Bacharach MGS-460 User manual

Refrigerant Leak Detection
O/N: 1100-2293 | November 2018 Revision 0
Refrigerant Gas Detector
for Machinery Rooms, Cold Rooms & Freezers
Quick Start
Guide

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MGS-460 Quick Start Guide
Languages
This quick start guide has been translated into the following languages: Deutsch,
Español, Français, Italiano and Nederlands. To download a translated document,
scan here or visit http://bit.ly/2RSrzur.
1. Introduction
The MGS-460 refrigerant gas detector is designed for use in refrigeration applications and
may be used as a standalone device, connected to the MGS-408 controller, or connected to
a facility’s BMS / BAS. It enables compliance with refrigerant safety codes (ASHRAE 15 and EN
378) and features audible and visual alarms to alert personnel in the event of a refrigerant
leak .
2. Safety Instructions
CAUTION:Except for the maintenance detailed in this manual, this product should
ONLY be opened and / or serviced by authorized personnel. Failure to comply may
void the warranty.
WARNING:Use this product ONLY for the purposes and under the conditions
listed in the user manual. Failure to comply may result in injury and / or damage to
the product.
WARNING:The MGS-460 has not been designed to be intrinsically safe for use
in areas classied as being hazardous locations. For your safety, DO NOT use in
hazardous locations.
WARNING: Consult a qualied professional before connecting the MGS-460 to
devices not mentioned in this manual. Failure to comply may result in injury and /
or damage to the product..
DANGER: The MGS-460 is NOT certied or approved for operation in oxygen-
enriched atmospheres. Failure to comply may result in severe injury or death.

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MGS-460 Quick Start Guide
(MAG #2)
Connection Cable
(MAG #1)
Remote Sensor
CODE COMPLIANCE: Comply with all local and national laws, rules and regulations
associated with this equipment. Operators should be aware of the regulations and
standards in their industry / locality for the operation of the MGS-460.
TECHNICIAN USE ONLY:The MGS-460 must be installed by a suitably qualied technician
who will install this unit in accordance with these instructions and the standards in
their particular industry / locality. This document is 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 or death and the manufacturer will not be
held responsible in this regard.
3. Component Overview

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4. Key Specications
Trans. (H×W×D): 6.5″ × 6.5″ × 3.4″ (165 × 165 × 87 mm)
Remote (H×W×D): 4.5″ × 5.4″ × 2.7″ (115 × 136 × 68 mm)
Weight: 1.67 lbs (758 g)
Indicators: Multi-color Status LED
Internal Alarm Buzzer: 72dB @ 3.9″ (10 cm)
Alarm Delay: Congurable (0 to 15 minutes)
Inputs: Tactile Switches (×2), Magnetic Switches (×2)
Outputs: Analog Output:4 to 20 mA, 0 to 5V, 0 to 10V, 1 to 5V (default) or 2 to 10V
Bluetooth®Bluetooth®Low Energy, BLE 4.2
# COMPONENT DESCRIPTION
1M16 Cable Glands (×6)
2Rubber Gaskets (×2)
3Internal Alarm Buzzer
4Power Connections (×2)
5Digital Connection (Modbus)
6Analog Connection
7Tactile Switch #1
8Remote Sensor Connections (×2)
9Tactile Switch #2
10 Relay 3 Connection (FAULT)
11 Relay 2 Connection (HIGH)
12 Relay 1 Connection (LOW)
13 Magnetic Switch #1
14 Magnetic Switch #2
15 M20 Cable Glands (×3)
16 Ribbon Cable Connection (To Sensor)

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Modbus: Connection: RS-485 terminal block
Baud Rate: 9,600 (default) or 19,200
Data Bits: 8
Parity: None (default), odd or even
Stop Bits: 1 (default) or 2
Retry Time: 500 ms (minimum)
Power Supply: 19.5 to 28.5 VDC or 24 VAC ±20%; 4W
Wiring (Power): 2-core cable, 16 to 28 AWG
Wiring (Relays): 2-core cable, 16 to 28 AWG
Wiring (Modbus): Recommended: Belden 3106A (or equivalent) 3-core, 2 twisted pair +
ground, shielded cable with 120 Ω characteristic impedance, 16 to
28 AWG
Enclosure: Material: ABS
Protection: IP66
Temperature: Semiconductor: -40 to 122°F (-40 to 50°C)
Electrochemical: Ranges vary by gas type and / or concentration,
see the MGS-400 User Manual (P/N 1100-2294) for a full list of
temperature ranges.
Infrared: -40 to 122°F (-40 to 50°C)
Catalytic Bead: -40 to 122°F (-40 to 50°C)
Humidity: 5 to 90% RH, non condensing
Pressure: 23.6 to 32.5″Hg (800 to 1,100 mbar)
Elevation: 0 to 6,560′ (2,000 m) altitude

