Siemens QGO21 Series Bedienerhandbuch

CC1P7845en

06.12.2017 Building Technologies Division

QGO21.000Dx7

Oxygen Sensor QGO21...

Basic Documentation

The QGO21 and this Basic Documentation are intended for use by OEMs which

integrate the oxygen sensor in their products!

Note!

The QGO21 may only be operated with the following system components:

Type

AZL52…

LMV52.2…

LMV52.4…

PLL52…

from software version

04.90

05.00

10.10

01.50

QGO21 must be selected as the O2 sensor in the O2 module.

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Weishaupt 06.12.2017

Supplementary documentation

Basic Documentation LMV5....................................................................................P7550

User Manual LMV52 ...............................................................................................A7552

Mounting Instruction QGO21. ........................................................M7845 (4 319 0866 0)

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Contents 06.12.2017

Contents

Supplementary documentation........................................................................................2

1Safety notes.....................................................................................................4

1.1Warning notes .................................................................................................4

1.2Engineering notes............................................................................................6

1.3Installation and mounting notes.......................................................................6

1.4Electrical connection........................................................................................7

1.5Commissioning notes......................................................................................8

1.6Standards and certificates.............................................................................10

1.7Service notes.................................................................................................10

1.8Disposal notes...............................................................................................11

2Overview........................................................................................................12

3Assortment connections................................................................................13

4Technical data...............................................................................................14

5Description of functions.................................................................................15

5.1Functioning principle of the measuring cell ...................................................15

5.2Impact of the cell’s temperature ....................................................................17

5.3Impact of the reference gas...........................................................................18

5.4Switching on and switching off ......................................................................18

5.5Aging .............................................................................................................18

6Mechanical design of the sensor...................................................................19

7Mounting and connecting the sensor.............................................................20

7.1Mounting........................................................................................................20

7.2Connection ....................................................................................................21

8Connection diagram ......................................................................................22

9Dimensions....................................................................................................23

10Comparison table ..........................................................................................24

11List of figures.................................................................................................25

12Index..............................................................................................................26

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1 Safety notes 06.12.2017

1 Safety notes

1.1 Warning notes

To avoid injury to persons, damage to property or the environment, the following

warning notes must be observed!

It is not permitted to open the sensor incorrectly, interfere with or make changes

to the sensor!

All activities (mounting, installation, service, etc.) must be performed by qualified

staff

Before making any wiring changes in the connection area, completely isolate the

plant from mains supply (all-polar disconnection). Ensure that the plant cannot be

inadvertently switched on again and that it is indeed dead. If not observed, there is

a risk of electric shock hazard

Ensure protection against electric shock hazard by providing adequate protection

for the connection terminals

During operation, the sensor’s connecting head must be kept closed; all 3 screws

must be securely tightened

Each time work has been carried out (mounting, installation, service work, etc.);

check to ensure that wiring of connected lines is in an orderly state and make the

safety checks as described in Commissioning notes. Keep cables away from

extremely hot plant equipment or sensor parts

During burner operation, QGO21 must be kept on operating temperature via

associated control unit (LMV52 with PLL52)

Always keep the sinter filter free from dirt, this extended the response time of the

sensor

The maintenance timer of LMV52 must be used to ensure that the maintenance

interval is complied with (see LMV52 User Documentation A7552)

All setting instructions of the LMV52... must be observed (see User Documentation

A7552, chapter O2 control). In particular, we wish to draw your attention to the

manipulated variable limitation that is described there.

The environment must be free from chemicals such as vapors from solvents

Before cleaning the sinter filter, allow the QGO21 to cool down for at least 1 hour.

When using compressed air for cooling (only after the sensor has completely

cooled down), pressures up to 0.5 bar are permitted. If this is not observed, the

sensor can be damaged in a way that inadmissibly high CO levels in the flue gases

can occur

Caution - risk of explosion!

Check that the sintered filter is seated correctly, has been screwed tightly in

place, and inspect the sensor for damage.

If sensors are damaged or not tightly fitted, or if sintered filters are not present,

this may lead to the loss of the flame arrester.

Warning!

The QGO21 must be maintained regularly.

