MSR INTEC PolyGard 2 MGC6 User manual

User Manual
PolyGard®2 MGC6 3-Channel Controller
August 16, 2023 – Revision
INTEC Controls | 12700 Stowe Drive, Suite 100, Poway, CA 92064 | [phone] & (888) GO.INTEC | inteccontrols.com
March 27, 2023

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Table of Contents
1 General................................................................................................................................... 5
1.1 Applicability ............................................................................................................................................5
1.2 Intended Use...........................................................................................................................................5
1.2.1 3-Channel Controller MGC6..................................................................................................5
1.3 Safety........................................................................................................................................................5
1.4 Responsibilities of Installers and Operators...................................................................................6
1.5 Services ....................................................................................................................................................6
1.6 Limited Warranty ...................................................................................................................................6
1.7 Part Disposal ...........................................................................................................................................6
2 Functional Description ........................................................................................................... 7
2.1 General .....................................................................................................................................................7
2.1.1 3-Channel Controller MGC6..................................................................................................7
Stand-Alone Mode.....................................................................................................................7
2.2 Function Output .....................................................................................................................................8
2.3 Relay Mode ..............................................................................................................................................8
2.4 Relay Function Static/Flash .................................................................................................................8
2.5 Horn Function (not safe output circuit because resettable) ....................................................... 9
3 Installation ........................................................................................................................... 10
3.1 Mounting Instructions........................................................................................................................ 10
3.2 Installation Work................................................................................................................................. 10
4 Electrical Connection ........................................................................................................... 12
4.1 General Notes ...................................................................................................................................... 12
4.2 Terminal Connection.......................................................................................................................... 13
4.3 Connection Diagrams......................................................................................................................... 14
5Commissioning..................................................................................................................... 15
5.1 General Notes ...................................................................................................................................... 15
5.2 Visual Check ......................................................................................................................................... 15
5.3 Selection Gas Type with Unit ........................................................................................................... 15
5.4 Registration/Assignment of AT6 ..................................................................................................... 16
Example MGC6......................................................................................................................... 16
5.5 Checking / Changing Operating Parameters................................................................................ 17
5.6 Stand-Alone-Operation ..................................................................................................................... 17
5.7Running-in Characteristics ............................................................................................................... 18
5.8Functional Test .................................................................................................................................... 18
5.9 Calibration AT6.................................................................................................................................... 18
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6Operating Modes .................................................................................................................. 19
6.1 Restart (Diagnostic and Warm-up Stage) ...................................................................................... 19
6.2 Measuring Mode.................................................................................................................................. 20
6.3 Special Mode........................................................................................................................................ 21
6.3.1 Maintenance and Calibration Mode................................................................................. 21
6.3.2 Faults....................................................................................................................................... 21
7Maintenance and Service...................................................................................................... 23
7.1 Inspection ............................................................................................................................................. 23
7.2 Functional Test .................................................................................................................................... 23
7.3 Maintenance and Calibration........................................................................................................... 24
7.4 Repairs................................................................................................................................................... 24
7.5 Exchange of Sensor Head.................................................................................................................. 25
Sensor Head AT6..................................................................................................................... 25
8Project protection ................................................................................................................ 26
Configuration and Parameter Cards ..................................................................................... 26
9.1 Configuration Card System Parameters ......................................................................................... 26
9.2 Configuration Card Alarm Relays / Signal Outputs ...................................................................... 26
9.3 Configuration Card AT6 (Analog Measuring Points).................................................................... 27
10 Technical Data ...................................................................................................................... 28
9
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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 Applicability
PolyGard2-Serie:
•3-Channel Controller MGC6
1.2 Intended Use
The PolyGard®2 devices must not be used in potentially explosive atmospheres.
The device must only be employed in areas within the environmental conditions as specified in the
Technical Data (indoor application). The intended sites are all areas being directly connected to the
public low voltage supply, e.g. residential, commercial and industrial environments as well as small
enterprises.
1.2.1 3-Channel Controller MGC6
The 3-Channel Controller MGC6 is designed for the connection of max. 3 analog sensors with
4-20 mA signal. The controller monitors the measured values and activates the alarm relays if the
set alarm thresholds for pre-alarm and main alert are exceeded. In addition, the values are
also provided as 4-20 mA output.
