Oldham MX48 Commissioning, Operating And Maintenance Manual

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GAS AND FLAME DETECTION

STACK GAS AND DUST MONITORING

We thank you for choosing an OLDHAM SA instrument.

We have taken every step to ensure that this equipment continues to give
you complete satisfaction.

Please read the instruction manual carefully before using the instrument.

4

LLIIMMIITTSS OOFF RREESSPPOONNSSIIBBIILLIITTYY

* OLDHAM SA hereby rejects any and all responsibility with regard to any person for material

damage, bodily injury or death resulting in whole or in part from the inappropriate use,
installation or storage of its equipment not conforming to the instructions and to warnings and/or
not conforming to standards and regulations in force.

* OLDHAM SA does not allow or authorize any company, person or legal entity to assume such

responsibility on the part of OLDHAM SA, even if involved in the sale of the products of
OLDHAM SA.

* OLDHAM SA shall not be liable for any direct or indirect damage, or any direct or indirect

legally awarded damages resulting from the sale and use of any of its products, UNLESS

THOSE PRODUCTS WERE SPECIFIED AND CHOSEN BY OLDHAM SA FOR THE
USE MADE OF THEM.

OOWWNNEERRSSHHIIPP CCLLAAUUSSEESS

* Sketches, drawings, specifications and data included herein contain confidential

information which is the property of OLDHAM SA.

* These information shall not be, in part or in whole, physically, electronically or in any

other form whatsoever, reproduced, copied, divulged, translated, used as a basis for the
manufacture or sale of OLDHAM SA equipment or used for any other reason without

the prior approval of OLDHAM SA.

WWAARRNNIINNGGSS

* This document is not a contractually binding document, OLDHAM SA reserves the right

to make any changes, without notice, to the technical characteristics of its equipment in
order to improve performance levels, in the interest of its customers.

* CAREFULLY READ THE INSTRUCTIONS BEFORE ALL FIRST USE:

This instruction manual must be read by any person who is, or will be, responsible for the use,
maintenance or repair of this equipment.

* This equipment will conform with the specified performance levels only if it is used,

maintained and repaired in accordance with the directives of OLDHAM SA and by
OLDHAM SA personnel or personnel authorized by OLDHAM SA.

5

CCOONNTTEENNTTSS

1. DESCRIPTION...........................................................................................7

1.1. General.............................................................................................................................7

1.2. the wall-mounted box.......................................................................................................9

1.3. The various printed circuit boards...................................................................................9

2. INSTALLATION AND CONNECTIONS .............................................. 10

2.1. Installation: recommendations.......................................................................................10

2.2. Electrical connections of the MX48 Unit (Fig. 8)..........................................................10

2.2.1. Alternative power supply.......................................................................................10

2.2.2. DC power supply....................................................................................................11

2.3. Detectors (Figure 12).....................................................................................................11

2.3.1. Explosimetric detectors of PONT type ..................................................................11

2.3.2. 3-wire detectors 4-20 mA: 3 connecting wires for shielded cable.........................11

2.3.3. 2-wire detectors 4-20 mA: 2 connecting wires for shielded cable.........................12

2.3.4. FIRE detectors: 2 connecting wires for shielded cable..........................................12

2.3.5. FLAME detectors: 2, 3 or 4 connecting wires for shielded cable depending on

utilization................................................................................................................................12

2.3.6. CO2 detector of type “Ventostat VT”....................................................................14

2.3.7. Specific case of intrinsic safety detectors ..............................................................14

2.3.8. Other detectors with standardized current output ..................................................15

2.3.9. Parking application.................................................................................................15

2.4. Connecting the unit to external devices.........................................................................16

2.4.1. Slaving controls......................................................................................................16

2.4.2. 4-20 mA current outputs (Fig. 12) .........................................................................17

2.4.3. RS 232 and RS 485 outputs ...................................................................................17

2.4.4. Remote acknowledgement.....................................................................................19

3. STARTING UP ......................................................................................... 20

3.1. Checking the installation................................................................................................20

3.2. Switching on the unit......................................................................................................20

3.3. Operating modes............................................................................................................21

3.3.1. Audio warning device (buzzer)..............................................................................21

3.3.2. Light-emitting diodes (LED) (Fig. 1 and fig 4) .....................................................21

3.3.3. Alarm thresholds....................................................................................................22

3.3.4. Fault thresholds......................................................................................................26

3.3.5. Measuring unit.......................................................................................................27

6

4. UTILIZATION .........................................................................................28

4.1. List and functions of the various items of “USER” equipment for programming and

calibration of the unit.................................................................................................................28

4.1.1. Keypads..................................................................................................................28

4.1.2. Maintenance keys...................................................................................................29

4.1.3. Potentiometers........................................................................................................29

4.2. Menus.............................................................................................................................30

4.2.1. The various menus and their functions ..................................................................30

4.2.2. Block diagram of the scrolling of the various menus.............................................30

4.2.3. Detailed flow diagrams of each menu....................................................................32

5. SETTING THE MX48 UNIT INTO SERVICE...................................... 45

5.1. Programming the unit....................................................................................................45

5.2. Programming the measuring channels..........................................................................45

5.2.1. Programming..........................................................................................................45

5.2.2. Copy.......................................................................................................................46

5.3. Calibrations....................................................................................................................46

5.4. 4-20 mA output adjustment for a measurement channel................................................49

6. MAINTENANCE...................................................................................... 50

6.1. Periodic / preventive maintenance.................................................................................50

6.1.1. On the MX48 unit ..................................................................................................50

6.1.2. On the detectors......................................................................................................50

6.2. Failures: causes and remedies.......................................................................................51

6.3. List of spare and replacement parts...............................................................................54

7. DETAILED TECHNICAL CHARACTERISTICS................................ 55

8. VIEWS SPECIFIED IN THE MANUAL................................................ 57

7

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DDEESSCCRRIIPPTTIIOONN

1.1. General

The MX48 measuring and alarm unit can be fitted with between one and 16 independent channels.

Each channel is connected to one or more detectors installed in the locations to be monitored.

The measurement that is output from the detector is displayed on the MX48 unit and compared with
alarm thresholds. If thresholds are exceeded, the unit actuates relays which can be used to control
external devices.

REMARK

The equipment of the MX48 unit comprises 1 or 2 PCBs (option), each equipped with 4 channels.
However, each channel is independent and can be connected to any type of OLDHAM detector
provided that the PCB is suitably programmed.

8

MMAAIINN CCHHAARRAACCTTEERRIISSTTIICCSS

• Wall-mounted box (500 x 340 x 89)

• AC or DC power supply

• 4 or 8 measuring inputs for detectors

• Display of measurement on a plasma display panel (2 lines - 16 characters)

• One keypad with four keys on the front panel for the user

• One keypad with four keys for maintenance (on the display unit card, accessible only by

opening the front panel)

• One “CALIBRATION” key and one “PROGRAMMING” key for maintenance (on the

display unit card, accessible only by opening the front panel)

• 3 gas alarms per channel

- Two instantaneous rising or falling thresholds, manual or automatic clearing, with

“extractor control logic (tunnel parking application)”

- One rising or falling threshold, automatic clearing, triggering by time delay or

average

Relaying

Total of 10 or 18 relays distributed as follows:

- Two relays per channel, with positive or negative safety, contacts open or closed

at rest for the first two thresholds

- One relay common to channels for third thresholds or for all alarms (buzzer

transmission), with positive or negative safety, contacts opened or closed at rest

- One relay common to channels for faults and failures, constant positive safety

mode, contacts open or closed at rest.

• Current output (4-20 mA) per measuring channel.

• Common audio alarm that can be acknowledged in the case of occurrence of gas alarms.

9

1.2. the wall-mounted box

The housing of the MX48 is a wall-mounted box consisting of a back casin and a cover which can
be pivoted.

• Dimensions: Fig. 1 (end of this manual)

• Overall view, casing open : Fig. 2

1.3. The various printed circuit boards

• Overall view: Fig. 2

• Power supply board : Fig. 3

• Measuring channel board: Fig. 7

• Front link board : Fig. 4

(Comprising the display, the micro part, the DB9 RS223 and RS485 connector and the
keypads).

FIGURE 2 : COMPLETE SET OF BOARDS

VUE D'ENSEMBLE DU MX48
(carter ouvert)

Figure N°2

(voir fig N°4)

(voir fig N°3)

(voir fig N°7)

(voir fig N°7)

(voir fig N°1)

Transformateur

Coffret MX48

15 presses-étoupes PG9

Carte afficheur

Carte alimentation

2 vérrouillages 1/4 de tour

Clavier déporté

Compas pour retenir
le couvercle en
position haute

Première carte
voie de mesure

Deuxième carte
voie de mesure

MX48 box

(see Fig. n°1)

Stay for holding up the

cover

Transformer

Power supply board

(see fig. N°3)

Second measurement

channel board (see fig. N°7)

OVERALL VIEW OF THE MX48

(casing open)

FIGURE 2

15 PG9 cable glands

First measurement channel

board (see fig. N°7)

Display board

(see fig. N°4)

Offset keypad

¼ turn latches – 2 off

10

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IINNSSTTAALLLLAATTIIOONN AANNDD CCOONNNNEECCTTIIOONNSS

2.1. Installation: recommendations

The MX48 unit can be installed in any premises without an explosive atmosphere. They should
preferably be placed in a ventilated and monitored location (guardhouse, control room,
instrumentation room, etc.).

Attachment is to be ensured in accordance with the dimensions in Figure 1 (3 attachment points).

REMARK

In order to permit the swivelling front panel of the unit to be opened completely, allowance must be
made for opening by rotation through 90° downwards (see fig 2 – end of this manual)

Before making any connections, the unit should be switched off using the main On/Off switch
below and to the left of the FRONT circuit (see Figures 3 rep A).

2.2. Electrical connections of the MX48 Unit (Fig. 8)

The MX48 unit is equipped with a pulse automatic device which enables to connect 24 V DC
voltage in a lack of 220 V AC voltage so we can use no expansive save power supply.

