Bacharach MGS-400 User manual

1100-2294 Rev 0 1

1100-2294 Rev 0 1
WARRANTY POLICY
Bacharach, Inc. warrants to buyer that at the time of delivery this product will be free from
defects in material and manufacture and will conform substantially to Bacharach, Inc.’s
applicable specifications. Bacharach’s liability and buyer’s remedy under this warranty are
limited to the repair or replacement, at Bacharach’s option, of this product or parts thereof
returned to seller at the factory of manufacture and shown to Bacharach, Inc.’s reasonable
satisfaction to have been defective; provided that written notice of the defect shall have been
given by buyer to Bacharach, Inc. within one (1) year after the date of delivery of this product by
Bacharach, Inc.
Bacharach, Inc. warrants to buyer that it will convey good title to this product. Bacharach’s
liability and buyer’s remedy under this warranty of title are limited to the removal of any title
defects or, at the election of Bacharach, to the replacement of this product or parts thereof that
are defective in title.
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN
LIEU OF (I) ANY AND ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE: AND (II) ANY OBLIGATION, LIABILITY, RIGHT, CLAIM OR
REMEDY IN CONTRACT OR TORT, WHETHER OR NOT ARISING FROM BACHARACH’S
NEGLIGENCE, ACTUAL OR IMPLIED. The remedies of the buyer shall be limited to those
provided herein to the exclusion of any and all other remedies including, without limitation
incidental or consequential damages. No agreement varying or extending the foregoing
warranties, remedies or this limitation will be binding upon Bacharach, Inc. unless in writing,
signed by a duly authorized officer of Bacharach.
Register Your Warranty by Visiting: www.mybacharach.com
SERVICE POLICY
Bacharach, Inc. maintains a service facility at the factory. Some Bacharach distributors / agents
may also have repair facilities; however, Bacharach assumes no liability for service performed
by anyone other than Bacharach personnel. Repairs are warranted for 90-days after date of
shipment (sensors, pumps, filters and batteries have individual warranties). Should your
analyzer require non-warranty repair, you may contact the distributor from whom it was
purchased or you may contact Bacharach directly.
If Bacharach is to do the repair work, send the monitor, prepaid, to the closest service center.
Prior to shipping equipment to Bacharach, visit www.mybacharach.com for a Returned
Merchandise Authorization Number (RMA #). All returned goods must be accompanied by a
RMA #. Pack the equipment securely (in its original packing, if possible), as Bacharach cannot
be held responsible for any damage incurred during shipping to our facility. Always include your
RMA #, shipping address, telephone number, contact name, billing information and a
description of the defect as you perceive it. You will be contacted with a cost estimate for

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expected repairs prior to the performance of any service work. For liability reasons, Bacharach
has a policy of performing all needed repairs to restore the monitor to full operating condition.
NOTICES
Product improvements and enhancements are on-going, therefore the specifications and
information contained in this document may change without notice.
Bacharach, Inc. shall not be liable for errors contained herein or for incidental or consequential
damages in connection with the furnishing, performance, or use of this material.
No part of this document may be photocopied, reproduced, or translated to another language
without the prior written consent of Bacharach, Inc.
Copyright © 2019, Bacharach, Inc., All Rights Reserved.
BACHARACH is a registered trademark of Bacharach, Inc. All other trademarks, trade names, service marks and logos referenced
herein belong to their respective companies.

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Table of Contents
Table of Contents 3
Service Center Locations Error! Bookmark not defined.
1. Introduction 7
1.1 About this Manual 7
1.2 Conventions 7
1.2.1 Short Form Instructions 7
1.2.2 Iconography 8
1.3 General Safety Statements 8
1.4 Safe Connection of Electrical Devices 9
2. Product Descriptions 10
2.1 Intended Uses / Applications 10
2.2 MGS-410 10
2.2.1 MGS-410 Product Overview 10
2.2.2 MGS-410 Design Features 11
2.2.3 MGS-410 Components 12
2.3 MGS-450 13
2.3.1 MGS-450 Product Overview 13
2.3.2 MGS-450 Design Features 14
2.3.3 MGS-450 Components 15
2.4 MGS-460 17
2.4.1 MGS-460 Product Overview 17
2.4.3 MGS-460 Components 18
3. Installation 21
3.1 General Information 21
3.2 Restrictions 22
3.3 Mechanical Installation 22
3.4 Electrical Installation 22
3.4.1 Preparations 22
3.4.2 Power & Signal Wiring 23
3.4.3 Relay Wiring 24
3.4.4 Installation of Remote Sensing Head (MGS-460) 24

