RKI Instruments GP-01 - Manual (Page 24)

19 • Calibration Model GP-01 Operator’s Manual
• You will need a gas cylinder with an appropriate concentration of the
target gas. The Model GP-01’s calibration value must match the gas
concentration in the calibration cylinder, otherwise the calibration will
not be accurate.
CAUTION: Do not use a gas mix that includes H
2
S to calibrate the GP-01.
• 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 Model GP-01’s sensor.
Assembling the Calibration Kit
WARNING: Calibrate the Model GP-01 in a non-hazardous
environment.
1. Attach the calibration adapter to the top of the Model GP-01. The
calibration adapter opens up like a clothes pin. It fits over the Model
GP-01’s gas sensor port on top of the sensor retainer and secures itself
there by clamping to the front and back of the Model GP-01.
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 Readings for the Target Gas
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 Model GP-01 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.