Siemens CALOMAT 6, 6 Series, CALOMAT 6F, ULTRAMAT 6, OXYMAT 6 Additional Equipment Manual

Additional Equipment Manual release 07/2002

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ULTRAMAT/OXYMAT/CALOMAT 6
Gas analyzers of category II 2 G for use in
potentially hazardous areas of zone 1

as anal

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CALOMAT 6, OXYMAT 6, ULTRAMAT 6

Gas analyzers of category II 2 G for use in
in hazardous areas of zone 1

Additional Equipment Manual

A5E00058873-02
Release 07/2002

The reproduction, transmissi

on or use of this document or its

ULTRAMAT, OXYMAT, CALOMAT, SIPAN

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Order No. A5E00058873
Printed in Germany
AG 0702 En 0.05 20 AB

English

Contents

Notes E-2

1. Description E-3

1.1 Application range E-3

1.2 External explosion protection E-3

1.2.1 Pre-purging phase E-3

1.2.2 Operating phase E-3

1.3 Internal explosion protection E-3

1.4 Further safety measures E-4

1.4.1 Analyzer versions EEx p with
"Compensation of losses resulting from leaks" E-4

1.4.2 Analyzer versions EEx p with "Continuous purging" E-4

2. Technical specifications E-5

2.1 Installation site E-5

2.2 Explosion protection E-5

2.3 Sample gas input conditions E-5

2.4 Pneumatic data of the protective gas E-6

2.5 EEx p safety device E-6

2.6 Differential pressure monitoring E-7

2.7 Accessories E-7

3. Assembly Guidelines E-8

3.1 Connection of sample gas and protective gas E-8

3.2 Assembly diagram for the versions EEx p with "Compensation of losses
resulting from leaks" E-9

3.3 Assembly diagram for the versions EEx p with "Continuous purging" E-10

3.4 Electric connections E-11

3.5 Inputs and outputs E-11

4. Commissioning E-12

4.1 Connection to the EEx p safety device E-12

4.2 Pressure correction E-12

4.3 Key switch E-12

5. Additional equipment E-13

6. Maintenance E-13

6.1 Leak testing of containment system (sample gas path) E-13

6.1.1 Recommended test setup for CALOMAT 6F and OXYMAT 6F E-13

6.1.2 Recommended test setup for ULTRAMAT 6F E-14

6.1.3 Carrying out the leak test E-14

6.2 EEx p safety device E-15

6.3 Analyzers and additional equipment E-15

6.4 Spare parts E-15

Appendix A-1

English

Notes

This manual only deals with the components of the CALOMAT 6F (C 6F), OXYMAT 6F (O 6F) and
ULTRAMAT 6F (U 6F) gas analyzers with respect to explosion protection in connection with an EEx p
safety device. In addition to this manual, the manuals of all devices necessary for operating the
system must be observed.

The associated "Special conditions" described in the EC-type examination certificates

PTB 00 ATEX 2022 X and TÜV 01 ATEX 1708 X

enclosed in the Appendix must be observed without fail.

These describe

- the application ranges,

- the minimum requirements for an EEx p monitoring device and

- other precautionary measures which are important for operation.

The technical specifications in this manual may be different to those in the associated manuals for the
analyzers and additional equipment under some circumstances. The technical specifications listed in
this manual are valid in such cases.

To achieve perfect, reliable operation of the analyzers and additional equipment, they may only be
used in the manner described by the manufacturers. In addition, perfect and safe use of these
products is conditional upon proper transport, storage and installation as well as careful operation and
maintenance.

This manual has been written for technically qualified personnel. Familiarity with and technically
correct application of the safety instructions and warnings described in this manual are prerequisites
for safe installation and commissioning. Only qualified personnel have the necessary professional
knowledge to be able to interpret the general safety information and warnings correctly in individual
cases and to put them into practice.

This manual is an essential part of the scope of delivery. For reasons of clarity it does not contain all
details on all versions of the described products and cannot cover every situation which could
conceivably arise during installation, operation, maintenance and use in systems. If you require further
information, or if problems arise which are not dealt with in sufficient detail in this document, please
request the desired information from your local or responsible Siemens branch.

