MSR ELECTRONIC PolyGard 2 User manual

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
PolyGard2 / µGard2 Sensors for Toxic Gases
Sensor Cartridge for Toxic Gases (and Oxygen)
Series: SC2 and MC2 Series
User Manual
August 2020
Up-to-date data sheets and user manuals can be found in the download area of www.msr-24.com.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 2
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
1Functional Description........................................................................................................................ 3
1.1 General ................................................................................................................................................................. 3
1.2 Measuring Mode................................................................................................................................................. 3
1.3 Special Mode....................................................................................................................................................... 3
1.4 Sensor Element for Toxic Gases and Oxygen.............................................................................................. 3
2Installation.......................................................................................................................................... 4
2.1 Mounting Instructions....................................................................................................................................... 4
3Electrical Connection .......................................................................................................................... 5
3.1 Plug Connection (SC2) in SB2, MSB2, MSC2, WSB2 ................................................................................... 5
3.2 Terminal Connection (MC2)............................................................................................................................. 5
4Commissioning ................................................................................................................................... 5
4.1 Installation of Sensor Cartridge ..................................................................................................................... 5
4.2 Registration of the Sensor Cartridge............................................................................................................. 5
5Calibration .......................................................................................................................................... 6
5.1 Calibration Work ................................................................................................................................................ 6
5.2 Exchange of Sensor Cartridge......................................................................................................................... 7
6Inspection and Service ........................................................................................................................ 8
6.1 Inspection ............................................................................................................................................................ 8
6.2 Service and Calibration .................................................................................................................................... 8
7Troubleshooting ................................................................................................................................. 9
7.1 Indicators at the SC2 ......................................................................................................................................... 9
7.2 Indicators at the MC2 ........................................................................................................................................ 9
7.3 Sensor Board (PCB) ............................................................................................................................................ 9
7.4 Sensor Cartridge (Messages at the Tool / Controller)............................................................................... 9
8Cross-sensitivity Data ....................................................................................................................... 10
9Technical Data................................................................................................................................... 10
9.1 MC2......................................................................................................................................................................10
9.2 Sensor Cartridge (SC2)....................................................................................................................................11
9.3 Sensor Element.................................................................................................................................................12
10 Figures .............................................................................................................................................. 14
11 Part Disposal ..................................................................................................................................... 15
12 Notes and General Information......................................................................................................... 15
12.1 Intended Product Application...................................................................................................................15
12.2 Installers’ Responsibilities ........................................................................................................................15
12.3 Maintenance..................................................................................................................................................15
12.4 Limited Warranty .........................................................................................................................................15

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 3
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
Intended Use
The PolyGard2 sensors (SC2) are designed for the measurement of toxic gases and oxygen in a wide range
of applications only in connection with a basic unit, e.g. SB2, MSC2, MSB2 and WSB2 of the PolyGard2
series.
The MC2 sensor (µGard2) is operated with 24 V DC and outputs an analog 4–20 mA standard signal.
The PolyGard2 / µGard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.
1Functional Description
1.1 General
The Sensor Cartridge 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 digitally transferred via the local bus to the basic unit (PCB). The
calibration management is also integrated in the µController of the Sensor Cartridge.
The Sensor Cartridge SC2 is connected to the SB2 / MSB2 / MSC2 / WSB2.
The µCartridge MC2 works according to the same principle as the SC2 series with the exception that the MC2
outputs an analog signal of 4–20 mA (2–10 V as an option).
1.2 Measuring Mode
See description of the SB2, MSC2, MSB2 and WSB2 devices.
1.3 Special Mode
See description of the SB2, MSC2, MSB2 and WSB2 devices.
1.4 Sensor Element for Toxic Gases and Oxygen
The sensor element is a sealed electro-chemical cell with three electrodes, sensing, reference and counter or
with two electrodes, sensing and reference. The ambient air to be monitored diffuses through a membrane
filter into the liquid electrolyte of the sensor. The chemical process of the measurement is one of oxidation
where one molecule of the target gas is exchanged for one molecule of oxygen. The reaction drives the
oxygen molecule to the counter electrode, generating a DC microampere signal between the sensing 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 calibration of
zero-point and gain is necessary. See section 5.
