Below you will find brief information for Fixed Gas Detector MGS-550. The MGS-550 continuously monitors indoor or outdoor ambient air for toxic and combustible gases, oxygen, and refrigerants. It features a rugged ABS enclosure, multi-function 5-digit LED display, diagnostic/status LEDs, configurable output signal, independently configurable analog outputs, and a redundant sensor mapping option. The instrument can be operated as a stand-alone unit with an integrated alarm relay or connected to a Bacharach monitoring system or a PLC. The MGS-550 is designed to be installed in non-classified, non-hazardous, permanent locations.
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Fixed Gas Detector
User Manual
Installation ● Operation ● Configuration ● Troubleshooting
March 28, 2016
Version 1
Product Leadership
• Training • Service • Reliability
MGS-550 Fixed Gas Detector
WARRANTY POLICY
Bacharach, Inc. 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
Bacharach, Inc. maintains an instrument service facility at the factory. Some Bacharach distributors/agents may also have repair facilities; however, Bacharach assumes no liability for service performed by anyone other than Bacharach personnel. Repairs are warranted for 90 days after date of shipment (sensors, pumps, filters and batteries have individual warranties). Should your instrument require non-warranty repair, you may contact the distributor from whom it was purchased or you may contact Bacharach directly.
If Bacharach is to do the repair work, send the instrument, prepaid, to the closest Service Center.
Service Location
United States
Ireland
Canada
Service Contact Information
http://mybacharach.com/rmaform/
Phone: +1 724 334 5000
Toll Free:
Fax:
Email:
1 800 736 4666
+1 724 334 5001 [email protected]
Phone:
Fax:
Email:
Phone:
Fax:
Email:
+353 1 284 6388
+353 1 284 6389 [email protected]
+1 905 470 8985
+1 905 470 8963 [email protected]
Service Shipping Address
Bacharach, Inc.
621 Hunt Valley Circle
New Kensington, PA 15068, USA
ATTN: Service Department
Murco – A Bacharach Company
114A Georges Street Lower
Dun Laoghaire, Dublin, Ireland
ATTN: Service Department
Bacharach of Canada
20 Amber Street Unit #7
Markham, Ontario L3R 5P4, Canada
ATTN: Service Department
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, Bacharach has a policy of performing all needed repairs to restore the instrument to full operating condition.
Prior to shipping equipment to 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 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 Bacharach, Inc.
All software utilized and/or distributed by 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 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.
© 2016 Bacharach, Inc.
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MGS-550 Fixed Gas Detector
TABLE OF CONTENTS
Connecting One or More MGS-550s to a Bacharach Controller ................................ 17
De-register All Sensors and Reset Node Address (F-08) .......................................... 27
Sensor 1 Settings (S1-xx) and Sensor 2 Settings (S2-xx) if Connected .................... 29
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SECTION 1. SAFETY
1.1 Definition of Alert Icons
The following alert icons are used in this document to highlight areas of the associated text that require a greater awareness by the user.
Alert Icon Description
DANGER
WARNING
CAUTION
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in physical injury or damage to the product or environment. It may also be used to alert against unsafe practices.
NOTICE
Indicates additional information on how to use the product.
1.2 General Safety Statements
• 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
Bacharach or personnel qualified by Bacharach.
• Use only genuine Bacharach spare parts and accessories. Otherwise, operation may be impaired.
• Only operate the product within the framework of a risk-based alarm signaling concept.
1.3 Safe Connection of Electrical Devices
• Before connecting this instrument to electrical devices not mentioned in this manual, consult the manufacturer or a qualified professional.
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SECTION 2. DESCRIPTION
2.1 Product Overview
The 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 one of the following:
• rugged ABS enclosure (general purpose or “GP” housing)
• aluminum enclosure (explosion-proof or “XP” housing).
The instrument can be connected to a Bacharach monitoring system or a Programmable Logic Controller
(PLC). With the integrated alarm relay, 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, nonhazardous, permanent locations.
WARNING
Danger of explosions. This product is neither certified nor approved to be operated in oxygen-enriched atmospheres.
WARNING
The device is not intended to be used in areas classified as hazardous.
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2.2 Key Product Features
• Enclosure options: o
General-purpose (GP): ABS plastic housing (rectangular) o
Explosion-proof (XP): Aluminum housing (round)
• Power options (refer to section 9.1: General Specifications on page 62):
o
24 VAC o
19.5 to 28.5 VDC
• Multi-function, 5-digit LED display o
gas concentrations o
status messages o
menu choices
• Diagnostic/status LEDs (3)
• Configurable output signal (based on measured gas concentration): o
Analog output 4 to 20 mA o
Analog output 0 to 5 V o
Analog output 0 to 10 V o
Analog output 1 to 5 V o
Analog output 2 to 10 V o
Digital output Modbus RTU signal
• Independently configurable analog outputs (2)
• Redundant sensor mapping option (one sensor can be mapped to both analog outputs)
• Multi-wire signal transmission configurations: o
Analog 1 sensor (2-wire) o
Analog 2 sensors (3-wire or 4-wire) o
Digital Modbus communications (2-wire plus ground)
• Menu navigation options: o
Internal buttons to use if the cover is removed o
Non-intrusive magnetic wand to use on external adjustments points on the cover
• Non-intrusive magnetic wand can be used to configure, calibrate, and maintain the device
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2.3 General Purpose Option
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2.4 Explosion Proof Option
MGS-550 Fixed Gas Detector
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2.5 Sensor Styles
For General Purpose (GP) Enclosure For Explosion Proof (XP) Enclosure
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SECTION 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. o
The general purpose enclosure provides four M20 x 1.5 mm openings, which can be used for field wiring, direct attachment of a sensor, or wiring of a remote sensor. o
The explosion-proof enclosure provides four M20 x 1.5 mm openings, which can be used for field wiring, direct attachment of a sensor, or wiring of a remote sensor. o
Unused openings must be closed with a suitable plug and gasket, maintaining the IP or Ex d rating. o
Secondary circuit must be supplied from an isolating source (not applicable for relay circuits). o
The wiring for the relays must be selected and fused according to the rated voltages, currents, and environmental conditions. o
If stranded conductors are used, a ferrule should be used. o
To improve RFI immunity in extreme environments, it might be necessary to ground the shield of the communications cable at the PLC, GDA controller, front-end controller, or Building
Management System (e.g., the chassis, the ground bus-bar, etc.).
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 on page 62. 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.
• The instrument accepts wire sizes of 16 AWG (1.5 mm 2
) to 20 AWG (0.5 mm
2
).
• 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 on page 62. 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 on page 62.
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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.
• Use the drilling template for proper positioning (see Installation Guide P/N 1100-0999).
• Ensure that any installed sensor is pointing downwards.
• Bacharach recommendations using M5 bolts (or smaller) with hex socket caps to mount the device.
3.4 Electrical Installation
3.4.1 Preparations
CAUTION
Ensure wiring for relays and connections for sensor(s) are made before applying power.
CAUTION
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.
NOTICE
For unused 4 to 20 mA analog outputs, ensure that the wire-bridge (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.
• Open the enclosure lid. For the general purpose (GP) enclosure, loosen the four screws using an
M5 hex key and remove the lid from the base. For the explosion proof (XP) enclosure, loosen the hex set-screw (1.5 mm hex key) and unscrew the lid from the instrument base.
12
• To access the Interface Board, use a flat-head screwdriver to loosen the three captive screws on the Processor Board. Access the captive screws through holes in the Display Bezel. Carefully pull out the bezel and Processor Board (as a single unit) from the enclosure. Note that a ribbon cable connects the Processor Board to the Interface Board.
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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.
Connection
Power
Description
24 VAC
24 VDC
*
Pin
1
2
1
2
Label
+ 24VDC/AC
PWR GND
+ 24VDC/AC
PWR GND
Wiring Termination
24 VAC line
24 VAC neutral
24 VDC positive
24 VDC ground
Analog Output
Analog Output 1
Analog Output 2
*
*
3
4
5
6
7
ANALOG 1 GND Analog output 1 ground
ANALOG OUT 1 Analog output 1 signal (+)
ANALOG 2 GND Analog output 2 ground
ANALOG OUT 2 Analog output 2 signal (+)
RS-485 GND RS-485 shield
Digital Output
Modbus Network
Communications
8
9
A
B
RS-485 “A” (non-inverted)
RS-485 “B” (inverted)
* 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.
• 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, 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.
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3.4.3 Relay Wiring
MGS-550 Fixed Gas Detector
At voltages > 30 VAC or > 42.2 VDC, the relay cables must be enclosed in protective conduit, or double-insulated cables must be used.
WARNING
• 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
Relay 1 Output
Pin
10
11
12
13
RELAY 1 NC
RELAY 1 C
RELAY 1 NO
RELAY 2 NC
Label Wiring Termination
Relay 1 NC contact
Relay 1 common contact
Relay 1 NO contact
Relay 2 NC contact
Relay 2 Output
Relay 3 Output
14
15
16
17
18
RELAY 2 C
RELAY 2 NO
RELAY 3 NC
RELAY 3 C
RELAY 3 NO
Relay 2 common contact
Relay 2 NO contact
Relay 3 NC contact
Relay 3 common contact
Relay 3 NO contact
To change relay designations, see section 4.4.2: Relay Designation (RX-xx) on page 32. For default
values, see section 6: Factory Default Settings on page 57.
When configured according to the factory default settings, the relays are de-energized during normal
operation mode.
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.
NOTICE
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MGS-550 Fixed Gas Detector
3.4.4 Installation of 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 or Ex d 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.
Register Sensor (F-06) on page 26.
16
NOTICE
A sensor is automatically recognized and registered by the instrument after a power cycle. Alternatively, function F-06 can be used to register a sensor without a power-
cycle. See section 4.3.6: Register Sensor (F-06) on page 26, section 4.3.7: De-register
One Sensor (F-07) on page 27, and section 4.3.8: De-register All Sensors and Reset
Node Address (F-08) on page 27.
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3.4.5 Connecting One or More MGS-550s to a Bacharach Controller
For wiring and configuration information, please refer to the manual which was included with the Bacharach controller (e.g., MGS, GDA, etc.).