1.3 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.
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1.4 Responsibilities of Installers and Operators
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. The device must be checked for correct
installation and functionality by a qualified person before measurement operation is started.
The PolyGard®2 devices are tested for function by the manufacturer before delivery. The
installation should only be carried out by trained installation technicians, taking into account the
current safety procedures for control installations.
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.
1.5 Services
It is recommended to check the PolyGard®2 devices regularly. Due to regular maintenance
any performance deviations may easily be corrected. Recalibration 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.
Regular maintenance must be carried out in accordance with the instructions provided herein.
If the MGC6 needs to be returned, an authorized RMA number issued by INTEC Controls is required.
1.6 Limited Warranty
MSR-Electronic GmbH | INTEC Controls does not assume any liability in case of improper or
incorrect use of the device. The installer and operator are exclusively responsible for the design
and use of the product. If the product is not used, maintained or repaired in accordance with
the instructions for use, warranty and product liability claims as well as claims arising from any
guarantees assumed by MSR-Electronic GmbH | INTEC Controls for the product will be forfeited.
MSR-Electronic GmbH | INTEC Controls warrants the PolyGard®2 devices for a period of 2 years (1
year for sensors) 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. This
warranty does not apply to units that have been altered, had attempted repair, or been subject to
abuse, accidental or other-wise. 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.
1.7 Part Disposal
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.
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2 Functional Description
2.1 General
The function of the sensor series AT6 is not subject of this manual but can be read in the User
Manual of AT6.
Connection Options for Sensors
AT6 Sensors
with 4–20 mA Signal
MGC6
Standard Max. 3 1–3
Table 1: Overview of the Connection Options for Sensors
2.1.1 3-Channel Controller MGC6
The 3-Channel Controller MGC6 is designed for the connection of max. 3 sensors in total, AT6
series or other 4–20 mA signal devices. The connected sensors are monitored in the MGC6 for
plausibility within the defined measurement, temperature and voltage range, etc.
Stand-Alone Mode
The unit monitors the measured values, compares them to the 2 alarm thresholds and if exceeded
activates the 2 alarm relays as well as a visual and an acknowledgeable, acoustic alarm. A
fault occurred activates the fault relay and is signaled visually and acoustically.
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2.2 Function Output
Action Reaction
(GS = Gas Signal)
(AT =Alarm Threshold)
(CFM = Collective Fault Message)
Alarm LED
Display /
WAO
Alarm 1
Relay 1
Alarm 2
Relay 2
Alarm 3
Relay 5
Warning
Light/Flash
Alarm 4
Relay 4
Horn
Relay 3
(CFM)
GS < AT 1
GREEN
Inactive
Inactive
OFF
OFF
Inactive
GS AT 1
RED slowly
flashing
Active
Inactive
OFF
OFF
Inactive
GS AT 2
RED fast
flashing
Active
Active
OFF
OFF
Inactive
GS AT 3
RED fast
flashing
Active
Active
ON
OFF
Inactive
GS AT 4
RED fast
flashing
Active
Active
ON
ON
Inactive
GS AT 4
+ horn acknowledged
(+ recurrence function)
RED fast
flashing
Active
Active
OFF after
delay ON
OFF
Inactive
Maintenance due (no alarm or
fault)
GREEN
flashing
Inactive
Inactive
OFF
OFF
Inactive
Internal error / fault
YELLOW
Inactive
Inactive
OFF
OFF
Active
Table 2: Function Digital-Output with Relays
Note 1: Relay 1 and 2: Operation mode Energized
Status Inactive: Alarm OFF = Relay coil is powered
Status Active: Alarm ON or device tension-free = Relay coil is current-free
Relay 3: Operation mode Energized
Status Inactive: No fault = Relay coil is powered
Status Active: Fault or device tension-free = Relay coil is current-free
Relay 4 und 5: Open-Collector / transistor output, operation mode De-energized
Status OFF: Alarm OFF or device tension-free
Status ON: Alarm ON
Note 2: Alarm thresholds can have the same value, therefore the relays and/or the horn and
flashlight can be triggered together.
2.3 Relay Mode
Definition of the relay operation mode: The terms energized/de-energized come from the terms
energized/de-energized to trip principle (open-circuit/closed-circuit principle) used for safety
circuits. The terms refer to the activation of the relay coil, not to the relay contacts (as they are
executed as a changeover contact and available in both principles).
