35-3001-06H-DIL Hydrogen/Oxygen Sample-Draw Detector • 19
CAUTION:
Do not pull the tubing stub downward to remove it.
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 23 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 23 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 5.
5. Screw the inlet fitting tube nut back onto the fitting body. See “Connecting the Sample Lines to
the Sample-Draw Detector” on page 9 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 3 months is adequate for most sample draw detector applications. Unless
experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a
calibration frequency of every 3 months.
If an application is not very demanding, for example detection in a clean, temperature controlled
environment, and calibration adjustments are minimal at calibration, then a calibration frequency of
every 6 months is adequate.
If an application is very demanding, for example if the environment is not well controlled, then
more frequent calibration than every 3 months may be necessary.
Calibration, LEL Sensor
This section describes how to calibrate the hydrogen sensor of 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:
When calibrating the LEL sensor, if an inlet sample line is installed, calibration gas must
be applied at the end of the inlet line, not at the inlet fitting. The calibration will not be
accurate if calibration gas is applied at the inlet fitting.
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.
2. Screw the fixed flow regulator into a zero air calibration cylinder.