NOTICE
• 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).
3.4.6 Modbus RTU Interface
• For the Modbus network use an 18 to 24 AWG (0.5 to 1 mm 2
) shielded twisted pair wire with a 120
Ω 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) on page 35.
• 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) on page 35.
3.4.7 Conclusion
After all wiring is completed, be sure to replace components and seal the enclosure.
• Place the bezel and electronics circuit board back into the enclosure. Secure them to the standoffs with the three screws.
• For the general purpose (GP) instrument, put lid back on and tighten the four screws. For the explosion proof (XP) instrument, screw on the lid until it is seated, and then tighten the set screw.
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MGS-550 Fixed Gas Detector
SECTION 4. OPERATION
4.1 Overview of Normal Operation
Before leaving the instrument for normal operation, check the configuration for proper settings and check calibration.
WARNING
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) on page 35.
The instrument output will be OFFLINE (see section 4.3.1: Offline Mode (F-01) on page 25). If two
sensors are installed, both target gas names and “0”s will be toggled sequentially.
NOTICE
Note that 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 on page 62 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
4.1.4 The 5-Digit Display and LEDs
In normal operation, the 5-digit, 7-segment LED display toggles between the gas name (CO
2
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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MGS-550 Fixed Gas Detector
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 on page 36). 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.
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) on page 25.
The first character represents an “M”. This is found in the Modbus
parameters (MB-xx). Refer to section 4.4.5: Modbus Configuration (MBxx) on page 35.
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) on page 26.
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
This is a second 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-register All Sensors and Reset Node Address (F-
08) on page 27 for additional information.
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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.
NOTICE
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.
NOTICE
Depending on the sensor and measuring range, the gas concentration may or may not be shown with a decimal point.
4.2 Menus
4.2.1 General Navigation
The MGS-550 offers two methods of navigating through the menu.
• Use the non-intrusive magnetic wand (tapping above the “magnetic” icons with dashes)
• Use the internal push buttons (pressing the push button points).
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MGS-550 Fixed Gas Detector
Magnetic Switch Points
GP XP
Internal Push
Button Points
Function(s)
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.
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.
NOTICE
NOTICE
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].
• 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.
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4.2.4 Menu Overview
MGS-550 Fixed Gas Detector
The menu is divided in functions and parameters. Individual parameters are grouped into logical menus.
Function
F-01
F-02
F-03
F-04
F-05
Description
00 = instrument online, 01 = instrument OFFLINE
1 = zero sensor 1, 2 = zero sensor 2
1 = span sensor 1, 2 = span sensor 2
Instrument test
Access parameters:
Parameters Description
S1-XX
S2-XX
RX-XX
AF-XX
AX-XX
MB-XX
P1-01
B1-XX
Sensor 1 settings
Sensor 2 settings – if connected
Relay settings
Alarm functions
Analog output configuration
Modbus configuration
Display mode
Buzzer settings
F-06
F-07
F-08
Register sensor
De-register one sensor
F-09
F-10
De-register all sensors and reset node address
Access diagnostics, system information, and fault parameters
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.
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4.3 Functions
4.3.1 Offline Mode (F-01)
MGS-550 Fixed Gas Detector
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.
NOTICE
OFFLINE mode automatically times out 30 minutes after returning to normal operation
(i.e., after exiting the function menu).
Item
Green LED
Display
Analog Output
Modbus Registers
Alarm States
Faults
Behavior in OFFLINE Mode
On
Displays “oFFLn” or function and parameter numbers or user interaction in place of the gas level when applicable
4 to 20 mA
0 to 5 V
Changes to 3 mA
Stays at last valid value
0 to 10 V
1 to 5 V
Stays at last valid value
0 V
2 to 10 V 0 V
Offline flag (Modbus register 10024) is active (must be monitored).
Concentration registers stay at their last valid values.
Any pre-existing alarm condition is cancelled
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)
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 on page 38 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: o
1 = relay test o
2 = analog output test o
3 = display test.
After exiting this function, the instrument returns to the function menu and all test overrides are removed.
P/N: 1100-1000 Version 1 25
MGS-550 Fixed Gas Detector
# Test
1
2
Relay
Analog
Output
Description
The relay test changes the state of each relay. Use the [UP] / [DOWN] key to toggle the relay. Tap [ENTER] to test the next relay. Tap [i] to exit the function.
Note that c hanging 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.
NOTICE
Changing the analog outputs can trigger alarms in connected equipment.
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 on page 23 and
section 4.4: Parameters on page 29 for detailed information.
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.
CAUTION
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 reregister 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 CAUTION on the following page.
Generally, a new sensor is discovered and registered automatically when the following occurs:
• power is shut off
• the new sensor is connected, and
• power is then restored.
For example, if you wish to add a second sensor to a previously installed single-sensor system, simply turn off power, add the new sensor to the available (previously unoccupied) sensor connector, and turn on power. Upon power up, the instrument will recognize and register the new sensor that you installed in the previously unfilled slot.
If it is inconvenient or impractical to cycle power to automatically register a new sensor, then the process is performed manually using the Register Sensor function F-06.
26 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
CAUTION
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
Sensor is already registered
Normal registration/ adding a sensor
Address conflict
Description
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 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.
Removing a sensor without first de-registering it will result in a fault. Always de-register a sensor before permanently removing it.
NOTICE
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 on page 44 for information.
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.
NOTICE
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) on page 26.
• 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.
P/N: 1100-1000 Version 1 27
MGS-550 Fixed Gas Detector
CAUTION
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 reregister 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.
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 on page 39 for additional information.
NOTICE
The diagnostics attributes can be accessed directly during normal operation by tapping and holding [UP] for more than 3 seconds.
4.3.10 Reset System to Factory Default Setting (F-10)
6: Factory Default Settings on page 57 for a list.
Resetting the system to its factory default values will not reset sensor calibrations.
NOTICE
NOTICE
Function F-10 resets all parameters (except sensor registration information) to their
factory default values (see Factory Default Settings on page 57). 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.
28 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
4.4 Parameters
4.4.1 Sensor 1 Settings (S1-xx) and Sensor 2 Settings (S2-xx) if Connected
S1 & S2 Param
S1-01
S1-02
S1-04
S1-05
S2-01
S2-02
S2-04
S2-05
Name (n=1 or 2)
Sensor n Gas Name
Sensor n UID
S1-03 S2-03
Sensor n Low Alarm ppb/ppm/%LEL/Vol%
Sensor n Medium Alarm ppb/ppm/%LEL/Vol%
Sensor n High Alarm ppb/ppm/%LEL/Vol%
Description (n=1 or 2)
Abbreviated Gas Name
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-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
S1-06 S2-06
Sensor n Low Alarm
Behavior
S1-07 S2-07
Sensor n Medium Alarm
Behavior
S1-08 S2-08
Sensor n High Alarm
Behavior
S1-09 S2-09
Sensor n Type Code
S1-10 S2-10
Sensor n Units
S1-11
S1-12
S2-11
S2-12
Sensor n Full Scale
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
4-digit sensor code (read-only)
Read-Only. Sensor n measurement units:
1 = ppm
2 = ppb
3 = Vol%
4 = %LEL
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 on page 38) or
by changing the value manually.
0 = Sensor OK
1 = Sensor in operation for >6 months without calibration. Recalibration recommended.
P/N: 1100-1000 Version 1 29
MGS-550 Fixed Gas Detector
NOTICE
A fixed hysteresis of 5% of full scale is set in order to avoid chatter at an alarm threshold.
For all instruments except oxygen, the alarm occurs on gas concentrations that increase beyond the set-points.
NOTICE
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.
30 P/N: 1100-1000 Version 1
NOTICE
MGS-550 Fixed Gas Detector
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.
NOTICE
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.
Latching Acknowledgeable Explanation
No
No
Yes
No
Yes
No
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.
Yes Yes
The alarm state must be reset manually and can be reset before the alarm condition clears.
Latching and acknowledgment does not just affect relay states, but also the buzzer state and Modbus status flags.
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MGS-550 Fixed Gas Detector
4.4.2 Relay Designation (RX-xx)
Parameter
R1-01
R1-02
R2-01
R2-02
R3-01
R3-02
Name Description
Relay 1 Contact Behavior Select behavior for Relay 1: 0 = NO, 1 = Failsafe.
Relay 1 Source 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
Relay 2 Contact Behavior Select behavior for Relay 2: 0 = NO, 1 = Failsafe.
Relay 2 Source Select alarm configuration (01 to 14) to activate Relay 2.
See R1-02 above for source codes.
Relay 3 Contact Behavior Select behavior for Relay 3: 0 = NO, 1 = Failsafe.
Relay 3 Source 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
• R2-02=06
• R3-02=13
Fault).
Relay 1 configured as 01 (Sensor 1 Low Alarm)
Relay 2 configured as 06 (Sensor 2 Medium Alarm)
Relay 3 configured as 13 (Any Sensor Fault or Instrument Electronics Critical
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).
CAUTION
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).
32 P/N: 1100-1000 Version 1
4.4.3 Alarm Configuration (AF-xx)
MGS-550 Fixed Gas Detector
Parameter
AF-01
Name Description
Alarm ON Delay Value 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-02
Once programmed, all alarms have the same ON delay.
NOTICE
Alarm OFF Delay Value 00 = no delay, 01 to 15 = delay in minutes.
If an alarm OFF delay is set, the gas concentration has to be continuously below (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.
AF-03
Critical Fault Latch
Mode
AF-04
Alarm Acknowledge
Timeout
Once programmed, all alarms have the same OFF delay.
NOTICE
0 = non-latching, 1= latching
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
NOTICE
If an alarm state has been acknowledged, but the condition still exists after the timeout period, the alarm state will be triggered again.
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MGS-550 Fixed Gas Detector
4.4.4 Analog Output Configuration (AX-xx)
Parameter
A1-01
A1-02
A1-03
Name
Analog Output 1
Source
Description
1 = Sensor 1
2 = Sensor 2
Analog Output 1 Type 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
Analog Output 1
Scaling
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 signal) on the analog interface.