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3.4.5 Connecting to MGS-408 Gas Detection Controller 25
3.4.6 Modbus RTU RS-485 Interface 25
3.4.7 Conclusion 26
4. Operation 27
4.1 Overview of Normal Operation 27
4.1.1 Applying Power & the Start-up Sequence 27
4.1.2 Verifying Analog Signals 28
4.1.3 Verifying the Modbus Signal 29
4.1.4 Status Indication 29
4.1.5 Switch Functions 30
4.1.6 Reset System to Factory Default Settings 31
4.2 MGS-400 Smartphone Application 31
4.2.1 Enable Bluetooth®Connection 32
4.2.2 Checking Status 32
4.2.3 Instrument Configuration 34
4.2.3.1 Change Alias 34
4.2.3.2 Change Unlock Code 34
4.2.3.3 Change Bluetooth Passcode 35
4.2.3.4 Reset to factory defaults 35
4.2.3.5 Alarm Configuration 35
Low Alarm Setpoint 35
High alarm Setpoint 36
Alarm Latching 36
4.2.3.6 Modbus Configuration 37
Address 37
Baud Rate 37
Stop Bits 37
Parity 37
Enable 120Ω Termination 38
4.2.3.7 Output Configuration 38
Analog Output Range 38
Buzzer 39
Relay Failsafe 39

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Alarm Delay 39
Analog Zero Adjust 39
Analog Span Range 40
5. Care & Maintenance 41
5.1 Maintenance Intervals 41
5.2 Adjustments 42
5.2.1 Introduction 42
5.2.2 General Calibration Procedure 43
5.2.3 Zero Adjustment 43
5.2.4 Span Adjustment 45
5.2.5 System Bump Test 46
5.3 Troubleshooting 47
5.3.1 Hexadecimal Format 47
5.3.3 Fault Codes 47
5.4 Sensor Maintenance 49
5.4.1 Components Overview 49
5.4.2 Replacing the Sensor Module 51
5.5 Cleaning the Instrument 51
6. Additional Information 52
6.1 Sensor Principle 52
6.1.1 Electrochemical Sensors 52
6.1.2 Catalytic Bead Sensors 52
6.1.3 Semiconductor Sensors 53
6.1.4 Infrared Sensors 54
6.2 Disposing of the Instrument 54
6.2.1 Disposing of the Electrical & Electronic Equipment 54
6.2.2 Disposing of Sensors 54
6.3 Technical Specifications 55
6.3.1 General Specifications 55
6.3.2 Sensor Specifications 57
6.4 Modbus Registers 58
6.4.1 Integration - Dynamic Sensor Data 58
6.4.2 Integration - Static Sensor Data 59

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6.4.3 Integration - General System Setup 61
6.4.4 Integration - Calibration 63
6.4.5 Integration - User Debug Tools 63
6.4.6 MGS Compatibility - Status Flags 64
6.4.7 Integration - Status Flags 64
6.4.8 MGS Compatibility - Clear Special States 64
6.4.9 Integration - User Tasks 65
7. Ordering Information 66
7.1 Part Numbers 66
7.1.1 MGS-410 Configurations 66
7.1.2 MGS-450 Configurations 69
7.1.3 MGS-460 Configurations 75
7.1.4 MGS-400 Series Accessories 78
7.1.5 MGS-400 Pre-calibrated Sensor Modules 78
7.2 Service Center Locations 80

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1. Introduction
1.1 About this Manual
Thank you for investing in a Bacharach MGS-400 Gas Detector. To ensure operator safety and
the proper use of the gas detector, please read the contents of this manual for important
information on the operation and maintenance of the instrument.
IMPORTANT: Before installing this product, carefully read and strictly follow the
instructions in the manual.
1.2 Conventions
1.2.1 Short Form Instructions
This document uses a short form for describing steps (e.g. executing a command).
Example:
Accessing sensor calibration.
Short Form Instructions:
To select access sensor calibration: Home Tab Calibrate enter Unlock Code
Steps Required:
1. Open the Home Tab.
2. Select Calibrate.
3. When prompted, enter the Unlock Code to access calibration screen.

