Oldham MX15 User manual

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IN NS ST TA AL LL LA AT TI IO ON N A AN ND D O OP PE ER RA AT TI IN NG G
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IN NS ST TR RU UC CT TI IO ON NS S
Ref : NPM15GB

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Warnings
Read these instructions carefully before installation and start-up particularly ensuring
compliance with the instructions regarding safety of equipment with regard to the
intermediary or final user.
The electrical installation and connections should be performed by qualified personnel in
accordance with the manufacturer instructions and the standards of competent authorities in
the industry.
Non-compliance with the instructions may have a serious impact on people’s safety. Strict
compliance is required particularly for electrical installation and assembly (connections,
service lines).
Any modification of the equipment as well as use of unauthorized parts will result in
cancellation of any warranty.
The central unit is designed to be used for specific purposes that are indicated in the
technical specifications. It is not authorized to exceed the specified values in any case.
This document is not contractually binding. In the interests of its customers, INDUSTRIAL
SCIENTIFIC reserves the right to modify the technical specifications of its equipment
without notice in order to improve its performance.
Signalling
Operating ground terminal
Attention! Risk of electric shock.
Attention (see accompanying documents)

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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 total satisfaction.
Now it is important to read this document carefully.
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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, installation or storage of its equipment
resulting from failure to observe instructions and warnings and/or standards and regulations in force.
* INDUSTRIAL SCIENTIFIC neither supports nor authorises any company, physical or moral person to
assume responsibility on behalf of INDUSTRIAL SCIENTIFIC , even if it is involved in the sale of
INDUSTRIAL SCIENTIFIC products.
* INDUSTRIAL SCIENTIFIC cannot be held responsible for direct or indirect damage or be required to
pay direct or indirect compensation resulting from the sale or use of any of its products IF THESE
PRODUCTS HAVE NOT BEEN DEFINED AND CHOSEN BY INDUSTRIAL SCIENTIFIC FOR
THEIR SPECIFIC USE.
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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
* Drawings, plans, specifications and information included in this document contain confidential information
that is the property of INDUSTRIAL SCIENTIFIC
* 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 reasons without 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
performance.
* 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
repaired according to INDUSTRIAL SCIENTIFIC directives, by INDUSTRIAL SCIENTIFIC
personnel 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.)

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Table of contents
I. PRESENTATION.......................................................................................................................................6
II. TECHNICAL SPECIFICATIONS .....................................................................................................6
1. CHARACTERISTICS...................................................................................................................................6
III. DETAIL SPECIFICATIONS FOR USE IN EXPLOSIVE ATMOSPHERES IN
ACCORDANCE WITH THE ATEX 94/9/CE EUROPEAN DIRECTIVE...................................................8
1. SPECIFICATIONS FOR MECHANICAL AND ELECTRICAL INSTALLATION IN CLASSIFIED ZONE.....................8
2. METROLOGICAL SPECIFICATIONS............................................................................................................8
3. CONNECTION OF DETECTORS OTHER THAN INDUSTRIAL SCIENTIFIC TO THE MX15 CENTRAL UNIT 9
3.1. Transfer curves of central unit in configuration 0 at 100% LEL.......................................................9
3.2. Power supply and load resistance characteristics...........................................................................10
4. MARKING ..............................................................................................................................................10
IV. CENTRAL UNIT INSTALLATION ................................................................................................10
1. CENTRAL UNIT MOUNTING.....................................................................................................................10
2. CENTRAL UNIT ELECTRICAL CONNECTIONS ...........................................................................................10
2.1. Protective ground.............................................................................................................................10
2.2. Power supply....................................................................................................................................11
2.2.1. Power supply 230 Volts (115VAC on request)..........................................11
2.2.2. Power supply 24 VDC (protection through F8) can be connected on
terminals 0 and +24V, as indicated in the wiring examples at the end of the manual.
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2.3. Measuring channel...........................................................................................................................11
2.3.1. Sensors .......................................................................................................11
2.3.2. Alarm relays...............................................................................................12
2.3.3. Fault relays.................................................................................................12
2.3.4. Remote acknowledgment...........................................................................12
V. OPERATING INSTRUCTIONS.......................................................................................................13
1. INSTRUCTIONS ON THE DISPLAY UPON ACTIVATION:..............................................................................13
1.1. Measuring channel display..............................................................................................................13
2. MENUS ..................................................................................................................................................13
2.1. Menu viewing...................................................................................................................................13
2.2. Menu validation ...............................................................................................................................13
2.3. To exit while viewing a menu (ECHAP)...........................................................................................14
2.4. Programming menu..........................................................................................................................14
2.5. Initialisation menu (INI)- Start-up...................................................................................................15
2.6. Code (access) menu .........................................................................................................................15
2.7. Buzzer menu.....................................................................................................................................15
2.8. TEST menu (TST).............................................................................................................................15
Attention: this menu should be used for calibration after a first start-up...................................................15
3. TESTING OF RELAYS AND EXTERNAL CONTROLS.................................................................................17
4. CLEANING .............................................................................................................................................17
5. CENTRAL UNIT MAINTENANCE...............................................................................................................17
6. REPLACEMENT OF FUSES .......................................................................................................................18
7. SCRAPPING OF MX15..............................................................................................................................18
VI. SPARE PARTS...................................................................................................................................18
VII. EXAMPLES OF CONNECTIONS...................................................................................................19