The LEDs attached to the modules show the 2 states in analogy (LED off -> relay current-free).
2.4 Relay Function Static/Flash
Definition of the relay function: The function "flashing" represents a connection option for warning
devices to improve visibility. If” flashing” is set, this must not be used as a safe output circuit any
more. A combination of relay mode energized with flashing operation makes no sense and is
therefore suppressed.
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2.5 Horn Function (not safe output circuit because resettable)
The horn function is considered to be active if at least one of the 2 parameters (time or assignment
to digital input) is set. The horn function retains its functionality even for alarms in latching mode.
Special function: Recurrence of the horn relay
After an alarm has been triggered, the horn will remain active until it is acknowledged. After
acknowledgment of the horn relay/s (clicking a button or via external input) a timer starts. When this
time has run out and the alarm is still acting, the relay is set again. This process is repeated endlessly
as long as the associated alarm remains active.
Alarm 2
Relay 2
Gas concentration higher lower than threshold
Acknowledging-
signal
On
Off
On
Off
On
Off
Time Time
Figure 1: Horn Function
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3 Installation
Check for completeness and accuracy using the delivery documents and the identification
label on the device.
Electronics can be destroyed by electrostatic discharge (ESD). Therefore, the installation
work should be done only by persons conne
cted to ground, e. g. by standing on a
conductive floor or by taking appropriate grounding measures (acc. to DIN EN 100015).
3.1 Mounting Instructions
When choosing the mounting location, you have to consider the ambient conditions in order to get
representative measurement results. Please pay special attention to the following factors:
•External heat sources are not allowed on the installation site.
•Choose mounting location according to the local regulations.
•Consider ventilation conditions! Do not mount next to air passages or suction holes.
•The sample gas must pass the sensor even under adverse flow conditions. A flow test can be
performed for instance with smoke tubes.
•If the flow conditions are > 6 m/s, it is advisable to use a wind shield.
•Mount the device at a location with minimum vibration and minimum variation in
temperature
•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.
•Observe possible constructor’s instructions
•The installation height depends on the relative gas density of the monitored gas type and
can be read in the User Manual of the AT6 Sensors.
3.2 Installation Work
Assembly work must only be carried out under gas-free conditions.
The housing must neither be spot-drilled nor drilled through outside the knockouts.
The installation position of the gas detector is always with the sensor head downwards,
cables are introduced from above.
The housing is delivered in closed condition. Before breaking out the knockouts, the exact position
and size of the sensors and cable entries must be determined.
The enclosures type A, C and E offer different mounting options depending on the number and types
of sensors due to a variety of pre-stampings.
The sensor is supplied in separate packaging and should only be mounted on the enclosure during
commissioning to protect it from dirt and damage. For sensors that can be poisoned by silicones,
such as all semiconductor and heat tone sensors, it is imperative to use a protective cap (C2-Z1) and
to remove it only after the silicones have dried and the unit is energized.
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Mounting Procedure:
•
•
•Open housing cover.
•Determine mounting location for AT6 and cable
entries on housing.
•Break out the required knockouts on the housing
bottom part.
•Fix the unit to the wall at the 4 marked fixing points
on the back of the housing (see Figure 2) so that the
sensor is always directed vertically to the ground.
•The dimensions XX depend on the type and can be
read on the back of the housing, in the housing
version C, it is 115 mm.
•Check sensor for gas type, measuring range and
calibration date.
•Insert sensor and tighten it with M25 hexagon nut.
Close and screw the cover.
Figure 2: Mounting of Controller
XX
XX
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4Electrical Connection
Assembly work must only be carried out under gas-free conditions!
Consider static electricity instructions (ESD)!
4.1 General Notes
•Installation and connection of the electrical installation should only be performed by a
professional when de-energized, according to the connection diagram and in accordance with
the relevant regulations.
•The technical requirements and regulations for wiring, electrical security, as well as project
specific and environmental and local conditions etc. must be observed when mounting.
•All terminals are screw type. The permissible conductor cross section can be read from the
Technical Data.
•Avoid any influence of external interferences by using a shielded cable for the 4–20 mA
signal, but do not connect the shield.
