Bühler technologies GAS 222.35U Installation instructions

Gas Analysis
Installation and Operation Instructions
Original instructions
Sample gas probes
GAS 222.35U
BE460059
09/2021
Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. [phone] / 49 89-0, Fax: [phone] / 49 89-20
E-Mail: [email protected]
Internet: www.buehler-technologies.com

Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. [phone] / 49 89-0, Fax: [phone] / 49 89-20
Internet: www.buehler-technologies.com
E-Mail: [email protected]
Read this instruction carefully prior to installation and/or use. Pay at-
tention particularly to all advises and safety instructions to prevent in-
juries. Bühler Technologies can not be held responsible for misusing
the product or unreliable function due to unauthorised modifications.
All rights reserved. Bühler Technologies GmbH 2021
Document information
Document No......................................................... BE460059
Version......................................................................... 09/2021

GAS 222.35U
Table of Contents
1 Introduction..................................................................................................................................................................................................................... 2
1.1 Intended Use.........................................................................................................................................................................................................2
1.2 Type Plate............................................................................................................................................................................................................... 2
1.3 Scope of Delivery..................................................................................................................................................................................................2
1.4 Ordering Instructions......................................................................................................................................................................................... 3
1.5 Product Description............................................................................................................................................................................................ 3
2 Safety instructions.........................................................................................................................................................................................................4
2.1 Important advice .................................................................................................................................................................................................4
2.2 General Hazard Warnings ................................................................................................................................................................................ 5
3 Transport and storage .................................................................................................................................................................................................. 7
4 Installation and connection ........................................................................................................................................................................................8
4.1 Installation site requirements.........................................................................................................................................................................8
4.2 Installation ............................................................................................................................................................................................................8
4.3 Installing the upstream filter ..........................................................................................................................................................................8
4.4 Connecting the Gas Line....................................................................................................................................................................................9
4.4.1 Blowback Connection......................................................................................................................................................................... 9
4.4.2 Connecting the calibrating gas line (optional)........................................................................................................................... 9
4.5 Connecting the Blowback and Pressure Vessel (Optional) ...................................................................................................................10
4.6 Electrical Connections......................................................................................................................................................................................10
4.6.1 Heated Pressure Vessel (Optional) .................................................................................................................................................11
5 Operation and Control.................................................................................................................................................................................................12
5.1 Before Start-Up .................................................................................................................................................................................................. 12
6 Maintenance...................................................................................................................................................................................................................13
6.1 Maintaining the Filter Element..................................................................................................................................................................... 14
6.1.1 Replacing the upstream filter.........................................................................................................................................................14
6.2 Blowback of the in-situ filter (within the process stream).....................................................................................................................15
6.2.1 Manual Blowback (Without Blowback Control) ........................................................................................................................ 15
6.2.2 Automatic Blowback (External Blowback Control)................................................................................................................... 15
6.3 Maintenance Schedule .................................................................................................................................................................................... 16
7 Service and repair..........................................................................................................................................................................................................17
7.1 Troubleshooting .................................................................................................................................................................................................17
7.2 Spare Parts and Accessories ............................................................................................................................................................................17
8 Disposal........................................................................................................................................................................................................................... 18
9 Appendices..................................................................................................................................................................................................................... 19
9.1 Technical Data.................................................................................................................................................................................................... 19
9.2 Flow chart ............................................................................................................................................................................................................ 19
9.3 Dimensions ........................................................................................................................................................................................................ 20
9.4 Connection diagram heated pressure vessel............................................................................................................................................ 21
9.5 User book (Please make copies) ....................................................................................................................................................................22
10 Attached Documents................................................................................................................................................................................................... 23
iBühler Technologies GmbHBE460059 ◦ 09/2021

GAS 222.35U
1 Introduction
1.1 Intended Use
The sample gas probe is intended for installation into gas analysis systems in commercial applications.
Sample gas probes are among the main components in a gas conditioning system.
– Therefore also note the related drawing in the data sheet in the appendix.
– Before installing the device, verify the listed technical data meet the application parameters.
– Further verify all contents are complete.
Please refer to the type plate to identify your model. In addition to the job number/ID number, this also contains the article
number and model designation.
