detection, i.e. without qualitative or quantitative losses of substances.

  Modules

  The standardized application modules generally feature live injection and live switching functions, detectors and separation columns.

  	Detector	Column 1	Detector	Column 2	Detector	Circuit	Column 3	Detector
  C09 Injection		Sil5 Non-polar aromatic and aliphatic hydrocarbons	TCD	Sil5 Non-polar aromatic and aliphatic hydrocarbons	TCD	Live	Porabond Q All components except molecular filter components	TCD
  C01 Injection	TCD	Sil5 C3, C4, C5, C6+	TCD	PoraPLOT/Porabond Q CO2, C2, H2O	TCD	Live	Molecular filter H2, (Ar+O2), N2, C1, CO	TCD
  C13 Injection	TCD	RTX-1 C3, i-C4, n-C4, neo-C5, i-C5, n-C5 Sum C6+ as sum peak in the backflush	TCD	HayeSepN N2, CH4, CO2, C2	TCD	Live

  
  
  

  Application

  The SITRANS CV is a storage product. Precalibration is carried out at the factory, using helium and argon (as the carrier gas) and a calibration gas. The measured components and switching functions (live injection, backflushing, cut) are saved in the GC. The calibration process itself should be performed during commissioning on-site.

  Measurements can be made within the following working ranges:

  Component	Checked working range (%)	Possible working range (%)
  Methane	57 ... 100	50 ... 100
  Nitrogen1)	0 ... 22	0 ... 25
  Carbon dioxide	0 ... 12	0 ... 20
  Ethane	0 ... 14	0 ... 20
  Propane	0 ... 5	0 ... 15
  i-butane	0 ... 0.9	0 ... 10
  n-butane	0 ... 1.8	0 ... 10
  Neopentane	0 ... 0.1	0 ... 1
  i-pentane	0 ... 0.12	0 ... 1
  n-pentane	0 ... 0.12	0 ... 1
  Hexane+2)	0 ... 0.08	0 ... 3
  Hexane		0 ... 1
  Heptane+3)		0 ... 1
  Octane		0 ... 1
  Nonane+4)		0 ... 1
  Helium	Concentration can be entered as a fixed value in the component list
  H2S	< 500 ppm	No measured component
  High/low calorific value	Calculated	Calculated
  Density and relative density	Calculated	Calculated
  Wobbe index	Calculated	Calculated
  Compressibility factor	Calculated	Calculated
  Normalization factor	Calculated	Calculated

  
  
  

  Table 1: Measured components and performance parameters for Pos. 8_0 (master setup, standard calorific value analysis in accordance with ISO 6976-1995)

  ¹⁾ Any oxygen or carbon monoxide present in the sample will be detected along with the nitrogen and, therefore, taken into account when the nitrogen concentration is determined.

  ²⁾ Hexane+ = group_{(iso/n-hexane to iso/n-nonane)}

  ³⁾ Heptane+ = group_{(iso/n-hexane)} and group_{(iso/n-heptane to iso/n-nonane)}

  ⁴⁾ Nonane+ = group_{(iso/n-hexane)}, group_{(iso/n-heptane)}, group_{(iso/n-octane)}, group_{(iso/n-nonane)}

  Component	Possible working range (%)
  Oxygen	0 ... 4

  
  
  

  Table 2: Measuring range of the additional measured component oxygen of the extended calorific value analysis (see article no. 7KQ3105-1)

  The remark in footnote 1 about the detection of oxygen and nitrogen is not valid in the case of an extended calorific value analysis. In this case, all components from Table 1 "Measured components and performance parameters for Pos. 8_0 (master setup, standard calorific value analysis in accordance with ISO 6976-1995)" plus oxygen are detected and quantified.

  For the analysis of biomethane the following components and their working ranges are measured (Table 3).

