Industrial Scientific MX62 User manual

Operating Instru
c
tions
Gas Detection System
NPM
62GB
Révision : D
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GAS DETECTION
We are delighted that you have chosen an INDUSTRIAL SCIENTIFIC instrument and would like
to thank you for your choice.
We have taken all the necessary measures to ensure that your instrument provides totalsatisfaction.
Now it is important to read this document carefully.
E
EX XT TE EN NT T O OF F R RE ES SP PO ON NS SI IB BI IL LI IT TY Y
*INDUSTRIAL SCIENTIFIC declines its responsibility towards any person for material damage, physical
injury or death resulting wholly or partly from inappropriate use, installationor storage of its equipment re-
sulting from failure to observe instructions and warnings and/or standards and regulations in force.
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assume responsibility on behalf of INDUSTRIAL SCIENTIFIC , even if it is involved in the sale of
INDUSTRIAL SCIENTIFIC products.
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direct or indirect compensation resulting from the sale or use of any of its productsIF THESE PRODUCTS
HAVE NOT BEEN DEFINED AND CHOSEN BY INDUSTRIAL SCIENTIFIC FOR THEIR
SPECIFIC USE.
C
CL LA AU US SE ES S C CO ON NC CE ER RN NI IN NG G P PR RO OP PE ER RT TY Y
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*None of this information may be reproduced, copied, divulged or translated, by physical, electronic or any
other means, nor used as the basis for the manufacture or sale of INDUSTRIAL SCIENTIFIC equipment
or for any other reasonswithout prior consent from INDUSTRIAL SCIENTIFIC
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WA AR RN NI IN NG GS S
*This document is not contractually binding. In the interests of its customers, INDUSTRIAL SCIENTIFIC
reserves to modify the technical specifications of its equipment without notice, in order to improve its per-
formance.
*READ THIS MANUAL CAREFULLY BEFORE FIRST USE OF THE EQUIPMENT: this manual
must be read by any person who is or will be responsible for using, maintaining or repairing this equipment.
*This equipment will only provide the announced performance levels if it is used, maintained and re-
paired according to INDUSTRIAL SCIENTIFIC directives, by INDUSTRIAL SCIENTIFIC person-
nel or by personnel approved by INDUSTRIAL SCIENTIFIC
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GU UA AR RA AN NT TE EE E
2 years guarantee in normal conditions of use on parts and technical labour, return in our workshops, excluding
consumables (sensors, filters, etc.)
Subject to change without notice (Version 4.2)
FE BA MX62 V4.2 E 0801SE

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1. THE SYSTEM MX62.....................................................................................................7
2. CONFIGURATION.........................................................................................................7
2.1. Description of Modules..............................................................................................................................................8
2.1.1. Controller Module (CM).................................................................................................................................8
2.1.2. Analogue Input Module (AEM).....................................................................................................................8
2.1.3. LED Module......................................................................................................................................................8
2.1.4. Basic Relay Module (RBM) and Extension Relay Module (REM).........................................................9
2.1.5. Loop Module (LOOPM).................................................................................................................................9
2.1.6. Analogue Output Module (AAM)...............................................................................................................10
2.1.7. LCD Module ...................................................................................................................................................10
2.1.8. Analogue Input Extension Module (AEAM).............................................................................................10
2.1.9. LCD Copy Module.........................................................................................................................................10
2.1.10. MIMIC Module...............................................................................................................................................11
2.2. Description of Redundancy....................................................................................................................................12
2.3. Description of Control Panel..................................................................................................................................12
3. OPERATION OF THE SYSTEM MX62....................................................................12
3.1. Channel and System Information.........................................................................................................................12
3.1.1. ISA Procedure (slow flashing channel LEDs)...........................................................................................14
3.1.2. General buzzer relay ......................................................................................................................................14
3.2. Normal Operation.....................................................................................................................................................15
3.2.1. Operating status..............................................................................................................................................15
3.2.2. Alarms ..............................................................................................................................................................15
3.2.3. Channel Malfunction.....................................................................................................................................16
3.2.4. Negative Measured Values...........................................................................................................................16
3.2.5. Under scale ofMeasuring Range.................................................................................................................16
3.2.6. Over scale of Measuring Range...................................................................................................................17
3.2.7. Resetting of Alarm Signals ...........................................................................................................................18
3.3. Start-up Mode ............................................................................................................................................................19
3.4. Maintenance Mode ...................................................................................................................................................19
3.4.1. Alarm Suspension...........................................................................................................................................20
3.4.2. Operational Test..............................................................................................................................................20
3.4.3. Calibration.......................................................................................................................................................21
3.4.4. Channel On/Off...............................................................................................................................................21
3.4.5. PC Communication........................................................................................................................................22
3.4.6. Ignore communication fault with relay modules.......................................................................................22
3.4.7. General alarm suspension.............................................................................................................................23
3.5. Single Mode ................................................................................................................................................................23
3.6. System Error ..............................................................................................................................................................24
3.7. Measures against Faults..........................................................................................................................................25
3.8. Error Codes of the Controller Module................................................................................................................26
3.9. Overview of LED Indications ................................................................................................................................28
4. OPERATING OF THE LCD MODULE.....................................................................29

