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PERM 200 -17 8 .3 Sensor Functionality Testing, tial space, an alarm condition is triggered and the appropriate response is observed. 8 . 3 .1 General . Sensor functionality tests are 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 . 6 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- Verify that the console has no active or recurring cedure in this section is for the float switch type. history of leak sensor warnings or alarms . In the For other types of sensors , consult the manufac- event of any such warning or alarms, notify the turer ' s test procedures . The information presented appropriate person before continuing with the test. here should not supersede sensor manufacturers ' 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 F i positioned . Inspect the sensor for damage . Refer to the r_ manufacturer ' s literature for information about how to identify damage to the sensor housing and the cable. If it is damaged, notify the appropriate person . 8.3 .6 Test Procedure . 1. Fill the test container with the appropriate liquid. 2. Place the sensor into the liquid in the operating position . The alarm should be triggered , _ ,i 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. pei .org