ENMET MX-42A User Manual

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Page 1

ENMET

ENMET Corporation

ENMETENMET

PO Box 979 Ann Arbor, MI 48106-0979

NGUARD

MX42A C

PERATION

& M

ANUAL

ONTROL

AINTENANCE

Manual Part Number 80003-042 October 1999 MCN-358, 12/06/06

Page 2

Page 3

ABLE OF CONTENTS

1.0 I

NTRODUCTION

.................................................................................................................................... 1

1.1 Unpack ......................................................................................................................................................1

1.2 Check Order...............................................................................................................................................1

1.3 Serial Numbers ..........................................................................................................................................1

2.0 F

EATURES

3.0 I

NSTALLATION AND CONNECTION

.......................................................................................................................................... 2

.......................................................................................................... 3

3.1 Installation.................................................................................................................................................3

3.1.1 Placement of Control........................................................................................................................3

3.1.2 Placement of Sensor/Transmitters.....................................................................................................3

3.2 Electrical Connection of the MX42A Control .............................................................................................4

3.3 Connection of the MX42A Control to the Sensor/Transmitter .....................................................................5

3.3.1 Type and Connection of Sensor/Transmitters ....................................................................................5

3.4 Connection of the Control to External Devices............................................................................................6

3.4.1 Connection to Auxiliary Alarms........................................................................................................6

3.4.2 4-20mA Current Output....................................................................................................................6

4.0 S

TART-UP AND OPERATION

.................................................................................................................. 7

4.1 Configuration of Alarms and Servocontrol..................................................................................................9

4.2 Characteristics of alarm triggering..............................................................................................................9

4.3 Adjustment of alarm thresholds and averaging times of alarm 3 ................................................................11

4.4 Outputs....................................................................................................................................................12

4.4.1 Relays ............................................................................................................................................12

4.4.2 4-20 mA Current Output.................................................................................................................12

5.0 M

AINTENANCE

5.1 Adjustment of sensor/transmitter and the MX 42A C

6.0 T

ROUBLESHOOTING

7.0 S

PECIFICATIONS

...................................................................................................................................13

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unit.............................................................13

............................................................................................................................14

.................................................................................................................................15

7.1 Physical...................................................................................................................................................15

7.2 Display ....................................................................................................................................................15

7.3 Power supply ...........................................................................................................................................15

7.4 Measurement inputs.................................................................................................................................15

7.5 Alarm ......................................................................................................................................................16

7.6 Control functions .....................................................................................................................................17

7.7 Relays......................................................................................................................................................17

7.8 Output......................................................................................................................................................17

8.0 WARRANTY....................................................................................................................................18

IGURE

IST OF ILLUSTRATIONS

1: I

NTERIOR VIEW OF

2: M

OUNTING

3: C

ONNECTION OF POWER TERMINAL

4: C

ONNECTION OF SENSOR/TRANSMITTER TERMINAL

5: C

ONNECTION TO EXTERNAL DEVICES

6: F

RONT VIEW OF

7: L

OCATION OF MICROSWITCHES

8: R

ELAY JUMPER AND

9: P

OTENTIOMETER LOCATION

MX42A C

MX42A......................................................................................................... 2

ONTROL

.................................................................................................... 3

............................................................................................ 4

.......................................................................................... 6

MX42A C

ONTROL

............................................................................................. 8

..................................................................................................10

4-20MA POT L

OCATION

......................................................................................................13

...................................................................... 5

............................................................................12

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MX42A C

1.0 Introduction

1.0 Introduction1.0 Introduction

OTE

ONTROL

The MX 42A C carrying gases.

The MX 42A C located in a place to be monitored. The measurement from the detector is displayed on the MX 42A C compared to alarm thresholds. Should alarm thresholds be exceeded, the MX 42A C which can be used for the control of outside devices (horn, telephone call, exhaust fans, etc.).

OTE

: This instrument is also available as a 2 channel control.

ONTROL

is an apparatus for the detection and measurement of various combustible, toxic and oxygen-

has up to 4 independent measuring channels. Each channel is connected to a gas detector

ONTROL

ENMET Corporation

unit actuates relays

: All specifications stated in this manual may change without notice.

ONTROL

1.1 Unpack

Unpack the MX 42A and examine it for shipping damage. If such damage is observed, notify both ENMET customer service personnel and the commercial carrier involved immediately.