Example: Consider an application with a required range of 0 to 20,000 ppm CO
2
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.
A1-04
A2-01
A2-02
A2-03
A2-04
NOTICE
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 (S2xx) if Connected on page 29.
Analog Output 1 Offset 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 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).
Analog Output 2
Source
Same as A1-01, but for output 2 (see description above).
Analog Output 2 Type Same as A1-02, but for output 2 (see description above).
Analog Output 2
Scaling
Same as A1-03, but for output 2 (see description above).
Analog Output 2 Offset Same as A1-04, but for output 2 (see description above).
34 P/N: 1100-1000 Version 1
4.4.5 Modbus Configuration (MB-xx)
MGS-550 Fixed Gas Detector
Parameter
MB-01
MB-02
Name
Modbus Node Address
RS-485 Baud Rate 0 = 9600
1 = 19200
MB-03
MB-04
RS-485 Stop Bits
RS-485 Parity
1 or 2
0 = None
1 = Odd
2 = Even
MB-05
Modbus Slave Termination 0 = Out
1 = In
4.4.6 Display Mode (P1-01)
Description
Set the RS-485 node address (001 to 255)
Parameter
P1-01
Name
Display Mode
Description
Defines whether or not the gas name and concentration are displayed during normal operation.
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).
4.4.7 Buzzer Designation (B1-xx)
Parameter
B1-01
Name Description
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) on page 32 for a list of alarm configurations.
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MGS-550 Fixed Gas Detector
SECTION 5. MAINTENANCE
5.1 Maintenance Intervals
Interval
During
Commissioning
Function
Check calibration.
Check signal transmission to the central controller.
Check LEDs for proper operation.
Check for proper triggering of alarm devices.
Every 6
Months*
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 Bacharach for sensor exchange with factorycalibrated sensor.
As Required
Replace sensor(s). See section 5.4 Sensor Maintenance on page 44.
* 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.
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.
WARNING
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.
WARNING
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.
NOTICE
The sensor should be fully warmed-up (refer to section 4.1.1: Applying Power and the
Start-up Sequence on page 18).
36 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
NOTICE
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) on page 25), 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 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.
• For the general purpose type sensors (see figure below), connect the tubing to the calibration port
(the barbed fitting) of the splash guard.
• Push the calibration adapter over the sensing head assembly.
• 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.
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.
NOTICE
P/N: 1100-1000 Version 1 37
MGS-550 Fixed Gas Detector
5.2.3 Zero Adjustment
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 crosssensitive (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.
WARNING
For oxygen (O
2
) and carbon dioxide (CO
2
) sensors, use only nitrogen (N
2
) gas.
A sensor must be re-zeroed if it shows underflow saturation.
NOTICE
• Enter the menu and select function F-02 Zero Sensor.
• Use [UP] / [DOWN] to select the sensor to be calibrated, then tap [ENTER].
37) 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 on page 37) and tap [ENTER].
• 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.)
38 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
• 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
0
1
2
3
0
1
2
1 + 2
4
5
6
7
5.3.2 Diagnostics Attributes
Equivalent
Error Code(s)
4
1 + 4
1 + 2 + 3
1 + 2 + 4
Hex
Code
8
9
A
B
Equivalent
Error Code(s)
8
1 + 8
2 + 8
1 + 2 + 8
Hex
Code
C
D
E
F
Equivalent
Error Code(s)
4 + 8
1 + 4 + 8
2 + 4 + 8
1 + 2 + 4 + 8
Attribute
D-01
D-02
D-03
Description
Reads the current instrument fault code xxxx:
0000 = No faults
0001 = Reported temperature outside operating range (Non-critical, E300)
0002 = Master RX buffer full
0004 = Slave RX buffer full
(Non-critical, E300)
(Non-critical, E300)
0008 = CRC error in received packet
0010 = CRC error in received packet
0020 = Packet timeout
0040 = Either Current loop open
(Non-critical, E300)
(Non-critical, E300)
(Non-critical, E300)
(Non-critical, E300)
0080 = Stuck key or magnetic switch
0100 = No registered sensors
0200 = Sensor 1 reporting a critical fault
(Non-critical, E300)
(Critical, E100)
(Critical, E100)
(Critical, E100) 0400 = Sensor 2 reporting a critical fault
0800 = Sensor 1 is registered, but not responding correctly or wrong sensor installed (Critical, E100)
1000 = Sensor 2 is registered, but not responding correctly or wrong sensor installed
2000 = Power supply voltage(s) out of range
4000 = MPU clock fault
8000 = Can’t read EEPROM
(Critical, E100)
(Critical, E100)
(Critical, E100)
(Critical, E100)
For more information on these faults, refer to table in section 5.3.3: Instrument Electronics
Critical (E100) Faults on page 40 and section 5.3.4: Non-Critical (E300) Faults on page
41. Refer to section 5.3.1Hexadecimal Format on page 39 for combined codes.
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.
Supply voltage
P/N: 1100-1000 Version 1 39
MGS-550 Fixed Gas Detector
Attribute
D-04
Description
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.
D-05
D-06
D-07
D-08
D-09
D-10
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
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
For more information on these faults, Refer to table in section 5.3.5: Sensor Faults on
page 42. Refer to section 5.3.1: Hexadecimal Format on page 39 for combined codes.
Sensor 1 last fault code. See D-07 list. To clear, see Diagnostics D-02.
Sensor 2 current fault code. Same as D-07. See D-07 list.
Sensor 2 last fault code. See D-07 list. To clear, see Diagnostics D-02.
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.
Remedy
Add sensor. Replace sensor.
Code Critical Fault
0200 Sensor 1 critical fault
Possible Causes
No sensor or defective sensor.
Sensor removed and not deregistered.
Two with same node address.
0400 Sensor 2 critical fault
Same as Sensor 1.
See above.
Deregister sensor, then remove. See section 4.3.7:
De-register One Sensor (F-07) on page 27.
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) on page 27 and
section 4.3.6: Register Sensor (F-06) on page 26.
Same as Sensor 1. See above.
40 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
Code Critical Fault Possible Causes
0800 Sensor 1 error Sensor is registered,
1000 Sensor 2 error but not responding correctly or the wrong sensor installed.
2000 One or more power supply voltages out of range
4000 Microprocessor fault
8000 Can’t read
EEPROM
Input supply power to the MGS-550 is out of range.
Internal electronics hardware error.
Remedy
Sensor was removed. Replace sensor.
Sensor was replaced without re-registration.
Register sensor. See section 4.3.6: Register
Correct the input supply voltage to restore normal
operation. See section 9.1: General Specifications on page 62.
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
Non-Critical
Fault
0001 Reported temperature outside operating range
Possible Causes
Instrument temperature is outside specification
Remedy
0002 Master receiver buffer full
0004 Slave receiver buffer full
RS-485 Message too long for receiver buffer
0008 Checksum
(CRC) error in received packet
Transmission is corrupted (computed checksum doesn’t match transmitted checksum)
0010 Checksum
(CRC) error in received packet
0020 Packet timeout Modbus message was truncated or timed out early
Verify that ambient air conditions are within specifications range for the instrument (see
section 9.1: General Specifications on page
62) and for the sensor (see section 9.2:
Sensor Specifications on page 63).
Correct ambient air conditions.
Cycle power to the instrument.
Cycle power to the PLC or control system (if applicable).
Verify proper shielding on network
communications wiring. Refer to section 3.1:
General Information for Installation on page
11 and section 9.1: General Specifications on page 62 for more information.
Verify proper grounding of the
communications wiring. Refer to section 0:
Connecting One or More MGS-550s to a
Bacharach Controller on page 17.
P/N: 1100-1000 Version 1 41
MGS-550 Fixed Gas Detector
Code
Non-Critical
Fault
0040 Either current loop open
Possible Causes
Possible wiring, connection, and/or termination issue exists.
Analog output is set to 4 to 20 mA and loop is open.
Remedy
Verify proper communications settings for the
network. Refer to section 4.4.5: Modbus
Configuration (MB-xx) on page 35 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:
Check the integrity of the 4 to 20 mA connections to the interface PCB
5.3.5 Sensor Faults
NOTICE
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
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.
NOTICE
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 Sensor Fault Possible Causes Remedy
0000
0001
No Fault
No sensor signal Cannot detect sensor
0002 Sensor board hardware fault
Cannot read EEPROM or analog front end
0004 EEPROM checksum fault Error reading EEPROM
0008 Zero adjust out of range Field zero adjustment exceeds limits
0010 Span adjustment out of range
0020 Input voltage fault
0040 Microprocessor fault
0080 Software fault
0100 RS485 receiver fault
Field span adjustment exceeds limits
Power supply voltage out of range
MPU clock fault
Check all connections in the sensing head.
Check connections to the interface board.
Check all connections in the sensing head.
Replace sensor module.
Perform zero adjustment
Perform span adjustment
Call service
Call service
Firmware error Power-cycle. If it reoccurs then call service
Receiver buffer full ( message too Power-cycle. If it re-
42 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
Code Sensor Fault Possible Causes
long to receive buffer)
Remedy
occurs then call service
0200
0400
RS485 checksum fault
Modbus fault
Checksum error in received packet Power-cycle. If it reoccurs then call service
Packet timeout. Modbus message truncated or timed out early
Power-cycle. If it reoccurs then call service
0800 Temperature sensor fault Temperature sensor disconnected or no valid reading
1000 Temperature out of range fault
Temperature out of range
EC analog front end failure
Check connection to sensor PCB
Confirm that sensing head is operating within specifications
Replace sensor module 2000 Analog front end communications fault
4000 Negative gas concentration fault
8000 Sensor configuration fault
Sensor has drifted too negative
General error in sensor configuration
Perform zero and span calibration
Replace sensor module
P/N: 1100-1000 Version 1 43
MGS-550 Fixed Gas Detector
5.4 Sensor Maintenance (General Purpose Housings)
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 is not damaged.
NOTICE
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) on page 27
• 4.3.7: De-register One Sensor (F-07) on page 27
• 4.3.6: Register Sensor (F-06) on page 26.