E-2 Additional Equipment Manual EEx p

Order No.:

A5E 000 58873-02

English

1. Description

1.1 Application range

The C 6F, O 6F and U 6F analyzers are used to measure individual components in gas mixtures. In
conjunction with a certified EEx p safety device guaranteeing the pressurized enclosure, these
analyzers can be used in hazardous areas of zone 1. The EEx p safety device guarantees defined
pre-purging in the housing, and also the required pressurized enclosure during operation.
Two alternatives are possible for the pressurized enclosure EEx p, and can be considered as
equivalent:

- Pressurized enclosure EEx p with "Compensation of losses resulting from leaks" and

- Pressurized enclosure EEx p with "Continuous purging".

The analyzer version can be recognized by the bold printed digit in the Order No.:

Pressurized enclosure EEx p

CALOMAT 6F 7MB251x–xxx0x–xAEx

OXYMAT 6F 7MB201x–xxxxx–2or3xxx 7MB201x–xxxxx–6or7xxx

ULTRAMAT 6F 7MB211x–xxxxx–2or3xxx 7MB211x–xxxxx–6or7xxx

With "Compensation of losses

resulting from leaks"

With "Continuous purging"

7MB251x–xxx0x–xAFx

1.2 External explosion protection

The "External explosion protection" serves to prevent penetration of explosive gas mixtures (gas
damp) into the housing or ignition on the surface. For this reason, the analyzer is purged with
protective gas, and the control panel operated via an intrinsically-safe isolating component.

1.2.1 Pre-purging phase

The pre-purging phase serves to displace any combustible gases present prior to switching on the
analyzer. During this time (5 min), the housing is purged with 5 times its own volume.

1.2.2 Operating phase

The pre-purging phase is followed by the operating phase:

- In EEx p mode with "Compensation of losses resulting from leaks", only that volume of

protective gas required to hold an overpressure of ≥≥≥≥ 50 Pa compared to atmospheric and the sample
gas is added.

- In EEx p mode with "Continuous purging", the protective gas flows through the housing at

≥≥≥≥ 1 l/min. An overpressure of ≥≥≥≥ 50 Pa compared to atmospheric is built up at the same time.

Either inert gas (e.g. nitrogen) or air must be used as the protective gas depending on the sample gas
composition. Dissipation of the protective gas into the Ex zone is only permissible with spark
protection and a particle barrier.

1.3 Internal explosion protection

Internal explosion protection refers to the sample gas path (containment system CS) in the analyzer
and to the ignition protection of the process gas. A differentiation must be made between the following
cases:

- Non-combustible sample gases and gas mixtures below the LEL: flame inhibitors can be

omitted. However, it must be guaranteed that the sample gas in the CS always remains below the
lower explosive limit!

- Sample gases which are seldom combustible and only for a brief period: flame inhibitors can be

omitted.

- Occasionally explosive sample gases: these may only be connected to the C 6F and O 6F gas

analyzers if both the sample gas inlet and outlet are provided with a flame inhibitor. The U 6F
analyzer may also be used without flame inhibitors.
The flame inhibitors must meet the safety requirements for the combustible medium.

- Frequently or permanently explosive gas mixtures: these must not be connected!

- Sample gases above the upper explosive limit: these must be assessed individually according to

separate certification for use of an inert gas as the protective gas.

Additional Equipment Manual EEx p E-3
Order No.:

A5E 000 58873-02

English

1.4 Further safety measures

The sample gas and reference gas lines must terminate outside the hazardous area at a point with no
danger; sample gas lines can be returned to the sampling point.

When connecting combustible or non-combustible sample gases into the hazardous area, both the
sample gas inlet and outlet must be provided with a flame inhibitor.

When connecting combustible media, the sample gas supply must be interrupted after switching off
the analyzer and the pressurized enclosure or when the pressurization is actuated in the event of a
fault.

The maximum permissible sample gas pressure in the analyzer depends on the type of connected
gas, and is described in Section 2.3 "Sample gas input conditions".