Regarding Damaged Shipments

OTE

: It is your responsibility to follow these instructions. If they are not followed, the carrier will

not honor any claims for damage.



This shipment was carefully inspected, verified and properly packaged at our company and delivered to the carrier in good condition.



When it was picked up by the carrier at ENMET, it legally became your company’s property.



If your shipment arrives damaged:

• Keep the items, packing material, and carton “As Is.” Within 5 days of receipt, notify the carrier’s local

office and request immediate inspection of the carton and the contents.

• After the inspection and after you have received written acknowledgment of the damage from the carrier,

contact ENMET Customer Service for return authorization and further instructions. Have your Purchase Order and Sales Order numbers available.



ENMET either repairs or replaces damaged equipment and invoices the carrier to the extent of the liability coverage, usually $100.00. Repair or replacement charges above that value are your company’s responsibility.



The shipping company may offer optional insurance coverage. ENMET only insures shipments with the shipping company when asked to do so in writing by our customer. If you need your shipments insured, please forward a written request to ENMET Customer Service.

and

Regarding Shortages

If there are any shortages or questions regarding this shipment, please notify ENMET Customer Service within 5 days of receipt at the following address:

ENMET Corporation

680 Fairfield Court

Ann Arbor, MI 48108

734-761-1270 734-761-3220 Fax

1.2 Check Order

Check, the contents of the shipment against the purchase order. Verify that the MX 42A is received as ordered. If there are accessories on the order, ascertain that they are present. Check the contents of calibration kits. Notify ENMET customer service personnel of any discrepancy immediately.

1.3 Serial Numbers

Each MX 42A is serialized. These numbers are on tags on the equipment and are on record in an ENMET database.

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ENMET Corporation MX42A C

Display

Visual Alarms

Terminals

Power Switch

2.0 Features

2.0 Features2.0 Features

See F

IGURE

Feature Description

Enclosure For wall mounting made of PVC

(length: 13.38, height: 11.81, depth: 4.21 inches) with internal coating for RFI protection.

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Power Supply Display Inputs 4, for 4-20mA sensor/transmitters which may have combustible, toxic or oxygen sensors. Output Audio Alarms

Visual Alarms Relays

AC or DC LCD display of the measurements

4-20 mA output per channel (< 1 mA for fault, 2 mA for maintenance) Resettable buzzer for alarms or a fault conditions, a total of 3:

• 2 increasing or decreasing thresholds, with manual or automatic clearance.

• 1 increasing or decreasing threshold, automatic clearance.

5 LED per channel A total of 10 relays distributed as follows:

• 2 relays per channel (NO or NC) for the first two alarm thresholds

• 1 relay common to the channels for the third alarm threshold (or the remote

transmission of the alarm on programming)

• 1 relay common to the channels for detector faults

Enclosure

Microswitches

1 set per channel

5 LED per channel

Power Supply

Mounting Holes 4 pl

Buzzer

Buzzer Jumper See caution in Section 4.0

Relays, total of 10

Input / Output

Fuses

Cable glands

Figure 1: Interior View of MX42A

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MX42A C

3.0 Installation and Connection

3.0 Installation and Connection3.0 Installation and Connection

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3.1 Installation

3.1.1 Placement of Control

The MX 42A C ventilated place where it can be watched, such as a guard house, control room or security service area.

To mount the Control see F 4 mounting holes, with centers of 12.40 x 9.65 inches, use #10 or 5 mm screws.

AUTION

: There must be 12 inches of clearance above the MX 42A C

3.1.2 Placement of Sensor/Transmitters

Their location depends on three main factors:

♦ Density of gas to be detected: high for gases lighter than air and low for gases heavier than air ♦ Leak point: determination of the probable source of a leak ♦ In the flow of air in ventilated rooms.

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maintenance.

can be installed in any place with an unclassified atmosphere. It should be put in a well

IGURE

2 mounting demotions:

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so the cover can be opened for

ENMET Corporation

Front View

Bottom View

Figure 2: Mounting MX42A C

Front View with Lid Open

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ENMET Corporation MX42A C

3.2 Electrical Connection of the MX42A Control

Power supply: connect the power supply wires to the terminal blocks of the Control. Located on the PC Board at the bottom of the enclosure.