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 carefully as possible
with tap water. Out of use sensors must be disposed in the same way as batteries.
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
silicon vapours
•Corrosive substances, such as halogenated hydrocarbon.
•Catalytic poisons, such as sulphur and phosphor compounds, silicon compounds, metal vapours
•Organic solvents

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 4
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
2Installation
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 conductive floor or
by taking appropriate grounding measures (acc. to DIN EN 100015).
2.1 Mounting Instructions
See description of the SB2, MSC2, MSB2 and WSB2 devices.
When choosing the mounting site please pay attention to the following:
•The mounting height depends on the relative density of the gas type to be monitored.
Gas type
MSR-Code
Relative density
(air = 1)
Recommended mounting height
(distance to floor / ceiling)
Ammonia
E1125
0.60
Ceiling (0.3 m)
Chlorine
E1193
2.48
Floor (0.2–0.3 m)
Hydrogen chloride
E1186
1.27
Floor (0.2–0.3 m)
Hydrogen cyanide
E1183
0.93
Ceiling (0.3 m)
Ethylene oxide
E1199
1.56
Floor (0.2–0.3 m)
Ethylene
E1189
0.97
1.5–1.8 m
Formaldehyde
E1185
1.04
1.5–1.8 m
Carbon monoxide
E1110
0.97
1.5–1.8 m
Ozone
E1190
1.66
Floor (0.3 m)
Sulphur dioxide
E1196
2.73
Floor (0.2–0.3 m)
Hydrogen sulphide
E1197
1.19
Floor (0.2–0.3 m)
Nitrogen dioxide
E1130
2.80
0.5–1.8 m
Oxygen
E1195
1.11
1.5–1.8 m
Table Mounting Heights
The sensor must be installed at the correct height depending on the relative gas density (d). Normal rule is:
d < 0.95: Mount on the ceiling
0.95 < d < 1.05: Mount at a height of 1.5 –1.8 m above floor
d > 1.05: Mount at a height of 0.3 m above floor
Exception NO2: Mounting height for NO2sensors: 0.5 to 1.8 m above floor!
•Choose mounting location of the sensor according to the local regulations.
•Consider ventilation conditions! Do not mount the sensor near the airflow (air passages, suction
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.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 5
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
3Electrical Connection
3.1 Plug Connection (SC2) in SB2, MSB2, MSC2, WSB2
SC2 sensors are equipped with a reverse polarity protected connector (3-pin). It must not be plugged in
the wrong position by force (already clamped at the factory).
All black plugs are connected in parallel, so it is irrelevant which plug to use.
3.2 Terminal Connection (MC2)
•Open cover.
•Insert field bus cable from above, cut and strip it.
•Connect it to the terminal (only 3-wire connection possible).
•For the 4–20 mA operating mode, please remove the built-in
500 Ωresistor between terminals 2 and 3.
4Commissioning
Only trained technicians should perform the following when commissioning:
•Check for correct mounting location.
•Check if connection is correct.
•Check power voltage (for MC2).
•Install the Sensor Cartridge(s) if not already installed ex works.
•Check Sensor Cartridge connector for correct engagement.
•Calibrate (if not already factory-calibrated).
Within the first weeks after commissioning, there may be a deviation in the sensor behaviour.
Required instruments for commissioning (calibration):
•Service Tool DGC-06 STL or
•PCE06 Software incl. USB/RS-485 communication set:
•Calibration:
▪Test gas bottle with synthetic air (20 % O2, 80 % N)
▪Test gas bottle with test gas in the range of 30–90 % of the measuring range. Rest is synthetic
air.
▪Extraction set consisting of gas pressure regulator and flow meter
▪Calibration adapter with tube, type C2Z4.
4.1 Installation of Sensor Cartridge
The Sensor Cartridge 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 Sensor Cartridge.
