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«Maxum II FID-Flammen-Überwachung / Automatische Zündung Zusammenfassung Erste Möglichkeit den Status der Flamme am Maxum II 302A FID zu ...»

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Automation & Drives

Technical Support Information No. 101

Revision 6.0 December 2006

A&D Sensors and Communication - Process Analytics - Karlsruhe Germany Page 1 of 17

Maxum II FID-Flammen-Überwachung / Automatische Zündung

Zusammenfassung

Erste Möglichkeit den Status der Flamme am Maxum II 302A FID zu überwachen erfolgt mittels eines künstlich

erzeugten Peaks.

Dieser wird generiert, indem kurzzeitig der Brenngas- bzw. Wasserstoff-Trägergas-Fluss zum FID geändert wird.

Der so generierte „Flammen-Indikator“-Peak wird über EZChrom eingebunden und auf 100 % kalibriert.

Die Flammenüberwachung erfolgt über einen festgelegten unteren Grenzwert von 10%. Die Zündungs-Sequenz wird ausgelöst sobald dieser Wert unterschritten wird. Der Status der Flamme ist in Ordnung wenn der Wert grösser bleibt. Ist die Flamme erloschen, so wird ein Alarm generiert und die automatische Zündung des FID ausgelöst.

Eine zweite Möglichkeit besteht darin, das Abgleich-Signal des FID-Detektors zur Zündung heranzuziehen.

Vorteilhaft, wenn LIVE-Schaltungen eingesetzt werden.

FID Flame Detection / Auto-Ignition on Maxum II The first possibility to monitor the status of the flame in the Maxum II 302A flame Ionization detector (FID) is determined by monitoring an artificial peak, X_FID_Flame_Indicator (X = Detector Location; L = Left, C = Center, R = Right). This peak is created by temporarily changing the hydrogen flame fuel or hydrogen carrier flow to the FID. The Flame Indicator peak is integrated in the standard fashion using the EZChrom software package.

The Flame Indicator peak has an associated low limit used to determine the status of the flame. The re-ignition sequence is triggered any time the value of the Flame Indicator peak falls below a minimum preset value. The flame status is normal when the Flame Indicator peak exceeds the minimum value. If the flame is extinguished a user alarm will be generated and the software will attempt to re-ignite the detector flame. The flame out alarm and the ignition sequence are triggered once a cycle when the Flame Indicator peak value falls below the minimum. Below is a typical Flame Indicator configuration for a FID in the right detector position.

The second alternative is to monitor the balance signal of the FID. Beneficial if LIVE-switching is used.

© SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.

Der Inhalt dieser TSI wurde auf Übereinstimmung mit der beschriebenen Hard- und Software geprüft, dennoch können Abweichungen nicht ausgeschlossen werden. Technische Änderungen vorbehalten.

–  –  –

Use the following steps when configuring the Flame Indicator peak:

1. Select the gas to alter. These are listed in order of most favorable to least favorable.

• Hydrogen flame fuel.

• Hydrogen carrier.

2. Temporarily increase the pressure 20-50% above the normal operating pressure for 1-5 seconds. Pressure change and duration should be sufficient to meet the requirements of item 3.

3. The minimum peak height of the Flame Indicator peak should be approximately 0.005 volts.

EZChrom Peak/Group Table:

Calibrated Range should be selected in the Group Type and the peak start / stop times should be entered in the Group Def field. The Quantitate field should be set to Height and enter 100 in Level 1 calibration field. The Units field should not have en entry.

System Manager Result Table:

A Flame Indicator result must be created for each process and validation stream with the appropriate limitapp & limitref selection. Flame status is not monitored on the calibration streams.

System Manager Limit Table:

Limit ID 923 shows typical setting for the Flame Indicator record. Any value below the lovalue triggers alarm handler 923. The low value is factory set at 10 (no units).

© SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.

Der Inhalt dieser TSI wurde auf Übereinstimmung mit der beschriebenen Hard- und Software geprüft, dennoch können Abweichungen nicht ausgeschlossen werden. Technische Änderungen vorbehalten.

–  –  –

System Manager Alarmhandler Table:

Alarm code 923 issues a flame out alarm and triggers digital output 230 (R_FID Man Ignite) to re-ignite the FID flame.

Note: In case you have to use the temperature-dependent FID-ignition procedure simultaneously, modify the

alarmhandler table like this:

Check Technical Support Information TSI No. 96 for more details regarding the implementation of temperature dependent FID-ignition!

Because of the disabled FID_Man_Ignite-DO you have to run MaxBasic programs for enabling it:

© SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.

Der Inhalt dieser TSI wurde auf Übereinstimmung mit der beschriebenen Hard- und Software geprüft, dennoch können Abweichungen nicht ausgeschlossen werden. Technische Änderungen vorbehalten.





–  –  –

System Manager Application DO Table:

System Manager Sys_DO Table:

The pulse_duration is set to 45.000.000 µs (45 seconds) and the pulse_polarity_neg is set to zero.

This last setting is very important, else the FID won’t ignite! You have to upgrade the database at least to version 4.0 since the pulse_duration is not implemented in version less than 4.0.

© SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.

Der Inhalt dieser TSI wurde auf Übereinstimmung mit der beschriebenen Hard- und Software geprüft, dennoch können Abweichungen nicht ausgeschlossen werden. Technische Änderungen vorbehalten.

