RKI Instruments 65-2484RK-06 - Manual (Page 27)

65-2484RK-06 Multi Point Detector • 23
Calibration, SO
2
Detector
This section describes how to calibrate the toxic detector. It includes procedures to prepare
for calibration, set the fresh air reading, set the response reading, and return to normal
operation. It describes calibration using a calibration kit that includes an 81-1138RK
calibration cup, calibration gas, sample tubing, and a fixed flow regulator with an on/off
knob.
WARNING: Not using the recommended 81-1138RK calibration cup, 0.5 LPM sample
flowrate, and specified flow direction will result in an inaccurate
calibration of the SO
2
channel. Make sure to connect the sample tubing to
the calibration cup port that results in the specified flow direction for the
81-1138RK calibration cup.
Preparing for Calibration
1. Unscrew the splashguard from the detector housing cap. Make sure the cap remains
securely screwed onto the housing body.
2. Push the calibration cup onto the plug-in sensor that sticks through the housing cap.
The calibration cup seals to the sensor with an O-ring.
3. Screw the regulator into the zero air calibration cylinder.
4. Use the sample tubing to connect the regulator to the calibration cup. Make sure to
connect the tubing to the inlet side of the calibration cup if using the 81-1138RK
calibration cup which is marked on the outside bottom to show the required flow
direction through the cup.
NOTE If you can verify that the toxic detector is in a fresh air environment, you do not
need to apply zero air to the detector before adjusting the fresh air reading.
5. Put the controller into its calibration program. See the controller operator’s manual
for instructions to enter the calibration program.
Setting the Zero 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 toxic gas cylinder. If necessary to
fit the calibration toxic gas cylinder, change the regulator.