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1.2.2 Iconography
Alert
Icon
Description
Danger
Imminently hazardous situation which, if not avoided, will
result in death or serious injury.
Warning
Potentially hazardous situation which, if not avoided, could
result in death or serious injury.
Warning
Potential electrical shock hazard which, if not avoided, could
result in death or serious injury.
Caution
Potentially hazardous situation which, if not avoided, could
result in physical injury or damage to the product or
environment. It may also be used to alert against unsafe
practices.
Important
Additional information on how to use the product.
1.3 General Safety Statements
IMPORTANT: Before using this product, carefully read and strictly follow the
instructions in the manual. Ensure that all product documentation is retained and
available to anyone operating the instrument.
DANGER: This instrument is neither certified nor approved for operation in
oxygen-enriched atmospheres. Failure to comply may result in personal
injury or death.
WARNING: Use this product only for the purposes specified in this document and
under the conditions listed.
WARNING: This instrument has not been designed to be intrinsically safe for use
in areas classified as being hazardous locations. For your safety, DO NOT use it in
hazardous (classified) locations.
WARNING: In the event of an alarm or over-range condition, the sensor must be
recalibrated to ensure continued accuracy.

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WARNING: This product must be recalibrated if installed in a non-room condition
environment (i.e. temperature or humidity extremes).
WARNING: The gas diffusion path can become occluded (moisture, dust, debris,
frozen condensation) over time resulting in reduced or complete lack of gas
detection and alarming function. Routine visual inspection of the gas detector and
bump testing are suggested to ensure proper gas detection and alarm function.
CAUTION: Except for maintenance detailed in this manual, these products should
only be opened and / or serviced by authorized Bacharach personnel. Failure to
comply may void the warrant.
CAUTION: Operator assumes responsibility for complying with all laws, rules and
regulations governing the use of this product.
CAUTION: Use only genuine Bacharach parts and accessories. Failure to comply
may impair the operation of the product and / or void the warranty.
CAUTION: Only operate the product within the framework of a risk-based alarm
signaling concept.
1.4 Safe Connection of Electrical Devices
WARNING: Before connecting this instrument to electrical devices not mentioned
in this manual, consult the manufacturer or a qualified professional. Failure to
comply may result in injury and / or damage to the product.

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2. Product Descriptions
2.1 Intended Uses / Applications
Bacharach MGS 400 Gas Detection Series instruments continuously monitor ambient air (indoor
or outdoor) for the following gas types:
• Refrigerants
• Oxygen
• Toxic and combustible gases
The instruments may be purchased in the following configurations:
• MGS-410 - IP66
• MGS-450 - IP41
• MGS-450 - IP66
• MGS-460 - IP66 with Remote IP66 Sensor
MGS-400 gas detectors may be connected to a Bacharach’s MGS-408 Gas Detection Controller
or a third-party device capable of accepting digital and/or analog outputs from the gas detectors,
such as a Building Management System (BMS) or Programmable Logic Controller (PLC). With
the integrated audio-visual alarm indication, an instrument can be operated as a stand-alone
unit (with additional local alarm signaling as required).
WARNING: This instrument is neither certified nor approved for operation in
oxygen-enriched atmospheres. Failure to comply may result in EXPLOSION.
WARNING: This instrument has not been designed to be intrinsically safe for use
in areas classified as being hazardous locations. For your safety, DO NOT use it
in hazardous (classified) locations.
2.2 MGS-410
2.2.1 MGS-410 Product Overview
The Bacharach MGS-410 continuously monitors indoor or outdoor ambient air for the following
gases: refrigerants, oxygen, toxic and combustible gases.
The instrument may be purchased in the following configuration: IP66.

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With the integrated Modbus communication, the instrument can be operated as a stand-alone unit
or integrated with Bacharach’s MGS-408 8 Channel Modbus Controller. Or a third-party device
capable of accepting digital outputs from the gas detectors, such as a Building Management
System (BMS) or a Programmable Logic Controller (PLC). The instrument is designed to be
installed in non-classified, non-hazardous, permanent locations.
2.2.2 MGS-410 Design Features
Transmitter construction:
IP66 rated ABS enclosure
Power options
24 VAC
19.5 to 28.5 VDC
Diagnostic/status LED (3 color: green, orange and red)
Digital output Modbus RTU signal
Bluetooth communication allows for full instrument configuration, initiation of calibration,
bump test and functional test mode, and viewing of status information via the corresponding
Bacharach iOS / Android app.
Pre-calibrated sensor exchange modules can be used for maintenance of the instrument
instead of performing gas calibration on site.
Non-intrusive magnetic wand can be used to initiate calibration of the device.