  Component	Possible working range (%)	Calibration gas for biomethane measurement (%).
  Methane	> 80	89
  Nitrogen	< 8	4
  Ethane	< 6	2.5
  Carbon dioxide	< 4	2.5
  Propane	< 5	1.0
  Butane	< 1.2	0.2
  Oxygen	< 3	0.2
  2-Methylpropane (isobutane)	< 0.7	0.2
  Hydrogen	< 3	0.2

  
  
  

  Table 3: Measured components, working ranges and calibration gas for the analysis of biomethane

  For analysis of natural gas with backflush summation, the following components and working ranges are measured:

  Component	Possible working range (%)
  Methane	50 ... 100
  Nitrogen	0 ... 25
  Carbon dioxide	0 ... 20
  Ethane	0 ... 20
  Propane	0 ... 15
  i-butane	0 ... 10
  n-butane	0 ... 10
  Neopentane*
  i-pentane	0 ... 1
  n-pentane	0 ... 1
  Hexane+	0 ... 3
  Helium	Concentration can be entered as a fixed value in the component list
  H2S	No measured component
  High/low calorific value	Calculated
  Density and relative density	Calculated
  Wobbe index	Calculated
  Compressibility factor	Calculated
  Normalization factor	Calculated

  
  
  

  Table 4: Component and measuring ranges for the analysis, including backflush summation

  * Because the neopentane concentration is very small in practice, this component is not calibrated and is measured with the relative response factor of isopentane. For this reason, a possible working range is not indicated.

  Analyses within the checked working range as well as the quality parameters resulting from these (high and low compression and normalization factors, calorific value, density, relative density and Wobbe index) correspond to the requirements listed below.

  Measurements within the scope of the possible working ranges (Table 1 "Measured components and performance parameters for Pos. 8_0 (Master setup, standard analysis of calorific value in accordance with ISO 6976-1995)", right column, and Table 2 "Measuring range of the additional measured component oxygen of the extended analysis of calorific value (see article no. 7KQ3105-1)") are possible. However, checking of the repeatability and correctness has not been carried out by the official German body "Physikalisch technischer Bundesanstalt (PTB)".

  Concentration range (mol.%)	Repeatability according to ISO 6974-5 (2001); molar fraction (%), absolute
  50 < xi < 100	0.03 ... 0.035
  1 < xi < 50	0.011 ... 0.03
  0.1 < xi < 1	0.006 ... 0.011
  xi < 0.1	< 0.006

  
  
  

  Table 5: The repeatability of the measured components complies with ISO 6974-5 (2001) – Annex B (article no. 7KQ3105-0, 7KQ3105-1)

  The repeatability of the calorific value and standard density achieve a relative standard deviation of < 0.01%. SITRANS CV for the analysis of biomethane achieves a relative standard deviation of < 0.05%.

  The calibration gas is an extremely important factor for consideration in terms of the MPE (maximum permissible error), and has a significant effect on the accuracy of the overall measuring system. For this reason, SITRANS CV - based on a comparative measuring procedure - can never be more accurate than the calibration gas used. Other parameters besides the accuracy data on the calibration gas certificate are important for the accuracy of a system. Examples of these include the optimum gas composition, the ambient temperatures of the calibration gas cylinders during transportation and operation, potential condensation of, for instance, higher hydrocarbons in a calibration gas cylinder, and the functionality of the sample preparation system.

  Under optimum conditions, the SITRANS CV achieves an MPE of < 0.1% for the calorific value and the standard density, whereby the system for measuring biomethane produces an MPE of < 0.5%.

  SITRANS CV is designed for measuring with various configurations; the calibration gases required for this purpose are shown below. (Table 6, Measurement and calibration gas components):

