MSR PolyGard 2 SC2 Series User manual

PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
PolyGard2 / µGard2 Sensors
Sensor Cartridge for Toxic Gases and Oxygen
Series: SC2 and MC2 Series
User Manual
June, 2018

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases and Oxygen
Page 2
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
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, MGC2.....................................................................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 Basic Sensor Board..........................................................................................................................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 and Oxygen
Page 3
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
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 the basic units SB2, MSC2 and MSB2 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.
1 Functional 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 Sensor Board. The
calibration management is also integrated in the µController of the Sensor Cartridge.
The Sensor Cartridge SC2 is connected to the SB2 / MSB2 / MSC2.
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 and MSB2 devices.
1.3 Special Mode
See description of the SB2, MSC2 and MSB2 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.
Corrosive substances, such as halogenated hydrocarbons.
Catalytic poisons, such as sulphur and phosphor compounds, silicon compounds, metal vapours.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases and Oxygen
Page 4
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
2 Installation
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 and MSB2 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
Relativ density
(air = 1)
Recommended mounting height
(distance to floor / ceiling)
Ammoniak
E1125
0.59
Ceiling (0.3 m)
Chlor
E1193
2.40
Floor (0.2 - 0.3 m)
Fluorwasserstoff
E1182
0.71
Ceiling
Cyanwasserstoff
E1183
0.93
Ceiling (0.3 m)
Chlorwasserstoff
E1186
1.25
Floor (0.3 - 0.8 m)
Ethylen
E1189
0.97
1.5 –1.8 m
Fluor
E1198
1.31
Floor (0.2 - 0.3 m)
Formaldehyd
E1185
1.09
Floor (0.3 - 0.8 m)
Kohlenmonoxid
E1110
0.97
1.5 –1.8 m
Ozon
E1190
1.66
Floor (0.3 m)
Phosphin
E1187
1.18
Floor (0.8 m)
Schwefeldioxid
E1196
2.26
Floor (0.2 - 0.3 m)
Schwefelwasserstoff
E1197
1.19
Floor (0.2 - 0.3 m)
Silan
E1188
1.16
Floor (0.8 m)
Stickstoffdioxid
E1130
1.59
1.5 –1.8 m
Stickstoffmonoxid
E1129
1.04
1.5 –1.8 m
Sauerstoff
E1195
1.10
1.5 –1.8 m
Table Mounting Heights
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 and Oxygen
Page 5
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
3 Electrical Connection
3.1 Plug Connection (SC2) in SB2, MSB2, MSC2, MGC2
SC2 sensors are equipped with a reverse polarity protected connector (3-pin). It mustn’t 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 to 20 mA operating mode, please remove the
built-in 500 ohm resistor between terminals 2 and 3.
4 Commissioning
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).
Required instruments for commissioning (calibration):
Service Tool DGC-06 STL or
DGC-06 EasyConf 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 sensor board. 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 Boards GA_Boards.
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 and Oxygen
Page 6
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
5 Calibration
The service tool DGC STL_06 or DGC_06 EasyConf software are available for convenient on-site calibration.
See description of Service Tool DGC STL_06 or DGC_06 EasyConf 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 warm-up time depends on the sensor element and is shown in
the following table:
Gas type
Formula
Calibration with
replacement gas
Sensitivity in %)
Warm-
up (h)
Flow rate
(ml/min)
Calibration
interval in
months1
Ammonia
NH3
-
18
300
12
Chlorine
Cl2
-
6
150
6
Hydrogen fluoride
HF
NO2 (80 %)
6
150
6
Hydrogen cyanide
HCN
-
6
300
6
Hydrogen chloride
HCL
-
1
150
6
Ethylene
C2H4
-
6
150
12
Fluorine
F2
-
6
300
6
Formaldehyde
CH2O
-
24
300
6
Carbon monoxide
CO
-
1
150
12
Ozone
O3
-
6
150
12
Phosphine
PH3
6
150
12
Sulphur dioxide
SO2
-
6
300
12
Hydrogen sulphide
H2S
-
6
150
12
Silane
SiH4
-
6
150
12
Nitrogen dioxide
NO2
-
6
500
12
Nitrogen monoxide
NO
-
4
150
12
Oxygen
O2
-
1
150
24
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 Basic Sensor Board.
Select the Sensor Cartridge to be calibrated by selecting the gas type.

User Manual - PolyGard®2 / µGard®2
Sensors for Toxic Gases and Oxygen
Page 7
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
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 with "Read".
When the value is stable, the new zero offset factor is calculated with "Calibration".
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 with "Read".
Apply test gas (flow rate according to the table "Calibration", 1 bar ± 10%) to the Sensor Cartridge.
When the value is stable, the new gain factor is calculated with "Calibration".
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 <> BSB) 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 BSB or the RSB (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 BSB or RSB. 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 BSB. If they match and the
communication is correct, the error message will be automatically acknowledged in the Gas Controller.
The yellow LED of the BSB 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 and Oxygen
Page 8
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
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> BSB> Field Bus>
GC Controller” is tested.
6 Inspection 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 and Oxygen
Page 9
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
7 Troubleshooting
7.1 Indicators at the SC2
The SC2 has got no diagnostic indications; they are only available on the basic sensor boards of SB, MSC,
MSB or MGC.
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 Basic Sensor Board
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.
BSB: no address
Check BSB address, address
correctly.
BSB: 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 BSB.
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 and Oxygen
Page 10
PolyGard/ µGard® are registered trademarks of MSR GA_SC2_MC2_Tox_D_0618
Phone [phone] Fax: [phone] Specification subject to change without notice
MSR-Electronic GmbH, Würdinger Str. 27, D 94060 Pocking www:msr-electronic.de Printed in Germany
8 Cross-sensitivity Data
The cross sensitivity depends on the used transmitter type and can be read from the table Technical Data (see
section 9.). 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.
9 Technical Data
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 (for 24 VDC)
MC2 for toxic gases and oxygen
23 mA, max. (0.6 VA for 24 V)
Analog output signal
Proportional, overload and short-circuit proof,
load 500 Ohm for current signal, ≥ 50 kOhm 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
General
Sensor element
Electrochemical
Pressure range
Atmospheric ± 20 %
Storage temperature
5 °C to 30 °C (41 °F to 86 °F)
Storage time
6 months
Physical
Housing type P
Polycarbonate
Combustion
UL 94 V2
Enclosure colour
RAL 7032 (light grey)
Dimensions: Housing type P
(d x H) 24 x 22 mm (0.94 x 0.87 in.)
Weight
ca. 30 g (0.066 lb.)
Protection class
IP 65
Mounting
Screw mounting
Connection
Screw type terminal 3-pin
Guidelines
EMC directives 2014/30/EU
CE
Compliance with:
EN 61010-1:2010
ANSI/UL 61010-1
CAN/CSA-C22.2 No. 61010-1
EN 50104 (for O2)
EN 50545 (for underground garages)
Warranty
1 year on sensor (not if poisoned or overloaded),
2 years on device