RKI Instruments 01 Series Manual - Manual (Page 25)

01Series Operator’s Manual Calibration • 20
NOTE: On the OX-01, instead of 100% nitrogen (0% oxygen), it is
allowable to use higher than 0% oxygen to set the zero level. RKI
Instruments, Inc. recommends 18% oxygen or lower.
• To carry out the calibration, you will need a fixed-flow regulator with a
flow rate of 0.5 LPM (liters per minute), non-absorbent tubing, and the
calibration adapter that will fit over the 01 Series’ sensor.
Assembling the Calibration Kit
WARNING: Calibrate the 01 Series in a non-hazardous environment.
1. Attach the calibration adapter to the top of the 01 Series. The calibration
adapter opens up like a clothes pin. It fits over the 01 Series’s gas
sensor port on top of the sensor retainer and secures itself there by
clamping to the front and back of the 01 Series.
2. Attach the calibration tubing to the calibration adapter, and then attach
the opposite end of the tubing to the regulator.
NOTE: Do not attach the regulator to the gas cylinder at this time.
Setting the Span Reading (Zero Reading for OX-1)
1. Make sure you have set the fresh air reading and have set up the
calibration kit as described in the procedures above.
2. Make sure the 01 Series is off.
3. Press and hold the AIR button, and then press and hold the POWER/
MODE button. Release both buttons when you hear a “beep”. The unit
is in Calibration Mode and the LCD displays “CAL” in the lower left and
the battery level in the upper right. It also displays the gas concentration
that the unit expects you to use, the calibration value, when setting the
span.
4. If necessary, use the AIR button to adjust the calibration value to the
desired setting. The calibration value must match the gas concentration
in the calibration cylinder.
5. Press the POWER/MODE button to accept the calibration value. The
current gas reading is displayed, and “CAL” will blink in the lower left
corner of the LCD. The unit is now in Span Adjustment Mode.
If you want to cancel the calibration while in Span Adjustment Mode,
press and hold the AIR key for 3 seconds and the unit will not make any
span adjustments and begin its startup sequence.