Bacharach MGS-550 User guide

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Operating Manual

MGS-550

Fixed Gas Detector

Order No.: H1100-1000/01

Print Spec: 10000005389 (R)

CR: 800000058146

MSAsafety.com

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WARNING!

These instructions must be provided to users before use of the product and retained for ready reference by the user. Read this manual carefully before using or maintaining the device. The device will perform as designed only if it is used and maintained in accordance with the manufacturer's instructions. Otherwise, it could fail to perform as designed, and persons who rely on this device could sustain serious injury or death.

The warranties made by MSA with respect to the product are voided if the product is not installed and used in accordance with the instructions in this manual. Please protect yourself and your employees by following the instructions.

Please read and observe the WARNINGS and CAUTIONS inside. For additional information relative to use or repair, call 1-800-MSA-2222 during regular working hours.

For countries of Russian Federation, Republic of Kazakhstan and Republic of Belarus, the gas detector will be delivered with a passport document that includes valid approval information. On the CD with manual instruction attached to the gas detector the user will find the documents "Type Description" and "Test Method" - appendixes to Pattern Approval Certificate of Measuring instrument, valid in the countries of use.

MSA is a registered trademark of MSA Technology, LLC in the US, Europe and other Countries. For all other trademarks visit https://us.msasafety.com/Trademarks.

1000 Cranberry Woods Drive Cranberry Township, PA 16066 USA Phone: 1-800-MSA-2222 Fax: 1-800-967-0398

For your local MSA contacts, please go to our website www.MSAsafety.com

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WARRANTY POLICY

MSA Bacharach warrants this instrument, excluding sensors, to be free from defects in materials and workmanship for a period of two years from the date of purchase by the original owner. The sensors have a pro-rated warranty period of 6 to 18 months, depending on the sensor type. If the product should become defective within this warranty period, we will repair or replace it at our discretion.

The warranty status may be affected if the instrument has not been used and maintained per the instructions in this manual or has been abused, damaged, or modified in any way. This instrument is only to be used for purposes stated herein. The manufacturer is not liable for auxiliary interfaced equipment or consequential damage.

Due to ongoing research, development, and product testing, the manufacturer reserves the right to change specifications without notice. The information contained herein is based on data considered accurate. However, no warranty is expressed or implied regarding the accuracy of this data.

All goods must be shipped to the manufacturer by prepaid freight. All returned goods must be pre-authorized by obtaining a return merchandise authorization (RMA) number. Contact the manufacturer for a number and procedures required for product transport.

SERVICE POLICY

MSA Bacharach maintains an instrument service facility at the factory. Some MSA Bacharach distributors/agents may also have repair facilities; however, MSA Bacharach assumes no liability for service performed by anyone other than MSA Bacharach personnel. Repairs are warranted for 90 days after date of shipment (sensors, pumps, filters and batteries have individual warranties). Should your instrument require non-warranty repair, you may contact the distributor from whom it was purchased or you may contact MSA Bacharach directly.

If MSA Bacharach is to do the repair work, send the instrument, prepaid, to the closest Service Center.

Service Location Service Contact Information Service Shipping Address

United States

Canada

http://mybacharach.com/rmaform/ Phone: +1 724 334 5000 Toll Free: 1 800 736 4666 Fax: +1 724 334 5001 Email: help@MyBacharach.com

Phone: (780) 483-0988 Email: support@BachCan.ca

MSABacharach 621 Hunt Valley Circle New Kensington, PA 15068, USA ATTN: Service Department

MSAEdmonton Repair Service 12130 – 154th Street Edmonton, Alberta T5V 1J2

Always include your RMA #, address, telephone number, contact name, shipping/billing information and a description of the defect as you perceive it. You will be contacted with a cost estimate for expected repairs prior to the performance of any service work. For liability reasons, MSA Bacharach has a policy of performing all needed repairs to restore the instrument to full operating condition.

Prior to shipping equipment to MSA Bacharach, contact our office for an RMA # (returned merchandise authorization). All returned goods must be accompanied with an RMA number.

Pack the equipment well (in its original packing if possible), as MSA Bacharach cannot be held responsible for any damage incurred during shipping to our facility.

NOTICES

This manual is subject to copyright protection; all rights are reserved under international and domestic copyright laws. This manual may not be copied or translated, in whole or in part, in any manner or format, without the written permission of MSA Bacharach, Inc.

All software utilized and/or distributed by MSA Bacharach is subject to copyright protection. All rights are reserved. No party may use or copy such software in any manner or format, except to the extent that MSA Bacharach grants them a license to do so. If this software is being loaded onto more than one computer, extra software licenses must be purchased.

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Contents

1 Safety 5

1.1 General Safety Statements 5

1.2 Safe Connection of Electrical Devices 5

2 Description 5

2.1 Product Overview 5

2.2 Key Product Features 6

2.3 General Overview 7

2.4 Sensor Styles 8

3 Installation 8

3.1 General Information for Installation 8

3.2 Installation Restrictions 9

3.3 Mechanical Installation 9

3.4 Electrical Installation 9

4 Operation 15

4.1 Overview of Normal Operation 15

4.2 Menus 19

4.3 Functions 22

4.4 Parameters 25

5 Maintenance 31

5.1 Maintenance Intervals 31

5.2 Making Adjustments to Sensors 31

5.3 Troubleshooting 34

5.4 Sensor Maintenance 39

5.5 Replacing the Instrument Electronics 44

5.6 Replacing the Interface Board 45

5.7 Cleaning the Instrument 45

6 Factory Default Settings 46

7 Sensor Principle 47

7.1 Electrochemical Sensors 47

7.2 Catalytic Bead Sensors 47

7.3 Semiconductor Sensors 48

7.4 Infrared Sensors 48

8 Disposing of the Instrument 48

8.1 Disposing of Electrical and Electronic Equipment 48

8.2 Disposing of Electrochemical Sensors 49

9 Technical Data 49

9.1 General Specifications 49

9.2 Sensor Specifications 50

9.3 Modbus Registers 51

10 Ordering Information 57

10.1 MGS-550 Instrument Only 57

10.2 MGS-550 Gas Detector, IP66 with IP66 Sensor 57

10.3 MGS-550 5m Remote and Second Sensing Heads 59

10.4 MGS-550 Replacement Parts and Accessories 60

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1 Safety

1.1 General Safety Statements

WARNING!

Before using this product, carefully read and strictly follow the instructions in the manual.

Use the product only for the purposes specified in this document and under the conditions listed.

Ensure that product documentation is retained, made available, and appropriately used by anyone operating the product.

Comply with all local and national laws, rules, and regulations associated with this product.

Only trained and competent personnel may use this product.

Only trained and competent personnel may inspect, repair and maintain the product as detailed in this manual. Maintenance that is not detailed in this manual must be completed by MSA Bacharach or personnel qualified by MSA Bacharach.

Use only genuine MSA Bacharach spare parts and accessories. Otherwise, operation may be impaired.

Only operate the product within the framework of a risk-based alarm signaling concept.

Failure to follow these warnings can result in serious personal injury or death.

1 Safety

1.2 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 follow this warning can result in serious personal injury or death.

2 Description

2.1 Product Overview

The MSA Bacharach MGS-550 continuously monitors indoor or outdoor ambient air for the following gases:

toxic and combustible gases

oxygen

refrigerants.

The instrument is housed in a rugged ABS enclosure (general purpose or “GP” housing).

The instrument can be connected to a MSA Bacharach MGS-408 controller or a Programmable Logic Controller (PLC). With the integrated alarm relays, the instrument can be operated as a stand-alone unit (with additional local alarm signaling). The instrument is designed to be installed in non-classified, non-hazardous, permanent locations.

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2 Description

WARNING!

Danger of explosions. This product is neither certified nor approved to be operated in oxygen-enriched atmospheres.

The device is NOT intended to be used in areas classified as hazardous.

Failure to follow these warnings can result in serious personal injury or death.

2.2 Key Product Features

Enclosure options—General-purpose (GP): ABS plastic housing (rectangular)

Power options (refer to section 9.1 General Specifications):

24 VAC

19.5 to 28.5 VDC

Multi-function, 5-digit LED display

gas concentrations

status messages

menu choices

Diagnostic/status LEDs (3)

Digital output Modbus RTU signal

Independently configurable analog outputs (2) (based on measured gas concentration)

Analog output 4 to 20 mA

Analog output 0 to 5 V

Analog output 0 to 10 V

Analog output 1 to 5 V

Analog output 2 to 10 V

Redundant sensor mapping option (one sensor can be mapped to both analog outputs)

Menu navigation options:

Tactile switches on the front cover

Non-intrusive magnetic wand on the front cover

Non-intrusive magnetic wand can be used to configure, calibrate, and maintain the device

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2.3 General Overview

2 Description

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3 Installation

2.4 Sensor Styles

Local Sensor 5 m (16 ft) Remote Sensor

3 Installation

3.1 General Information for Installation

Every detail of installation site selection is critical to ensure overall system performance and effectiveness. Strict compliance and considerable thought must be given to every detail of the installation process, including, but not limited to the following:

Regulations as well as local, state, and national codes that govern the installation of gas monitoring equipment

Electrical codes that govern the routing and connection of electrical power and signal cables to gas monitoring equipment

The full range of environmental conditions to which the instruments will be exposed

The physical characteristics of the gas or vapor to be detected

The specifics of the application (e.g., possible leaks, air movement/draft, etc.)

The degree of accessibility required for maintenance purposes

The types of optional equipment and accessories that will be used with the system

Any limiting factors or regulations that would affect system performance or installations

Wiring details, including the following:

The general purpose enclosure provides six M16 entry points, which can be used for field wiring, direct attachment of a sensor, or wiring of a remote sensor.

Unused openings must be closed with a suitable plug and gasket, maintaining the IP rating.

Secondary circuit must be supplied from an isolating source (not applicable for relay circuits).

The wiring for the relays must be selected and fused according to the rated voltages, currents, and environmental conditions.

If stranded conductors are used, a ferrule should be used.

To improve RFI immunity in extreme environments, it might be necessary to ground the shield of the communications cable at the PLC, front-end controller, or Building Management System (e.g., the chassis, the ground bus-bar, etc.).

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3.2 Installation Restrictions

The installation location must have appropriate supply power available for the instrument (i.e., 19.5 to 28.5 VDC or 24 VAC). Refer to Section 9 Technical Data. This ultimately determines the distance the instrument can be mounted from the controller or power supply.

WARNING!

The MGS-550 must be powered by either:

a suitable UL/CSA/IEC 60950 certified power supply that is isolated from line voltage by double insulation, or

an appropriately rated UL listed/CSA/IEC Class 2 transformer.

Failure to follow this warning can result in serious personal injury or death.

The instrument accepts wire sizes of 16 AWG (1.5 mm2) to 20 AWG (0.5 mm2).

Depending on the configuration, use at least a shielded, multi-conductor cable.

The instrument must not be exposed to radiant heat that will cause the temperature to rise beyond the limits stated in Section 9 Technical Data. The use of a reflecting shield is recommended.

The enclosure is weatherproof within environmental specifications and suitable for outdoor installation.

Each instrument must be installed and operated in an environment that conforms to the specifications listed in Section 9 Technical Data.

3.3 Mechanical Installation

Select a mounting location that is accessible for maintenance and adjustment.

Ensure that any targeted gas or vapor has unobstructed access to the sensor.

Consider implications of the future use of accessories and maintenance equipment.

Ensure that the mounting surface is flat and plumb.

Ensure that any installed sensor is pointing downwards.

MSA Bacharach recommends using M5 bolts (or smaller) with hex socket caps to mount the device.

3.4 Electrical Installation

3.4.1 Preparations

WARNING!

• Ensure wiring for relays and connections for sensor(s) are made before applying power.

• This product uses semiconductors which can be damaged by electrostatic discharge (ESD). When handling the printed circuit boards (PCBs), observe proper ESD precautions so that the electronics are not damaged.

Failure to follow these warnings can result in serious personal injury or death.

NOTE: For unused 4 to 20 mA analog outputs, ensure that a jumper (pin 3 to 4 and pin 5 to 6) is installed. Otherwise, a

fault may be displayed if the wiring does not match the configuration. The analog outputs are designed as sources.

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• Open the enclosure lid. Loosen six (6) screws using an M5 hex key and remove the lid from the base.

• Disconnect the ribbon cable from the processor board on the lid. Set the lid aside and continue to wiring procedure.

3.4.2 Power and Signal Wiring

Using appropriate cable glands and/or conduit, connect the wires for power and signal to the appropriate terminal as indicated in the figure and wiring table that follow.

Polarity must not be reversed.

For 24 VAC installations in a daisy-chain configuration, the neutral polarity must be maintained for all instruments.

Fasten terminal screws.

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Connection Description Pin Label Wiring Termination

24 VAC

Power

24 VDC

Analog Output 1*

Analog Output

Analog Output 2*

Digital Output

Modbus Network Communications

* For 3-wire, single-sensor DC installations: connect pins 1 and 2 of 24 VDC, and connect pin 4 to the analog input of the control system. For 4-wire, dual-sensor DC installations: connect pins 1 and 2 of 24 VDC, connect pin 4 to one analog input of the control system, and connect pin 5 to another input of the control system.