Item
1
2
Description
Sensor cable
Sensor connector
See figure above
See figure above
Replacement Instructions
3
4
Sensing head base
O-ring
See figure above
See figure above
5
6
Sensor control board
Sensor module (sensor plus PCB)
5.4.3: Replacing the Sensor Control Board on page 46
5.4.2: Replacing the Sensor Module on page 45
7
8
9
Optional spacer
Foam sensor gasket
Sensing head cap
See figure above (used with
SC combustible and SC VOC sensors)
See figure above
See figure above
10 Permeable membrane See figure above
11 Lock nut (M40 X 1.5) See figure above
12 Splash guard
1-12 Entire Assy (Local)
1-12 Entire Assy (Remote)
See figure above
5.4.4: Replacing the Local Sensing Head Assembly on page 47
5.4.6: Replacing the Remote Sensing Head Assembly on page 49
44 P/N: 1100-1000 Version 1
5.4.2 Replacing the Sensor Module
See illustration in section 5.4.1: Components Overview on page 44.
Step
1
2
3
4
Description
Power down the instrument.
Unscrew M40 locknut (item 10).
Pull sensor cap (item 9) down.
Remove sensor spacer (optional on certain sensors) if it is in place.
5
6
7
8
Remove foam gasket (item 8) if it is adhered to the sensor module.
Remove the sensor module (item 6) from sensor control board (item 5).
With flat edges of PCBs aligned, plug new sensor module into sensor control board.
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.
MGS-550 Fixed Gas Detector
P/N: 1100-1000 Version 1 45
MGS-550 Fixed Gas Detector
5.4.3 Replacing the Sensor Control Board
See illustration in section 5.4.1: Components Overview on page 44.
Step
1
2
3
4
Description
Power down the instrument.
Unscrew M40 locknut (item 10).
Pull sensor cap (item 8) down.
Remove sensor spacer (optional on certain sensors) , if it is in place (if applicable).
5
6
7
8
Remove foam gasket (item 7) if it is adhered to the sensor module.
Pull out sensor and PCB stack (items 5 and
6) from the sensing head base (item 3).
Remove sensor control board (item 5) from sensor module (item 6).
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
16 Verify calibration.
46 P/N: 1100-1000 Version 1
5.4.4 Replacing the Local Sensing Head Assembly
MGS-550 Fixed Gas Detector
See illustration in section 5.4.1: Components Overview on page 44.
Step
1
2
3
4
5
6
7
8
9
Deregister the old sensor (see section
4.3.7: De-register One Sensor (F-07) on page 27).
Power down the instrument.
Loosen the four screws of the lid using an M5 hex key and remove the lid.
Using a flat-head screwdriver, loosen the three screws and carefully pull out the bezel from the enclosure.
Unplug the old sensing head.
Unscrew the old sensing head.
Screw sensing head with attached gasket into the housing and tighten
(maintain IP rating).
Plug new sensing head connector into socket.
Place bezel back into the enclosure and secure with the three screws to the standoffs.
10 Put lid back on and tighten the four screws.
11 Power-up instrument.
12 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”).
Description
P/N: 1100-1000 Version 1 47
48
MGS-550 Fixed Gas Detector
5.4.5 Adding a Second Sensor
Step
1
2
Description
Power down the instrument.
Open the housing.
For the GP housing:
• Loosen the four screws of the lid using an
M5 hex key and remove the lid.
3
4
5
6
7
8
Using a flat-head screwdriver, loosen the three screws and carefully pull out the bezel from the enclosure.
Remove an unused plug from the enclosure, if necessary.
Feed the connector end of the sensor assembly into the enclosure.
For the GP housing:
• Screw cable gland with attached gasket into the housing and tighten (maintain IP rating).
Plug the new sensing head connector into the open sensor connector socket on the interface board.
Place the bezel back into the enclosure and secure with the three screws to the standoffs.
Replace the enclosure lid as appropriate. 9
10 Power-up the instrument.
11 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”).
P/N: 1100-1000 Version 1
5.4.6 Replacing the Remote Sensing Head Assembly
See illustration in section 5.4.1: Components Overview on page 44.
Step
1
2
3
4
Power down the instrument.
Loosen the four screws of the lid using an M5 hex key and remove the lid.
Using a flat-head screwdriver, loosen the three screws and carefully pull out the bezel from the enclosure.
Unplug the old sensing head.
5
6
7
Unscrew cable gland of old sensing head and remove.
Screw cable gland into the housing and tighten (maintain IP rating).
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 four 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”).
Description
MGS-550 Fixed Gas Detector
P/N: 1100-1000 Version 1 49
MGS-550 Fixed Gas Detector
5.5 Sensor Maintenance (Explosion Proof Housings)
5.5.1 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 is not damaged.
NOTICE
If the instrument has two sensors installed, and both sensors, modules or heads are to 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 are to 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) on page 27
• 4.3.7: De-register One Sensor (F-07) on page 27
• 4.3.6: Register Sensor (F-06) on page 26.
Item Description
1
2
3
4
5
Sensor cable
Sensor connector
Sensing head base
Sensor control board
Sensor module (sensor plus PCB)
6
7
Optional spacer
Foam piece
8 Sensing head cap
1-8 Entire Assy (Local)
1-8 Entire Assy (Remote)
Replacement Instructions
See figure above
See figure above
See figure above
5.5.3: Replacing the Sensor Control Board on page 52
5.5.2: Replacing the Sensor Module on page 51
See figure above (optional)
See figure above
See figure above
5.5.4: Replacing the Local Sensing Head Assembly on page 53
5.5.5: Replacing the Remote Sensing Head Assembly on page 54
50 P/N: 1100-1000 Version 1
5.5.2 Replacing the Sensor Module
See illustration in section 5.5.1: Components Overview on page 50.
Step
1
2
Description
3
4
5
6
7
8
9
Power down the instrument.
Loosen the set screw (see photos to right) in the sensing head cap (item 8) using a 1.5 mm hex wrench.
Unscrew the sensing head cap (item
8) and remove.
Pull out sensor module (item 5) from sensor control board (item 4).
With flat edges of PCBs aligned, plug new sensor module into sensor control board.
Screw on the sensing head cap to the sensing head base (hand tight).
Tighten the set screw in the sensing head cap.
Power-up the instrument.
Verify calibration.
MGS-550 Fixed Gas Detector
P/N: 1100-1000 Version 1 51
MGS-550 Fixed Gas Detector
5.5.3 Replacing the Sensor Control Board
See illustration in section 5.5.1: Components Overview on page 50.
Step
1
2
3
4
5
6
7
8
Power down the instrument.
Loosen the set screw (see photos to right) in the sensing head cap (item 8) using a 1.5 mm hex wrench.
Unscrew the sensing head cap (item
8) and remove.
Pull out sensor and PCB stack (items
4 and 5) from the sensing head base
(item 3).
Remove sensor control board (item 4) from sensor module (item 5).
With flat edges of PCBs aligned, plug new sensor module into sensor control board.
Screw on the sensing head cap to the sensing head base (hand tight).
Tighten the set screw in the sensing head cap.
9 Power-up the instrument.
10 Verify calibration.
Description
52 P/N: 1100-1000 Version 1
5.5.4 Replacing the Local Sensing Head Assembly
See illustration in section 5.5.1: Components Overview on page 50.
Step
1
2
3
4
5
6
7
8
Power down the instrument.
Loosen the set-screw (1.5 mm hex key) and unscrew lid from instrument.
Using a flat-head screwdriver, loosen the three screws and carefully pull out the bezel from the enclosure.
Unplug the old sensing head.
Unscrew the old sensing head.
Screw sensing head into the housing and tighten (maintain
Ex d rating).
Plug new sensing head connector into socket.
Place bezel back into the enclosure and secure with the three screws to the standoffs.
9 Screw on lid until it is seated, then tighten the set-screw
(maintain Ex d rating).
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”).
Description
MGS-550 Fixed Gas Detector
P/N: 1100-1000 Version 1 53
54
MGS-550 Fixed Gas Detector
5.5.5 Replacing the Remote Sensing Head Assembly
See illustration in section 5.5.1: Components Overview on page 50.
Step
1
2
3
4
5
6
Power down the instrument.
Loosen the set-screw (1.5 mm hex key) and unscrew lid from instrument.
Using a flat-head screwdriver, loosen the three screws and carefully pull out the bezel from the enclosure.
Unplug the old sensing head.
Unscrew old remote XP sensing head from conduit to facilitate removal of old sensing head assembly.
Feed the connector end of the new remote XP sensing head through the conduit. Depending on the conduit that was used during installation, you may need to partially disassemble the conduit.
7
8
Screw the sensor end of the XP sensing head assembly into remote end of the conduit.
Plug new sensing head connector into the socket on the interface board.
9 Place bezel back into the enclosure and secure with the three screws to the standoffs.
10 Screw on lid until it is seated, then tighten the set-screw (maintain
Ex d rating).
11 Power-up the instrument.
12 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”).
Description
P/N: 1100-1000 Version 1
5.6 Replacing the Instrument Electronics
MGS-550 Fixed Gas Detector
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.
Step
1
Description
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
Power down the instrument. 2
3
4
5
6
7
Remove the housing lid.
• For general purpose (GP) enclosure, loosen the four screws of the lid using an M5 hex key and remove the lid.
• For the explosion proof (XP) enclosure, loosen the set-screw (1.5 mm hex key) and unscrew lid from instrument.
Using a flat-head screwdriver, loosen the three screws and carefully pull out the bezel and
Processor Board (as one unit) from the enclosure.
Unplug ribbon cable from Interface Board.
Remove the bezel from the processor
Board.
Attach bezel to new Processor Board.
8
9
Plug ribbon cable of new Processor
Board into socket of Interface Board.
Place bezel (and attached Processor
Board) back into the enclosure and secure with the three screws to the standoffs.
10 Power-up instrument.
11
Register the sensor(s) (both sequentially, if applicable). See section 4.3.6: Register Sensor
12 Place bezel back into the enclosure and secure with the three screws to the standoffs.
13 Replace the housing lid (maintain IP or Ex d rating).
• For general purpose (GP) enclosure, tighten the four screws of the lid using an M5 hex key.