OTE

: Before installation, turn off the MX 42A C

bottom left corner.

ARNING

Continuous gas detection and alarm systems (110VAC/220VAC / 24VDC/12VDC powered) become

inoperative upon loss of primary power. Contact factory for specifications and pricing of backup battery systems.

See Figure 3 for the connection of the power terminals.

• AC, Ground labeled TERRE on the board AC, High labeled PHASE on the board AC, Neutral labeled NEUTRE on the board terminals, 115 VAC (103 V to 122 V), 50/60 Hz, are protected by F1 and F3 with 1.25A time-delay fuses.

• + DC labeled + CONTINU on the board – DC labeled – CONTINU on the board terminals, 24 V (19 V to 32 V), DC is protected by F2 a 4A fuse.

• Optional: 230 VAC (207 V to 244 V), 50/60 Hz, is protected by F1 and F3 with 630mA time-delay fuses.

A label on the enclosure gives the power supply voltages.

 OFF is up  ON is down

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using the toggle switch, S2, located inside the unit in the

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Switch S2

110VDC Or Optional

220VDC If Installed

Not Field Convertible

110V

VDC Connections

Note: Labeling on board will appear different then shown in this figure.

Figure 3: Connection of Power Terminal

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MX42A C

Channel 1

Channel 3

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3.3 Connection of the MX42A Control to the Sensor/Transmitter

3.3.1 Type and Connection of Sensor/Transmitters

Various types of sensor/transmitters can be connected.

 Two wire 4-20mA, toxic gas or oxygen detection sensor/transmitters. Such as, ENMET SDS and EN models.

Negative in, Signal (wire 1) and Positive in +24 VDC (wire 3) of each channel. See figure 4

 Three wire 4-20mA combustible or toxic gas and oxygen sensor/transmitters. Such as, ENMET SDS-97D and

EX5000 models. Signal (wire 1), DC-GND (wire 2) and +24 VDC (wire 3). See figure 4

 If used with other manufactures sensor/transmitters, follow installation instructions procedures supplied by the

sensor/transmitter manufacturer, or contact your ENMET representative or ENMET Corporation.

Specifications of cable:

• Using shielded cables is necessary for RFI protection.

• The shield of the cable must be connected to wire #2 (DC ground) of the C

ONTROL

ENMET Corporation

Example: 2 wire 4-20mA

Toxic Gas or Oxygen

Example: 3 wire 4-20mA

Combustible or Toxic Gas

DC-G

Signal ( – )

24VDC ( + )

Signal ( – )

24VDC ( + )

Note: Labeling on board will appear different then shown in this figure.

Figure 4: Connection of Sensor/Transmitter Terminal

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ENMET Corporation MX42A C

3.4 Connection of the Control to External Devices

Auxiliary alarms should be powered from an independent power source separate form the instrument power to avoid alarm failure due to controller malfunction.

3.4.1 Connection to Auxiliary Alarms

The MX 42A C telephone callers, exhaust fans, etc.

The relays are assigned to functions as follows:

For Each Channel:

• one relay, RELAY 1, actuated by alarm 1

• one relay, RELAY 2, actuated by alarm 2

For All Channels:

• A common relay, CR RELAY, actuated by the high alarm of any channel

• One relay, FAULT RELAY, associated with faults detected on any channel such as: detector malfunctions, poor

electrical connections, signal current is 0mA or signal current is greater then 25mA.

An example of a connection is shown in Figure 5

• Example A: a light and horn, connected to RELAY 2 of channel 4

• Example B: a light and horn, connected to RELAY 2, of channels 1 – 4

OTE

: Contact rating of the MX42A C

must be added if the devices to be controlled require higher current requirements.

3.4.2 4-20mA Current Output

For each channel, the MX 42A C a recorder or data logger. In a loop configuration, the maximum resistance is 600 ohms. The 4-20 mA outputs have common ground connections.

ONTROL

has 10 relays that can be used to control external devices such as: horns, solenoid valves,

ONTROL

relays is 2 A for 85 V

to 240 V

or up to 30 VDC. External relays

has a 4-20 mA output which can be used for the transfer of measurements to

ONTROL

Power

Source

Light

Horn

Power

Source

Light

Horn

Example A Example B

Note: Labeling on board will appear different then shown in this figure.