Please note the specific values of the device when connecting, and the correct versions when ordering spare parts.
1.2 Type Plate
Example:
GAS 222.30U
100107323 462230009902000112213 001
230V 50/60Hz 440W
Material: 1.4571/1.4408/PTFE
Read manual!
Manufacturer and address
Model designation
Order no., Item no.
Material
Electrical supply
1.3 Scope of Delivery
– 1 x Sample gas probe
– 1 x Flange gasket and screws
– Product documentation
– Connection and mounting accessories (only optional)
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GAS 222.35U
1.4 Ordering Instructions
The item number is a code for the configuration of your unit. Please use the following model key:
4622235 0 9 9 0 0 X 0 0 X X X X X X Product Characteristics
Flange / approval
DIN DN65 PN6
Power supply sample probe
none
Calibrating gas connection
0 No calibrating gas connection
1 6 mm
2 6 mm + check valve
3 1/4"
4 1/4" + check valve
Connection heated extension
No
Built-in temperature controller for heated extension
No
Blowback with air reservoir 1)
Air reservoir bracket
Air reservoir heating
1 Yes
9 No
Built-in blowback control
9 No
Compressed air valve / valve voltage information
0 Manual
1 115 V
2 230 V
3 24 V
9 None (if no blowback requested)
Pneumatic drive for ball valve
9 N/A
Limit switch for pneumatic drive
9 No
Control valve for pneumatic drive
9 No control valve
1) For flammable sample gas, always use inert gas for blowback. Probe blowback prohibited when using explosive gases!
1.5 Product Description
Probe Description
GAS 222.35-U Probe with retractable inlet filter and blowback connection
Accessories Please refer to the data sheet at the end of this manual for accessories for this probe
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GAS 222.35U
2 Safety instructions
2.1 Important advice
This unit may only be used if:
– The product is being used under the conditions described in the operating- and installation instructions, used according to
the nameplate and for applications for which it is intended. Any unauthorized modifications of the device will void the war-
ranty provided by Bühler Technologies GmbH,
– Complying with the threshold values specified in the data sheet and the instructions,
– Equipment is operated in intrinsically safe electric circuits.
– The controller itself is installed outside the explosive area,
– Monitoring equipment / protection devices must be connected correctly,
– Service and repair work not described in these instructions are performed by Bühler Technologies GmbH,
– Using genuine replacement parts.
– Erecting electrical systems in explosive areas requires compliance with regulation EN 60079-14.
– Additional national regulations pertaining to initial operation, operation, maintenance, repairs and disposal must be ob-
served.
– These operating instructions are a part of the equipment. The manufacturer reserves the right to change performance-, spe-
cification- or technical data without prior notice. Please keep these instructions for future reference.
Signal words for warnings
DANGER
Signal word for an imminent danger with high risk, resulting in severe injuries or death if not avoided.
WARNING
Signal word for a hazardous situation with medium risk, possibly resulting in severe injuries or death if not
avoided.
CAUTION
Signal word for a hazardous situation with low risk, resulting in damaged to the device or the property or
minor or medium injuries if not avoided.
NOTICE
Signal word for important information to the product.
Warning signs
These instructions use the following warning signs:
Warns of a general hazard General notice
Warns of voltage Unplug from mains
Warns not to inhale toxic gasses Wear respiratory equipment
Warns of corrosive liquids Wear a safety mask
Warns of explosive areas Wear gloves
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GAS 222.35U
2.2 General Hazard Warnings
The maximum surface temperatures of the probes also vary based on operating conditions (steam temperature, sample gas in-
let temperature, ambient temperature, fluid flow rate). When used in explosive areas, also particularly note the related hazard
warnings.
The equipment must be installed by a professional familiar with the safety requirements and risks.
Be sure to observe the safety regulations and generally applicable rules of technology relevant for the installation site. Prevent
malfunctions and avoid personal injuries and property damage.
The operator of the system must ensure:
– Safety notices and operating instructions are available and observed,
– The respective national accident prevention regulations are observed,
– The permissible data and operational conditions are maintained,
– Safety guards are used and mandatory maintenance is performed,
– Legal regulations are observed during disposal,
– compliance with national installation regulations.