•Strip the wires as shortly as possible. It is important to ensure that bare wires, e.g. wire shields
do not come into contact with the mounted PCB (risk of short-circuit).
•Low voltage wire and mains connected wire must be fixed separately by cable ties or similar,
to secure against looseness.
•The alarm signals are available as potential-free change-over contacts. If required, the power
supply is available at the L1 socket.
•Use copper conductors only, for the terminal is only for connection to copper wire.
•Analog transmitters are connected directly to the spring type terminals of the module. The
correct polarity must be observed.
•Recommend (min. 300 V ) wires for external analog transmitters.
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•When choosing the option “Power Supply ≥ 90 VAC” you must make sure that a switch or a
circuit breaker is provided in the building automation especially for the unit. It must be
installed easily accessible near the unit. It has to be marked as a disconnecting device for the
unit and shall meet the relevant requirements of UL/IEC 60947 and UL/IEC 60947-3.
•The exact position of the terminals for the transmitters and alarm relays is shown in the
connection diagrams.
4.2 Terminal Connection
Attention:
Connecting the 24 V field bus voltage to the field bus terminals BUS_A / BUS_B
can
destroy the Board completely!
•Open the cover. Insert the cable from above and strip it.
•Remove terminal blocks from Board, connect cable according to connection diagram chapter
4.3.
•AT6 Sensor: Connect to analog input AI_01, AI_02, AI_03 (X13). The correct polarity must be
observed.
Pin 1 = +24 V
Pin 2 = AI_01 Signal
Pin 3 = AI_02 Signal
Pin 4 = AI_03 Signal
Pin 5 = GND
•Replug terminal carefully on the Board.
•Close cover.
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Relays drawn de-energized
Relay Mode = Energized (Alarm ON= Relay OFF)
Relay
Alarm 1
Relay
Alarm 2
Relay
X3
Fault (3)
X41 1 12 2 23 3 3
Digital
Input
MGC6 3-Channel Controller
4-20 mA
GND
Analog
Input
DI_1 DI_2
1 2 3
X11
1 13 32 24 4 5 6 7
X12 X13
24 VDC AI_01 AI_02 AI_03 AO_01
Analog
Output
Sensor*
2
24 VDC
GND
4-20mA
1 2 3
Sensor*
3
24 VDC
GND
1
4-20mA
2 3
Digital
Input
GND
2X2X
Power
Supply
24 VDC
X1
23 1
+24 V GND NC
o o
JP 2 w/o: 4-20 mA
oo
with; 2-10V)
JP w/o
Function
(Reserved)
Service
Tool
LED yellow/green/red
similar to WAO
X21 X20
Relay Status
LED green
Relay Status
LED green
Relay Status
LED green
(Reserved)
Sensor*
1
24 VDC
GND
4-20mA
1 2 3
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MGC6
DIMENSIONS
inches (mm)
WIRING CONFIGURATION
MGC6
Notes:
•Relay Fault (3) is always energized.
•The connection of 2x AT6 sensor
heads with IR sensor is not allowed.
•When connecting 2x AT6 sensors, at
least 1x must be an electrochemical
sensor from the AT6-E11XX series.
•When connecting 3x AT6 sensors,
at least 2x must be electrochemical
sensors from the AT6-E11XX series.
•Max. 3 sensors in total.
5.12
(130)
5.12
(130)
2.95
(75)
5.12
(130) 6.22
(158)
5.12
(130)
(Reserved) (Reserved)
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4.3 Connection Diagrams

5Commissioning
5.1 General Notes
All devices without exception run through a complete functional test before delivery.
However, transportation, storage, installation or special environmental conditions may lead to
(mostly small) deviations. It is therefore necessary that a person authorized by the manufacturer or
alternatively an expert puts the device properly into operation and performs a functional test.
Only trained technicians should perform the following when commissioning:
•Check for correct mounting location.
•Check if connection is correct according to connection diagram.
•Check power voltage.
•Register AT6.
•Adjust application parameters.
•Calibrate (if not already factory-calibrated).
•For sensors that can be poisoned by silicones, such as all semiconductor and catalytic bead
sensors, it is imperative to use a protective cap (C2-Z1) and to remove it only after the
silicones have dried and then energize the unit.