The OEM and the heating engineer are obliged to:

set a maintenance interval suitable for the system and

to carry out the maintenance outlined in the QGO21 Basic Documentation

(P7845), chapter Maintenance instructions.

Fall or shock can adversely affect the safety functions and lead to dangerous

conditions. Such sensors must not be put into operation, even if the measuring cell

does not exhibit any damage

Ensure that air cannot enter the space between burner and measuring parts. In

particular, the mounting flange must be completely gas-tight

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1 Safety notes 06.12.2017

The sensor must always be installed so that the connecting part (head to the

flange) remains free and that unimpeded air exchange through the reference air

slots is guaranteed. Otherwise, there is a risk of false measurements, which can

lead to dangerous conditions

Ensure that the hot QGO21 does not get into contact with explosive or inflammable

gases

QGO21 may only be used in conjunction with AGO21

Caution - risk of burns!

There is a risk of burning since the measuring cell works at an operating

temperature of 700 °C and other accessible parts can get very hot too (>60 °C)

To prevent injury caused by the hot sensor tube, remove the QGO21 from the

AGO21 mounting flange only after the equipment has cooled down

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1 Safety notes 06.12.2017

1.2 Engineering notes

If the burner is shut down for no more than 1 or 2 days, do not switch off the

QGO21 and the associated control unit (LMV52 with PLL52)

To ensure a good response, always use the QGO21 together with the AGO21

Flue gas temperatures at the QGO21 must not exceed 300 °C, since higher

temperatures can destroy the sensor

QGO21 may only be used with the approved fuels, as other fuels can destroy the

sensor with their aggressive components (see Technical data)

Heavy metals in the fuel, such as lead, cadmium etc., destroy the sensor element

and therefore may not be contained

Silicones and silicone vapors in the flue gas can damage the sensor element and

therefore may not be contained

Following element in the flue gas reduces the life cycle of the sensor elements and

should not be contained:

Silicon, sulfur, phosphor, boric, bismuth, copper and halogens (F, CI, Br, I) and

their compounds (e.g. FCKW)

NOx, SOx and reducing atmospheres, such as CO by an incomplete burning,

impair the life time of the sensor element depending on the concentration and the

influence time

1.3 Installation and mounting notes

Ensure that the relevant national safety regulations are complied with

The flue gas flow passing the measuring point should be homogeneous. When

mounted too close to air dampers or pipe bends, faulty measurements can occur

The exchange of fresh air in the connection area of the sensor with the reference

air slots must be ensured and may never be covered up (by insulation or similar)

The sensor should not be exposed to aggressive gases (NOx, etc.). This applies to

both the gas and air side since aggressive gases can drastically shorten the

sensor’s life

Disturbances can distort the measurements (this can lead to dangerous conditions in

connection with O2 trim control):

– If flueways are not tight, false air can join the flue gases. In that case, the oxygen

content acquired by the sensor is above the real content

– When flue gas velocities are low, the sensor will respond more slowly since the flue

gases need more time to pass the measuring cell

– The further the sensor is mounted from the flame, the longer the dead time

For expected ambient temperatures between 50 °C and 70 °C, the connecting wires

between the terminals Q4 or Q5 and the Pg screw connection must also be insulated

with the high-temperature bushings provided

Note

For detailed information on mounting, refer to Mounting Instructions M7845

(74 319 0866 0).

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1 Safety notes 06.12.2017

1.4 Electrical connection

It is important to achieve practically disturbance- and loss-free signal transmission:

Never run the sensor cable together with other cables; use a separate cable

Observe the permissible length of the sensor cables and the relevant specification

(see Technical data)

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1 Safety notes 06.12.2017

1.5 Commissioning notes

To prevent the collection of condensate inside the QGO21, do not put the burner

into operation before the sensor’s heating up phase is completed

During the sensor’s heating up phase, temperature differences between the inner and

outer electrode generate thermo-electric voltages which, in that phase, falsify the

acquired oxygen value.

When commissioning the control system, the heating up times must therefore be

observed.

It is also recommended to keep the sensor activated during short burner off periods

(2 days).

