RKI Instruments M2 Manual del operador descargar pdf (Pagina 9)

30-0954RK-200 Series Sample Draw Aspirator Adapter • 6

Figure 5: Low Flow and Drain Fault Wiring, Parallel Wiring

4. Start up the detector head(s) as described in the detector head operator’s manual.

5. Connect a sample line from the area to be sampled to the sample inlet fitting at the bottom right

of the panel. The fitting accepts 1/4” OD rigid metal tubing such as copper, aluminum, or

stainless steel tubing. Be sure to use tubing appropriate for the target gas.

6. The aspirator exhaust includes the sample air. It may be routed to a different area where it can

be exhausted safely by running tubing from the aspirator exhaust fitting to the “safe” area. The

aspirator exhaust fitting is a 1/4’’ OD tubing fitting.

7. 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.

8. Connect a compressed air source up to a maximum of 140 PSI to the inlet of the regulator.

Although the regulator is rated up to 300 PSI inlet pressure, other components are rated to a

maximum of 140 PSI.

9. 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.

10. Calibrate the detector head(s) as described below.

Calibration

1. Follow the instructions in the detector head operator’s manual for setting the zero (fresh air)

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 8 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 hose barb calibration fitting on the calibration valve.

4. Push and hold the button on the calibration valve to start the flow of gas through the calibration

gas fitting. Allow the sample draw adapter to draw sample for 2 minutes and then make any

calibration adjustments necessary.

5. Release the push button on the calibration valve. Disconnect the sample bag from the

calibration fitting.

Blowback Operation

1. In the event of a clogged sample line, the blowback valve can be used to divert the compressed

air supply back through the sample line to clear obstructions.

2. Inspect the sample line first to try to remedy the situation without using the blowback valve. If

the line cannot be cleared, operate the blowback valve as described below.

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RKI Instruments M2 Manual del operador Pagina 9