•Define installation place on the housing of the basic or remote sensor and break out knockouts.
•Tighten the Sensor Cartridge with M32 hexagon lock nut.
•Plug in the Sensor Cartridge at X2 or X3 of the PCB. Observe plug polarity, the plug must engage.
4.2 Registration of the Sensor Cartridge
Registration and addressing of the field bus address can be read in the User Manual for sensor boards, e.g.
GA_SB2 etc.
0 VDC
Sensor Unit
MC2-X-XXXX
123
+24 V
4-20mA / 2-10V
ooo

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 6
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
5Calibration
The service tool STL06 or PCE06 Software are available for convenient on-site calibration. See description of
Service Tool STL06 or PCE06 Software.
There is also the possibility to exchange the SC against a calibrated SC on site. The used SC can then be
calibrated directly in the office or at the MSR_E Calibration Service and then reused again.
Prior to calibration the Sensor Cartridge must be supplied with power voltage without
interruption for warm-up and stabilisation. The run-in time depends on the sensor element and is
shown in the following table:
Gas type
Formula
Calibration with
replacement gas
(ratio calibration
gas : gas)
Run-in
time for
calibra-
tion (h)
Warm-
up time
(s)
Flow
rate
(ml/
min)
Calibra-tion
interval in
months1
Ammonia
NH3
-
24
300
150
12
Chlorine
Cl2
NO21:1 CL2
24
30
500
6
Hydrogen chloride
HCL
H2S 20:31 HCl
24
30
500
6
Hydrogen cyanide
HCN
H2S 15:25 HCN
24
30
500
6
Ethylene oxide
ETO
-
24
30
150
6
Ethylene
C2H4
24
30
150
6
Formaldehyde
CH2O
CO 7:1 CH2O
24
30
150
6
Carbon monoxide
CO
-
24
10
150
12
Ozone
O3
NO22:1 O3
24
30
500
6
Sulphur dioxide
SO2
-
24
30
150
6
Hydrogen sulphide
H2S
-
24
30
500
12
Nitrogen dioxide
NO2
-
24
60
500
12
Oxygen
O2
-
24
10
150
6 / 12
1Manufacturer-recommended calibration interval for normal environmental conditions
Table Calibration
Please observe proper handling procedures for compressed gas and test gas bottles (regulations
TRGS 220)!
Test gas can be toxic, so never inhale it!
Symptoms: Dizziness, headache and nausea.
Procedure if exposed: Remove victim to fresh air at once, seek medical attention.
5.1 Calibration Work
Prior to calibration you have to activate the mode “Special Mode” at the basic device, only then the
calibration menu is enabled. During the special mode the basic device doesn’t issue alerts.
•Connect calibration adapter carefully to the sensor cartridge.
•Connect calibration tool you want to use to the PCB.
•Select the Sensor Cartridge to be calibrated by selecting the gas type.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 7
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
Zero calibration
•Apply synthetic air (flow rate according to the table "calibration", 1 bar ± 10%) to the Sensor
Cartridge.
•The current zero offset and the offset value of the first calibration is read by displaying.
•When the value is stable, confirm and the new zero offset factor is calculated.
The new offset factor is checked for plausibility and stored in the buffer memory. The current
measured value is output with the new offset factor and the offset display is updated.
•With "Save" the new offset factor is written in the SC memory, only then the Zero calibration has
been successfully completed. If you exit the menu without pressing "Save", the original offset data
for the measured value calculation will continue to be used.
With a zero reading > 10 % of measuring range during the zero calibration, zero calibration is not possible.
Gain calibration
•Enter test gas concentration (value between 30 and 90 % of the measuring range)
•The current sensor element sensitivity is read by displaying.
•Apply test gas (flow rate according to the table "Calibration", 1 bar ± 10%) to the Sensor Cartridge.
•When the value is stable, confirm and the new gain factor is calculated.
The new gain factor is checked for plausibility and stored in the buffer memory. The current
measured value is output with the new gain factor and the sensor element sensibility is updated.
