MSA SMC 2001-00 User manual

Operating Manual
SMC 2001-00 Gas Alarm
Document No./Revision:T10002/F3
Print Spec: 10000005389 (F)
MSAsafety.com

© MSA 2022. All rights reserved
WARNING!
Read this manual carefully before using or maintaining the device. The device will perform as designed only if it is used and
maintained in accordance with the manufacturer's instructions. Otherwise, it could fail to perform as designed, and persons
who rely on this device could sustain serious injury or death.
The warranties made by MSA with respect to the product are voided if the product is not installed and used in accordance
with the instructions in this manual. Please protect yourself and your employees by following the instructions.
Please read and observe the WARNINGS and CAUTIONS inside. For additional information relative to use or repair, call
1-800-MSA-2222 during regular working hours.
MSA is a registered trademark of MSA Technology, LLC in the US, Europe and other Countries. For all other trademarks
visit https://us.msasafety.com/Trademarks.
MSA Safety
1000 Cranberry Woods Drive
Cranberry Township, PA 16066 USA
Customer Service / Tech Support:
[phone] Option 1
Email: [email protected]
For your local MSA contacts, please go to our website www.MSAsafety.com

Contents
1 Product Description 4
1.1 Introduction 4
1.2 Application 4
1.3 Configuration 4
1.3.1 Model 2001 4
1.3.2 Semiconductor-Type Sensor 4
2 QuickStart 5
2.1 Overview 5
2.2 Wiring 5
2.3 Installation 5
2.4 Wiring Connection 5
2.5 Start-up & Operation 5
2.6 Configuration 5
3 Operation 6
3.1 Introduction 6
3.2 Alarms 6
4 Calibration 7
4.1 Factory Calibration 7
4.2 Frequency of Calibration 7
4.3 Calibration Process 7
4.4 Equipment Required 7
4.5 Calibration Procedure 7
5 Service 9
5.1 Electronics Board Replacement 9
5.2 Sensor Replacement 9
6 Installation 10
6.1 Gas Sensor Module Locations 10
6.2 Mounting 10
6.3 Wiring 10
6.4 Power Supply 10
6.5 Alarm Configuration 11
7 Specifications 13
8 Limited Warranty 14
9 Cross Gas Sensitivity Reference Chart 15
10 Replacement Parts 16
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1 Product Description
1.1 Introduction
The Model 2001-00 Gas Sensor Module is a fixed-installation, single-alarm product with a general purpose indoor
enclosure. The monitor is calibrated for Combustible Gas and includes a dry contact relay.
1.2 Application
The Module is designed for qualitative continuous area monitoring of Combustible Gas, where the gas being monitored is
not normally present.
If the equipment is used in a manner not specified by MSA Safety, the protection provided by the unit is impaired.
1.3 Configuration
1.3.1 Model 2001
A red LED (light-emitting diode) and audible 70 dB alarm activate when the concentration of combustible gas exceeds the
factory-set (and user-adjustable) level. A green LED indicator shows that power is connected and the monitor is in the safe
condition.
The standard configuration has a buzzer and normally operating open relay. This configuration can be changed by the user
(see Section 2.4 Wiring Connection).
The Model 2001 includes a AC-to-DC power supply that can be plugged into a standard AC source. The device also accepts
9-24 VDC.
The End user must use a Listed/Certified Class 2 output power source. For indoor use a Class 2 power supply is provided.
1.3.2 Semiconductor-Type Sensor
A solid-state semiconductor-type sensor and associated electronic circuitry ensure trouble-free, long-term operation. All the
electronic circuitry needed to operate the monitor, except the DC input power, is contained in a compact unit. There are no
pumps, filters, or chemical cells to replace or maintain. Except for periodic calibration to verify the alarm setting, no attention
is required after installation. The user may adjust the alarm level by applying a different calibration gas concentration.
A sensor self-check feature will flash the alarms on and off alternatively should the sensor fail (open circuit). The alarm flash
includes LEDs, audible alarm, relay and alarm signal as applicable. The alarm output oscillates to indicate sensor failure.
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2 QuickStart
2.1 Overview
The Gas Sensor Module has been supplied factory calibrated and ready for immediate installation and operation. An
installer familiar with installation and operation of gas detection products can use this section to begin immediate use of the
monitor.