• For the explosion proof (XP) enclosure, screw on the lid until it is seated, then tighten the set-screw (1.5 mm hex key).
14
Check settings of the parameters (see section 4.4: Parameters on page 29), perform an
instrument test (see section 4.3.4: Instrument Test (F-04) on page 25), and check calibration
(see section 5.2.4: Span Adjustment on page 38).
P/N: 1100-1000 Version 1 55
MGS-550 Fixed Gas Detector
5.7 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.
Step
1
2
3
4
5
6
7
8
Description
Power down the instrument.
Remove the housing lid.
• For general purpose (GP) enclosure, loosen the four screws of the lid using an M5 hex key and remove the lid.
• For the explosion proof (XP) enclosure, loosen the set-screw (1.5 mm hex key) and unscrew lid from instrument.
Using a flat-head screwdriver, loosen the three screws and carefully pull out the bezel and
Processor Board (as one unit) from the enclosure.
Unplug ribbon cable from Interface Board.
Label all connected wires, then disconnect all interface board wiring.
Using a Philip’s-head screwdriver, loosen the screws that hold the Interface Board in place. For the XP enclosure, you must loosen the standoffs to remove the
Interface Board. Remove the Interface
Board from the enclosure.
Replace the old Interface Board with the new one.
Secure the Interface Board to the enclosure by reversing the previous removal procedure.
9 With the Interface Board in place, and the standoffs secured, re-attach the wiring using the labels from the earlier step.
10 Place bezel and Processor Board back into the enclosure and secure with the three screws to the standoffs.
11 Replace the housing lid (maintain IP or Ex d rating).
• For general purpose (GP) enclosure, tighten the four screws of the lid using an M5 hex key.
• For the explosion proof (XP) enclosure, screw on the lid until it is seated, then tighten the set-screw (1.5 mm hex key).
12 Power up the instrument and verify proper operation.
5.8 Cleaning the Instrument
Clean the instrument with a soft cloth using water and a mild detergent. Rinse with water.
56 P/N: 1100-1000 Version 1
SECTION 6. FACTORY DEFAULT SETTINGS
MGS-550 Fixed Gas Detector
Changed To Parameter
S1-01
S1-02
S1-03
S1-04
S1-05
S1-06
S1-07
S1-08
S1-09
S1-10
S1-11
S1-12
S2-01
S2-02
S2-03
S2-04
S2-05
S2-06
S2-07
S2-08
S2-09
S2-10
S2-11
S2-12
R1-01
R1-02
R2-01
R2-02
Name
Sensor 1 Gas Name
Sensor 1 UID
Sensor 1 Low Alarm ppb/ppm/%LEL/Vol%
Sensor 1 Medium Alarm ppb/ppm/%LEL/Vol%
Factory Default
Sensor dependent
5-digits, alphanumeric
Sensor dependent
Sensor dependent
Sensor 1 High Alarm ppb/ppm/%LEL/Vol%
Sensor 1 Low Alarm Behavior
Sensor dependent
Sensor 1 Medium Alarm Behavior 3 = latching, not acknowledgeable
Sensor 1 High Alarm Behavior
2 = non-latching, acknowledgeable
3 = latching, not acknowledgeable
Sensor 1 Type Code
Sensor 1 Units
4-digit, alphanumeric
Sensor dependent
Sensor 1 Full Scale
Sensor 1 Test Flag
Sensor 2 Gas Name
Sensor 2 UID
Sensor 2 Low Alarm ppb/ppm/%LEL/Vol%
Sensor 2 Medium Alarm ppb/ppm/%LEL/Vol%
Sensor dependent
0 = sensor OK
Sensor dependent
5-digits, alphanumeric
Sensor dependent
Sensor dependent
Sensor 2 High Alarm ppb/ppm/%LEL/Vol%
Sensor dependent
Sensor 2 Low Alarm Behavior 2 = non-latching, acknowledgeable
Sensor 2 Medium Alarm Behavior 3 = latching, not acknowledgeable
Sensor 2 High Alarm Behavior
Sensor 2 Type Code
Sensor 2 Units
Sensor 2 Full Scale
Sensor 2 Test Flag
Relay 1 Contact Behavior /
Failsafe
Relay 1 Source
Relay 2 Contact Behavior /
Failsafe
Relay 2 Source
3 = latching, not acknowledgeable
4-digit, alphanumeric
Sensor dependent
Sensor dependent
0 = sensor OK
0 = normally open
1-Sensor system = 01
0 = normally open
1-Sensor system = 02
P/N: 1100-1000 Version 1 57
MGS-550 Fixed Gas Detector
R3-02
AF-01
AF-02
AF-03
AF-04
A1-01
A1-02
A1-03
A1-04
A2-01
A2-02
A2-03
A2-04
MB-01
MB-02
MB-03
MB-04
MB-05
P1-01
B1-01
Parameter
R3-01
Name
Relay 3 Contact Behavior /
Failsafe
Relay 3 Source
Alarm ON Delay Value
Alarm OFF Delay Value
Critical Fault Latching
Alarm Acknowledge Timeout
Analog Output 1 Source
Analog Output 1 Type
Analog Output 1 Scaling
Analog Output 1 Offset
Analog Output 2 Source
Analog Output 2 Type
Analog Output 2 Scaling
Analog Output 2 Offset
Modbus Node Address
RS-485 Baud Rate
RS-485 Stop Bits
RS-485 Parity
Modbus slave termination
Display Mode
Buzzer enable and source
Factory Default
0 = normally open
1-Sensor system = 04
00 = no delay
00 = no delay
1 = latching
59 minutes
1 = Sensor 1
4 = 4 – 20 mA
100% = full scale
0 = no offset
1 = Sensor 1
4 = 4 – 20 mA
100% = full scale
0 = no offset
001
0 = 9600
1
0 = None
0 = Out
1 = On
14 = any alarm or sensor fault or critical instrument fault
Changed To
58 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
SECTION 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 heat-of-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.
NOTICE
Certain substances in the atmosphere to be monitored may impair the sensitivity of the sensors. Such substances include, but are not limited to:
1. Polymerizing substances such as acrylonitrile, butadiene and styrene,
2. 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,
3. Catalyst poisons such as sulfurous and phosphorous compounds, silicon compounds (especially silicones), and metal-organic vapors.
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.
P/N: 1100-1000 Version 1 59
MGS-550 Fixed Gas Detector
NOTICE
Certain substances in the environment to be monitored may impair the sensitivity of the sensors:
1. Materials containing silicone or silicone rubber/putty
2. Corrosive gases such as hydrogen sulfide, sulfur oxide, chlorine, hydrogen chloride, etc.
3. 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.
60 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
SECTION 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 Bacharach Sales Organization for disposal. Please do not hesitate to contact Bacharach if you have any further questions on this issue.
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.
WARNING
Do not force open electrochemical sensors.
WARNING
Observe the applicable local waste disposal regulations. For information, consult your local environmental agency, local government offices or appropriate waste disposal companies.
P/N: 1100-1000 Version 1 61
MGS-550 Fixed Gas Detector
SECTION 9. TECHNICAL DATA
9.1 General Specifications
Category
Signals to
Central
Controller
Power Supply and Relays
Wiring
Physical
Specifications
Analog Current
Analog Voltage
Modbus RTU over
RS-485
Specifications
Normal operation: ..................................................... 4 to 20 mA
Drift below zero: ............................................................. 3.8 mA
Measuring range exceeded: ......................................... 20.5 mA
Instrument fault: ...........................................................
≤ 1.2 mA
Fault on analog interface: ............................................. > 21 mA
Offline mode/Maintenance signal: ............... 3 mA steady 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: ........................................... None, odd, even (selectable)
Stop bits: ....................................................... 1 or 2 (selectable)
Retry time: ............................. 500 ms, min time between retries
End of message: ....................................... Silent 3.5 characters
Operating voltage
Power Monitoring
Inrush current
Operating current, max.
19.5 to 28.5 VDC; 24 VAC ± 20%, 50/60 Hz
Green LED
1.5 A
330 mA at 24 VDC
Relay rating
Audible alarm
Alarm delay
3 SPDT, arbitrary designation
1 A at 24 VAC/VDC, 0.5 A at 125 VAC, resistive load
Internal Buzzer
≥85 dB at 4” (10 cm); open enclosure
0 to 15 minutes (selectable)
Power and analog signal
Modbus network
2-, 3-, 4-, or 6-core shielded cable, 16 to 20 AWG (0.5 to
1.5 mm
2
)
2-core twisted pair shielded cable 16 to 20 AWG (0.5 to
1.5 mm
2
) with 120 Ohm characteristic impedance
M20x1.5, 0.24” to 0.47” (6 to 12 mm) outer cable diameter Cable gland
Enclosure and sensor housing
General Purpose (GP): ABS
Explosion Proof (XP): Aluminum
Enclosure protection IP66
Display 5 digit, 7 segment LED
Enclosure Size
(WxHxD) (Approx.)
Weight (Approx.)
General Purpose (GP): 210x225x85 mm (8.3x8.9x3.1 in)
Explosion Proof (XP): 125x190x90 mm (4.9x7.5x3.5 in)
General Purpose (GP): 1 kg (2 lbs)
Explosion Proof (XP): 1.6 kg (3.5 lbs)
62 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
Category
Environmental Temperature
Specifications
- 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
Elevation
20.7 to 38.4 in. of Hg (700 to 1300 hPa)
0 to 10,000 ft. (3050 m) altitude
Sensors
Influences
See Section 9.2: Sensor Specifications on page 63.
For influences on the measurement performance and restrictions of a particular sensor see sensor data sheet.
CE, UL/CSA/IEC/EN 61010-1 Agency
Approvals
Company
Certifications
USA Certification (for units assembled in USA):
Bacharach (USA) is a TÜV-SÜD certified company.
Ireland Certification (for units assembled in Ireland):
Murco (a Bacharach Company) is an NSAI certified company.