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STEP 1 | Mount Gas Detector & Remove Lid
WARNING: DO NOT allow the lid / sensor to hang from the ribbon cable.
Failure to comply may result in damage to the product.
5. Installation
1. Mount the MGS-460 transmitter & remote sensor according to the product
dimensions, maximum wiring lengths and following considerations:
• Environment: the full range of environmental conditions when selecting a
location.
• Application: the specics of the application (possible leaks, air movement / draft,
etc.) when selecting a location.
• Accessibility: the degree of accessibility required for maintenance purposes
when selecting a location.
• Target Gas: the specic gravity of the target gas when selecting the height of
the instrument.
2. Usinga5/32″(4 mm) hex key / allen wrench (not included) remove the lid from the
remote sensor.
3. Set the lid and rubber gasket aside to be reinstalled later.
4. Install cable into remote sensor connection and secure the cable glands.

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WARNING: Ensure that all wiring connections are made BEFORE applying
power.
WARNING: Relays are rated for 0 to 30V. DO NOT apply mains power onto
these relays.
IMPORTANT: Cable glands are meant to accommodate one cable. DO NOT
use cable glands for more than one cable.
IMPORTANT: If analog output is 4 to 20 mA, connect or short the connection
to ensure that the gas detector doesn’t go into fault.
IMPORTANT: ALWAYS ensure that all cable glands are properly tightened
and unused cable glands are plugged.
1. Locate connections (Power, Analog, Modbus, Relays) and remove terminal blocks
from the PCBA.
2. Remove plugs from the corresponding M16 cable glands and pass the cable
through the opening.
3. Securewiresineachterminalblockand,pressingrmly,reinstalltheterminal
block in the PCBA.
4. Removeallexcess cable fromthehousing before rmlysecuringthe cable
glands.
- +
Relay × 3Modbus AnalogPower × 2
STEP 2 | Wire Connections

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1. Reinstall rubber gaskets in remote sensor and transmitter.
Remote Sensor:Place inner skirt facing the main enclosure. (If the rubber gasket
doesn’t t, turn 90°.)
Transmitter: Place the side with two grooves facing the main enclosure and
the edge with two bumps on the top.
2. Reconnect the ribbon cable from the sensor to the PCBA.
3. Ensure no cables are interferring with the sensor module and close the lid.
4. Usinga5/32″(4 mm) hex key / allen wrench, tighten the lid screws in an “X”
tightening pattern:
STEP 3 | Reinstall Sensor & Connect Lid
WARNING: DO NOT leave excess cable inside of the gas detector housing.
Failure to comply may result in damage to the product.
IMPORTANT: To achieve proper seal in the IP66 version, the lid screws
should be torqued to 15 to 20 lbf in (1.5 to 2.0 Nm.

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6. Connect MGS-460 to MGS-400 App
(User Discretion)
The MGS-460 uses a smartphone application to allow users to interface with the
gas detector. To download the app, scan here or visit www.mybacharach.com/
apps.
IMPORTANT: Default alias, passkey and unlock code can be changed via the
MGS-400 App’s conguration menu.
1. Enable Bluetooth®discovery by tapping MAG #1 for 1-second. (After 10-seconds,
device will indicate that it is discoverable with audible heartbeat until it has been paired,
discovery has timed-out or has been cancelled.)
2. Launch the MGS-400 App and click the Bluetooth®icon at the bottom of the
screen to initiate a scan.
3. Select the instrument (default is “18TMA”) from the list of available Bacharach
gas detectors.
4. When prompted, enter the passkey (default is “123456”).
5. Gotoconguretabtosetupdevice.Whenprompted,enterunlockcodeto
accessdeviceconguration.(default is “1234”)
# APP DESCRIPTION
1Main Menu (App Settings)
2Status (Gas Concentration)
3Calibrate (Calibration / Bump Test)
4Details (Instrument Information)
5Disconnect Bluetooth®
6Restart Connected Device
7Test Mode (LED / Buzzer / Relays /
Analog Output)
8Device Conguration
9Logs

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7. Operation Overview
STATE
OUTPUT
LED RELAY 1 RELAY 2 RELAY 3 Buzzer
Warm-up OFF OFF OFF
Normal OFF OFF OFF
Low Alarm ON OFF OFF
High Alarm ON ON OFF
Oine OFF OFF OFF
Fault OFF OFF ON
Negative Gas Fault OFF OFF ON
Zero Cal. Fault OFF OFF OFF
Span Cal. Fault OFF OFF OFF
STATE
INPUT
MAG #1 TRAP MAG #1 HOLD MAG #2 TRAP MAG #2 HOLD
Warm-up
Enable
Bluetooth®
Connectivity
―
Disable
Bluetooth®
Connectivity
―
Normal Start Zero Cal. Start Span Cal.
Low Alarm Mute Buzzer Ack. Latched
Alarm
High Alarm Mute Buzzer Ack. Latched
Alarm
Oine ― ―
Fault Mute Buzzer Ack. Latched
Fault
Negative Gas Fault Mute Buzzer Start Zero Cal.
Zero Cal. Fault Ack. Fault ―
Span Cal. Fault ―Ack. Fault