•Required instruments for commissioning (calibration):
oCalibration: see User Manual AT6.
For fast and comfortable commissioning, we recommend proceeding as follows. For digital devices
with self-monitoring all internal errors are visible via the LED. All other error sources often have their
origins in the field, because it is here where most of the causes for problems in the field bus
communication appear.
5.2 Visual Check
•Right cable type used.
•Correct mounting height according to gas type.
•Led status
5.3 Selection Gas Type with Unit
•The selection of the desired and connected gas sensor type is made by pre-set values.
•If other gas sensor types are connected, you have to adjust them with the configuration tool,
because otherwise the device will respond with an error message.
•The selection contains all necessary information for the controller and is also used for
comparing the real digital data with the settings.
•There is an entry available per gas type for each unit.
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5.4 Registration/Assignment of AT6
The AT6 4–20 mA signal series sensors is detected/monitored. By selecting the signal type
(analog or bus), the gas type and the measuring range, the input is activated. The instructions
can be found in the User Manual of the Service-Tool STL6. MGC6:Up to 3 different sensors can
be connected to the MGC6 (max. 3x AT6). The AT6 must be connected to input 1 (address 1)
The position of the AI determines the position of the measuring point in the parameterization (AI1
= MP1, AI2 = MP2, AI3 = MP3).
Example MGC6 with 1x AT6 for CO, 1x AT6 for NO2and 1x AT6 for C3H4with base address 01
Input Mode Field Bus
Address
Gas
Type
Measuring
Range
Result
1 AT6 DP 01 CO 300 ppm CO AT6 assigned to input 1 und thus field bus address DP01
2 AT6 DP 02 NO230 ppm NO2AT6 assigned to input 2 und thus field bus address DP02
3 AT6 DP 03 C3H4100 % LEL C3H4 AT6 assigned to input 3 und thus field bus address DP03
Mode: AT6
AT6
AT6
= AT6 with 4–20 mA signal, assignment to Input 1
= AT6 with 4–20 mA signal, assignment to Input 2
= AT6 with 4–20 mA signal, assignment to Input 3
Gas type and meas. range: Selection of gas type and range of the AT6 connected
The registration is only accepted if the assigned gas type/measuring range are identical in the
MGC6 and in the AT6. Gas type and measuring range of the MGC6 are checked for identity by the
built-in GC-06 programming module, too.
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5.5 Checking / Changing Operating Parameters
The base parameter set is stored in the unit in a fail-safe manner and documented in the enclosed
calibration and test protocol. Necessary changes of parameters for adaptation to the application
are to be carried out only by experts with the Service-Tool STL6 or, if available, on the display.
The parameter functions as well as the menu navigation and operation can be found in the
User Manual of the Service-Tool STL6.
Note:
High gas concentrations can use up the oxygen in sensors working according to the catalytic bead
measuring principle. The result is a falling measurement signal because of the reduced gas
combustion in the sensor although gas may still be present. In this case it cannot be ensured that the
measured signal is still correct, the sensor signal is unprecise. Therefore, the latching function must
be active in catalytic bead sensors for combustible gases.
5.6 Stand-Alone-Operation
In stand-alone operation, monitoring, evaluation and warning are carried out directly on the unit. For
this purpose, the alarm thresholds as well as the assignment of the alarms to the local alarm relays
and outputs for a visual and acoustic warning must be parameterised directly on the unit.
Alarm 1 = Relay 1
Alarm 2 = Relay 2
Fault = Relay 3
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5.7Running-in Characteristics
After switching on or after an internal reset of the microcontroller, the device always runs through a
start routine with defined status of the outputs. The start always begins with the diagnosis and warm-
up stages. When they have succeeded and finished, the measurement operation starts. External
intervention is not possible during this start routine.
The states of analog output, relays, field bus and signal LEDs for all operating stages are shown in
the following table.