1 +24 VDC/AC 24 VAC line 2 PWR GND 24 VAC neutral 1 +24 VDC/AC 24 VDC positive 2 PWR GND 24 VDC ground 3 ANALOG 1 GND Analog output 1 ground

4 ANALOG OUT 1

Analog output 1 signal (+)

5 ANALOG 2 GND Analog output 2 ground

6 ANALOG OUT 2

Analog output 2 signal (+)

7 RS-485 GND RS-485 shield

8 A

RS-485 “A” (noninverted)

9 B RS-485 “B” (inverted)

If central monitoring or a PLC is used, connect the signal cable shielding at the controller only.

If an analog output is unused and configured as a 4 to 20 mA output, then the corresponding output connectors must be shorted or jumpered, otherwise a fault will occur. For unused analog output 1 configured as 4 to 20 mA output, wire pin 3 to pin 4. For unused analog output 2 configured as a 4 to 20 mA output, wire pin 5 to pin 6. These jumper wires are installed at the factory, but should be removed for voltage outputs or if connections are made to the analog outputs.

3.4.3 Relay Wiring

WARNING!

At voltages > 30 VAC or > 42.2 VDC, the relay cables must be enclosed in protective conduit, or double-insulated cables must be used.

Failure to follow this warning can result in serious personal injury or death.

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3 Installation

Using appropriate cable glands and/or conduit, connect the wires for relay 1, relay 2, and relay 3 to the terminals (see previous wiring figure) as indicated in the following wiring table. (Note that any one of 6 alarms or 3 fault types may be mapped to any relay.)

Function Pin Label Wiring Termination

10 RELAY 1 NC Relay 1 NC contact

Relay 1 Output

Relay 2 Output

Relay 3 Output

To change relay designations, see section 4.4.2 Relay Designation (RX-xx). For default values, see section6 Factory

Default Settings.

When configured according to the factory default settings, the relays are de-energized during normal operation (not failsafe). Fail-safe mode can be configured and relay operation is opposite of the wiring table. See section 4.4.2 Relay

Designation (RX-xx). The terminal designators in the wiring table show factory defaults in normal operation (not

failsafe) mode with the relays de-energized.

11 RELAY 1 C Relay 1 common contact 12 RELAY 1 NO Relay 1 NO contact 13 RELAY 2 NC Relay 2 NC contact 14 RELAY 2 C Relay 2 common contact 15 RELAY 2 NO Relay 2 NO contact 16 RELAY 3 NC Relay 3 NC contact 17 RELAY 3 C Relay 3 common contact 18 RELAY 3 NO Relay 3 NO contact

NOTE: To ensure that a fault is easily “recognized” (that is, without needing to look directly at the instrument’s display), one relay should be designated for instrument faults and an alarm device should be connected to the fault relay.

3.4.4 Install Remote Sensing Head

Remove a blind-plug from the enclosure (if applicable).

Feed the connector of the sensor (see below, left) through a cable gland or conduit (if applicable), through the opening of the enclosure, and then into the enclosure.

Secure the cable gland (with attached gasket) or appropriate conduit into the housing in order to maintain IP rating.

Plug the sensor connector into the socket until the lock engages. For a new instrument with no sensor connected, it does not matter which socket is used first. However, if a sensor is already connected, then it should be left plugged into its socket.

If two remote sensors are to be installed, register only one sensor at a time. Refer to section 4.3.6 Register

Sensor (F-06).

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3 Installation

NOTE: Sensors are not automatically recognized and must but individually registered using function F-06. See section

4.3.6 Register Sensor (F-06), section4.3.7 De-register One Sensor (F-07), and section 4.3.8 De-register All Sensors and Reset Node Address (F-08).

3.4.5 Connecting One or More MGS-550s to an MSA Bacharach Controller

NOTE: For wiring and configuration information, please refer to the manual which was included with the MSA

Bacharach controller (e.g., MGS, etc.).

At the central control system, connect the shield of the wires to the earth ground of the controller (e.g., the chassis, the ground bus-bar, etc.).

For 24 VDC installations, the input is protected. If the polarity is reversed, the instrument will not power-up.

For 24 VAC installations in daisy-chain, the neutral polarity must be maintained for all instruments (see example below).

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3.4.6 Modbus RTU Interface

For the Modbus network use an 18 to 24 AWG (0.5 to 1 mm2) shielded twisted pair wire with a 120Ω characteristic impedance.

The Modbus address, baud rate, stop bit, parity and slave termination is configured through the setup menu. No jumpers or hardware switch settings are required.

Ensure that the communication parameters within the network, including the Building Management System, are configured identically. See section 4.4.5 Modbus Configuration (MB-xx).

If the MGS-550 is at the end of the Modbus network, the terminating resistor must be set to “IN”. All other instrument terminating resistor must be set to “OUT” (factory default). See section 4.4.5 Modbus Configuration

(MB-xx).

3.4.7 Conclusion

After all wiring is completed, connect the ribbon cable, replace the lid, and tighten the six (6) screws with an M5 hex key.

NOTICE

DO NOT allow the lid / sensor to hang from the ribbon cable. Failure to follow this notice may result in damage to the product.

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4 Operation

4.1 Overview of Normal Operation

WARNING!

Before leaving the instrument for normal operation, check the configuration for proper settings and check calibration.

Failure to follow this warning can result in serious personal injury or death.

4.1.1 Applying Power and the Start-up Sequence

After applying power, the instrument will go through a start-up sequence (LED test, software version, and initialization) and start the warm-up period. The power LED will blink and, by default, the display will remain blank. To enable the display of gas type and concentration, use parameter P1-01 which will cause the display to toggle between the target gas name and a value of “0” for the sensor in warm-up. See section 4.4.6 Display Mode (P1-01).

The instrument output will be OFFLINE (see section 4.3.1 Offline Mode (F-01)). If two sensors are installed, both target gas names and “0”s will be toggled sequentially.

NOTE: Sensor warm-up times may be different for dual sensor configurations. The power LED will continue to blink as long as at least one sensor is in warm-up.

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After the warm-up period, the instrument begins normal operation. The display toggles between the current gas concentration and target gas name.

During normal operation, the left green LED is lit solid. Depending on the unit of measurement, the green LED for ppm or %LEL is lit. If both of these LED are off, the unit of measurement is Vol%.

All configurations must be checked at least initially, and the calibration must be checked initially and as needed.

4.1.2 Verifying Analog Signals

During normal operation the current output of the instrument is proportional to the detected gas concentration and can be selected from the following.

4 to 20 mA

0 to 5 V

1 to 5 V

0 to 10V

2 to 10 V

The MGS-550 uses different current values to indicate various modes of operation. See section 9.1 General

Specifications for additional information.

4.1.3 Verifying the Digital Modbus Signal

The MGS-550 provides a Modbus RTU digital interface. All status messages and most parameters which can be accessed and/or configured through the menu can also be accessed and/or configured via a Building Management using a Modbus network. See section 4.4.5 Modbus Configuration (MB-xx).

4.1.4 The 5-Digit Display and LEDs

In normal operation, the 5-digit, 7-segment LED display toggles between the gas name (CO2 in this example, and the measured gas concentration (291 ppm in this example).

In addition, the following special symbols and unique messages may also be displayed during operation of the instrument.

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Symbol/Message Description

The measuring range of the sensor has been exceeded (“upper hockey sticks” symbol).

The sensor drifted negative (<0) (“lower hockey sticks” symbol).

If a fault has been detected, the display toggles between gas name and "Exxx", and the green power LED is off. "E100" indicates a critical fault and "E300" indicates a non-critical fault. A non-critical fault does not need immediate attention, but should be mitigated at the next scheduled maintenance (see section 5 Maintenance). If a relay has been designated to the critical fault, it is asserted. E400 is a configuration warning that happens after a second sensor is added to warn the user that the sensor is not driving any relays or analog outputs.

When the first alarm has been triggered, the display will toggle between gas name, "A1" and current gas concentration. If a relay has been designated to the first alarm, it is asserted.

4 Operation

When the second alarm has been triggered the display will toggle between gas name, "A2" and current gas concentration. If a relay has been designated to the second alarm, it is asserted.

When the third alarm has been triggered the display will toggle between gas name, "A3" and current gas concentration. If a relay has been designated to the third alarm, it is asserted.

The instrument is offline. See section 4.3.1 Offline Mode (F-01).

The first character represents an “M”. This is found in the Modbus parameters (MB-xx). Refer to section 4.4.5 Modbus Configuration (MB-xx).

This is a confirmation that is displayed before a sensor is registered. Tap [ENTER] to confirm registration of sensor 1 or registration of sensor 2. For more information, refer to section 4.3.6 Register Sensor (F-06).

This message is shown after successful completion of a functional operation of one of the sensors (for example, after registering a sensor, after calibrating a sensor, etc.).

This is a confirmation display prior to de-registering all sensors and resetting node addresses (F-08). Tap [ENTER] to confirm reset. See section 4.3.8 De-

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Symbol/Message Description

This is a second confirmation display prior to de-registering all sensors and resetting node addresses (F-08). Tap [ENTER] to confirm reset. section 4.3.8

De-register All Sensors and Reset Node Address (F-08) for additional

information.

The unit of measurement is indicated by two green LEDs on the right side (upper LED for ppm, lower LED for %LEL, both LEDs off for Vol%). The green LED on the left indicates that the instrument is in normal operation.

NOTE: If two sensors are installed for the same gas, but have different measuring ranges, the unique sensor identifier or UID (see label on the sensor) will be displayed in addition to the gas name.

NOTE: Depending on the sensor and measuring range, the gas concentration may or may not be shown with a decimal point.

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4.2 Menus

4.2.1 General Navigation

The MGS-550 offers two methods of navigating through the menu.

4 Operation

• Use the non-intrusive magnetic wand (tapping above the “magnetic” icons with dashes)

Magnetic Switch

Points

Internal Push

Button Points

Tapping/pressing and holding the [i] key for more than 3 seconds gives access to the user menu (which displays the firmware version first). It is also used to return to the next higher menu item without saving any changes (“escape”). A short tap/press (< 3 seconds) of the [i] key also brings up a sensor identification on the display, toggling between the serial number (UID) of Sensor 1 and Sensor 2.

Tapping/pressing the magnetic wand over the [UP] / [DOWN] keys scrolls through the menu selections. Holding the magnetic wand at the key is interpreted as repeat tapping with an eventual acceleration. When the last menu item is reached, the menu will roll over to the first menu item in the list. A diagnostic scan can be entered from normal operation by tapping and holding [UP] for more than 3 seconds.

Tapping/pressing the [ENTER] key (↵ ) confirms a selection. In normal operation tapping/pressing and holding the [ENTER] key for more than 3 seconds will cancel the OFFLINE mode, or release any latched alarm, or acknowledge any acknowledgeable alarm, with priority given to OFFLINE mode.

• Use the internal push buttons (pressing the push button points).

Function(s)

NOTE: The instrument is designed for the magnetic wand to be used with the enclosure lid in place. If the enclosure lid

is not in place, the magnetic wand may activate two or more keys at once due to cross-talk.

NOTE: After 3 minutes of inactivity within a menu, the instrument times-out and returns to normal operation. When changing a parameter, 3 minutes of inactivity will cause the instrument to time out and return to normal operation without accepting any changes.

4.2.2 Checking Status and Changing Parameter Values

Select the menu item to be accessed by tapping [UP] / [DOWN].

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When the desired menu item is displayed, tap [ENTER]. The current value or status will flash to indicate the user interface has switched to data entry mode.

[UP] / [DOWN] adjust the value of a numerical parameter or scroll through preset choices.

Once the display shows the intended value or choice, tap [ENTER] to validate the new parameter and return to the previous menu.

4.2.3 Exiting the Menu

To get back into measurement mode, tap and hold the [i] key for more than 3 seconds. This will step back through the menus and eventually return to normal operation.

4.2.4 Menu Overview

The menu is divided in functions and parameters. Individual parameters are grouped into logical menus.

Function Description

F-01 00 = instrument online, 01 = instrument OFFLINE F-02 1 = zero sensor 1, 2 = zero sensor 2 F-03 1 = span sensor 1, 2 = span sensor 2 F-04 Instrument test

Access parameters:

Parameters Description

S1-XX Sensor 1 settings S2-XX Sensor 2 settings – if connected

F-05

F-06 Register sensor F-07 De-register one sensor F-08 De-register all sensors and reset node address F-09 Access diagnostics, system information, and fault parameters F-10 Reset system to factory default setting

An example of the layered structure of functions, menus, and parameters is illustrated below. Individual functions and parameters are described in detail in the sections that follow.

RX-XX Relay settings AF-XX Alarm functions AX-XX Analog output configuration MB-XX Modbus configuration

P1-01 Display mode

B1-XX Buzzer settings

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4.3 Functions

4.3.1 Offline Mode (F-01)

In OFFLINE mode the instrument does not respond to alarm conditions, but allows the execution of functions and the setting of parameters. OFFLINE mode is useful in eliminating false alarms while performing maintenance.

To enter OFFLINE mode, change F-01 to 01.

To cancel OFFLINE mode, change F-01 to 00 or tap and hold [ENTER] for more than 3 seconds from the top level menu.

NOTE: OFFLINE mode automatically times out 30 minutes after returning to normal operation (i.e., after exiting the function menu).

Item Behavior in OFFLINE Mode

Green LED On

Display

Analog Output

Displays “oFFLn” or function and parameter numbers or user interaction in place of the gas level when applicable

4 to 20 mA Changes to 3 mA 0 to 5 V Stays at last valid value 0 to 10 V Stays at last valid value 1 to 5 V 0 V 2 to 10 V 0 V

Modbus Registers

Offline flag (Modbus register 10024) is active (must be monitored).

Concentration registers stay at their last valid values.