Figure 5: Connection to External Devices

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MX42A C

4.0 Start-up and Operation

4.0 Start-up and Operation4.0 Start-up and Operation

ONTROL

ENMET Corporation

Once the control has been installed and connected, turn it on with the toggle switch, S2, located on the inside bottom left corner.

 OFF is up  ON is down

When the MX42A C the buzzer for about a minute. All alarms are inhibited during this test mode. Then, the MX 42A C

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is turned on it initiates a test mode, checking the proper operation of the LEDs, LCD and

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channel 1 for one minute before starting the normal display cycle of each channel.

2 cases can happen:

a) If: Channel 1 is in operation

The display indicates INIT and then displays the actual measurement value, and the green LED blinks indicating the channel is in operation, the yellow LED is on steady indicating the channel on display.

b) If: Channel 1 is off

The display indicates STOP, the yellow LED is on steady the channel on display and the green LED is off indicating the channel is not in operation.

During the normal display cycle of all channels, each channel is scanned by the MX 42A C

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every 9 seconds,

and the measurement is displayed for 3 seconds. On the front of the control F

IGURE

6, the switches 1, 2, 3 and 4 are used to display the respective channel

measurement for one minute on the display. After one minute, the display returns to normal display cycle. The TEST switch triggers the lighting of all signal lamps, all segments of the LCD display and the functioning of the

buzzer. The BUZZER switch resets the alarms and clears the buzzer alarm.

For each channel, there are 5 LEDs to indicate the status of the channel.

displays

LED Description

Display/Operation

[ Lighting bolt on front panel ]

Paired yellow LED to the left and green LED to the right:

 When the green LED is blinking the channel is in test mode.  When the green LED is on steady the channel is in operation.  When the yellow LED is on steady the channel is being displayed.

AL1 [ Bell on front panel ] Alarm 1 red LED when in alarm AL2 [ Bell on front panel ] Alarm 2 red LED when in alarm AL3 [ Bell on front panel ] Alarm 3 red LED when in alarm Fault signal / Calibration signal

[ Wrench on front panel ]

Lower most yellow LED

 When the yellow LED is on steady it indicates a malfunction on the line.  When the yellow LED is blinking the channel is in calibration mode.

In case of an alarm or fault, the audio alarm on the control panel latches, to clear press the BUZZER switch. The LEDs will clear when the channel is no longer in alarm condition.

OTE

: The buzzer can be inhibited by moving the jumper on the top right corner of the display board to the OFF

position. See figure 1 for location of jumper.

AUTION

: There is no visual indication that the buzzer is in inhibited. Return jumper to ON position before normal

operation.

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ENMET Corporation MX42A C

MX42A

MX42AMX42A

MX42A

Fault/Calibration

Channel

DEF



123

Display/Operation Yellow & Green LEDs

AL1 





Alarm 1

AL2 





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Display

Alarm 2 Red LED

Alarm 3 Red LED

Yellow LED

OTE

: In some applications, slight electronic noise between the Sensor/Transmitter and the Control can cause

fluctuations in the display reading. These minor fluctuations are considered to be insignificant in terms of the range, detection limit and alarm values of the gas being monitored.

AL3 





Figure 6: Front View of MX42A Control

Switches

TEST

Test Switch

Buzzer Switch

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MX42A C

ONTROL

ENMET Corporation

4.1 Configuration of Alarms and Servocontrol

AUTION

: The procedures and adjustments described in the following sections must be performed by authorized

personal. Failure to follow instructions may jeopardize accurate measurements.

4.2 Characteristics of alarm triggering

There are three alarm thresholds associated with each channel:

 Threshold 1 controls Alarm 1 LED and relay 1.  Threshold 2 controls Alarm 2 LED and relay 2.  Threshold 3 controls Alarm 3 LED and the CR relay (common relay).

OTE

: The CR relay is common to all channels.

For each channel, a block of microswitches is located on the display board and is used to program the characteristics of alarm thresholds and operation of each channel. See F

1 2 3 4 5 6 7 8 9 10

Example of Microswitch in normal operation mode, grayed areas indicated position of each switch

• Microswitch position 1: Sets the triggering of alarms 2 & 3 by increasing or decreasing values. D

OWN

is for increasing value and UP if for decreasing value. Down is normal

• Microswitch position 2: Is used to set alarm 3 on either delay time or averaging. D

OWN

is delay time: See microswitches 9 & 10 for setting time delay

UP is averaging: Is set to time delay at the factory.