•With "Save" the new gain factor is written in the SC memory, only then the gain calibration has been
successfully completed. If you exit the menu without pressing "Save", the original gain data for the
measured value calculation will continue to be used.
By limiting the gain factor, calibration will not be possible any more when the sensitivity of the sensor
reaches a residual sensitivity of 40 %. Then the Sensor Cartridge has to be replaced
For more information, see the user manual of the corresponding tool.
5.2 Exchange of Sensor Cartridge
Instead of the on-site calibration, the used SC can be replaced simply and conveniently by a calibrated one.
The communication of the local bus (Sensor Cartridge <> PCB) is continuously monitored during
operation and results in an immediate error message on the gas controller in case of fault or
interruption. When replacing the sensor unit, the communication of the local bus is interrupted
when unplugging the SC connector which leads to an immediate triggering of the error
message.
•Disconnect the SC connector from the PCB or the remote PCB (error message will be activated).
•Loosen the locknut.
•Remove used SC.
•Take calibrated SC out of the original packaging, check for gas type, measuring range and valid
calibration date.
•Insert the SC and retighten with lock nut.
•Insert the SC plug into the socket at the PCB or remote PCB. Check plug for proper engagement.
The local bus communication is automatically established and tested. At the same time the gas type and the
measuring range of the "new" SC are compared with the data stored in the PCB. If they match and the
communication is correct, the error message will be automatically acknowledged in the Gas Controller.
The yellow LED of the PCB flashes with a pulse of 1 sec. as long as the SC connector is disconnected
(communication error). After the local bus communication has been re-established and the conformity test
has been successful, the LED goes into flashing mode with 3 sec. pulse duration until the sensor’s warm-up
time is over.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 8
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
Apply a defined gas concentration on the sensor element with the help of the gas generator and check the
measurement signal at the analog output or at the relay outputs.
With this test, the complete function chain “Sensor Element > Sensor Cartridge> Local Bus> PCB> Field Bus>
GC Controller” is tested.
6Inspection and Service
Inspection, service and calibration of the sensor should be done by trained technicians at regular intervals.
We therefore recommend concluding a service contract with MSR or one of their authorized partners.
According to EN 45544-4, inspection and service have to be executed at regular intervals. The maximum
intervals have to be determined and respected by the person responsible for the gas warning system
according to the legal requirements. MSR-E recommends employing the common inspection and service
intervals as specified in the general regulations of the gas measuring technique. We recommend an
inspection interval of 3 months. The recommended calibration intervals depend on the sensor element and
can be read from the table “Calibration”. If there are different intervals, always observe the shortest one.
Inspections and services must be documented. The date for the next maintenance has to be affixed to the
sensor.
6.1 Inspection
Gas sensors should be controlled regularly by a competent person according to EN 45544-4. The following
has to be checked in particular:
•Maintenance/ calibration interval not exceeded.
•Visual inspection of the sensor including cable for damage etc.
•Remove dust deposits, especially at the gas inlet.
•The filter at the gas inlet has to be replaced if extremely dirty.
6.2 Service and Calibration
When performing the maintenance, you have to do the calibration and the functional test, see chapter 5, in
addition to the inspection.
A fixed calibration interval is stored for each sensor type.
SC2 Sensor heads:
If this interval is exceeded, a digital maintenance message is generated and forwarded.
Performing the calibration automatically deletes this message.
MC2 Sensor heads:
If this interval is exceeded, the current output of the MC2 goes to a fixed 19 mA signal. For new devices
(factory calibration), the interval may be exceeded by a factor of 1.5.
After voltage recovery, there is a defined interruption of this message. This can be of use in order to employ
the device without the maintenance message for a few days (adjustable in system parameters -> error time,
value range> 1) until the calibration is repeated.
Performing the calibration automatically deletes this message.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 9
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
7Troubleshooting
7.1 Indicators at the SC2
The SC2 has got no diagnostic indications; they are only available on the PCB of SB2, MSC2, MSB2 or WSB2.
