Atest Gaz Teta EcoTerm User manual

POD-054-ENG R01
User Manual
Gas Detector
Teta EcoTerm
Product code: PW-113-NG

We design, manufacture, implement and support
Systems for Monitoring, Detection and Reduction of gas hazards
We invite you to familiarize yourself with our offer on www.atestgaz.pl
Atest Gaz A. M. Pachole sp. j.
ul. Spokojna 3, 44-109 Gliwice
Poland
tel. [phone]
fax [phone]
e-mail [email protected]
www.atestgaz.pl

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Remarks and reservations
Read and understand this manual prior to connection and operation of the device. Keep the User
Manual with the device for future reference.
The manufacturer shall not be held responsible for any errors, damage or defects caused by
improper selection of suitable devices or cables, errors in installation of equipment or any misuse
due to failure to understand the document content.
Unauthorised repairs and modifications of the device are not allowed. The manufacturer shall
discard any responsibility for consequences of such actions.
E posure of the device to the impact of e cessive mechanical, electric or environmental factors
may lead to damage of the device.
Operation of damaged or incomplete devices in not allowed.
Engineering of a gas safety system for any specific facilities to be safeguarded may need
consideration of other requirements during the entire lifetime of the product.
Use of unauthorized spare parts different from the ones listed in Table 6 is strictly forbidden.
Ho to use this manual?
Important fragments of the te t are highlighted in the following way:
Pay e treme attention to information provided in such framed bo es.
This User Manual consists of a main te t and attached appendices. The appendices are
independent documents and can be used separately from this Manual. Page numbering of
appendices starts anew with no relationship to pare numbering of the main document and
appendices may have their own tables of contents. In the right bottom corner of each page you
can find the name (symbol) of any document included into the User Manual package with its
revision (issue) number.
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Table of contents
1 Preliminary information..........................................................................................................................5
1.1 Purpose..................................................................................................................................................5
1.2 Operation principle...............................................................................................................................5
2 Safety......................................................................................................................................................7
3 Description of the construction...............................................................................................................8
4 Input-output interfaces...........................................................................................................................8
4.1 Electric interface.....................................................................................................................................8
5 User interface..........................................................................................................................................9
5.1 Indication of the device status...............................................................................................................9
5.2 Display..................................................................................................................................................10
6 System architectures..............................................................................................................................11
6.1 Data bus architecture...........................................................................................................................11
7 Life cycle................................................................................................................................................11
7.1 Transportation......................................................................................................................................11
7.2 Installation............................................................................................................................................11
7.3 Mechanical mounting of detectors......................................................................................................12
7.4 Commissioning of the gas monitoring system......................................................................................13
7.5 Configuration of gas detectors.............................................................................................................14
7.6 Troubleshooting...................................................................................................................................14
7.7 Maintenance schedule.........................................................................................................................15
7.8 Utilization.............................................................................................................................................18
8 Technical specification...........................................................................................................................19
9 List of consumables...............................................................................................................................19
10 List of accessories................................................................................................................................20
11 Product marking..................................................................................................................................20
12 Appendices..........................................................................................................................................20
List of Tables
Table 1: Electric connections.......................................................................................................................8
Table 2: Indication of the gas detector operation modes...........................................................................10
Table 3: Types of suitable cables................................................................................................................13
Table 4: Possible reasons for error signals.................................................................................................15
Table 5: Technical specification..................................................................................................................19
Table 6: List of consumables......................................................................................................................19
Table 7: List of accessories.........................................................................................................................20
Table 8: Method of product's marking.......................................................................................................20
List of Figures
Figure 1: The construction of the device and its dimensions.......................................................................8
Figure 2: Arrangement of gas detectors according to the data bus architecture........................................11
Figure 3: An example of cable termination inside a gas detector...............................................................13
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1 Preliminary information
1.1 Purpose
Gas detector Teta EcoTerm is designed as crucial components of the Teta Gas system for monitoring of
hazardous gas concentrations and are dedicated to detect e cessive (hazardous) concentrations of methane
in public access facilities, in particular in underground garages and car parks, boilers or industrial halls.
Teta EcoTerm gas detector is not designed for operation in areas with potentially e plosive
atmospheres.
Key features of gas detectors:
Power supply and data transmission via a single two-core cable.
Safe installation with low power supply voltage of any polarization.
Easy assembling and networking.
