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warmed up under clean air environment. When the system is first switched <br />on, the initial warm-up period would activate the alarm. If the alarm <br />continues for more than one hour, then it is quite possible that the <br />monitoring environment has already been contaminated with certain toxic <br />gas or hydrocarbons. To verify whether the alarm is caused by contaminant <br />species, simply remove the vapor sensor from the well, and place it in clean <br />air; if the alarm continues, then the setting is too sensitive and hence, should <br />be readjusted. On the other hand, if the alarm stops, then it confirms that, <br />indeed the monitoring well has already been contaminated. Under this <br />condition, a thorough inspection of the field should be launched to seek the <br />cause and magnitude of the contamination, and contact the proper <br />authorities to determine the necessary clean-up efforts. <br />The alarm trimpot may be adjusted clockwise to increase the sensitivity, or <br />counter -clockwise to decrease the sensitivity. An overly sensitive setpoint <br />may be subject to background noise effect and causing nuisance false alarms. <br />Under normal condition (i.e., the field is not contaminated) it is <br />recommended to adjust the setpoint to approximately 1% to 2 turns <br />counter -clockwise back off from the alarm point. <br />IV.23. Alarm Test Switching <br />On the cover of the panel housing are two push-button switches marked <br />LIQUID and VAPOR. These switches are for functional tests of the alarm <br />circuits. <br />When the LIQUID • the alarms of • <br />channels will be activated. Similarly, the alarms of the vapor channel will be <br />activated when the VAPOR test switch is • 4-d <br />Analog Output•justments (For Channel Equipped with Analog • • <br />Option Only) <br />The ZERO and SPAN trimpots are for adjustments of baseline and <br />sensitivity, respectively. <br />Possible causes and remedies: <br />a. Power Switch Not Turned On: Make sure the power switch is in ON <br />position. <br />b. AC power is connected properly: The 115VAC hot and neutral <br />power inputs should be wired to the terminals marked "115VAC." <br />C. Fuse is broken. Check the fuse continuity and replace it if needed. <br />2 Vapor Alarm Stays Activated All The Time <br />Possible causes and remedies: <br />a. Vapor Present in the Well: Remove the sensor from the probe well; <br />if the alarm stops, then it indicates a presence of vapor. <br />_10— <br />IG <br />