Prior to commissioning, make the following mounting final checks:

-Check to ensure that the sensor is correctly fitted to the mounting flange

-Ensure that the signal and power supply lines are correctly connected

Electronic circuit

-Activate the electronic circuit (LMV52, PLL52)

-Wait until the sensor has reached its normal operating temperature, the residual

oxygen content is displayed on the associated control unit (LMV52 with PLL52) and

has stabilized. For more details, refer to the Basic Documentation of the associated

control unit (LMV52 with PLL52)

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1 Safety notes 06.12.2017

After the final mounting check, a first functional check can be made:

Before commissioning for the first time or after replacing the QGO21, the QGO21 must

be checked for temporary O2 measured value distortion.

The QGO21 must measure the O2 value with sufficient accuracy before an O2 setpoint

curve is set.

Humidity deposits in the QGO21 can lead to O2 measured value distortion. In the first

few hours after the QGO21 is switched on, the O2 measured values may be distorted,

resulting in the values being too low.

Example: 4.1% O2 content may be shown instead of 5%.

The following measures must be implemented to prevent distorted O2 measurements:

1. Operate the QGO21 continuously on the system under voltage for at least 8 hours

with the sensor heating switched on.

2. Then operate the burner in pre-ventilation phase for 15 minutes and observe the

O2 measured value until a value between 19.5% and 21% is measured. If this has

still not happened after 15 minutes in pre-ventilation phase, there is a temporary

O2 measured value distortion. The O2 setpoint curve must not be set.

New QGO21 devices must be pre-heated for up to 12 hours longer before no

temporary O2 measured value distortion occurs and a relevant O2 value is

achieved in the pre-ventilation phase.

Older QGO21 devices must be replaced or cleaned if the relevant O2 value is not

achieved in the pre-ventilation phase within the specified time frame.

Note!

Important point to remember for urea injection and other sources of humidity:

Humidity reduces the O2 value in the flue gas.

Example: If an O2 setpoint curve is set when a humidity source is active, the O2

control can reduce the air more than desired during normal operation if the humidity

source stops working at a later stage. Sufficient oxygen reserves must be taken into

account in the O2 setpoint curve for this eventuality.

It is also possible to make a functional check of the QGO21 based on a comparative

measurement.

Comparative measurement means that, during burner operation, the actual oxygen

value is measured with a flue gas analyzer and will then be compared with the value

acquired by the QGO21.

Note

Flue gas analyzers measure «dry», the QGO21 measures wet.

The conversion is made with the help of the conversion table contained in the

Addendum to this Basic Documentation.

Functional check

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1 Safety notes 06.12.2017

1.6 Standards and certificates

Note!

Only in connection with LMV52 with PLL52!

EAC Conformity mark (Eurasian Conformity mark)

ISO 9001:2015

ISO 14001:2015

OHSAS 18001:2007

China RoHS

Hazardous substances table:

http://www.siemens.com/download?A6V10883536

1.7 Service notes

After no more than 3 months of operation following commissioning, check the sensor’s

internal resistance. If it exceeds 30 , shorter the service interval to 3 months. Sensors

having an internal resistance of >100 should no longer be used for control tasks

since their response is too slow. For this reason, to ensure proper functioning, sensors

with a resistance of >100 should be replaced.

Make certain that the sensor’s sinter filter is always kept free from dirt

Regularly inspect the sintered filter of the QGO21 for contamination. The inspection

intervals and the value for the LMV52 maintenance timer are based on the level of

contamination observed.

The recommended value for the first maintenance timer setting is 3 months.

The final value can then be set at a later stage based on the level of contamination

observed.

The following maintenance work must be carried out if contamination is identified:

- A cooling time of at least 2 hours must be observed.

- Clean the sintered filter using a brass wire brush or compressed air

or replace the sintered filter (sintered filter for service AGO742870012.

The sintered filter must not become damaged during cleaning. If the sintered filter

becomes damaged or cannot be cleaned, it must be replaced. The replaced

sintered filter must not be used again.

The grid of the inlet and outlet orifices must not be damaged at cleaning. If grid is

damaged or the sensor cannot be cleaned completely, the sensor must be

replaced. The replaced sensor must not be used again

Check flange gasket on each service visit and replace if necessary

After cleaning and heating up, check oxygen measurement in the burner’s entire

working range

The QGO21 must not come into contact with water.

The maintenance timer in the LMV52 must be reset once the maintenance work is

complete

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