2.2.1. Alternative power supply

- Voltage: 230 V AC (207 to 244 V) 50/60 Hz

- Maximum power: 200 VA

- Maximum current in cable: 1 A

- Cable: 3 x 1.5 mm² (including earth)

- Location of connection terminal blocks: Fig. 8,

- Protection: the phase and neutral wires are protected by time-delayed 2 A

fuses located at the rear of the power module (fig3).

- Voltage: 103 to 122 V AC - 50/60 Hz on option

CAUTION

It is mandatory that the appliance must be earthed. A terminal is reserved for this purpose at the
back of the power module: see Fig. 5. This connection is required in order to ensure correct
operation of the following:

- mains power interference filter,

- protective devices against electromagnetic interference.

11

2.2.2. DC power supply

- Voltage: 21 to 30 V continue. The "-" from continue power supply is linked to

earth (and earth being linked to frame).

- Maximum power: 150 W

- Maximum current in cable: 6.3 A

- Cable: 2 x 2.5 mm²

- Location of terminal block: see Fig. 8, item D

- Protection: by two fuses located at the back of the power module (Fig. 3)

2.3. Detectors (Figure 12)

REMARK

- The detectors are linked by SHIELDED cables.

- The utilization of shielded cables is MANDATORY

- The earth braid of shielded cables must be connected to the earth at one end

only.

CAUTION
Each channel is configured in the factory for a given type of detector (explosive gas, toxic
gas, fire or flame). If two different types of detector are interchanged, this may result in

the destruction of the central unit or of the detector.

2.3.1. Explosimetric detectors of PONT type

Three connecting wires for a shielded cable.

Resistance of detector / unit cable: 16 ohms maximum per wire, i.e. 32 ohms in loop (1 km for cable
3 x 1.5 mm²).

Connection on MX48 unit: see Fig. 10 – Example 1

2.3.2. 3-wire detectors 4-20 mA: 3 connecting wires for shielded cable

- Resistance of detector / unit cable: 16 ohms maximum per wire, i.e. 32 ohms in loop

(1 km for cable 3 x 1.5 mm²).

- Connection on MX48 unit: see Fig. 10. – Example 2

12

2.3.3. 2-wire detectors 4-20 mA: 2 connecting wires for shielded cable

- Resistance of detector / unit cable: 32 ohms maximum per wire, i.e. 64 ohms in loop

(2 km for cable 2 x 1.5 mm²).

- Connection on MX48 unit: see Fig. 11. – Example 2

2.3.4. FIRE detectors: 2 connecting wires for shielded cable

The current commercial designations are as follows:

- “Thermovelo” detectors of type EC 11 (sensitive to temperature variations)

- Ionic detectors of type EI 1 100 (sensitive to smoke)

- Optical detectors of type EO 1 100 (sensitive to smoke)

- Resistance of detector / unit cable: 28 ohms maximum per wire, i.e. 56 ohms in loop (2 km for

cable 2 x 1.5 mm²)

- Fire detectors can be detected in parallel to a maximum of five. The end-of-loop resistor

(2.7 K) is to be placed at the end of the line on the last detector.

- Connection on MX48 unit: see Fig. 11. – example 1

2.3.5. FLAME detectors: 2, 3 or 4 connecting wires for shielded cable
depending on utilization

13

REMARK

The detectors can be supplied with power either via the MX48 unit or by an auxiliary 24 V DC
source.

These detectors can operate in standalone mode:

24 V DC power supply and direct utilization of relay contacts in accordance with the
technical specification corresponding to the detector used.

The current commercial designations are as follows:

- model 20/20 U - analog - type UV - 752002 (sensitive to UV radiation)

- model 20/20 UC - analog - type UV (sensitive to UV radiation)

- model 20/20 UB - µP technology - type UV - 772002 (sensitive to UV radiation)

- model 20/20 UBC - µP technology - type UV (sensitive to UV radiation)

- model 20/20 LC - analog - type UV/IR (pyroelectric, combination of UV and IR

detectors)

- model 20/20 LBC - µP technology - type UV/IR (pyroelectric, combination of UV and

IR detectors)

- model 20/20 I - µP technology - triple IR detector - 780002 (pyroelectric, sensitive to IR

radiation)

These detectors are equipped with various types of terminal block (see table below).

Model 20/20 U 20/20 UC 20/20 UB 20/20 LC 20/20 UNC 20/20 LBC 20/20 I

Type

of terminal

block

B

C

A

C

C

C

A

- Resistance of cable / unit

- In the case of local 24 V DC power supply:

8.5 ohms maximum per wire, i.e. 17 ohms in loop

- In the case of power supply via the MX48 unit:

3 ohms maximum per wire, i.e. 6 ohms * in loop

∗ 4 ohms for detector 20/20 I (IR3)

- Connection on MX48 unit (ONE detector per measuring channel ONLY):

- detector equipped with a terminal block of type A: see Fig. 13

- detector equipped with a terminal block of type B: see Fig. 14

- detector equipped with a terminal block of type C: see Fig. 15

Example of the utilization of the 4-20 mA signal from flame detectors equipped with connectors of
type A or C: see Fig. 16.

Example of the utilization of detectors equipped with connectors of either type A or type B and with
auxiliary power supply. The auxiliary power supply must be able to supply power to the number of
detectors planned in the measuring loop (see Fig. 17).

14

REMARK

In the case of this application, the maximum of five flame detectors can be connected in the
measuring loop.

Example of the utilization of IR3 or UV/IR detectors equipped with connectors of type A with a
local junction box and galvanic insulation (see Fig. 18).

2.3.6. CO2 detector of type “Ventostat VT”

- Connection on MX48 unit: see Fig. 20.

- Resistance of detector/unit power cable: 12 ohms maximum per wire, i.e. 24 ohms in

loop.

- 4-20 mA output: maximum load = 280 ohms (whole loop)

2.3.7. Specific case of intrinsic safety detectors

Two types of intrinsic safety barrier can be used: Z787 / EX and MTL787S+.

PRECAUTIONS

Before connecting the barrier to the unit, check that the voltage is < 25 V DC.

- A short circuit in the electrical connections will result in destruction of the barrier.

- Perform wiring in the DE-ENERGIZED state.

- The electrical link between the MX48 unit and the clipper is made using a screened

cable with two active conductors with a maximum resistance of 12 ohms each.

15

REMARK
In classified areas, the installation must comply with the standards in force.

- Connections on MX48 unit: see Fig. 21.

IMPORTANT
All intrinsic safety installations must be APPROVED as a whole assembly by an approved

organization (DRIRE, etc.).

OLDHAM “INTRINSIC SAFETY” BARRIERS

Type of IS

barrier

Reference Specific features OLDHAM box

reference

Z787 / EX 6184703 To be fitted on DIN

RAIL

MTL787S+ 6797100 To be fitted in an

approved box:
MANDATORY

For 2 clippers 6797192

For 5 clippers 6797547
For 12 clippers 6797101

2.3.8. Other detectors with standardized current output

Any detector (with 2 wires or 3 wires) that can be supplied with power between 19 V DC and 32 V
DC and that supplies a standardized current (signal) of between 4 and 20 mA can be connected to
the MX48 unit.

The connection requirements are identical to those for the corresponding OLDHAM detectors (see
Fig. 22).

2.3.9. Parking application

CTX300 "Co parking" toxic gas detectors can be fitted in parallel when a mean gas concentration is
to be obtained. The detectors must, imperatively, be located in the same area. In this case, a
maximum of five detectors can be connected (see Fig. 23).

16

2.4. Connecting the unit to external devices

2.4.1. Slaving controls

The 8 measuring channels of the MX48 unit are each equipped with two relays which can be used
to control external devices: sirens, solenoid valves, extractors, telephone calls, etc..

For each measuring channel, the relays are distributed in the following manner (see Fig. 7):

- a relay associated with the triggering of alarm 1 (fig 7),

- a relay associated with the triggering of alarm 2 (fig 7),

- use of open or closed contacts selected with a jumper (see Fig. 7 – item A),

- use of positive or negative safety selected by programming (see the CHANNEL

programming menu),

- contact outputs on the back of the measuring board (see Fig. 12).

- An example of connection is given in Fig. 24:

- a siren connected to relay AL1 will be actuated as soon as alarm 1 is triggered,

- a solenoid valve connected to relay AL2 will be actuated as soon as alarm 2 is

triggered.

For all channels:

- A common relay associated with the triggering of alarm 3 for the 8channels (fig 3).

By programming, this common relay can also be used for the remote transmission of the
audio warning signal. (This relay will then be associated with all the unit’s alarms).

- A fault relay associated with the triggering of channel faults (detector failures, electrical

connections, excessively negative zero, etc.). This relay will always be in positive safety
mode (see Fig. 3).

- The use of open or closed contacts is selected by programming on common board (see

Fig. 3).

- Common relay contact outputs on the back of the power module: Fig. 8.

REMARK

Owing to the breaking capacity of the MX48 unit’s relays which is limited to 2 A / 250 V AC or 30
V DC, external intermediate relays must be used if the devices to be controlled require high power
levels.

The relay contacts are indicated : unit switched off

17

2.4.2. 4-20 mA current outputs (Fig. 12)

For each measuring channel, the MX48 unit is equipped with a 4-20 mA output that can be used to
retransmit measurements to a recorder or an external PLC. The maximum resistance in loop mode is
600 ohms. The earth connections for the 4-20 mA outputs are common and the unit. The 4-20 mA
lines are not galvanically insulated one from the other. The current output varies according to the
measurement and has several states, as follows:

- On starting up the unit: I < 1 mA

- With FAULT: I < 1 mA

- In MAINTENANCE mode: I = 2 mA

- ZERO MEASUREMENT: I = 4 mA

- Full scale: I = 20 mA

- Out of range or “in doubt”: I > 23.2 mA

An example of the connection of a multi-channel recorder is given in Fig. 25.

2.4.3. RS 232 and RS 485 outputs

RS232 OUTPUT

A computer can be connected on a female sub.D/DB9 type connector located on the back of the
micro board (fig 4 repA). The MX48 programming, from outside, will be possible thanks to this
connection.

