3.Testing
PROCEDURE 1:TO BE USED WHERE HIGHER READINGS ARE FOUND
IN THE GAS PHASE COMPARED TO THE LIQUID PHASE.
Step 1: Place a strip of gel or water down the vertical strip on the cylinder you chose
during CYLINDER PREPARATIONS.
Step 2: Place the sensor on the area covered with gel or water and on the UPPER
portion of the cylinder, where you are certain the sensor will be above the liquid level.
DO NOT place the sensor close to the upper weld or start of the dome, as
anomalous readings will be found.
Note: The sensor must always be positioned with the ‘TOP’ marking positioned pointing
exactly upwards. On some sensors the ‘TOP’ is marked by a simple dot. If the sensor is not
accurately placed the right way up, then anomalous readings will be found.
Step 3: Once location has been found, press CAL. A full bar graph will appear on the
Portalevel®screen, example below:
Above liquid level
Calibration must be carried out for each individual cylinder tested.
Step 4: Move sensor 5cm down, observing the bar graph.
Note:When moving the sensor, it is important NOT to slide it, as this will damage the sensor
pad, rendering the sensor inefficient and inaccurate. Remove the sensor fully and replace in
steps each time you move the sensor.
Step 5: Repeat Step 4 until the bar graph reduces and disappears (example below). In
some areas the bar graph may ‘bounce’ up and down for a few seconds. If this occurs,
simply wait for the bar graph to settle.
