RKI Instruments GD-K11D - Manual (Page 26)

22 • Calibration Model GD-K11D Operator’s Manual
Setting the Response (Span) Reading
1. Adjust the INT switch to the “1” position. The INT switch is the rotary switch located
on the amplifier circuit board (see Figure 1, Model GD-K11D Component Location).
The display reading, SPAN light, and SKIP light flash.
2. Press the MODE button, and make sure 1 appears on the left side of the display
screen.
3. Screw the regulator into the calibration cylinder.
4. Connect the tubing from the Model GD-K11D’s gas in fitting to the regulator. The
pump begins pull the sample from the calibration cylinder.
The display reading increases as the sensor begins to sample the calibrating gas.
When the display reading reaches 20% of fullscale, the reading stops flashing.
NOTE: The reading must be at least 20% of fullscale before the Model GD-K11D will
allow adjustment of the span setting.
5. When the display reading stabilizes, use the ∆ and ∇ buttons to adjust the display
reading to match the concentration of the calibration cylinder.
NOTE: If you cannot adjust the display reading to the concentration of the calibration
cylinder with the ∆ and ∇ buttons, adjust the reading to be in the middle of the
adjustment range, then adjust the reading with the span potentiometer.
6. Press the SET button to set the response (span) reading.
The SPAN light is on steady indicating that the Model GD-K11D accepted the span
setting.
7. Disconnect the sample tubing from the regulator, then disconnect the opposite end of
the sample tubing from the Model GD-K11D’s gas in fitting.
8. Reattach the sample line to the gas in fitting.
Returning to Normal Operation
1. Unscrew the regulator from the calibration cylinder.
NOTE: If the display reading is above the alarm point when you return to the normal
screen, the Model GD-K11D will initiate an alarm condition.
2. Return the INT switch to the “0” position to return to normal operation.
The SPAN and SKIP lights turn off.
3. Rotate the housing cover up to its normal position, then secure the cover to the
housing with the thumbscrew.
4. Store the components of the calibration kit in a safe and convenient place.
5. Verify that the display reading decreases and stabilizes at zero.