RS 232 OUTPUT USING

- Remove the DB9 connector (plug with an internal strap)

- Connect a link cable ref.6315831 which will link the monitor to the computer on the

MX48 available female connector DB9 (Fig 6)

- when the using is stopped : no connect the cable and put the male DB9 "plug" again.

Female DB9

Male DB9

MX48

PC COMPUTER

18

RS 485 OUTPUT (PINABLE ON FIG 8)

Several MX48 units can be linked to a single computer, which is the "master" of the network. In
this case, a "SLAVE NUMBER" (by programming/unit) is asigned to each MX48 unit.

This RS 485 output can be galvanically insulated as an option.

1st case : no galvanic insulation

- no mounted insulation component

- 2 polarization electrical resistances are welded and programmed with J103 and J104 pins

2nd case : with galvanic insulation

- mounted and welded insulation component

- no programmed polarization electrical resistance for "plus" (+ 5V) (J104 programming

pins)

a) with RS 485 shielded

- no programmed polarization resistor for "moins" (GND) (J103 programming

pins)

b) without RS485 shielded

- programmed polarization resistor for "moins" (GND) (J103 programming pins)

End loop resistor

It is located on the MX48 micro board and must be programmed with the last MX48 unit of the
loop (by pins) with a 120 Ohms value.

The MX stored data are some instantaneous values

The RS485 output is a half duplex type.

RS 485 OUTPUT USING

- No change the sub D/DB9 "plug" connector (fig 4 – item A)

- Connect the screwed connector terminals 3, 4 and 5, located on the power supply board

of the MX48 unit. See connection details fig 8.

- Owing to mounted wires or not (following the mounting and the equipment linked or not

on the earth…).

19

IMPORTANT

All details regarding the RS 485 complete description (Modbus / Jbus format, structures,
adresses aso…) are developped in a leaflet ref. D 813 577.

CAUTION

A computer or a printer management interface must be used in order to printout the data stored by
the MX48 unit. See details and possibilities in a leaflet ref. 8 813 571.

2.4.4. Remote acknowledgement

It is possible to allow remote acknowledgement by connecting on terminals clear 1 and clear 2 (loop
 16 mA), of the connector located on the power supply board : see fig 8.
Maximum load impedance : 1 K
Remark : several MX48 units can be connected to the same remote acknowledgement system
provided that the polarities are respected.

Power supply
terminal

Transformer terminal

Clear and RS485
terminal terminal

20

33..

SSTTAARRTTIINNGG UUPP

3.1. Checking the installation

It is checked that, at least, all connections have been made and that the complete installation
complies with current standards in force.

CAUTION
OLDHAM is not responsible for the compliance of the complete electrical safety system.

The MX48 unit is switched on by means of circuit breakers * provided for that purpose and which
ensure protection of the mains power unit.

* The circuit breakers are to be selected according to the power consumption levels specified by the
manufacturer and the length of the electric cables.

3.2. Switching on the unit

CAUTION
The handling operations and adjustments described in these paragraphs are strictly
reserved for authorized personnel as they are liable to affect detection safety.

To start up the MX48 unit, you must:

- swivel the front panel,

- press the ON/OFF button located to the bottom left-hand side of the FRONT

circuit: see Figures 3 (item A).

- The display panel then shows, for example:

MX 48/52 V1.0

The unit then goes into INITIALIZATION mode for one minute. Consequently, all the alarms are
inhibited and the current outputs are 1 mA for the channels in service. The unit then performs a self­test * on its buzzer and all its night-emitting diodes. At the end of this one-minute period, the
channels in service return to normal operation and the corresponding alarms and relays are enabled.

21

* The user can carry out a “manual-self test” by pressing the test key at any time (see Fig. 26).
This self-test lasts 20 seconds and the display panel may show the following displays one after the
other, for example:

then

The user can interrupt the self-test cycle before it is completed by pressing the
ACKNOWLEDGEMENT key of the front panel keypad.

3.3. Operating modes

3.3.1. Audio warning device (buzzer)

In normal operation, the audio warning device is triggered whenever a fault or an alarm appears.
The audio warning device can be stopped by pressing the ACKNOWLEDGEMENT key or by
remote acknowledgement. The buzzer makes a continuous or discontinuous sound (according to the
programming of the unit) if an alarm threshold is exceeded.

3.3.2. Light-emitting diodes (LED) (Fig. 1 and fig 4)

Each channel is equipped with five LEDs (visible and identified on the FRONT panel).

LED Extinguished Illuminated

in steady mode

Flashing

GREEN Channel not in

service

Channel in service Threshold AL1 exceeded

(manual clearing) and not

acknowledged

1st red AL1 not triggered Threshold AL1 exceeded

(automatic clearing)

Threshold AL2 exceeded

(manual clearing) and not

acknowledged

2nd red AL2 not triggered Threshold AL2 exceeded

(automatic clearing)

3rd red AL3 not triggered Threshold AL3 exceeded by mean

or time (automatic clearing)

Yellow No fault Fault on channel -Channel being calibrated or

programmed

- Detector being calibrated

MX 48/52 V1.0

xx LEL CH4

*** SELF-TEST ***

xx LEL CH4

Line corresponding to
the channel displayed
when the ENTER key
was pressed

22

3.3.3. Alarm thresholds

Each of the three alarm thresholds can be programmed independently for each channel. (See the
“Channel programming” menu).

In normal operation, a gas alarm is only triggered after a preprogrammed time delay in order to
avoid spurious alarms.

Alarm thresholds can be processed in the following manners:

- in normal cycle with manual clearing: block diagram 1,

- in normal cycle with automatic clearing: block diagram 2,

- in parking cycle: block diagram 3.

The alarm thresholds are to be selected according to the gases detected and the corresponding
standards in force.

Special case: A channel connected to a fire detector

- It is MANDATORY to select the scale with 100 divisions.

- It is MANDATORY to select the alarm threshold with 60 divisions.

(Owing to the end-of-loop resistor of 2.7 kΩ, the fire detector outputs 4 mA when no fire is detected
and 20 mA if a fire is detected).

23

BLOCK DIAGRAM 1

NORMAL CYCLE WITH MANUAL CLEARING

Alarm

acknowledged

LED extinguished
Relay disengaged

Buzzer stopped

No

Illumination of flashing

alarm LED

After T2 time

START

Threshold

exceeded

Time T1

exceeded

Illumination of flashing

alarm LED

LED steady mode

Buzzer stopped

END

Relay engaged

Buzzer engaged

No

No

No

Yes

Yes

Yes

Yes

Alarm

acknowledged

24

BLOCK DIAGRAM 2

NORMAL CYCLE WITH AUTOMATIC CLEARING

START

Threshold

exceeded

Time T1

exceeded

LED extinguished

Relay disengaged

Alarm LED illuminated

in steady mode

After T2 time

Relay engaged

Buzzer engaged

END

Yes

No

No

Yes

25

BLOCK DIAGRAM 3

PARKING CYCLE

Alarm 3 operates in the same way as the normal cycle.

The times defined for alarms 1 and 2 (time delays) are, in this case, used to define the minimum
operating time for each relay.

t AL1 tR1 R2 t AL2

Threshold AL2

Threshold AL1

Starting of

relay R1

Stopping

of relay R1

Starting of

relay R2

Stopping of

relay R2

min.

t

AL1

Min. operating time for alarm 1

(defined for each channel)

t1

t

AL2

Min. operating time for alarm 2

(defined for each channel)

t2

t

R1 R2

Switching time from relay 1 to relay 2

(defined for the whole unit)

t

R1 & R2

26

3.3.4. Fault thresholds

Processing of detector faults

Each channel detects the following faults.

For toxic and explosive gas detectors:

- line interrupted (0 mA),

- line short-circuited or excessive consumption,

- negative offset (more than 20% of measuring scale),

- line in calibration mode (2 mA) (if confirmed by programming).

For detectors of the explosive gas type (4-20 mA and 340 mA) in normal mode and if the
measurement is greater than 100% of the measuring scale, there are the following immediate
results:

- Display: SUP

- The relays are actuated if the thresholds are reached.

- The general fault relay is actuated.

- The 4-20 mA output of the channel is greater than 20 mA.

- All these states are memorized and the only way of acknowledging them is to

switch off the channel and then restart it.

Faults are valid after a preprogrammed time (in the same way as alarms).

FAULT BLOCK DIAGRAM

END

START

Wait until the fault has been present

for at least 5 seconds.

The relays are locked in their current state.

The common fault relay is engaged.

The buzzer is engaged.

The channel fault LED is illuminated. *

1 mA is sent on the 4-20 mA output.

* The LED is extinguished as soon a the fault disappears.

27

3.3.5. Measuring unit

One minute after starting up, and if no test action is performed on the keypad, the unit successively
scans all the channels in service and displays the measured values.

Examples of display

OR

- Each channel is interrogated for 10 seconds.

- The user can interrogate a channel manually by selecting that channel with the + and -

keys to obtain a manual display for one minute.

- The user can return to normal cyclic scanning during that one-minute period by

simultaneously pressing the + and - keys. The display panel then shows alternating
displays, three times in succession:

For example:

then

Channel 1

x x LEL CH4

Channel 2

x x x ppm CO

Channel 5

x x x ppm CO

normal scan

x x x ppm CO

28

44.. UUTTIILLIIZZAATTIIOONN

4.1. List and functions of the various items of “USER” equipment for

programming and calibration of the unit

4.1.1. Keypads

The first is equipped with four touch keys accessible without opening and swivelling the MX48
unit’s FRONT panel, the second is equipped with the same keys accessible by opening and
swivelling the FRONT panel for maintenance (Fig 4 rep B).

NORMAL MODE

- Manual display of previous channel

- Combined with the “PLUS” key to restart the channels

automatic display cycle.

MAINTENANCE MODE

- Manual display of previous channel

- Decrease value, threshold, etc.

- Display of previous choice (oná off, etc.)

- NO

NORMAL MODE

- Manual display of next channel

- Combined with the “MINUS” key to restart the

channels automatic display cycle.