9.2 Sensor Specifications
Sensor Information
Sensor Life (Typical)
Temperature Range
Electro-Chemical
(EC)
2 to 3 years
-20º to 40º C
-40º to 40º C
-4º to 104º F
-40º to 104º F
1
Semi-Conductor
(SC)
5 to 8 years
-40º to 50º C
-40º to 122º F
EC Sensors Formula
Ammonia
Carbon Monoxide
Chlorine
2
Fluorine
2
Hydrogen
Hydrogen Chloride
2
Hydrogen Cyanide
NH
3
CO
Cl
2
F
2
H
2
HCl
HCN
Hydrogen Sulfide
Nitrogen Dioxide
Oxygen
Ozone
2
H
2
S
NO
2
O
2
O
3
Sulfur Dioxide SO
2
1
For NH
3
sensor 0 to 100 ppm and 0 to 1,000 ppm only.
2
No IP rating; not available in Ex d
P/N: 1100-1000 Version 1
Catalytic Bead
(CAT)
5 years
-40º to 50º C
-40º to 122º F
Infrared
(IR)
5 years
-40º to 50º C
-40º to 122º F
Measuring Range(s)
0 to 100, 0 to 1,000, 0 to 5,000 ppm
0 to 1,000 ppm
0 to 10 ppm
0 to 1 ppm
0 to 10,000 ppm
0 to 10 ppm
0 to 30 ppm
0 to 100 ppm
0 to 20 ppm
0 to 30 Vol%
0 to 1 ppm
0 to 10 ppm
63
MGS-550 Fixed Gas Detector
IR Sensors
Carbon Dioxide
Formula
CO
2
Hydrocarbons
(Butane, Methane, and Propane)
C
4
H
10
CH
4
C
3
H
8
CAT Sensors
Combustible Gasses
(including Ammonia)
Formula
Various
SC Sensors
HFCs
HCFCs and HFOs
Hydrocarbons
Ammonia
Hydrogen
VOCs
Typical Example Gases
R134a, R404A, R407C, R410A, R507
R22
R1234YF
R1234ZE
R-448a, R-449a, R-452a, R-513a
Methane (Natural gas), Propane, Butane,
Iso-Butane, Ethylene
NH
3
H
2
Acetone, Chloroform, Ethanol, Methanol,
Methylene Chloride, Ethylene Chloride
9.3 Modbus Registers
Measuring Range
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%
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%
0 to 100 %LEL
0 to 100 %LEL
0 to 100 %LEL
Measuring Range
0 to 100 %LEL
Measuring Range
0 to 1,000, 0 to 10,000 ppm
0 to 1,000, 0 to 10,000 ppm
0 to 1,000 ppm
0 to 1,000, 0 to 10,000 ppm
0 to 1,000 ppm
0 to 5,000 ppm
(SC Ethylene is 0 to 2,000 ppm)
0 to 10,000 ppm
0 to 5,000 ppm
0 to 1,000 ppm
NOTICE
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.
64
NOTICE
If a sensor is not registered, then reading from a Modbus register associated with that sensor will generate a Modbus exception.
P/N: 1100-1000 Version 1
9.3.1 Analog Input Registers
MGS-550 Fixed Gas Detector
Analog input registers are read only and use Modbus function code 04 (Read Input Register).
Units Param Reg
30001
Description
16-bit Current Fault Code Instrument electronics
30002 16-bit Last Fault Code Instrument electronics
Range
E300) Faults
Critical Faults
-
-
-
-
D-01
D-02
- 30003 Software Version Instrument electronics
30004
-
30010
Reserved
30011 Sensor 1 Type Code
- -
-
-
S1-09
30012 Display units sensor 1
-
1 = ppm
2 = ppb
3 = Vol%
4 = %LEL
- S1-10
30013
Full Scale in ppb, ppm, %LEL or Vol%
Sensor 1 (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value.
For example, a reading of "205" is "20.5%".)
30014 Sensor 1 Gas Type Text Char 1, 2
30015 Sensor 1 Gas Type Text Char 3, 4
30016 Sensor 1 Gas Type Text Char 5, NULL
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.
30018 Alarm Low Set-Point Sensor 1
30019 Alarm Medium Set-Point Sensor 1
30020 Alarm High Set-Point Sensor 1
30021
Concentration ppb, ppm, %LEL or Vol%
Sensor 1 (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value.
For example, a reading of "205" is "20.5%".)
Units are in register 30012.
30022 Concentration Sensor 1
30023 Sensor timer Sensor 1
30024 ppm Hours Sensor 1 (upper long integer)
30025 ppm Hours Sensor 1 (lower long integer)
30026
Temperature Deg C Sensor 1
Note: Sensor PCB temp, not gas temp
0 to 65535
0 to 9; a to z
0 to 9; a to z
0 to 9; a to z
0 to 65535
0 to 100
0 to 100
0 to 100
0 to 65535
0 to 100
0 to 65535
-
-40 to +80
Unit dependent
ASCII Text
ASCII Text
ASCII Text
Unit dependent
% Full scale
% Full scale
% Full scale
Unit dependent
% Full Scale
Hours ppm Hours
°C
S1-11
S1-01
-
S1-03
S1-04
S1-05
-
-
-
-
-
30027 16 bit Fault Code Sensor 1
- D-07
P/N: 1100-1000 Version 1 65
MGS-550 Fixed Gas Detector
Reg Description
30028 Sensor 1 Instrument electronics UID Char 1,2
30029 Sensor 1 Instrument electronics UID Char 3,4
30030
Sensor 1 Instrument electronics UID Char
5,NULL
30031 Sensor 2 Type Code
Range
0 to 9; a to z
0 to 9; a to z
0 to 9; a to z
30032 Display units Sensor 2
-
1 = ppm
2 = ppb
3 = Vol%
4 = %LEL
30033
Full Scale in 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%".)
30034 Sensor 2 Gas Type Text Char 1,2
30035 Sensor 2 Gas Type Text Char 3,4
30036 Sensor 2 Gas Type Text Char 5,NULL
30037
%LEL/Vol% Conversion Factor * 10 Sensor 2.
This is the factor to convert the integer gas output level from %LEL or Vol% to ppm.
30038 Alarm Low Set-Point Sensor 2
30039 Alarm Medium Set-Point Sensor 2
30040 Alarm High Set-Point Sensor 2
30041
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%".)
30042 Concentration Sensor 2
30043 Sensor timer Sensor 2
30044 ppm Hours Sensor 2 (upper long integer)
30045 ppm Hours Sensor 2 (lower long integer)
30046 Temperature Deg C Sensor 2
30047 16-bit Fault Code Sensor 2
0 to 65535
0 to 9; a to z
0 to 9; a to z
0 to 9; a to z
0 to 65535
0 to 100
0 to 65535
0 to 100
0 to 65535
-
-40 to +80
0 to 9; a to z
0 to 9; a to z
30048 Sensor 2 Instrument electronics UID Char 1,2
30049 Sensor 2 Instrument electronics UID Char 3,4
30050
Sensor 2 Instrument electronics UID Char
5,NULL
30051 Sensor 1 Module SID Char 1,2
30052 Sensor 1 Module SID Char 3,4
30053 Sensor 1 Module SID Char 5,NULL
30054 Sensor 2 Module SID Char 1,2
0 to 9; a to z
0 to 9; a to z
0 to 9; a to z
0 to 9; a to z
0 to 9; a to z
66
Units
ASCII Text
ASCII Text
ASCII Text
-
-
Unit dependent
ASCII Text
ASCII Text
ASCII Text
Unit dependent
% Full scale
Unit dependent
% Full Scale
Hours ppm Hours
°C
-
Param
S1-02
S2-09
S2-10
S2-11
S2-01
-
-
-
-
-
-
-
-
-
D-09
ASCII Text
ASCII Text
ASCII Text
ASCII Text
ASCII Text
ASCII Text
ASCII Text
S2-02
-
-
P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
Reg Description
30055 Sensor 2 Module SID Char 3,4
30056 Sensor 2 Module SID Char 5,NULL
9.3.2 Analog Output Registers
Range
0 to 9; a to z
0 to 9; a to z
Units
ASCII Text
ASCII Text
Param
Analog output registers are readable (using function code 03) and writable (using function code 06).
Reg
40001 Display Mode
Description
40002 RS-485 Node Address
40003 Baud Rate
40004 Stop Bits
40005 Parity
40006 Alarm Delay ON Value
40007 Alarm Delay OFF Value
40008 Controller UID Char 1,2
40009 Controller UID Char 3,4
40010 Controller UID Char 5,NULL
40011 Sensor 1 Low Alarm ppb, ppm, %LEL or
Vol%. (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is
"20.5%".)
40012 Sensor 1 Med Alarm ppb, ppm, %LEL or
Vol%. (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is
"20.5%".)
40013 Sensor 1 High Alarm ppb, ppm, %LEL or
Vol%. (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is
"20.5%".)
40014 Sensor 1 Low Alarm Behavior
40015 Sensor 1 Medium Behavior
40016 Sensor 1 High Behavior
40017 Sensor 2 Low Alarm ppb, ppm, %LEL or
Vol%. (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is
"20.5%".)
40018 Sensor 2 Med Alarm ppb, ppm, %LEL or
Vol%. (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is
"20.5%".)
Range
0=Off, 1=On
1 to 250
0=9600, 1=19200
1 or 2
0=None, 1=Odd,
2=Even
00 to 15
00 to 15
0 to 9; a to z
0 to 9; a to z
0 to 9; a to z
0 to sensor full scale
0 to sensor full scale
0 to sensor full scale
0 to sensor full scale
0 to sensor full scale
Units
-
-
-
-
-
Minutes
Minutes
ASCII Text
ASCII Text
ASCII Text
Unit dependent
Unit dependent
Unit dependent
Unit dependent
Unit dependent
Menu
P1-01
MB-01
MB-02
MB-03
MB-04
AF-01
AF-02
S1-03
S1-04
S1-05
S1-06
S1-07
S1-08
S2-03
S2-04
P/N: 1100-1000 Version 1 67
MGS-550 Fixed Gas Detector
Reg Description
40019 Sensor 2 High Alarm ppb, ppm, %LEL or
Vol%. (Note: % LEL and Vol% sensors are always displayed as “x 10” the actual value. For example, a reading of "205" is
"20.5%".)