  SITRANS CV – Overview of possible configurations and the required calibration gases
  Carrier gas	He	He		Ar	He
  Analyzer module	C09	C01		C01	C13
  	Calorific value analysis C6+	Calorific value analysis C6+ with oxygen	Basic Bio-CH4	Extended calorific value analysis Bio-CH4	C6+ backflush
  Calculation standard	Calculation standard is ISO 6976, GOST and AGA 8 can be selected
  Article No.	7KQ 3105-0	7KQ 3105-1		7KQ 3105-2	7KQ 3105-2
  Hydrogen	-	-	-	M CR	-
  Oxygen	-	M CR	M CR	M CR	-
  Nitrogen	M CR	M CR	M CR	M CR	M CR
  Carbon dioxide	M CR	M CR	M CR	M CR	M CR
  Methane	M CR	M CR	M CR	M CR	M CR
  Ethane	M CR	M CR	-	M CR	M CR
  Propane	M CR	M CR	-	M CR	M CR
  Isobutane	M CR	M CR	-	M CR	M CR
  Butane	M CR	M CR	-	M CR	M CR
  Neopentane	M*1	M*1	-	-	M*1
  Isopentane	M CR	M CR	-	-	M CR
  Pentane	M CR	M CR	-	-	M CR
  Group C6+	M*2 CR	M*2 CR	-	-	-
  Group C6+ backflush	-	-	-	-	M*2 CR
  	Extended application 7KQ 3105- B02
  Separate measurement of Group C6 and Group C7+	M*3 CR*3	M*3 CR*3	-	-	-
  Separate Groups C6, C7, C8, C9	M*4 CR*4	M*4 CR*4	-	-	-
  Caution!	Use of the SITRANS CV with a carrier gas different to that of the supplied solution can lead to faults and to the destruction of the analysis module. Depending on the composition of the calibration gas, external heating for the calibration gas cylinder may be necessary.
  M	Measured
  CR	Required as calibration component; composition see catalog PA 01 – SITRANS CV - Function
  M*1	Neopentane is measured with the response factor of isopentane; for direct calibration of neopentane: see operating instructions
  M*2	Group C6+ is measured with the relative response factor of n-hexane
  M*3/CR*3	Groups C6 and C7+ are measured separately and calibrated with n-hexane and n-heptane, respectively
  M*4/CR*4	Group C6, Group C7, Group C8, Group C9 are measured and calibrated separately

  
  
  

  Table 6: Overview of device versions and available measurement configurations and the calibration gas compositions required for them

  

  SITRANS CV with SIMATIC Extension Unit

  Чертеж

  

  SITRANS CV, dimensions in mm

  Особенности

  Flexible installation: The rugged and compact design enables installation in even extreme areas of application, such as offshore exploration, or directly at the pipeline. The SITRANS CV has the certification required (such as explosion protection or splashwater protection) to meet the requirements of these applications.

  Like the MicroSAM, the SITRANS CV consists of a basic unit and an analysis module, which, if necessary, can be replaced in as short a time as possible. Combined with low power and gas consumption, this keeps operating costs down.

  Notable features of the CVControl software, which has been specially developed for calibration-related applications, includes its ease of operation and transparency.

  The automatic method optimization integrated in the software increases the repeatability of the calorific value measurement and reduces the cost of ownership.

  The serial RS 485/RS 232 and Ethernet interfaces enable communication with both the control system and a flow computer.

  Like the MicroSAM, the unit’s high analytical capability can be attributed to narrow-bore capillary columns, live injection, live switching and in-line detection.

