MSR ELECTRONIC PolyGard 2 SC2 Manuale utente

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

September 07, 2022 – Revision

Toxic (E-), Combustible (P-) and Infrared (I-CO2) Gases

PolyGard®2 SC2 & AT6 Sensors

User Manual

May 2022

This page intentionally left blank

Table of Contents

1 General................................................................................................................................... 5

1.1 Intended Use...........................................................................................................................................5

1.2 Safety........................................................................................................................................................5

1.3 Installers‘ and Operators‘ Responsibilities......................................................................................5

1.4 Services ....................................................................................................................................................6

1.5 Limited Warranty ...................................................................................................................................6

1.6 Part Disposal ...........................................................................................................................................6

2 Functional Description ........................................................................................................... 6

2.1 General .....................................................................................................................................................6

2.2 Measuring Mode.....................................................................................................................................6

2.3 Special Mode...........................................................................................................................................6

2.4 Sensor Element.......................................................................................................................................7

A: Catalytic Sensor Element (Pellistor) for Combustible Gases ...............................................7

B: Electrochemical Sensor Element for Toxic Gases and Oxygen ............................................7

C: Semiconductor Sensor Element for Freon Gases, Ethylene and Ammonia.......................8

D: Infrared Sensor Element for Methane, Propane and Carbon Dioxide................................8

3 Installation ............................................................................................................................. 9

3.1 Mounting Instructions...........................................................................................................................9

3.2 Mounting of Sensors .......................................................................................................................... 10

4 Electrical Connection ........................................................................................................... 11

4.1 Plug Connection (SC2) in DT6, DC6, SGC6, SCM6 ....................................................................... 11

4.2 Terminal Connection (AT6)............................................................................................................... 11

4.3 Registration of the Sensors SC2/AT6............................................................................................. 11

5 Commissioning..................................................................................................................... 12

5.1 General .................................................................................................................................................. 12

5.2 Required Instruments for Commissioning (Calibration)............................................................ 12

6 Calibration............................................................................................................................ 12

6.1 Run-in Time .......................................................................................................................................... 13

6.2 Calibration Work ................................................................................................................................. 14

6.2.1 Zero Calibration.................................................................................................................... 14

6.2.2 Gain Calibration.................................................................................................................... 14

6.2.3 Calibration (Gain) with Surrogate Gas for Catalytic Sensor Element (Pellistor)... 15

6.2.4 Extended Calibration for Semiconductor Sensor Element ........................................ 15

6.3 Calibration Analog Output................................................................................................................ 15

6.4 Exchange of Sensors .......................................................................................................................... 16

6.4.1 Sensor SC2............................................................................................................................. 16

6.4.2 Sensor AT6............................................................................................................................. 16

6.4.3 Perform Function Test......................................................................................................... 16

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

Speciﬁcations subject to change without notice. | GA_MC2_SC2_E, 2022-05-31 | USA 220907 | Page 3of 28

SC2-AT6 – UserManual

7 Inspection and Service.......................................................................................................... 17

7.1 Inspection ............................................................................................................................................. 17

7.2 Service and Calibration ..................................................................................................................... 17

8 Troubleshooting................................................................................................................... 18

8.1 Indications for the SC2 ...................................................................................................................... 18

8.2 Indications for the AT6 ...................................................................................................................... 18

9 Specifications....................................................................................................................... 18

9.1 General .................................................................................................................................................. 18

9.2 Digital Sensor SC2 .............................................................................................................................. 19

9.3 Analog Sensor AT6.............................................................................................................................. 19

9.4 Sensor Element.................................................................................................................................... 20

A: Catalytic Sensor Element (Pellistor) for Combustible Gases ............................................ 20

B: Electrochemical Sensor Element for Toxic Gases and Oxygen ......................................... 20

C: Semiconductor Sensor Element for Freon Gases, Ethylene and Ammonia.................... 23

D: Infrared Sensor Element for Methane, Propane and Carbon Dioxide............................. 24

10 Figures.................................................................................................................................. 25

List of Abbreviations .............................................................................................................. 26

Glossary..................................................................................................................................... 27

Revision List............................................................................................................................. 27

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

Speciﬁcations subject to change without notice. | GA_MC2_SC2_E, 2022-05-31 | USA 220907 | Page 4of 28

SC2-AT6 – UserManual

1 General

It is important to read this user manual thoroughly and clearly in order to understand the information

and instructions. The PolyGard®2 devices must be used within product specification capabilities.

Due to on-going product development, MSR-Electronic GmbH | INTEC Controls reserves the right to

change specifications without notice. The information contained herein is based upon data

considered to be accurate. However, no guarantee is expressed or implied regarding the accuracy

of these data.

