Bacharach MGS-550 Installation Guide

2: SAFETY INSTRUCTIONS

P/N: 1100-0999

Revision 0

June 5, 2015

IP66-Rated ABS Enclosure
with Local

Sensor

CAUTION: DO NOT USE the MGS-550
in oxygen-enriched environments of
>21% oxygen. High “off-scale” read­ings may indicate an explosive con­centraon.

WARNING: Strictly follow the
instrucons in the User Manual
(part number 1100-1000).

Magnec
Wand

Flame

Proof/

Explosion

Proof Ex d

Enclosure

with Local

Sensor

USER MANUAL: Before using this equipment, carefully read
and strictly follow the User Manual (part number
1100-1000). The user must fully understand and strictly
observe the instrucons. Use the equipment only for the
purposes listed and under the condions specified in that
document.

CODE COMPLIANCE: Comply with all local and naonal
laws, rules and regulaons associated with this equipment.

GENUINE PARTS: Use only genuine Bacharach spare parts
and accessories, otherwise proper funconing of the equip­ment may be impaired.

FLAME PROOF AND EXPLOSION PROOF JOINTS: Joints of

the flame proof/explosion proof enclosure are not in accor­dance with the relevant minimum or maximum values of
EN/IEC 60079-1. The joints are not intended to be re-worked
by the user.

EXPLOSIVE DIRECTIVES: As long as no EC-Type Examinaon
Cerficate per Annex II, clauses 1.5.5, 1.5.6 and 1.5.7 of
Direcve 94/9/EC exists: the measuring funcon of the gas
detecon transmier for explosion protecon, according to
Annex II, clauses 1.5.5, 1.5.6 and 1.5.7 of Direcve 94/9/EC
is not covered.

When using the product in areas subject to explosion
hazards, refer to the following:

● Instruments or components for use in explo­sion-hazard areas which have been tested and
approved according to naonal, European or
internaonal Explosion Protecon Regulaons
may only be used under the condions specified
in the approval and with consideraon of the
relevant legal regulaons.

● The instruments or components may not be
modified in any manner. The use of faulty or
incomplete parts is forbidden. The appropriate
regulaons must be observed at all mes when
carrying out repairs on these instruments or

3: MOUNTING

115.0 mm (4.53 in)

Mounng
Point (Ex d)

120.6 mm (4.75 in)

FULL-SIZE

MOUNTING

TEMPLATES --

DO NOT

RESCALE

Mounng
Point (ABS)

Mounng

Point

(Ex d)

144.1 mm (5.67 in)

1: OPERATING AREA AND CONDITIONS

The Bacharach MGS-550 is an instrument for the

connuous monitoring of toxic and combusble gases,
oxygen and refrigerants in ambient air. The instrument
is housed in a rugged ABS or aluminum enclosure for
indoor and outdoor applicaons. The instrument can
be connected to a Bacharach monitoring system or a
Programmable Logic Controller (PLC). With the inte­grated alarm relay configuraon, the instrument can
be operated as a stand-alone unit (with addional
local alarm signaling). The instrument is designed to
be installed in non-classified, non-hazardous, perma­nent locaons.

The instrument is powered by 19.5 to 28.5 VDC or
24 VAC (± 20%). The measured gas concentraon is
converted to a 4 to 20 mA, 0 to 5 V, 0 to 10 V, 1 to 5 V,
2 to 10 V analog and digital Modbus RTU output
signal. The instrument accepts wire sizes of 16 to
24 AWG (0.2 to 1.5 mm

2

).

ENVIRONMENTAL CONSIDERATIONS: Carefully consider the
full range of environmental condions to which the instru­ments will be exposed.

TARGET GAS CONSIDERATIONS: The physical data of the gas
or vapor to be detected must be observed.

APPLICATION CONSIDERATIONS: The specifics of the appli­caon (for example, possible leaks, air movement/dra, etc.)
must be observed.

ACCESSIBILITY CONSIDERATIONS: The degree of accessibili­ty required for maintenance purposes must be granted.

ACCESSORY CONSIDERATIONS: The types of oponal and
accessory equipment that will be used with the system must
be kept in mind.

SENSOR POSITIONING: When installing the instrument or
the remote sensor, the sensor opening should always be
poinng downward.

SUN SHIELD CONSIDERATIONS: If the instrument is exposed
to direct sunlight, the use of a sunshield is recommended.