1.4.1 Analyzer versions

The containment system (sample gas path in the analyzer) is rated as without release if

- the gaseous medium is not combustible,

- the gaseous medium is combustible, but the gas concentration is always below the lower explosion

limit which must be guaranteed by a safety level of at least category 4 to EN 954,

- the gaseous medium is combustible, and the differential pressure between the housing and the

containment system is monitored. The pressure in the housing must always be at least 50 Pa above
the pressure in the containment system.

The differential pressure monitoring between the housing and the containment system must be carried
out with the following safety level:

- the pressure monitoring of the containment system by the system itself is at least category 1 to EN
954 (operational reliability) and the differential pressure monitoring between the containment system

and the protective gas of at least category 1 to EN 954, or

- the differential pressure monitoring between the containment system and the protective gas at least
corresponds to category 3 to EN 954 (fault tolerance, 1-fail-safe) without consideration of system­dependent safety.

A comparable international standard can also be applied instead of EN 954.

The assessment of the safety level of the monitoring device also comprises faults in the pressure or
gas lines. When rating the safety level of the monitoring device, it is assumed that the monitoring
devices are independent of one another. When linking the monitoring device into a total function, this
must be guaranteed with a safety level of at least category 3 to EN 954.

1.4.2 Analyzer versions EEx p "With continuous purging"

With gas/air mixtures above the LEL, fault tolerance of the containment system is not guaranteed in
the sense of EN 50016 since sample gas can be released into the pressurized housing as a result of
leaks (e.g. O-rings). However, this release can be assessed as limited. The maximum quantity
released is below 200 µl/min, and is guaranteed by the quality assurance measures of the analyzer
manufacturer when the analyzer is delivered.

Continuous purging of the EEx p housing must therefore be carried out following pre-purging. This
guarantees that sample gas released by a leak is diluted to such an extent that an explosive gas
mixture cannot occur. The volume flow of the protective gas has therefore been set to 1 l/min; this is
more than 100 times the maximum quantity released.

EEx p with "Compensation of losses resulting from leaks"

E-4 Additional Equipment Manual EEx p

Order No.:

A5E 000 58873-02

English

2. Technical specifications

2.1 Installation site

Danger zone Zone 1 and zone 2
Ambient temperature 5 ... 45 °C
Humidity Dew point must not be fallen below during storage and operation

2.2 Explosion protection

Ignition protection type - Pressurized enclosure EEx p with compensation of losses resulting

from leaks

(analyzer versions 7MB251x-xxx0x-xAEx, 7MB201x–xxxxx–2or3xxx
and 7MB211x–xxxxx–2or3xxx)

- Pressurized enclosure EEx p with continuous purging

(analyzer versions 7MB251x-xxx0x-xAFx, 7MB201x–xxxxx–6or7xxx
and 7MB211x–xxxxx–6or7xxx)

- Intrinsic safety i for keyboard isolation component and PROFIBUS-PA
output option

Appropriate standards - Analyzer versions EEx p with "Compensation of losses resulting from

leaks":

EN 50014:1997; EN 50016:1995; EN 50020:1994; EN 954:1996

- Analyzer versions EEx p with "Continuous purging":
EN 50014:1997; EN 50016:1995; EN 50020:1994; EN 954:1996;
ZH 1/10, paragraphs 1.4.3.2; 2.3.1

Temperature class*) CALOMAT 6F: T4

OXYMAT 6F, unheated: T4
OXYMAT 6F, heated: T3
ULTRAMAT 6F, unheated: T4
ULTRAMAT 6F, heated: T4

Explosion group IIC

*) Assuming that the doors of the housing are only opened 10 minutes after switching off the power

2.3 Sample gas input conditions

Gas type a) Non-combustible gases or gas mixtures which always remain below the

LEL according to category 4 to EN 954

b) Combustible gases up to gas mixtures which are occasionally explosive

Max. pressure p

Min. pressure p

max

min

Temperature C 6F: 0...60 °C

Sample gas flow q

For a) 1100 hPa (C 6F), 3000 hPa (O 6F) or 1500 hPa (U 6F)
For b) and analyzer versions EEx p with "Compensation of losses resulting

from leaks":

100 hPa (rel.) for C 6F
160 hPa (rel.) for O 6F and U 6F
For b) and analyzer versions EEx p with "Continuous purging":

1100 hPa for C 6F
3000 hPa for O 6F and 1500 hPa for U 6F

For a) 500 hPa (O 6F) or 600 hPa (U 6F)
For b) -200 hPa (rel.)