2.2 Wiring
Each module requires four-conductor wiring (two wires for power and two wires for the signal). See Section 2.4 Wiring
Connection for wiring instructions.
2.3 Installation
The Model 2001 are designed to mount on any indoor vertical surface. Mount the monitor in the desired location using the
adhesive backing provided with the module or with screws through the mounting flange. All modules are shipped with the
plug-in AC/DC power supply connected to the monitor so the operator simply plugs the power supply into a nearby AC
outlet.
NOTE:Installation must be in accordance with all local codes, and/or NEC.
2.4 Wiring Connection
Terminal positions on the electronics board are as follows:
Terminal Function
TB 1-1 + VDC (9 – 24)
TB 1-2 GND (0VDC)
TB 2-1 Relay NC (Normally Closed) or Output to Model 2102 Safe
TB 2-2 Relay Common
TB 2-3 Relay NO (Normally Open) or Output to Model 2102 Alarm
NOTE:Refer to Section 6.3 Wiring for details on wiring the gas sensor module to a power supply or alarm
panel.
2.5 Start-up & Operation
To begin operation of the Gas Sensor Module, plug in the AC/DC power supply or provide 9 - 24 VDC from a regulated
power supply. Use any Listed/Certified Class 2 output power source. When the sensor module is powered up it will warmup
for 2-60 minutes.
During warm-up the monitor will cycle through the safe, alarm, then safe conditions at one hertz. This will be followed by a
short period of continuous alarm before warm-up is completed.
2.6 Configuration
The default configuration for each module is set to operate with a buzzer and a normally operating open (NOO) relay. The
user can change this configuration using the jumpers provided. Refer to Section 6.5 Alarm Configuration.
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3 Operation
3.1 Introduction
Under normal conditions the gas sensor module does not require operator or technician intervention. The following are
conditions under which the module requires attention:
• Routine periodic calibration.
• Sensor replacement on a planned schedule or when a sensor failure occurs.
• Periodic cleaning as necessary.
3.2 Alarms
Three alarm conditions are possible. These can be detected visually at the optional MSASafety controller and at the module
(externally on the Model 2001).
Warm-Up Alarm
Oscillating (On/Off) contact closure and “red/ green” visual indication when power is first connected to the module, followed
by a continuous closure of approximately 2-60 minutes indicating warm-up.
Buzzer Relay Relay Fail Safe
On/Off Oscillating Oscillating
Gas Alarm
Sustained contact closure and solid red light (once the warm-up time is completed) indicating the presence of gas at, or
above, the pre-set alarm limit.
Buzzer Relay Relay Fail Safe
On Closed Open
Trouble Alarm
Interrupted contact closure and “red/green” visual indication (once the warm-up time is completed) after unit has been in
operation, indicating either a failed sensor or calibration problems.
Buzzer Relay Relay Fail Safe
On/Off Oscillating Oscillating
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4 Calibration
4.1 Factory Calibration
The module has been factory calibrated to alarm as indicated below or as marked on the calibration tag shipped with the
module.
Model Time Gas CC/Min
2001 30 sec 1000 ppm CH4 100
4.2 Frequency of Calibration
The manufacturer recommends that the calibration of each gas sensor module be verified monthly during the first three
months of operation and then quarterly. More frequent checks are necessary during periods of extreme humidity and
temperature changes. The monitor should have operated continuously (uninterrupted) for at least 24 hours prior to
calibration adjustment.
4.3 Calibration Process
The output signal of the gas sensor module is calibrated using a calibration gas mixture containing a known concentration of
the gas of interest and a balance of air. The concentration of the span gas must be within the full scale of the sensor module
and must be equal to the alarm point desired. Default setting is 1000 ppm Methane. Use cylinder types below for other alarm
settings.
Calibration requires application of the span gas to the sensor and adjustment of the sensitivity adjustment potentiometer.
Warning:During calibration the alarm will turn on and remote alarms connected to the alarm relays will be
activated. Disable the remote alarm if necessary.
4.4 Equipment Required
The following tools and equipment will be required for calibration:
• Jewelers Screwdriver
• Calibration Gas
◦ 1260-08: 1000 ppm CH4 in Air
◦ 1260-09: 5000 ppm CH4 in Air
◦ 1260-11: 10000 ppm CH4 in Air
• Calibration gas delivery system Model # 1250-04
For accurate calibration use a gas mixture at the required concentration mixed in an air balance, rather than with an inert
gas like nitrogen. This gas and the required delivery equipment such as the Model 1250-04 Kit is available from MSA Safety.