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8a. General Calibration Procedure
WARNING: The MGS-460 MAY NOT be in an alarm or fault condition during
calibration. Acknowledge any alarms or faults BEFORE attempting to begin
the calibration process.
WARNING: Except for CO2 or O2 sensors, calibration gas must be in a
balance of air, not nitrogen (N2).
IMPORTANT: Calibration and / or bump testing requires the MGS-400
calibration adapter kit (P/N 6302-9990).
IMPORTANT: At elevations higher than 6,560′ (2,000 m), calibration will
result in a lower reading. See the MGS-400 User Manual (P/N 1100-2294) for
additional information.
1. Fit calibration adapter to the gas detector lid.
2. Ifusingavariableowregulator,adjustthegasowtoapproximately
0.3 L/min.

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8b. Zero Adjustment
WARNING: Except for CO2 or O2 sensors, ambient air may be used instead
of zero gas if the area is know to be free of the target gas or any gases to
which the sensor may be cross-sensitive.
3. Beginzeroadjustment:
MGS-400 App:Home Tab Calibrate scan barcode on gas cylinder or
manually enter values for zero gas.
Manual: hold MAG#1 for >5-seconds. The LED will blink green-green-red when
the instrument is ready.
4. Apply zero gas (or ambient air per warning above).
5. Conrmthestartofcalibration:
MGS-400 App: press the Start Zero button.
Manual: tap MAG#1 within 30-seconds or the instrument will time-out and return
to normal operation.
6. Completezeroadjustment:
MGS-400 App:app will countdown to completion. If calibration is successful,
proceed to Step 12.
Manual: the LED will blink green-red, green-red-red, green-red-red-red,
etc. until calibration is complete. To abort, hold MAG#1 for >5-seconds, turn
off gas flow and remove the calibration adapter. If calibration is successful
(green LED), proceed to Step 12. If calibration is unsuccessful (LED blinks
orange @ 2 Hz), tap MAG#1 to discard the calibration attempt and see the
MGS-400 User Manual (P/N 1100-2294) for troubleshooting.
7. Turnogasowfromzerogas.
8. Replacezerogaswithcalibrationgasinpreparationforspanadjustment.
9. Beginspanadjustment:
MGS-400 App:scan barcode on gas cylinder or manually enter values for
calibration gas.
Manual: hold MAG#2 for >5-seconds. The LED will blink green-green-orange
when the instrument is ready.
10. Apply calibration gas at the concentration listed on the cal gas concentration
label (located on top of the instrument).
8c. Span Adjustment

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Part Number
Serial Number
Sensor Type
Max Range
PN: 1100-XXXX
SN: YYMM####
GAS: CO2
10000 PPM
11.Conrmthestartofcalibration:
MGS-400 App: press the Start Span button.
Manual: tap MAG#2 within 30-seconds or the instrument will time-out and return
to normal operation.
12.Completespanadjustment:
MGS-400 App:app will countdown to completion. If calibration is successful,
proceed to Step 18.
Manual: the LED will blink green-orange, green-orange-orange, green-orange-
orange-orange, etc. until calibration is complete. To abort, hold MAG#2 for
>5-seconds, turn o gas ow and remove the calibration adapter. If calibration
is successful (LED blinks green-orange-red), proceed to Step 18. If calibration is
unsuccessful (LED blinks orange @ 2 Hz), tap MAG#2 to discard the calibration
attempt and see the MGS-400 User Manual (P/N 1100-2294) for troubleshooting.
13.Turnogasowfromcalibrationgasandremovethecalibrationadapter.
14.Allow sensor to recover / stabilize before the instrument returns to normal
operation (green LED).
IMPORTANT: The manufacturer of this product requires that a bump test or
calibration be performed following installation to verify instrument functionality.
9. Bump Test
1. Connect adapter and gas cylinder according to the instructions in the General
Calibration Procedure.

MGS-460 Quick Start Guide
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Copyright © 2018 Bacharach, Inc. All Rights Reserved
2. If desired, disable / silence external annunciators (e.g., shutdown valves,
notication of authorities, etc.):
MGS-400 App:Home Tab Calibrate Bump toggle Take Oine to disable
communications to external devices.
Manual: Inform building personnel of test so that external devices can be
disabled / silenced.
3. Applyasucientlyhighconcentrationofthetargetgastotriggeralarms,but
NOT pure refrigerant or hydrocarbons (e.g., do not use a butane lighter).
4. Once thresholds have been exceeded, relays should activate, digital outputs
should transmit the gas concentration and:
MGS-400 App:gas concentration should be displayed, the instrument status
should be “Low Alarm” or “High Alarm” and alarms states should be “On.”
Manual: LED status should display “Low Alarm” or “High Alarm.”
5. Turnogasowandremovethecalibrationadapter.
6. Allow sensor to recover / stabilize before the instrument returns to normal
operation (green LED).