RKI Instruments 65-2499RK - Manual (Page 18)

14 • 65-2496RK/65-2499RK CO Detector
Setting the Zero (Fresh Air) Reading
1. Follow the instructions in the controller operator’s manual for setting the zero
reading.
2. When the instructions call for applying zero air to the detector, turn the regulator’s
on/off knob counterclockwise to open it. Gas will begin to flow.
3. Allow the gas to flow for two minutes.
4. Set the fresh air reading according to the controller operator’s manual.
5. Turn the regulator’s on/off knob clockwise to close it.
6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator and the calibration cup.
NOTE: Depending on the size of your zero air cylinder, it is possible that you will have a
different regulator for the zero air cylinder and the CO gas cylinder. If necessary
to fit the CO calibration gas cylinder, change the regulator.
Setting the Response Reading (Span)
1. Screw the regulator into the calibration gas cylinder. Make sure the regulator is off. It
is off when the on/off knob is turned all the way clockwise.
2. Follow the directions in the controller operator’s manual for setting the response
(span) reading.
3. When the instructions call for exposing the detector to gas, turn the regulator’s on/off
knob counterclockwise to open it. Gas will begin to flow.
4. Allow the gas to flow to the detector for 2 minutes.
5. Set the response reading according to the controller operator’s manual.
6. After setting the response reading, turn the regulator’s on/off knob clockwise to turn
it off.
7. Unscrew the regulator from the cylinder.
8. Unscrew the calibration cup from the CO detector. Make sure that you do not loosen
the detector housing cap when you unscrew the calibration cup.
NOTE: For convenience, leave the regulator and calibration cup connected by the
sample tubing.
Returning to Normal Operation
1. Allow about 45 seconds for the gas reading to decrease below the alarm points and
then return the controller to normal operation.
NOTE : If you do not allow the gas reading to decrease below the alarm points, then
unwanted alarms may occur.
2. Verify that the controller display reading decreases and stabilizes at 0 ppm.
3. Store the components of the calibration kit in a safe and convenient place.