4.5 Calibration Procedure
1. The monitor should be in the safe condition prior to calibration (green LED “ON”).
• Be sure that the area is non-hazardous before proceeding.
• Disable alarm devices
2. The sensor is in the lower right hand corner of the electronics board and the cover does not need to be removed.
3. Apply calibration gas directly to the sensor.
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4. If the monitor alarms (red LED “ON”) within one minute and stops within one minute of the removal of the calibration
gas, the monitor is in calibration and requires no adjustment.
5. If the monitor fails to alarm within one minute of the application of the gas, use a jeweler’s screwdriver to adjust the
sensitivity adjustment potentiometer (see R17 in the drawing below) clockwise until the alarm turns “ON”.
6. If the monitor fails to stop alarming within one minute of removal of the gas, adjust the potentiometer
counterclockwise until the alarm stops.
7. After adjustment, repeat the application and removal of gas to verify calibration.
8. When the calibration is complete, reconnect any alarm equipment as necessary.
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5 Service
5.1 Electronics Board Replacement
The electronics assembly should be replaced when it is determined that it is unreliable, noisy or cannot be adjusted for
calibration. This may occur due to age, corrosion or failed components.
To replace the electronics assembly:
1. Confirm that the system power has been removed.
2. Remove unit from mounting surface.
3. Remove the cover of the main enclosure by removing the two small screws on the top and bottom of the enclosure.
4. Disconnect power and signal wires from terminal strip TB1 and the wires from TB2.
5. Remove the two screws retaining the electronics board from the back of the enclosure.
6. If you are not replacing the sensor, unplug it from the electronics board.
7. Reverse the preceding steps to install the new electronics board.
8. Restore power and allow a minimum of 30-60 minutes for stabilization before recalibration if the unit was off power for
less than 60 minutes.
5.2 Sensor Replacement
The gas sensor needs replacement when:
• It is no longer possible to obtain correct calibration
• The failed sensor alarm (oscillating red/green LED) is on
• The sensor output signal is noisy, causing incorrect gas alarms
To replace the sensor:
1. Confirm that the system power has been removed.
2. Remove the cover from the main enclosure.
3. Unplug the sensor from the lower right hand corner of the electronics board.
4. Reverse the preceding steps to install the new sensor assembly.
5. Restore power and allow a minimum of 24 hours for stabilization before recalibration. The calibration should be re-
verified after 6 days of continuous operation.
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6 Installation
6.1 Gas Sensor Module Locations
The gas sensor module is a diffusion type sensor that should be located close to the anticipated source or destination of the
gas hazard. For heavier than air compounds you may place the detector within 24 inches from the ground. Place higher in
the room for lighter than air compounds.
After optimum locations are determined based on the above recommendations, consideration should be given to placing the
sensors in locations that are accessible for calibration service. Slight adjustments to the location of the sensor may have
little impact on effectivity but major effect on accessibility.
6.2 Mounting
Sensor modules should be installed on a vertical surface. The module can be mounted either using screws through the
mounting flanges or using an adhesive tape provided with the unit.
These modules are intended for use with the plug-in AC/DC power supply shipped connected to the unit. The module
should be mounted in an area convenient for the plug-in power supply.
6.3 Wiring
Interconnect wiring from the controller to the module is by 4 conductor 22 AWG (or lower AWG) cable, conduit as
necessary.
The terminal strip on the electronics board in the module. The wiring must be connected as indicated in the drawing below,
depending upon the controller or relay configuration being used.
6.4 Power Supply
The power supplied by the controlling device or an external power supply must meet the following specifications:
Voltage: 9 - 24 VDC (It must be a Listed/Certified Class 2 output power source.
Current: 250 mA
The module includes a plug-in AC/DC power supply.
Terminal Function
TB 1-1 + VDC (9 – 24)
TB 1-2 GND (0VDC)
TB 2-1 Relay NC (Normally Closed) or Output to Model 2102 Safe
TB 2-2 Relay Common
TB 2-3 Relay NO (Normally Open) or Output to Model 2102 Alarm
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