MAINTENANCE MODE

- Manual display of next menu

- Increase value, threshold, etc

- Display of next chooice (oná off, etc)

- YES

29

- “Audio and visual” or “audio” clearing of an alarm

- Exit from a current menu

- Start a self-test manually

- VALIDATE

4.1.2. Maintenance keys

PROGRAMMING key (Fig 4 item D): accessible after opening and swivelling the front panel.

- Combined with the “-” key to go back in a menu.

- To quit normal display mode and access the various menus (see block diagram of

the various menus).

- To scroll through a menu.

CALIBRATION key (Fig 4 item C) : accessible after opening and swivelling the front panel.

- To set a channel to CALIBRATION mode.

- To quit that mode.

4.1.3. Potentiometers

Each measuring channel has 5 potentiometers. These are accessible by opening and swivelling the
FRONT panel of the MX48 unit and are laid out as follows (see Fig. 5):

1 detector ZERO potentiometer
1 detector sensitivity potentiometer
1 potentiometer 4 mA / current output
1 potentiometer 20 mA / current output (for full scale)
1 potentiometer filaments power supply (340 mA)

30

4.2. Menus

4.2.1. The various menus and their functions

The MX48 unit has five menus that are accessed by pressing the “Programming” key (item D, Fig.

4).

These five menus are as follows:

DESIGNATION FUNCTION

“CHANNEL” programming - To program the whole configuration of a measuring

channel (ON/OFF, range, alarm thresholds, etc.)

“SIMULATION” programming - To artificially vary a channel measurement on:

- the display panel,

- the 4-20 mA current output.

- To trigger the alarms (LED and relays) at the same
time.

“CHANNEL COPY” programming - To copy the complete programming from one channel

to another (time saving)

“UNIT” programming - To program the whole configuration of the MX48 unit

(language, slave number, etc.).

“UPLOADING” programming Do not use this mode (re-programming of the MX48

unit).

4.2.2. Block diagram of the scrolling of the various menus

It is easy to use these various menus by means of the keys on the keypad and the “Programming”
key (Fig 4).

Detailed flow diagrams of the menu scrolling function and of each menu are given on the following
pages.

31

SCROLLING OF THE VARIOUS MENUS

NORMAL

DISPLAY

P

Programming

[Channel x x]

+

-

Programming

Simulation

+

-

Programming

Channel xx copy

+

-

Programming

Unit

+

-

Programming

Uploading

REMINDER

P

Programming key

+

Keys used to move

-

32

4.2.3. Detailed flow diagrams of each menu

CHANNEL PROGRAMMING

Remove on the programming socket before entering into programming

: last channel displayed

: Off On

+

←

→

-

then ENTER

: CHOICE OF RANGES
10 30 100 300 1000 2000 xxxxU

+→+→+→+→+→+

then

ENTER

: SELECTION OF POINT POSITIONING
100 10.0 1.00 0.100 0.010 0.001

+

 →+→+ →+ →

+

then

ENTER

: 0 to 2000

+

←

→

-

then ENTER

: 0 to 2000

+

←

→

-

then ENTER

Seuil Alarme 1

[25]

Measuring range

[100..]

Programming

[Channel xx]

Alarm 1 threshold

[25]

NORMAL
DISPLAY

Channel xx

[Off]

Alarm 2 threshold

[50.]

Decimal point

[1...]

P

P

P

P

P

P

33

: 0 to 2000

+

←

→

-

then ENTER

: Increasing Decreasing

-

←

→

+

then ENTER

: Increasing Decreasing

-

←

→

+

then ENTER

: Increasing Decreasing

-

←

→

+

then ENTER

: Normal Parking

-

←

→

+

then ENTER

Cycle

[Normal]

P

Alarm 2

[Increasing]

Alarm 3 threshold

[75]

Alarm 1

[Increasing]

Alarm 3

[Increasing]

P

P

P

P

P

34

: Manual Automatic

-

←

→

+

then ENTER

: Manual Automatic

-

←

→

+

then ENTER

: Time delay Mean

-

←

→

+

then ENTER

: Negative Positive

-

←

→

+

then ENTER

Alarm 3

[Time delay]

Ack alarm 1

[Manual]

Ack alarm 2

[Manual]

Relay 1 safety

[Negative]

P

P

P

P

35

Negative Positive

-

←

→

+

then

ENTER

Free Set to 0 Set to 1

-

←

→

+

←

→

+

then

ENTER

Free Set to 0 Set to 1

-

←

→

+

←

→

+

then

ENTER

Free Set to 0 Set to 1

-

←

→

+

←

→

+

then

ENTER

Free Set to 0 Set to 1

-

←

→

+

←

→

+

then

ENTER

Relai 2

[Free]

Relay 2 safety

[Negative]

Relay 1

[Free]

Relay 3

[Free]

Fault relay

[Free]

P

P

P

P

36

The MX48 unit can detect and indicatez (with a flashing
yellow LED) that a line has-been placed in
CALIBRATION mode on the detector.

No Yes

-

←

→

+

then

ENTER

Free display: A channel heading can be programmed
(in 13 characters maximum). By default, the channel
number is displayed in this area.

+

←

→

-

then

ENTER

CH4 CO 2S etc.

-

←

→

+

←

→

+

then

ENTER

LEL % ppm etc.

-

←

→

+

←

→

+

then

ENTER

Time: Time interval between the triggering of the AL
LED and of the corresponding relay, or the minimum
operating time of the relay in parking mode.

-

←

→

+

then

ENTER

Display of time by using keys

-

←

→

+

then

ENTER

Texte

-

←

→

+

then

ENTER

Gas

[CH4]

Cal detection

[No]

Channel xx

[Premises 1 channel] U

Units

[LEL]

Alarm 2 time

[00:00:00]

Alarm 1 time

[00:00:00]

P

P

P

P

P

P

Alarm 3 time

[00:00:00]

P

P

H mn sec

H mn sec

H mn sec

flashing

37

(Bridge) (4-20 mA)

(1)

(Fire)

(2)

: Explosive Toxic Spec. tox.

-

←

→

+

←

→

+

then

ENTER

(1) in case of "Up" fault : 3 "gas" alarms and fault alarm are triggered.
(2) In case of "Up" fault : only the fault alarm is triggered.

This key can also be used to exit from the current menu.

-

When in a menu, you can go back (to make checks or modifications,
etc.) by pressing and holding Programming key and by successively
pressing and releasing the down key- .

[ ]

Parameters specified in square brackets [ ] are the VALID parameters
(in memory).

(1) Free This means that the relay can be activated when programming alarm

thresholds are triggered.

Set to 0

This means that the relay is not powered supply, and will not be
activated by MX48 control unit with alarm..

Set to 1 This means that the relay is always powered supply (by the MX48

control unit), and neither will not be activated by MX48 control unit
with alarm. Using of relays will be directly programmed by J-BUS
input and "COM52" software.

Detector type

[Explosive]

End of menu

P

P

INFORMATION

38

LIST OF UNITS

DESIGNATION MEANING

LEL Lower explosive limit

% Percent

ppm parts per million

ppb parts per billion

UEG Unter Explosion Grenze (= LEL in German)

LEL Limite inférieure d’explosivité (= LEL in

French)

bar unit of pressure

mb unit of pressure (millibar)

Rh relative humidity

m/s metres per second

mg unit of weight (milligram)

unit + flashing U free indication of unit

-

←

→

+

then

ENTER

39

LIST OF GASES

DESIGNATION MEANING

CH4 Methane

CO Carbon monoxide

H2S Hydrogen sulphide

N Nitrogen

NO Nitric oxide
NO2 Nitrogen dioxide
SO2 Sulphur dioxide

CI2 Chlorine

H2 Hydrogen

HCL Hydrochloric acid

HCN Hydrocyanic acid

NH3 Ammonia
ETO Ethylene oxide
PH3 Phosphine

HF Hydrofluoric acid
CFC Freons
CO2 Carbon dioxide
ASH Arsine
SiH4 Silane
BUT Butane
PRO Propane

GNT Natural gas

ETY Ethylene
PNT Pentane
HEX Hexane
PRY Propylene

ACY Acetylene

ETA Ethanol

ACO Acetone

OPR Propylene oxide
OET Ethylene oxide

ISB Isobutane
DIM Dichloromethane
AET Ethyl alcohol

BUN 2-Butanol

ISP Isopropanol
XYL Xylene
TOL Toluene

ESS Petrol (gasoline)
BUD Butadiene
HYD Hydrogen

Gas + flashing U Free indication of name of gas:

-

←

→

+

then

ENTER

40

SIMULATION PROGRAMMING MENU

Simulation on previously displayed and
[validated] channel

Free labelled area

S = flashing to indicate that this channel is in
simulation mode.

To artificially vary measurement on the display
panel, on the 4-20 mA output, and trigger alarms
(LED and relays)

= ESCAPE (ECHAPPE)
To exit from this menu and return to normal
operation

Programming

[Simulation xx]

NORMAL
DISPLAY

P

P

Channel xx

LEL CH4 S

Programming

[Simulation xx]

ACK

ENTER

+

-

←

→

+

END OF MENU

41

COPY PROGRAMMING

Last channel displayed

Validation of menu

Validation of channel to be copied

: Copy the channel’s configuration to
another channel

xx = indication of “Other channel
number” using keys

-

←

→

+

: Validation of copy

Programming

Copy channel xx

NORMAL
DISPLAY

P

P

Copy channel

[Channel xx => xx]

Programming

[Copy channel xx]

Copy channel

[Channel xx => xx]

ENTER

+ +

ENTER

END OF MENU

42

UNIT PROGRAMMING

Validation of menu

Choice of languages:
: French English German Spanish

+

→+→

+

then

ENTER

Choice of transmission speed with
computer:
1200 2400 4800 9600 19200 Bauds

+→+→+→+

then

ENTER

Choice of slave address (this unit)
0 to 250

+

→

then

ENTER

NORMAL

DISPLAY

P

P

+ + +

Programming

Unit

P

P

P

Language

[French]

Programming

[Unit]

Speed
[9600••]

Slave address

[1]

ENTER

43

This is the time interval between exceeding of the
AL threshold and triggering of the corresponding
visual alarm (LED).
Display the time using keys:

-

←

→

+

→ then

ENTER

In “Parking” mode: this is the time interval between
stopping of relay 1 and starting up of relay 2.
Display the time using keys:

-

←

→

+

→ then

ENTER

Negative Positive

-

←

→

+

→ then

ENTER

Control of relay 3 (common) by any triggering of
buzzer
NO YES

-

←

→

+

→ then

ENTER

Utilization of common audio alarm (buzzer)?
(Function in series with buzzer jumper)
NO YES

-

←

→

+

→ then

ENTER

YES = If copy of buzzer on alarm 3 and with buzzer
option into service : audible alarm will be triggered
when there is an alarm.
NO = The common audible alarm (buzzer) will be
triggered for a 30 seconds maximum time (even
there is an alarm).