7.2 Indicators at the MC2
The 4–20 mA output of the MC2 can be used as diagnostic indicators.
Output current
Restart: 1 mA
Device error: 2 mA
Tolerable negative sensor drift: 3–4 mA
Normal measurement mode: 4–20 mA
Tolerable overrange: 20–21 mA
Overrange error: > 21 mA
Maintenance message: 19 mA
7.3 Sensor Board (PCB)
Trouble
Cause
Solution
Green LED isn’t on.
Power voltage not applied.
Measure tension at X4:
(16–28 V DC) Pin 1 (+) and 2 (-)
Polarity not correct at X4.
Connect correctly.
Connector X4 not plugged in.
Check the plug.
Wire breakage
Check the wiring.
Green LED doesn’t flash.
PCB: no address
Check PCB address, address
correctly.
PCB: no field bus communication
Check field bus wiring,
topology and termination.
No measured value at the Tool
or Controller
SC not or wrongly plugged in.
Check SC plug.
SC not registered.
Register SC.
SC gas type/measuring range doesn’t
match with registered ones.
Check SC data<> registration
data for conformity.
Message at the Tool / Controller:
- 24 V DC voltage <range>
- 5 V DC voltage <range>
- Temp. <range>
- WatchDog triggered
Internal error
Replace PCB.
7.4 Sensor Cartridge (Messages at the Tool / Controller)
Measuring signal <range>
Internal error
Replace SC.
5 V DC voltage < range >
Temp. < range >
WatchDog triggered
SC Input 1 stored type
Wrong SC type at input 1
Check SC at input 1, replace it.
SC Input 2 stored type
Wrong SC type at input 2
Check SC at input 2, replace it.
SC Input 3 stored type
Wrong SC type at input 3
Check SC at input 3, replace it.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 10
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
8Cross-sensitivity Data
The cross sensitivity depends on the used transmitter type and can be read from the table Technical Data
(see section 9.3). Other gases can have an influence on the sensitivity, too. The table does not claim to be
complete. The indicated sensitivity data are only standard values referring to new sensor elements.
9Technical Data
All specifications were collected under optimal test conditions.
We confirm compliance with the minimum requirements of the applicable standard.
9.1 MC2
ELECTRICAL
Power supply
16–29 V DC, reverse-polarity protect.;
18–27 V AC (only for output signal 2–10 V)
Power consumption
23 mA, max. (0.6 VA for 24 V)
Analog output signal
Proportional, overload and short-circuit proof,
load 500 Ω for current signal, ≥ 50 kΩ for voltage signal
4–20 mA or 2–10 V = measuring range
3.2–4 mA or 1.6–2 V = underrange
> 20–21.2 mA or 10–10.6 V = overrange
2 mA or 1 V = fault
> 21.8 mA or 10.9 V = fault High
SENSOR ELEMENT
Gas type
See Ordering Information
Sensor element
Electrochemical sensor
Pressure range
Atmospheric ± 10 %
Storage temperature range1
0 °C to 20 °C (32°F to 68 °F) or
5 °C to 20 °C (41°F to 68 °F) for NH3, CO, NO2, O2
Storage time
6 months
Poisoning
Electrochemical sensors are susceptible to poisoning by
organic solvents and silicone vapours.
PHYSICAL
Enclosure P (M25)
Polycarbonate UL 94 V2
Colour
RAL 7032 (light grey)
Dimensions
(D x H) 24 x 22 mm (0.94 x 0.87 in.)
Weight
Ca. 30 g (0.066 lb)
Protection class
IP65 (only if mounted in housing type A, D or N)
Mounting
Screw mounting / M25
Wire connection
Screw-type terminal min. 0.25 mm2, max. 1.3 mm2,3-pin,
24 to 16 AWG
REGULATIONS
Directives
EMC directives 2014/30/EU,
CE
Compliance with:
EN 378
EN 45544
EN 50104 (for O2)
EN 50271
EN 50545
EN 61010-1:2010
ANSI/UL 61010-1
CAN/CSA-C22.2 No. 61010-1
Warranty
1 year on sensor (not if poisoned or overloaded),
2 years on device
1A higher storage temperature can have a negative effect on sensitivity and service life.