Alarm States Any pre-existing alarm condition is cancelled

Faults

Faults remain active, but actions based on any pre-existing fault are de-asserted (e.g., relays, buzzer, and Modbus flags).

4.3.2 Zero Adjustment (F-02)

This function is used to adjust the zero reference point of the sensor. See section 5.2.3 Zero Adjustment for information.

4.3.3 Span Adjustment (F-03)

This function is used to adjust the sensitivity to match the known concentration of an applied calibration gas. See section 5.2.4 Span Adjustment for information.

4.3.4 Instrument Test (F-04)

This function tests the relays, display, and analog outputs by temporarily overriding them. It might be necessary to inhibit the alarms at the central controller to avoid false alarms.

Use the [UP] / [DOWN] key to select the test to be performed:

1 = relay test

2 = analog output test

3 = display test.

After exiting this function, the instrument returns to the function menu and all test overrides are removed.

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4 Operation

# Test Description

The relay test changes the state of each relay. Use the [UP] / [DOWN] key to toggle the relay. Tap

1 Relay

Analog

Output

3 Display The display test lights up all segments and LEDs.

4.3.5 Parameter Menu (F-05)

Use this function to access the parameter menu. See section 4.2.4 Menu Overview and section 4.4 Parameters for detailed information.

[ENTER] to test the next relay. Tap [i] to exit the function.

Note that changing the state of the relays can trigger alarms in connected equipment.

The analog output test allows you to set the output for interface test purposes (e.g., to check the programming of a central controller).

Tapping [ENTER] will set the analog output to the level equivalent to zero gas. For a 4 to 20 mA configuration this output will be 4 mA; for a 1 to 5 V configuration this output will be 1 V; and so on. Use the [UP] / [DOWN] key to change the value of the zero output.

After tapping [ENTER], the analog output will be set to full scale. Use the [UP] / [DOWN] key to adjust the value of the full-scale output.

NOTE: Changing the analog outputs can trigger alarms in connected equipment.

4.3.6 Register Sensor (F-06)

Function F-06 is used to register a new sensor without having to cycle power.

In general, sensor registration is the association of parameters in the instrument to the set in the sensor. Registration occurs at the factory for the local sensor and is based on the sensor configuration that is ordered. If the sensor configuration must be changed (e.g., changing a sensor type or adding a second sensor), then the new sensor must be registered.

NOTICE

Before unplugging ANY sensor, it must be de-registered using function F-07.

Failure to do this will require you to de-register all sensors using F-08 (with the sensors still connected to the main electronics), remove the sensors, and then re-install and re-register the sensors one at a time using function F-06.

If the sensors are not connected when an F-08 is performed, then their node addresses will not be reset. Refer to the following NOTICE for information on resetting node addresses.

New sensors all have address 100. The first sensor registered will be sensor #1 and the second sensor #2.

Resetting sensor registration through F-08 will reset them all to 100; then they need to be registered one at a time.

To register a newly added sensor, select F-06 and tap [ENTER]. There are 3 possible scenarios.

Scenario Description

Sensor is

already

registered

Normal

registration/

adding a

sensor

Address

conflict

If there is already one sensor connected and it has already been registered, the F-06 display is shown after a brief delay.

If the newly added sensor was previously unregistered or de-registered (i.e., address 100), “reg 1” or “reg 2” will be displayed (depending on the configuration). Tap [ENTER] to confirm registration of the sensor. “PASS1” or “PASS2” will be displayed.

If a sensor was previously registered in an instrument, was not de-registered, was removed, and then

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Scenario Description

plugged in to a different instrument, then a critical fault (E100 error) will occur.

Refer to function F-08 to resolve.

4.3.7 De-register One Sensor (F-07)

This function resets the registration of a sensor and changes a 2-sensor system to a 1-sensor system.

NOTE: Removing a sensor without first de-registering it will result in a fault. Always de-register a sensor before permanently removing it.

Tap [ENTER] to display the unique sensor identifier (UID). Use the [UP] / [DOWN] keys to select the sensor to be removed. After tapping [ENTER], the sensor can be disconnected. See section 5.4 Sensor Maintenance for information.

NOTE: A sensor’s user-editable parameters (e.g., alarm setpoints, etc.) are not retained after it is de-registered. If a sensor is registered again, all parameters will be set to their factory default values.

4.3.8 De-register All Sensors and Reset Node Address (F-08)

Two sensors connected to the instrument that have the same node address will result in a fault. Function F-08 can be used to recover from this situation by resetting the registration of all sensors and resetting their node addresses to 100.

Tap [ENTER]. The instrument will show “Reset”.

Tap [ENTER] to confirm reset. Instrument will show a second confirmation (“sure”).

Tap [ENTER] again to reset the node address. “Pass” will be displayed.

Unplug the sensors.

Plug in one sensor and register it. See section 4.3.6 Register Sensor (F-06).

Plug in second sensor and register it.

Be sure to plug in the sensors and re-register them one at a time to avoid address conflicts.

NOTICE

Before unplugging ANY sensor, it must be de-registered using function F-07.

If the sensors are not connected when an F-08 is performed, then their node addresses will not be reset.

4.3.9 Diagnostics, System Information and Fault Data (F-09)

This function will display any diagnostics and fault codes.

Tap [ENTER] to initiate the function.

Use the [UP] / [DOWN] keys to select a diagnostics code.

After tapping [ENTER], the respective code will be displayed.

See section 5.3 Troubleshooting for additional information.

NOTE: The diagnostics attributes can be accessed directly during normal operation by tapping and holding [UP] for more than 3 seconds.

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4.3.10 Reset System to Factory Default Setting (F-10)

This function will restore factory default values of all application specific parameter settings. See section 6 Factory

Default Settings for a list.

NOTE: Resetting the system to its factory default values will not reset sensor calibrations.

NOTE: Function F-10 resets all parameters (except sensor registration information) to their factory default values (see

section 6 Factory Default Settings). Before executing this function, consider recording all parameter settings in case you wish to reset one or more of them to their former values.

Tap [ENTER] to initiate this function. A "SURE" confirmation prompt is given.

Tap [ENTER] to confirm the reset.

All LED segments will light up for 3 seconds.

Parameter settings will change to factory default values.

The internal buzzer will sound for 3 seconds.

After another 3 seconds the instrument will return to the main menu.

After an F-10 system reset, the instrument will be in a “known state”, and the parameters can be set.

4.4 Parameters

4.4.1 Sensor 1 Settings (S1-xx) and Sensor 2 Settings (S2-xx) if Connected

S1 & S2

Name (n=1 or 2) Description (n=1 or 2)

Param

S1-01 S2-01 Sensor n Gas Name Abbreviated Gas Name S1-02 S2-02 Sensor n UID Unique 5-digit sensor ID (serial number)

Value above which a low alarm condition occurs. Low alarm value must be less than the medium and high alarm values (Sn-03 < Sn-04 < Sn-

S1-03 S2-03

S1-04 S2-04

S1-05 S2-05

S1-06 S2-06

S1-07 S2-07

S1-08 S2-08

Sensor n Low Alarm ppb/ppm/%LEL/Vol%

Sensor n Medium Alarm ppb/ppm/%LEL/Vol%

Sensor n High Alarm ppb/ppm/%LEL/Vol%

Sensor n Low Alarm Behavior

Sensor n Medium Alarm Behavior

Sensor n High Alarm Behavior

S1-09 S2-09 Sensor n Type Code 4-digit sensor code (read-only)

05). (See oxygen sensor notice below.)

This parameter has a fixed minimum limit that is sensor–specific and not editable.

Value above which a medium alarm condition occurs. Medium alarm value must be between low and high alarm values (Sn-03 < Sn-04 < Sn-05). (See oxygen sensor notice below.)

Value above which a high alarm condition occurs. High alarm value must be greater than low and medium alarm values (Sn-03 < Sn-04 < Sn-05). (See oxygen sensor notice below.)

0 = Disabled 1 = Non-latching, not acknowledgeable 2 = Non-latching, acknowledgeable 3 = Latching, not acknowledgeable 4 = Latching, acknowledgeable

Read-Only. Sensor n measurement units:

1 = ppm

S1-10 S2-10 Sensor n Units

2 = ppb 3 = Vol% 4 = %LEL

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S1 & S2

Name (n=1 or 2) Description (n=1 or 2)

Param

S1-11 S2-11 Sensor n Full Scale Read-Only. Sensor n full-scale units: ppb or ppm or Vol% or %LEL.

When set to 1, this flag indicates that a calibration is recommended. This flag can be reset to 00 by either successfully completing a span adjustment (see section 5.2.4 Span Adjustment) or by changing the

S1-12 S2-12 Sensor n Test Flag

The following parameters are sensor dependent.

Low alarm limit (S1-03 and S2-03)

High alarm limit (S1-05 and S2-05)

Unit of measurement (S1-10 and S2-10)

Factory default values for the alarm thresholds

NOTE: A fixed hysteresis of 5% of full scale is set in order to avoid chatter at an alarm threshold.

NOTE: For all instruments except oxygen, the alarm occurs on gas concentrations that increase beyond the set-points.

value manually.

0 = Sensor OK 1 = Sensor in operation for >6 months without calibration. Recalibration

recommended.

NOTE: For all instruments monitoring oxygen, the low and medium alarms occur on concentrations that decrease below the set-points. The high alarm occurs on gas concentrations that increase beyond the set-point. This permits the detection of oxygen displacement and enrichment scenarios.

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4 Operation

NOTE: Alarm hierarchy exists. An A2 alarm overrides an A1 alarm on the display. However, the A1 and A2 states

operate independently. An example follows.

A1 is acknowledgeable

A2 is not acknowledgeable

The gas concentration is such that it triggers A1 and A2

Acknowledging will cause the A1 relay to release. However, the display will still show an A2 alarm as long as the A2 condition continues to exist. The same is true for A3 and A2.

Latching and acknowledgment settings of alarms may be combined to create unique scenarios.

Latching means that once the alarm level is reached, the instrument will trigger the alarm and it will remain in alarm status even if the gas concentration subsequently does not meet the alarm condition any more. To clear a latching alarm it has to be acknowledged by tapping and holding [ENTER] for more than 3 seconds.

Non-latching means that the alarm status clears if the gas concentration does not meet the alarm condition anymore.

Acknowledgeable means that the alarm relay can be reset before the alarm condition clears.

Not acknowledgeable means that the alarm relay cannot be reset until the alarm condition clears.

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Latching Acknowledgeable Explanation

No No

No Yes

Yes No

Yes Yes

Latching and acknowledgment does not just affect relay states, but also the buzzer state and Modbus status flags.

4.4.2 Relay Designation (RX-xx)

The alarm state will reset automatically when the alarm condition clears. The alarm state cannot be reset manually before the alarm condition clears.

The alarm state will reset automatically when the alarm condition clears or can be reset manually.

The alarm state must be reset manually. The alarm state cannot be reset before the alarm condition clears.

The alarm state must be reset manually and can be reset before the alarm condition clears.

Parameter Name Description

R1-01

R1-02 Relay 1 Source

R2-01

R2-02 Relay 2 Source

R3-01

R3-02 Relay 3 Source

Relay 1 Contact Behavior

Relay 2 Contact Behavior

Relay 3 Contact Behavior

Select behavior for Relay 1: 0 = NO, 1 = Failsafe.

Select alarm configuration (01 to 14) to activate Relay 1:

01: Sensor 1 Low Alarm 02: Sensor 1 Medium Alarm 03: Sensor 1 High Alarm 04: Sensor 1 Fault 05: Sensor 2 Low Alarm 06: Sensor 2 Medium Alarm 07: Sensor 2 High Alarm 08: Sensor 2 Fault 09: Instrument Electronics Critical Fault 10: Any Low Alarm 11: Any Medium Alarm 12: Any High Alarm 13: Any Sensor Fault or Instrument Electronics Critical Fault 14: Any Alarm or Sensor Fault or Instrument Electronics Critical Fault

Select behavior for Relay 2: 0 = NO, 1 = Failsafe.

Select alarm configuration (01 to 14) to activate Relay 2. See R1-02 above for source codes.

Select behavior for Relay 3: 0 = NO, 1 = Failsafe.

Select alarm configuration (01 to 14) to activate Relay 3. See R1-02 above for source codes.

The relays can be independently designated to any configuration below.

For example, consider a 2-sensor system with relays configured as follows:

R1-02=01 Relay 1 configured as 01 (Sensor 1 Low Alarm).

R2-02=06 Relay 2 configured as 06 (Sensor 2 Medium Alarm).

R3-02=13 Relay 3 configured as 13 (Any Sensor Fault or Instrument Electronics Critical Fault).

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In this configuration, the following would occur:

Relay 1 will activate when the low alarm of sensor 1 is triggered.

Relay 2 will activate when the medium alarm of sensor 2 is triggered.

Relay 3 will activate when any sensor or instrument fault occurs (either sensor).

It is possible to dedicate the same alarm configuration to multiple relays. For example, sensor 1 high alarm could be mapped to relay 1 and relay 2 (for redundancy).

NOTICE

With integrated relays, the instrument can be operated stand-alone without a central controller (with additional local alarm signaling). It is recommended to designate one relay as fault relay (e.g., configuration 13).

4.4.3 Alarm Configuration (AF-xx)

Parameter Name Description

00 = no delay, 01 to 15 = delay in minutes.

If an alarm ON delay is set, the gas concentration has to be continuously above (below for oxygen low and medium alarms) the alarm threshold for the delay time before the alarm is triggered or activated.

AF-01

Alarm ON Delay Value

NOTE: Once programmed, all alarms have the same ON delay.

