RKI Instruments 01 Series Manual - Manual (Page 24)

19 • Calibration 01 Series Operator’s Manual
Calibration
This section covers the calibration of the 01 Series. Setting the fresh air
reading is described first followed by setting the span (CO-01 and HS-01)
or zero (OX-01) reading. You are also told what is needed to complete the
task and how to assemble the calibration kit.
WARNING: Use a 0.5 LPM (liters per minute) fixed flow regulator
when calibrating. Using a different flow rate may
adversely affect the accuracy of the calibration.
Calibration Frequency
The optimum frequency of calibration depends heavily on how the 01
Series is used. For example, instruments used daily may need to be
calibrated weekly or monthly, while instruments that are used only a few
times a year may need to be calibrated before each use. Typical calibration
frequencies range from monthly to quarterly. Make sure to develop a
calibration schedule tailored to your application.
Setting the Fresh Air Reading
You will need to set the fresh air reading first before setting the span (zero
for OX-01) reading.
1. Find a fresh air environment of normal oxygen content (20.9%) that is
free of toxic or combustible gases.
2. With the unit on and in Measuring Mode, press and hold the AIR button.
The LCD displays “hold” prompting you to hold the AIR button.
3. Release the AIR button when the LCD displays “AdJ”. The unit will set
the reading and return to Measuring Mode. On the CO-01 and HS-01,
the unit will set the reading to 0 ppm and on the OX-01 it will set the
reading to 20.9% oxygen
Setting the Span (Zero for OX-01) Reading
This section tells you how to set the span reading on the CO-01 and HS-01
and the zero reading on the OX-01 using Calibration Mode.
Preparation
Set the fresh air reading as described in “Setting the Fresh Air Reading.”
You will also need the supplies listed below. A calibration kit is available
from RKI Instruments, Inc. for each 01 Series model (see “Parts List”).
• A gas cylinder with an appropriate concentration of the target gas for
the CO-01 or HS-01, or a cylinder of 100% nitrogen for the OX-01.