2 We recommend recalibrating the devices if stocked for a longer period (>8 weeks)

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 11
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
9.2 Sensor Cartridge (SC2)
ELECTRICAL
Power supply
5 V DC from Sensor Board (e.g. SB2/MSB2), reverse polarity
protected
Power consumption:
10 mA, max. (0.05 VA)
Serial interface local bus
1-wire / 19200 Baud
SENSOR ELEMENT
Gas type
See Ordering Information
Sensor element
Electrochemical
Pressure range
Atmospheric ± 10 %
Storage temperature range1
0 °C to 20 °C (32°F to 68 °F) or
5 °C to 20 °C (41°F to 68 °F) for NH3, CO, NO2, O2
Storage time
6 months
Poisoning
Electrochemical sensors are susceptible to poisoning by organic
solvents and silicone vapours.
PHYSICAL
Housing in plastic
Polycarbonate
Combustion
UL 94 V2
Housing colour
RAL 7032 (light grey)
Dimensions: Housing type P
Housing type L
(D x H) 24 x 22 mm (0.94 x 0.87 in.)
(D x H) 24 x 30 mm (0.94 x 1.18 in.)
Weight
Ca. 30 g (0.07 lb)
Protection class
IP65
Mounting
Screw mounting
Connection type
3-pin connector
Cable length
110 mm (4.33 in.)
REGULATIONS
Directives
EMC Directives 2014/30/EU
CE
Conformity to:
EN 378
EN 45544-1
EN 50104 (for O2)
EN 50545
EN 50271
EN 61010-1
ANSI/UL 61010 1
CAN/CSA-C22.2 No. 61010-1
Warranty
1 year on sensor (not if poisoned or overloaded),
2 years on device
1A higher storage temperature can have a negative effect on sensitivity and service life.
2 We recommend recalibrating the devices if stocked for a longer period (>8 weeks)

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 12
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
9.3 Sensor Element
SPECIFICATIONS - Sensor Cartridge (SC2/MC2) / Sensor element
Gas type
Ordering No.
Measuring range
Accuracy
Display resolution
Repeatability
t90 time
Zero-point variation
Drift in air
Temperature range
Humidity range (non- condensing)
Life time1 in air
Relative Gas density2
Calibration interval1
Zero
Gain
SC2-/MC2-
ppm
± %
sig.
ppm
<± %
sig.
≤ sec.
±ppm
< % signal/
month
°C
% r. F.
>
months
Air = 1
Month
NH3
E1125-AX
0–100
5
0.1
10
75
5
1
1
-30 / +50
15–90
24
0.60
12
NH3
E1125-BX
0–300
3
0.1
10
75
5
1
2
-30 / +50
15–90
24
0.60
12
NH3
E1125-CX
0–500
3
0.1
10
75
5
1
2
-30 / +50
15–90
24
0.60
12
NH3
E1125-DX
0–1000
3
1
10
75
10
1
2
-30 / +50
15–90
24
0.60
12
NH3
E1125-EX
0–5000
2
1
10
40
100
1
2
-30 / +50
15–90
24
0.60
12
Cl2
E1193-CX
0–10
n.d.
0.01
5
40
0.2
1
2
-30 / +50
15–90
24
2.48
6
Cl2
E1193-DX
0–20
n.d.
0.01
5
40
0.2
1
2
-30 / +50
15–90
24
2.48
6
HCl
E1186-DX
0–20
5
0.01
5
60
0.5
1
2
-20 / +50
15–90
24
1.27
6
HCN
E1183-BX
0–50
5
0.01
5
30
2
1
2
-20 / +50
15–90
24
0.93
6
HCN
E1183-CX
0–100
5
0.1
5
30
2
1
2
-20 / +50
15–90
24
0.93
6
ETO
E1199-AX
0–10
n.d.