Simple and clear procedure to assign and verify addresses of individual detectors within a gas
monitoring network.
Possibility to verify status of individual detectors by means of the supervising control unit.
Optional calibration of the detector parameters by replacement of the Measuring Head MiniPel
– very short time of calibration.
Three alarm thresholds.
Indication of detector faults.
1.2 Operation principle
Gas detectors are crucial components of any system for gas detection. They are designed for periodical
measurements of gas concentration in ambient air. Information that the settings for concentration
thresholds are e ceeded is shown by means of dedicated light indicators (LEDs) provided on the side wall of
the detector housing (see Figure 1) and transmitted via a digital output line.
Presence of hazardous gases is detected by means of catalytic sensors. Such a solution enables high
insensitivity to variations of ambient conditions, such as temperature, humidity or pressure. The sensor also
distinguishes with high immunity to presence of disturbing chemical compounds (e.g. methane, isobutene
or carbon dio ide), which eliminates occurrence of faked alarms.
Please refer to Appendi [2] for more details about catalytic sensors.
Types of monitored gas and tripping thresholds are specified in its calibration certificate.
Operation of gas detectors consists in periodical measurements of hazardous gases in their vicinity with
continuous averaging of measurement results. Momentary concentration of gases are measured with the
time period of 1 second and average concentrations are calculated. These measurements enable reporting
of warnings or alarms:
Conditions for Alarm 1 and Alarm 2 are established against average concentration for the most
recent one minute.
Alarm 3 is generated when any momentary concentration e ceeds the threshold limit.
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Depending on results of the foregoing actions the system may adopt various statuses that are described in
subsequent paragraphs.
1.2.1 Operation
It is the status when the gas detector is in sound working conditions and takes regular measurements.
Measurement results for the monitored gas still remain below threshold limits and no irregularities in
operation of the equipment are detected. The detector needs no particular attention of personnel beside:
regular and frequent verification of indications, preferably under daily basis,
periodical inspection and calibration (see Section 7.7.1).
1.2.2 Alarm 1 (threshold 1) / Alarm 2 (threshold 2)
It is the device status when only slight concentrations of hazardous gases are detected and advising the
personnel is needed.
Under such circumstances the operator should undertake the following actions:
check possible reasons that may include:
• appearing of gas in facilities monitored by the system,
• interference of the detector operation by foreign substances (e.g. solvents of high
concentration or fuel fumes) – such substances must be e pelled from monitored facilities,
• of the null point. Therefore detectors must be regularly calibrated, otherwise the warning
threshold may offset to the area of pure air, i.e. the situation when competent inspectors have
checked by means of appropriate instruments that no gas or interfering substances are present
at the facilities.
1.2.3 Alarm 3 (threshold 3)
This status is adopted when concentration of hazardous gases e ceeds the third threshold during the time
period longer than one minute. If so, the necessary actions shall include:
evacuation of third persons from the endangered area,
if possible, enable ventilation of endangered confined spaces, e.g. open windows and doors
(unless the control unit automatically switched the ventilation system on).
1.2.4 Failure
In parallel to measurements of gas concentration the detector carries out a series of self-test measurements
to verify fault-free operation of the sensor and the gas monitoring system as a whole.
The defects indicated by the gas detectors may include:
problems with built-in gas sensors,
error of communication with the control unit.
1.2.5 Warm – up
After power on the detector need some time to stabilize operation parameters of sensors. It is the time
period when no measurements are taken. Such a warm-up procedure takes about two minutes and the
detector starts normal operation.
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2 Safety
Do never install gas detectors at locations e posed to direct effect of water (moisture) or
direct sunlight.
When defects are revealed switch the detector off, secure connection cables and contact
maintenance staff or a service team.
Despite the power supply voltage for the Gas Safety System is off, dangerous voltage may
persist across terminals of the Control Unit. Such a voltage may come from another system
controlled by the same unit, for instance ventilation, that use one output pin of the Control
Unit.
The gas detector must be reliably secured during any repair, installation or maintenance
works.
Before painting the facility walls make sure that the device is properly secured against
unintentional painting or paint splashing.
Before painting the facility floor make sure that the device is properly secured against
unintentional painting or paint splashing.
Before use of silicon or silicon-based materials (paints, adhesives, sealant, etc.), make sure
that the device is properly secured against unintentional coating.
