RKI Instruments Gas Tracer - Manual (Page 202)

194 • Preparing for Calibration or Bump Testing Gas Tracer Operator’s Manual
To calibrate or bump test the Gas Tracer, you will need:
• Known calibrating samples of the gases being detected. The
combustible and toxic gas samples should have concentrations in
approximately the middle of the range of detection. An oxygen-
free source, such as 100% nitrogen is recommended for setting the
oxygen zero when using single calibration.
WARNING: When using auto calibration, the multi-gas cylinder
must have an oxygen concentration in the range of 10% -
18% oxygen.
• A gas collection bag with hose clamp
• A 0.5 LPM fixed-flow regulator or dispensing valve
• Non-absorbent tubing
• 6 inch humidifier tube (for ppm calibration)
To calibrate the %LEL, Oxygen, and CO sensors at the same time,
automatically, with no need for a zero-oxygen source, you can use the
auto calibration feature with a 3-gas cylinder. This appendix includes
instructions for auto calibration with a fixed flow regulator or
dispensing valve, a 3-gas cylinder, and a %volume methane cylinder.
This document also includes instructions for calibrating one channel
at a time using single calibration.
NOTE: If the combustible gas channels are calibrated to a gas other
than methane, use an appropriate multigas cylinder or use
single calibration to calibrate the combustible channels.
Preparing for Calibration or
Bump Testing
Perform the following tasks prior to performing a calibration or a
bump test.
Normal Operation Fresh Air Adjustment
Whether you will perform an auto calibration, a single calibration, or
a bump test on the Gas Tracer, you will need to set the fresh air
readings first before setting the span readings for each gas.
1. Find a fresh-air environment. This is an environment free of toxic
or combustible gases and of normal oxygen content (20.9%).
2. Turn on the unit as described in “Turning On the Gas Tracer,