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Manafacture: Sierra Monitor Corporation File size: 808.99 kb File name: Language of manual:

Wiring connections for power and signal interface are located on the back side of the display. 1.4.3 SENSOR ASSEMBLY The sensor assembly includes a stainless steel, explosion proof, housing containing the gas sensor and a wiring harness for connection to the transmitter. The sensor assembly threads into one hub of the enclosure. The exposed end of the sensor assembly is threaded to allow connection of a rain-shield or calibration gas delivery fitting. 1.5 INTERCONNECT WIRING Not supplied with the sensor module, but necessary to the installation and operation is the two conductor wiring shielded which connects the module to its power source and controller. Before this wiring is installed it is important to read and understand the control system installation instructions to determine wiring requirements and alternatives. 1.6 POWER REQUIREMENTS The 4501-XX module operates on DC power between 14 VDC and 30 VDC. The DC power must be supplied by the loop controller. Page 2 of 33 Figure 1-2 Model 4501-XX Hydrogen Sulfide Gas Sensor Module– Orientation Options Figure 1-1 Model 4501-05-AL or SS Hydrogen Sulfide Gas Sensor Module Model 4501-XX Toxic Gas Sensor Module 2. CAUTIONS & WARNINGS 2.1 INTRODUCTION Although the 4501-XX Gas Sensor Module is designed and constructed for installation and operation in industrial applications including hostile environments, caution should be taken to insure that the installation is made in compliance with this instruction manual and that certain procedures and conditions are avoided. This chapter discusses the necessary cautions. Read the entire chapter prior to installation of the equipment. 2.2 GAS SENSOR MODULES - GENERAL Avoid installing sensor modules where they will be unnecessarily exposed to wind, dust, water (i.e. direct hose down), shock, or vibration. Observe temperature range limitations. Sensors may be adversely affected by prolonged exposure to certain materials. Loss of sensitivity, or corrosion, may be gradual if such materials are present in low concentrations. These materials include: Halides (compounds containing chlorine, fluorine, bromine, iodine), acid vapors, caustic liquids or mists. Care has been taken by the manufacturer to ship modules in protective packaging to avoid contamination prior to installation. It is recommended that the modules remain protected during installation and that the covering be removed immediately prior to system start-up. During normal use the O2, CO, H2S, SO2 and NO2 sensors are protected from dirt and oil contamination by a sintered metal cover. If this cover becomes clogged, the response of the sensor will be reduced. Protect the sensor from contamination by careful placement, or by use of rain shields and dust shields. Sensor modules must not be painted. Paint may contain compounds which will contaminate the sensor. Paint will cause clogging of the sintered metal cover and will cause difficulties during attachment of the calibration head or other maintenance activity. It is recommended that the module be tagged "DO NOT PAINT". 2.3 WIRING The manufacturer recommends that extra caution be taken where the installation is near any sources of electromagnetic or radio frequency interference. Precautions include: . Avoid running sensor module cable close to high power cables, radio transmission lines, or cables subject to pulses of high current. . Avoid running cables near large electric motors or generators. . Analog devices require shielded cable. . In conduit installations and cable applications the shield should be connected to instrument ground. . All splices must be via either a termination hardware system or soldered. Improperly spliced cable can result in corrosion, resistance changes and system errors. NOTE Installation and wiring must be in accordance with the National Electrical Code. Voltage AC conductors are not to be run in the same conduit as voltage DC conductors. 2.4 CALIBRATION FREQUENCY The 4501-XX calibration frequency is six months (180 days). However, prudent gas detector maintenance practices normally suggest a simple recalibration following incidences of exposure to high levels of gas that would lead to alarm activation within any system utilizing the output of the gas sensor module. Page 4 of 33 Model 4501-XX Toxic Gas Sensor Module 3. QUICK START 3.1 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 module. 3.2 WIRING Provide two conductor twisted shielded wiring from the power supply/control device to the sensor module location. Use wire that is 18 AWG or larger. 3.3 MODULE INSTALLATION The 4501-XX can be mounted in a variety of configurations supported by the conduit. See figure 1-2 to determine which configuration is best for your specific application. The default configuration enables the modules to be put i...

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