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3 Description of the construction
Figure 1: The construction of the device and its dimensions
4 Input-output interfaces
4.1 Electric interface
Locations and arrangement of terminal blocks is shown on Figure 1.
Port designation Name Terminal Description
X1 TETA BUS Teta Bus port. Parameters – see section 8
Supply / signal line
Supply / signal line
Table 1: Electric connections
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Measuring
head
Mounting
holes
Configuration
buttons
Terminal blocks
Optical
control
Display
Service
interface
Locking
screw
Place of application
of the magnet

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5 User interface
5.1 Indication of the device status
Gas detectors are provided with LED indicator to show status of the device. This LED is located on the
bottom of the device housing (see Figures 1).
It is also possible to adjust light intensity of LEDs designed to indicate normal operation of the device (see
details in Section 7.5.2).
Table 2 summarizes how status of the gas detector is indicated by means of individual LEDs.
LED indication
Detector status
Operation mode
Related to
measurement line
Not related to the
measurement line
1Warm – up - Start – up of the detector
OK OK Regular operation of the detector, gas
concentration below the established
thresholds
2
Alarm 1 OK Alarm 1
Alarm 2 OK Alarm 2
Alarm 3 OK Alarm 3
Failure OK Failure – defect of the measuring
detector
OK Failure Normal operation of the detector,
gas concentration below the
established thresholds. The
detector also indicates that there
are no interrogation from a control
unit or a detector defect not
related to the measurement line –
see details in Section 7.6
2
Alarm 1 Failure Alarm threshold 2 is e ceeded. The
detector also indicates that there
are no interrogation from a control
unit or a detector defect not
related to the measurement line –
see details in Section 7.6
Alarm 2 Failure Alarm threshold 3 is e ceeded. The
detector also indicates that there
are no interrogation from a control
unit or a detector defect not
related to the measurement line –
see details in Section 7.6
1 G – green, Y – yellow, R – red.
2 Low intensity of light– L.
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YY
G Y R G Y R
GG
G
RR
R R R R
RRRR R R
Y Y GG Y Y GG Y YY Y
Y YY Y Y YY Y
G G
RY YR Y YY Y
RY YR RR Y YY Y

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LED indication
Detector status
Operation mode
Related to
measurement line
Not related to the
measurement line
Alarm 3 Failure Alarm threshold 3 is e ceeded. The
detector also indicates that there
are no interrogation from a control
unit or a detector defect not
related to the measurement line –
see details in Section 7.6
Failure Failure Detector defect. The detector also
indicates that there are no
interrogation from a control unit or
a detector defect not related to the
measurement line - see details in
Section 7.6
Table 2: Indication of the gas detector operation modes
5.2 Display
On the bottom of the device enclosure comprises also a display module (see Figure 1). The display panel is
designed to show information that is e plained in subsequent sections.
5.2.1 Detector address
The detector address can be displayed with no need to open the device enclosure, it is just enough to
approach a permanent magnet to a specific location on the housing (this location is shown in Figure 1).
Depending on the operation mode of the detector the following details are displayed:
regular operation of the detector – the display presents sequentially the detector address (Ad), its
setting and tE,
failure or warm-up – the sequence of address (Ad) and setting.
The device address can be also displayed by means of configuration buttons.
5.2.2 Information about tests /simulations
The configuration buttons can be also used to display details related to operation modes of the detector
(HE) - see more in Section 7.7.3.
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YY Y Y Y YY Y
RRY YR R RR Y YY Y

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6 System architectures
6.1 Data bus architecture
In this system gas detectors are connected to the bus via T-connectors S2.
Figure 2: Arrangement of gas detectors according to the data bus architecture
Detailed schematic diagrams in an editable format can be found on our
website.
7 Life cycle
7.1 Transportation
The device can be shipped in the same way as new equipment of that type. If the original package or
another protecting means (e.g. corks) is unavailable the conveyed equipment must be secured against
shocks, vibrations or moisture by means of adequate methods and material at the own responsibility of the
sender.
The device can be conveyed under environmental conditions as described in Table 5.