Start
LED on Display
Analog
Output
Relays
Field Bus
LED Board
3-colour
Power
Alarm
Fault
Alarm
Fault
Diagnosis (ca. 0.5 sec.) < 2 mA OFF Error4Communication STOP
OK
Warm-up period
2s
2s
2s
< 2 mA OFF Error
4
Communication STOP
2s
2s
2s
OK
Measuring mode
6
2
4–20 mA
1
3
OK5
Communication OK
Maintenance message
2
4–20 mA
1
3
OK5
Communication OK
2s
2s
2s
Special mode
6
7
2 mA8
7
Error4Communication OK
Detected fault
6
7
2 mA
7
Error
4
Communication OK
Processor failure < 1 mA
OFF
Error
4
Communication STOP
Table 4: Status of Operating Modes
1Depends on the measured gas concentration
2Status depends on the gas concentration and the alarm threshold
3Status depends on the gas concentration, the alarm threshold and the operating mode
4Relay de-energized, contact open
5Relay energized; contact closed (OK state)
6Brightness cyclically flashing when message to field bus
7Previous status doesn’t change.
8No influence on the analog signal if the Special Mode was triggered by the operator.
5.8Functional Test
The functional test has to be carried out and documented in accordance with chapter 8.
5.9Calibration AT6
Calibration of the AT6 during commissioning is only necessary if the calibration date
is no longer up to date (see User Manual AT6).
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6Operating Modes
During operation, the unit can assume different operating modes. A distinction is made between the
warm-up phase, measuring mode and special mode, whereby special mode is divided into 2 different
subcategories.
6.1 Restart (Diagnostic and Warm-up Stage)
The device is designed in a way that it generally runs through all internal device tests (diagnostics)
in the Board and in the connected sensor head(s) after each power-up or processor reset before the
measuring operation starts. That means that the processor's internal components and the associated
program and working memories as well as the other components of the input and output units are
tested. This process takes approximately 0.5 seconds.
When all diagnostics have been successful, the warm-up phase of the sensor element starts.
The warm-up is necessary for the sensor element in the sensor head to assume a stable state after
return of the voltage without triggering a pseudo alarm. The duration of the warm-up phase depends
on the type of sensor used and can be read from the User Manual of the AT6. If several sensors
are connected, the duration of the warm-up phase depends on the sensor head with the longest
warm-up phase.
When using a display or a Service-Tool STL-06:
During the warm-up phase, the yellow LED flashes every 2 seconds and "Power ON Time" appears in
the display.
Subsequently, the display shows
•the current bus address at the top left,
•the gas type in the top centre and
•the unit at the top right.
“Warm-up Time" appears in the lower section of the display. Further information can be found in the
User Manual "Service-Tool and Display for PolyGard®2 and PolyXeta®2".
The status of the unit during the warm-up period is shown in Table 4.
After the end of the warm-up phase, measurement operation starts and the necessary diagnostic
functions continue to run in the background.
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6.2 Measuring Mode
In normal operating mode = measuring mode, there are no faults present, the gas concentration of
the sensor is continuously polled, checked for plausibility, output on the analog output (if available)
and provided on the field bus. The gas concentration is displayed on the built-in display, if available.
When the alarm evaluation is activated, only with alarm threshold > 0, the gas signal is checked with
each measurement cycle, if it is ≥ alarm threshold (alarm evaluation for increasing concentration)
respectively ≤ alarm threshold (alarm evaluation for falling concentration) and if exceeding
respectively falling below, the alarm LED and the optional alarm relay are triggered. If the value falls
below / exceeds the alarm threshold minus / plus the set hysteresis again, the alarm is automatically
cancelled.
The gas detector continuously monitors itself, the measurement signal, the analog output, the alarm
relay and the communication to the sensor head.
The device continuously monitors itself, the measurement signal, the analog output, the alarm relay
and the communication to the sensor head.
If the measurement signal falls below the zero point, this will be tolerated
•for combustible gases with catalytic bead sensor element (Pellistor) up to a limit of - 10 % of
the measuring range (- 10 % LEL), the analog output signal drops down to 2.4 mA and within
this range no error is generated,
•for toxic gases with electrochemical sensor element and gases with IR-Premium sensor
element up to a limit of –4.5 % of the measuring range (- 1.125 % vol for O2), the analog
output signal drops down to 3.3 mA and within this range no error is generated.
Active dead band suppresses the 4–20 mA signal around the zero point (see STL6 User Manual).
If the measurement signal exceeds the full-scale value, this will be tolerated up to a limit of + 6 %
of the measuring range, the analog output signal increases up to ≥ 21.2 mA and there will be still no
error generated.
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MGC6 – UserManual