00 = no delay, 01 to 15 = delay in minutes.

If an alarm OFF delay is set, the gas concentration has to be continuously below

AF-02

Alarm OFF Delay Value

(above for oxygen low and medium alarms) the alarm threshold for the delay time before the alarm is deactivated. If the alarm is acknowledgeable, the alarm OFF delay will be terminated as soon as it is acknowledged.

NOTE: Once programmed, all alarms have the same OFF delay.

0 = non-latching, 1= latching

AF-03

Critical Fault Latch Mode

Latching means that any critical fault state will remain active (even if the event creating the fault is cleared) until the user manually clears the fault state with the "ENTER" key.

00 = no timeout, 01 to 59 = delay in minutes

NOTE: If an alarm state has been acknowledged, but the condition still exists after the timeout period, the alarm state will be triggered again.

AF-04

Alarm Acknowledge Timeout

4.4.4 Analog Output Configuration (AX-xx)

Parameter Name Description

A1-01 Analog Output 1 Source

A1-02 Analog Output 1 Type

A1-03 Analog Output 1 Scaling

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1 = Sensor 1 2 = Sensor 2

0 = 0 to 5 V 1 = 1 to 5 V 2 = 0 to 10 V 3 = 2 to 10 V 4 = 4 to 20 mA

Scales the FSD (full-scale deflection), i.e., the measuring range, between 20 and 100% FSD, to the maximum analog output (e.g., 20 mA).

The selected full scale deflection determines the analog output (e.g., 20 mA

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Parameter Name Description

signal) on the analog interface.

Example: Consider an application with a required range of 0 to 20,000 ppm CO2 with a min and max of 4,000 ppm and 20,000 ppm, respectively.

To select full scale deflection as 10,000 ppm, set this parameter to 50%. The analog output will be linear between 4 mA (= 0 ppm) and 20 mA (= 10,000 ppm). However, the resolution of the sensor stays at the value for the max range.

NOTE: Alarm thresholds will not be changed when scaling the analog output. These must be set separately. See section 4.4.1 Sensor 1 Settings

(S1-xx) and Sensor 2 Settings (S2-xx) if Connected.

Sets an analog offset (± 410 = ± 10% of full scale) at the zero point. This parameter adds an offset to the analog output. The offset is constant over the entire range of the analog signal. No re-calibration necessary. This

A1-04 Analog Output 1 Offset

A2-01 Analog Output 2 Source Same as A1-01, but for output 2 (see description above). A2-02 Analog Output 2 Type Same as A1-02, but for output 2 (see description above). A2-03 Analog Output 2 Scaling Same as A1-03, but for output 2 (see description above). A2-04 Analog Output 2 Offset Same as A1-04, but for output 2 (see description above).

parameter is essential for an installation where the analog current at the instrument differs from the current at the central controller.

NOTE: The offset can be positive or negative, but can’t take the output below the zero gas level (e.g., 4 mA for 4-20 mA).

4.4.5 Modbus Configuration (MB-xx)

Parameter Name Description

MB-01 Modbus Node Address Set the RS-485 node address (001 to 255)

MB-02 RS-485 Baud Rate

MB-03 RS-485 Stop Bits 1 or 2

MB-04 RS-485 Parity

MB-05

4.4.6 Display Mode (P1-01)

Modbus Slave Termination

0 = 9600 1 = 19200

0 = None 1 = Odd 2 = Even

0 = Out 1 = In

Parameter Name Description

Defines whether or not the gas name and concentration are displayed during normal operation.

P1-01 Display Mode

0 = OFF (gas name and concentration will not be shown) 1 = ON (gas name and concentration will be shown)

If an alarm or fault condition occurs, the display will be turned on to show the error code(s).

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4.4.7 Buzzer Designation (B1-xx)

Parameter Name Description

5 Maintenance

B1-01

Buzzer Enable and Source

Select alarm configuration (01 to 14) to activate Buzzer.

00 = Buzzer disabled

Each MGS-550 has a built-in buzzer which can be designated to any alarm configuration. Refer to section 4.4.2 Relay

Designation (RX-xx) for a list of alarm configurations.

5 Maintenance

5.1 Maintenance Intervals

Interval Function

Check calibration.

During Commissioning

Every 6 Months*

As Required Replace sensor(s). See section 5.4 Sensor Maintenance.

* Maintenance intervals must be established for each individual installation. Depending on safety considerations, application-specific conditions, and local regulations, the 6-month maintenance intervals might need to be shortened.

Check signal transmission to the central controller. Check LEDs for proper operation. Check for proper triggering of alarm devices. Inspection by trained service personnel. Check signal transmission to the central controller. Check LEDs for proper operation. Check for proper triggering of alarm devices. Calibrate the sensor or contact MSA Bacharach for sensor

exchange with factory-calibrated sensor.

5.2 Making Adjustments to Sensors

5.2.1 Introduction

Adjustment of the instrument must be performed at regular intervals as detailed above.

WARNING!

Breathing Hazard: Calibration gas must not be inhaled! See appropriate Material Safety Data Sheets. Calibration gas

should be vented into a fume hood or to the outside of the building.

Zero First, Then Span: For proper operation, never adjust the span before completing a zero adjustment. Performing these operations out of order will cause faulty calibration.

MSA MSA Bacharach recommends calibrating instruments within the application-specific condition and with target gas. This method of zeroing the instrument in the application environment and performing a target gas calibration is more accurate. A surrogate gas calibration may only be performed as an alternative if a target gas calibration is not possible.

Failure to follow these warnings can result in serious personal injury or death.

NOTE: The sensor should be fully warmed-up (refer to section 4.1.1 Applying Power and the Start-up Sequence).

NOTE: When entering the functions F-02 (zero adjustment) or F-03 (span adjustment), the instrument will automatically

enter OFFLINE mode. The instrument will remain OFFLINE until either the OFFLINE mode is canceled using function F-01 (see section 4.3.1 Offline Mode (F-01)), or the OFFLINE mode times out within 30 minutes after the adjustment has ended. This is to avoid false alarms caused by residual cal gas. If the adjustment has not been completed, the

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instrument will abort the zero or span adjustment after 5 minutes of the last of interaction. No new data will be saved and the instrument remains OFFLINE.

5.2.2 General Procedure

Ensure the instrument has been powered on for at least 1 hour prior to beginning the sensor adjustment procedure. For semiconductor sensors, you must wait at least 24 hours.

Attach the pressure regulator to the calibration gas cylinder.

Attach tubing to the pressure regulator.

Attach calibration adapter to the tubing.

Connect the tubing to the calibration port (the barbed fitting) of the splash guard.

The gas flow should be approximately 0.3 to 1.0 L/min.

Access the appropriate function (as needed) and begin the zero, span, or bump test.

NOTE: If the intended operation is at higher altitudes, the factory calibration will result in a reading that is lower than the reading at sea level (a result of reduced partial pressure). A new span adjustment is recommended if the altitude or the ambient pressure is changed. The factory calibration is set to sea level.

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5.2.3 Zero Adjustment

5 Maintenance

WARNING!

• Ambient air can be used to zero the sensor instead of nitrogen or synthetic air only if the area is known to be free of the target gas or any gas to which the sensor may be cross-sensitive (as listed on the sensor data sheet). In this case, no cylinder or calibration adapter is needed for the zero adjustment. For semiconductor sensors, you must use synthetic air only.

• For oxygen (O2) and carbon dioxide (CO2) sensors, use only nitrogen (N2) gas.

Failure to follow these warnings can result in serious personal injury or death.

NOTE: A sensor must be re-zeroed if it shows underflow saturation.

Enter the menu and select function F-02 Zero Sensor.

Use [UP] / [DOWN] to select the sensor to be calibrated, then tap [ENTER].

Apply “synthetic” air (i.e., 20.9% zero air) or nitrogen (see section 5.2.2 General Procedure) and tap [ENTER]. The display will show the current value blinking (e.g., “2”). The gas value may go negative. This is normal.

Wait for the current gas concentration value to stabilize.

Tap [ENTER] to save the calibration data.

The instrument will indicate success status with a “PASS” display. Otherwise a “FAIL” message is displayed.

Turn off gas flow and remove the calibration adapter from the sensor or disconnect the tubing.

For oxygen, ensure that the concentration is above the displacement alarm thresholds.

Tap [ENTER] to exit the function.

5.2.4 Span Adjustment

Enter the menu and select function F-03 Span Sensor.

Use [UP] / [DOWN] to select the sensor to be calibrated, then tap [ENTER].

The last span gas concentration will be displayed.

Use [UP] / [DOWN] to change the value to match the concentration of the calibration gas (in the units of the sensor – i.e., ppm, Vol %, %LEL, etc.), and tap [ENTER].

Apply span gas (see section 5.2.2 General Procedure) and tap [ENTER].

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The display will show the current gas concentration value blinking in the units of the sensor – i.e., ppm, Vol %, %LEL, etc. (e.g., “100”).

Wait for the current gas concentration value to stabilize.

Tap [ENTER] to perform the calibration adjustment.

The instrument will indicate success status with a “PASS” display. Otherwise a “FAIL” message is displayed.

Turn off gas flow and remove the calibration adapter from the sensor or disconnect the tubing.

Ensure that the concentration is below the alarm thresholds.

For oxygen, ensure that the concentration is below the enrichment alarm thresholds.

Tap [ENTER] to exit the function.

5.2.5 System Bump Test

A system bump test is a live test of a system to verify that the instrument responds to gas and that all connected alarm devices, controllers, etc. are operating appropriately. In this case, be sure to inform all involved persons about the test and that certain alarms might have to be inhibited (e.g., process shutdown, notification of authorities, etc.)

Apply target gas; if required a sufficiently high concentration (low concentration for oxygen displacement) to trigger alarms.

The display will show the current gas concentration value.

Once the alarm thresholds are exceeded, verify that all designated gas alarm relays are activated and the analog and digital outputs properly transmitted the corresponding gas concentrations.

Turn off gas flow and remove the calibration adapter from the sensor or disconnect the tubing.

5.3 Troubleshooting

5.3.1 Hexadecimal Format

All fault codes are shown in hexadecimal (hex) format. A hex digit can represent multiple codes as shown below.

Hex

Code

Equivalent

Error Code(s)

Hex

Code

Equivalent

Error Code(s)

Hex

Code

Equivalent

Error Code(s)

Hex

Code

Equivalent

Error Code(s)

0 0 4 4 8 8 C 4 + 8 1 1 5 1 + 4 9 1 + 8 D 1 + 4 + 8 2 2 6 1 + 2 + 3 A 2 + 8 E 2 + 4 + 8 3 1 + 2 7 1 + 2 + 4 B 1 + 2 + 8 F 1 + 2 + 4 + 8

5.3.2 Diagnostics Attributes

Attribute Description

Reads the current instrument fault code xxxx:

0000 = No faults

0001 = Reported temperature outside operating range (Non-critical, E300)

D-01

0002 = Master RX buffer full (Non-critical, E300)

0004 = Slave RX buffer full (Non-critical, E300)

0008 = CRC error in received packet (Non-critical, E300)

0010 = CRC error in received packet (Non-critical, E300)

0020 = Packet timeout (Non-critical, E300)

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Attribute Description

0040 = Either Current loop open (Non-critical, E300)

0080 = Stuck key or magnetic switch (Non-critical, E300)

0100 = No registered sensors (Critical, E100)

0200 = Sensor 1 reporting a critical fault (Critical, E100)

0400 = Sensor 2 reporting a critical fault (Critical, E100)

5 Maintenance

0800 =

1000 =

Sensor 1 is registered, but not responding correctly or wrong sensor installed

Sensor 2 is registered, but not responding correctly or wrong sensor installed

2000 = Power supply voltage(s) out of range (Critical, E100)

4000 = MPU clock fault (Critical, E100)

8000 = Can’t read EEPROM (Critical, E100)

For more information on these faults, refer to table in section 5.3.3 Instrument Electronics Critical (E100)

Faults and section 5.3.4 Non-Critical (E300) Faults. Refer to section 5.3.1 Hexadecimal Format for

combined codes.

D-02

Displays the last fault that occurred since first start-up or since the data logger was last erased. See D-01 for more information. Tap [ENTER] to clear.

D-03 Supply voltage

D-04

D-05

Number of days since the last span calibration of Sensor 1. This value automatically resets to 0000 after completing a span adjustment via F-03.

Number of days since the last span calibration of Sensor 2. This value automatically resets to 0000 after completing a span adjustment via F-03.

Sensor 1 current fault code xxxx:

0000 = No faults 0001 = No sensor signal 0002 = Sensor board hardware fault 0004 = EEPROM checksum fault 0008 = Zero adjust out of range 0010 = Span adjustment out of range 0020 = Input voltage fault 0040 = Microprocessor fault

D-06

0080 = Software fault 0100 = RS485 receiver fault 0200 = RS485 checksum fault 0400 = Modbus fault 0800 = Temperature sensor fault 1000 = Temperature out of range fault 2000 = Analog front end communications fault 4000 = Negative gas concentration fault 8000 = Sensor configuration fault

(Critical, E100)

For more information on these faults, Refer to table in section 5.3.5 Sensor Faults. Refer to section 5.3.1

Hexadecimal Format for combined codes.

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Attribute Description

D-07 Sensor 1 last fault code. See D-07 list. To clear, see Diagnostics D-02. D-08 Sensor 2 current fault code. Same as D-07. See D-07 list. D-09 Sensor 2 last fault code. See D-07 list. To clear, see Diagnostics D-02. D-10 Temperature of main electronics (in °C).