Maintenance, Repair
Please note during maintenance and repairs:
– Repairs to the unit must be performed by Bühler authorised personnel.
– Only perform conversion-, maintenance or installation work described in these operating and installation instructions.
– Always use genuine spare parts.
– Do not install damaged or defective spare part. If necessary, visually inspect prior to installation to determine any obvious
damage to the spare parts.
Always observe the applicable safety and operating regulations in the respective country of use when performing any type of
maintenance.
NOTICE When used in explosive areas
The basic version of the probe is not suitable for use in Zone 1 or 21 explosive areas. The
accessories selected (e.g. add-on parts such as solenoid valves, heated blowback vessel...)
may severely limit the approved applications.
When using category 3G or 3D accessories, the are of application for the probe is limited
to Zone 2 or Zone 22. Therefore be sure to note the type plates for all add-on parts. Partic-
ularly pay attention to the ignition protection markings and all hazard warnings in this
manual.
DANGER Adiabatic compression during gas blowback (explosion hazard)!
Adiabatic compression may cause high gas temperatures and must be checked by the
user.
Gas blowback may result in high gas temperatures due to adiabatic compression. This
can cause flammable gases to ignite spontaneously.
a) Blowback of explosive atmosphere / gases is prohibited.
b) Flammable atmosphere / gases (non-explosive) may only be blown back with nitro-
gen (inert gas).
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
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DANGER Toxic, corrosive gas/condensate
Sample gas/condensate may be hazardous to health.
a) If necessary, ensure a safe gas/condensate discharge.
b) Always disconnect the gas supply when performing maintenance or repairs.
c) Protect yourself from toxic/corrosive gasses/condensate when performing mainten-
ance. Wear appropriate protective equipment.
DANGER Explosion hazard
Life and explosion risk may result from gas leakage due to improper use.
a) Use the devices only as described in this manual.
b) Regard the process conditions.
c) Check tubes and hoses for leakage.
DANGER
Use in explosive areas
Flammable gasses and dust could ignite or explode. Avoid the following hazard sources:
Sparking!
Protect the equipment from external blows.
Flame propagation!
If the process holds a risk of flame propagation, install a flame arrestor.
Dust:
If possible, take the electrical components which must be opened for repair to a dust-
free room. If unable to do so, prevent dust from entering the housing.
Ignition of dust layers!
When using the device in a dusty environment, routinely clean dust from all compon-
ents. Also remove layers of dust in inaccessible areas.
DANGER Dangerous electrostatic charge (explosion hazard)
Incendive electrostatic charges may occur when cleaning plastic housing parts and
decals (e.g. with a dry cloth or compressed air). The sparks this produces could ignite
flammable, explosive atmospheres.
Always clean plastic housing parts and decals with a damp cloth!
DANGER Explosion hazard due to high liquid temperatures
Hot steam and hot sample gas cause in a high probe surface temperature. The highest
fluid temperature is approximately the maximum probe surface temperature.
a) Always ensure a safety clearance of at least 20 K between the fluid temperature
(steam, sample gas) and ignition temperature of explosive atmosphere (by measur-
ing and monitoring the temperature).
b) Also be sure to stay well below the smouldering temperatures of dust.
c) Observe the relevant requirements in standards regarding the max. permissible sur-
face temperature and ignition temperature of explosive atmosphere.
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GAS 222.35U
3 Transport and storage
Only transport the product inside the original packaging or a suitable alternative.
The equipment must be protected from moisture and heat when not in use. They must be stored in a covered, dry and dust-free
room at a temperature between -20°C to 50°C (-4°F to 122°F).
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GAS 222.35U
4 Installation and connection
4.1 Installation site requirements
Sample gas probes are intended for flange mounting.
– Installation site and installation position are determined based on requirements specific to the application.
– If necessary, the connection piece should be slightly tilted toward the centre of the channel.
– The installation site should be protected from the weather.
– In addition, adequate and safe access for installation and future maintenance work should be provided. Particularly follow
the uninstalled size of the probe tube!
If the probe is transported to the installation site in pieces, it will first need to be assembled.
4.2 Installation
DANGER Danger to life and explosion during installation and maintenance
The unit must not be worked on (assembly, installation, maintenance) in explosive at-
mospheres.
