Sierra Monitor Corporation 206 Specifications
Sierra Monitor Corporation 201 is an all-weather, solid-state, fixed-installation single-alarm monitor designed for continuous area monitoring of Combustible Gas. It is suitable for various applications where hazardous gases could be present, such as manholes, tanks, natural gas fields, parking garages, and vehicle maintenance facilities. The monitor features a durable, cast aluminum explosion-proof enclosure for protection against galvanic corrosion, ensuring safety in hazardous environments.
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Model 20X Series
Gas Sensor Monitors
Model 201 - Combustible Gas
Model 203 - Hydrogen Sulfide
Model 206 - Carbon Monoxide
The Model 20X Series are all-weather, solid-state, fixed-installation singlealarm monitors designed for continuous area monitoring of Combustible Gas,
Hydrogen Sulfide or Carbon Monoxide.
The Model 20X Series consists of 3 gas sensor modules, Model 201 for Combustible Gas, Model 203 for
Hydrogen Sulfide and Model 206 for Carbon Monoxide.
The monitors provide 0.5 Amp dry contract relay that is activated when the concentration of gas exceeds the factory-set (and user-adjustable) level. A TTL signal can be user configurable to interface with Sierra Monitor's alarm panels. This signal may be used to activate a remote alarm, fan or process controller.
The standard configuration has a normally operating open relay but a fail-safe normally operating closed relay is field selectable. A durable, cast aluminum explosionproof enclosure houses the sensor electronics. The enclosure provides sealing for hazardous areas - Class I,
Division 1, Groups C, D. The sensor with porous metal cover is assembled in an aluminum housing that screws directly into the electronics enclosure. The cover both protects the sensor and acts as a flame-arrestor. The monitor can be installed up to 500 feet from the power source.
Semiconductor-Type Sensor
Remote Alarm Available
If a remote alarm is desired (required for 20X-00), the
Model 2102 Dual Channel Alarm Panel can be connected up to 500 feet away from the monitors.
A solid-state semiconductor-type sensor and associated electronic circuitry ensure trouble-free, long-term operation. There are no pumps, filters, or chemical cells to replace or maintain. Except periodic calibration to verify the alarm setting, no attention is required after installation. The user may adjust the alarm level by using calibration gas with concentration equal to the alarm level.
Model 201 - Combustible Gas
The Model 201 can detect a wide range of combustibles.
Typical applications include combustible gas monitoring in manholes, tanks, natural gas fields, parking garages and vehicle maintenance facilities, sewage treatment plants, laboratories, chemical plants, and more.
Features Benefits n
Explosion-proof enclosure Can operate continuously in work areas where hazardous gases could be present n No chemical cells to replace, no periodic maintenance required other than routine calibration n
All the electronic circuitry needed to operate panel the monitor contained in a compact unit
Maintenance free operation
Quick easy installation and connection to alarm
Sierra Monitor Corporation 1991 Tarob Court Milpitas, California 95035 (408) 262-6611 (800) 727-4377 Fax: (408) 262-9042
Model 203 - Hydrogen Sulfide
The Model 203 can be used in such typical applications as wastewater treatment plants, laboratories and chemical plants.
Model 206 - Carbon Monoxide
The Model 206 Carbon Monoxide Gas Sensor Module can be used to provide an early warning of Carbon
Monoxide accumulation in tanks, laboratories, chemical plants, parking garages, vehicle test facilities and more.
SPECIFICATIONS
SENSOR TYPE:
RANGE:
Model 201
Model 203
Model 206
RESPONSE TIME:
Model 201
Model 203
Solid-State Metal Oxide Semiconductor
(at 50% relative humidity)
300 - 2,000 ppm Hydrogen
500 - 10,000 ppm Methane
10-50 ppm Hydrogen Sulfide (H
2
S)
50 - 500 ppm Carbon Monoxide (CO)
Less than 30 seconds
For 50 ppm alarm, if 50 ppm H2S is present:
1-4 minutes, if >250ppm H2S is present:
30-90 seconds
Less than 30 seconds Model 206
PERIODIC
MAINTENANCE:
OPERATING
TEMPERATURE
RANGE:
None, other than routine calibration
INPUT:
OUTPUT:
INDICATORS:
ENCLOSURE:
ENCLOSURE
MATERIAL:
SIZE:
WEIGHT:
APPROVAL:
-4°F TO 158°F
(-20°C TO 70°C)
9 - 24 VDC (+ 1V), 250 mA
0.5 amp dry contact, 100 VDC, 130 VAC
Nominal 5 volts DC (TTL), source 25mA.
SAFE and ALARM signals.
Internal LED for calibration
Class I, Division 1, Groups C, D
Cast aluminum for protection against galvanic corrosion
6.75 x 4.0 x 3.5 in
(17.1 x 10.2 x 6.0 cm)
24 oz (678 g)
UL 60950
ORDERING INFORMATION
Combustible Gas
Hydrogen Sulfide
Carbon Monoxide
201-00
203-00
206-00
2007 by Sierra Monitor Corporation Printed in U.S.A.
Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 (408) 262-6611 800-727-4377 FAX: (408) 262-9042
Visit our Web site at: www.sierramonitor.com E-Mail: [email protected]
Rev. B 8/23/07

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