–  –  –

2. Monitoring the FID Balance Signal There are two versions available. The first version is necessary, if an EPC is regulating combustion air.

The second version is needed if a manual pressure regulator is used to adjust combustion air.

The needed MaxBasic programs and the appropriate database textfiles can be found at the SIEMENS Intranet Service Support site.

First version: electronic pressure regulator (EPC) is regulating combustion air

System Manager Limit Table:

Limit ID 923 shows the setting for the balance monitoring record. Any value below the lovalue triggers Alarmhandler 923. Any value above the hivalue triggers Alarmhandler 924. The value is factory set at 6 %.

Limit ID 990 is monitoring the temperature dependent ignition of the FID. Any value below the lovalue triggers Alarmhandler/Program 991. Any value above the hivalue triggers Alarmhandler/Program 990. The value is factory set at 145 to149 °C. Check TSI #96 for more informations!

© SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.

Der Inhalt dieser TSI wurde auf Übereinstimmung mit der beschriebenen Hard- und Software geprüft, dennoch können Abweichungen nicht ausgeschlossen werden. Technische Änderungen vorbehalten.

–  –  –

System Manager Alarmhandler Table:

Alarm code 923 issues a flame out alarm on R_FID and triggers digital output 800 (R_FID OUT) to re-ignite the R_FID flame by triggering the hivalue Limit ID 991.

Alarm code 924 issues a ‘R_FID Flame On’-message and switches off digital output 800 (L_FID OUT).

Instead of implementing a MaxBasic program in the programid entry to ignite the FID’s like for the temperature dependent-ignition, we switch one DO. Advantage: it is possible to ignite the FID’s manually!

Thus it can be avoided to try to ignite continously (in RUN or in HOLD it’s no odds) while monitoring the AIbalance-signal if there is no FID gas supply available/topped.

© SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.

Der Inhalt dieser TSI wurde auf Übereinstimmung mit der beschriebenen Hard- und Software geprüft, dennoch können Abweichungen nicht ausgeschlossen werden. Technische Änderungen vorbehalten.

–  –  –

It’s necessary to implement a DUMMY DO in the SYS_DO Table:

Program ID 990 is enabling and switching the R_FID Ignite-DO and afterwards disabling the DO and the program itself. Program ID 991 enables program 990.

System Manager Program Table:

System Manager Parameter Table:

Parameter ID 992 indicates the AO ID of the EPC for the R_FID Air supply while parameter ID 993 identifies the EPC setpoint. Important Note: Always check if the ID’s and setpoint settings match with the recent application!

© SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.

Der Inhalt dieser TSI wurde auf Übereinstimmung mit der beschriebenen Hard- und Software geprüft, dennoch können Abweichungen nicht ausgeschlossen werden. Technische Änderungen vorbehalten.

–  –  –

System Manager Sys_DO Table:

The pulse_duration is set to 45.000.000 µs (45 seconds) and the pulse_polarity_neg is set to zero.

This option is very important, else the FID won’t ignite! You have to upgrade the database at least to version

4.0 since the pulse_duration is not implemented in version less than 4.0.

Additional Note: If the application is working in LOW sensitivity (FID Lo-Gain ON) you need to balance the FID twice via the EZChrom method: in the HIGH range and in the LOW range to get valid balance values.

Example:

© SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.

Der Inhalt dieser TSI wurde auf Übereinstimmung mit der beschriebenen Hard- und Software geprüft, dennoch können Abweichungen nicht ausgeschlossen werden. Technische Änderungen vorbehalten.

–  –  –

The appropriate Max-Basic programs:

FID_Ignite_Control.bas Sub main() '============================================================================== 'Function: Disables the DO for any funktion 'input parameter 'Revision History Name Date Comments '1.0 USpi 11/20/03 Rewritten for 4.0 ' Modified W.Schr. 19.12.2003 (iArg1 added) ' Modified A.Fritz 25.07.2005 Erase Disable DO ' 'Arguments: iArg0 - id of appdo man ignite ' iArg1 - id of FID_Ignite program ' iArg2 - id of intFIDAirApp_AO ' rArg0 - dblIgnitionPressure '============================================================================== Dim tblDO As Table Dim sql As String Dim strSQL As String Dim n As Long Dim dblIgnitionPressure As Double Dim intFIDAirApp_AO_id As Integer '==============================================================================

'SET CONSTANTS

intFIDAirApp_AO_id = iArg2 dblIgnitionPressure = rArg0 '===============================================================================

'SET THE FID_AIR SET POINT TO THE IGNITION PRESSURE

strSQL = strSQL & "; Update appao Set value = " & Str$(dblIgnitionPressure) strSQL = strSQL & " Where application_id = " & Appl strSQL = strSQL & " And id = " & intFIDAirApp_AO_id strSQL = strSQL & "; Send 'forcewrite' To appao" strSQL = strSQL & " Where application_id = " & Appl strSQL = strSQL & " And id = " & intFIDAirApp_AO_id n = db.ExecuteSQL(strSQL) '============================================================================== © SIEMENS AG Karlsruhe - A&D SC PA AS 2 - Niko Benas +49 721 595 7216 - niko.benas@siemens.com Als Betriebsgeheimnis anvertraut. Alle Rechte vorbehalten.



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