1.1 Intended Use

The PolyGard®2 sensors are designed for the measurement of combustible, toxic gases and oxygen

as well as of refrigerants.

The digital PolyGard®2 SC2 sensor can only be operated in conjunction with the sensor boards on

DT6, DC6, SGC6, and SCM6 of the PolyGard®2 series, as the SC2 sensor is supplied with 5 V DC

by the sensor board and the data is transmitted digitally to the sensor boards via the local

bus. The SC2 is mounted on the housing of the sensor board.

The analog PolyGard®2 AT6 sensor is operated with 24 V DC and outputs an analog 4–20 mA stand-

ard signal. The individual AT6 sensor head can be mounted on all sensor boards with analog

input, or remotely on its own housing.

The PolyGard®2 sensors must not be used in potentially explosive atmospheres. The sensor must

only be employed in areas within the environmental conditions as specified in the Technical Data.

1.2 Safety

The operating instructions must be carefully read and followed by all persons who install, use,

maintain and check the product. The product can only fulfil its intended functions if it is installed,

used, maintained, serviced and checked in accordance with the instructions provided by MSR-

Electronic GmbH | INTEC Controls.

1.3 Installers‘ and Operators‘ Responsibilities

It is the installer’s responsibility to ensure that all PolyGard®2 devices are installed in compliance

with all national and local codes and OSHA requirements. Installation should be implemented only

by technicians familiar with proper installation techniques and with codes, standards and proper

safety procedures for control installations and the latest edition of the National Electrical Code

(ANSI/NFPA70).

The equipotential bonding required (also e.g. secondary potential to earth) or grounding measures

must be carried out in accordance with the respective project requirements. It is important to ensure

that no ground loops are formed to avoid unwanted interference in the electronic measuring

equip-ment.

It is also essential to follow strictly all instructions as provided in the user manual.

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

Speciﬁcations subject to change without notice. | GA_MC2_SC2_E, 2022-05-31 | USA 220907 | Page 5of 28

SC2-AT6 – UserManual

1.4 Services

It is recommended to check the PolyGard®2 devices regularly. Due to regular maintenance any per-

formance deviations may easily be corrected. Re-calibration and part replacement in the field may

be implemented by a qualified technician and with the appropriate tools. Alternatively, the easily

removable plug-in sensor with the sensor element may be returned for service to INTEC Controls.

1.5 Limited Warranty

MSR-Electronic GmbH | INTEC Controls warrants the PolyGard®2 sensors for a period of one (1) year

from the date of shipment against defects in material or workmanship. Should any evidence of

defects in material or workmanship occur during the warranty period, MSR-Electronic GmbH |

INTEC Controls will repair or replace the product at their own discretion, without charge. This

warranty does not apply to units that have been altered, had attempted repair, or been subject to

abuse, accidental or otherwise. The warranty also does not apply to units in which the sensor

element has been overexposed or gas poisoned. The above warranty is in lieu of all other express

warranties, obligations or liabilities.

This warranty applies only to the PolyGard®2 devices. MSR-Electronic GmbH | INTEC Controls shall

not be liable for any incidental or consequential damages arising out of or related to the use of the

PolyGard®2 devices.

1.6 Part Disposal

Within the EU, in accordance with Directive 2012/19/EU, the device must not be

disposed of as municipal waste. Return the device for disposal to your national sales

organization, which you can contact if you have any questions about disposal.

Outside the EU, you have to consider the corresponding directives.

2 Functional Description

2.1 General

The Sensor includes a µController for measurement value processing in addition to the gas sensor

element and the measuring amplifier. All data and measured values of the sensor element are stored

in a fail-safe way in the µController and are transferred via the digital interface to the sensor board.

The calibration management is also integrated in the µController (microprocessor) of the sensor.

The sensor SC2 is connected to DT6, DC6, SGC6, or SCM6.

The sensor AT6 works according to the same principle as the SC2 series with the exception that the

AT6 outputs an analog signal of 4–20 mA (2–10 V as an option).

2.2 Measuring Mode

See description of the DT6, DC6, SGC6, SCM6 devices

2.3 Special Mode

See description of the DT6, DC6, SGC6, SCM6 devices

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

Speciﬁcations subject to change without notice. | GA_MC2_SC2_E, 2022-05-31 | USA 220907 | Page 6of 28

SC2-AT6 – UserManual

2.4 Sensor Element

A: Catalytic Sensor Element (Pellistor) for Combustible Gases

The integrated sensor works according to the catalytic bead principle. The ambient air to be moni-

tored diffuses through the opening into the sensor. Here the combustible gases and vapours are

burned catalytically at a heated detector (Pellistor). The resulting combustion heat also heats up the

detector. This heating changes the resistance of the detector which is proportional to the concentra-

tion of the combustible gases.