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I. . P Pr re es se en nt ta at ti io on n
The MX15 measuring and alarm unit has been designed for simple facilities that do not require the
implementation of an electrical cabinet.
The MX15 central unit can be connected to combustible or toxic gas detectors or oxygen detectors.
The measurement of the sensor is displayed on the MX15 central unit and compared to alarm
thresholds. In the event that the threshold is exceeded, the central unit activates the relays that can
control external units.
The MX15 central unit consists of the following components:
•A wall case with access «hatch» to settings (potentiometers)
•A motherboard including all system components (power supply, display, relays and
connectors
•A front face with tactile keys.
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II I. . T Te ec ch hn ni ic ca al l s sp pe ec ci if fi ic ca at ti io on ns s
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1. . C Ch ha ar ra ac ct te er ri is st ti ic cs s
Mounting Box on DIN rail
Dimensions: 185 * 157 * 67 mm
Materials: ABS type plastic
Cable inputs/outputs: 3 cable gland type M20 cable diameter 5.5 to 12 mm
1 cable gland M16: diameter 4 to 8 mm
direct input available through wall crossing
Protection: IP31
Electric power supply 230 VAC or 115VAC upon request
and 21 V at 30 VCC
Consumed power: 16 VA
Operating conditions
Ambient temperature: -10 to +45°C
Storage temperature: -10 to +40°C
Humidity: 5% to 95% non-condensed
Embedded audible alarm: through buzzer
Number of measuring channels 1

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Number of sensors: *1 OLC10-type combustible gas detector or 2 OLC10 TWIN
detectors for detection of methane, butane, propane in boiler
rooms and GPL, GNV or H2 in parking lots
*1 OLCT10-type combustible gas detector for detection of
methane, butane, propane in boiler rooms and GPL, GNV or H2
in parking lots
*1 to 5 detectors of same type OLCT10 for detection of CO,
NO, NO2.
Cable length: OLC10 and OLC10 TWIN: max. 300 m at 3x1.5 mm²
(4x1.5 mm² between the two OLC10 TWIN) OLCT10 EXPLO:
1,000 m at 1.5 mm²
OLCT10 TOX: 2,000 m at 1.5 mm²
Measurement: continuous
Measuring ranges programmable
Display front
Type: LCD screen
4 digits 7 segments, 3 characters 14 icon segments
4 LEDs
Description of unit and gas: programmable by user in a list
3 characters edited by user
Keyboard: through tactile keys for access to menus, indicator test,
acknowledgment
Alarms
Type: 2 independent thresholds defined by user
manual or automatic erasure by increasing or decreasing value
through programming
viewing through red indicator
relay output (alarm 1 and 2)
Relays 2 independent alarm relays with positive/negative safety
programmable by manufacturer.
1 out of order relay in positive safety
break or make contact that may be configured on all relays using
a jumper
Cutoff level 2A / 250 Volts AC/ 30 volts DC
Connection
Type: spring terminals
Cable section: maximum 2.5 mm²

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Remote acknowledgment through short circuit of 2 MX15 terminals, using an
external potential-free dry contact (maximum 2 meters)
Certification
ATEX 94/9/CE Directive: category (3)G for metrology in explosive gas detection EN
61779-1 and 4 in zones 2.
Low-voltage directive: in accordance with EN 61010
Electromagnetic Compatibility
Directive CEM: in accordance with EN 50270
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II II I. . D De et ta ai il l s sp pe ec ci if fi ic ca at ti io on ns s f fo or r u us se e i in n E Ex xp pl lo os si iv ve e
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At tm mo os sp ph he er re es s i in n a ac cc co or rd da an nc ce e w wi it th h t th he e A AT TE EX X
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94 4/ /9 9/ /C CE E E Eu ur ro op pe ea an n D Di ir re ec ct ti iv ve e
The MX15 detection central unit, designed for measurement of explosive gas, is compliant
with the requirements of the ATEX 94/9/CE European Directive regarding explosive atmospheres.
Thanks to its metrological performance, the MX15 central unit associated with the
INDUSTRIAL SCIENTIFIC CEX300 and OLC 10 detectors is a safety device for ATEX Zone 2
classified areas. The central unit can also reduce the risk of explosion through information provided
to external units.
The site manager where the equipment is installed should take into consideration and
comply with the information in the following paragraphs. Refer to the provisions of the ATEX
1999/92/CE European Directive regarding the enhancement of safety and health of the workers
exposed to risks of explosive atmospheres.
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1. . S Sp pe ec ci if fi ic ca at ti io on ns s f fo or r m me ec ch ha an ni ic ca al l a an nd d e el le ec ct tr ri ic ca al l
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in ns st ta al ll la at ti io on n i in n C Cl la as ss si if fi ie ed d Z Zo on ne e
Installation will be performed in accordance with existing standards, in particular, EN
60079-14, EN 60079-17 standards.
The MX15 central unit should not be exposed to mechanical vibrations and should be
installed in a safe area, away from explosive atmospheres.
It is essential to refer to the operating and start-up instructions of the above-mentioned gas
detectors in paragraph ‘Detail specifications for use in explosive atmospheres in accordance with the
ATEX 94/9/CE European Directive.’
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2. . M Me et tr ro ol lo og gi ic ca al l S Sp pe ec ci if fi ic ca at ti io on ns s
The central unit complies with the metrological European standards EN61779 and
EN61779-4 for methane (calibration gas), butane, propane and hydrogen (gas as per response
curves), when the central unit is used with CEX300 and OLC 10 gas detectors.

