Bacharach MGS SERIES User manual

Multi-Channel Input
Single- and Dual-Alarm
Controllers
Installation and Operation Manual
Instruction 6709-9000
Revision 1 – October 25, 2012
Product Leadership •Training •Service •Reliability

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WARRANTY POLICY
BACHARACH, INC. WARRANTS THIS INSTRUMENT, EXCLUDING SENSORS, TO BE
FREE FROM DEFECTS IN MATERIALS AND WORKMANSHIP FOR A PERIOD OF ONE
YEAR FROM THE DATE OF PURCHASE BY THE ORIGINAL OWNER. THE SENSORS
HAVE A WARRANTY PERIOD OF ONE YEAR FROM THE DATE OF PURCHASE. 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 BACHARACH, INC. AT THE FOLLOWING ADDRESS.
BACHARACH, INC.
621 HUNT VALLEY CIRCLE
NEW KENSINGTON, PA 15068
ATTENTION: 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.

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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
COPYRIGHTS: 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 WHICH BACHARACH UTILIZES AND/OR DISTRIBUTES, HOLDS A
PROPRIETARY INTEREST AND IS ALSO SUBJECT TO COPYRIGHT PROTECTION
AND 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.
TECHNICIAN USE ONLY
THIS UNIT MUST BE INSTALLED BY A SUITABLY QUALIFIED TECHNICIAN WHO WILL
INSTALL THIS UNIT IN ACCORDANCE WITH THESE INSTRUCTIONS AND THE
STANDARDS IN THEIR PARTICULAR INDUSTRY/COUNTRY. OPERATORS OF THE
UNIT SHOULD BE AWARE OF THE REGULATIONS AND STANDARDS IN THEIR
INDUSTRY/COUNTRY FOR THE OPERATION OF THIS UNIT. THESE NOTES ARE
ONLY INTENDED AS A GUIDE AND THE MANUFACTURER BEARS NO
RESPONSIBILITY FOR THE INSTALLATION OR OPERATION OF THIS UNIT.
FAILURE TO INSTALL AND OPERATE THE UNIT IN ACCORDANCE WITH THESE
INSTRUCTIONS AND WITH INDUSTRY GUIDELINES MAY CAUSE SERIOUS INJURY
INCLUDING DEATH AND THE MANUFACTURER WILL NOT BE HELD RESPONSIBLE
IN THIS REGARD.
HAZARDOUS AREA WARNING
THIS INSTRUMENT HAS NOT BEEN DESIGNED TO BE INTRINSICALLY SAFE FOR
USE IN AREAS CLASSIFIED AS HAZARDOUS LOCATIONS. FOR YOUR SAFETY, DO
NOT USE IT IN HAZARDOUS (CLASSIFIED) LOCATIONS.

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Table of Contents
SECTION 1. INTRODUCTION ........................................................................5
1.1. OVERVIEW .................................................................................................. 5
1.2. 2-CHANNEL AND 6-CHANNEL MODELS ............................................................. 5
1.3. ALARMING .................................................................................................. 5
1.4. COMPONENTS.............................................................................................. 8
1.5. SPECIFICATIONS.......................................................................................... 11
SECTION 2. MOUNTING INSTRUCTIONS ....................................................12
2.1. INSTALLATION WARNINGS ............................................................................ 12
2.2. LOCATION RECOMMENDATIONS .................................................................... 12
2.3. MOUNTING DIMENSIONS ............................................................................. 13
SECTION 3. WIRING................................................................................... 16
3.1. 1- AND 2-CHANNEL UNITS (SINGLE-AND DUAL-ALARM) ................................... 16
3.2. 4- AND 6-CHANNEL UNITS (SINGLE-AND DUAL-ALARM) ................................... 17
3.3. EXTERNAL HORN (FOR AUDIBLE ALARMS) ....................................................... 20
SECTION 4. CONFIGURATION AND OPERATION ........................................ 21
4.1. OVERVIEW ................................................................................................ 21
4.2. INTRODUCTION TO CHANGING ALARM LEVEL(S) ............................................... 21
4.3. CHANGING ALARM LEVEL FOR 2-CHANNEL,1-ALARM UNITS .............................. 23
4.4. CHANGING ALARM LEVEL FOR 2-CHANNEL,2-ALARM UNITS .............................. 24
4.5. CHANGING ALARM LEVEL FOR 6-CHANNEL,1-ALARM UNITS .............................. 25
4.6. CHANGING ALARM LEVEL FOR 6-CHANNEL,2-ALARM UNITS .............................. 26
4.7. OUTPUT DELAYS......................................................................................... 27
4.8. FAIL SAFE OPERATION ................................................................................. 28
4.9. MUTING THE AUDIBLE ALARM (KEY SWITCH)................................................... 29
4.10. RESETTING HIGH ALARMS (DUAL-LEVEL UNITS ONLY)..................................... 29
DECLARATION OF CONFORMITY ..................................................................30