IGURE

7 and Table 1.

• Microswitch position 3: Is used to set clearance of audio Alarms 1 and 2 to latching or non-latching:

 D

OWN

is latching/manual clearance:

When a threshold is reached, the LED and relay are activated. When a threshold decreases, the signals are deactivated by manually pressing BUZZER button.

 UP is non-latching/automatic clearance:

When a threshold is reached, the associated LED and relay are activated. When the threshold decreases, the signals are automatically deactivated. This is the factory set position.

OTE

: Alarms 1 and 2 are set together to the same condition, alarm 3 has automatic clearance

• Microswitch position 4: Sets the triggering of alarms 1 by increasing or decreasing values. D

OWN

is for increasing value and UP is for decreasing value. Down is normal

• Microswitch position 5: Is used for European parking garage regulations. D

OWN

is normal operation and UP parking garage mode.

• Microswitch position 6: Is used to set control in adjustment or calibration mode. D

OWN

is for adjustment of display settings and UP is for calibration of sensor/transmitter.

OTE

: microswitch 6 is disabled when microswitch 7 is in normal operation mode.

• Microswitch position 7: Is used to place the channel in normal operation or maintenance mode. D

OWN

is maintenance mode and UP is normal operation.

• Microswitch position 8: Is used to place channel in operation or take it out of operation. D

OWN

is in operation and UP is out of operation.

• Microswitch position 9 & 10: Are used to set the time delay of alarm 3rd relay common to the channels.

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ENMET Corporation MX42A C

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Figure 7: Location of Microswitches

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MX42A C

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4.3 Adjustment of alarm thresholds and averaging times of alarm 3

The alarms are adjusted at the factory. However, these adjustments can be changed.

OTE

: The fault lamp blinks to signal the channel is in maintenance mode. The maintenance mode lasts for 30

minutes. After which, the channel automatically changes over to fault. Only one channel can be programmed at a time. When a channel is in the maintenance mode, the 4-20 mA current output is set to 2 mA.

1 2 3 4 5 6 7 8 9 10

Example of Microswitch in Maintenance mode gray areas indicate position of each switch

For the selected channel, set the microswitches as follows:

 Microswitch 8: in operation  Microswitch 7: maintenance  Microswitch 6: adjustment

In this mode, the pushbutton switches 1, 2, 3 and 4 have the following functions:

 pushbutton switch 4 = to cycle through functions and ENTER  pushbutton switch 3 = to view setting of function  pushbutton switch 2 = to increase setting of function  pushbutton switch 1 = to decrease setting of function

The following is the cycle of functions:

 AL1: alarm 1 threshold  AL2: alarm 2 threshold  AL3: alarm 3 threshold  T1: averaging time of alarm set at factory to 15 minutes.  PT: sets the position of the decimal point according to the sensor/transmitter measuring range. See S/T

manual for correct setting.

Example: To positioning alarm 3 at 150 for channel 2:

 On the microswitch block of channel 2, position microswitch 7 to

LCD displays AL1.

 Press pushbutton switch 4 twice. The LCD displays AL3.  Press pushbutton switch 3. The LCD displays the present value of the alarm 3 threshold.  Using pushbutton switches 1 and 2, to decrease or increase the setting, set the desired threshold.  Press the pushbutton switch 4 to ENTER. The threshold is now set.  Return Microswitch 7 to normal operation position.  Leave Microswitches 6 and 8 as above.

MAINTENANCE

ENMET Corporation

, 6 to

ADJUSTMENT

. The

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ENMET Corporation MX42A C

Jumpers

4.4 Outputs

4.4.1 Relays

With the position of jumpers S3 through S12, the contacts of the relays for each channel can be selected. The contacts can be either open or closed during the alarm condition. see F closed.

This selection is made by moving the corresponding jumper. The standard factory setting, relays (except for the fault relay) are energized in the non-alarm condition.

4.4.2 4-20 mA Current Output

A 4-20 mA output is available on the terminal block for each channel. It serves to connect the MX 42A C chart recorder or to any other data acquisition system (maximum load resistance is 600 ohms).