0.01
5
150
1
1
2
+10 / +30
15–90
24
1.56
12
C2H4
E1189-CX
0–200
n.d.
0.1
5
120
5
2
5
-30 / +50
15–90
24
0.97
6
CH2O
E1185-BX
0–10
n.d.
0.01
5
60
0.2
1
2
-30 / +50
15–90
36
1.04
6
CO
E1110-CX
0–150
2
0.1
5
10
4
0.4
0.4
-20 / +50
10–95
72
0.97
12
CO
E1110-EX
0–250
2
0.1
5
10
4
0.4
0.4
-20 / +50
10–95
72
0.97
12
CO
E1110-FX
0–300
2
0.1
5
10
4
0.4
0.4
-20 / +50
10–95
72
0.97
12
CO
E1110-HX
0–500
2
0.1
5
10
4
0.4
0.4
-20 / +50
10–95
72
0.97
12
O3
E1190-AX
0–5
n.d.
0.001
5
60
0.1
1
2
-30 / +50
15–90
24
1.66
6
O3
E1190-BX
0–10
n.d.
0.01
5
60
0.2
1
2
-30 / +50
15–90
24
1.66
6
SO2
E1196-BX
0–20
3
0.01
5
30
0.2
1
2
-20 / +50
15–90
24
2.73
6
H2S
E1197-AX
0–50
3
0.01
5
30
1
1
2
-10 / +50
15–90
24
1.19
12
H2S
E1197-BX
0–100
3
0.1
5
40
1
1
2
-10 / +50
15–90
24
1.19
12
H2S
E1197-CX
0–200
3
0.1
5
40
2
1
2
-10 / +50
15–90
24
1.19
12
H2S
E1197-DX
0–500
3
0.1
5
40
5
1
2
-10 / +50
15–90
24
1.19
12
H2S
E1197-EX
0–1500
3
1
5
60
15
n.d.
n.d.
-10 / +50
15–90
24
1.19
12
NO2
E1130-AX
0–10
5
0.01
2
25
0.2
1
2
-30 / +50
15–90
24
2.80
12
NO2
E1130-BX
0–20
5
0.01
2
25
0.2
1
2
-30 / +50
15–90
24
2.80
12
NO2
E1130-CX
0–30
5
0.01
2
25
0.2
1
2
-30 / +50
15–90
24
2.80
12
NO2
E1130-EX
0–100
5
0.1
2
25
2
1
2
-30 / +50
15–90
24
2.80
12
Vol %
O2
E1195-
A2/3
0–25
2
0.01
n.d.
15
n.d.
n.d.
0.4/
0.6
-40 / +50
5–95
24/36
1.11
6/6
O2
E1195-
A5/7
0–25
2
0.01
n.d.
15
n.d.
n.d.
0.4
-40 / +50
15–90
60/84
1.11
12/12
1Manufacturer-recommended calibration interval for normal environmental conditions
2The sensor must be installed at the correct height depending on the relative gas density (d):
d < 0.95: Mount on the ceiling
0.95 < d < 1.05: Mount at a height of 1.5–1.8 m above floor
d > 1.05: Mount at a height of 0.3 m above floor
Exception NO2: Mounting height for NO2sensors: 0.5 to 1.8 m above floor!
3 Exceeding the measuring range limit will include a risk of damaging the sensor element.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 13
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
CROSS SENSITIVITY1- SENSOR CARTRIDGE (SC2/MC2) / SENSOR ELEMENT
Illustration: Gas concentration of interference gas / reaction of sensor
Gas type
Ordering No.