O 6F: 0...130 °C
U 6F: 0... 65 °C

C 6F: 0.5...1.5 l/min

V

O 6F: 0.3...1.0 l/min
U 6F: 0.3...1.5 l/min

Additional Equipment Manual EEx p E-5
Order No.:

A5E 000 58873-02

English

2.4 Pneumatic data of the protective gas

Housing volume: Approx. 50 l

Input pressure (to supply the
EEx p safety device): 0.2...0.4 MPa (2...4 bar)

Protective gas: - Inert gas (e.g. nitrogen from a gas cylinder)

- Air from an ex-free zone; prerequisite:
free from oil and dust, particle size <40 µm, oil
content <5 mg/m³ and dew point <2 °C at 0.4 MPa

Duration of pre-purging phase: 5 min

Flow during pre-purging phase ≥ 50 l/min (3000 l/h)

Min. protective gas pressure: - With non-combustible sample gases: 50 Pa (rel.)

- With combustible sample gases: 50 Pa (rel.)
plus additional 5 hPa above sample gas pressure

Consumption during operation: < 3 l/min (typically: < 1 l/min) for EEx p with

compensation of losses resulting from leaks;

≥ 1 l/min for EEx p with continuous purging

Max. load on the EEx p housing: 165 hPa (rel.)

Type test pressure on the EEx p housing: 250 hPa (rel.)

2.5 EEx p safety device

In principle, any EEx p safety device with a type examination certificate to ATEX can be used. It must
have at least the following features:

- A safety level of at least category 3 to EN 954 for monitoring during pre-purging, and a safety level of
at least category 1 to EN 954 for monitoring during operation, or a transferable safety level from
another comparable international standard.

- Adjustable pre-purging phase; purging gas pressure must be ≥ 50 l/min

- Limiting of purging gas pressure during the pre-purging phase: < 165 hPa

- Compensation of losses resulting from leaks or continuous purging ≥ 1 l/min (depending on version)

- Connection of purging gas lines: 10 mm or 3/8" diameter from/to the analyzer

- Input pressure for purging gas supply: 0.2...0.4 MPa

- Relay contacts for all-pole isolation of the analyzer's power supply

- Relay contacts for disconnecting additional equipment (e.g. Ex isolating relay)

- Connection facility for key switch with intrinsically-safe scann

- Only for analyzer versions with "Compensation of losses resulting from leaks": connection facility for

pressure switch with intrinsically-safe scanning

E-6 Additional Equipment Manual EEx p

Order No.:

A5E 000 58873-02

English

2.6 Differential pressure monitoring (only for analyzer versions EEx p

"Compensation of losses resulting from leaks"

The sample gas pressure must be supplied fail-safe to the analyzer (within the specified limits, see
Section 2.3). If only an operationally safe supply is available, an additional differential pressure switch
must be provided (see also point 5 in "Special conditions" of the EC-type examination certificate).

If flame inhibitors are specified, differential pressure switches and/or relative pressure sensors must be
connected via a T-piece between the sample gas inlet couplings and the flame inhibitors (see
Sections 3 "Assembly" and 3.2 "Assembly diagram for the versions EEx p with "Compensation of
losses resulting from leaks").

Accessories required for differential pressure monitoring:

- Differential pressure switches

-For non-corrosive sample gases:
Order No.: 7MB8000-5AB
Materials wetted by sample gas: NBR (buna N), aluminum
Switching point: Adjustable between 0 and 20 hPa

-For corrosive sample gases:
Order No.: 7MB8000-5AA
Material wetted by sample gas: 1.4571
Switching point: Adjustable between -20 and +20 hPa

)

2.7 Accessories (applies to all analyzer versions)

- Flame inhibitor Order No. 7MB8000-2BA

Material: 1.4571 (special materials on request)

The design of parts wetted by the sample gas must meet the application requirements and should be
selected accordingly.