  Технические данные

  Climatic conditions
  Permissible ambient temperature	-20 ... +55 °C (depending on oven temperature)
  Permissible storage/transport temperature	-30 ... +70 °C
  Permissible relative humidity	Max. 90%
  Protection against dust and moisture
  According to EN 60529/IEC 60529	IP 65
  According to NEMA 250	NEMA 4X
  Power supply
  Auxiliary power	24 V DC (18.5 ... 30.2 V)
  External fuse	T2.5 A
  Power consumption, typical	18 W
  Power consumption, maximum	60 W
  Dimensions and weights
  Width x depth x height	360 x 300 x 220 mm (approx. 14" x 12" x 9")
  Weight	15 kg (35 lb.)
  Mounting
  Installation on	Post, pipe or wall
  Distance from wall or next chromatograph	300 mm (12")
  Distance from ceiling or floor	200 mm (8")
  Electromagnetic compatibility
  Noise suppression	According to CISPR 11 / EN 55011 / DIN VDE 0875 Limit class B
  EMC immunity	According to IEC 60801/DIN VDE 0843
  Conducted interferences on AC supply lines
  According to Part 4 (burst)	2 kV
  According to Part 5 (ms pulses), line against line	1 kV
  According to Part 5 (ms pulses), line against ground	2 kV
  Conducted interferences on signal lines
  According to Part 4 (burst)	1 kV
  Immunity to static discharge
  According to Part 2 (ESD)	8 kV
  Immunity to fields
  According to Part 3 and Part 6	10 V/m
  Safety
  Electrical safety	IEC 61010 / DIN VDE 0411
  Explosion protection	ATEX and IEC Ex: II 2 G Ex d IIC T4 Gb Class I, Zone 1, Group IIB + H2 T4 Class I, Div 1, Groups B, C, D T4 Factory Sealed
  Oven
  Number/type	1 / isothermal
  Purging with N2	Possible
  Dimensions (D x H)	160 x 10 mm
  Max. heating power	35 VA
  Temperature range	60 … 165 °C
  Temperature stability	± 0.1 K (60 ... 165 °C)
  Temperature accuracy	± 3 K (60 ... 165 °C)
  Retention time variations per 10 °C change in ambient temperature	Approx. 0.3%
  Warm-up period from 30 … 100 °C	10 minutes
  Columns and gases
  Separating column switching	Multidimensional chromatography with backflushing and cut in live system
  Multifunctional diaphragm valve	For injection and backflushing
  Gas connections	Swagelok 1/8"
  Pressure regulators	Max. 4 single-channel electronic pressure regulators
  Solenoid valves for control of diaphragm valve	2 NC contacts, 2 NO contacts
  Carrier gas	He, Ar Notice The carrier gas defined for the delivered state must be used. Changing the carrier gas could destroy the thermal conductivity detectors.
  Gas purity (minimum requirement)	≥ 99.999 % (5.0)
  Solid components	< 0.1 μm
  Required filtration	Degree of separation 99.99 % for 0.1 μm particles
  Consumption	< 35 ml/min
  Inlet pressure	500 …700 kPa (g) 600 kPa (g) recommended Important: A continuous carrier gas supply is required for error-free operation (frequent carrier gas failure has a negative effect on the service life of the detectors and the device-internal pressure regulator). In addition, an external two-layer pressure regulator for the carrier gas pressure is strongly recommended.
  Instrument air	Not required
  Sample and injection
  Sample streams	3
  Calibration sample streams	1
  Phase	Gaseous
  Permissible sample pressure	10 … 60 kPa above atmospheric pressure NOTICE: Sample must not contain ethine (acetylene).
  Sample flow	20 … 100 ml/min
  Max. sample temperature	120°C
  Solid components	< 0.1 μm
  Required filtration	Degree of separation 99.99 % for 0.1 μm particles
  Material with which the sample comes into contact	Stainless steel, fused silica, polyimide
  Injection	"Valveless" live injection
  Controller	With multifunctional diaphragm valve
  Injection volume adjustable using switching times	From 2 ... 50 μl
  Detectors, calibration and performance data
  Detector type	TCD, max. 8 sensors
  Cell volume	0.02 µl
  Calibration	Manual or automatic, single level
  Repeatability for calorific value and density	≤ 0.01% (for natural gas)
  Accuracy for calorific value and density	≤ 0.1% (for natural gas)
  Linear range	Typically ≥ 104
  Cycle time	Application-dependent
  Ambient temperature influence	Negligible
  Mean Time to Repair/MTBF	< 1 hour / 3 years (without consumables)
  Electronics: Communication and analytical controller (CAC)
  Microprocessor	Intel 586 architecture
  Flash EPROM	128 MB
  Dynamic RAM	64 MB
  Operating system	Windows CE 5.0
  Software	Preinstalled. Modifications or upgrades for operation PC downloadable via network or locally
  Electronics: Realtime signal processor (RSP)
  Microprocessor	Motorola 68376, 20 MHz
  Flash EPROM	1 MB
  Static RAM	1 MB
  Operating system	Forth
  Software	Preinstalled. Modifications or upgrades downloadable via internal service interface
  Interfaces
  Communication	1 x Ethernet 10BaseT/TCP/IP
  Control system coupling	1 x Modbus RS 485/RS 232 RTU/ASCII
  Inputs/outputs: Basic equipment
  Digital outputs (relay contact 0.4 A/24 V DC)	4, 3 x samples, 1 x calibration
  Digital inputs (24 V to optocoupler)	4, for 1 = sample flow; 2 = time synchronization; 3 = revision (results have no effect on average values); 4 = calibration
  Status indicator
  LEDs	For: Supply voltage Software Heartbeat Ready Maintenance request alert Fault Sample flow
  LCD	For: Sample stream: S1, S2, S3, S4 Sample components: e.g. CO2, propane, etc. Measured value of sample as numeric value
  Recommended operator panel
  Personal computer	Desktop or laptop
  Processor	At least Pentium III
  Clock	≥ 800 MHz
  Interfaces	1 x Ethernet
  Operating system	Windows XP, Windows 7
  Software	CV Control version 1.30.0.0 and higher

