866.4.Maxtec www.maxtecinc.com
3
•
For best results, perform the calibration procedure at a temperature close to
the temperature where analysis will occur.
•
Allow adequate time for the sensor to equilibrate to a new ambient temperature.
CAUTION:
“CAL Err St” may result from a sensor that has not reached thermal
equilibrium.
Pressure Effects
Readings from the N2 analyzer are proportional to the partial pressure of
oxygen. The partial pressure is equal to the concentration times the absolute
pressure. Thus, the readings are proportional to the concentration if the
pressure is held constant. Therefore, the following are recommended:
•
Calibrate the N2 analyzer at the same pressure as the sample gas.
•
If sample gases flow through tubing, use the same apparatus and flow rates
when calibrating as when measuring.
•
The N2 analyzer oxygen sensor has been tested at pressures up to two
atmospheres absolute. Calibration or operation above this pressure is beyond
the intended use.
Humidity Effects
Humidity (non-condensing) has no effect on the performance of the N2
analyzer other than diluting the gas, as long as there is no condensation.
Depending on the humidity, the gas may be diluted by as much as 4%, which
proportionally reduces the oxygen concentration. The device responds to the
actual oxygen concentration rather than the dry concentration. Environments
where condensation may occur are to be avoided since moisture may obstruct
passage of gas to the sensing surface, resulting in erroneous readings and
slower response time. For this reason, the following is recommended:
•
Avoid usage in environments greater than 95% relative humidity.
866.4.Maxtec www.maxtec.com
Summary of Contents for Handi+N2
Page 2: ......