7.2 Installation
7.2.1 Deployment of gas detectors
Deployment of gas detectors must be determined by the system designed with consideration to the
following rules:
installation of detectors is recommended somewhere 30 cm below the topmost point of the
ceiling – methane is lighter than air and tends to migrate upwards,
detectors should me mounted at locations where gathering (accumulation) of gas is e pected due
to architectural properties of the facility (e.g. in the facility part that is separated from the entire
space by means of walls or other structural components),
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Teta
MOD Control 1
Teta
EcoTerm
Teta
EcoWent
Teta
MiniDet
Teta
EcoDet

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detectors must not be e posed to direct effect of water (moisture) or other chemicals (e.g.
cleaning chemicals when the facilities are being cleaned), as well as to direct effect of sunlight,
rain or wind,
detectors must be secured against damaging mechanical impacts,
locations of detectors must enable easy checks and adjustments as well as replacement or
disconnection of each detector.
7.3 Mechanical mounting of detectors
Mounting of gas detector is allowed only after full completion of all civil engineering works.
Spring clamps of terminal blocks are released by depression of the button with a screwdriver.
Detectors must be fi ed by means of mounting holes that are visible after opening of the housing.
Make sure that the gas inlet looks downwards. Dimensions of the housing, arrangement of
mounting holes and layout of internal components is shown in Figure 1. Drilling of mounting holes
in walls or other permanent structures is easier with use of a drilling pattern attached to the
device package.
7.3.1 Electric net ork
The electric network must be deployed according to the engineering documentation.
The electric system must be designed in conformity to general rules for engineering of A&C3.
Electric cables and conductors shall be routed in a safe manner to have then protected
against possible damage.
When two conductors are to be connected to a single terminal clamp of the device they must be
encapsulated first within a common clamping bushing (lug) – see details in Table 5.
Combining two or more wires at a single terminal is not allowed if such wires are not
clamped in a common cable lug.
Do never leave spare lengths of cables inside the device. Bare wires or wires surplus may
lead to a hazard of electric shock or equipment damage.
3 Automation and Control Systems
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Do never leave redundant cable cores not terminated inside the device.
Incorrect routing of cables may result in impairment of the equipment immunity to
electromagnetic interferences.
Figure 3: An example of cable termination inside a gas detector
7.3.2 Types of suitable cables and conductors
Connection type Recommended cable type Example of a suitable cable
designation
Connections between T-connectors and gas
detector
Two-core cable YDY 2 1 mm2
Table 3: Types of suitable cables
7.4 Commissioning of the gas monitoring system
After having the electric network complete and power voltage supplied to all devices carry out the following
operations:
assign addresses to all detectors (see details in section 7.5.1),
configure the control unit (see User Manual for the Teta MOD Control 1 Unit),
simulate generation of alarms signals S1 – see details in section 7.7.3.2,
make sure that the system works according to the underlying logic flow chart – e ecute a test of
safety functions – see details in section 7.7.3.3.
If any civil engineering or building (finishing) jobs could have been performed yet after
installation of the Gas Safety System a test of all detectors is mandatory to make sure that
detectors correctly respond to presence of hazardous gases.
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IncorrectCorrect

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In case of improper operation of the system recheck all wiring and connections or contact
the system provider /equipment manufacturer.
The gas monitoring system can be approved for operation only after passing results of all
aforementioned checks and verifications.
7.5 Configuration of gas detectors
Reliable operation of gas detector needs preliminary configuration of the device parameters. The
configuration is performed with the use of two buttons (CONFIG) that are available after opening of the
device housing (see Figure 1). These buttons enable also displaying of the detector settings.
Information about the detector settings is displayed on bottom wall of the device housing (see Figure 1).
7.5.1 Assigning addresses to gas detectors
Depress the arrow buttons  (see Figure 1) and hold them about one second to enter the mode of
address assignment (the ‘Ad’ message appears on the device display). Release the buttons with the ‘Ad’
message active and the message starts blinking slowly – the desired address can now be set by means of
the arrow buttons . Finally, depress the both arrow buttons  simultaneously to confirm the address
and store it into the device (the setting continues blinking for about two seconds). Finally, the device quits
the procedure of address assignment.
Should the selected address is not confirmed and stored, the old address remains intact and after 15
seconds the detector quits the mode of address assignment.
The default address is 99.
7.5.2 Adjustment of light intensity
Intensity of light indicators can be adjusted according to local conditions at the facility where the system is
operated.
The way how detector status is indicated according to the settings of the light intensity is e plained in
Table 2.