-

←

→

+

→ then

ENTER

Response time

[00 : 00 : 00]

P

P

P

P

P

Relay safety

[Negative]

Relay 1&2 stop T

[00: 00 : 00]

Buzzer transferred

[NO]

Buzzer connected

[NO]

Continuous buzzer

[NO]

END OF MENU

H mn sec

H mn sec

44

UPLOADING PROGRAMMING

Only OLDHAM personnel and personnel approved by OLDHAM can be made this operation.

Display of menu

Validation of utilization of
menu

Display of menu
confirmation

Data transfer request

Validation of data transfers

Confirmation of uploading

Programming

Uploading

P

END OF MENU

Uploading

Confirm

Programming

[Uploading]

Uploading
[Confirm]

ENTER

ENTER

NORMAL

DISPLAY

P

+ + + +

45

55.. SSEETTTTIINNGG TTHHEE MMXX4488 UUNNIITT IINNTTOO SSEERRVVIICCEE

REMINDER
The handling operations and adjustments described in this chapter must be performed by
authorized personnel only, as they are liable to affect detection safety.

Once the measuring unit has been switched on, it can be programmed (1), its measuring channels
can be programmed (1) according to the detectors used and calibrations can be made on the unit and
detectors.

(1) These programming operations can be carried out directly on the MX48 unit in accordance with
the following procedures or using a computer equipped with the “com 52” software.

5.1. Programming the unit

To program the MX48 measuring unit, and according to the required specifications, the “Unit
programming” menu must be used (see Section IV-2 on Menus) by means of the keypad and the
“Programming” key. Then, the instructions in the menu should simply be followed.

CAUTION

If the unit remains in programming mode for more than 30 minutes, it automatically switches to
fault mode.

5.2. Programming the measuring channels

5.2.1. Programming

To program each measuring channel according to the type of detector used and the required
specifications, the “Channel programming” menu must be used (see Section IV-2 on Menus) by
means of the keypad and the “Programming” key. Then, the menu instructions sho uld simply be
followed.

REMARK

When a channel is switched on, all its relays are in “off” mode and its current output is 1 mA. Then,
one minute later, the channel comes into effective operation (relays ready and output of 4-20 mA).

CAUTION

If a channel remains in programming mode for more than 30 minutes, it is automatically switched
to fault mode.

46

5.2.2. Copy

In order to make the programming of ALL CHANNELS less TIME-CONSUMING when the same
programming is required for a number of channels, it is recommended that the “COPY” menu
should be used (see Section IV-2 on Menus) by means of the keypad and the “Programming” key.
Then, the instructions in this menu should simply be followed.

5.3. Calibrations

When it is first switched on, with the unit and measuring cha nnels programmed, CALIBRATING
operations must be carried out on the UNIT and the DETECTORS.

Case 1
Measuring channel connected to a detector with no integrated electronics (explosive gas

detector, CAPTEX, CEX800, CEX810, etc.).

• Prepare the detector for calibration:

- Calibration consists in adjusting the detector ZERO in PURE AIR and its sensitivity to

the STANDARD GAS.

- If the detector zero is set with natural diffusion in pure air, the surrounding atmosphere

must be calm (wind speed of less than 1 m/s).

REMARK

The authorized wind speed is increased to 4.1 m/s when the detector is fitted with a weather
protective device.

• Prepare the measuring channel for calibration:

- Open and swivel the front panel of the MX48 unit.

- Manually set the channel to be calculated using keys + and - on the MX48 keypad

(item B, Fig. 4).

- Press the CALIBRATION key (item D, Fig. 4).

- At the bottom right-hand side of the display panel, the letter C flashes and the yellow

LED for the relevant channel flashes, indicating that the measuring channel is in the
“CALIBRATION” position.

REMARK

When a measuring channel is in the CALIBRATION position, all the alarm relays are inhibited (in
order to avoid interfering with the slaving control networks) and the corresponding current output is
maintained at 2 mA.

- Turn the sensitivity potentiometer five times in the clockwise direction (using a

screwdriver).

- Adjust the DETECTOR ZERO.

47

NOTE

If the ambient air is not pure, inject air using a “synthetic air” cylinder and the gas injection pipe or
a remote calibrating fixed device with a flow rate of 60 litres per hour for 25 seconds directly on the
detector or a flow rate of 170 litres per hour for 1 min 45 s using a remote calibrating fixed device.

As soon as the signal is stable on the MX48 display panel, adjust the “MEASUREMENT ZERO”
by adjusting the ZERO potentiometer (Fig. 5) and corresponding to channel to be set up, so as to
read ZERO on the MX48 display panel.

• Adjust the detector sensitivity:

- Inject the calibration gas using the gas injection pipe (or a remote calibrating fixed

device) in the same conditions as those applicable for the synthetic air (zero adjustment).

When the measurement has stabilized, set the value corresponding to the reference gas
concentration on the display panel of the MX48 unit by adjusting the sensitivity potentiometer for
the relevant channel (Fig. 5).

NOTE

For this category of explosive gas detectors, the unit’s display panel indicates 100 DIVISIONS for
100 LEL of an explosive gas.

Example:

If the reference gas is a 2.5% methane concentration, i.e. 50% LEL of methane, adjust to obtain a
display of 50 DIVISIONS.

Formula:

Maximum scale

100 DIV x n% LEL of standard gas

Number of divisions to be set =

100% LEL

Maximum LEL

- Stop the injection of the standard gas, wait for the measurement to return to zero (on the

MX48 display panel). Then, press the "CALIBRATION" key (item C, Fig 4). The
flashing yellow LED is extinguished and the "C" on the display panel disappears. The
measuring channel now operates normally an calibration has been completed.

48

Case 2
Measuring channel connected to a detector with no integrated electronics and supplying a

standardized 4-20 mA current. (CTX50, CTX100, CTX200, CTX870, etc.).

• Prepare the detector for calibration:

- See the remarks for zero adjustment in pure air and natural diffusion as in case 1.

- These types of detector (4-20 mA) often have a “CALIBRATION” position (CTX870,

CTX100, etc.) or a calibration menu (CTX2042, COX2040, etc.).
This position has the effect of transmitting a 2 mA current from the detector to the
measuring unit.

- This prevents the triggering of alarms (and slaving controls) during calibrating

operations.

CAUTION
If the detector and the measuring channel are calibrated at the same time, the detector
must be left in normal operating mode but the MX48 unit must be set to calibration mode

in order to inhibit the relays.

⇒ Consult the technical manual for the detector concerned.

- Open the detector (with integrated electronics) in order to gain access to the 4 mA

adjustment and sensitivity (20 mA) potentiometers and to the terminals used to check its
4-20 mA output current.

- With these types of detector, there are two ways of checking the current supplied to the

unit:

o by direct reading on the local display panel (internal to the detector)
o by measurement of current on the terminals provided for that purpose (see the

manual for the detector concerned).

- Prepare the measuring channel for calibration:

- same operations as in case 1.

• Adjust the detector zero.

NOTE

If the ambient air is not pure, inject air using a “synthetic air” cylinder and the gas injection pipe or
a remote calibrating fixed device with a flow rate of 60 litres per hour for 25 seconds directly on the
detector or a flow rate of 170 litres per hour for 1 min 45 s using a remote calibrating fixed device.

As soon as the signal is stable on the local display panel on the detector or with regard to the current
output (4-20 mA), adjust the DETECTOR ZERO by adjusting the detector internal ZERO
potentiometer (see the manual for the detector concerned).

Then, CONSECUTIVELY, adjust the measurement zero by acting on the ZERO potentiometer for
the measuring channel (Fig. 5) so as to read ZERO on the MX48 display panel.

49

• Adjust the detector sensitivity:

- Inject the calibration gas using the gas injection pipe (or a remote calibrating fixed

device) in the same conditions as those applicable for the synthetic air (zero adjustment).

When the measurement has stabilized (on the local display panel or on the detector internal
terminals (current measurement)), act on the detector’s internal sensitivity potentiometer (see the
manual for the detector concerned) in order to set the value (on the detector display panel)
corresponding to the concentration of the reference gas or the corresponding current (terminals).
(See the note and examples for case 1).

- Then, CONSECUTIVELY set the value of the standard gas on the MX48 display panel

by acting on the measuring channel sensitivity potentiometer (Fig. 5).

- Stop the injection of the standard gas, wait for the measurement to return to zero (on the

MX48 display panel). Then, press the “CALIBRATION” key (item C, Fig. 4). The
flashing yellow LED is extinguished and the “C” on the display panel disappears. The
measuring channel now operates normally and calibration has been completed.

5.4. 4-20 mA output adjustment for a measurement channel

Ø 4 mA adjustment

- for a zero display

- check1 the 4 mA output current and adjust it if necessary using the 4 mA

potentiometer : see fig 9.

Ø 20 mA output adjustment

- following the measurement display and the following formula :

Maximum scale

I = 4mA (0-DIV) + 16 mA x Number of divisions set

100 DIVISIONS

- Check1 the 4 mA output current and adjust it if necessary using the 20 mA

potentiometer : see fig 9

1

Current reading is possible by connecting directly the corresponding output current (see fig 12) a "continuous"

milliammeter.

50

66.. MMAAIINNTTEENNAANNCCEE

REMINDER
The handling operations and adjustments described in this chapter must be performed by

authorized personnel only, as they are liable to affect detection safety.

