Manual

<6.OperationandParameters>
6-14
IM 11M10B01-01E
6.4 MeasurementGasSamplingUsingAspirator
If you selected “-A”: with an aspirator as the sampling method, an aspirator is included in the OX400
package. Connect the aspirator to the sample gas outlet on the rear panel of the OX400.
Ifyouselected“T”:1/4NPTasthepipingconnector,connectanadapterbetweenthesamplegas
outlet and the aspirator.
Supply clean air or N
2
gastotheaspirator.Theexternaldiameterofthegassupplyinletoftheone-
touchconnectortypeaspiratorisФ6,andthegasoutletisФ8.Donotconfusethesupplyinletandgas
outlet when you connect the aspirator.
Connect the adapter if the piping connector is 1/4NPT.
Gas outlet
(for external diameter Φ8)
Supply gas inlet (for external diameter Φ6)
Gas outlet
Air or N
2
gas
Unit: mm
Rear panel of the OX400
Figure6.18 ExampleofConnectingAspiratorandGasPiping
Figure6.19showstherelationshipbetweenthesupplypressure,suctiongasowrate,andtotal
dischargegasowrateoftheaspirator.
The air supply pressure to the aspirator shall be in the range between 65 and 100 kPaG. Also,
maintaintheairsupplypressureatacertainvaluetopreventthepressurefromuctuating.Ifthe
pressureuctuates,thesuctionowrateuctuatesresultinginauctuation of measured data. The
allowablepressureuctuationrangeisthesetpressure±2kPaG.Furthermore,theoutletpressure
shall be equal to the atmospheric pressure. Also make sure back pressure is not applied.
Checkthesamplegasowrate,andadjustitto200±25ml/min(aoatershouldbeonthebarofthe
200ml/minbaronowmeter)usingthethrottleknobonthefrontpanelafteradjustingtheairsupply
pressure to the aspirator.
0
200
400
600
800
1000
1200
1400
60 65 70 75 80 85 90 95 100 105
6
7
8
9
10
11
12
13
Aspirator’s suction characteristics
Suction flow rate (ml/min)
Aspirator’s total discharge flow rate
Suction flow rate
Aspirator’s total discharge flow rate (l/min)
Air supply pressure range
Air supply pressure (kPaG)
Figure6.19 Aspirator’sSuctionCharacteristics