  
  
  

  Дальнейшая информация

  Notes on 7KQ3105-..

  Support bracket

  For easy mounting, incl. support for 8 gas connections consisting of:

  • Mounting part: Dimensions 380 x 110 mm (W x H)
  • Bracket for gas connection: Dimensions 146 x 110 mm (D x H), bracket on right side, mounted at right angle

  Sample flow switchover

  The chromatograph enables automatic selection and switchover of 3 sample flows and 1 calibration flow. The DO signal from the gas chromatograph requires an external relay for the solenoid valve. The sample preparation system can be ordered separately.

  Ambient temperatures

  Particularly in warmer zones, weather protection is necessary to protect the SITRANS CV against direct solar radiation. The chromatograph is designed as standard for temperatures from -20 to +55 °C. A version in a thermostatically-controlled casing is also available as an option for temperatures outside these limits.

  Communication

  SITRANS CV has a serial interface (RS 485/RS 232) for MODBUS communication (RTU/ASCII). Modbus mapping can be flexibly used (see manual for more information).

  The operator input is by means of another separate interface via Ethernet (TCP/IP).

  Other serial and analog (4 to 20 mA) interfaces are optionally possible using an external solution package (see Article No. 7KQ2160).

  Documentation

  The documentation includes a SITRANS CV Manual and CVControl Operating Manual in English and German. The documents can be found on the enclosed CD. Safety manuals in all EU languages are also available on the CD.

  CVControl operating software

  The operating software (language: English or Russian) is included in the scope of supply. Windows XP or Windows 7 must be installed on the computer in order to install this software.

  Application

  A general system check is made of the basic unit and the integrated application module. The module and basic unit are described in the manual. In addition to the standard configuration, additional country-specific and user-specific sub-configurations are available. The performance record ex works contains the analysis check, including a repeatability record (4h test).

  The chromatograph is preconfigured; In addition, three CD-ROMS are enclosed:

  • SITRANS CV Software (including manuals and CVControl Operating Instructions)
  • Country-specific sub-setups
  • Parameter backup

  Article numbers Pos. 8_0: Applications – Standard calorific value analysis

  This application comprises the standard calorific value analysis. The chromatograph's measurement method is set at the factory, using a synthetic natural gas mixture. The performance parameters specified in Table 5 and the criteria explained in the subsequent text apply to the individual components in Table 1 and their physical variables.

  The calculation of the calorimetric variables is possible according to the following standards: ISO 6976-95, GOST, AGA 8, where the former is preset. The reference states for the combustion and for the gas volume that must be specified for calculation purposes are preset to the standard state (T_b=25 °C, T_n = 0 °C) and can be easily changed to other reference states during commissioning using the operating software (T_b= operating temperature, T_n= standard temperature).

  The CVControl software provides the energy units BTU/ft³, KWh/m³ and MJ/m³.

  Article numbers Pos. 8_1: Applications – extended calorific value analysis with oxygen

  This position includes the extended calorific value analysis of the components and possible working ranges from Table 1. Oxygen is measured in addition to the listed components (see Table 2).

  A carrier gas dry filter (article no. filter set A5E00400116) on the mounting bracket of the SITRANS CV or enclosed separately is used as standard for this measurement.

  The remarks concerning oxygen and CO in footnote 1 of Table 1 are no longer applicable to this position. The information concerning calculation and performance parameters are identical to Pos. 8_0.