6.1. Periodic / preventive maintenance

6.1.1. On the MX48 unit

The MX48 measuring unit requires practically no surveillance. It is, however, recommended that
the facilities available on the MX48 unit should be used to regularly test the appliance’s essential
functions, as follows:

Use the TEST key to check the correct operation of all the LEDs and the buzzer.

Use the “SIMULATION” menu to check the correct operation of the display panel, the triggering of
alarms (LED and relays), the slaving controls and the 4-20 mA current output.

Cause a fault to occur (such as a line fault by disconnecting a detector wire) to check the correct
operation of the fault “stages”.

6.1.2. On the detectors

The detectors must be calibrated at least twice a year.

Case 1

Detectors without integrated electronics (CAPTEX, CEX800, CEX810, etc.)
With this type of detector, the zero and sensitivity adjustments must be made on the MX48 unit.
SEE THE CHAPTER ON CALIBRATIONS (see 5-3, case 1) and carry out the operations
specified.

Case 2

Detectors with integrated electronics (CTX50, CTX100, CTX870, etc.)
With this type of detector, and for periodic maintenance, all that is required is action on the
detector. SEE THE CHAPTER ON CALIBRATIONS (see 5-3, case 2) and carry out the operations
specified.

51

NOTE
Our company is at your disposal to supply you with standard gas or an annual surveillance contract

(preventive maintenance). Under this contract, our specialists guarantee the perfect operation of
your installation. No adjustment is to be made between OLDHAM servicing operations. This avoids
any additional workload for the user’s maintenance services.

6.2. Failures: causes and remedies

FAILURES CAUSES REMEDIES

Display channel not lit up and
no indicator light on.

On/Off switch in the Off
position.

Set the switch to the On
position (item A, Fig. 26).

Problem with mains power

supply or DC power supply
(24 V DC).

Check the supply voltages on
input to the MX48 unit and, if
necessary, check in the
electric power supply
cabinets.

Mains fuses blown. Replace the mains fuses (see

item A, Fig. 5).

DC power (24 V DC) input

fuses blown.

Replace the 24 V DC fuses
located at the back of the
MX48 unit (item B, Fig. 5).

+24 V DC internal protection

fuse blown.

Replace the +24 V DC fuse
located on the power board
(item C, Fig. 5).

CAUTION

When replacing a fuse, it is mandatory to comply with the
required type and rating.

Fault indicator light on (in
steady mode).

Faulty electrical connections
on the telemetry line (wires
and detector).

Check the connections on the
MX48 terminal block and the
detector terminal block.
Check that there is no short
circuit or break in the wires
on the telemetry cable.

Faulty detector. Repair or replace the detector

(see internal electronics or
cell).

The type of detector does not

match the measuring channel
configuration.

Connect the correct type of
detector with the
corresponding measuring
channel.
CAUTION
The measuring channel or line
may be damaged.

Negative offset too great
(more than 20% of measuring
scale).

Perform calibration on the
detector and, then, on the unit,
if necessary. If the problem
persists, the cell must be
replaced.

52

Channel in maintenance mode

for more than 30 minutes.

Return the channel to normal
operation by pressing the
Calibration key (Item C, Fig.

4).

Fault indicator light on (in
steady mode) and SUP
displayed.

The measurement is higher
than 100% of the measuring
scale.

To acknowledge the alarm,
the measuring channel must
be switched off and then
switched on again (by
programming).
If the problem persists and the
measurement is not consistent
with reality, the detector must
be calibrated.

An LED does not light up even
though the corresponding
threshold is exceeded and the
buzzer and relay are actuated.

Faulty LED. Perform a general test on the

LEDs by pressing the TEST
key on the keypad and, if the
LED still does not light up,
the programming must be
modified by using the “Unit
programming” menu (buzzer
connected?).

An alarm is triggered, the LED
lights up and the relay is
actuated but there is no audio
alarm.

The buzzer strap is not
correctly positioned.

Fall the buzzer switch
(Fig. 4).

The buzzer is not programmed

as “in service”.

If the audio alarm is wanted,
the programming must be
modified by using the “unit
programming” menu (buzzer

connected?).
The audio alarm stops after 30
s although alarms are still
actuated.

The buzzer is programmed to
operate for 30 seconds only.

If the buzzer is to be sounded

as long as the alarms are

actuated, the programming

must be modified by using the

“Unit programming menu”

(continuous buzzer?).
An alarm is triggered but the

slaving controls are not
actuated.

The relays are faulty.

Short-circuit or open the relay

contact (as applicable) on the

MX48 terminal block (Fig.

12) and, if the slaving

controls operate normally, the

corresponding channel board

must be repaired by an

approved technician.

53

Faulty electrical connections. Short-circuit or open the relay

contact (as applicable) on the

MX48 terminal block (Fig. 12)

and, if the slaving controls still

do not work, the connections

must be checked on the MX48

connector and on the slaving

systems.
An electronic detector is in the
“CALIBRATION” position
and the corresponding channel
of the MX48 unit remains in
normal operation: no flashing
yellow LED.

The channel is not
programmed to detect a
detector in “Calibration”
mode.

If it is so wished, the

programming of this channel

can be modified by using the

“Channel programming” menu

(self-calibration) and choose

"CAL detection : YES".
Impossible to upload data from

the MX48 to a computer.

Faulty electric connections. Check the connections on the

MX48 unit connector (Fig.8)

and the computer. Check that

the cable is satisfactory.
The cable does not match the

2-wire RS485 type of link.

Replace the cable with a

suitable one.
Remote acknowledgement is

impossible.

Faulty electric connections. Check the connections on the

MX48 unit connector (Fig. 8)

and on the punch-type button.
The punch-type button is

faulty.

Replace the punch-type button.

6.2.1. Data printing

EXAMPLE

CAUTION
A computer or a printer management interface must, imperatively, be used to print data.

Computer

MX48

COMPUTER INTERFACE

COMPUTER INTERFACE

Printer

54

6.3. List of spare and replacement parts

DESIGNATION REFERENCE

Complete power unit 6451451
Complete measuring four channels board 6451552
Complete main board (FRONT)
(micro+display)

6451450

Female connector (5 points) 6152857
Line Female connector (9 points) 6152877
“Measuring channel” fuse, 630 mA, time-

delayed

6154627

DC power supply fuse, 12.5 A, time-delayed 6154624
AC power supply fuse, 6.3 A, time-delayed 6154700
Fuse, 125 mA, time-delayed 6154701
Power board relay (DC) 6155745
Common alarm relay 6155752
AC mains relay (110 V AC) 6155761
“Measuring channel” alarm relay 6155752
“Channel actuating” relay 6155744
Lithium battery (on micro board) 6111174
Buzzer 6112214
Toroidal transformer 6111201
Fluorescent display panel 6133521
On/Off switch 6153436
Maintenance screwdriver 6145845
Complete casing MX48 6121547
Complete keyboard (FRONT) 6451453

CAUTION
It is mandatory that replacement parts must be guaranteed OLDHAM S.A. original parts
as, if this is not the case, the safety of the equipment could be affected.

55

77.. DDEETTAAIILLEEDD TTEECCHHNNIICCAALL CCHHAARRAACCTTEERRIISSTTIICCSS

MANUFACTURER

OLDHAM
62000 ARRAS - FRANCE

BOX

- Wall-mounted box dimensions : 500 x 340 x 89

- Function: measuring unit

- Capacity: 4 or 16 measuring channel

- Measurement: continuous

- Storage temperature: -20°C to +55°C

- Operating temperature: -10°C to +45°C

- Relative humidity: 0 to 95% humidity, no condensation

- Protection : IP 65

- Weight : 11 kgs

ILLUMINATED INDICATIONS

- Fluorescent display panel, 2 lines of 16 characters

- 40 light-emitting diodes (power on, gas alarms, faults)

POWER SUPPLIES

- 103 to 122 V AC (in option)

- 207 to 244 V AC

- 21 to 31 V DC

- Power consumptions: 200 VA or 150 W

MEASURING INPUTS

- Active 2-wire or 3-wire shielded cables according to type of detectors

- Resistance in loop mode:

- 3-wire EXPLO: 32 Ω (1,000 m with wire 1.5 mm2 at 20°C)

- 4-20 mA, 2-wire: 64 Ω (2,000 m with wire 1.5 mm2 at 20°C)

- 4-20 mA, 3-wire: 32 Ω (1,000 m with wire 1.5 mm2 at 20°C)

56

RELAY OUTPUTS

- 2 independent measurement alarm relays per channel

- 1 common relay for alarm 3 or audio alarm transfer

- 1 common fault relay

SIGNAL OUTPUTS

- 4-20 mA analog per channel, maximum load resistance = 600 Ω

- Serial: RS 485 / 232 J BUS , common

MISCELLANEOUS OUTPUTS

Alarm remote acknowledgement

STANDARDS

Conformance with European standards CEM and low voltage : EN 50054, 50081 and 50082

CE mark

57

88..

