Teledyne 316RA / RB / RAD / RBD - Oxygen analyzers - Manual (Page 14)

TELEDYNE ANALYTICAL INSTRUMENTS
10
Model 316RA/RB/RAD/RBD Trace Oxygen Analyzer
The analyzer should start to respond to the oxygen concentration in the
sample gas immediately. Set the range selector switch to the range that gives
you the highest resolution of the sample.
If air was not permitted to diffuse into the analyzer before the start of
sample flow, the analyzer will be ready for calibration.
Calibration
The Series 316 should be calibrated using a span gas with a known
oxygen concentration. Ambient air (20.9%) may be used for calibration,
but air calibration requires a longer cell stabilization period before the
analyzer can be used for trace analysis. This waiting period can be mini-
mized by calibrating with a span gas with a low oxygen concentration. Air
calibration is not recommended when analysis will be performed in ranges
of 0-100 ppm or less.
The analyzer can be calibrated on any range. The span gas concentra-
tion should be within 70% to 99% of full scale of the range selected.
Prior to calibration, allow the oxygen reading to come to a reasonably
stable value with zero or sample gas flowing through the analyzer.
To calibrate the analyzer:
1. Move the range selector switch to the selected calibration range.
When calibrating with air (20.9%) use the CAL setting (or the
25% range on units with a digital meter).
2. Introduce span gas into the analyzer.
3. Adjust flow to 2 SCFH.
4. Wait for the oxygen reading to stabilize.
5. Unlock and adjust the SPAN potentiometer until the meter
reads the oxygen content of the span gas, or aligns with the
CAL marking on the dial, if using ambient air to span.
For digital meters, adjust the SPAN potentiometer until the
meter reads the oxygen content of the span gas, or 20.9, if using
ambient air to span.
6. Make sure the reading is stable, and then relock the control
knob.