RKI Instruments Gas Tracer - Manual (Page 70)

62 • Calibration Mode Gas Tracer Operator’s Manual
Calibration/Bump Test Supplies and Equipment
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.
• A demand-flow regulator to provide adequate sample gas flow
• Non-absorbent tubing
• Humidifier tube (for calibration of ppm sensor)
CAUTION: If you are using a calibration kit that includes a gas bag and a
fixed flow regulator or dispensing valve, do not apply gas
directly to the Gas Tracer with the regulator or valve or damage
to the pump will result. See “Appendix A: Calibrating or Bump
Testing with a Sample Bag” on page 193 for instructions to
properly use a gas bag kit.
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 section includes
instructions for auto calibration and bump testing with a demand-
flow regulator, a 3-gas cylinder, and a %volume methane cylinder.
This section 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 Test
Whether you will calibrate the Gas Tracer using auto calibration or
single calibration or perform a bump test, you will need to set the
fresh air readings first.
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,
Normal Mode Only” on page 20 or “Turning On the Gas Tracer in
Normal Mode With All Modes Active” on page 26. Use the sample
hose and probe.