40020 Sensor 2 Low Alarm Behavior
40021 Sensor 2 Medium Behavior
40022 Sensor 2 High Behavior
40023 Analog Output 1 Source
40024 Analog Output 1 Type
40025 Analog Output 1 Scaling
40026 Analog Output 1 Offset
40027 Analog Output 1 Full Scale PPM
40028 Analog Output 2 Source
40029 Analog Output 2 Type
40030 Analog Output 2 Scaling
40031 Analog Output 2 Offset
40032 Analog Output 2 Full Scale PPM
40033 Relay 1 Contact Behavior/Failsafe
40034 Relay 2 Contact Behavior/Failsafe
40035 Relay 3 Contact Behavior/Failsafe
40036 Relay 1 Source
40037 Relay 2 Source
40038 Relay 3 Source
40039 Buzzer enable and source
Range
0 to sensor full scale
Units
Unit dependent
Menu
S2-05
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
20% to 100% of full scale
±410 (can take an output below zero)
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
20% to 100% of full scale
±410 (can take an output below zero)
0 = NO
1 = Failsafe
0 = NO
1 = Failsafe
0 = NO
1 = Failsafe
-
-
%
410 = 10% of full scale
-
-
%
410 = 10% of full scale
-
-
-
-
-
-
-
S2-06
S2-07
S2-08
A1-01
A1-02
A1-03
A1-04
A2-01
A2-02
A2-03
A2-04
R1-01
R2-01
R3-01
R1-02
R2-02
R3-02
B1-01
68 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
Reg
40040
40041
40042
40043
Description
Critical Fault Latch
Instrument electronics fault code
Instrument electronics last fault
Power supply voltage
40044 Hours since last test sensor 1
40045 Hours since last test sensor 2
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
9.3.3 Input Status Flags
Input status flags are readable (using function code 02).
Range
15.5-28.5 VDC or
24 VAC ±20%
Units
-
-
Volt
Hours
Hours
Reg
10001
10002
10003
10004
10005
10006
Description
Sensor 1 Low Alarm Flag
Sensor 1 Medium Alarm Flag
Sensor 1 High Alarm Flag
Sensor 1 Fault
Sensor 1 Saturation Overflow
Sensor 1 Saturation Underflow
10007 Sensor 1 Start-up
10008 - 10010
Reserved
10011
10012
10013
Sensor 2 Low Alarm Flag
Sensor 2 Medium Alarm Flag
Sensor 2 High Alarm Flag
10014 Sensor 2 Fault
0 or 1 = alarm
0 or 1 = alarm
0 or 1 = alarm
0 or 1 = fault
0 or 1 = gas > full scale
0 or 1 = gas < 0
0 or 1 = start-up
0 or 1 = alarm
0 or 1 = alarm
0 or 1 = alarm
0 or 1 = fault
Range
Menu
AF-03
D-01
D-02
D-04
D-05
D-06
P/N: 1100-1000 Version 1 69
MGS-550 Fixed Gas Detector
Reg
10015
10016
10017
Description
Sensor 2 Saturation Overflow
Sensor 2 Saturation Underflow
Sensor 2 Start-up
10018 - 10020
Reserved
10021 Relay 1 State
10022
10023
10024
Relay 2 State
Relay 3 State
Instrument Electronics Offline
10025
10026
Instrument Electronics Non-Critical Fault
Instrument Electronics Critical Fault
Range
0 or 1 = gas > full scale
0 or 1 = gas < 0
0 or 1 = start-up
0 or 1 = energized
0 or 1 = energized
0 or 1 = energized
0 or 1 = offline
0 or 1 = fault
0 or 1 = fault
A sensor must be re-zeroed if it shows underflow saturation.
NOTICE
9.3.4 Output Status Flags
Output status flags are readable using Modbus function code 01 and writable using function code 05.
Reg
00001
00002
00003
00004
00005
00006
Description
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.
Alarm Flag (0 or 1 = alarm) for any alarm
(not fault).
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 the end of the test the relays revert to their normal operation
Range
0 or 1 = need calibration
0 or 1 = need calibration
0 or 1 = alarm
70 P/N: 1100-1000 Version 1
Reg
00007
00008
Description
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.
• For 4-20mA it will drive 4mA
• For all voltage ranges it will drive 0V
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 7segment display segments, power LED and both units LEDs active simultaneously for 5 seconds. At the end the display will revert to normal operation.
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.
MGS-550 Fixed Gas Detector
Range
0 or 1 = test in process
0 or 1 = test in process
P/N: 1100-1000 Version 1 71
MGS-550 Fixed Gas Detector
SECTION 10. ORDERING INFORMATION
10.1 MGS-550 Instrument Only
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.
NOTICE
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, CO
2
, 0-5000 ppm
6600-8011 MGS-550 Gas Detector, IP66, IR, CO
2
, 0-10000 ppm
6600-8012 MGS-550 Gas Detector, IP66, IR, CO
2
, 0-20000 ppm
6600-8013 MGS-550 Gas Detector, IP66, IR, CO
2
, 0-30000 ppm
6600-8014 MGS-550 Gas Detector, IP66, IR, CO
2
, 0-40000 ppm
6600-8015 MGS-550 Gas Detector, IP66, IR, CO
2
, 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, NH
3
, 0-100 ppm
6600-8020 MGS-550 Gas Detector, IP66, EC, NH
3
, 0-1000 ppm
6600-8021 MGS-550 Gas Detector, IP66, EC, NH
3
, 0-5000 ppm
6600-8023 MGS-550 Gas Detector, IP66, EC, CO, 0-1000 ppm
6600-8024 MGS-550 Gas Detector, IP66, EC, NO
2
, 0-20 ppm
6600-8025 MGS-550 Gas Detector, IP66, EC, O
2
, 0-30 Vol%
6600-8026 MGS-550 Gas Detector, no IP rating, EC, Cl
2
, 0-10 ppm
6600-8027 MGS-550 Gas Detector, no IP rating, EC, F
2
, 0-1 ppm
6600-8028 MGS-550 Gas Detector, no IP rating, EC, O
3
, 0-1 ppm
6600-8029 MGS-550 Gas Detector, IP66, EC, SO
2
, 0-10 ppm
6600-8030 MGS-550 Gas Detector, IP66, EC, H
2
S, 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, H
2
, 0-10000 ppm
6600-8034 MGS-550 Gas Detector, IP66, CT, NH
3
, 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
72 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
P/N MGS-550 Gas Detector, IP66 with IP66 Sensor Installed at the Factory
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, NH
3
, 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, H
2
, 0-5000 ppm
6600-8073 MGS-550 Gas Detector, IP66, SC, CH
4
, 0-5000 ppm
6600-8074 MGS-550 Gas Detector, IP66, SC, VOC/Ethanol, 0-1000 ppm
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
P/N: 1100-1000 Version 1 73
MGS-550 Fixed Gas Detector
10.3 MGS-550 Ex d Instruments with Sensing Heads
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.
NOTICE
P/N
6600-8500
MGS-550 Ex d Instruments with Sensing Heads
MGS-550 Instrument ONLY, Ex d Enclosure (For remote sensor applications, order sensing heads below)
10.4 MGS-550 Gas Detector, Ex d Enclosure with Ex d Sensing Head
P/N
MGS-550 Gas Detector, Ex d Enclosure with Ex d Sensing Head
Installed at the Factory
6600-8510 MGS-550 Gas Detector, Ex d, IR, CO
2
, 0-5000 ppm
6600-8511 MGS-550 Gas Detector, Ex d, IR, CO
2
, 0-10000 ppm
6600-8512 MGS-550 Gas Detector, Ex d, IR, CO
2
, 0-20000 ppm
6600-8513 MGS-550 Gas Detector, Ex d, IR, CO
2
, 0-30000 ppm
6600-8514 MGS-550 Gas Detector, Ex d, IR, CO
2
, 0-40000 ppm
6600-8515 MGS-550 Gas Detector, Ex d, IR, CO
2
, 0-50000 ppm
6600-8516 MGS-550 Gas Detector, Ex d, IR, Butane, 0-100 %LEL
6600-8517 MGS-550 Gas Detector, Ex d, IR, Methane, 0-100 %LEL
6600-8518 MGS-550 Gas Detector, Ex d, IR, Propane, 0-100 %LEL
6600-8523 MGS-550 Gas Detector, Ex d, EC, CO, 0-1000 ppm
6600-8525 MGS-550 Gas Detector, Ex d, EC, O
2
, 0-30 Vol%
6600-8533 MGS-550 Gas Detector, Ex d, EC, H
2
, 0-10000ppm
6600-8534 MGS-550 Gas Detector, Ex d, CT, NH
3
, 0-100 %LEL
6600-8535 MGS-550 Gas Detector, Ex d, CT, LPG, 0-100 %LEL
6600-8536 MGS-550 Gas Detector, Ex d, CT, Methane, 0-100 %LEL
6600-8538 MGS-550 Gas Detector, Ex d, CT, Propane, 0-100 %LEL
6600-8539 MGS-550 Gas Detector, Ex d, CT, Butane, 0-100 %LEL
6600-8540 MGS-550 Gas Detector, Ex d, SC, R22, 0-1000 ppm
6600-8541 MGS-550 Gas Detector, Ex d, SC, R32, 0-1000 ppm
6600-8542 MGS-550 Gas Detector, Ex d, SC, R134a, 0-1000 ppm
6600-8543 MGS-550 Gas Detector, Ex d, SC, R404a, 0-1000 ppm
6600-8544 MGS-550 Gas Detector, Ex d, SC, R407a, 0-1000 ppm
6600-8545 MGS-550 Gas Detector, Ex d, SC, R407c, 0-1000 ppm
6600-8546 MGS-550 Gas Detector, Ex d, SC, R407f, 0-1000 ppm
6600-8547 MGS-550 Gas Detector, Ex d, SC, R410a, 0-1000 ppm
6600-8548 MGS-550 Gas Detector, Ex d, SC, R422, 0-1000 ppm
6600-8549 MGS-550 Gas Detector, Ex d, SC, R422d, 0-1000 ppm
6600-8550 MGS-550 Gas Detector, Ex d, SC, R427a, 0-1000 ppm
74 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
P/N
MGS-550 Gas Detector, Ex d Enclosure with Ex d Sensing Head
Installed at the Factory
6600-8551 MGS-550 Gas Detector, Ex d, SC, R507, 0-1000 ppm
6600-8552 MGS-550 Gas Detector, Ex d, SC, HFO1234YF, 0-1000 ppm
6600-8553 MGS-550 Gas Detector, Ex d, SC, HFO1234ZE, 0-1000 ppm
6600-8554 MGS-550 Gas Detector, Ex d, SC, R22, 0-10000 ppm
6600-8555 MGS-550 Gas Detector, Ex d, SC, R32, 0-10000 ppm
6600-8556 MGS-550 Gas Detector, Ex d, SC, R134a, 0-10000 ppm
6600-8557 MGS-550 Gas Detector, Ex d, SC, R404a, 0-10000 ppm
6600-8558 MGS-550 Gas Detector, Ex d, SC, R407a, 0-10000 ppm
6600-8559 MGS-550 Gas Detector, Ex d, SC, R407c, 0-10000 ppm
6600-8560 MGS-550 Gas Detector, Ex d, SC, R407f, 0-10000 ppm
6600-8561 MGS-550 Gas Detector, Ex d, SC, R410a, 0-10000 ppm
6600-8562 MGS-550 Gas Detector, Ex d, SC, R422, 0-10000 ppm
6600-8563 MGS-550 Gas Detector, Ex d, SC, R422d, 0-10000 ppm
6600-8565 MGS-550 Gas Detector, Ex d, SC, R507, 0-10000 ppm
6600-8567 MGS-550 Gas Detector, Ex d, SC, HFO1234ZE, 0-10000 ppm
6600-8569 MGS-550 Gas Detector, Ex d, SC, NH
3
, 0-10000 ppm
6600-8570 MGS-550 Gas Detector, Ex d, SC, R290, 0-5000 ppm
6600-8571 MGS-550 Gas Detector, Ex d, SC, R600, 0-5000 ppm
6600-8572 MGS-550 Gas Detector, Ex d, SC, H
2
, 0-5000 ppm
6600-8573 MGS-550 Gas Detector, Ex d, SC, CH
4
, 0-5000 ppm
6600-8574 MGS-550 Gas Detector, Ex d, SC, VOC/Ethanol, 0-1000 ppm
6600-8575 MGS-550 Gas Detector, Ex d, SC, Ethylene, 0-2000 ppm
10.5 MGS-550 5m Remote and Second Sensing Heads
NOTICE
Below is the MGS-550 Sensing Head Part Number Configurator. Part number format is:
6600-8ABC.
