RKI Instruments 61-0198RK - Manual (Page 17)

61-1007RK/61-0198RK Carbon Dioxide Detector • 13
1. Follow the directions in the controller’s operator’s manual for setting the zero reading
(sometimes called the fresh air reading).
2. When the directions call for exposing the detector to zeroing gas, screw the regulator
into the cylinder, turn the on/off knob counterclockwise to open the regulator, and
allow the gas to flow to the detector for 1 minute.
3. Turn the regulator’s on/off knob clockwise to close the regulator.
4. Set the zero reading according to the controller’s operator’s manual.
5. Unscrew the 100% nitrogen cylinder from the regulator.
Setting the Response Reading
1. Follow the directions in the controller’s operator’s manual for setting the response
reading (span).
2. When the directions call for exposing the detector to calibration gas, screw the CO
2
cylinder onto the regulator, turn the on/off knob counterclockwise to open the
regulator, and allow the gas to flow to the detector for 1 minute.
3. Turn the regulator’s on/off knob clockwise to close the regulator.
4. Set the response reading according to the controller’s operator’s manual.
5. Unscrew the CO
2
cylinder from the regulator.
Returning to Normal Operation
1. Remove the sample tubing from the regulator.
2. Remove the calibration cup from the detector. Leave the sample tubing connected to
the calibration cup for convenience.
3. Allow the reading at the controller to decrease below the alarm points before
returning the controller to normal operation or enabling external alarms.
NOTE: If you do not allow the gas reading to decrease below the alarm points, then
unwanted alarms may occur.
4. Verify that the controller display reading decreases and stabilizes at a typical
background CO
2
level. The 0-5,000 ppm and 0-5 %volume detectors will display a
reading in a fresh air environment because they have low ranges. The 0-50 %volume
and 0-100 %volume detectors will not display a reading in fresh air because their
ranges are too large.
5. Store the components of the calibration kit in a safe and convenient place.