In addition to the catalytic detector, the sensor also has a similarly heated inactive compensator.

Both components are part of a Wheatstone measuring bridge. Environmental influences such as tem-

perature, air humidity or thermal conductivity of the ambient air to be monitored affect both com-

ponents to the same extent so that these influences have no significant effect on the measuring

signal.

The ageing process is accelerated by the high temperatures that occur during the combustion of the

measuring gas. Therefore, a calibration of Zero and Gain must be carried out at regular intervals (see

chapter 6).

For testing the sensor, do not use a lighter. If gassed with a lighter the sensor is unusable for meas-

urement. The warranty expires by gassing with a lighter.

B: Electrochemical Sensor Element for Toxic Gases and Oxygen

The sensor element is a sealed electro-chemical cell with 3 electrodes, sensing, reference and coun-

ter or with 2 electrodes, sensing and reference. The ambient air to be monitored diffuses through a

membrane filter into the sensor element. The chemical process of the measurement is based on a

redox reaction creating a flow of electrons that leads to a DC microampere signal between the sens-

ing and reference electrodes. This signal is linear to the volume concentration of the sensed gas. The

signal is evaluated by the connected amplifier and transformed into a linear output signal.

Electrochemical processes always lead by-and-by to a loss of sensitivity. Therefore, regular calibra-

tion of zero-point and gain is necessary. See chapter 6.

There is a small quantity of corrosive liquid in the sensor element. If in case of damage

persons or objects touch the liquid, you have to clean the affected areas as fast and care-

fully as possible with tap water. Out of use sensors must be

disposed in the same way as

batteries.

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

Speciﬁcations subject to change without notice. | GA_MC2_SC2_E, 2022-05-31 | USA 220907 | Page 7of 28

SC2-AT6 – UserManual

C: Semiconductor Sensor Element for Freon Gases, Ethylene and Ammonia

Semiconductor gas sensors (metal oxide sensors) are electrical conductivity sensors. The resistance

of its sensitive layer changes upon contact with the gas to be detected. The gas then reacts with the

sensor surface. This reaction is reversible in the ideal case. Due to their chemical properties metal

oxide gas sensors are suitable for a wide range of applications and the detection of all reactive gases.

Depending on the materials used and the gases to be detected, common operating temperatures

in the semiconductor sensor are between 300°C (572°F) and 900°C (1652°F). The signal is double

logarithmic to the gas concentration –not linear. The current is evaluated by the subsequent

measuring amplifier and converted into a linear output signal.

Oxidation processes lead by-and-by to an unwanted influence on the alteration of the conductivity.

Therefore, regular calibrations of zero-point (Zero) and gain are necessary (see chapter 6).

Semiconductor sensors are not linear on principle. This means that the sensor would only measure

accurately on the calibrated point and not over the entire measuring range. Therefore, a linearization

is included in our software to improve this behaviour. But since the sensor resistance of a semicon-

ductor elements may be very different, it must be normalized. This can be done via the potentiome-

ter on the PCB. Thus, the different output signals can be changed accordingly and adjusted appropri-

ately.

D: Infrared Sensor Element for Methane, Propane and Carbon Dioxide

The integrated sensor is based on the principle of the infrared absorption of gases and accomplishes

highest requirements concerning accuracy, reliability and economy. The Premium IR Sensor head is

gold-plated inside in addition and therefore offers best performance characteristics in terms of drift,

stability and reproducibility. The sensor technology uses the individual absorption spectrum of the

infrared-active molecule and determines its exact concentration through its accurate, quantitative

analysis. The infrared principle nearly eliminates the cross-sensitivity to other gases.

Due to the measuring principle, these sensors require little maintenance, but MSR | INTEC Controls

recommends regular calibration of the sensors.

For all sensor elements:

Certain substances and gases in the ambient air to be monitored can affect the sensitivity

of the sensor element or destroy the sensor completely. This is called poisoning.

The following are currently known:

•Polymerising substances, such as ethylene oxide, acrylonitrile, butadiene, styrene, silicone

and silicone vapours.

•Corrosive substances, such as halogenated hydrocarbons.

•Catalytic poisons, such as sulphur and phosphor compounds, silicon compounds, metal va-

pours.

•Organic solvents

•Oils and lubricants

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

Speciﬁcations subject to change without notice. | GA_MC2_SC2_E, 2022-05-31 | USA 220907 | Page 8of 28

SC2-AT6 – UserManual

3 Installation

Check the order for completeness and correctness using the delivery papers and unit la-

bels.