5.3.3 Instrument Electronics Critical (E100) Faults

Critical faults are indicated by “E 100” on the display. Critical faults indicate a functional problem that results in the gas detector no longer monitoring gas reliably. See D-01 and D-02.

Code Critical Fault Possible Causes Remedy

0200

0400

0800 Sensor 1 error

1000 Sensor 2 error

2000

4000

8000

Sensor 1 critical fault

Sensor 2 critical fault

One or more power supply voltages out of range

Micro-processor fault

Can’t read EEPROM

No sensor or defective sensor.

Sensor removed and not deregistered.

Two with same node address.

Same as Sensor 1. See above.

Sensor is registered, but not responding correctly or the wrong sensor installed.

Input supply power to the MGS-550 is out of range.

Internal electronics hardware error.

Add sensor. Replace sensor.

Deregister sensor, then remove. See section 4.3.7 De-

De-register both sensors and re-register them one at a time. See section 4.3.8 De-register All Sensors and Reset Node

Address (F-08) and section 4.3.6 Register Sensor (F-06).

Same as Sensor 1. See above.

Sensor was removed. Replace sensor. Sensor was replaced without re-registration. Register sensor. See section 4.3.6

Correct the input supply voltage to restore normal operation. See section 9.1 General Specifications.

Cycle power to the instrument.

A possible hardware problem may exist. Contact the factory.

5.3.4 Non-Critical (E300) Faults

Non-critical faults are indicated by “E 300” on the display. Non-critical faults indicate issues such as environmental conditions being outside of specification, an installation error has occurred (wrong wiring, for example), and so on.

The gas detector will continue to monitor, but may produce less accurate readings and may not respond correctly to gas alarm events. A non-critical fault might not need immediate attention, but should be mitigated at the next scheduled maintenance (at the latest). See D-01 and D-02.

Code Critical Fault Possible Causes Remedy

Reported

0001

0002

36 MGS-550 US

temperature outside operating range

Master receiver buffer full

Instrument temperature is outside specification

RS-485 Message too long for receiver buffer

Verify that ambient air conditions are within specifications range for the instrument (see section 9.1 General

Specifications) and for the sensor (see section 9.2 Sensor Specifications). Correct ambient air conditions.

Cycle power to the instrument.

Cycle power to the PLC or control system (if applicable).

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Code Critical Fault Possible Causes Remedy

Verify proper shielding on network communications wiring. Refer to section 3.1 General Information for

0004

Slave receiver buffer full

Installation and section 9.1 General Specifications for

more information.

5 Maintenance

Checksum

0008

0010

0020 Packet timeout

0040

5.3.5 Sensor Faults

NOTE: If a sensor fault occurs during a gas alarm condition, then the fault overrides the alarm condition for that sensor

(i.e., the alarm state(s) for that sensor “de-assert” and the display shows “E 100”). Similarly, if a critical fault occurs, then all active alarm conditions will “de-assert”.

Sensor faults (for diagnostic attributes D-07 to D-10) may be decoded using the following table. Note that several faults may be reported at the same time (see section 5.3.1 Hexadecimal Format for more information). For example, fault code “0003” is a combination of fault codes 0001 (No sensor signal) and 0002 (sensor board hardware fault). See D-07 through D-10.

(CRC) error in received packet

Checksum (CRC) error in received packet

Either current loop open

Transmission is corrupted (computed checksum doesn’t match transmitted checksum)

Modbus message was truncated or timed out early

Possible wiring, connection, and/or termination issue exists. Analog output is set to 4 to 20 mA and loop is open.

Verify proper grounding of the communications wiring. Refer to section 3.4.5 Connecting One or More MGS-

550s to an MSA Bacharach Controller.

Verify proper communications settings for the network. Refer to section 4.4.5 Modbus Configuration (MB-xx) for more information.

A possible hardware problem may exist. Contact the factory.

Wire pin 3 to 4 or pin 5 to 6 on analog output 4 to 20 mA terminal (see section 3.4.1 Preparations).

Check the integrity of the 4 to 20 mA connections to the interface PCB.

NOTE: If a “last fault” attribute (D-08 or D-10) indicates that a fault has occurred at some point in time, but the corresponding “current fault” attribute (D-07 or D-09) shows no fault, then the problem has self-healed and no service action is required.

Code Critical Fault Possible Causes Remedy

0000 No Fault

Check all connections in the sensing

0001 No sensor signal Cannot detect sensor

0002

0004

0008

0010

0020 Input voltage fault Power supply voltage out of range Call service

0040

Sensor board hardware fault

EEPROM checksum fault

Zero adjust out of range

Span adjustment out of range

Microprocessor fault

Cannot read EEPROM or analog front end

Error reading EEPROM Replace sensor module.

Field zero adjustment exceeds limits Perform zero adjustment

Field span adjustment exceeds limits Perform span adjustment

MPU clock fault Call service

head.

Check connections to the interface board. Check all connections in the sensing

head.

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5 Maintenance

Code Critical Fault Possible Causes Remedy

0080 Software fault Firmware error

0100

0200

RS485 receiver fault

RS485 checksum fault

0400 Modbus fault

0800

1000

Temperature sensor fault

Temperature out of range fault

Receiver buffer full (message too long to receive buffer)

Checksum error in received packet

Packet timeout. Modbus message truncated or timed out early

Temperature sensor disconnected or no valid reading

Temperature out of range

Analog front end

2000

communications

EC analog front end failure Replace sensor module

fault

4000

8000

Negative gas concentration fault

Sensor configuration fault

Sensor has drifted too negative Perform zero and span calibration

General error in sensor configuration Replace sensor module

Power-cycle. If it re-occurs then call service

Check connection to sensor PCB

Confirm that sensing head is operating within specifications

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5 Maintenance

5.4 Sensor Maintenance

5.4.1 Components Overview

CAUTION!

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.

Failure to follow this caution can result in minor or moderate injury.

NOTE: If the instrument has two sensors installed, and both sensors, modules or heads should be replaced, then

replace and register them one at a time. Failing to do so might cause a fault. Observe the sensor type (target gas, measuring range) and replace the sensor with the same type.

If sensors should be replaced with different types, be sure to de-register the sensor(s) first, and then register them one at a time. Refer to the following sections:

4.3.8 De-register All Sensors and Reset Node Address (F-08)

4.3.7 De-register One Sensor (F-07)

4.3.6 Register Sensor (F-06)

Item Description Replacement Instructions

1 Sensor cable See figure above 2 Sensor connector See figure above 3 Sensing head base See figure above 4 O-ring See figure above 5 Sensor control board 5.4.3 Replacing the Sensor Control Board 6 Sensor module (sensor plus PCB) 5.4.2 Replacing the Sensor Module 7 Optional spacer See figure above (used with SC combustible and SC VOC sensors) 8 Foam sensor gasket See figure above

9 Sensing head cap See figure above 10 Permeable membrane See figure above 11 Lock nut (M40 X 1.5) See figure above 12 Splash guard See figure above

1-12 Entire Assy (Local) 5.4.4 Replacing the Local Sensing Head Assembly 1-12 Entire Assy (Remote) 5.4.6 Replacing the Remote Sensing Head Assembly

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5 Maintenance

5.4.2 Replacing the Sensor Module

See illustration in 5.4.1 Components Overview.

1. Power down the instrument.

2. Unscrew M40 locknut (item 10).

3. Pull sensor cap (item 9) down.

4. Remove sensor spacer (optional on certain sensors) if it is in place.

5. Remove foam gasket (item 8) if it is adhered to the sensor module.

6. Remove the sensor module (item 6) from sensor control board (item 5).

7. With flat edges of PCBs aligned, plug new sensor module into sensor control board.

8. Ensure that the spacer (optional item 7 on certain sensors), is in place (if applicable).

9. Ensure that the round foam gasket is in place and not deformed.

10. Slide the sensing head cap back on the sensing head base.

11. Ensure that O-Ring (item 4) is in place.

12. Screw locknut back on until it clicks three times (hand tight) while compressing the sensor cap against the base.

13. Power-up the instrument.

14. Verify calibration.

5.4.3 Replacing the Sensor Control Board

See illustration in section 5.4.1 Components Overview.

1. Power down the instrument.

2. Unscrew M40 locknut (item 10).

3. Pull sensor cap (item 8) down.

4. Remove sensor spacer (optional on certain sensors) , if it is in place (if applicable).

5. Remove foam gasket (item 7) if it is adhered to the sensor module.

6. Pull out sensor and PCB stack (items 5 and 6) from the sensing head base (item 3).

7. Remove sensor control board (item 5) from sensor module (item 6).

8. With flat edges of PCBs aligned, plug new sensor module into sensor control board.

9. Plug PCB stack with sensor back into sensing head base.

10. Ensure that the spacer (optional on certain sensors) is in place (if applicable).

11. Ensure that the round foam gasket is in place and not deformed.

12. Slide the sensing head cap back on the sensing head base.

13. Ensure that O-Ring (item 4) is in place.

14. Screw locknut back on until it clicks three times (hand tight) while compressing the sensor cap against the base.

15. Power-up the instrument. Replacing the sensor control board requires sensor registration. See section 4.3.6 Register Sensor (F-06).

16. Verify calibration.

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5.4.4 Replacing the Local Sensing Head Assembly

See illustration in section 5.4.1 Components Overview.

1. Deregister the old sensor (see section 4.3.7 De-

2. Power down the instrument.

3. Loosen the six screws of the lid using an M5 hex key and remove the lid.

4. Unplug the old sensing head.

5. Unscrew the old sensing head.

6. Screw sensing head with attached gasket into the housing and tighten (maintain IP rating).

7. Plug new sensing head connector into socket.

8. Place bezel back into the enclosure and secure with the three screws to the standoffs.

9. Put lid back on and tighten the six screws.

10. Power-up instrument.

11. The instrument will prompt to start the sensor registration (e.g., “rEg 1”). Acknowledge with [ENTER]. The instrument will then indicate successful registration (e.g., “PASS 1”).

5 Maintenance

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5 Maintenance

5.4.5 Adding a Second Sensor

1. Power down the instrument.

2. Open the housing. Loosen the six screws of the lid using an M5 hex key and remove the lid.

3. Remove an unused plug from the enclosure, if necessary.

4. Feed the connector end of the sensor assembly into the enclosure.

Screw cable gland with attached gasket into the housing and tighten (maintain IP rating).

6. Plug the new sensing head connector into the open sensor connector socket on the interface board.

7. Place the bezel back into the enclosure and secure with the three screws to the standoffs.

8. Replace the enclosure lid as appropriate.

9. Power-up the instrument.

10.

The instrument will prompt to start the sensor registration (e.g., “rEg 2”). Acknowledge with [ENTER]. The instrument will then indicate successful registration (e.g., “PASS 2”).

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5.4.6 Replacing the Remote Sensing Head Assembly

See illustration in section 5.4.1 Components Overview.

1. Power down the instrument.

2. Loosen the six screws of the lid using an M5 hex key and remove the lid.

3. Unplug the old sensing head.

4. Unscrew cable gland of old sensing head and remove.

5. Screw cable gland into the housing and tighten (maintain IP rating).

6. Plug new sensing head connector into socket.

7. Place bezel back into the enclosure and secure with the three screws to the standoffs.

8. Put lid back on and tighten the six screws.

9. Power-up instrument.

10. The instrument will prompt to start the sensor registration (e.g., “rEg 1”). Acknowledge with [ENTER]. The instrument will then indicate successful registration (e.g., “PASS 1”).

5 Maintenance

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5 Maintenance

5.5 Replacing the Instrument Electronics

CAUTION!

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.

Failure to follow this caution can result in minor or moderate injury.

1. The user should note parameters, settings such as alarm setpoints, relay configurations, etc., as the unit will have factory settings after replacement of the processor board.

2. Power down the instrument.

3. Remove the housing lid.

Loosen the six screws of the lid using an M5 hex key and remove the lid.

4. Unplug ribbon cable from Interface Board.

5. Attach bezel to new Processor Board.

6. Plug ribbon cable of new Processor Board into socket of Interface Board.

7. Place bezel (and attached Processor Board) back into the enclosure and secure with the three screws to the standoffs.

8. Power-up instrument.

9. Register the sensor(s) (both sequentially, if applicable). See section 4.3.6 Register Sensor (F-06).

10.Place bezel back into the enclosure and secure with the three screws to the standoffs.

11.Replace the housing lid (maintain IP rating). Tighten the six screws of the lid using an M5 hex key.

12.Check settings of the parameters (see section 4.4 Parameters), perform an instrument test (see section 4.3.4

Instrument Test (F-04)), and check calibration (see section 5.2.4 Span Adjustment).

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5 Maintenance

5.6 Replacing the Interface Board

CAUTION!

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.

Failure to follow this caution can result in minor or moderate injury.

1. Power down the instrument.

2. Remove the housing lid. Loosen the six screws of the lid using an M5 hex key and remove the lid.

3. Unplug ribbon cable from Interface Board.

4. Label all connected wires, then disconnect all interface board wiring.

5. Using a #4 Torx head screwdriver or Torx key, loosen the screws that hold the Interface Board in place. Remove the Interface Board from the enclosure.

6. Replace the old Interface Board with the new one.

7. Secure the Interface Board to the enclosure by reversing the previous removal procedure.

8. With the Interface Board in place, re-attach the wiring using the labels from the earlier step.

9. Replace the housing lid. Tighten the six screws of the lid using an M5 hex key.

10.Power up the instrument and verify proper operation.