- Isolating relay

Order No.: 7MB8000-4AB
Coil power supply: 110 V AC
Contacts: 8 NO contacts

Order No.: 7MB8000-4AA
Coil power supply: 240 V AC
Contacts: 8 NO contacts

- Isolating transformer

Order No.: 7MB8000-3AA
Output signal (safety): 15.8 V / 60 mA

Additional Equipment Manual EEx p E-7
Order No.:

A5E 000 58873-02

English

3. Assembly

3.1 Connection of sample gas and protective gas (purging gas)

Installation should take place at a vibration-free location where possible and protected from direct
solar radiation. The analyzer and the EEx p safety device must be fixed according to their dimensional
drawings and connected according to the assembly diagram in Section 3.2 or 3.3. You can find the
dimensional drawings in the appropriate manuals. The following conditions must be observed for
trouble-free operation:

- When tightening union nuts on the gas couplings, use a suitable open-ended spanner to achieve
correct counterlocking; otherwise the danger exist that the gas path will leak.

- The operator must ensure the minimum pressure of the protective gases at the installation site. A
pressure of 0.2...0.4 MPa (2...4 bar) must be applied at the pressure regulator of the EEx p safety
device.

- When the protective gas is tapped, the pressure drop over the line should not amount to more than 5
hPa (5 mbar) at a flow of 50 /min. To achieve this, the exhaust air line must be dimensioned
accordingly (the length of the exhaust air line may be about 20 m at an internal diameter of G 1”).

- The pre-purging time adjustable on the EEx p safety device (5 min with a purging gas flow of
50 l/min) must not be adjusted, i.e. dropped below!

- The EEx safety device is delivered with fixed basic parameters. The purging gas pressure is preset
to 105 hPa (rel.). Useful modifications such as reduction of the max. purging gas pressure can only
be made after studying the appropriate sections of the manual enclosed with the EEx p safety
device.

- Sample gas must not be supplied to the analyzer until the pre-purging phase has ended.

- It must always be guaranteed that the microflow sensor is surrounded by reference gas before the O

6F is switched on. Therefore the reference gas must also be connected (pre-purging period = 5 min)
when the EEx p safety device is switched on. The reference gas pressure must always be

0.2...0.4 MPa (2...4 bar) above the sample gas pressure.

- A key switch can be connected to the EEx p safety device (see Section 5.3 for details).

- Only for analyzer versions with "Compensation of losses resulting from leaks":

When using combustible sample gases, the difference between the purging gas and sample gas
pressures must be held constantly and reliably at more than 50 hPa. Differential pressure monitoring
must be provided for fail-safety. This should ensure that the EEx p safety device switches off the
analyzer and goes into the pre-purging phase when a set pressure difference is fallen below. It is up
to the user to select a suitable differential pressure monitoring device (e.g. differential pressure
switch).

The sample gas inlet of the O 6F contains a choke which creates a dynamic pressure to damp
pulsating flows. It is therefore recommendable to remove this choke if the differential pressure is to
be monitored (in versions "Compensation of losses resulting from leaks"). The damping measure
(choke) should be fitted upstream of the pressure measuring point when required.

- Only for analyzer versions with "Continuous purging":
Depending on the density of the sample gas, the inlet on the housing for the protective gas must be
selected as follows:
Sample gas density > protective gas density: Inlet: coupling 6; outlet: coupling 7

Sample gas density < protective gas density: Inlet: coupling 5; outlet: coupling 8

E-8 Additional Equipment Manual EEx p

Order No.:

A5E 000 58873-02

English

3.2 Assembly diagram for the versions EEx p with "Compensation of losses

resulting from leaks"

Gas connections:

C 6F and O 6F: 2 and 4

U 6F (SG): 1 and 2

U 6F (RG): 3 and 4

8

7

(see also associated

manual)

(only with

occasionally

combustible

gas

mixtures)

Sample

Flame inhibitors

gas outlet

Sample

gas inlet

5

+

-

p

N

OXYMAT 6F

CALOMAT 6F

ULTRAMAT 6F

Power supply

connection

pipelines:

Purging gas

PE L

6

max. 4 m long;

diameter > 8 mm

)

*

switch

pressure

Differential

Key switch

Intrinsically-safe

scanning of

pressure switch

Inlet of protective gas

(purging gas)

Outlet of

input pressure: 0,2...0,4 MPa

purging gas

into Ex-free

zone

*) With resistor for monitoring line breakages if applicable (see Instruction Manual of EEx p purging gas

monitoring device). If the sample gas cannot be applied with operational reliability, a second differential

pressure switch must be connected whose contact must be connected in series with the first switch.

