Pro He
TM
Alarm Helium Analyzer
NUVAIR
Page
8
www.nuvair.com
2.6. Flow Adapter Cap
The Analyzer includes a Flow Adapter Cap with flexible tubing and flow orifice. It attaches to the
Sensor port and is sealed by an o-ring. It can be used to direct the gas sample flow to the
Sensor via one of two methods:
Flow to the sensor needs to be restricted to .5-1liter. Increased flow will create faulty readings.
Nuvair offers flow restrictors to accomplish this task. See appendix.
3.0 Calibration
Analyzer calibration must be verified on a weekly basis. Improper calibration may result
in an incorrect reading, exposing the user to dangerous levels of Helium. Exposure to
Helium can lead to unconsciousness and death.
This Analyzer must always be checked against a calibration gas and used with gases
regulated and supplied at atmospheric pressure (0 P.S.I.). Use of gases at higher
pressures may result in incorrect readings and may damage the Analyzer. Incorrect
readings may expose the user to high levels of carbon Dioxide resulting in personal
injury or death.
Checking Calibration or use of the Analyzer with a low battery may result in inaccurate
readings. Inaccurate gas analysis can lead to serious personal injury or death.
If the Analyzer has been subjected to a recent change in ambient temperature, allow it to
stabilize for one hour before checking calibration.
Verify calibration on a weekly basis. Breathing gas applications require the use of a certified He
calibration gas and flow rate of 0.5-1 L/min. The equipment to produce this flow is available
from Nuvair. See Spares and Accessories section. To assure the greatest accuracy for other
applications, use the calibration gas concentration closest to the expected concentration in the
gas being measured.
Should the unit begin to display readings other than the helium percentage of the calibration test
gas, perform a Factory Reset as outlined in Section 7.
Sample Flow Method
Flow is Delivered from
Low Pressure Source
via Flexible Tubing
Direct Flow Method
Flow is Directed to
Flow Orifice on Face
of Flow Adapter Cap
Vent Hole