OTE

: The 4-20 mA output is preset in the factory: 4 mA corresponds to a display of 0 and 20 mA corresponds to a

full-scale value. Potentiometers P5, P6, P7 and P8 (for channels 1, 2, 3 and 4 respectively) adjust the 4 mA. Potentiometers P21, P22, P23 and P24 (for channels 1, 2, 3 and 4 respectively) adjust the 20 mA

IGURE

8. The factory set position is normally

ONTROL

to a

P21

P22

P23

P24

Figure 8: Relay Jumper and 4-20mA POT Location

Jumper position for NC contact

Jumper position for NO contact

S3 to S12

Page 17

MX42A C

5.0 Maintenance

5.0 Maintenance5.0 Maintenance

ONTROL

The MX 42A C

ONTROL

requires practically no servicing at all. Nevertheless, since it is a safety device, it is still

necessary to calibrate the detectors periodically.

AUTION

: The procedures and adjustments described in the following sections must be performed by authorized

personal. Failure to follow instructions may jeopardize accurate measurements.

ENMET Corporation

5.1 Adjustment of sensor/transmitter and the MX 42A C

ONTROL

unit

adjustment consists of calibrating the zero of the sensor/transmitter in clean air and the gain of the sensor/transmitter to the reference gas.

For each channel, set the microswitches as follows

 Microswitch 8 = in operation  Microswitch 7 = maintenance  Microswitch 6 = calibration

In the maintenance mode, the Control current output is set to 2 mA.

OTE

: If left in calibration mode, the channel automatically changes over to fault after 30 minutes.

1 2 3 4 5 6 7 8 9 10

Example of Microswitch in calibration mode

gray areas indicate position of each switch

Voltmeter readings are taken at test points of sensor/transmitter refer to S/T manual for location and across OUTPUT+ , 4-20mA– terminal for each channel of the MX42A C

Adjustment of MX42A C

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zero

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. See F

IGURE

4, 9.

With the sensor/transmitter in clean air, set the output of the sensor/transmitter to zero (4mA). Then use MX42A potentiometer: F

IGURE

9, Zero Adjust

 P9 for channel 1  P12 for channel 2  P15 for channel 3  P18 for channel 4

to display 0000 on the channel in question. If the ambient air at S/T is not free of contamination, use air from a cylinder.

Adjustment MX42A C

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gain

• Apply the correct calibration gas to the sensor/transmitter, and set the sensor/transmitter output to appropriate output

see S/T manual for proper setting.

• Adjust the

CONTROL

display to the value of the calibration gas using potentiometer: F

IGURE

9, Span Adjust

 P11 for channel 1  P14 for channel 2  P17 for channel 3  P20 for channel 4

Remove Calibration Gas and return to the microswitch configuration to normal operation:

 Microswitch 8 = in operation  Microswitch 7 = normal  Microswitch 6 = calibration

Terminal Cannel 1

P11

P14

P12

P17

P15

P20

P18

Figure 9: Potentiometer Location

Span Adjust POTs

Zero Adjust POTs

Page 18

ENMET Corporation MX42A C

6.0 Troubleshooting

6.0 Troubleshooting6.0 Troubleshooting

Fault message Possible Cause Corrective action

ONTROL

Display off or no LED lighted  fuse blown

 power switch set to OFF

STOP displayed channel out of service put the channel microswitch 8 to ON INIT displayed  bad detector electrical connections

 defective detector  the type of detector does not

correspond to the configuration of the channel

 channel very badly adjusted

Fault signal lamp lighted and DEF displayed

Fault signal lamp blinking

External alarm controlled in opposite direction, in relation to the tripping of the alarm

channel in maintenance mode for more than 30 minutes

channel in maintenance position

bad choice of relay contact move the jumper to use the correct contact

 check power supply voltages and change the

fuses if necessary

 set the power switch to ON

 check the connections  change the detector  change the type of detector

Caution: The channel could have been damaged

 adjust the channel

reset the channel microswitch 7 to NORMAL

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MX42A C

0 to 100,

0 to 300,

0 to 1000,

0 to 2000;

preset at factory, not field convertible

7.0 Specifications

7.0 Specifications7.0 Specifications

OTE

ONTROL

: All specifications stated in this manual may change without notice.