11.Register sensors. See section 4.3.6 Register Sensor (F-06).

5.7 Cleaning the Instrument

Clean the instrument with a soft cloth using water and a mild detergent. Rinse with water.

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6 Factory Default Settings

Parameter Name Factory Default Changed To

S1-01 Sensor 1 Gas Name Sensor dependent S1-02 Sensor 1 UID 5-digits, alphanumeric S1-03 Sensor 1 Low Alarm ppb/ppm/%LEL/Vol% Sensor dependent

S1-04

S1-05 Sensor 1 High Alarm ppb/ppm/%LEL/Vol% Sensor dependent

S1-06 Sensor 1 Low Alarm Behavior

S1-07 Sensor 1 Medium Alarm Behavior 3 = latching, not acknowledgeable S1-08 Sensor 1 High Alarm Behavior 3 = latching, not acknowledgeable S1-09 Sensor 1 Type Code 4-digit, alphanumeric S1-10 Sensor 1 Units Sensor dependent S1-11 Sensor 1 Full Scale Sensor dependent S1-12 Sensor 1 Test Flag 0 = sensor OK S2-01 Sensor 2 Gas Name Sensor dependent S2-02 Sensor 2 UID 5-digits, alphanumeric S2-03 Sensor 2 Low Alarm ppb/ppm/%LEL/Vol% Sensor dependent

S2-04

S2-05 Sensor 2 High Alarm ppb/ppm/%LEL/Vol% Sensor dependent

S2-06 Sensor 2 Low Alarm Behavior

S2-07 Sensor 2 Medium Alarm Behavior 3 = latching, not acknowledgeable S2-08 Sensor 2 High Alarm Behavior 3 = latching, not acknowledgeable S2-09 Sensor 2 Type Code 4-digit, alphanumeric S2-10 Sensor 2 Units Sensor dependent S2-11 Sensor 2 Full Scale Sensor dependent S2-12 Sensor 2 Test Flag 0 = sensor OK R1-01 Relay 1 Contact Behavior / Failsafe 0 = normally open R1-02 Relay 1 Source 1-Sensor system = 01 R2-01 Relay 2 Contact Behavior / Failsafe 0 = normally open R2-02 Relay 2 Source 1-Sensor system = 02 R3-01 Relay 3 Contact Behavior / Failsafe 0 = normally open

R3-02 Relay 3 Source 1-Sensor system = 04 AF-01 Alarm ON Delay Value 00 = no delay AF-02 Alarm OFF Delay Value 00 = no delay AF-03 Critical Fault Latching 1 = latching AF-04 Alarm Acknowledge Timeout 59 minutes

A1-01 Analog Output 1 Source 1 = Sensor 1

A1-02 Analog Output 1 Type 4 = 4 – 20 mA

Sensor 1 Medium Alarm ppb/ppm/%LEL/Vol%

Sensor 2 Medium Alarm ppb/ppm/%LEL/Vol%

Sensor dependent

2 = non-latching, acknowledgeable

Sensor dependent

2 = non-latching, acknowledgeable

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7 Sensor Principle

Parameter Name Factory Default Changed To

A1-03 Analog Output 1 Scaling 100% = full scale A1-04 Analog Output 1 Offset 0 = no offset A2-01 Analog Output 2 Source 1 = Sensor 1 A2-02 Analog Output 2 Type 4 = 4 – 20 mA A2-03 Analog Output 2 Scaling 100% = full scale

A2-04 Analog Output 2 Offset 0 = no offset MB-01 Modbus Node Address 001 MB-02 RS-485 Baud Rate 0 = 9600 MB-03 RS-485 Stop Bits 1 MB-04 RS-485 Parity 0 = None MB-05 Modbus slave termination 0 = Out

P1-01 Display Mode 1 = On

B1-01 Buzzer enable and source

14 = any alarm or sensor fault or critical instrument fault

7 Sensor Principle

7.1 Electrochemical Sensors

Electrochemical sensors measure the partial pressure of gases under atmospheric conditions. The monitored ambient air diffuses through a membrane into the liquid electrolyte in the sensor. The electrolyte contains a measuring electrode, a counter-electrode and a reference electrode. An electronic “potentiostat” circuit ensures a constant electrical voltage between measuring electrode and reference electrode. Voltage, electrolyte, and electrode material are selected to suit the gas being monitored so that it is transformed electrochemically on the measuring electrode and a current flows through the sensor. This current is proportional to the gas concentration. At the same time, oxygen from the ambient air reacts at the counter electrode electrochemically. The current flowing through the sensor is amplified electronically, digitized and corrected for several parameters (e.g., the ambient temperature).

7.2 Catalytic Bead Sensors

A catalytic bead sensor measures the partial pressure of combustible gases and vapors in ambient air. It uses the heatof-combustion principle.

The monitored air diffuses through the sintered metal disc into the sensor. The mixture of combustible gases, vapors, and air are catalytically combusted at a heated detector element (called a pellistor). The oxygen content in the air must be greater than 12 Vol%. Due to the resulting heat-of-combustion, the temperature of the detector element rises. This increase in temperature causes a change of resistance in the detector element, which is proportional to the concentration of the mixture of combustible gases and vapors in the monitored air. In addition to the catalytically active detector element, there is a compensator element. Both elements are parts of a Wheatstone bridge. Thus environmental effects like changes in ambient temperature or humidity are almost entirely compensated.

Certain substances in the atmosphere to be monitored may impair the sensitivity of the sensors. Such substances include, but are not limited to:

Polymerizing substances such as acrylonitrile, butadiene and styrene,

Corrosive compounds such as halogenated hydrocarbons (releasing halogens such as bromine, chlorine or fluorine when oxidized) and halogen hydride acids as well as acidic gaseous compounds such as sulfur dioxide and nitrogen oxides,

Catalyst poisons such as sulfurous and phosphorous compounds, silicon compounds (especially silicones), and metal-organic vapors.

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8 Disposing of the Instrument

It may be necessary to check the calibration if the sensor has been exposed for a long time to a high concentration of flammable gases, vapors, or the above-mentioned contaminating substances.

7.3 Semiconductor Sensors

Semiconductor or metallic oxide sensors (MOSs) are among the most versatile of all broad-range sensors. They can be used to detect a variety of gases and vapors in low ppm or even combustible ranges. The sensor is made up of a mixture of metallic oxides. They are heated to a temperature between 150º and 300º C depending on the gas(es) to be detected. The temperature of operation as well as the “recipe” of mixed oxides determines the sensor selectivity to various toxic gases, vapors, and refrigerants. Electrical conductivity greatly increases as soon as a diffusion process allows the gas or vapor molecules to come in contact with the sensor surface. Water vapor, high ambient humidity, temperature fluctuations, and low oxygen levels can result in higher readings.

Certain substances in the environment to be monitored may impair the sensitivity of the sensors:

Materials containing silicone or silicone rubber/putty

Corrosive gases such as hydrogen sulfide, sulfur oxide, chlorine, hydrogen chloride, etc.

Alkaline metals, salt water spray.

7.4 Infrared Sensors

The infrared (IR) gas sensor is designed to measure the concentration of combustible gases and vapors in the ambient air. The sensor principle is based on the concentration-dependent absorption of infrared radiation in measured gases.

The monitored ambient air diffuses through a sintered metal material into the housing of an optical “bench”. The broadband light emitted by an IR source passes through the gas in the optical bench and is reflected by the walls from where it is directed towards a dual-element detector. One channel of the detector measures the gas-dependent light transmission, while the other channel is used as a reference. The ratio between measurement and reference signal is used to determine the gas concentration. Internal electronics and software calculate the concentration and produce an output signal.

8 Disposing of the Instrument

8.1 Disposing of Electrical and Electronic Equipment

EU-wide regulations governing the disposal of electrical and electronic appliances which have been defined in the EU Directive 2012/19/EU and in national laws have been effective since August 2012 and apply to this device.

Common household appliances can be disposed of using special collecting and recycling facilities. However, this device has not been registered for household usage. Therefore it must not be disposed of through these channels. The device can be returned to your national MSA Bacharach Sales Organization for disposal. Please do not hesitate to contact MSA Bacharach if you have any further questions on this issue.

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9 Technical Data

8.2 Disposing of Electrochemical Sensors

Dispose of sensors in accordance with local laws.

WARNING!

• EXPLOSION DANGER! Do not dispose of sensors in fire due to the risk of explosion and resulting chemical burns.

• Do not force open electrochemical sensors.

• Observe the applicable local waste disposal regulations. For information, consult your local environmental agency, local government offices or appropriate waste disposal companies.

Failure to follow these warnings can result in serious personal injury or death.

9 Technical Data

9.1 General Specifications

Category Specifications

Normal operation: 4 to 20 mA Drift below zero: 3.8 mA Measuring range exceeded: 20.5 mA

Analog Current

Analog Voltage

Signals to Central Controller

Modbus RTU over RS-485

Operating Voltage 19.5 to 28.5 VDC; 24 VAC ± 20%, 50/60 Hz Power Monitoring Green LED Inrush Current 1.5 A Operating current, max. 330 mA at 24 VDC

Power Supply and Relays

Relay rating

Audible alarm Internal Buzzer ≥85 dB at 4” (10 cm); open enclosure Alarm delay 0 to 15 minutes (selectable)

Power and analog signal

Wiring

Modbus network

Instrument fault: ≤ 1.2 mA Fault on analog interface: > 21 mA Offline mode /

Maintenance signal: 0 to 5 V; 1 to 5 V; 0 to 10 V; 2 to 10 V (selectable) During fault condition, 1 to 5 V and 2 to 10 V outputs are 0

V. Baud rate: 9,600 or 19,200 (selectable) Start bits: 1 Data bits: 8

Parity:

Stop bits: 1 or 2 (selectable)

Retry time:

End of message: Silent 3.5 characters

3 SPDT, arbitrary designation

1 A at 24 VAC/VDC, 0.5 A at 125 VAC, resistive load

2-, 3-, 4-, or 6-core shielded cable, 16 to 20 AWG (0.5 to

1.5 mm2) 2-core twisted pair shielded cable 16 to 20 AWG (0.5 to

3 mA steady signal

None, odd, even (selectable)

500 ms, min time between retries

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9 Technical Data

Category Specifications

Cable gland 6 cable glands M16 (4-8 mm) cable outer diameter Enclosure and sensor

housing

Physical Specifications

Environmental

Agency Approvals CE, UL/CSA/IEC/EN 61010-1

Company Certifications

Enclosure protection IP66 Display 5 digit, 7 segment LED Enclosure Size (WxHxD)

(Approx.) Temperature - 40 to 120 ºF (-40 to 50 ºC) Storage temperature - 5 to 100 ºF (-20 to 40 ºC) Humidity 5 to 90 %RH, non-condensing Pressure 20.7 to 38.4 in. of Hg (700 to 1300 hPa) Elevation 0 to 10,000 ft. (3050 m) altitude Sensors See Section 9.2 Sensor Specifications

Influences

USA Certification (for units assembled in USA): MSA Bacharach (USA) is a TÜV-SÜD certified company. Ireland Certification (for units assembled in Ireland): Murco (a Bacharach Company) is an NSAI certified company.

1.5 mm2) with 120 Ohm characteristic impedance

ABS

210x225x85 mm (8.3x8.9x3.1 in)

For influences on the measurement performance and restrictions of a particular sensor see sensor data sheet.

9.2 Sensor Specifications

ECSensors Formula Measure Range(s)

Ammonia NH

Carbon Monoxide CO 0 to 1,000 ppm Chlorine Fluorine Hydrogen H Hydrogen Chloride

HCl 0 to 10 ppm Hydrogen Cyanide HCN 0 to 30 ppm Hydrogen Sulfide H2S 0 to 100 ppm Nitrogen Dioxide NO Oxygen O Ozone

Suflure Dioxide SO

No IPrating

0 to 100, 0 to 1,000, 0 to 5,000 ppm

0 to 10 ppm 0 to 1 ppm 0 to 10,000 ppm

0 to 20 ppm 0 to 30 Vol% 0 to 1 ppm 0 to 10 ppm

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9 Technical Data

IRSensors Formula Measure Range(s)

0 to 5,000 ppm = 0 to 0.5 Vol% 0 to 10,000 ppm = 0 to 1 Vol% 0 to 20,000 ppm = 0 to 2 Vol%

Carbon Dioxide CO

0 to 30,000 ppm = 0 to 3 Vol% 0 to 40,000 ppm = 0 to 4 Vol% 0 to 50,000 ppm = 0 to 5 Vol%

Hydrocarbons (Butane, Methane, and Propane)

C4H

C3H

0 to 100 %LEL 0 to 100 %LEL 0 to 100 %LEL

CATSensors Formula Measuring Range

Combustible Gasses (including Ammonia)

Various 0 to 100 %LEL

SCSensors Typical ExampleGases Measure Range

HFCs R134a, R404A, R407C, R410A, R507 0 to 1,000, 0 to 10,000 ppm

R22 0 to 1,000, 0 to 10,000 ppm

HCFCs and HFOs

R1234YF 0 to 1,000 ppm R1234ZE 0 to 1,000, 0 to 10,000 ppm R-448a, R-449a, R-452a, R-513a 0 to 1,000 ppm

Hydrocarbons

Methane (Natural gas), Propane, Butane, Iso-Butane, Ethylene

Ammonia NH Hydrogen H

0 to 5,000 ppm

(SC Ethylene is 0 to 2,000 ppm) 0 to 10,000 ppm 0 to 5,000 ppm

Acetone, Chloroform, Ethanol,

VOCs

Methanol, Methylene Chloride,

0 to 1,000 ppm

Ethylene Chloride

9.3 Modbus Registers

NOTE: If items span two registers (e.g., 30024 and 30025), then the registers are “long” or “float” data types. Otherwise

the registers are integer data types or ASCII.

