MNA0010, Revision B October 2014
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It takes approximately 5 seconds to sweep the sensor out when zero gas is swept through the
analyzer. Then you can apply power to the analyzer. Exposure to air does not affect the life of
the sensor.
3.2.1 Two Point Calibration Design :
The model 7100P Portable analyzer has been factory calibrated using two calibration gases
and verified at several other points within the range of the unit. The factory calibrations and
verifications were made using gases with a background of Nitrogen. The model 7100P
Portable analyzer is ready for use upon removal from its shipping carton and does not have to
be calibrated (for Nitrogen background gases).
NOTE:
It is recommended to calibrate the model 7100P Portable
analyzer at regular intervals of at least once every six months. You
can calibrate using a single calibration gas however, a two point
calibration will attain the highest degree of accuracy. Additionally, to
attain the highest degree of accuracy, the model 7100P Portable
analyzer should be recalibrated for use in other background gases such as Argon or Helium.
In this case, purchase a calibration gas with PPM oxygen in the appropriate background gas.
Calibration gases are available from many specialty gas manufacturers. You may contact the
Neutronics Application Department in finding a specialty gas distributor in your area. A two
point calibration with the appropriate background gas will provide the highest degree of
accuracy. Calibration gas should be regulated to 1-3 psig at a controlled flow (1 scfm) before
entering the sensor. For single point calibrations, select a calibration gas with an oxygen
concentration in the range of 10 to 50 ppm. For a two point calibration, the second calibration
gas should be in the range of 500 to 1000 ppm oxygen.
Single point Calibration:
After the calibration gas (10-50 ppm O2) has been applied to the analyzer and the display has
stabilized, press the “MODE” button. It will display “CAL” while depressed. The Green RUN
LED will flash. After releasing the button, the display will indicate an oxygen concentration
value. Adjust the digital display to read the correct concentration of oxygen by pressing the
UP or Down arrows as required. Press the “MODE” button again to scroll past the “ALM1” ,
“ALM2”, and Fault Modes as indicated on the display.
NOTE: DO NOT CALIBRATE WITH A ZERO GAS. SETTING ZERO WILL CREATE
ERROR IN THE MEASUREMENT CALCULATIONS!
!
MODE
RUN
FAULT
ALM 1
ALM 2
9.9
T
RACE
O
XYGEN
MODEL 7100 O
2
Analyzer
Mini-Z
IRCONIA
S
ENSOR
NTRON