7.1 Physical

Enclosure Operating temperature Storage temperature Relative humidity Tightness Dimensions Weight Positioning Warranty Function Capacity Measurement Manufacturer

PVC (polyvinyl chloride), completely shielded inside

-10°C to +40°C

-20°C to +55°C 0 to 95%, noncondensing IP54

13.38x11.81x4.22 (340 x 300 x 107 mm, length x height x depth)

10.5 lb (4.75 kg) wall-mounted 1 year Control unit for gas detection 4 channels (2 optional) continuous OLDHAM FRANCE

7.2 Display

Display Measuring scale Signal lamps

Digital LCD

24 LEDs, see details in Section «ALARM»

ENMET Corporation

7.3 Power supply

Electrical supply accessible in enclosure:

 103 V to 122 VAC, 50/60 Hz  207 V to 244 VAC, 50/60 Hz (option) Not field convertible  19 V to 32 V  43 to 60 VAC (option)

Fuses:

 0.63 A, time-delayed, for 230 V and 110 V  4 A for 24 V  2 A, time-delayed, for 48 V

Power consumption: 85 VAC or 67 W On/off switch inside enclosure Earth terminal: yes Cable outlet through 10 metallic cable glands, connected earth ground. Maximum shielded cable diameter: 0.37 in. (10 mm)

7.4 Measurement inputs

Line resistances (loop) in ohms between detector and Control Sensor/transmitter detector of 4-20 mA type, 3 wires or 2 wires: 32 ohms (1 km long, cable 3 x 1.5mm²)

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ENMET Corporation MX42A C

7.5 Alarm

Visual alarms provided: for each channel

• fault signal lamp:

 channel in service: green color  channel off or malfunction of microprocessor: off  disturbance on line: steady yellow color  calibration/adjustment mode: blinking yellow color

• alarm 1 signal lamp: red color when in alarm

• alarm 2 signal lamp: red color when in alarm

• alarm 3 signal lamp: red color when in alarm

Alarms 1 and 2

• activation after 5 seconds

• by increasing or decreasing value

• manual or automatic clearance

Alarm 3

• activation after elapsed delay time or on basis of average value

• automatic clearance

• by increasing or decreasing value

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Disturbance

• complete check of short circuit or cut out of at least one wire (with just one detector)

• display per channel with yellow signal lamp

Buzzer

Triggered if:

 microprocessor malfunction  anomaly of connecting cable or sensor/transmitter  alarm threshold level exceeded  maintenance time longer than 30 minutes

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MX42A C

ONTROL

7.6 Control functions

Accessible after removal of front panel For each channel: A set of 10 microswitches

 Microswitch no. 8: on/off  Microswitch no. 7: maintenance/normal  Microswitch no. 6: “adjustment/calibration”

displays displays alarm settings / loop signal

 Microswitch no. 5: normal/parking garage (alarm 1 and 2) used for European regulations  Microswitch no. 4: increase/decrease (alarm 1)  Microswitch no. 3: “manual/auto” (alarm 1 and 2)

latching / non-latching

 Microswitch no. 2: time delay/average (alarm 3)  Microswitch no. 1: increase/decrease (alarm 2 and 3)  Microswitch no. 9: time delay coding (alarm 3)  Microswitch no. 10:time delay coding (alarm 3)

Potentiometers for the adjustment of zero and sensitivity of detector Programming by pushbutton switches of alarms thresholds, averaging time (alarm 2)

7.7 Relays

Relay contacts

 2 relays per channel for alarm 1 and alarm 2 (positive safety)  1 common relay for alarm 3 (or on option for remote transmission of alarm) (positive safety)  1 common relay for fault (negative safety)  for each relay, choice of common closed contact or common open contact (by positioning jumpers S3 to S12)  characteristics of contact: 2A-250 VAC or 30 V

ENMET Corporation

7.8 Output

 4-20 mA current outputs per channel (common ground)  Load resistance (loop): maximum 600 ohms  In case of fault: output < 1 mA  In maintenance position: output = 2 mA

