RKI Instruments 65-2484RK User Manual
Page 38
34 • 65-2484RK Multi Point Detector
WARNING: Not using the recommended 81-1138RK-XX calibration cup, recommended
sample flowrate, and specified flow direction will result in an inaccurate
calibration of the ESM-01 channel. Make sure to connect the sample tubing
to the calibration cup port that results in the specified flow direction for
the 81-1138RK-XX 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.
NOTE:
RKI controllers have a minimum hold feature for zero adjustment and a peak
hold feature for span adjustment. Because of this, the instructions call for turning
off the gas to a detector before making adjustments.
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.
Turn the regulator’s on/off knob clockwise to close it.
5.
Set the fresh air reading according to the controller operator’s manual.
6.
Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator and the calibration cup.
Ammonia (NH
3
)
81-1138RK-NH3
81-1051RK-25, 0.25 LPM
No
Phosphine (PH
3
)
81-1138RK
81-1051RK, 0.5 LPM
Yes
Sulphur Dioxide (SO
2
)
81-1138RK
81-1051RK, 0.5 LPM
Yes
Detector Type
Required
Calibration Cup
Required Regulator/
Flowrate for Calibration
Gas
Flow Direction
Specified on
Calibration Cup