DANGER Explosion hazard
When used in explosive areas
Flammable gasses and dust could ignite or explode.
Never operate the gas probe outside the specifications. Extracting gases or gas mixtures
which are also explosive in the absence of air is prohibited.
DANGER Explosion hazard due to ignition of dust
When using the device in a dusty environment, routinely clean dust from all compon-
ents.
The ignition temperature resp. smouldering temperature of flammable dusts resp. dust
layers present must be considerably higher than the maximum surface temperature of
the device (observe applicable standards and statutory regulations).
If possible, take the electrical components which must be opened for repair to a dust-
free room. If unable to do so, prevent dust from entering the housing.
DANGER Explosion hazard due to flame propagation
Severe injuries and damage to the system
If the process holds a risk of flame propagation, install a flame arrestor.
DANGER Dangerous electrostatic charge (explosion hazard)
Incendive electrostatic charges may occur when cleaning plastic housing parts and
decals (e.g. with a dry cloth or compressed air). The sparks this produces could ignite
flammable, explosive atmospheres.
Always clean plastic housing parts and decals with a damp cloth!
4.3 Installing the upstream filter
The upstream filter, if necessary with matching extension, must be screwed in. The probe is then attached to the mating flange
using the included seals and screws.
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GAS 222.35U
4.4 Connecting the Gas Line
The sample gas line must be carefully and properly connected using a suitable fitting.
This table provides an overview of the sample gas probe connections:
Probe
GAS 222
Reservoir
PAV01
Ball valve
pneumatic drive
Control valve
3/2-way solenoid
valve
Connecting flange 1) DN65/PN6/
DN3“-150 2)
Sample gas inlet G3/4
Sample gas outlet NPT 1/4
Blowback connection G3/8
Test gas connection 1) Tube Ø6 mm
Tube Ø1/4 2)
Filling port NPT 1/4
Condensate G1/2
Bypass NPT 1/4
Control air G1/8 G1/4
NPT 1/4
Tab.1: Gas Probe Connections (Varies by Model)
1) Varies by version.
2) Only GAS 222.xx ANSI and GAS 222.xx AMEX
WARNING Gas emanation
Sample gas can be harmful to the health!
Check the lines for leaks.
4.4.1 Blowback Connection
Without accessories installed for the blowback device, the blowback connection comes with a sealed G3/8 screw-in connection. If
you require blowback, you will need to undo this screw-in connection and ensure the blowback line is connected properly and
tight.
DANGER Toxic, corrosive gasses
Explosive or toxic gases can develop due to a leaking or open blowback connection.
4.4.2 Connecting the calibrating gas line (optional)
Connecting the calibrating gas line requires a Ø6 mm or Ø1/4” pipe fitting.
If the calibrating gas connection was ordered with check valve, a Ø6 mm or Ø1/4” pipe can be connected directly to the check
valve.
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4.5 Connecting the Blowback and Pressure Vessel (Optional)
The air lines must be connected carefully and properly, using suitable fittings.
If the probe is equipped with pressure vessel for efficient blowback (optional), a manual shut-off valve (ball valve) must be in-
stalled in the air supply, immediately upstream from the pressure vessel.
On probes used to sample flammable gas, nitrogen (inert gas) must be used for blowback. Blowback of explosive gases is prohib-
ited.
NOTICE
The operating pressure of the compressed air (inert gas) required for blowback must al-
ways be higher than the process pressure.
Required pressure differential min. 3 bar (44 psi).
DANGER Broken pressure vessel
Gas leak, danger due to flying parts.
Maximum operating pressure of the pressure vessel 10 bar (145 psi)!
The operating pressure reduces based on the operating voltage (see solenoid valve type
plate).
DANGER Adiabatic compression during gas blowback (explosion hazard)!
Adiabatic compression may cause high gas temperatures and must be checked by the
user.
Gas blowback may result in high gas temperatures due to adiabatic compression. This
can cause flammable gases to ignite spontaneously.
a) Blowback of explosive atmosphere / gases is prohibited.
b) Flammable atmosphere / gases (non-explosive) may only be blown back with nitro-
gen (inert gas).
