background image

STEP 4 | 

Reconnect Lid

Internal Connections

Front Panel

Sensor

Connector J2

Sensor

Connector J3

Microprocessor Board 

Connector J1

Buzzer

Pin 9

Pin 1

Pin 18

Power and Signal Wiring 

(Terminal Block 1)

Pin 10

Relay Wiring

(Terminal Block T2)

Fixed Gas Detection

P/N: 1100-0618

 | April 2021 Revision 0

Quick Start 

Guide

Dual Sensor Gas Detector

for Refrigerant, Toxic & Combustible Gas Detection

4.  Installation

USA Customer Service: 

+1 724 334 5000

CAN Customer Service: 

+1 905 882 8985

EU Customer Service: 

+353 1 284 6388

website: 

mybacharach.com

 

|

 email: 

help@mybacharach.com

Copyright © 2021 Bacharach, Inc. All Rights Reserved

2.  Safety Instructions 

(Continued)

DANGER:

 The MGS-550 is NOT

 certified or approved for operation 

in  oxygen-enriched  atmospheres.  Failure  to  comply  may  result  in 

severe injury or death.

WARNING:

 Use this product 

ONLY

 for the purposes and under 

the conditions listed in MGS-550 User Manual. Failure to comply 

may result in injury and / or damage to the product.

WARNING:

 The MGS-550 has not been designed to be intrinsically 

safe for use in areas classified as being hazardous locations. For your 

safety, 

DO NOT

 use in hazardous locations.

WARNING:

  Consult  a  qualified  professional  before  connecting 

the  MGS-550  to  devices  not  mentioned  in  this  manual.  Failure 

to comply may result in injury and / or damage to the product.

CAUTION:

 Except for the maintenance detailed in this manual, this 

product should 

ONLY

 be opened and / or serviced by authorized 

personnel. Failure to comply may void the warranty.

1.  Introduction

The MGS-550 gas detector is designed for use in refrigeration 

applications and may be used as a standalone device, connected 

to the MGS-402 or MGS-408 controllers, or connected to a facility’s 

BMS / BAS. It enables compliance with refrigeration safety codes 

(ASHRAE 15, EN 378, CSA-B52)

 and features audible and visual 

alarms to alert personnel in the event of a leak.

2.  Safety Instructions

IMPORTANT: 

The MGS-550 must be installed by a suitably qualified 

technician  who  will  install  this  unit  in  accordance  with  these 

instructions and the standards in their particular industry / country. 

This  document  is  only  intended  as  a  guide  and  the  manufacturer 

bears no responsibility for the installation or operation of this unit.

#

Front Panel Component Description

1

Controller Power LED

2

Concentration LEDs (PPM, %LEL, %Vol - both off)

3

5-digit, 7-segment display (Gas, real-time concentration)

4

Magnetic Switches (dashed line around icon)

5

Tactile Switches (solid line around icon)

6

Local gas sensor element (remote sensor elements available)

STEP 2 | 

Wire Connections

WARNING:

 Ensure that all wiring connections are made BEFORE

 

applying power.

WARNING

POLARITY:  For  24  VAC  installations  in  a  daisy-chain 

configuration, the neutral polarity must be maintained for all instruments. 

IMPORTANT: 

T

he MGS-550 must be powered by either (a) a suitable 

UL 60950 / CSA certified power supply that is isolated from line voltage 

by double insulation, or (b) an appropriately rated UL listed / CSA Class 

2 transformer.

IMPORTANT

Refer to MGS-550 User Manual for instructions for 

connecting to the MGS-402 or MGS-408 controller.

1.  Strip 0.2 to 0.25 inches

 (5 to 7 mm)

 of wiring insulation.

2.  Unscrew the appropriate cable gland and gasket.
3.  Connect  the  wires  as  indicated  in  the  Internal  Connections 

in Section 3. Component Overview. 

(Refer to the MGS-550 User 

Manual for complete wiring details.)

4.  Connect the shield of the power wires to the earth ground of 

the central control system.

5.  Screw the gland gasket onto the housing and tighten.

IMPORTANT: 

Comply  with  all  local  and  national  laws,  rules  and 

regulations associated with this equipment. Operators should be 

aware of the regulations and standards in their industry / locality 

for the operation of the MGS-550.

IMPORTANT:

  The  MGS-550  will  come  with  one  or  no  sensors 

installed from the factory.

IMPORTANT:

 The gas detector may have come with one factory 

installed gas sensor element. A second gas sensor element may 

be installed 

(if applicable)

 in the second M25 Cable gland at the 

bottom of the gas detector.

IMPORTANT:

  Any  newly  installed  sensor(s)  will  need  to  be 

registered with the gas detector.

1.  Remove the factory installed cable gland and gasket.
2.  Route  the  sensor  lead  into  the  cable  gland  with  gasket 

installed and tighten sensor into the gas detector housing.

3.  Plug the sensor lead into either sensor connector J2 or J3 

(see component overview, Internal Wiring Description)

 routing 

the sensor as shown in the diagram below.  If both sensors 

are to be installed (none installed from the factory) follow 

the above instructions for each sensor to be installed.

STEP 1 | 

Mount Gas Detector & Remove Lid

WARNING:

 DO NOT 

allow the lid/sensor to hang from the ribbon 

cable. Failure to comply may result in damage to the product.

1.  Mount the  MGS-550 according  to  the  product  dimensions, 

maximum wiring lengths and following considerations:

• 

Environment:

 the full range of environmental conditions 

when selecting a location.

• 

Application:

 the specifics of the application 

(possible leaks, air 

movement / draft, etc.),

 when selecting a location.

• 

Accessibility

: the degree of accessibility required for 

maintenance purposes when selecting a location.

• 

Target  Gas:

  the  specific  gravity  of  the  target  gas  when 

selecting the height of the instrument.