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Section 1. Introduction
1.1. Overview
The MGS Series controllers provide local alarm status indications (via
multi-colored, per-channel LEDs) as well as single-level or dual-level
digital (relay) alarm outputs based on 1, 2, 4, or 6 input signals and 1 or
2 user-definable set-points.
1.2. 2-Channel and 6-Channel Models
MGS Controllers support multiple input sensors/transmitters (1, 2, 4, or 6
channels) based on the model of the controller. Inputs are standard 4-20
mA signals from MGS-series sensors or any standard, linear, 4-20 mA
transmitter.
NOTE: The smaller MGS Controller supports up to two input
channels (see Figure 1). The larger controller supports up to
six channels (see Figure 2). The number of alarm LEDs on
your controller will vary based on the flavor of device that is
ordered (see Figure 3).
IMPORTANT: If you are NOT using the maximum number of
available channels (2 for the smaller controller, and 6 for the
larger controller), you must connect a 3300 Ω resistor across
pins 1 and 2 for each unused input channel.
1.3. Alarming
Regardless of the number of channels supported, each controller
contains either 1 or 2 adjustable potentiometers (pots) for setting the
alarm value(s). Single-level alarm controllers contain one pot which sets
the controller’s alarm threshold. Dual-level alarm controllers contain two
pots which are used to set the low-level and high-level alarm thresholds.
As an individual channel’s input signal exceed the controller’s alarm
threshold (set by the programmable pot(s)), the corresponding channel’s
alarm LED is illuminated, allowing a technician to visually inspect the
controller for any alarm conditions on a channel-by-channel basis. Refer
to Figure 3.

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Figure 1. Sample Configurations (1,2-Channel)

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Figure 2. Sample Configurations (4,6-Channel)
MGS Controllers have either one or two relay outputs: one for single-
level alarm controllers (“Alarm”), and 2 for dual-level alarm controllers
(“Alarm High” and “Alarm Low”). Unlike the alarm LEDs that provide a
channel-by-channel alarm status of each incoming transmitter’s signal,
the relay output “trips” or “energizes” if any of the inputs exceed the
alarm threshold set by the pot (that is, if any of the alarm LEDs is
energized). Alarm relays can be used to activate warning lights, sirens,
ventilation fans, etc.

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Figure 3. Sample Front Panels Showing Status LEDs
For dual-alarm configurations, the Alarm Low relay output “trips” or
“energizes” if any of the inputs exceed the alarm threshold set by the low
alarm pot. Similarly, the Alarm High relay output “trips” or “energizes” if
any of the inputs exceed the alarm threshold set by the high alarm pot.
All controllers have a green power LED that is on when the unit has
power. The 4- and 6-channel 2-level units have a fault relay which “trips”
or “energizes” if the controller experiences a fault condition. Like the
alarm relays, the fault relay can be use to activate warning lights, sirens,
ventilation fans, etc.
1.4. Components
The following is a summary of the MGS Controller’s hardware
components. Note that features vary based on model and features (e.g.,
1-2 channel units vs. 4-6 channel units, single-level alarms vs. dual-level
alarms, etc.).

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Components Descriptions
Power input Provides power to the MGS Controller
Power LED Power status indicator
Channels (max) 1-2 Channel Units 4-6 Channel Units
Sensor input(s) max 2 max 6 max
Alarm levels Single Dual Single Dual
Set point POT(s) 1 2 1 2
Alarm relay output(s) 1 2 1 2
Alarm LED(s) (max) 2 4 6 12
Fault relay output N/A N/A N/A 1
Figure 4. 6-Channel, Dual-Alarm MGS Controller

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NOTE: Figure 4 shows components associated with a dual-
alarm configuration. For single-alarm configurations, the Low
Alarm LEDs are not present. JP1 on the single-alarm
configuration is the delay jumper.
Figure 5. 2-Channel, Dual-Alarm MGS Controller
NOTE: Figure 5 shows components associated with a dual-
alarm configuration. For single-alarm configurations, the Low
Alarm LEDs are not present, and the Delay Jumper will be
present. The Delay Jumper is not available on dual-alarm
configurations, though its location is highlighted above.

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1.5. Specifications
Specification 1-2 Channel 4-6 Channel
Product Type 1-2 channel alarm
controller 4-6 channel alarm controller
Max Channels 2 6
Inputs 4-20 mA 4-20 mA
Display LED alarm indicators LED alarm indicators
Ambient
Temperature
Range
-20 to +50 degrees C -20 to +50 degrees C
Power Supply <20W
Specify at time of order:
•110 VAC (60 Hz)
•240 VAC (50 Hz)
•12 VDC
<20W
Specify at time of order:
•110 VAC (60 Hz)
•240 VAC (50 Hz)
•12 VDC
Audible Alarm Integrated 12 VDC
Alarm Set
points User selectable. Common to all channels.
Alarm level set point is
based on 4-20 mA input
signal.
User selectable.
Common to all channels.
Alarm level set point is
based on 4-20 mA input
signal.
Alarm Relays One 10-A 30 VDC or
250 VAC resistive Form
C relay. Two for dual-
alarm configurations.
Common low alarm and
high alarm across
channels.
One 10-A 30 VDC or
250 VAC resistive Form
C relay. Two for dual-
alarm configurations.
Common low alarm and
high alarm across
channels.
Common fault relay on
dual-level alarm
configurations.
Housing NEMA 1 wall mount NEMA 1 wall mount
Approvals UL/CSA/IEC/EN 61010
(Pending) UL/CSA/IEC/EN 61010