4.6 Electrical Connections
DANGER Explosion hazard due to absence of potential equalisation
The device must be connected to potential equalisation (earthed) at the designated
points.
Please observe the local regulations and guidelines.
CAUTION Wrong mains voltage
Wrong mains voltage may damage the device.
Regard the correct mains voltage as given on the type plate.
Atex valves only:
DANGER Explosion hazard when opening the solenoid valve housing
The solenoid valve is a closed system. It must not be removed!
A fuse suitable for the rated current (max. 3 x Ib per IEC60127-2-1) or a protective motor switch with short circuit and fast
thermal response (set for rated current) must be connected upstream from each magnet to prevent short-circuits.
– For magnets with a very low rated current, a fuse of the lowest current value under the IEC standard will suffice. This fuse
must be connected separately, upstream.
– The rated fuse voltage must be equal to or greater than the specified nominal voltage (UN +10%) of the magnet. The fuse rat-
ing is specified in the type plate of the solenoid valve.
– The limiting breaking capacity of the fuse element must be equivalent to or greater than the maximum short-circuit current
expected at the installation site (typically 1500A).
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4.6.1 Heated Pressure Vessel (Optional)
A heated blowback vessel may optionally be used for blowback. Heated via self-regulating PTC heating cartridge to protect
against frost.
The electrical connection (mains connection 115/230 V AC) uses a cubic plug as per DIN 43650. Please refer to the terminal dia-
gram at the end for the connection.
– Only use cables with a temperature resistance of >100°C to connect to power.
– Make sure the connecting cable has sufficient strain relief (match cable diameter to the seal on the socket).
– When connecting, also observe the applicable Ex protection regulations and general warnings in these operating instruc-
tions.
CAUTION Equipment damage
Cables damaged
Do not damage the cable during installation. Install a strain relief for the cable connec-
tion. Secure the cable against twisting and loosening. Please note the temperature res-
istance of the cables (> 100°C/212°F).
DANGER Adiabatic compression during gas blowback (explosion hazard)!
Adiabatic compression may cause high gas temperatures and must be checked by the
user.
Gas blowback may result in high gas temperatures due to adiabatic compression. This
can cause flammable gases to ignite spontaneously.
a) Blowback of explosive atmosphere / gases is prohibited.
b) Flammable atmosphere / gases (non-explosive) may only be blown back with nitro-
gen (inert gas).
DANGER When used in explosive areas:
Application limitations
Heated pressure vessels suitable for use in Ex areas bear an ignition protection mark in
the type plate. These pressure vessels are only suitable for use in Zone 2 (equipment cat-
egory 3G).
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GAS 222.35U
5 Operation and Control
NOTICE
The device must not be operated beyond its specifications.
5.1 Before Start-Up
Before starting the device, verify
– the hose- and electrical connections are not damaged and correct installed.
– no parts of the gas probe have been removed.
– the safety and monitoring devices are installed and functional.
– the gas inlet and outlet of the gas probe are open.
– ambient parameters are met.
– the performance specifications in the type plate are met.
– voltage and frequency in the type plate match the mains values.
– all connection cables are installed without strain.
– precautions have been taken.
– cable glands are sealed properly.
– the earth is proper and functional.
When used in Ex areas, also verify the probe and all add-on parts are suitable for use (observe type plates and ignition
protection markings) and compliance with applicable Ex regulations.
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6 Maintenance
During maintenance, remember:
– The equipment must be maintained by a professional familiar with the safety requirements and risks.
– Only perform maintenance work described in these operating and installation instructions.
– When performing maintenance of any type, observe the respective safety and operation regulations.
DANGER Danger to life and explosion during installation and maintenance
The unit must not be worked on (assembly, installation, maintenance) in explosive at-
mospheres.
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
DANGER Toxic, corrosive gases
The measuring gas led through the equipment can be hazardous when breathing or
touching it.
a) Check tightness of the measuring system before putting it into operation.
b) Take care that harmful gases are exhausted to a save place.
c) Before maintenance turn off the gas supply and make sure that it cannot be turned
on unintentionally.
d) Protect yourself during maintenance against toxic / corrosive gases. Use suitable pro-
tective equipment.
