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IN) PEURNI200-17 8.3 Sensor Functionality Testing, tial space, an alarm condition is triggered and the 8.3.1 General. Sensor functionality tests are appropriate response is observed. used to confirm the operation of the liquid detect- 8.3.4 Test Equipment. Test equipment shall ing sensors that are located in the interstitial spaces include: of UST systems.Sensors that detect the presence of . a test container to immerse the sensor; liquid are placed at the lowest point of the contain- ment so that any release that drains down will be . water; detected. Discriminating sensors can identify the . product(if appropriate). presence of liquid product or water. Nondiscrimi- nating sensors can only determine the presence of 8.3.5 Preparation. Review the sensor manu- liquid—product or water—but cannot discriminate facturer's literature for testing guidelines. Use the between the two.Sensors are connected to the leak- manufacturer's guidelines if they differ from the monitoring console, which provides a warning if procedures in this section. liquid is detected.Sensor and console features may vary among manufacturers. NOTE:Some sensors are programmed to have positive shutdown when the sensor goes into There are a number of types of sensors in use in alarm mode. For these systems, ensure that the field, including float switches, optical sensors, the dispensing system shuts down when the pressure/vacuum monitoring devices and electrical sensor alarms. resistance sensors. The most common sensor type in use is a float switch.Consequently,the test pro- cedure in this section is for the float switch type. Verify that the console has no active or recurring Fhistory of leak sensor warnings or alarms. In the For other types of sensors, consult the manufac- turer's test procedures. The information presented event of any such warning or alarms, notify the here should not supersede sensor manufacturersappropriate person before continuing with the test. testing procedures and requirements. Verify on the console that the sensor alarm circuit 8.3.2 Purpose. The purpose of the test is to is operational. determine if a sensor can detect the presence of If the console is equipped with a printer,print out liquid and is properly positioned.It can be used for the system status, sensor configuration and any either discriminating or non-discriminating sen- alarm histories from the console. Save the printout sors. for facility records. 8.3.3 Description of Test. The liquid detecting Carefully remove the sensor from the containment sensor is removed from the tank or piping intersti- area. This may produce an alarm on the console indicating that the sensor is no longer properly positioned. Inspect the sensor for damage. Refer to the manufacturer's literature for information about how to identify damage to the sensor housing and sr the cable. If it is damaged, notify the appropriate r person, 8.3.6 Test Procedure. ' 1.Fill the test container with the appropriate liquid. Place the sensor into the liquid in the operating position.The alarm should be triggered, 3.Verify the alarm condition and make sure FIGURE 8-3. The sensor needs to be properly posi- the sensor label is correctly identified on the tioned to detect the presence of liquid in sumps. 0 peLorg