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4.1. Display of Channels..................................................................................................................................................29
4.2. Menu.............................................................................................................................................................................29
4.2.1. System / LED-Test.........................................................................................................................................30
4.2.2. System / System Status..................................................................................................................................30
4.2.3. System / System Information.......................................................................................................................30
4.2.4. Channel Information / Current Information...............................................................................................30
4.2.5. Channel Information / Display of Configuration......................................................................................30
4.2.6. Relays...............................................................................................................................................................30
4.2.7. Analogue Outputs...........................................................................................................................................30
4.2.8. Data Logger / Set-up......................................................................................................................................30
4.2.9. Data Logger / Histogram...............................................................................................................................31
4.2.10. Data Logger / Events.....................................................................................................................................31
4.2.11. Data Logger / 8-Hour Mean Values............................................................................................................31
4.2.12. Data Logger / Format.....................................................................................................................................32
4.2.13. Printer Settings................................................................................................................................................32
4.2.14. LCD Settings...................................................................................................................................................32
5. MAINTENANCE...........................................................................................................35
5.1. Calibration and Adjustment..................................................................................................................................35
5.1.1. Direct Calibration at the Transmitter..........................................................................................................35
5.1.2. Remote Calibration for Standard Transmitter...........................................................................................36
5.1.3. Manual and Automatic Field Adjustment of Digital Transmitter TBGW EX .....................................36
5.2. Transmitters...............................................................................................................................................................36
6. TECHNICAL DATA.....................................................................................................36
7. TERMINAL CONNECTIONS, JUMPERS AND ROTARYSWITCH...................38
7.1. Controller Module (CM).........................................................................................................................................38
7.2. Analogue Input Module (AEM) ............................................................................................................................39
7.3. Analogue Input Extension Module (AEAM).....................................................................................................40
7.4. Basic Relay Module (RBM) and Extension Relay Module (REM) .............................................................41
7.5. Loop Module (LOOPM)..........................................................................................................................................42
7.6. Analogue Output Module (AAM).........................................................................................................................43
7.7. LCD Module / LCD Copy Module.......................................................................................................................44
7.8. MIMIC Module.........................................................................................................................................................45
8. CONNECTION AND INSTALLATION .....................................................................46
8.1. Wiring ..........................................................................................................................................................................46
8.1.1. Mains Supply...................................................................................................................................................46
8.1.2. Connection of Relays.....................................................................................................................................46
8.1.3. Connection of Transmitters ..........................................................................................................................46
8.2. Installation of MX62.................................................................................................................................................46
8.2.1. Wall-mounted Housing.................................................................................................................................46
8.2.2. 19"-Rack..........................................................................................................................................................47
8.2.3. Control Panel...................................................................................................................................................47

