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Instruction Manual 0 1.1 Introduction The Sierra Monitor Gas Sensor Modules con- sist of two series of fixed -installation, single - alarm products, the 20X Series is an explo- sion proof outdoor model, and the 20OX Se- ries is in a general purpose indoor enclo- sure. Both series include monitors for Com- bustible Gas, Hydrogen Sulfide, and Carbon Monoxide. Both series also include a dry contact relay. See Table 1.1 for a full list of available configurations. This manual provides instructions for both 20X and 20OX series Gas Sensor Modules. The Gas Sensor Modules are designed for qualita- tive continuous area monitoring of Combustible Gas, Hydrogen Sulfide or Carbon Monoxide where the gas being monitored is not normally present. If the equipment is used in a manner not specified by Sierra Monitor Corporation, the protection pro- vided by the unit is impaired. 1.3 Configuration 1. Model 20X Series The Model 20X series consists of three sepa- rate gas modules, Model 201 for Combustibles, Model 203 for Hydrogen Sulfide and Model 206 for Carbon Monoxide. An alarm signal is acti- vated when the concentration of gas exceeds the factory -set (and user -adjustable) level. The signal may be used to activate a remote alarm, fan or process controller. HUB FOR 314" CONDUIT 10.0cm 43" ❑ O c a01N 13.San ❑ ® -111N DIA .3121N (2X) L SENSOR 1( ASSEMBLY Figure 1.1 Outline View - 20X Series Contact Sierra Monitor for specifics on the de- vices that can be interfaced with these gas sen- sor modules. In addition, all versions include, as standard, a 0.5 amp, dry contact relay, which can be configured as normal operating open or fail safe, normally operating closed. A durable, cast aluminum explosion -proof en- closure houses the sensor electronics. The enclosure provides sealing for hazardous areas - Class I, Division 1, Groups C, D. The sensor with a porous metal cover is assembled in an aluminum housing that screws directly into the electronics enclosure. The cover protects the sensor and acts as a flame -arrestor. The moni- tor can be installed up to 500 feet from the re- mote power source. Model Gas Outdoor Indoor TTL Relay 201-00 Combustibles X X X 203-00 H2S X X X 206-00 CO X X X 2001-00 Combustibles X X X 2003-00 H2S X X X 2006-00 CO X X X Table 1.1 Gas Module Configurations Buzzer X X X Page:1 20X/20OX Gas Sensor Modules (08/04)