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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 two serial interfaces. One RS 485 / RS 232 connection for Modbus communication (RTU / ASCII). Modbus mapping can be flexibly used (see manual for more information). SITRANS CV is operated via the second interface Ethernet (TCP/IP).
Other serial and analog (4 to 20 mA) interfaces are available as an option; these can be ordered as a supplementary solution package.
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.
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 original master setup as the standard method, other country or user-specific method setups are available. The performance record ex works contains the analysis check, including a repeatability record (4h test).
The standard method (original master setup) is installed in the chromatograph, and four CD-ROMs are supplied with the following:
- 2 CDs SITRANS CV Software (including manuals and CVControl Operating Manual)
- 1 CD Country-specific partial setups
- 1 CD Parameter backup for SITRANS CV (including documentation for the individual module with TCD bridge voltages and EPC pressures, as well as module-specific hardware setups)
Order No. Pos. 8_0: Applications – Standard calorific value analysis - Certified in conjunction with GWK-CHRPA-CV-CER-1
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 3 and the criteria explained in the subsequent text apply to the individual components in Table 1 and their physical variables.
Calculation of the calorimetric variables is based on GOST, AGA 8 and ISO 6976-95 with the last-named as the default. The reference states for the combustion and for the gas volume that must be specified for calculation purposes are preset to the default state (Tb= 25 °C, Tn = 0 °C) and can be easily changed to other reference states during commissioning using the operating software (Tb = operating temperature, Tn = standard temperature).
The CVControl software provides the energy units BTU/ft3, KWh/m3 and MJ/m3.
Order No. 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 (Order 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 Table "Recommended calibration gases for Pos. 8_0 and 8_1" are recommended:
|
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 |
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.
A01 – SITRANS CV for calorific value analysis Pos. 8_0 and Pos. 8_1 - 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.
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 |
Calibration gas for C6 and C9(+) measurement |
|---|---|---|
|
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 |
Components and concentrations of the calibration gases for the extended measuring ranges
Further 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 the Table "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 |
|
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 |
The two functions are explained theoretically and practically during presentation of CVControl. |
|
Alarm and event messages |
Simulation of alarm situations; as per customer requirement |
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 calibration gases required for this (Table "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 |
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 % |
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.