58

80.5

89

500

320

10

102.5

10

387.5

223.5

5

27.5 445 27.5

12.5

6.5

7

PLAN ENCOMBREMENT MX48

Figure N°1

MX48 DIMENSIONAL PLAN

FIGURE 1

59

VUE D'ENSEMBLE DU MX48
(carter ouvert)

Figure N°2

(voir fig N°4)

(voir fig N°3)

(voir fig N°7)

(voir fig N°7)

(voir fig N°1)

Transformateur

Coffret MX48

15 presses-étoupes PG9

Carte afficheur

Carte alimentation

2 vérrouillages 1/4 de tour

Clavier déporté

Compas pour retenir
le couvercle en
position haute

Première carte
voie de mesure

Deuxième carte
voie de mesure

¼ turn latches – 2 off

MX48 box
(see Fig. N°1)

Stay for holding up the
cover

Transformer

Power supply card
(see Fig. N°3)

Second measurement
channel card
(see Fig. N°7)

OVERALL VIEW OF THE MX48

(casing open)

FIGURE 2

15 PG9 cable glands

First measurement

channel card

(see Fig. N°7)

Display card

(see Fig. N°4)

Offset keypad

60

CARTE ALIMENTATION MX48

(

principaux composants)

Figure N°3

Connecteur pour
circuit afficheur

Bornier pour transformateur

Interrupteur général
(repère A)

Filtre secteur

Fusibles 24V

Fusibles secteurs

Bornier acquit

et RS485

Bornier alimentation

Relais alarme
Relais défaut

Rep B

Connector for
display circuit

General switch
(reference A)

Transformer terminal

Mains filter

Mains fuses

Alarm relay

Fault relay

Clear and RS485

terminal

24 V fuses

Ref. B

Power supply terminal

MX 48 POWER SUPPLY CARD

(main components)

61

CARTE LIAISON AVANT MX48
(afficheur,micro,clavier)

Figure N°4

ON/OFF

AL1

AL2
AL3
DEF

- + acquit

enter

Interrupteur de mise en

fonction du buzzer

Buzzer

Connecteur pour carte ligne

Connecteur pour carte

Afficheur fluorescent

Connecteur pour
carte alimentation

Connecteur subD 9 points
femelle (RS232)
(repère A)

Touche programmation (rep D)

Touche calibrage (rep C)

Clavier pour la

maintenance (rep B)

Buzzer switch

Connector for line card

Card connector

Fluorescent display

Power supply
card connector

9-pin female (RS232)
sub D connector
(reference A)

Calibration key (ref. C)
Programming key (ref. D)

Keypad for

Maintenance (ref. B)

MX 48 FRONT LINKAGE CARD

(display, micro, keypad)

FIGURE n° 4

62

FONCTION DES DIFFERENTS POTENTIOMETRES
SUR UNE VOIE DE MESURE MX48

Figure N°5

(programmé suivant le
type de capteur
utilisé)

Une voie
de mesure

Support de plots
de programmation

4 mA

20 mA

I filament

Réglage zéro capteur

Réglage sensibilité

capteur

Programming following

the type of detector used

Zero detector adjustment

detector sensivity

adjustment

FUNCTIONS OF THE VARIOUS POTENTIOMETERS

On the MX 48 measurement channels card

FIGURE 5

Connector for display card

Support for programming the
measurement channels

1

measure-

ment

channel

63

Si vous voulez utiliser la liaison RS485,il faut
connecter le connecteur "bouchon" DB9 male
sur le connecteur DB9 femelle.

(strap interne entre 3 et 4)

BROCHAGE DU CONNECTEUR DE LIAISON RS232 (Rep A-Figure N°4)

Broche N°:
1:
2: TXD RS232
3: RXD RS232
4:
5: GND
6: 485-B
7: 485-A
8:
9:

Liaison

Figure N°6

Liaison

N°1

N°5

N°6

N°9

(-)
(+)

Pin n°

Link RS232

Link RS485

If you wish to use the RS485 link, the male DB9

“plug” connector must be connected to the female
DB9 connector.
(internal strap between 3 and 4)

I

PIN LAYOUT FOR THE RS232 SERIAL LINK

CONNECTOR (Item A – Fig N°4)

FIGURE N°6

64

CARTE VOIES DE MESURE MX48
(principaux composants)

Figure N°7

Voie 1 Voie 2 Voie 3 Voie 4

R2 R1

R2 R1

R2 R1

R2 R1

Voie 1

Voie 2

Voie 3

Voie 4

Connecteur pour
carte afficheur

Support de programmation
des voies de mesures

PotentiomÞtres
de rÚglages

Capteur

125 mA

Ligne

630 mA

Fusibles

Borniers de voie

de mesure

Relais d'alarme
de voie de mesure

Rep A

Connector for display

card

Support for programming

the measurement channels

Potentiometer for

adjustments

Fuses

Fuses

125 mA fuse

630 mA fuse

Measurement

Channel terminals

Ref. A

Measurement

channel alarm
relay

MX 48 MEASUREMENT CHANNELS CARD

(main components)

FIGURE N° 7

65

RACCORDEMENTS ELECTRIQUES SUR LA
CARTE ALIMENTATION MX48

Figure N°8

Acquit 1
Acquit 2

GND
485-A
485-B

-24v

+24v

DEF

DEF

AL3

AL3

NC

Secteur

Secteur

Clear 1 (-)

Clear 2 (+)

GND

485-A (+)

485-B (-)

Mains

Mains

NC

AL3

AL3

DEF

DEF

+ 24 v

- 24 v

ELECTRICAL CONNECTIONS TO THE

MX48 POWER SUPPLY CARD

FIGURE N° 8

66

Figure N°9

1: signal
2: moins
3: plus
4: +
5: ­6:
7:
8:
9:

Capteur

Sortie 4.20 mA

Contact REL AL1

Contact REL AL2

EXEMPLE:REGLAGE DU 4.20 mA SUR LA VOIE 2

AMPEREMETRE

mA

Voie 1 Voie 2 Voie 3 Voie 4

Voie 1

Voie 2

Voie 3

Voie 4

1

2

3

6

7

8

9

+ -

4 mA

20 mA

Channel 1

Chan. 2

Chan. 3

Chan. 4

Channel 1

Channel 2

Channel 4

Channel 3

minus

plus

4.20 mA output

AMMETER

mA

EXAMPLE : ADJUSTMENT OF THE 4.20 mA on the Channel 2

FIGURE N° 9

detector

67

1 2 3 1 2 3

Capteurs explosimétriques "PONT"

Capteurs 4.20 mA - 3 fils

Exemple 1

Exemple 2

CARTE VOIE DE MESURE

Exemples de connexions de capteurs
et de capteurs 4.20 mA Ó 3

Figure N°10

« Pont » explosimetric detectors

Example 1

3-wire 4-20 mA detectors

Example 2

MX48 MEASUREMENT CHANNELS CARD

EXAMPLE OF CONNECTION OF EXPLOSIMETRIC DETECTORS

AND 3-WIRE 4-20 mA DETECTORS

FIGURE N° 10

68

V-

V+

Capteurs 4.20 mA 2 fils

2

4

7

2

4

1

Capteur 1 Capteur 2

R=2x3.9 K en

Note: La résistance de 2.7 K est à mettre en bout de ligne
(sur le dernier capteur = 3 au maximum)

Capteurs incendie
(Ionique ou Optique)

EXEMPLES DE CONNEXION DE CAPTEUR INCENDIE
ET DE CAPTEUR 4.20 mA A 2 FILS
SUR LA CARTE VOIE DE MESURE MX48

Figure N°11

3131

Exemple 1

Exemple 2

ATTENTION a la configuration de la voie de mesure

EXAMPLES OF CONNECTION OF 2-

WIRE 4-20 mA DETECTORS AND FIRE

DETECTORS ON THE MX48

MEASUREMENT CHANNELS CARD

FIGURE N°11

1 3 3 1

2 2 7 7 4

4

R=2x3.9K Ù in / /

Fire detectors (Ionic

or optical)
Example1

Ù is to be placed at the end of

line

Note : The 2.7 k resistor (on the last

detector = 3 maximum

Detector 1

Detector 2

ATTENTION to the configuration of the measurement channel

V-

V+

2-wire 4-20 mA

Example 2

69

DETAIL DES CONNEXIONS SUR LE BORNIER
D'UNE VOIE DE MESURE DE MX48

Figure N°12

1: signal
2: moins
3: plus
4: +
5: ­6:
7:
8:
9:

Capteur

Sortie 4.20 mA

Contact REL AL1

Contact REL AL2

1

2

3

4

5

6

7

8

9

minus

signal

plus

detector

4-20 mA current output

Contact REL AL1

Contact REL AL2

DETAILS OF CONNECTIONS OF A TERMINAL BLOCK TO THE

MX48 MEASUREMENT CHANNELS

FIGURE 12

70

2

1

1

2

3

4

5

6

7

R

1
R
2

1.8K

6.8K

Cable 3xn Blindé

Bornier de
Capteur : Type A

R

Bornier de voie de
mesure MX48
(voir fig 12)

6 Maxi en boucle
entre 2 et 3 MX48

BRANCHEMENT D'UN CAPTEUR FLAMME EQUIPE
D'UN BORNIER TYPE A SUR LE MX48

Figure N°13

MX48 terminal block

(See figure 12)

Cable 3xn shielded

6 max in loop

between 2 and 3 MX48 units

CONNECTION OF A FLAME DETECTOR

EQUIPPED WITH TERMINAL BLOCK OF TYPE A

FIGURE 13

Detector terminal

block : Type A

71

5

2

1

2

3

7

9

10

R
1

R
2

1.8K

6.8K

Cable 3xn Blindé

Bornier de
Capteur : Type B

R

Bornier de voie de
mesure du MX48
(voir fig 12)

6 Maxi en boucle
entre 2 et 3 MX48

BRANCHEMENT D'UN CAPTEUR FLAMME EQUIPE
D'UN BORNIER TYPE B SUR LE MX48

Figure N°14

Detector terminal

block : Type B

MX48 terminal block

(See figure 12)

Cable 3xn shielded

6 max in loop

between 2 and 3 MX48 units

CONNECTION OF A FLAME DETECTOR

EQUIPPED WITH TERMINAL BLOCK OF TYPE B

FIGURE 14

72

CONNECTION OF A FLAME DETECTOR

EQUIPPED WITH TERMINAL BLOCK OF TYPE C

FIGURE 15

MX48 terminal block

(See figure 12)

Detector terminal

block : Type C

Cable 3xn shielded

6 max in loop

between 2 and 3 MX48 units

R 1 2 3 1 2 4 5 6 7 8

1.8K

6.8K

R2 R

1

73

11

1

2

H A

G 12B

1

2

Isolation Galvanique

Bornier de capteur:
type A ou C

Cable 3xn blindé

6 Maxi en boucle

entre 2 et 3 MX48

Bornier de voie de
mesure du MX48
(voir fig 12)

3

R

Le relais du capteur reste utilisable
L'isolation galvanique est située à proximité
de la centrale

Remarque

EXEMPLE D'UTILISATION DU SIGNAL 4-20 mA FOURNI PAR UN CAPTEUR

FLAMME (UV/IR ou IR3) EQUIPE D'UN BORNIER DE TYPE A ou C

Figure N°16

Detector terminal block :

Type A or C

MX48 terminal block

(See figure 12)

Cable 3xn shielded

6 max in loop

between 2 and 3 MX48 units

EXAMPLE OF UTILIZATION OF THE 4-20 mA SIGNAL SUPPLIED BY A FLAME
DETECTOR (UV/IR OR IR3) EQUIPPED WITH TERMINAL BLOCK TYPE A OR C

FIGURE 16

Galvanic isolator

Remark : The detector relay can be used in local mode.