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9. CUT-OUT FOR CONTROL PANEL INSTALLATION...........................................47
10. ACCESSORIES AND SPARE PARTS...............................................................48
11. CERTIFICATES......................................................................................................48
11.1. CE Accreditation................................................................................................................................................48
11.2. Metrological Approvals.....................................................................................................................................49
11.3. Special Conditions for Safe Operation..........................................................................................................50
12. ANNEX A: EC-DECLARATION OF CONFORMITY........................................51
13. ANNEX B: TRANSLATION OF DATA LOGGER MESSAGES.....................52
14. ANNEX C: PLANNING AID: FUNCTIONAL SAFETY FOR MX62................52
14.1. Introduction.........................................................................................................................................................52
14.2. MX62 as a part of safety control installations in compliance with directive EN 61508...................52
14.3. Definition of safety-related functions to be effected by MX62................................................................53
14.4. Requirements for the configuration ofMX62.............................................................................................53
14.5. Failure rates .........................................................................................................................................................56
14.6. Instructions for employment ...........................................................................................................................57

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1.The System MX62
MX62 is a stationary control system and evaluator to be used in combination with a va-
riety of transmitters for continuous detection of combustible gases, toxic gases and oxy-
gen.
Main features are high reliability as well as remarkable flexibility. This flexibility refers
to all areas, such as free programmability and placing of relays and analogue outputs as
well as optional installation in wall-mounted housings, 19”-racks or control panels.
Modular components allow extension of up to 64 channels, 128 relays and 64 analogue
outputs as well as optional use of an LCD Module with data logger or Profibus Module,
making the gas detection system suitable for all applications.
The complete system and all required modifications can be set bysoftware ConfigPro®.
This software is detailed separately.
2.Configuration
The system consists of a Controller Module plus various other modules linked by digital
busses. The basic configuration is as follows:
•Analogue Input Module (AEM)
•Controller Module (CM)
•LED Module
•LCD or Logo Module
The Analogue Input Module converts the 4-20 mA of the transmitters into digital bus
signals to be transmitted to the Controller Module where these are evaluated and then
separately indicated for each channel according to the respective presetting. One Ana-
logue Input and one LED Module are provided for eight channels each. The Controller
Module can directly be employed for 64 channels.
In addition, further modules can be integrated into the system as required:
•Basic Relay Module (RBM)
•Extension Relay Module (REM)
•Analogue Output Module (AAM)
•Loop Module (LOOPM)
•LCD Data Logger Module
•Profibus Module
•Analogue Input Extension Module (AEAM)
Each Basic Relay Module provides eight relays to be freely allocated. The
Extension Relay Module allows an addition of eight relays with a minimum
of space. The Analogue Output Module is available for either 4-20 mA or 0-
10 V. Furthermore, all measured values and information can be displayed
withthe LCD Module and stored by a data logger.

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2.1.Description of Modules
2.1.1. Controller Module(CM)
The Controller Module is the central control unit of the system for all 64 channels of
maximum configuration. Two synchronously working 16-bit micro controllers redun-
dantly process the measured values of the Analogue Input Modules. Via a redundant
bus, the status of the relays and the analogue output signals are transmitted to the Re-
lay and Analogue Output Modules respectively. Another bus transmits the measured
values to the LCD and LED Module. For safety control, the Controller Module also
contains relays to signal system errors, emergency operation and maintenance mode.
By means of an RS232 interface, the entire system can be configured and all data can
be visualized on a PC. A Centronics interface is available for connection of a printer.
2.1.2. AnalogueInput Module(AEM)
The transmitters are connected to the Analogue Input Modules. Each module accom-
modates up to any eight transmitters of 4-20 mA and provides an additional RS485 in-
terface per channel. By this interface, communication can be established during main-
tenance between a PC, connected to the Controller Module, and the respective
transmitter. Up to eight Analogue Input Modules can be connected to the Controller
Module. An address between 1 and 8 is allocated to each module by rotary switch.
2.1.3. LED Module
The status of each channel is indicated by LEDs (One transmitter can be connected to
any channel).Operation of the keys for the respective channels displays additional in-
formation about the relevant transmitters on the LCD Module and triggers further
channel functions such as alarm suspension, operational test, channel disconnection
and calibration mode. The LED Module consists of an LED panel for 16 channels and
one or two PCBs for eight channels each.
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16