NOTE: If a sensor is not registered, then reading from a Modbus register associated with that sensor will generate a Modbus exception.

9.3.1 Analog Input Registers

Analog input registers are read only and use Modbus function code 04 (Read Input Register).

Reg Description Range Units Param

30001 16-bit Current Fault Code Instrument electronics

30002 16-bit Last Fault Code Instrument electronics - D-02

30003 Software Version Instrument electronics - - 30004

Reserved - - -

See 5.3.4 Non-Critical

(E300) Faults and 5.3.3 Instrument Electronics Critical (E100) Faults

- D-01

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9 Technical Data

Reg Description Range Units Param

30010 30011 Sensor 1 Type Code - - S1-09

1 = ppm

30012 Display units sensor 1

- S1-10

3 = Vol%

4 = %LEL

Full Scale in ppb, ppm, %LEL or Vol% Sensor 1 (Note: %

2 = ppb

30013

LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is

0 to 65535

Unit dependent

S1-11

"20.5%".)

30014 Sensor 1 Gas Type Text Char 1, 2 0 to 9; a to z ASCII Text

S1-0130015 Sensor 1 Gas Type Text Char 3, 4 0 to 9; a to z ASCII Text

30016 Sensor 1 Gas Type Text Char 5, NULL 0 to 9; a to z ASCII Text

30017

%LEL/Vol% Conversion Factor * 10 Sensor 1. This is the factor to convert the integer gas output level from %LEL or Vol% to ppm.

0 to 65535

Unit dependent

30018 Alarm Low Set-Point Sensor 1 0 to 100 % Full scale S1-03 30019 Alarm Medium Set-Point Sensor 1 0 to 100 % Full scale S1-04 30020 Alarm High Set-Point Sensor 1 0 to 100 % Full scale S1-05

Concentration ppb, ppm, %LEL or Vol% Sensor 1 (Note:

30021

% LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is

0 to 65535

Unit dependent

"20.5%".) Units are in register 30012.

30022 Concentration Sensor 1 0 to 100

% Full Scale

30023 Sensor timer Sensor 1 0 to 65535 Hours -

30024 ppm Hours Sensor 1 (upper long integer)

ppm Hours

30025 ppm Hours Sensor 1 (lower long integer)

Temperature Deg C Sensor 1

30026

-40 to +80 °C -

NOTE: Sensor PCB temp, not gas temp 30027 16 bit Fault Code Sensor 1 See 5.3.5 Sensor Faults - D-07 30028 Sensor 1 Instrument electronics UID Char 1,2 0 to 9; a to z ASCII Text

S1-0230029 Sensor 1 Instrument electronics UID Char 3,4 0 to 9; a to z ASCII Text 30030 Sensor 1 Instrument electronics UID Char 5,NULL 0 to 9; a to z ASCII Text 30031 Sensor 2 Type Code - - S2-09

1 = ppm

2 = ppb

30032 Display units Sensor 2

- S2-10

3 = Vol%

4 = %LEL

30033

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Full Scale in ppb, ppm, %LEL or Vol% Sensor 2. (Note:

0 to 65535

Unit

S2-11

Page 53

9 Technical Data

Reg Description Range Units Param

% LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is "20.5%".)

30034 Sensor 2 Gas Type Text Char 1,2 0 to 9; a to z ASCII Text

30036 Sensor 2 Gas Type Text Char 5,NULL 0 to 9; a to z ASCII Text

%LEL/Vol% Conversion Factor * 10 Sensor 2. This is the

30037

30038 Alarm Low Set-Point Sensor 2 30039 Alarm Medium Set-Point Sensor 2 30040 Alarm High Set-Point Sensor 2 -

30041

30042 Concentration Sensor 2 0 to 100

30043 Sensor timer Sensor 2 0 to 65535 Hours 30044 ppm Hours Sensor 2 (upper long integer) 30045 ppm Hours Sensor 2 (lower long integer) 30046 Temperature Deg C Sensor 2 -40 to +80 °C 30047 16-bit Fault Code Sensor 2 See 5.3.5 Sensor Faults - D-09 30048 Sensor 2 Instrument electronics UID Char 1,2 0 to 9; a to z ASCII Text

30050 Sensor 2 Instrument electronics UID Char 5,NULL 0 to 9; a to z ASCII Text 30051 Sensor 1 Module SID Char 1,2 0 to 9; a to z ASCII Text

30053 Sensor 1 Module SID Char 5,NULL 0 to 9; a to z ASCII Text 30054 Sensor 2 Module SID Char 1,2 0 to 9; a to z ASCII Text 30055 Sensor 2 Module SID Char 3,4 0 to 9; a to z ASCII Text 30056 Sensor 2 Module SID Char 5,NULL 0 to 9; a to z ASCII Text

factor to convert the integer gas output level from %LEL or Vol% to ppm.

Concentration ppb, ppm, %LEL or Vol% Sensor 2. (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is "20.5%".)

0 to 65535

0 to 100 % Full scale

0 to 65535

- ppm Hours -

dependent

Unit dependent

% Full Scale

S2-0130035 Sensor 2 Gas Type Text Char 3,4 0 to 9; a to z ASCII Text

S2-0230049 Sensor 2 Instrument electronics UID Char 3,4 0 to 9; a to z ASCII Text

-30052 Sensor 1 Module SID Char 3,4 0 to 9; a to z ASCII Text

9.3.2 Analog Output Registers

Analog output registers are readable (using function code 03) and writable (using function code 06).

Reg Description Range Units Param

40001 Display Mode 0=Off, 1=On - P1-01 40002 RS-485 Node Address 1 to 250 - MB-01 40003 Baud Rate 0=9600, 1=19200 - MB-02 40004 Stop Bits 1 or 2 - MB-03 40005 Parity 0=None, 1=Odd, 2=Even - MB-04 40006 Alarm Delay ON Value 00 to 15 Minutes AF-01

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Reg Description Range Units Param

40007 Alarm Delay OFF Value 00 to 15 Minutes AF-02 40008 Controller UID Char 1,2 0 to 9; a to z ASCII Text 40009 Controller UID Char 3,4 0 to 9; a to z ASCII Text 40010 Controller UID Char 5,NULL 0 to 9; a to z ASCII Text

Sensor 1 Low Alarm ppb, ppm, %LEL or Vol%. (Note:

40011

% LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is

0 to sensor full scale

"20.5%".) Sensor 1 Med Alarm ppb, ppm, %LEL or Vol%. (Note:

40012

% LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is

0 to sensor full scale

"20.5%".) Sensor 1 High Alarm ppb, ppm, %LEL or Vol%. (Note:

40013

% LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is

0 to sensor full scale

"20.5%".) 40014 Sensor 1 Low Alarm Behavior S1-06 40015 Sensor 1 Medium Behavior S1-07 40016 Sensor 1 High Behavior S1-08

Sensor 2 Low Alarm ppb, ppm, %LEL or Vol%. (Note:

40017

% LEL and Vol% sensors are always displayed as “x

10” the actual value. For example, a reading of "205" is

0 to sensor full scale

"20.5%".)

Sensor 2 Med Alarm ppb, ppm, %LEL or Vol%. (Note:

40018

% LEL and Vol% sensors are always displayed as “x

10” the actual value. For example, a reading of "205" is

0 to sensor full scale

"20.5%".)

Sensor 2 High Alarm ppb, ppm, %LEL or Vol%. (Note:

40019

% LEL and Vol% sensors are always displayed as “x

10” the actual value. For example, a reading of "205" is

0 to sensor full scale

"20.5%".) 40020 Sensor 2 Low Alarm Behavior S2-06 40021 Sensor 2 Medium Behavior S2-07 40022 Sensor 2 High Behavior S2-08

Unit dependent

S1-03

S1-04

S1-05

S2-03

S2-04

S2-05

40023 Analog Output 1 Source

- A1-01

2 = Sensor 2

0 = 0 to 5 V

1 = 1 to 5

1 = Sensor 1

40024 Analog Output 1 Type

2 = 0 to 10 V

- A1-02

3 = 2 to 10 V

4 = 4 to 20 mA

40025 Analog Output 1 Scaling 20% to 100% of full scale % A1-03

40026 Analog Output 1 Offset

±410 (can take an output below zero)

410 = 10% of full scale

A1-04

40027 Analog Output 1 Full Scale PPM

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9 Technical Data

Reg Description Range Units Param

40028 Analog Output 2 Source

- A2-01

2 = Sensor 2

0 = 0 to 5 V

1 = 1 to 5

1 = Sensor 1

40029 Analog Output 2 Type

2 = 0 to 10 V

- A2-02

3 = 2 to 10 V

4 = 4 to 20 mA

40030 Analog Output 2 Scaling 20% to 100% of full scale % A2-03

40031 Analog Output 2 Offset

±410 (can take an output below zero)

410 = 10% of full scale

A2-04

40032 Analog Output 2 Full Scale PPM

0 = NO

40033 Relay 1 Contact Behavior/Failsafe

- R1-01

1 = Failsafe

0 = NO

40034 Relay 2 Contact Behavior/Failsafe

- R2-01

1 = Failsafe

0 = NO

40035 Relay 3 Contact Behavior/Failsafe

- R3-01

1 = Failsafe 40036 Relay 1 Source 40037 Relay 2 Source - R2-01

4.4.2 Relay Designation

(RX-xx)

- R1-02

40038 Relay 3 Source - R3-01 40039 Buzzer enable and source 40040 Critical Fault Latch AF-03

4.4.7 Buzzer Designation

(B1-xx)

B1-01

5.3.4 Non-Critical (E300)

40041 Instrument electronics fault code

Faults and 5.3.3

Instrument Electronics

- D-01

Critical (E100) Faults

5.3.4 Non-Critical (E300)

40042 Instrument electronics last fault

Faults and 5.3.3

Instrument Electronics

- D-02

Critical (E100) Faults

40043 Power supply voltage

15.5-28.5 VDC or 24 VAC

±20%

Volt D-04

40044 Hours since last test sensor 1 Hours D-05 40045 Hours since last test sensor 2 Hours D-06 40046 Reserved 40047 Instrument electronics 12V supply voltage x100 40048 Instrument electronics 6V supply voltage x100 40049 Instrument electronics 5.4V supply voltage x100 40050 Instrument electronics 3.3V supply voltage x100 40051 Instrument electronics temperature x100 40052 Instrument electronics tact and magnetic switch state

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9.3.3 Input Status Flags

Input status flags are readable (using function code 02).

Reg Description Range

10001 Sensor 1 Low Alarm Flag 0 or 1 = alarm 10002 Sensor 1 Medium Alarm Flag 0 or 1 = alarm 10003 Sensor 1 High Alarm Flag 0 or 1 = alarm 10004 Sensor 1 Fault 0 or 1 = fault 10005 Sensor 1 Saturation Overflow 0 or 1 = gas > full scale 10006 Sensor 1 Saturation Underflow 0 or 1 = gas < 0 10007 Sensor 1 Start-up 0 or 1 = start-up 10008 - 10010 Reserved 10011 Sensor 2 Low Alarm Flag 0 or 1 = alarm 10012 Sensor 2 Medium Alarm Flag 0 or 1 = alarm 10013 Sensor 2 High Alarm Flag 0 or 1 = alarm 10014 Sensor 2 Fault 0 or 1 = fault 10015 Sensor 2 Saturation Overflow 0 or 1 = gas > full scale 10016 Sensor 2 Saturation Underflow 0 or 1 = gas < 0 10017 Sensor 2 Start-up 0 or 1 = start-up 10018 - 10020 Reserved 10021 Relay 1 State 0 or 1 = energized 10022 Relay 2 State 0 or 1 = energized 10023 Relay 3 State 0 or 1 = energized 10024 Instrument Electronics Offline 0 or 1 = offline 10025 Instrument Electronics Non-Critical Fault 0 or 1 = fault 10026 Instrument Electronics Critical Fault 0 or 1 = fault

NOTE: A sensor must be re-zeroed if it shows underflow saturation.

9.3.4 Output Status Flags

Output status flags are readable using Modbus function code 01 and writable using function code 05.

Reg Description Range

00001

00002

00003 Alarm Flag (0 or 1 = alarm) for any alarm (not fault).

00004

00005

00006

Sensor 1 calibration expired. This flag can be cleared by performing a calibration or by resetting.

Sensor 2 calibration expired. This flag can be cleared by performing a calibration or by resetting.

Writing zero clears any acknowledgeable or latched alarm. This is the same behavior as holding the ENTER key for 5 seconds.

Relay closed test. Setting this flag to zero closes all 3 relays simultaneously for 5 seconds. At the end of the test the relays revert to their normal operation.

Relay opened test. Setting this flag to zero opens all 3 relays simultaneously for 5 seconds. At

0 or 1 = need calibration

0 or 1 = alarm

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Reg Description Range

the end of the test the relays revert to their normal operation Analog Output Zero Test. Setting this to one drives the analog outputs to their minimum value.

This depends on the configuration of the analog output.

00007

For 4-20mA it will drive 4mA

For all voltage ranges it will drive 0V

0 or 1 = test in process

During the test the Modbus flag will remain ON. When the test is completed the flag will turn OFF

Display Test Mode. Setting this sets all 7-segment display segments, power LED and both units LEDs active simultaneously for 5 seconds. At the end the display will revert to normal

00008

operation.