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Section 2. Mounting Instructions
2.1. Installation Warnings
WARNING: Explosion hazard! Do not mount the MGS
Controller in an area that may contain flammable liquids,
vapors, or aerosols. Operation of any electrical equipment in
such an environment constitutes a safety hazard.
CAUTION: The MGS Controller contains sensitive electronic
components that can be easily damaged. Do not touch nor
disturb any of these components.
NOTE: The mounting location of the MGS Controller should
allow it to be easily accessible for visual monitoring and
servicing.
NOTE: The MGS Controller must be connected by a marked,
suitably located and easily reached switch or circuit-breaker
as means of disconnection.
NOTE: Connect power and signaling terminals using wiring
that complies with local electrical codes or regulations for the
intended application.
CAUTION: The MGS controller contains sensitive electronic
components that can be easily damaged. Do not touch nor
disturb any of these components
2.2. Location Recommendations
NOTE: The MGS Controller should be installed plumb and
level and securely fastened to a rigid mounting surface.
At a minimum, the MGS Controller must be located within the
appropriate wire lengths from the sensors being monitored. In addition,
consider environmental conditions and accessibility. Refer to Section 3
for more information on sensor wiring lengths.

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Sensors must be located within the appropriate wire lengths from the
central control unit (if used).
In all cases the sensor supplied is designed for maximum sensitivity to a
particular gas. However, in certain circumstances false alarms may be
caused by the occasional presence of sufficiently high concentrations of
other gaseous impurities. Examples of situations where such
abnormalities may arise include the following:
•Plant room maintenance activity involving solvent or paint fumes
or refrigerant leaks.
•Accidental gas migration in fruit ripening/storage facilities
(bananas - ethylene, apples - carbon dioxide).
•Heavy localized exhaust fumes (carbon monoxide, dioxide,
propane) from engine-driven forklifts in confined spaces or close
to sensors.
Bacharach recommends setting the alarm delay to minimize false
alarms. See Section 4.7 for more information.
2.3. Mounting Dimensions
The controllers contain a single teardrop cutout at the top center of the
enclosure. Two smaller holes are located in the bottom corners of the
enclosure. Refer to the mounting dimension figures that follow.
Each enclosure base provides a ½” standoff from the mounting surface
to allow use of a power line knockout in back of enclosure base. Power
wiring may also enter the enclosure via one of the input holes on the
bottom of the enclosure.

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Figure 6. Mounting Dimensions (2-Channel Unit)

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Figure 7. Mounting Dimensions (6-Channel Unit)

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Section 3. Wiring
3.1. 1- and 2-Channel Units (Single- and Dual-Alarm)
Wiring to Sensors/Transmitters
Controller
Terminal Block Controller Pin Number Signal Sensor/ Transmitter
CN1 1 +Ve supply +V in 2 4-20 mA signal 4-20 mA out
4 -Ve input GND in
CN2 1 +Ve supply +V in 2 4-20 mA signal 4-20 mA out
4 -Ve input GND in
Figure 8. Wiring (2-Channel, Single-Alarm Unit Shown)

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NOTE: The potential from -Ve to +Ve is approximately
15 VDC.
Figure 9. Wiring (2-Channel, Dual-Alarm Unit Shown)
3.2. 4- and 6-Channel Units (Single- and Dual-Alarm)
Wiring to Sensors
Controller
Terminal Block Controller Pin Number Signal Sensor/ Transmitter
CN1 – CN6 1 +Ve supply +V in 2 4-20 mA signal 4-20 mA out
4 -Ve input GND in

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Figure 10. Wiring (6-Channel, Single-Alarm Unit Shown)

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Figure 11. Wiring (6-Channel, Dual-Alarm Unit Shown)
NOTE: An external horn is provided with 4- and 6-channel
units. Refer to the next section for details.

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3.3. External Horn (for Audible Alarms)
Horn Specifications (Test Conditions at 25°C)
Specification Description
Housing Black ABS
Power Rating 10 W (RMS), 15 W (peak)
Voltage 12 VDC (Rated), 6-16 VDC range
Current 200 mA max (@ 12 VDC)
Sound Pressure Level Minimum 100 dB at 1 meter (@ 12 VDC)
Connections Red: +12 V, Black: Ground
Weight 2.3 ±0.2 oz (65 ±5 g)