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2.1.4. Basic Relay Module (RBM) and Extension Relay Module (REM)
A Basic Relay Module has eight relays and can be extended by eight relays with a
pluggable Extension Relay Module.
Redundant triggering of the relays is done via two 8-bit micro controllers. Free pa-
rameter setting of the relays with the help of software ConfigPro®meets all individual
requirements:
•AND/OR Logic Operation
•Open and Closed Circuit Operation
•Grouping
•Voting
•Time-delay and Slow Release
•Relay Function for Buzzers
•Relay Reproduction
Up to eight relay modules with a total of 128 relays can be integrated into the system.
The redundant, opto-isolated RS485 bus allows spatial separation (up to 800 m) of the
modules and control unit. An address between 1and 8 is allocated to each module by
rotary switch.
Open circuit:
The relays are activated as soon as the respective status is recognized, i.e.the relay in-
ductor pick up.
Closed circuit:
The relays are activated during undisturbed operation, i.e.the relay inductor have
picked up, and will be deactivated in case of alarm, i.e.the relay inductor will be re-
leased.
2.1.5. Loop Module(LOOPM)
The Loop Module for MX62 offers the possibility to build a network of digital transmit-
ters or to record measured values of any standard 4-20 mA transmitter by means of the
Analogue Input Modules connected to aLoop Module.
The Loop Module can be employed in three different configurations:
1. As regular Loop Module with up to 16 digital transmitters (e.g. TBGW
EX) linked to the closed loop (addresses 1 to 16). When using this type of
configuration, no additional Analogue Input Modules (AEM) can be con-
nected.
2. With one Analogue Input Module (AEM) and up to 8 digital transmitters
linked to the loop (addresses 9 to 16).
3. With two Analogue Input Modules (AEM) for connection of up to 16
standard 4-20 mA transmitters. In this case, digital transmitters cannot be
linked to the loop.
Connection of digital transmitters to the loop is realized by means of junction
boxes (Item No. 81090). Junction cables must not exceed a length of 30 cm.

10
ATTENTION!
When connecting digital transmitters to the Loop Module, the current output
(4-20 mA) inside the transmitter has to be blocked with a shunt resistance of
approx. 180 ohms between ground (GND) and current output (4-20 mA).
Furthermore, the two jumpers inside the transmitter for the bus end resistance
(jumpers for RS485, next to the connection for power supply) need to be re-
moved.
2.1.6. Analogue Output Module(AAM)
The employment of up to eight AAMs with a total of 64 outputs allows transmission
of transmitter signals (4-20 mA or 0-10 V). An address between 1 and 8 is allocated to
each module by rotary switch.
ATTENTION!
Though the AAM has two microcontrollers, only one controller is able to transmit data
to the outputs. This is generally done by controller B. Since this will block transmis-
sion of measured values by controller A, same will be considered as faulty and the
LED for fault will light up in red.
Should controller B be faulty, controller A will take over transmission of measured
values to the outputs. In this case, the LED of controller A will light up in green and
that of controller B in red.
2.1.7. LCD Module
The system MX62 can be equipped with a graphic LCD display (240 x 128 pixels)
showing, for example, information on measuring points, all relevant system parame-
ters as well as system events and histograms. The LCD Module is provided with an in-
tegrated data logger with a storage capacity of up to 64 MB.
2.1.8. Analogue Input Extension Module (AEAM)
The AEAM is intended for the connection of smoke detectors. It is possible to connect
up to 8 smoke detectors at each AEAM. The AEAM is anextension module and hasto
be plugged on the AEM.
ATTENTION!
It is not allowed to connect gas detectors to the AEAM.
2.1.9. LCD CopyModule
The LCD Copy Module is a modified LCD Module. It offers the possibility to connect
additional LCD displays (max. 30) to the “display bus” of the MX62 System®.
The LCD Copy Modules have to be use in principle only in combination with a stan-
dard LCD Module (Software version 2.05 and higher).
In opposition to the LCD Module it offers no data logging functionality and any inter-
action. In normal operation mode it displays the logo of the company and the date. The
backlight is off.