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In the event that the central unit is used with other types of sensors supplying a measuring
current of 4/20 mA, they should comply with paragraph 1.5 of Appendix II of the Atex 94/9/CE
Directive and be compatible with their characteristics (see central unit transfer curve).
Note: the test vibrations in accordance with EN61779-4 paragraph 4.13 have not been performed
because they do not apply due to the operating conditions of the MX15 central unit.
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3. . C Co on nn ne ec ct ti io on n o of f d de et te ec ct to or rs s o ot th he er r t th ha an n I IN ND DU US ST TR RI IA AL L
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SC CI IE EN NT TI IF FI IC C t to o t th he e M MX X1 15 5 c ce en nt tr ra al l u un ni it t
As previously explained, the user who want to connect detectors other than INDUSTRIAL
SCIENTIFIC, should ensure that they are compatible with the central unit so that the unit is
considered a safety device.
3.1. Transfer curves of central unit in configuration 0 at 100% LEL
The following curve provides a response to the central unit regarding the measured value
and fault processing, based on the value of the input current supplied by the detector. In the event
that the user connects a detector of a brand other than INDUSTRIAL SCIENTIFIC to the MX15
central unit, he/she should ensure that the transfer curve is compatible with the input characteristics
of the central unit, so that the information provided by the detector is accurately interpreted. In
addition, the central unit should supply a sufficient supply voltage taking into account the cable
drops.
Caution: When the measurement is >= to 100% LEL, the measuring unit memorizes this scale
overrun, the channel passes to alarm and fault mode. The resetting of this status is manual and is
the responsibility of the user who should comply with the safety instructions of his/her site. The
resetting is either validated through an ON/OFF of the central unit or through a maintenance
operation.
4
mA
20
mA
100 % LEL
Signal supplied by
the detector in mA
Display
in % LEL
Fault
Fault
1.6
mA
0 % LEL
-15 % LEL
SUP

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3.2. Power supply and load resistance characteristics
Maximum current available between terminals 2 and 3: 300 mA at 20 V.
Maximum no load voltage between terminals 2 and 3: 30 V
Load resistance between terminals 1 and 2: 47 ohms
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4. . M Ma ar rk ki in ng g
OLDHAM Arras
II (3) G
OSA 05ATEX0120
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IV V. . C Ce en nt tr ra al l u un ni it t i in ns st ta al ll la at ti io on n
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1. . C Ce en nt tr ra al l u un ni it t m mo ou un nt ti in ng g
Mounting is performed using a DIN rail, positioned so that it provides a 5 cm free area around the
central unit.
The MX15 central should be installed in all facilities away from explosive atmosphere, preferably
in an attended area (control centre, console room, control room, etc.) and in a less humid (no
condensation) and temperate environment (see chapters 2.1 and 3)
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2. . C Ce en nt tr ra al l u un ni it t e el le ec ct tr ri ic ca al l c co on nn ne ec ct ti io on ns s
Electrical connections should:
-be performed by a specialist and while the central unit is off (power supply is shut off)
-comply with existing regulations (including NF C 15-100)
-has a minimum section of 1.5 mm² and a maximum section of 2.5 mm2 for power supply
from power system (230VAC)
Check the current nature and network voltage (the network voltage should match the voltage
specified on the central unit maker’s plate).
2.1. Protective ground
The central unit must be connected to an operating ground. The ground terminal (yellow ochre) is
identified by the following symbol:
Refer to wiring examples at the end of the manual.

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2.2. Power supply
2.2.1. Power supply 230 Volts (115VAC on request)
230VAC is standard power supply: protection is provided
-either through F8= 630 mA/250VAC
-either through F6/F7 = 100 mA/250VAC
A special “115VAC” configuration is provided by the manufacturer upon request.
The central unit should be protected upstream through a bipolar differential circuit breaker.
The response curve is of type D.
The mains should be wired on the two terminals L (orange)and N (blue), as indicated in the wiring
examples at the end of manual.
2.2.2. Power supply 24 VDC (protection through F8) can be connected on
terminals 0 and +24V, as indicated in the wiring examples at the end of
the manual.
2.3. Measuring channel
2.3.1. Sensors
The various types of sensors should be connected on the terminals C1, C2 and C3 (white) of the
connector as indicated in the wiring examples at the end of manual.
The "Wheatstone bridge"-type "explosive gas " sensors with 3 active wires:
C1: median point (signal)
C2: detector filament (-)
C3: compensator filament (+)
F8