With certain suppliers of EEx p purging gas monitoring devices, a relative pressure sensor can also be

connected instead of the differential pressure switch.

V1

EEx p purging gas monitoring device

Inlet valve

Outlet

valve

Control electronics

L1

N

Additional Equipment Manual EEx p E-9
Order No.:

A5E 000 58873-02

PE

English

3.3 Assembly diagram for the versions EEx p with "Continuous purging"

8

Sample

gas outlet

C 6F and O 6F: 2 and 4

Gas connections:

U 6F (SG): 1 and 2

U 6F (RG): 3 and 4

7*)

(see also associated

manual)

Sample

5

(only with

occasionally

combustible gas

mixtures)

gas inlet

Flame inhibitors

N

OXYMAT 6F

CALOMAT 6F

ULTRAMAT 6F

connection

Power supply

PE L

6*)

*) see Section 3.1:

"Connection of

sample gas and

protective gas

(purging gas)"

pipelines:

Purging gas

max. 4 m long;

diameter > 8 mm

1) Outlet choke;

dynamic pressure

> 1 hPa

at Q > 1 l/min

2) Overpressure

valve; opens in

the pre-purging

phase

Key switch

Choke

Q > 1 l/min

Choke Q > 50 l/min

Inlet valve

2) 1)

EEx p purging gas monitoring device

Outlet of

Inlet of protective gas

(purging gas)

Input pressure: 0,2...0,4 MPa

purging gas

into Ex-free

zone

Control electronics

L1

N

PE

E-10 Additional Equipment Manual EEx p

Order No.:

A5E 000 58873-02

English

3.4 Electric connections

Warning Proper handling of the equipment by qualified personnel with observance of the

warnings is a prerequisite for safe operation.
The regulations for installation of electrical systems in hazardous areas according to
DIN VDE 0165 (EN 60079-14) and the standards therein must be observed. Failure

8

8

88

- A mains circuit-breaker must be provided in the building installation.

- The housing of the analyzer must be connected to a potential equalizer (see also the appropriate

manual).

- Solid or stranded cables with a cross-section up to 2.5 mm² can be used for wiring the terminals.

- End ferrules must be fitted to all stranded wires.

- All connecting leads must be kept short inside the device.

- Intrinsically-safe lines must be labelled and laid separately from non-intrinsically-safe lines, keeping

the necessary minimum distances apart.

- Power supply and signal lines must be connected according to the terminal wiring plans of the
devices to be connected (see the appropriate manuals).

- Special care must be taken for the cable inlets (PG screwed glands). Sealing rings corresponding to
the cable diameter must be inserted for cable glands. Cable diameter ranges and torques (M) for the
PG screwed glands:

to do so can lead to considerable damage, serious injury or even death.

- PG 13.5: Cable diam.: 6...12 mm; M = 3.8 ± 0.2 Nm

- PG 16: Cable diam.: 10...14 mm; M = 5.0 ± 0.2 Nm

3.5 Inputs and outputs

The analog inputs and outputs of the analyzers are not intrinsically-safe in the standard version.

All non-intrinsically-safe inputs and outputs must be wired via Ex-coupling relays so that no external
voltages are produced when the purging gas in the device fails.

Additional Ex isolating components can be mounted on the rail in the analyzer (see also Section 5).
These additional devices must be agreed upon with the Ex specialist responsible.

Additional Equipment Manual EEx p E-11
Order No.:

A5E 000 58873-02

English

4. Commissioning

Commissioning can only be performed properly when the person doing the commissioning is familiar
with the contents of the manuals and operating instructions provided. The warnings in the individual
manuals must be observed in particular.