11
Each alarm on one of the 64 channels will be displayed by the LCD Module and the
LCD Copy Module(s). The backlight will be activated automatically. If there is more
than one alarm at the same time, the affected channels will be displayed alternating for
ten seconds.
The LCD Copy Module is subordinated to the LCD Module. During interaction with
the standard LCD Module, e.g. a user wantsto see information about one channel by
pushing the channel button, the LCD Copy Module still shows the logo of the com-
pany, even if there is analarm.
System messages are displayed by four LEDs.
The LCD Copy Modules are addressable (Software V 2.18 and higher). The addresses
are set during production. By setting a address it is possible to display the alarms se-
lective. Modules with the address “0” are showing all messages. The configuration of
selective messages has to be done bythe software “ConfigPro”.
2.1.10. MIMIC Module
It is possible to copy the LED Modules by using MIMIC Modules.
The MIMIC Module has to be connected to the “display bus” of the system MX62.
Each MIMIC Module copies exactly one LED Module. It is possible to connect a fur-
ther LED Module to the MIMIC Module or to copy the primary LED Module by using
the open collector outputs of the MIMIC Modules.
Note:
The MIMIC Module just shows status information of the channels. The buttons of the
LED Module are deactivated.

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2.2.Description of Redundancy
The redundant structure of the system MX62 means that the complete safety functions
are provided twice. From conversion of analogue signals into bus signals to evaluation
in the controller module and relay connection, any single error will not lead to failure
of the safety functions. In addition, the two controllers of the Controller Module con-
tinuously compare with each other. Thus, not only single-error-protection is achieved
but also maximum availability.
To fulfillmaximum safety criteria, the whole safety chain from transmitter to relay
must be provided twice. Linking of transmitters and relays can be carried out with the
software ConfigPro®.
2.3.Description of Control Panel
The control panel consists of at least one LED Module indicating 16 channels and one
Logo Module displaying the four LEDs for status monitoring. Three further LED
Modules can increase the number of channels to 64. The LED Modules are identified
by letters of A to D. The channels are always numbered consecutively from 1 to 16.
Inputs Channel Identification
From to LED Module from to
1 16 AA1 A16
17 32 BB1 B16
33 48 CC1 C16
49 64 DD1 D16
The inputs can also be freely allocated to the LED Modules with the software Config-
Pro®.
3.Operation of the System MX62
During normal operation, the control system and evaluator MX62 continuously proc-
esses signals of the connected transmitters. Besides, MX62 can enter into other modes
for servicing or in case of malfunction. This chapter describes the various operating
modes and the respective system performance.
3.1.Channel and System Information
As a standard, MX62 provides optical LEDs for the display of channel and system in-
formation.
Channel information refers to the respective transmitters. The indication is done by
seven LEDs for every channel on the LED Module.

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LEDs for Channel Information:
Over scale of Measuring Range
Alarm 3
Alarm 2
Alarm 1
Under scale of Measuring Range
Fault (Channel Malfunction)
Power (Operation)
Channel Key
The four LEDs on the Logo Module or optional LCD Module provide System Informa-
tion ofthe System MX62 itself.
LEDs for System Information:
b
a
t
t
e
r
y
s
e
r
v
i
c
e
s
i
n
g
l
e
m
o
d
e
s
y
s
t
e
m
f
a
i
l
u
r
e
These blinking LEDs indicate a certain system status. For detailed description, please
see:
•3.6. “System Error”
•3.5. “Single Mode”
•3.4. “Maintenance Mode”
On the Controller Module a separate relay output is allocated to each of these three
modes.
The blinking LED for ‘battery’ signals power failure,which provides an emergency
power supply (optional).
1

14
Information of channel and system status can also be gained from the relay and ana-
logue transmitter signals.
ÜIn the following chapters the relay modules RBM and REM are explained. Details
are given assuming a 1:1 relation between signal and relay output. Please note that this
relation might not be valid when using the program ConfigPro® to link several alarms
or fault alarms in an installed system.
3.1.1. ISA Procedure(slow flashing channel LEDs)
For a better differentiation between “old” and “new” channel information it is possible
to activate the ISA procedure bythe software ConfigPro. If the ISA procedure is acti-
vated, each new channel information will be shown by a slow flashing LED. After ac-
knowledgement by the user the respective LED will light continuously or will set off
(see chapter 3.2.7 “Resetting of messages”).
If the ISA procedure is not activated, a new alarm or a new channelfault is leading di-
rectly to a continuous lightning of the respective LED.
Note:
In this manual the description of the status of the channel LEDs is done for the deacti-
vated ISA procedure.
3.1.2. General buzzer relay
Beneath the three system relay outputs on the CM there is a further relay output for sys-
tem information. This relay is configurable by software as follows:
-general buzzer relay:
The relay will be activated at each new alarm. This means that each
new alarm can be indicated visually or acoustically.
and/or
-warning for deactivated channels:
If the service rotary switch on the CM is moved from position 4 (acti-
vating/deactivating channel, chapter 3.4.4) to another position and
minimum one channel is still deactivated, this relaywill operate and the
user is informed that not all channels are activated.
Note:
The general buzzer relay will not be activated if a deactivated or an alarm suspended
channel is triggered by an alarm.