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ENMET Corporation MX42A C

8.0 WARRANTY

8.0 WARRANTY8.0 WARRANTY

ENMET warrants new instruments to be free from defects in workmanship and material under normal use for a period of one year from date of shipment from ENMET. The warranty covers both parts and labor excluding instrument calibration and expendable parts such as calibration gas, filters, batteries, etc... Equipment believed to be defective should be returned to ENMET within the warranty period (transportation prepaid) for inspection. If the evaluation by ENMET confirms that the product is defective, it will be repaired or replaced at no charge, within the stated limitations, and returned prepaid to any location in the United States by the most economical means, e.g. Surface UPS/FedEx Ground. If an expedient means of transportation is requested during the warranty period, the customer is responsible for the difference between the most economical means and the expedient mode. ENMET shall not be liable for any loss or damage caused by the improper use of the product. The purchaser indemnifies and saves harmless the company with respect to any loss or damages that may arise through the use by the purchaser or others of this equipment.

This warranty is expressly given in lieu of all other warranties, either expressed or implied, including that of merchantability, and all other obligations or liabilities of ENMET which may arise in connection with this equipment. ENMET neither assumes nor authorizes any representative or other person to assume for it any obligation or liability other than that which is set forth herein.

NOTE: When returning an instrument to the factory for service:

 Be sure to include paperwork.  A purchase order, return address and telephone number will assist in the expedient repair and return of your unit.  Include any specific instructions.  For warranty service, include date of purchase  If you require an estimate, please contact ENMET Corporation.

ONTROL

There are Return for Repair Instructions and Form on the last pages of this manual. This Form can be copied or used as needed.

Manual Part Number 80003-042 October 1999 MCN 229, 02/08/00

MCN-286, 11/25/02 MCN-296, 11/12/03 MCN-358, 12/06/06

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PO Box 979 680 Fairfield Court Ann Arbor, Michigan 48106-0979

734.761.1270 Fax 734.761.3220

Returning an Instrument for Repair

ENMET instruments may be returned to the factory or any one of our Field Service Centers for regular repair service or calibration. The ENMET Repair Department and Field Service Centers also perform warranty service work.

When returning an instrument to the factory or service center for service, paperwork must be included which contains the following information:

 A purchase order number or reference number.  A contact name with return address, telephone and fax numbers  Specific instructions regarding desired service or description

of the problems being encountered.

 Date of original purchase and copy of packing slip or invoice

for warranty consideration.

 If a price estimate is required, please note it accordingly and be

sure to include a fax number.

Providing the above information assists in the expedient repair and return of your unit.

Failure to provide this information can result in processing delays.

ENMET charges a one hour minimum billing for all approved repairs with additional time billed to the closest tenth of an hour. All instruments sent to ENMET are subject to a minimum $30 evaluation fee, even if returned unrepaired. Unclaimed instruments that ENMET has received without appropriate paperwork or attempts to advise repair costs that have been unanswered, after a period of 60 days, may be disposed of or returned unrepaired COD with the evaluation fee.

Service centers may have different rates or terms. Be sure to contact them for this information.

Repaired instruments are returned by UPS/FedEx Ground and are not insured unless otherwise specified. If expedited shipping methods or insurance is required, it must be stated in your paperwork.

Note: Warranty of customer installed components.

If a component is purchased and installed in the field, and fails within the warranty term, it can be returned to ENMET and will be replaced, free of charge, per ENMET’s returned goods procedure.

If the entire instrument is returned to ENMET Corporation with the defective item installed, the item will be replaced at no cost, but the instrument will be subject to labor charges at half of the standard rate.

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Repair Return Form

Mailing Address:

ENMET Corporation PO Box 979 Ann Arbor, Michigan 48106

Phone Number: 734.761.1270 FAX Number: 734.761.3220

Your Mailing Address: Your Shipping Address:

Contact Name: __________________________ Your Phone: _______________________ Your PO/Reference Number: _______________ Your FAX: _______________________

Shipping Address:

ENMET Corporation Attn: Repair Department 680 Fairfield Court Ann Arbor, Michigan 48108

Payment Terms: K COD

(Check one) K VISA / MasterCard______________________ ________

Card number Expiration

Return Shipping Method:

K UPS: K Ground K 3 Day Select K Next Day Air K ND Air Saver K 2-Day Air K Federal Express: K Ground K Express Saver K P-1 K Standard K 2-Day Air K FedEx Account number: ________________________

Would you like ENMET to insure the return shipment?

K No K Yes Insurance Amount: $_________________

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