NOTICE
All 5m remote and second, directly mounted sensing heads must be ordered separately.
Code
"A"
1
6
7
8
IP66 Sensing Head Cable Type "A"
Select the Required Cable Length, Noting the "A" Code
IP66 Sensing Head: 5 meter cable, for remote sensor applications
Ex d Sensing Head: 5 meter cable, for remote sensor applications
Ex d Sensing Head: For mounting directly to MGS-550 instrument
IP66 Sensing Head: For mounting directly to MGS-550 instrument
P/N: 1100-1000 Version 1 75
MGS-550 Fixed Gas Detector
Codes
"B & C"
10
11
12
13
48
49
50
51
43
44
45
46
47
39
40
41
42
33
34
35
36
38
29
30
31
32
24
25
26
27
28
19
20
21
23
14
15
16
17
18
Sensing Head Target Gas and Range "B & C"
Select the Target Gas and Range, Noting the "B & C" Codes
IR, CO
2
, 0-5000 ppm
IR, CO
2
, 0-10000 ppm
IR, CO
2
, 0-20000 ppm
IR, CO
2
, 0-30000 ppm
IR, CO
2
, 0-40000 ppm
IR, CO
2
, 0-50000 ppm
IR, Butane, 0-100 %LEL
IR, Methane, 0-100 %LEL
IR, Propane, 0-100 %LEL
EC, NH
3
, 0-100 ppm (N/A in Ex d)
EC, NH
3
, 0-1000 ppm (N/A in Ex d)
EC, NH
3
, 0-5000 ppm (N/A in Ex d)
EC, CO, 0-1000 ppm
EC, NO
2
, 0-20 ppm (N/A in Ex d)
EC, O
2
, 0-30 Vol%
EC, Cl
2
, 0-10 ppm (no IP rating, N/A in Ex d)
EC, F
2
, 0-1 ppm (no IP rating, N/A in Ex d)
EC, O
3
, 0-1 ppm (no IP rating, N/A in Ex d)
EC, SO
2
, 0-10 ppm (N/A in Ex d)
EC, H
2
S, 0-200 ppm (N/A in Ex d)
EC, HCl, 0-10 ppm (no IP rating, N/A in Ex d)
EC, HCN, 0-30 ppm (N/A in Ex d)
EC, H
2
, 0-10000 ppm
CT, NH
3
, 0-100 %LEL
CT, LPG, 0-100 %LEL
CT, Methane, 0-100 %LEL
CT, Propane, 0-100 %LEL
CT, Butane, 0-100 %LEL
SC, R22, 0-1000 ppm
SC, R32, 0-1000 ppm
SC, R134a, 0-1000 ppm
SC, R404a, 0-1000 ppm
SC, R407a, 0-1000 ppm
SC, R407c, 0-1000 ppm
SC, R407f, 0-1000 ppm
SC, R410a, 0-1000 ppm
SC, R422, 0-1000 ppm
SC, R422d, 0-1000 pm
SC, R427a, 0-1000 ppm
SC, R507, 0-1000 ppm
76 P/N: 1100-1000 Version 1
Codes
"B & C"
52
53
54
55
73
74
75
76
67
69
70
71
72
61
62
63
65
56
57
58
59
60
77
78
79
MGS-550 Fixed Gas Detector
Sensing Head Target Gas and Range "B & C"
Select the Target Gas and Range, Noting the "B & C" Codes
SC, HFO1234YF, 0-1000 ppm
SC, HFO1234ZE, 0-1000 ppm
SC, R22, 0-10000 ppm
SC, R32, 0-10000 ppm
SC, R134a, 0-10000 ppm
SC, R404a, 0-10000 ppm
SC, R407a, 0-10000 ppm
SC, R407c, 0-10000 ppm
SC, R407f, 0-10000 ppm
SC, R410a, 0-10000 ppm
SC, R422, 0-10000 ppm
SC, R422d, 0-10000 ppm
SC, R507, 0-10000 ppm
SC, HFO1234ZE, 0-10000 ppm
SC, NH
3
, 0-10000 ppm
SC, R290, 0-5000 ppm
SC, R600, 0-5000 ppm
SC, H
2
, 0-5000 ppm
SC, CH
4
, 0-5000 ppm
SC, VOC/Ethanol, 0-1000 ppm
SC, R448a, 0-2000 ppm
SC, R-448a, 0-1,000 ppm (N/A in Ex d)
SC, R-449a, 0-1,000 ppm (N/A in Ex d)
SC, R-452a, 0-1,000 ppm (N/A in Ex d)
SC, R-513a, 0-1,000 ppm (N/A in Ex d)
P/N: 1100-1000 Version 1 77
MGS-550 Fixed Gas Detector
10.6 MGS-550 Replacement Parts and Accessories
P/N
6600-8400
6600-8401
MGS-550 Replacement Parts and Accessories
Replacement interface I/O PCB Assembly, MGS-550 GP. Base PCB with terminal blocks for IP66 housing.
Replacement interface I/O PCB Assembly, MGS-550 XP. Base PCB with terminal blocks for Ex d housing.
6600-8402 Replacement display PCB Assembly, MGS-550 GP/XP
6600-8403 Ribbon Cable, MGS-550 GP/XP. Connects top and bottom PCBs
6600-8404 Accessory Kit, MGS-550 GP. Includes spare cable glands and blanking plugs, gaskets.
6600-8405 Sensing Head Common Control PCBA, MGS-550 GP/XP
Sensing Head Front End Kit, MGS-550 GP, 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.
6600-8406
Gasket
P/N
1100-0031
1100-0542
1100-0030
Gasket
Thickness
9.5 mm
6.35 mm
6.5 mm
Sensor
Type
EC
Applicable Sensor(s)
CT
CO, O
2
, SO
2
NH
3
, LPG, Methane, Propane, Butane,
Toluene/Xylene/Jet Fuels
IR CO
2
EC, SC All other sensors
6600-8407
Sensing Head Front End Kit, MGS-550 GP, No IP Rating. Includes lock nut, nosepiece without membrane, o-ring, gasket, sensor foam spacers, splash guard with calibration port. For Cl
2
, F
2
,
HCl and O
3
instruments.
1100-0034 MGS-550 IP66 Calibration Adapter
1100-0569 MGS-550 Ex d Calibration Adapter
78 P/N: 1100-1000 Version 1
MGS-550 Fixed Gas Detector
SECTION 11. DECLARATION OF CONFORMITY
NOTE: The Directives or Harmonized Standards to which this product has been evaluated may have changed. Bacharach, Inc. however continues to market this product under a presumption of conformity even though the Standards may no longer be harmonized.
P/N: 1100-1000 Version 1 79
MGS-550 Fixed Gas Detector
80
World Headquarters
621 Hunt Valley Circle, New Kensington, Pennsylvania 15068
Phone: 724-334-5000 • Toll Free: 1-800-736-4666 • Fax: 724-334-5001
Website: www.MyBacharach.com • E-mail: [email protected]
P/N: 1100-1000 Version 1
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Key Features
- Rugged ABS enclosure
- Multi-function 5-digit LED display
- Diagnostic/status LEDs
- Configurable output signal
- Independently configurable analog outputs
- Redundant sensor mapping option