PortaSens
III
Portable Gas Leak Detector, Model D16
Operation and Maintenance Manual
Rev-A Feb 2018
- 39 -
Sensor Calibration Steps
The steps required to calibrate the sensor are detailed in Table 14 below.
You may elect to perform only the zero calibration, however, if you are
planning to span, you should zero the sensor first. Calibrations are recorded
in the sensor’s calibration history, so make certain the date and time are
correct on the “Main Display”.
Make certain the date and time are correct on the “Main Display”
Table 14. Sensor calibration steps.
Description
Display
Sensor Cal Page
On the “Main Display” page, touch the “Menu”
button. Touch the “Sensor” button, and then touch
the “Calibrate” button. This will present the
“Sensor Cal” page, as shown on the right. The
target gas name, units of measure, and “un-
blanked” gas reading appear on this page so that
you may double-check your gas source, and watch
for a stable reading. The page is displayed for at
least 30 minutes without touching the display
(longer if the “Menu Timeout” setting is greater than
30 minutes). This is normally enough time for a
zero or span calibration.
Zero Calibration
Navigate to the “Sensor Cal” page (above).
Expose the sensor to a gas source known to be
free of the target gas, and any interfering gases
(see Gas Interferences on page 44).
For toxic gas sensors, this is usually atmospheric
air, but may be bottled “Zero Air”, or Nitrogen. For
O
2
sensors, Nitrogen is required. Nitrogen is
usually stored in a pressurized bottle or cylinder, so
refer to Pressurized Gas Sources on page 38 for
details about connecting it.
When the reading has stabilized at its lowest value
(usually less than 4 minutes), and is not 0, touch
the “Zero” button. “Ok” will appear be low the gas
reading for 2 seconds, and the reading will change
to 0.