2.  Using a 5/32″ 

(4 mm)

 hex key / Allen wrench 

(not included)

 remove 

the lid and disconnect the ribbon cable from the base.

3.  Set the lid and rubber gasket aside to be reinstalled later

IMPORTANT:

  The  manufacturer  of  this  product  recommends 

that  a  bump  test  be  performed  following  installation  to  verify 

instrument functionality.

WARNING:

 DO NOT

 leave excess cable inside of the gas detector 

housing. Failure to comply may result in damage to the product.

CAUTION: 

When  installing  the  sensor  ribbon  cable,  care  must 

be  taken  to  ensure  the  proper  orientation  of  the  connector  at 

both ends of the cable. Failure to ensure proper orientation may 

result in loss of functionality and / or product damage.

IMPORTANT:

  To  achieve  proper  seal,  the  lid  screws  should  be 

torqued to 15 to 20 lb

f

 in (1.5 to 2.0 Nm).

1.  Ensure that all excess wire is minimized in the enclosure so 

it doesn’t interfere with internal components.

2.  Reinstall  the  rubber  gasket.  Ensure  that  it  is  correctly 

seated by placing the side with two grooves face down and 

the edge with two bumps on the top.

4.  Installation 

(Continued)

STEP 3 | 

Installing One or Two Sensors

3.  Component Overview

Summary of Contents for MGS 550

Page 1: ...Fixed Gas Detection P N 1100 0618 April 2021 Revision 0 Quick Start Guide Dual Sensor Gas Detector for Refrigerant Toxic Combustible Gas Detection ...

Page 2: ... professional before connecting the MGS 550 to devices not mentioned in this manual Failure to comply may result in injury and or damage to the product CAUTION Except for the maintenance detailed in this manual this product should ONLY be opened and or serviced by authorized personnel Failure to comply may void the warranty 1 Introduction The MGS 550 gas detector is designed for use in refrigerati...

Page 3: ...in their particular industry country This document is only intended as a guide and the manufacturer bears no responsibility for the installation or operation of this unit IMPORTANT Comply with all local and national laws rules and regulations associated with this equipment Operators should be aware of the regulations and standards in their industry locality for the operation of the MGS 550 ...

Page 4: ...Block 1 Pin 10 Relay Wiring Terminal Block T2 Front Panel Component Description 1 Controller Power LED 2 Concentration LEDs PPM LEL Vol both off 3 5 digit 7 segment display Gas real time concentration 4 Magnetic Switches dashed line around icon 5 Tactile Switches solid line around icon 6 Local gas sensor element remote sensor elements available 3 Component Overview ...

Page 5: ...he application possible leaks air movement draft etc when selecting a location Accessibility the degree of accessibility required for maintenance purposes when selecting a location Target Gas the specific gravity of the target gas when selecting the height of the instrument 2 Using a 5 32 4 mm hex key Allen wrench not included remove the lid and disconnect the ribbon cable from the base 3 Set the ...

Page 6: ...n or b an appropriately rated UL listed CSA Class 2 transformer IMPORTANT Refer to MGS 550 User Manual for instructions for connecting to the MGS 402 or MGS 408 controller 1 Strip 0 2 to 0 25 inches 5 to 7 mm of wiring insulation 2 Unscrew the appropriate cable gland and gasket 3 Connect the wires as indicated in the Internal Connections in Section 3 Component Overview Refer to the MGS 550 User Ma...

Page 7: ...gram below If both sensors are to be installed none installed from the factory follow the above instructions for each sensor to be installed WARNING DO NOT leave excess cable inside of the gas detector housing Failure to comply may result in damage to the product CAUTION When installing the sensor ribbon cable care must be taken to ensure the proper orientation of the connector at both ends of the...

Page 8: ...ontinued 1 Carefully reattach the ribbon cable to J1 as shown in Internal Wiring Description in Section 2 carefully noting the keyed position on the connector 2 Using a 5 32 4 mm hex key allen wrench tighten the lid screws in an X tightening pattern ...

Page 9: ... registered with the gas detector 1 Power up the gas detector The detector will prompt you to start the registration e g rEg 2 2 Acknowledge by tapping The detector will indicate a successful registration e g PASS2 if the sensor was correctly installed STEP 5 Register the New Sensor ...

Page 10: ...d or Sensor 2 Flashing Red 0 5 Hz Display will toggle between ALARM gas name concentration of each sensor until concentration falls below low alarm level Alarm State Normal Normal PULSE 0 5 Hz High Alarm Sensor 1 and or Sensor 2 Flashing Red 2 Hz Display will toggle between ALARM gas name concentration of each sensor until alarm is acknowledged and concentration falls below High alarm level Alarm ...

Page 11: ...or CO2 or O2 sensors ambient air may be used instead of zero gas if the area is know to be free of the target gas or any gases to which the sensor may be cross sensitive 5 Enter the menu and select function F 02 Zero Sensor Press the UP DOWN arrows to select the sensor to be calibrated then press 6 Apply Synthetic air i e 20 9 zero air or nitrogen and then press The current value will be blinking ...

Page 12: ...should be displayed the instrument status should be Low Alarm or High Alarm and alarms states should be On 5 Turn off gas flow and remove the calibration adapter 6 Allow sensor to recover stabilize before the instrument returns to normal operation green LED PN 1100 XXXX SN YYMM GAS CO2 10000 PPM Part Number Serial Number Sensor Type Max Range 6c Span Adjustment 13 Press the UP DOWN arrows to chang...

Page 13: ...A Customer Service 1 724 334 5000 CAN Customer Service 1 905 882 8985 EU Customer Service 353 1 284 6388 website mybacharach com email help mybacharach com Copyright 2021 Bacharach Inc All Rights Reserved ...

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