  Important:

  For correct operation of SITRANS CV in accordance with Pos. 8_0 and 8_1, all measured components must be present in the calibration gas. The calibration gases listed in the table "Recommended calibration gases for Pos. 8_0 and 8_1" are recommended (also see Table 6):

  Component	Pos. 8_0 (mol%)	Pos. 8_1 (mol%)
  Oxygen		0.5
  Nitrogen	4	4
  Carbon dioxide	1.5	1.5
  Methane	88.9	88.4
  Ethane	4	4
  Propane	1	1
  Isobutane	0.2	0.2
  n-butane	0.2	0.2
  Neopentane	0.05	0.05
  Isopentane	0.05	0.05
  n-pentane	0.05	0.05
  n-hexane	0.05	0.05

  
  
  

  Table 7: Recommended calibration gases for Pos. 8_0 and 8_1

  A summary of the various country-specific setups, i.e. standard settings including measured components and calibration gases, can be found on the parameter backup CD in the "Readme.pdf" document.

  Article numbers Pos. 8_2: Applications – Calorific analysis with biomethane

  This position contains the analysis of the components and working ranges of the biomethane listed in Table 3. Based on the measured concentrations of the components, the quality parameters – such as heating values – are determined in accordance with the international standards ISO, GOST and AGA analogously to positions 8_0 and 8_1.

  Article No. Position 8_3: Applications – Calorific value analysis with backflush summation

  This position includes the analysis of the components listed in Table 4, in which case the components starting from C6, including the isomers, are regarded as the sum peak. This variant is especially well suited for natural gases with very low content of higher hydrocarbons, especially C6+.

  However, this backflush summation can also be used to effectively analyze natural gas with typical C6+ fractions. The components up to and including C6+ can be analyzed within the possible concentration ranges according to Table 4.

  A01 – SITRANS CV for calorific value analysis Position 8_0, 8_1, 8_2 and 8_3 - Russian configuration

  This position includes the possibility for ordering SITRANS CV with a Russian Ex certificate.

  IMPORTANT: This Russian version results in a change in the nomenclature from SITRANS CV to MicroSAM.

  The following also applies to Pos. 8_3: The limits listed in GOST Standard 31371.7-2008 are checked during the inspection and supplied with the device documentation.

  B02- SITRANS CV with extended measuring range in combination with Pos. 8_0

  This position permits separate measurement of the group isomers of the higher hydrocarbons C6 to C7(+) and C6 to C9 (+). In accordance with the designation C7(+) and C9 (+), a detailed measurement is carried out up to and including n-C9.

  Important:

  Testing and certification of the SITRANS CV is carried out using the standard calorific value analysis in accordance with Pos. 8_0. If Pos. D02 or D03 has been selected, this does not include repetition of the proof of repeatability (4 h test) of the unit during the factory acceptance.

  The following calibration gases are essential for operation of the SITRANS CV including these extended measuring ranges:

  Required components	Calibration gas for C6 and C7(+) measurement (mol%)	Calibration gas for C6 and C9(+) measurement (mol%)
  Nitrogen	4.00	4.00
  Carbon dioxide	1.50	1.50
  Methane	89.00	89.00
  Ethane	4.00	4.00
  Propane	1.00	1.00
  Isobutane	0.20	0.20
  n-butane	0.20	0.20
  Neopentane	0.10	0.10
  Isopentane	0.05	0.05
  n-pentane	0.05	0.05
  n-hexane	0.05	0.05
  n-heptane	0.05	0.05
  n-octane		0.50
  n-nonane		0.50

  
  
  

  Table 8: Components and concentrations of the calibration gases for the extended measuring ranges

  More detailed information regarding startup of SITRANS CV including C7(+) and C9(+) measurement can be found in the manual and on the enclosed document CD (country-specific setup "Readme.pdf" file)

  D01 - Acceptance and customer information - Factory acceptance, visual check, 1 day

  The scope of supply is checked and the documentation and operation of the unit explained as part of the factory acceptance process. The factory acceptance does not include repetition of the proof of repeatability (4 h test) of the unit.

  D02 - Acceptance and customer information - Factory acceptance with performance record, 1 day

  The scope of the tests to be carried out is described in Table 9 "Scope of tests during factory acceptance". When ordering D02, please supplement the desired option from E0x.