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3.2.Normal Operation
The system automatically enters into normal operation once power has been supplied
and the system has undergone a short-term start-up mode (chapter 3.3). During normal
operation, both controllers of the Controller Module carry out redundant measurement.
Every channel that has been switched on will, depending on the measured value, enter
into one of several possible states. The relevant green LED for ‘power’ on the LED
Module will signal if a channel is switched on. This LED will start blinking as soon as
the respective channel is shown on the LCD display.
3.2.1. Operating status
The measuring signal is within the measuring range and the preset alarm levels.
Display:
LED Module: -
System: -
RBM/REM: -
AAM: 4-20 mA / 0-10 V according to the gas concentra-
tion calculated by MX62
LCD Module: operating status (see chapter 4)
Printer: -
3.2.2. Alarms
The system MX62 has three free adjustable alarm levels within the measuring range of
4-20 mA. The software ConfigPro®allows, for example, adjusting of alarm levels,
latching of alarms or setting of alarm thresholds for mean values within a specified
time. Furthermore, alarms can be triggered in case of over-or under run of alarm levels.
For numerous target gases and measuring profiles, Industrial Scientific-provides stan-
dard presettings with ConfigPro®.
Display:
LED Module: red LED(s) for ‘alarm’
System: -
RBM/REM: Alarm 1, 2 and/or 3
AAM: 4-20 mA / 0-10 V depending on the gas concentration cal-
culated by MX62
LCD Module: Alarm 1, 2 and/or 3
Printer: A1, A2 and/or A3

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3.2.3. Channel Malfunction
In case of channel malfunction, the measuring signal has either fallen below 2 mA or
exceeded 24.5 mA. Channel malfunction could, for example, mean interruption or short
circuit of the signaling line. The transmitter may also be defective.
It is also possible that communication with Analogue Input Modules or Loop Modules
is interrupted. In this case, all channels go into the fault mode.
This signal is not latching (see 3.7 “Measures against Faults”).
Display:
LED Module: yellow LED for ‘fault’
System: -
RBM/REM: fault
AAM: current output of transmitter (voltage output: 0 or 10 V)
or, in case of communication error, 0 mA or 0 V
LCD Module: display signal for over-or under run (see 3.2.4 and 3.2.6)
message: fault and, if non-latching for overrun, short cir-
cuit
Printer: FLT
ATTENTION!
The gas detection system MX62 differentiates the faults of a specific channel from those
of the complete system (chapter 3.6). If channel malfunctions have to trigger an external
measure automatically, the signals in configuration need to be allocated to one or sev-
eral relay outputs.
One relay output must always be configured as collective relay if application is accord-
ing to EU certificate BVS 03 ATEX G002 X.
3.2.4. Negative Measured Values
The measuring signal is below zero but above the threshold mentioned in chapter 3.2.5
for under scale of measuring range. Zero fluctuationsof the transmittersare within the
normal and acceptable range of deviations.
Display:
LED Module: -
System: -
RBM/REM: -
AAM: current output of transmitter
(voltage output: 0 V)
LCD Module: operating status (see chapter 4)
up to –3% of measuring range: “0”,
below –3%: “< 0”
Printer: -
3.2.5. Under scale of Measuring Range
In case of under scale, the signal of the transmitter is below a preset threshold which is
generally –5% of the detection range. (Deviating values up to a maximum of –10% of
the detection range can only be configured by Industrial Scientific.) Though the trans-
mitter should be calibrated measuring is still given. The signal is not latching.

