RKI Instruments GD-K11D - Manual (Page 25)

Model GD-K11D Operator’s Manual Calibration • 21
Calibration
This section describes how to calibrate the Model GD-K11D. It includes procedures to
prepare for calibration, set the zero reading, set the response (span) reading, and return to
normal operation.
WARNING: The Model GD-K11D is not an active gas monitoring device during the
calibration procedure.
Preparing for Calibration
NOTE: This procedure describes calibration using the RKI calibration kit that includes a
“demand flow” regulator. A calibration kit that uses a gas collection bag is also
available. Contact RKI Instruments, Inc., for more information concerning the
gas collection bag accessory.
1. Screw the regulator into the zero air calibration cylinder.
2. Disconnect the incoming sample line from the Model GD-K11D’s gas in fitting, then
connect the calibration kit sample tubing to the gas in fitting.
NOTE: Do not connect the tubing from the gas in fitting to the regulator at this time.
3. Loosen the thumbscrew on the top of the housing, then rotate the housing cover
toward the bottom of the housing.
Setting the Zero Reading
1. Press and hold down the MODE button until 1. appears on the display screen
(approximately 3 seconds).
The SKIP light flashes.
2. Press the ∆ button twice to display 3.
3. Press the SET button.
The ZERO light flashes, and the gas reading appears on the display screen.
4. Connect the tubing from the Model GD-K11D’s gas in fitting to the regulator. The
Model GD-K11D’s pump automatically begins pulling the calibrating sample from the
zero air calibration cylinder when you connect the tubing to the regulator.
5. When the display reading stabilizes, use the ZERO potentiometer to adjust the
display reading to zero.
6. Press the MODE button.
The ZERO light turns off, and 3. appears on the display screen.
7. Disconnect the sample tubing from the regulator, then unscrew the regulator from the
zero air calibration cylinder. Leave the tubing connected to the Model GD-K11D.
8. Press the MODE button for approximately 3 seconds to exit maintenance mode and
return to the normal screen.