Electronics can be destroyed by electrostatic discharge (ESD). Therefore, the installation

work should be done only by persons connected to ground, e. g. by standing on a conduc-

tive floor or by taking appropriate grounding measures (acc. to DIN EN 100015).

3.1 Mounting Instructions

See description of the DT6, DC6, SGC6, SCM6 devices. When

choosing the mounting site please pay attention to the following:

•It is mandatory to comply with the legal requirements for the installation of gas detectors.

•The optimum mounting location may vary depending on the area of application.

•The recommended mounting height depends on the relative gas density of the type of gas

to be monitored.

Depending on the relative gas density (d), the following recommendation applies:

d < 0.90: Mount 0.3–0.5 m (about 1 ft) below the ceiling

0.90 < d < 1.10:

d > 1.10:

Mount at a height of 1.2–1.8 m (5-6 ft) above floor

Mount at a height of 0.3–0.5 m (about 1 ft) above floor

Combustible Gases Chemical Formula LEL (EU) /

% vol

Sensitivity % EU %

(Factor) /Methane

Rel. Gas Density

(Air= 1)

Acetone

(CH3)2CO

2.5

2.00

Ammonia

NH3

0.60

Petrol Vapours

n.d.

Benzene

C6H6

1.2

2.70

Butadiene

C4H6

1.4

1.92

Butyl acetate

C6H12O2

1.2

4.01

Cyclohexane

C6H12

1.0

2.90

Cyclopentane

1.4

2.42

Ethane

2.4

1.05

Ethyl acetate

COOC

2.0

3.04

Ethanol (Ethyl alcohol)

3.1

1.59

Ethylene

2.4

0.97

Iso/n-Butane

C4H10

1.4

2.08

Iso/n-Pentane

C5H12

1.1

2.49

Isobutyl alcohol

C4H10O

1.4

2.55

Isopropyl alcohol

(CH3)2CHOH

2.0

2.07

LPG

n.d.

Methane

CH4

4.4

100

0.56

Methanol

CH3OH

6.0

1.10

Methyl acetate

C3H6O2

3.1

2.56

Methyl ethyl ketone

CH3COCH2CH3

1.5

2.48

n-Heptane

C7H16

0.84

3.46

n-Hexane

C6H14

1.0

2.97

Nonane

C9H20

0.7

4.43

Octane

C8H18

0.8

3.94

Propane

C3H8

1.7

1.55

Propene

C3H6

1.8

1.48

Toluene

1.0

3.18

Hydrogen

4.0

110

0.07

Table 1: Combustible Gases

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

Speciﬁcations subject to change without notice. | GA_MC2_SC2_E, 2022-05-31 | USA 220907 | Page 9of 28

SC2-AT6 – UserManual

Toxic Gases Chemical Formula Rel. Gas Density (air= 1)

Ammonia

NH3

0.60

Chlorine

2.48

Hydrogen chloride

HCl

1.27

Hydrogen cyanide

HCN

0.93

Ethylene

C2H4

0.97

Ethylene oxide ETO

C2H4O

1.56

Formaldehyde

CH2O

1.04

Carbon dioxide

1.53

Carbon monoxide

0.97

Ozone

1.66

Oxygen

1.11

Sulphur dioxide

SO2

2.73

Hydrogen sulphide

H2S

1.19

Nitrogen dioxide

2.80

Hydrogen

0.07

Table 2: Toxic Gases

Freon Gases Group Product Code Calibration Gas Rel. Gas Density (air= 1)

FR % LFL

S2020

Respective Gas

FR02

S2061

R23

FR03

S2063

R1234yf

FR04

S2064

R123

FR06

S2070

R22

FR07

S2077

R134a

FR08

S2080

R407c

Table 3: Freon Gases

•Choose mounting location of the sensor according to the local regulations.

•Consider ventilation conditions! Do not mount the sensor near the airflow (air passages, suc-

tion holes etc.).

•Mount the sensor at a location with minimum vibration and minimum variation in temperature

(avoid direct sunlight).

•Avoid locations where water, oil etc. may influence proper operation and where mechanical

damage might be possible.

•Provide adequate space around the sensor for maintenance and calibration work.

3.2 Mounting of Sensors

The Sensor is supplied in a separate package and should be installed on the housing only during

commissioning to protect it against dirt and damage.

•Check gas type, range and calibration date of the sensor.

•Define installation place on the housing and break out knockouts.

•Tighten the Sensor with M25 hexagon lock nut.

INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | Ph: (858) 578.7887 & (888) GO.INTEC | inteccontrols.com

Speciﬁcations subject to change without notice. | GA_MC2_SC2_E,2022-05-31 | USA 220907 | Page 10 of 28

SC2-AT6 – UserManual

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