4.1 Connection to the EEx p safety device

The analyzer must be connected to the EEx p safety device as shown in the assembly diagrams 3.2
and 3.3:

- Check the power supply

- Seal all unnecessary cable glands using the supplied plugs

- Screw in the occupied screw cable glands carefully

- Close the doors. The screws must be tightened evenly until the door frame touches the housing

surface

- Connect protective gases with required pressure (0.2...0.4 MPa upstream of pressure regulator)

- Set the pressure regulator of the EEx p safety device to at least 0.2 MPa.

When measuring combustible gases with the type of protection EEx p with "Compensation of losses
resulting from leaks" it must be ensured that the sample gas pressure applied to the analyzer is not
more than 160 hPa (160 mbar) above the ambient pressure and always more than 5 hPa below the
purging gas pressure. If this condition cannot be met with fail safety, a differential pressure monitor
must be inserted between the sample gas and purging gas as additional protection.

The analyzer may then be started by opening the protective gas line and switching on the power
supply – under consideration of the measures described above.

4.2 Pressure correction

There is an internal pressure sensor in the U 6F for correcting the influence of air pressure. This is
connected to the ambient air by a pipe. To avoid explosive atmosphere diffusing into the pressure
sensor, this pipe must be connected with a hose which ends in the Ex-free zone.
A higher sample gas pressure up to 1500 hPa can only be measured with an external pressure
sensor. Its signal must be fed intrinsically-safe into the analyzer. Its parts which come into contact with
the sample gas must meet the requirements of the measurement. The connection and
parameterization are described in the appropriate equipment manual.

In the O 6F the influence of the sample gas pressure up to 2000 hPa can be corrected with the
internal pressure sensor. A higher pressure up to 3000 hPa can only be measured with an external
absolute pressure sensor.

4.3 Key switch

The Ex protection of the EEx p safety device can be deactivated (key inserted in the lock) using a key
switch (bypass switch). In this manner, the analyzer can also be connected electrically without
protective gas purging (e.g. for maintenance work).

Some EEx p safety devices offer the possibility of effecting the key switch function with an operating
function (key code).

Commissioning with the “key switch” always requires permission of the user or a person authorized by
him. It may only be granted if it is certain that there is no explosive atmosphere for the duration of the

planned work or if the necessary precautions against the risk of explosion have been taken (so-called
"Firing permission").

At the end of maintenance work, make absolutely sure that the key switch is turned off again.

E-12 Additional Equipment Manual EEx p

Order No.:

A5E 000 58873-02

English

5. Additional equipment

It is possible to add additional equipment/components to a mounting rail in the left hand part of the
analyzer. The following points must be observed:

- The mounting rail is approx. 250 mm long which limits the number of components which can be
installed.

- The max. installation height incl. mounting rail is 115 mm, but it is less in the vicinity of the display
(approx. 88 mm). The width should not exceed 100 mm.

- The additional equipment must be licensed for an ambient temperature of 60 °C, this temperature
can be reached under extreme conditions.

- The Ex protection types of the retrofitted components must also be specified on the analyzer.

- Installation must always be agreed upon with the Ex specialist responsible.

6. Maintenance

Following maintenance or the retrofitting of parts associated with explosion protection, the analyzer
may only be started when an Ex specialist has ensured that the analyzer has the essential features
and meets the requirements for explosion protection and issues a certificate to this effect or has
attached a test symbol to the equipment.

Annual maintenance of the analyzer must be carried out to check the electrical safety and reliable
operation, in particular the tightness of the sample gas path within the analyzer.
The owner can extend the maintenance interval in individual cases if no negative influences can be
expected with respect to chemical corrosion of the wetted parts materials (gaskets in particular).

6.1 Leak testing of containment system (sample gas path)

6.1.1 Recommended test setup for CALOMAT 6F and OXYMAT 6F

compressed air,
free of dust, oil and
condensation

2,4 = connections for sample gas path M = manometer (relative pressure)

3 = connection for reference gas (if present) DR

Bl = blanking plugs V1 = shut-off valve (leak rate < 10

Fig. 1: Setup for testing for leaks in the sample gas and reference gas paths

- Reference gas connection 3 (if present) and sample gas outlet 4 must each be closed by a

blanking plug. A shut-off valve (e.g. needle valve) of sufficient tightness must be connected
between sample gas inlet 2 and the sample gas line.