CAUTION Hot surface
Risk of burns
Depending on the operating parameters, the housing temperature may reach over 100
°C during operation.
Allow the unit to cool down before performing maintenance.
DANGER Explosion hazard due to ignition of dust
When using the device in a dusty environment, routinely clean dust from all compon-
ents.
The ignition temperature resp. smouldering temperature of flammable dusts resp. dust
layers present must be considerably higher than the maximum surface temperature of
the device (observe applicable standards and statutory regulations).
If possible, take the electrical components which must be opened for repair to a dust-
free room. If unable to do so, prevent dust from entering the housing.
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6.1 Maintaining the Filter Element
The probes feature a particle filter which needs to be changed as it becomes dirty.
To do so, disconnect the voltage supply and if applicable close the shut-off valve to the process or switch off the process.
CAUTION!Do not damage the rear filter seat.
NOTICE
The stainless steel filter elements can be cleaned with an ultrasonic bath and reused sev-
eral times; in this case always use new seals on the filter and handle plug.
DANGER Toxic, corrosive gases
The measuring gas led through the equipment can be hazardous when breathing or
touching it.
a) Check tightness of the measuring system before putting it into operation.
b) Take care that harmful gases are exhausted to a save place.
c) Before maintenance turn off the gas supply and make sure that it cannot be turned
on unintentionally.
d) Protect yourself during maintenance against toxic / corrosive gases. Use suitable pro-
tective equipment.
DANGER Explosion hazard due to high liquid temperatures
Hot steam and hot sample gas cause in a high probe surface temperature. The highest
fluid temperature is approximately the maximum probe surface temperature.
a) Always ensure a safety clearance of at least 20 K between the fluid temperature
(steam, sample gas) and ignition temperature of explosive atmosphere (by measur-
ing and monitoring the temperature).
b) Also be sure to stay well below the smouldering temperatures of dust.
c) Observe the relevant requirements in standards regarding the max. permissible sur-
face temperature and ignition temperature of explosive atmosphere.
6.1.1 Replacing the upstream filter
The probes are equipped with an upstream filter which is always inside the process stream. The filter is suitable for blowback
with compressed air (inert gas), i.e. blowing air (inert gas) through the filter from the inside to the outside to remove adhering
particles. When sampling flammable gases, nitrogen (inert gas) must be used for blowback. Blowback of explosive gases is pro-
hibited.
The effectiveness of cleaning a filter within a process is directly influenced by the available airflow (amount of gas). We there-
fore recommend using a pressure vessel directly on the probe.
With sufficient upstream filter blowback (within the process stream) the probes are maintenance-free. However, due to process
conditions the filter may clog over time. In this case the filter element will need to be replaced.
Proceed as follows:
– Slightly push in the handle at the back of the probe and turn 90° (handle must then be horizontal) and remove.
– Screw the dirty filter element out of the handle.
– Check the sealing faces on the handle, replace O-rings, then install the filter element and new seal. (The spare filter includes
O-rings and seals).
– Then insert the handle with the new or cleaned filter, push in slightly and turn 90° (handle must then be vertical). Pull on the
handle to verify the filter element is firmly seated.
NOTICE
The weather hood can only be closed again when the handle is completely vertical. In or-
der to do so, loosen the hood from the locking supports by lifting slightly and then fold
down. Ensure that the hood lock clicks into place correctly.
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Condensate inside the pressure vessel
Depending on the installation site and application conditions a small amount of condensate may form inside the blowback air
pressure vessel. Open the drain screw at the bottom of the vessel and drain the condensate at least once a year.
If the probe needs to be serviced more frequently due to operating conditions, we recommend also draining the condensate at
these intervals.
CAUTION High pressure
Pressure vessel under pressure.
Before opening the condensate drain, close the air supply to the blowback control and
drain the vessel by manual blowback.
Pressing the main switch for the blowback control to interrupt the voltage supply.
6.2 Blowback of the in-situ filter (within the process stream)
DANGER Adiabatic compression during gas blowback (explosion hazard)!
Adiabatic compression may cause high gas temperatures and must be checked by the
user.
