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b. Alarm Setpoint Too Sensitive: If the vapor alarm continues -,outside <br />the probe well, then adjust the setpoint trimpot counter -clockwise <br />until the alarm stops. (See section IV.2.2 Vapor Alarm <br />Adjustments.) <br />C. Vapor Sensor Failure: If vapor alarm continues even after the VADJ <br />trimpot has been turned counter -clockwise all the way, disconnect <br />the white sensor wire from the safety barrier ZSB-2; if the alarm <br />stops, then it indicates a short circuit in the sensor. <br />d. Channel PC Card Failure: If after the above three check-up <br />procedures, the alarm still continues, then it indicates a malfunction <br />in the PC card. If the unit is equipped with more than one channel <br />PC card, then check by exchanging it with another PC card, and <br />contact the factory or authorized service agent for replacement. <br />a Vapor Alarm Fails to Activate when "Vapor" Test Switch is Pressed <br />Possible causes and remedies: <br />a. Improper Alarm Setpoint Adjustment: Adjust the VADJ trimpot <br />clockwise to increase the sensitivity (See Section IV.2.2.. Vapor <br />Alarm Adjustment.) <br />b. Channel PC Card Failure: If the vapor alarm fails to respond to the <br />trimpot adjustment, then the problem might be with the channel PC <br />card Check by replacing it with PC card from another channel if <br />available, and contact the factory or authorized service agent for <br />replacement. <br />41, Liquid Alarm Stays Activated All the Tims <br />Possible causes and remedies: <br />a. Liquid -Present: Check the probe well to verify whgther the sensor is <br />in contact with liquid. <br />b. Open Circuit in Liquid Sensor Circuit: Check to make sure the <br />liquid sensor circuit is properly connected. (NOTE.- If the channel <br />has no liquid sensor, then one of the following steps must be taken <br />to avoid liquid alarm: (i) Turn the LAW trimpot counter -clockwise <br />until the liquid alarm disappears, or (ii) Connect the GREEN wire <br />to one of the Ground Terminal Block contacts.) <br />C. Trimpot Adjustment Too Sensitive: Turn the LAW trimpot <br />counter -clockwise to decrease sensitivity. <br />d Channel PC Card Failure: If none of the above, then the trouble <br />could be due to the PC card malfunction. Consult the factory or <br />authorized service agent for replacement. <br />—11— <br />