17
Display:
LED Module: yellow LED for ‘under scale’ (arrow pointing downwards)
System: -
RBM/REM: under scale by measuring point
AAM: current output of transmitter
(voltage output: 0 V)
LCD Module: display of concentration: “< 0”, message: under scale
Printer: US
3.2.6. Over scale of Measuring Range
Case A (standard setting):
Threshold for over scale equals the upper range value
In case of over scale, the signal of the transmitter will be higher than 20 mA. Measuring
is still given but the signal is above the measuring range. The measured value can only
be defined as concentration above the upper scale value but no indication is available
how far the upper scale value has been exceeded. Usually, this alarm is configured to be
latching.
By the software ConfigPro®, over scale of measuring range can be signaled as an alarm.
ÜSome transmitters require special action to be taken after they have been exposed to
high gas concentrations. Calibration and adjustment might become necessary. Please
refer to the recommendations in the manuals for the respective transmitters.
Display:
LED Module: red LED for ‘over scale’ (arrow pointing upwards)
System: -
RBM/REM: over scale by measuring point
AAM: latching in case of overrun: 22 mA, non-latching in case of
over scale:
actual output of transmitter; voltage output in both cases:
10 V
LCD Module: display of gas concentration: end scale value
or, with measuring profiles of x% LEL or LEL, > end
scale value, message: over scale, display of measured
value is frozen
Printer: OS
Case B:
Threshold for over scale is below the end scale value
MX62 will react as if an alarm has been signaled (see 3.2.2).

18
3.2.7. Resetting of Alarm Signals
There are two different types of resetting:
•Resetting of Audible Alarm Signals:
Relays can be configured to be reset. In general, these should, however,
exclusively be employed for the triggering of buzzers, sirens and other
audible alarm indicators.
•Resetting of Latching Alarm Signals:
A latching alarm signal will be extant even if the gas concentration di-
minishes. The alarm signal (with the allocated relays) can only be reset
after the gas concentration has fallen below the alarm level.
Resetting is done by the keys for the respective channels.
Resetting is also possible by the external reset input (ext. reset). In this case, all re-
settable messages will be resetted.
The behavior of a channel,when resetted,depends on the activation of ”ISA procedure”
(chapter 3.1.1).
ISA procedure activated:
•In case an LCD module is used, operating the key the first time is for
the LCD display.
•Operating the key a second time resets an existing relay for audible
alarm signals and the blinking channel LED will light continuously.
•Operating the key a third time resets a latching alarm signal. (gas con-
centration < alarm threshold)
ÜShould neither an LCD module nor a relay for audible alarm signals be employed,
the latching alarm signal is already reset when the key is first operated.
ISA procedure deactivated:
•In case an LCD module is used, operating the key the first time is for
the LCD display.
•Operating the key a second time resets an existing relay.
•Operating the key a third time resets a latching alarm signal. (gas con-
centration < alarm threshold)
ÜShould neither an LCD module nor a relay for audible alarm signals be employed,
the latching alarm signal is already reset when the key is first operated.

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3.3.Start-up Mode
Upon start-up or directly after voltage cut-off, alarm signals are blocked for 1 to 10
minutes (setting by software ConfigPro®). After the start-up mode, the system auto-
matically enters into the operating status.
ÜAs many transmitters signal undefined values after start-up, this mode eliminates
any false alarms.
At the beginning of the start-up mode, functioning of the LEDs for system information
can be checked. All four system LEDs are switched on for 0.5 s and those of the LED
Modules for 2 s. The display of the LCD Module is built up line by line.
Display:
LED Module: all green LEDs for ‘power’ and yellow LEDs for ‘fault’
flash
System: LED for ‘maintenance’ flashes, maintenance relay is acti-
vated
RBM/REM: -
AAM: 2 mA
LCD Module: display initialization and start-up signals
Printer: cold reset, software version
If a mean value is configured for a given channel, it will only be determined from the
mean values calculated within a preset number of minutes after the system has re-
entered its operating status.
3.4.Maintenance Mode
This mode is for serviceand modification ofthe gas detection system.
For the various functions available in the maintenance mode, the rotary switch on the
Controller Module has to be set to the respective position (switch positions 1-5). The
number is indicated on the pertaining LED display (see chapter 7.1).
Channel Selection:
After positioning of the rotary switch (except position 5 for PC communication), one or
several channels can now successively be entered into a selected function for servicing
by operating the respective key for more than two seconds. After the two seconds have
elapsed, all LEDs for the relevant channel briefly light up. Only after releasing the key,
the respective function is available.
Completion of Servicing:
Completion of servicing of the relevant channel will be effected if the respective key is
operated once again (for more than two seconds) or the maximum time preset for servic-
ing is exceeded (software ConfigPro®).
With the switch on the controller module in position 0, the maintenance mode is ended
and the unit is back to normal operation. The yellow LED for ‘maintenance’ switches
off.