Simultaneous depressing of the arrow buttons (see Figure 1)and holding them about two seconds
makes it possible to enter the mode of light intensity adjustment (the ‘Li’ message appears on the device
display). Releasing of the buttons with the ‘Li’ message active leads to slow blinking of the ‘Li’ message and
the desired intensity of indicator lights can be adjusted by means of arrow buttons:
H stands for high intensity of light (recommended for rooms or confined areas substantial height),
L stands for low intensity of light (recommended for small room, such as boiler houses),
Upon completion of the adjustment procedure depress the both arrow buttons simultaneously to
confirm the settings (the setting continues blinking for about two seconds) and the device quits the
procedure of parameter adjustment.
7.6 Troubleshooting
When a detector reports problems with its operation (see Table 2) the information about a reason for
malfunctioning of the detector is provided by means of the supervising control unit (see the relevant
Operation Manual for the control unit). If communication with the detector is the point, the possible reason
should be sought with the use of guidelines summarized in Table 4.
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LED indication Possible reason for the problem
Indications according to the sequence
of indicator LEDs illustrated in Table 2
(self-test status – failure)
Defective T-connector of S2 type of improper (mismatched) connections
at locations indicated on the drawing below:
No requests from the Control Unit – the control unit is configured with
insufficient number of gas detectors
Poor quality of electric connection (high level of interferences)
Improper power voltage for the detector
Table 4: Possible reasons for error signals
7.7 Maintenance schedule
Each user must be aware of the fact that operation of any gas monitoring system leads to inevitable ageing
of equipment, in particular gas sensors, due to detrimental impact of environmental factors. Therefore the
systems must undergo regular and scheduled maintenance.
Maintenance operations shall include:
calibration of gas detectors,
replacements of fast-wearing parts,
scheduled inspections.
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7.7.1 Calibration
Gas sensor incorporated into the device is a component that subject to ageing due to environmental
factors, which inevitably leads to deterioration of its sensitivity.
To compensate the deterioration effect the gas detectors must be calibrated on the regular basis
(calibration frequency is specified in the Calibration Certificate – see Table 5) by authorized personnel of the
equipment manufacturer. The calibration procedure can be carried out in several manners:
dismounting of the gas detector to send it to the manufacturer for calibration,
removing only sensor plates to send them to the manufacturer for calibration (see Section
7.7.2.1),
sending a request to authorized service team of the manufacturer to come and calibrate the
detectors on site.
7.7.2 Replacement of fast earing parts
Please refer to Table 6 for the recommended lifetime and replacement schedule of fast wearing parts.
7.7.2.1 Replacement of Measuring Head MiniPel
Operation of gas detector leads to natural deterioration of metrological parameters of gas sensors. That
effect can be compensated by regular and scheduled adjustment of the detector indication up to the
moment when the sensor is completely e hausted and must be replaced. It is assumed that replacement of
a gas sensor should take place when its sensitivity drops below 50% of the initial one.
Replacement of a sole sensor is infeasible. The replaceable unit is the whole submodule – the measuring
head – see Table 6.
To replace the head proceed in the following way:
switch off the power voltage for the gas detector,
loosen the locking screw (see Figure 1)
disconnect the measuring head from its socket,
reconnect a new head,
switch on the power voltage for the gas detector.
7.7.3 Test / simulation
Tests of the gas monitoring systems are necessary to make sure that the gas monitoring system is in sound
operating condition. Please contact the equipment manufacturer in case of any irregular response of gas
detectors.
The following tests can be distinguished:
tests with the use of a standardized gas – test gas is supplied to inlet of the gas detector – the
message ‘tE’ should appear on the device display,
simulation of alarms for NG concentration – the ‘S1’ message should appear on the device display,
test of safety functions.
7.7.3.1 Test ith standardized gas
Upon making sure that the detectors is operable it is possible to carry out a test of its parameters to confirm
its performance.
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Test mode is initiated by approaching a permanent magnet to the detector, the display shows the ‘Ad’
message, the detector address stored in its memory and the ‘tE’ message.
Test mode is quitted upon removing of the magnet or within five minutes after test initiation.
The location where the magnet is to be approached is shown in Figure 1.
Test of gas detector with the use of standardized gas is initiated after supplying test gas with specific
concentration to the detector inlet with observation of the detector response (correct indication that alarm
thresholds for NG is e ceeded).
Tests assume that momentary concentration of the test gas are measured and alarms are generated
without any delay.