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2.2.3 MGS-410 Components
This product uses semiconductors which can be damaged by electrostatic discharge (ESD).
When handling the PCB, care must be taken so that the electronics are not damaged.
#
Component Description
1
M16 Cable Glands (×4)
2
Rubber Gasket
3
Digital Connection / Modbus (In)
4
Digital Connection / Modbus (Out)
5
Tactile Switch #1
6
Tactile Switch #2
7
Ribbon Cable Connection (To Sensor)
8
Power Connection (In)

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9
Internal Alarm Buzzer
10
Power Connection (Out)
11
Magnetic Switch #1
12
Magnetic Switch #2
2.3 MGS-450
2.3.1 MGS-450 Product Overview
The Bacharach MGS-450 continuously monitors indoor or outdoor ambient air for the following
gases:
refrigerants
oxygen
toxic and combustible gases.
The instrument may be purchased in one of two configurations:
MGS-450 - IP41
MGS-450 - IP66
With the integrated Modbus communication, analog output and relays, the instrument can be
operated as a stand-alone unit or integrated with Bacharach’s MGS-408 8 Channel Modbus
Controller. or a third-party device capable of accepting digital and/or analog outputs from the gas
detectors, such as a Building Management System (BMS) or a Programmable Logic Controller
(PLC). The instrument is designed to be installed in non-classified, non-hazardous, permanent
locations.

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2.3.2 MGS-450 Design Features
Transmitter options:
IP41 or IP66 rated ABS enclosure
Power options
24 VAC
19.5 to 28.5 VDC
Diagnostic/status LED (3 color: green, orange and red)
Configurable output signal options
3×Relays (high alarm / low alarm / fault)
1× Analog Output (4 to 20 mA, 0 to 5 V, 0 to 10 V, 1 to 5 V, 2 to 10 V)
Digital Output (Modbus RTU signal)
Bluetooth communication allows for full instrument configuration, initiation of calibration,
bump test and functional test mode, and viewing of status information via the corresponding
Bacharach iOS / Android app.
Pre-calibrated sensor exchange modules can be used for maintenance of the instrument
instead of performing gas calibration on site.

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Non-intrusive magnetic wand can be used to initiate calibration of the device.
2.3.3 MGS-450 Components
This product uses semiconductors which can be damaged by electrostatic discharge (ESD).
When handling the PCB, care must be taken so that the electronics are not damaged.

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#
Component Description
1
M16 Cable Glands (×6)
2
Rubber Gasket (IP66 Version Only)
3
Internal Alarm Buzzer
4
Power Connections (×2)
5
Digital Connection (Modbus)
6
Analog Connection
7
Tactile Switch #1
8
Ribbon Cable Connection (To Sensor)
9
Tactile Switch #2
10
Relay 3 Connection (FAULT)
11
Relay 2 Connection (HIGH)
12
Relay 1 Connection (LOW)
13
Magnetic Switch #1
14
Magnetic Switch #2
15
M20 Cable Glands (×2)

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2.4 MGS-460
2.4.1 MGS-460 Product Overview
The Bacharach MGS-450 continuously monitors indoor or outdoor ambient air for the following
gases:
refrigerants
oxygen
toxic and combustible gases.
The instrument may be purchased in the following configuration:
IP66 with Remote IP66 Sensor, connected via RJ45 cable (up to 20 meters in
length)
With the integrated Modbus communication, analog output and relays, the instrument can be
operated as a stand-alone unit or integrated with Bacharach’s MGS-408 8 Channel Modbus
Controller. or a third-party device capable of accepting digital and/or analog outputs from the gas
detectors, such as a Building Management System (BMS) or a Programmable Logic Controller
(PLC). The instrument is designed to be installed in non-classified, non-hazardous, permanent
locations.

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2.4.2 MGS-460 Design Features
Transmitter options:
2× IP66 rated ABS enclosure connected via RJ45 cable (up to 5 meters in length)
Power options
24 VAC
19.5 to 28.5 VDC
Diagnostic/status LED (3 color: green, orange and red)
Configurable output signal options
3 x relays (high alarm / low alarm / fault)
1× Analog Output (4 to 20 mA, 0 to 5 V, 0 to 10 V, 1 to 5 V, 2 to 10 V)
Digital output Modbus RTU signal
Bluetooth communication allows for full instrument configuration, initiation of calibration,
bump test and functional test mode, and viewing of status information via the corresponding
Bacharach iOS / Android app.
Pre-calibrated sensor exchange modules can be used for maintenance of the instrument
instead of performing gas calibration on site.
Non-intrusive magnetic wand can be used to initiate calibration of the device.
2.4.3 MGS-460 Components
This product uses semiconductors which can be damaged by electrostatic discharge (ESD).
When handling the PCB, care must be taken so that the electronics are not damaged.

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#
Component Description
1
M16 Cable Glands (×6)
2
Rubber Gaskets (×2)
3
Internal Alarm Buzzer
4
Power Connections (×2)
5
Digital Connection (Modbus)
6
Analog Connection
7
Tactile Switch #1