0 or 1 = test in process

During the test the Modbus flag will remain ON. When the test is completed the flag will turn OFF. This test is only operative outside the menus.

10 Ordering Information

10.1 MGS-550 Instrument Only

NOTE: In the descriptions below, "MGS-550 Gas Detector" includes an instrument and one sensing head mounted

directly to the instrument housing. Remote or secondary local sensors must be ordered as separate items.

P/N MGS-550 Instrument Only

6600-8000 MGS-550 Instrument ONLY, IP66 (For remote sensor applications, order sensing heads below)

10.2 MGS-550 Gas Detector, IP66 with IP66 Sensor

P/N MGS-550 Gas Detector, IP66 with IP66 Sensor Installed at the Factory

6600-8010 MGS-550 Gas Detector, IP66, IR, CO2, 0-5000 ppm 6600-8011 MGS-550 Gas Detector, IP66, IR, CO2, 0-10000 ppm 6600-8012 MGS-550 Gas Detector, IP66, IR, CO2, 0-20000 ppm 6600-8013 MGS-550 Gas Detector, IP66, IR, CO2, 0-30000 ppm 6600-8014 MGS-550 Gas Detector, IP66, IR, CO2, 0-40000 ppm 6600-8015 MGS-550 Gas Detector, IP66, IR, CO2, 0-50000 ppm 6600-8016 MGS-550 Gas Detector, IP66, IR, Butane, 0-100 %LEL 6600-8017 MGS-550 Gas Detector, IP66, IR, Methane, 0-100 %LEL 6600-8018 MGS-550 Gas Detector, IP66, IR, Propane, 0-100 %LEL 6600-8019 MGS-550 Gas Detector, IP66, EC, NH3, 0-100 ppm 6600-8020 MGS-550 Gas Detector, IP66, EC, NH3, 0-1000 ppm 6600-8021 MGS-550 Gas Detector, IP66, EC, NH3, 0-5000 ppm 6600-8023 MGS-550 Gas Detector, IP66, EC, CO, 0-1000 ppm 6600-8024 MGS-550 Gas Detector, IP66, EC, NO2, 0-20 ppm 6600-8025 MGS-550 Gas Detector, IP66, EC, O2, 0-30 Vol% 6600-8026 MGS-550 Gas Detector, no IP rating, EC, Cl2, 0-10 ppm 6600-8027 MGS-550 Gas Detector, no IP rating, EC, F2, 0-1 ppm 6600-8028 MGS-550 Gas Detector, no IP rating, EC, O3, 0-1 ppm 6600-8029 MGS-550 Gas Detector, IP66, EC, SO2, 0-10 ppm

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P/N MGS-550 Gas Detector, IP66 with IP66 Sensor Installed at the Factory

6600-8030 MGS-550 Gas Detector, IP66, EC, H2S, 0-200 ppm 6600-8031 MGS-550 Gas Detector, no IP rating, EC, HCl, 0-10 ppm 6600-8032 MGS-550 Gas Detector, IP66, EC, HCN, 0-30 ppm 6600-8033 MGS-550 Gas Detector, IP66, EC, H2, 0-10000 ppm 6600-8034 MGS-550 Gas Detector, IP66, CT, NH3, 0-100 %LEL 6600-8035 MGS-550 Gas Detector, IP66, CT, LPG, 0-100 %LEL 6600-8036 MGS-550 Gas Detector, IP66, CT, Methane, 0-100 %LEL 6600-8038 MGS-550 Gas Detector, IP66, CT, Propane, 0-100 %LEL 6600-8039 MGS-550 Gas Detector, IP66, CT, Butane, 0-100 %LEL 6600-8040 MGS-550 Gas Detector, IP66, SC, R22, 0-1000 ppm 6600-8041 MGS-550 Gas Detector, IP66, SC, R32, 0-1000 ppm 6600-8042 MGS-550 Gas Detector, IP66, SC, R134a, 0-1000 ppm 6600-8043 MGS-550 Gas Detector, IP66, SC, R404a, 0-1000 ppm 6600-8044 MGS-550 Gas Detector, IP66, SC, R407a, 0-1000 ppm 6600-8045 MGS-550 Gas Detector, IP66, SC, R407c, 0-1000 ppm 6600-8046 MGS-550 Gas Detector, IP66, SC, R407f, 0-1000 ppm 6600-8047 MGS-550 Gas Detector, IP66, SC, R410a, 0-1000 ppm 6600-8048 MGS-550 Gas Detector, IP66, SC, R422, 0-1000 ppm 6600-8049 MGS-550 Gas Detector, IP66, SC, R422d, 0-1000 ppm 6600-8050 MGS-550 Gas Detector, IP66, SC, R427a, 0-1000 ppm 6600-8051 MGS-550 Gas Detector, IP66, SC, R507, 0-1000 ppm 6600-8052 MGS-550 Gas Detector, IP66, SC, HFO1234YF, 0-1000 ppm 6600-8053 MGS-550 Gas Detector, IP66, SC, HFO1234ZE, 0-1000 ppm 6600-8054 MGS-550 Gas Detector, IP66, SC, R22, 0-10000 ppm 6600-8055 MGS-550 Gas Detector, IP66, SC, R32, 0-10000 ppm 6600-8056 MGS-550 Gas Detector, IP66, SC, R134a, 0-10000 ppm 6600-8057 MGS-550 Gas Detector, IP66, SC, R404a, 0-10000 ppm 6600-8058 MGS-550 Gas Detector, IP66, SC, R407a, 0-10000 ppm 6600-8059 MGS-550 Gas Detector, IP66, SC, R407c, 0-10000 ppm 6600-8060 MGS-550 Gas Detector, IP66, SC, R407f, 0-10000 ppm 6600-8061 MGS-550 Gas Detector, IP66, SC, R410a, 0-10000 ppm 6600-8062 MGS-550 Gas Detector, IP66, SC, R422, 0-10000 ppm 6600-8063 MGS-550 Gas Detector, IP66, SC, R422d, 0-10000 ppm 6600-8065 MGS-550 Gas Detector, IP66, SC, R507, 0-10000 ppm 6600-8067 MGS-550 Gas Detector, IP66, SC, HFO1234ZE, 0-10000 ppm 6600-8069 MGS-550 Gas Detector, IP66, SC, NH3, 0-10000 ppm 6600-8070 MGS-550 Gas Detector, IP66, SC, R290, 0-5000 ppm 6600-8071 MGS-550 Gas Detector, IP66, SC, R600, 0-5000 ppm 6600-8072 MGS-550 Gas Detector, IP66, SC, H2, 0-5000 ppm 6600-8073 MGS-550 Gas Detector, IP66, SC, CH4, 0-5000 ppm 6600-8074 MGS-550 Gas Detector, IP66, SC, VOC/Ethanol, 0-1000 ppm

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10 Ordering Information

P/N MGS-550 Gas Detector, IP66 with IP66 Sensor Installed at the Factory

6600-8075 MGS-550 Gas Detector, IP66, SC, Ethylene, 0-2000 ppm 6600-8076 MGS-550 Gas Detector, IP66, SC, R-448a, 0-1,000 ppm 6600-8077 MGS-550 Gas Detector, IP66, SC, R-449a, 0-1,000 ppm 6600-8078 MGS-550 Gas Detector, IP66, SC, R-452a, 0-1,000 ppm 6600-8079 MGS-550 Gas Detector, IP66, SC, R-513a, 0-1,000 ppm

10.3 MGS-550 5m Remote and Second Sensing Heads

NOTE: Below is the MGS-550 Sensing Head Part Number Configurator. Part number format is: 6600-8ABC.

NOTE: All 5m remote and second, directly mounted sensing heads must be ordered separately.

Code "A"

1 IP66 Sensing Head: 5 meter cable, for remote sensor applications 8 IP66 Sensing Head: For mounting directly to MGS-550 instrument

IP66 Sensing Head Cable Type "A" Select the Required Cable Length, Noting the "A" Code

Codes "B &C"Sensing Head Target Gas and Range "B & C" Select the Target Gas and Range, Noting

the "B & C" Codes

10 IR, CO2, 0-5000 ppm 11 IR, CO2, 0-10000 ppm 12 IR, CO2, 0-20000 ppm 13 IR, CO2, 0-30000 ppm 14 IR, CO2, 0-40000 ppm 15 IR, CO2, 0-50000 ppm 16 IR, Butane, 0-100 %LEL 17 IR, Methane, 0-100 %LEL 18 IR, Propane, 0-100 %LEL 19 EC, NH3, 0-100 ppm 20 EC, NH3, 0-1000 ppm 21 EC, NH3, 0-5000 ppm 23 EC, CO, 0-500 ppm 24 EC, NO2, 0-20 ppm 25 EC, O2, 0-30 Vol% 34 CT, NH3, 0-100 %LEL 35 CT, LPG, 0-100 %LEL 36 CT, Methane, 0-100 %LEL 38 CT, Propane, 0-100 %LEL 39 CT, Butane, 0-100 %LEL 40 SC, R22, 0-1000 ppm 41 SC, R32, 0-1000 ppm 42 SC, R134a, 0-1000 ppm

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Codes "B &C"Sensing Head Target Gas and Range "B & C" Select the Target Gas and Range, Noting

the "B & C" Codes

43 SC, R404a, 0-1000 ppm 44 SC, R407a, 0-1000 ppm 45 SC, R407c, 0-1000 ppm 46 SC, R407f, 0-1000 ppm 47 SC, R410a, 0-1000 ppm 48 SC, R422, 0-1000 ppm 49 SC, R422d, 0-1000 pm 50 SC, R427a, 0-1000 ppm 51 SC, R507, 0-1000 ppm 52 SC, HFO1234YF, 0-1000 ppm 53 SC, HFO1234ZE, 0-1000 ppm 54 SC, R22, 0-10000 ppm 55 SC, R32, 0-10000 ppm 56 SC, R134a, 0-10000 ppm 57 SC, R404a, 0-10000 ppm 58 SC, R407a, 0-10000 ppm 59 SC, R407c, 0-10000 ppm 60 SC, R407f, 0-10000 ppm 61 SC, R410a, 0-10000 ppm 62 SC, R422, 0-10000 ppm 63 SC, R422d, 0-10000 ppm 65 SC, R507, 0-10000 ppm 67 SC, HFO1234ZE, 0-10000 ppm 69 SC, NH3, 0-10000 ppm 70 SC, R290, 0-5000 ppm 71 SC, R600, 0-5000 ppm 73 SC, CH4, 0-5000 ppm 75 SC, R448a, 0-2000 ppm 76 SC, R-448a, 0-1,000 ppm 77 SC, R-449a, 0-1,000 ppm 78 SC, R-452a, 0-1,000 ppm 79 SC, R-513a, 0-1,000 ppm

10.4 MGS-550 Replacement Parts and Accessories

P/N MGS-550 Replacement Parts and Accessories

6600-8401

6600-8402 Replacement display PCB Assembly, MGS-550 6600-8403 Ribbon Cable, MGS-550. Connects top and bottom PCBs 6600-8404 Accessory Kit, MGS-550. Includes spare cable glands and blanking plugs, gaskets.

60 MGS-550 US

Replacement interface I/O PCB Assembly, MGS-550. Base PCB with terminal blocks for IP66 housing.

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P/N MGS-550 Replacement Parts and Accessories

6600-8405 Sensing Head Common Control PCBA, MGS-550

Sensing Head Front End Kit, MGS-550, IP66. Includes lock nut, nosepiece with membrane, O-ring, sensor foam spacers, and splash guard with calibration port. Also included are gaskets to be used as follows.

Gasket P/N Gasket Thickness Sensor Type Applicable Sensor(s)

EC CO, O2, SO

6600-8406

1100-0031 9.5 mm

1100-0542 6.35 mm IR CO 1100-0030 6.5 mm EC, SC All other sensors

10 Ordering Information

NH3, LPG, Methane, Propane, Butane, Toluene/Xylene/Jet Fuels

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64 MGS-550 US

Bacharach MGS-550 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

1.1 General Safety Statements

1 Safety

1.2 Safe Connection of Electrical Devices

2 Description

2.1 Product Overview

2.2 Key Product Features

2.3 General Overview

3 Installation

2.4 Sensor Styles

3.1 General Information for Installation

3.2 Installation Restrictions

3.3 Mechanical Installation

3.4 Electrical Installation

4 Operation

4.1 Overview of Normal Operation

4.2 Menus

4.3 Functions

4.4 Parameters

5 Maintenance

5.1 Maintenance Intervals

5.2 Making Adjustments to Sensors

5.3 Troubleshooting

5.4 Sensor Maintenance

5.5 Replacing the Instrument Electronics

5.6 Replacing the Interface Board

5.7 Cleaning the Instrument

6 Factory Default Settings

7 Sensor Principle

7.1 Electrochemical Sensors

7.2 Catalytic Bead Sensors

8 Disposing of the Instrument

7.3 Semiconductor Sensors

7.4 Infrared Sensors

8.1 Disposing of Electrical and Electronic Equipment

9 Technical Data

8.2 Disposing of Electrochemical Sensors

9.1 General Specifications

9.2 Sensor Specifications

9.3 Modbus Registers

10 Ordering Information

10.1 MGS-550 Instrument Only

10.2 MGS-550 Gas Detector, IP66 with IP66 Sensor

10.3 MGS-550 5m Remote and Second Sensing Heads

10.4 MGS-550 Replacement Parts and Accessories