Correct e ecution of the test needs application of a calibration kit with the standardized
reference gas – methane with concentration of 30 – 40% LEL (see Table 7).
Unauthorized tests of gas detectors when gas with unknown composition and concentration
is supplied to the detectors is prohibited. Under such circumstances the gas sensor can be
damaged, which leads to loss of the detector calibration.
7.7.3.2 Simulation of alarms for NG gas (S1)
Simultaneous depressing the arrow buttons  (see Figure 1) and holding them depressed for about three
seconds switches the detector over to the simulation mode for NG gas (S1). Z Releasing of these buttons in
the simulation mode initiates consecutive simulation of alarms for NG concentration.
The simulation makes it possible to check response of input relays at the Control Unit. In case of no
response or improper operation of the Control Unit it must be inspected with correction of erroneous
connections, if any. Contact the equipment manufacturer if the subsequent simulation, after making
corrections, is also unsuccessful.
The simulation mode (S1) is quitted automatically after the simulation is completed or upon depressing any
of the arrow buttons .
7.7.3.3 Test of safety functions
E ecution of the test for safety functions is recommended once a year. Test gas is supplied to one unit of
each detector type and response of all components within the Gas Safety System is checked together with
all collaborating systems (e.g. ventilation, signalling or cutting off the gas supply).
Test of safety function must be e ecuted without approaching of a magnet to gas detector or
initiation of alarm simulations.
7.7.4 Maintenance
The only manner of cleaning the device is to wipe it with a damp soft cloth. Agents containing solvents,
petrol or alcohols cannot be used to clean the detector
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7.8 Utilization
This symbol on a product or on its packaging indicates that the product
must not be disposed of with other household waste. Instead, it is the
user's responsibility to ensure disposal of waste equipment by handing it
over to a designated collection point for the recycling of waste electrical
and electronic equipment. The proper recycling of your waste equipment
at the time of disposal will help to conserve natural resources and ensure
that it is recycled in a manner that protects human health and the
environment. Information about relevant designated collection points can
be obtained from the Local Authority, waste disposal companies and in the
place of purchase. The equipment can also be returned to the
manufacturer.
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8 Technical specification
Power supply
• VCC
• Power consumption
12 – 50 V
1.8 W
Environment In-operation Storage
• Ambient temperatures
• Humidity
• Pressure
-20 – 50OC
10 – 90% long term
0 – 99% short term
1013 ± 10% hPa
0 – 50OC
30 – 90% long term
Detected substance Methane (CH4)
Measuring range 50% LEL
IP IP 43
Digital communication parameters
• Communication protocol Teta BUS
Integrated signalling equipment (visual) LED controls
7-segment LED display
Protection class III
Dimension See figure 1
Cable glands (cable diameter range) Gland pressed into the installation pipe – diameter of the pipe
16 mm. Glands multiband – diameter of wire 3.5 – 12 mm
Acceptable cable cores 0.2 – 2.5 mm2 – solid wire
0.2 – 2.5 mm2 – stranded cores
Enclosure material ABS
Weight 0.3 kg
Lifetime -
Mandatory periodic inspection Every 12 months (Calibration Certificate validity)
Lifetime of consumables See table 6
Mounting 4 holes for the pin with diameter 4 mm, hole spacing see
figure 1
Table 5: Technical specification
9 List of consumables
No. Consumables Lifetime Manufacturer Product code
{1} Measuring head MiniPel Up to 5 years4Atest Gaz PWS-016-NG
Table 6: List of consumables
4 In case of installation in dwelling houses, public access buildings, car parks or garages
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10 List of accessories
Product code Description
PW-112-S2 T-connector S2
PW-064-WM1 Mounting bracket WM1 (for wall-mounted installation)
PW-064-WM2 Mounting bracket WM2 (for installation under the ceiling)
PW-092-B Calibration kit
- Standardized reference gas – methane CH4 with concentration
40% LEL
Table 7: List of accessories
11 Product marking
Product code Device
PW-113-NG Gas Detector Teta EcoTerm
Table 8: Method of product's marking
12 Appendices
[1] DEZG121-ENG – EC Declaration of Conformity – Teta EcoDet, Teta EcoN, Teta EcoTerm, Teta
EcoWent, Teta MiniDet
[2] PU-Z-054-ENG – Parameters of gas detectors with catalytic sensor
[3] PU-Z-039-ENG – Classification of chemicals used at Atest Gaz
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