The galvanic isolator is located in the immediate

vicinity of the MX48 unit.

74

5

2

1

+

3

7

9

-

1

4

2

10

5

6

7

R
1

R
2

R
1

R
2

Capteur
Bornier Type: B

Capteur
Bornier Type: A

Alimentation DC
auxiliaire

1.8K

6.8K

1.8K

Remarque: Circuit alimentation en étoile
Circuit signaux en série (boucle)
R1: uniquement sur le dernier capteur (5 au maximum)

EXEMPLE D'UTILISATION DE CAPTEURS

EQUIPES INDIFEREMMENT DE CONNECTEUR A OU

ET ALIMENTATES PAR UNE ALIMENTATION DC

Bornier de voie de
mesure du MX48
(voir fig 12)

Figure N°17

Detector terminal block :

Type B

Detector terminal block :

Type A

Auxiliary DC power supply

MX48 terminal block

(see figure 12)

Remark : Star-connected power circuit

Signal circuit in series (loop)
R1 : only on the last detector (3 maxi)

EXAMPLE OF UTILIZATION OF FLAME DETECTORS EQUIPPED WITH EITHER

CONNECTOR A OR B AND SUPPLIED WITH AUXILIARY DC POWER

FIGURE 17

75

111

+

2

-

H A

G

12

B

1

2

Voie MX..

I.G

CAPTEUR

Voie MX..

I.G

CAPTEUR

Voie MX..

I.G

CAPTEUR

BOITIER LOCAL
AVEC ALIM
ET BORNIER

REPORT SIGNAL

X x 2 x m

2

4 x n

2

4 x n

2

4 x n

2

EXEMPLE D'UTILISATION
BOITIER D'INTERCONNEXION
UNE ISOLATION

- 1 seul capteur par voie de mesure MX48

- Le relais du capteur reste utilisable localement

- L'isolation galvanique est située à proximité immédiate de la centrale MX48

SYNOPTIQUE TYPE D'INSTALLATION A MULTIPLIER PAR NOMBRE DE ZONES DANS INSTALLATION

ALIM

Isolation Galvanique

Boitier local comprenant alimentation
+ bornier report (Hors zone classée)

Bornier
du capteur Type: A

Cable 2xm blindé
250 Maxi en boucle
entre 1 et 2 MX..

Cable 2xn blindé
17 Maxi en boucle
entre 1 et 2 capteurs

Figure N°18

Bornier de voie de
mesure du MX48
(voir fig 12)

Detector terminal block :

Type A

EXAMPLE OF UTILIZATION OF AN INTERCONNECTION BOX

AND A GALVANIC ISOLATOR

FIGURE 18

Local box including power unit

+ transfer terminal block (outside classified
areas)

Galvanic isolator

MX48 terminal block

(see figure 12)

Cable 2xn shielded

250 max in loop

between 1 and 2 MX48

Cable 2xn shielded

17 max in loop between

1 and 2 detector

TYPICAL INSTALLATION BLOCK DIAGRAM TO BE MULTIPLIED BY NUMBER OF AREAS IN INSTALLATION

Channel MX..

Channel MX..

Channel MX..

DETECTOR

DETECTOR

DETECT OR

Local box with PWR

unit and signal transfer
terminal block

- a single detector per MX48 measuring channel

- the detector rely can be used in local mode.

- The galvanic isolator is located in the immediate vicinity of the MX48 unit.

76

Bornier du
Ventostat

1

2

3

Boutons
Ne pas toucher SVP

+DC

0V

Signal: 4-20mA

Bornier de voie de
mesure du MX48
(voir fig 12)

BRANCHEMENT D'UN CAPTEUR
TYPE VENTOSTAT VT SUR LE

Figure N°20

MX48 terminal block

(see figure 12)

Ventostat VT

terminal block

Buttons

Please do not touch

CONNECTION OF A CO2 DETECTOR

OF VENTOSTAT VT TYPE

FIGURE 20

77

Atmosphère explosible

Atmosphère explosible

Barrière de Si (écretteur)
Type Z787/EX

Barrière de Si (écretteur)
Type MTL787S+

2

1

4

3

3 1

V-V+

5

7

8 6

1

2

4

3

3

1

V+

V-

Bornier

Bornier

Capteur CTX/COX 100

Capteur CTX/COX 100

1 3 1 3

autres capteursautres capteurs

EXEMPLES DE RACCORDEMENTS DE
AVEC DES BARRIERES DE

Figure N°21

Other detector

EXAMPLES OF CONNECTION OF

DETECTORS WITH Si BARRIERS

FIGURE 21

Detector CTX/COX100

Si barrier (clipper)

Type MTL787S+

Explosive atmosphere

Explosive atmosphere

Si barrier (clipper)

Type Z787/EX

Other detector

Detector CTX/COX100

Terminal

block

Terminal
block

78

S

+

+

-

S

BornierBornier

1 2 3 1 3

Capteurs 4.20 mA 3 fils autres qu'OLDHAM Capteurs 4.20 mA 2 fils autres qu'OLDHAM

CAPTEURS 4.20 mA AUTRES QU'OLDHAM

(alimentés par la centrale MX48)

Figure N°22

Terminal

block

Terminal

block

4-20 mA DETECTORS OTHER THAN OLDHAM MODELS

(Power-supplied by MX48 unit)

FIGURE 22

2-wire 4-20 mA detectors other than OLDHAM

models

3-wire 4-20 mA detectors other than OLDHAM

models

79

EXEMPLE DE CABLAGE EN "PARALLELE"

DE 2 CAPTEURS CTX50 (5 Maximum)

Figure N°23

1 3

V-V+V-V+V-V+V-

V+

Capteur TOX 1 Capteur TOX 2

EXAMPLE OF “PARALLEL” WIRING OF 2 DETECTORS OF

CTX300 “Co Parking” (5 maximum)

FIGURE 23

Detector TOX 1

Detector TOX 2

80

EXEMPLE DE RACCORDEMENT D'ORGANES EXTERNES SUR LES

CONTACTS DE RELAIS ALARMES 1 et 2 D'UNE VOIE DE MESURE DE MX48

Figure N°24

Electrovanne

Sirène

230 VAC

EXAMPLE OF CONNECTION OF EXTERNAL DEVICES TO THE ALARM 1 AN 2 RELAY CONTACTS OF A MX48

MEASURING CHANNEL

FIGURE 24

Solenoid valve

Siren

81

EXEMPLE DE RACCORDEMENT D'UN ENREGISTREUR A 2 ENTREES

SUR LA SORTIE 4-20 mA DE 2 VOIES DE MESURE

Figure N°25

ENREGISTREUR

E2 E1-

+

-

+

-

EXAMPLE OF CONNECTION OF A 2 INPUTS RECORDER TO THE 4-20 mA OUTPUT OF TWO

MESURING CHANNEL

FIGURE 25

Recorder

82

OOLLDDHHAAMM SSAA -- GGAASS DDEETTEECCTTIIOONN DDIIVVIISSIIOONN

LLIIMMIITTEEDD WWAARRRRAANNTTYY

As per sales conditions

RREELLIIAABBIILLIITTYY -- CCOONNTTRROOLLSS

Your satisfaction is our primary concern. This means our equipment and our technical departments
must be reliable, and the quality of our production is essential to achieve that reliability. Quality is
ensured by extremely strict verifications carried out during production, at the end of manufacture
and before shipment. (All shipped equipment is configured to meet your requirements). These steps
help to save time during equipment start-up and avoid additional costs.

SSTTAARRTT--UUPP

Entrusting the start-up of your equipment to our expert technicians gives you the guarantee of
additional safety.

FFIIEELLDD SSEERRVVIICCIINNGG

Our AFTER-SALES SERVICE technicians are ready to service your equipment very quickly on
your site. This performance is made possible by the efficient network of our branches throughout
the world.

For any specific technical question, please contact our Service Responsible person, Mr.
MIGUEL RIESGO, 00 33 3 21 60 80 86.

FFAACCTTOORRYY RREEPPAAIIRRSS

For any problem which cannot be solved in the field, a team of SPECIALIZED TECHNICIANS is
on hand to ensure the quick repair of your equipment sent to our plant in ARRAS, France. In this
way, OLDHAM SA undertakes to keep the downtime for your equipment to a minimum.

83

MMAAIINNTTEENNAANNCCEE CCOONNTTRRAACCTT

REGULAR MAINTENANCE IS NEEDED to ensure that your equipment meets the stipulated
performance levels, as well as to guarantee the safety.

OLDHAM SA CAN offer you MAINTENANCE CONTRACTS.

TTRRAAIINNIINNGG

OLDHAM SA has a fully-equipped TRAINING Department: a number of engineers specialized

as instructors, conference rooms, equipment available for practical exercises, computer equipment,
display equipment, etc..

You are thus assured that your personnel will receive all the TRAINING REQUIRED to use our
equipment and perform first-level maintenance. This training can cover our entire product range.

OLDHAM SA organizes SCHEDULED TRAINING SESSIONS (1 week) at the head office in
ARRAS. Special training programs can however be set up at the head office or on your site.

QQUUAALLIITTYY

With the assurance that we comply with ISO STANDARDS, our users can have complete
confidence in OLDHAM SA QUALITY.

AADDVVAANNTTAAGGEESS

OLDHAM SA is represented in major countries worldwide with sales and service centers.

OLDHAM SA uses all the modern means of communication, such as e-mail, fax and Internet.

OLDHAM SA is always present at large trade events, i.e. regional, national and international
EXHIBITIONS.