Gas blowback may result in high gas temperatures due to adiabatic compression. This
can cause flammable gases to ignite spontaneously.
a) Blowback of explosive atmosphere / gases is prohibited.
b) Flammable atmosphere / gases (non-explosive) may only be blown back with nitro-
gen (inert gas).
Be sure to use filtered air with a minimum rating of PNEUROP / ISO Class 4 for blowback:
Class Particles / m3
Particle size:
(1 to 5) µm
Pressure dew point
[°C]
Residual oil content
[mg / m3]
4to 1000
(no particles ≥ 15 µm)
≤ 3 ≤ 5
6.2.1 Manual Blowback (Without Blowback Control)
The shut-off valve in the air supply (inert gas supply) to the pressure vessel must be open. The optional pressure gauge on the
pressure vessel shows the current operating pressure.
– To blowback, first close the shut-off valve in the gas probe (handle below the probe/weather hood).
– Then abruptly open the ball valve inside the connecting line from the pressure vessel to the probe until the display on the
pressure gauge has dropped to the lowest reading.
– After blowback, close the ball valve and open the shut-off valve in the probe.
6.2.2 Automatic Blowback (External Blowback Control)
For automatic blowback, the shut-off valve in the probe with must have a pneumatic control (optional). The control unit for the
system is designed for sequential valve control, i.e.:
1. Close the shut-off valve in the probe using the pneumatic control.
2. Open the solenoid valve between the pressure vessel and probe for approx. 10 seconds.
3. Open the shut-off valve in the probe.
Blowback can also be set as a closed process at intervals ranging from several minutes to hours or even days based on require-
ments.
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6.3 Maintenance Schedule
NOTICE
When using the probe in explosive areas the maintenance schedule must be observed!
Maintenance schedule for normal ambient conditions:
Component Interval in operating hours Work to be performed To be performed by
Entire probe every 8000 h – Check gas connections
– Proper function, dirt.
If damaged, replace or have repaired by Bühler.
Operator
Entire probe based on dust level
(layer must be <3mm)
– Remove dust. Operator
Filter every 8,000 h – Check dirt level of filter. Operator
Seals every 8,000 h – Replace O-rings.
– Replace seals after every filter change.
Operator
Entire probe after 20,000h or 3years Inspection by Bühler Service technician/Bühler
16 Bühler Technologies GmbH BE460059 ◦ 09/2021

GAS 222.35U
7 Service and repair
This chapter contains information on troubleshooting and correction should an error occur during operation.
Repairs to the unit must be performed by Bühler authorised personnel.
Please contact our Service Department with any questions:
Tel.: [phone] or your agent
If the equipment is not functioning properly after correcting any malfunctions and switching on the power, it must be inspected
by the manufacturer. Please send the equipment inside suitable packaging to:
Bühler Technologies GmbH
- Reparatur/Service -
Harkortstraße 29
40880 Ratingen
Germany
Please also attach the completed and signed RMA decontamination statement to the packaging. We will otherwise be unable to
process your repair order.
You will find the form in the appendix of these instructions, or simply request it by e-mail:
[email protected].
7.1 Troubleshooting
CAUTION Risk due to defective device
Personal injury or damage to property
a) Switch off the device and disconnect it from the mains.
b) Repair the fault immediately. The device should not be turned on again before elim-
ination of the failure.
Problem / Malfunction Possible cause Action
No or reduced gas flow – Filter element clogged – Clean or replace filter element
– Gas circuit clogged – Clean sampling tube
– Ball valve closed – Open ball valve
– Blowback (optional) not responding – Check compressed air supply
– Check solenoid valve, check pneumatic
control
Tab.2: Troubleshooting
7.2 Spare Parts and Accessories
Please also specify the model and serial number when ordering parts.
Upgrade and expansion parts can be found in our catalog.
Available spare parts:
Item no. Description
90 090 79 Flange seal DN65 PN6
46 222 351 5 O-ring kit for filter element and probe, material: Viton/Cu
Please refer to the accessories data sheet in the appendix for filter elements
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GAS 222.35U
8 Disposal
Dispose of parts so as not to endanger the health or environment. Follow the laws in the country of use for disposing of elec-
tronic components and devices during disposal.
18 Bühler Technologies GmbH BE460059 ◦ 09/2021