3.2.1.1 Step-1: Select the Calibration Gas
The following calibration gas can be used to calibrate the model 1100:
• Ambient air
• Instrument grade compressed air (Dew-point < 35°, particulates < 3-micron,
condensable hydrocarbons < 1-part-per-million)
• Certified standard grade bottled gas at 20.9% oxygen concentration
WARNING Do not calibrate the model 1100 using zero gas. If the unit is calibrated on zero gas, it
will not operate properly.
3.2.1.2 Step-2: Remove the Oxygen Sensor from On-line Service
The oxygen sensor requires removal from on-line service prior to calibration. Calibration or other
maintenance of the model 1100 analyzer and sensor should be performed only when the
measured process is not operating. If the unit has been installed with a Neutronics process sample
conditioning system, please refer to the equipment manual for the sampling system for detailed
instructions.
WARNING Before opening any part of the sampling system to air, make sure that the sampling
lines are not pressurized and are clear of any gas that may create a personnel or environmental
hazard.
Disconnect the measured process from the sensor by completely removing the installed 1/8"
MNPT fittings from the sensor flow-through head sample inlet port (this step is not necessary if you
are using a fixed gas manifold – see section 2.3.1). If it is necessary to exhaust the gas to an
alternate path during calibration, completely remove the installed 1/8" MNPT fittings from the
sensor flow-through head sample exhaust port. Connect the oxygen sensor to an alternate
exhaust location as shown in section 2.1.2.3.
3.2.1.3 Step-3: Calibration – Apply calibration gas to the Oxygen Sensor
Attach a calibration gas source with 20.9% oxygen concentration to the model 1100 sensor flow-
through head. The user may attach the regulated gas source to the sensor head sample inlet port
directly or through a fixed gas manifold. The latter method will help to prevent premature wear of
tube-ends and fittings and increase long-term sampling system integrity. Where a calibration
manifold has not been installed, connect the calibration gas source to the oxygen sensor similar to
the configuration shown in section 2.1.2.2.
Apply the calibration gas to the oxygen sensor. Adjust the regulated calibration gas pressure to
match the pressure of the in-service sample gas, in accordance with the specification (1 to 3 psig,
see Appendix B). Be sure to flow the calibration gas to the sensor until the analyzer display has
stabilized, allowing the calibration gas to sweep out the sample lines. The optimum flow rate is 1
SLPM.
WARNING Never apply an unregulated gas supply to the oxygen sensor. High or uncontrolled
pressures may cause damage the oxygen sensor and sampling system components and may be
harmful to personnel.
To Next Page
Loading...