Mounng

Point (ABS)

4: WEIGHTS AND DIMENSIONS (APPROXIMATE)

WIDTH HEIGHT DEPTH

COMPONENT

General Purpose Enclosure

Explosion Proof Encosure

mm in mm in mm in

210

125

8.3

4.9

225

190

8.9

7.5

85

90

3.4

3.5

WEIGHT

kg

1

1.623.5

lbs

5: WIRING

M20 OPENINGS: The ABS and the

flame proof/explosion proof enclosures
provide four M20 openings for cable
glands or plugs. These openings can be
used for field wiring, direct aachment
of a sensor or wiring of a remote sensor.
Unused openings must be closed with a
suitable plug and gasket, maintaining
the IP or Ex d rang.

NOTE: To make wiring connecons,
you must first open the MGS-550
housing. The enclosure lid of the
IP66 ABS housing has four capve
screws. The enclosure lid of the Ex d
(flame proof/explosion proof) hous­ing unscrews.

Next, carefully discon­nect the combinaon
Display Bezel and
Processor Board (which
remain connected)
from the lower Inter­face Board by unscrew­ing the 3 capve
screws. Access the
capve screws through
holes in the Display
Bezel.

Refer to the User Manual (part number 1100-1000)

for detailed instrucons on accessing the internal
components for wiring.

WARNING: The MGS-550 must be
powered by either (a) a suitable UL
60950/CSA cerfied power supply
that is isolated from line voltage by
double insulaon, or (b) an appro­priately rated UL listed/CSA Class 2
transformer. Failure to comply can
result in personal injury or death.

NOTE: For 24 VDC installaons,
the input is protected. If the
polarity is reversed, the instru­ment will not power-up.

SHIELD WIRE WARNING: Con­nect the shield of the power
wires to the earth ground of the
central control system (e.g.,
chassis, ground bus bar, etc.).

1: Strip 0.2 to 0.25 inches (5 to 7 mm) of wiring
insulaon.

2: Connect the wires as indicated.

FUNCTION PIN LABEL

Power

(+24VDC or 24VAC)

1

2

3

+24VDC/AC

PWR GND

ANALOG 1 GND

Analog Output 1

4

ANALOG OUT 1

24VAC

PWR GND

24VAC

PWR
GND

24VAC

PWR
GND

24VAC

PWR
GND

NOTE: For connecons to an external controller
such as a Bacharach MGS or GDA, refer to the
manual that was included with the controller.

POLARITY WARNING: For 24 VAC installaons
in a daisy-chain configuraon, the neutral polari­ty must be maintained for all instruments.

NOTE: Aer wiring is completed, carefully re-as­semble the enclosure and its components, nong
the keyed ribbon cable and sensor connectors.
Aer installaon is complete, be sure to refer to
the User Manual

detailed instrucons on registering the sensors and
configuring the MGS-550 for proper operaon.

(part number 1100-1000) for

24VAC

PWR
GND

24VAC

PWR
GND

4-Wire Power and Output to
Central Control System

3-Wire Power and Output to
Central Control System

24VAC

PWR GND

A OUT 1

A1 GND

PWR GND

+24VDC

SUPPLY

TRANSFORMER

mA

-

+

AC

POWER

Processor

Board
(Middle Layer)
with Keyed
Ribbon Cable

Internal
Display Bezel
(Top Layer)

5

ANALOG 2 GND

Analog Output 2

Modbus RTU

6

7

8

9

ANALOG OUT 2

RS-485 GND

A

B

FUNCTION PIN LABEL

RELAY 1 NC

RELAY 1 C

RELAY 1 NO

RELAY 2 NC

RELAY 2 C

RELAY 2 NO

RELAY 3 NC

RELAY 3 C

RELAY 3 NO

Relay 1 Output

Relay 2 Output

Relay 3 Output

10

11

12

13

14

15

16

17

18

PIN 10

PIN 18

Connector Style

May Vary Slightly

from Photo

PIN 9

Interface Board

(Boom Layer)

PIN 1

A OUT 1

mA

PWR GND

+24VDC

World Headquarters

621 Hunt Valley Circle

New Kensington, PA 15068 USA

Phone: [phone] • Fax: [phone]

Toll Free: 1-800-736-4666

Website: www.MyBacharach.com

E-mail: [e-mail]

114A Georges Street Lower

Dun Laoghaire • Co Dublin • Ireland

Phone: [phone] • Fax: [phone]

-

+