= pressure regulator

-5

mbar•l/s)

- A pressure sensor with a measuring range of 2000 hPa (O 6F) or 50 kPa (C 6F) and a resolution

of 1 hPa must be connected to the supply line.

Additional Equipment Manual EEx p E-13
Order No.:

A5E 000 58873-02

English

6.1.2 Recommended test setup for ULTRAMAT 6F

Bl 1, Bl 2 = blanking plugs M = manometer (relative pressure)
2 = outlet of sample gas path DR
4 = outlet of reference gas path V1 = shut-off valve (leak rate < 10

= pressure regulator

-5

mbar•l/s)

compressed air,
free of dust, oil and
condensation

Fig. 2: Setup for testing for leaks in the sample gas and flow-type reference gas paths (dashed)

E-14 Additional Equipment Manual EEx p

Order No.:

A5E 000 58873-02

English

- Sample gas inlet 1 must be closed by a blanking plug. A shut-off valve (e.g. needle valve) of
sufficient tightness must be connected between sample gas outlet 2 and the sample gas dissipation.

- A pressure sensor (measuring range: 50 kPa, resolution :1 hPa) must be connected to the supply
line.

- Proceed similarly for the reference gas path, if present (dashed line, connections 3 and 4).

6.1.3 Carrying out the leak test

- To establish a pressure, carefully open the needle valve until the test pressure has been reached in
the containment system. Then close the valve again.

- Before determining the rate at which the pressure drops, you must allow thermal compensation of
the system. A waiting time of 5 minutes is recommended. The temperature of the sample gas path
must not change during the test!

- Testing for leaks is carried out by determining the pressure change ∆p within a further 5 minutes.

- The gas path is sufficiently tight if the pressure change ∆p in 5 minutes is below the test value listed

in the following table.

OXYMAT 6F

CALOMAT 6F

ULTRAMAT 6F

*) The test values have been defined under the assumption that the volume between the shut-off units (valves)

and the containment system is max. 10 ml; this corresponds to a length of approx. 80 cm with a pipe of 4
mm internal diameter.

Test pressure 2.0 bar (rel.)

Test pressure

Test pressure 0.5 bar (rel.)

with a chamber length in mm

0.5 bar (rel.)

Test value*) ∆∆∆∆p in mbar

Test value*

Test value*) ∆∆∆∆p = 30 mbar

0.2...6 20 60 90 180

20 16 12 9 6

)

∆∆∆∆p = 24 mbar

6.2 EEx p safety device

The diagnostics and elimination of faults is described in the manual of the EEx p safety device
concerned.

The proportional valve controlled by the EEx p safety device is protected by a fuse. This fuse may be
located in an inaccessible part of the control electronics in some EEx p safety devices. The control
electronics must be replaced if the fuse is defective. The manufacturer must be notified of the serial
number to allow the replacement electronics to be provided with the same parameters as when
originally delivered. Repairs may only be made by authorized personnel of the EEx p safety device’s
manufacturer.

It is not possible to switch over to the pre-purging phase if the proportional valve or outlet valve fails.

6.3 Analyzers and additional equipment

Maintenance and troubleshooting of the analyzers and additional equipment is described in the
appropriate manuals.
The tightness of the gas line must be checked after any manipulation, e.g. cleaning the sample
chamber. The test can be made according to the procedure described in Section 6.1.

6.4 Spare parts

Only the following spare part may be used in the event of damage to the left-hand door module (with
keyboard and display):

Left door, complete (Ex), Order No. A5E00063409

There is a fuse on the rear of the left door. Only the following type may be used as a replacement:

Device fuse (Ex), Order No. A5E00061501

Additional Equipment Manual EEx p E-15
Order No.:

A5E 000 58873-02

English

E-16 Additional Equipment Manual EEx p

Order No.:

A5E 000 58873-02

@1PA5E00058873@

1P A5E00058873

Siemens AG

Automation and Drives Group
Process Instrumentation Division
D-76181 Karlsruhe

www.siemens.com

A5E00058873ED-02