Instruction Manual
2.CAUTIONS WARNINGS & RECOMMENDATIONS
2.1INTRODUCTION
Although the sensor module is designed and con- structed for installation and operation in industrial applications including “hostile” environments, cau- tion should be taken to insure that the installation is in compliance with this instruction manual and that certain procedures and conditions are avoided.
READ AND UNDERSTAND THIS INSTRUCTION MANUAL BEFORE OPERATING OR SERVICING THIS EQUIPMENT.
2.2WIRING
Wire Gauge | Maximum Length |
20 AWG | 2,000 Ft. |
18 AWG | 3,000 Ft. |
16 AWG | 4,000 Ft. |
14 AWG | 6,500 Ft. |
12 AWG | 9,000 Ft. |
| Table 2.1 |
Recommended Wire/Cable Gauge
NOTE: Temperature rating of cable wire insulation must be above 75oC (85oC or greater rated wiring is recommended). If cable runs through higher tempera- ture environments, it should be specified for that en- vironment.
2.3 SENSOR MODULES - GENERAL
Electro magnetic and radio frequency interference to the analog communication between the sensor and the controller may occur. The manufacturer recom- mends that extra caution be taken where the installa- tion is near any sources of these interferences:
Avoid running sensor 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.
Use shielded cable in any location which may be ex- pected to be electrically noisy or where cable is ex- pected to be in close contact with AC wiring. The shield should be connected to the controller com- mon, one side only.
The wiring should be run in either a cable tray or conduit as required by applicable code and area clas- sification. Control wiring should not be installed in a cable tray or conduit with higher voltage and AC cir- cuits. See Table 2.1 for recommended wire gauge.
Wiring connections at the gas sensor module are as follows:
Wire# | Function | Terminal |
1 | Power | PWR |
2 | Signal | SIG OUT |
3 | Ground | GND |
Connect an earth ground to the ground screw pro- vided in the base of the gas sensor module enclo- sure.
All splices must be via either a lug and terminal sys- tem or soldered. Improperly spliced cable can result in corrosion, resistance changes and system errors.
Sensors should be facing down. Avoid installing sen- sor modules where they will be unnecessarily exposed to wind, dust, water (esp. direct hose down), shock, or vibration. Observe temperature range limitations.
Sensors may be adversely affected by prolonged ex- posure to certain materials. Loss of sensitivity, or corrosion, may be gradual if such materials are present in low concentrations. These materials include: Ha- lides (compounds containing chlorine, fluorine, bro- mine, or iodine), silicones, acid vapors, caustic liq- uids or vapors.
Sensor modules must not be painted. Paint may con- tain compounds which will contaminate the sensor. Paint will also cause clogging of the sintered metal cup and will cause difficulties during attachment of the calibration fitiing. The module should be tagged “DO NOT PAINT”.
When sensors are replaced the thread on the sensor housing must be lubricated with an antizieze com- pound
2.4PREVENTATIVE MAINTENANCE
DUST AND DIRT CONTROL: When calibration is performed the controller and sensors should be checked visually to determine if dust or dirt build up needs to be removed. This cleaning should be done with dry instruments such as compressed air, cloth wipes or wisk broom.
WIRING OR CABLE CONDITIONS: Any wiring or cables which are not in conduit should be checked once a year for damage to insulation or corrosion of splice or terminal points.
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