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3.4.1. Alarm Suspension
Switch Position 1
The suspension of alarms prevents that relays which are related to alarms, faults, over-
or under scale are not taken into account and are consequently not triggered.
A general alarm suspension is possible as described in chapter 3.4.7.
Display:
LED Module: yellow LED for ‘fault’ flashes, LEDs for alarm, fault, over
scale or under scale will flash if the transmitter signal
complies with respective condition
System: LED for ‘maintenance’ is on and the respective relay is ac-
tivated as soon as a channel is selected.
RBM/REM: all deactivated
AAM: 2 mA or 0 V
LCD Module: display of concentration: as in operating status,
message: alarm suspension
Printer: service relay activated
ATTENTION!
-Previously activated relay outputs are reset when, after selecting alarm sus-
pension, conditions for triggering these relays are no longer given.
-Alarm suspension must not be used for calibration purposes.
3.4.2. Operational Test
Switch Position 2
This operational test allows checking of channel LEDs, relay and analogue outputs.
ÜThe operational test simulates the triggering of all signals and alarms. After the op-
erational test has been completed, any triggered alarm will be reset only if the meas-
ured value is below the alarm threshold (including configured alarm hysterese).
Display:
LED Module: yellow LED for ‘fault’ flashes, all other channel LEDs are
on
System: LED for ‘maintenance’ is on and the respective relay is ac-
tivated as soon as a channel is selected
RBM/REM: all activated
AAM: latching in case of overrun (3.2.6): 22 mA, non-latching in
case of overrun:
actual output of transmitter
LCD-Module: latching in case of over scale (3.2.6):
display > end scale value, non-latching in case of over
scale: display of concentration equals sensor output signal,
message: operational test and other channel related sig-
nals, e.g. alarms
Printer: service relay activated

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3.4.3. Calibration
Switch Position 3
This function allows calibration and adjustment of transmitters. Outwardly, the system
operates as it does with alarm suspension.
Display:
LED Module: yellow LED for ‘fault’ flashes, LEDs for alarm, fault,
over-or under scale will flash, if the transmitter signal
complies with respective condition
System: LED for ‘maintenance’ is on and the respective relay is ac-
tivated as soon as a channel is selected
RBM/REM: all deactivated
AAM: 2 mA or 0 V
LCD Module: display of concentration: as in operating status
message: calibration
Printer: service relay activated
3.4.4. Channel On/Off
Switch Position 4
Should a channel be deactivated, the measuring signal is no longer evaluated. Channel
deactivation will be extant even after the maintenance mode is ended.
The channel can be re-activated by renewed selection.
ATTENTION!
-Even if the channel is switched off, the transmitter will be provided with 24V.
For works to be carried out in hazardous areas, power to the transmitter must be
disconnected.
-For safety reasons, an alarm is internally signaled when deactivating a channel
being in an AND or VOTING operation. The alarm will, however, not be shown on
the LED Module. This evaluation may cause alarm signaling with an AND or
VOTING operation of channels, even though this should not be the case according
to the displays of the LED Modules.
Display:
LED Module: all LEDs are off
System: LED for ‘maintenance’ is on and the respective relay is ac-
tivated as soon as the rotary switch is set to position 4 and
a channel had already been deactivated or after channel se-
lection
RBM/REM: all deactivated
AAM: 0 mA or 0 V
LCD Module: no display available
Printer: service relay activated