You must first evaluate the gas risk in the facility. The risk assessment process is critical in both identifying the potential consequences of a gas leak to personnel, facilities and the environment and establishing the liability to the firm of a significant leak. Based upon the risk assessment you can decide what sensors are required. Second, you must evaluate the physical location to determine the number of sensors required and their placement. Qualification: The guidelines presented below

From a simple 4-point monitoring system to a complete plant wide hazardous gas monitoring system with hundreds of gas detection points, Sentry meets the need. With the Modbus communications interface Sentry can easily interface with a PC-based Distributed Control System to provide a graphical display of hazardous gas conditions in the plant. PC-based DCS software in conjunction with Sentry provides the operator enhanced data acquisition, alarming and alarm management, historical trending, distr

Milpitas, CA 95035 USA 408-262-6611, Toll Free 800-727-4377, FAX: 408-262-9042 Visit our Web Site: E-Mail: sierra@sierramonitor.com Sentry MODBUS I/O Memory Map Sentry Controller MODBUS Memory Map Detail All Registers are MODBUS 16 bit registers 2 There are five different ways of using MODBUS registers (see italic reference number in left column for each address) 2.1 As an Analog Value: In most cases these values are scaled by multiplying by 10. 2.2 As eight packed digital states, packed into on

This system is used to insure that H2S levels in natural gas collection lines remains at acceptable levels to help guard against the corrosive effects of H2S on compressors, pipelines and process equipment. It is intended for continuous monitoring prior to the addition of odorants to the gas. The Sierra Monitor Model 4400 provides the user with a low-cost, easy-to-use solution to effective monitoring of natural gas streams. This system accurately measures H2S concentration in the 0-100 ppm rang

The Model 2102 supplies the gas monitors with DC power, individual alarm relays and LED’s for visual alarm indication. An audible alarm is available on the 2102-01. The Model 20X and 200X series are fixed installation gas sensor modules designed for continuous operation in open or confined areas. The Model 20X and 200X Series gas modules consist of the Model 201 and 2001 for Combustibles, the 203 and 2003 for Hydrogen Sulfide and the Model 206 and 2006 for Carbon Monoxide. Reliable, continuous

500 mA. Battery charger feature accepts 120V AC Model 4011 14-30 VDC, Nominal 100 mA @24VDC without sensor module, 180 mA @20VDC with sensor module at 20 mA loop current ALARM LEVELS: Two alarms, user adjustable, alarm levels HiHi, HiLo, or LoLo ALARM Jumper selectable for Latching/Non- CONFIGURATION: Latching. Jumper selectable for Alarming on GREATER or LESS than Alarm Level. TROUBLE RELAY: Relay de-energizes when loop current is less than 3 mA or when power is removed. RELAY RATING: SPDT Form

Both controllers provide the user with two independent adjustable alarm levels. In addition, the output can be continuously sent to a chart recorder. The alarm relays can be programmed to be either latching or non-latching and to activate either as a rising or falling alarm. When the controller is used with 4-20 mA sensors, a third alarm provides a fault indication when the controller detects loop current less than 3 mA. The alarms are acknowledged via either an external reset switch or a reset

Available as single channel monitors or part of multipoint alarm system The Model 2050 Ammonia and Model 2060 Refrigerant/ Halocarbon Gas Monitors are continuous duty, low cost stationary monitors for detection of high levels (50-500 PPM) of ammonia and halocarbon refrigerant gases. These monitors are primarily used in and around freezers, refrigerators, and compressor rooms to warn of leaks and dangerous levels of these gases. An alarm is activated when the concentration of gas exceeds the us

The factory setpoint for R12 is 500 ppm while the setpoint for R134a is 50 ppm. See the specifications for more details. Temperature Range The Model 2050 and 2060 have temperature compensated circuitry to provide stabilization in temperatures ranging from -4o to 158oF. Semiconductor-Type Sensor 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 peri

More information on the IT Series is available in the specific IT Series data sheets. For other gases Sierra Monitor offers the 5100 Series Gas Sensor Modules described in this data sheet. Sierra Monitor toxic gas sensor modules utilize electrochemical technology to achieve the most accurate and reliable monitoring of gas concentration. All Sentry 5100 Series sensor modules easily interface to the Sentry controller. Each module has a unique address, which allows signals from multiple modules to