26 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
1. Remove the particle filter from its tubing stub.
2. Unscrew the outside inlet fitting tube nut from the fitting body. The tubing stub should
come out with the tube nut. Be careful not to lose the O-ring that may come out with the
tubing stub. If you do lose the O-ring or if it is damaged, see “Parts List” on page 29 for
the spare part number.
3. Push the tubing stub up and out of the front ferrule being careful not to lose the ferrule set.
If you do lose the ferrule set or if it is damaged, see “Parts List” on page 29 for the spare
part numbers.
4. Push the new tubing up through the inlet fitting tube nut and replace the ferrule set and the
O-ring, if it came out, in the orientation shown in Figure 6.
5. Screw the inlet fitting tube nut back onto the fitting body. See “Connecting the Sample
Lines to the Sample-Draw Detector” on page 14 for instructions to install a new piece of
tubing into the fitting.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 6 months is adequate for most infrared combustible gas sample
draw applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 6 months.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where calibration adjustments are minimal at calibration, then a
calibration frequency of every 9 to 12 months is adequate.
If an application is very demanding, for example if the environment is not well controlled,
then more frequent calibration than every 6 months may be necessary.
Calibration
This section describes how to calibrate the sample-draw detector. It includes procedures to
prepare for calibration, set the zero reading, set the response reading, and return to normal
operation.
NOTE:
This procedure describes calibration using a demand flow regulator.
Preparing for Calibration
1. Follow the instructions in the controller’s operator’s manual for entering calibration mode.
NOTE:
If you can verify a fresh air environment, it is not necessary to use the zero air
calibration cylinder to set the zero reading.