Chlorine, Cl2
Ethanol, C2H6O
Ethylene, C2H4
Carbon monoxide, CO
Carbon dioxide, CO2
Sulphur dioxide, SO2
Hydrogen sulphide, H2S
Nitrogen dioxide NO2
Nitrogen monoxide, NO
Hydrogen, H2
SC2-
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
NH3
E1125-AX
10/0
100/0
100/0
200/0
5000/0
10/<10
10/<20
20/<2
20/0
1000/-10
NH3
E1125-BX
10/0
100/0
100/0
200/0
5000/0
10/<12
10/<30
20/0
20/0
1000/-150
NH3
E1125-CX
10/0
100/0
100/0
200/0
5000/0
10/<12
10/<30
20/0
20/0
1000/-150
NH3
E1125-DX
10/0
100/0
100/0
200/0
5000/0
10/<12
10/<30
20/0
20/0
1000/-150
NH3
E1125-EX
10/0
100/0
100/0
200/0
5000/0
10/<12
10/<30
20/0
20/0
1000/-150
Cl2
E1193-XX2
300/0
5/0
20/20
35/0
300/0
HCl
E1186-DX
20/0
100/0
1000/0
100/0
20/31
20/-6
25/0
/0
HCN
E1183-XX2
100/0
100/2
20/38
15/25
5/-12
35/0
100/2
ETO
E1199-AX
30/21
100/45
C2H4
E1189-CX
< 60%
CH2O
E1185-BX
10-18%
1-3%
CO
E1110-XX2
2/0
2000/5
5000/0
50/0,5
25/0
50/-1
50/8
100/20
O3
E1190-XX2
5/45/4
100/0
300/0
5/0
20/10
35/0
300/0
SO2
E1196-BX
100/0
100/1
10/0
100/-125
100/0
100/1
H2S
E1197-XX2
100/2
100/20
5/1
35/2
100/20
NO2
E1130-XX2
1/1
100/0
500/0
400/0
5000/0
30/-0,6
20/-25
50/0
1000/0
O2
E1195-XX2
5 Vol %
1The table doesn’t claim to be complete. Other gases, too, can have an influence on the sensitivity. The mentioned cross
sensitivity data are only reference values valid for new sensors.
2Cross sensitivities valid for all measuring ranges of the sensor.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 14
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
10 Figures
v
Fig. 1 Fig. 3
PCB with Sensor Cartridge SC2 connection to PCB
Fig. 2
Calibration adapter C2Z4
X2
X3
X7
X4
94 mm
79 mm
Mounting
Mounting
Mounting
Mounting
115mm
130 mm
180 mm
D = 4 mm

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases
Page 15
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de
11 Part Disposal
Since August 2005 there are EC-wide directives defined in the EC Directive 2002/96/EC and in national
codes concerning the waste electrical and electronic equipment and also regarding this device.
For private households there are special collecting and recycling possibilities. For this device isn’t registered
for the use in private households, it mustn’t be disposed this way. You can send it back to your national sales
organisation for disposal. If there are any questions concerning disposal, please contact your national sales
organisation.
Outside the EC, you have to consider the corresponding directives.
12 Notes and General Information
It is important to read this user manual thoroughly and clearly in order to understand the information and
instructions. The PolyGard®2 / µGard®2 devices must be used within product specification capabilities. The
appropriate operating and maintenance instructions and recommendations must be followed.
Due to on-going product development, MSR-Electronic GmbH 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.
12.1 Intended Product Application
The PolyGard®2 / µGard®2 devices are designed and manufactured for control applications and air quality
compliance in commercial buildings and manufacturing plants.
12.2 Installers’Responsibilities
It is the installer’s responsibility to ensure that all PolyGard®2 / µGard®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 equipment.
It is also essential to follow strictly all instructions as provided in the user manual.
12.3 Maintenance
It is recommended to check the PolyGard®2 / µGard®2 devices regularly. Due to regular maintenance any
performance 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 cartridge with the sensor element may be returned for service to MSR-Electronic GmbH.
12.4 Limited Warranty
MSR-Electronic GmbH warrants the PolyGard®2 / µGard®2 devices 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 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 / µGard®2 devices. MSR-Electronic GmbH shall not be liable for
any incidental or consequential damages arising out of or related to the use of the PolyGard®2 / µGard®2
devices.