  Record of component isolation	Through a final check of existing documentation and according to current chromatograms, 5 analyses
  Stability test (repeatability)	According to order E01 ... E03 Performance criteria according to Table 3ff.
  Checking the Modbus connection	Checking or simulation of Modbus communication can be carried out using a flow computer provided by the customer, for example.
  Calculation test	Comparison of the values calculated by CVControl with a customer comparison procedure (optional)
  Auto-calibration function Auto-optimization of method	The two functions are explained theoretically and practically during presentation of CVControl.
  Alarm and event messages	Simulation of alarm situations; as per customer requirement

  
  
  

  Table 9: Scope of test during factory acceptance

  SITRANS CV is a standard product. Only in this manner is it possible to guarantee short delivery times and attractive prices. All performance records required retrospectively require higher overhead. However, will will be happy to come to an agreement regarding implementation.

  D03 - Acceptance and customer information - Factory acceptance, each additional day

  Only in conjunction with D01 or D02

  E0x - Repeatability test

  Proof of repeatability over a period of 4 h is included as standard. Longer repeatability records for the unit can be ordered by means of the supplementary item E0x.

  E01 to E03 - Repeatability test, 8 h – 24 h – 48 h

  Only in conjunction with D02

  Linearity tests can be carried out in the factory on request. The standard test gases required for this (Table 10: "Recommended calibration gases for linearity test during acceptance") are provided free of charge. If the customer specifies other calibration gases with different compositions or higher uncertainty requirements, they must provide these gases for acceptance purposes. As an option, Siemens can procure these special calibration gases (subject to a charge).

  On request, proof of the complete functionality of the SITRANS CV is possible within the certified temperature and ambient conditions.

  Component	Gas #1 (Mol.%)	Gas #2 (Mol.%)	Gas #3 (Mol.%)
  Methane	Residual (approximately 75)	Residual (approximately 85)	Residual (approximately 96.5)
  Nitrogen	15.5	5	2.5
  Carbon dioxide	0.5	2	0.1
  Oxygen	0.5	2	4
  Ethane	8	4	0.5
  Propane	0.5	2	0.15
  i-butane	0.15	0.5	0.03
  n-butane	0.15	0.5	0.03
  Neopentane	0.08	0.3	0.03
  i-pentane	0.08	0.3	0.03
  n-pentane	0.08	0.3	0.03
  Hexane	0.05	0.1	0.015

  
  
  

  Table 10: Recommended calibration gases for linearity test during acceptance

  The calibration gases have the following uncertainties:

  Proportions of component materials (Mol.%)	Uncertainty (or smaller)
  0.1 ... 0.25	± 5.00 %
  0.25 ... 1	± 1.00 %
  1 ... 10	± 0.50 %
  10 ... 100	± 0.20 %

  
  
  

  Table 11: Uncertainties of calibration gases

  Notes on 7KQ2160-..

  Analog and serial data transmission

  SITRANS CV does not provide internal analog outputs. These properties can be provided by the SIMATIC Extension Unit. This uses the Modbus output of the chromatograph in order to generate up to 8 active analog outputs (standard, more analog outputs on request).

  Modbus multiplexers are available in addition, and allow up to 2 Modbus masters to be connected to the SITRANS CV. The distance from the SITRANS CV should not be more than 1 200 m. In the case of an installation without enclosure (without explosion protection), we deliver the components for generation of analog outputs mounted on a rail, otherwise in the Ex d enclosure.

  Pos. 08_ 0 - 5 – Analog values via external unit

  This position includes:

  • Mounting rail
  • Power supply
  • SIMATIC S 7-300 and SIMATIC S7, Micro Memory Card 3.3 V NFLASH, 64 KB
  • Analog output module with terminating connector
  • Protocol converter

  Pos. 09_ A – C: Modbus multiplexer

  (only applicable together with 0-4)

  The Modbus signal can be routed using the Modbus multiplexer and connected to two Modbus masters. B specifies supply of the components without CE certificate.

  Pos. 10_ A - B: Enclosure

  This position includes the option for installation of the SIMATIC extension unit in the hazardous area (Zone 1 and Zone 2). A protective casing Ex d with standard cable glands including the modules required for the analog outputs and the Modbus multiplexer (if applicable) are provided for this purpose.