RKI Instruments 30-0951RK-IR - Manual (Page 6)

6 • 30-0951RK-IR Sample Draw Aspirator Adapter
1. Install and startup the detector head as described in the detector head operator’s
manual. Make sure there is sufficient room between the detector and the mounting
surface to install the sample draw adapter.
2. The sample draw adapter is normally shipped installed to the detector. If not, screw
the detector adapter onto the detector tightening firmly by hand and then attach the
chamber (with the regulator, aspirator and flowmeter attached) onto the detector
adapter with the three captive thumbscrews.
CAUTION: Make sure the detector adapter is installed tightly and after installation is complete
verify that the detector adapter is still tightened firmly onto the detector to avoid
possible leaks.
3. Connect a sample line from the area to be sampled to the inlet fitting on the
flowmeter. The fitting accepts 1/4” OD rigid metal tubing such as copper, aluminum
or stainless steel tubing.
4. The aspirator exhaust includes the sample air. It may be routed to a different area
where it can be exhausted safely by installing a tube fitting in the exhaust port of the
aspirator and running tubing to the “safe” area from this port. The port has 1/8 NPT
female threads.
5. Turn the regulator adjustment knob completely counterclockwise and then turn it one
turn clockwise so that the flow will start out at a low level when the compressed air is
connected and turned on.
6. Connect a compressed air source up to a maximum of 300 psi to the inlet of the
regulator. The regulator is only rated up to 300 PSI inlet pressure. Adjust the regulator
adjustment knob so that the flowmeter indicates 3 SCFH. The regulator exhaust
pressure indicated by the regulator gauge will vary for a particular flow depending
on the length of the sample line and other restrictions such as filters. Typically the
pressure will be between 5 and 10 psi for short sample runs. It will be higher for
longer sample runs and if filters are used.
7. Calibrate the detector head as described below.
NOTE: Calibrate the detector head with the sample draw adapter installed to insure an
accurate reading.
Calibration
1. Follow the instructions in the detector head operator’s manual for setting the zero
reading and making span adjustments.
2. When introducing gas to the detector, fill a gas sample bag with a regulator or
dispensing valve. See “Parts List” on page 7 for available parts.
NOTE: A gas bag is recommended for calibration instead of a demand flow regulator because a
demand flow regulator introduces enough flow restriction to significantly reduce the
flow. If a demand flow regulator is used, the flow will have to be adjusted up to 3 SCFH
while the regulator is connected during calibration and down to 3 SCFH after calibration.
3. Connect the sample bag tubing to the inlet of the flowmeter.
4. Allow the sample draw adapter to draw sample for 2 minutes and then make any