Yokogawa IR400 - Manual (Page 17)

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IM 11G02N01-01E
3.3 Piping
Piping should be connected to the gas inlets and outlets of the front panel of the analyzer.
•
Use a corrosion resistant tube of Teflon, stainless or polyethylene to connect the instrument to
a sampling system. Even if there is a danger of corrosion, refrain from using a tube of rubber
or soft vinyl. The instrument provides inaccurate indication due to gas absorption by piping
materials.
•
Pipe connection port is Rc1/4 female thread (or 1/4 NPT). Piping should be cut as short as
possible for a quick response. About 4 mm inner diameter is recommended.
•
Entry of dust into the instrument may result in defective operation. Use a clean piping or
coupling.
Connect the gas tube by the following method.
Sampling gas inlet: Attach the gas tube to introduce gas to be measured such as one that has
completed dehumidification process and standard gases for zero and span
calibration to this inlet.
Gas flow to be introduced should be constant within the range of 0.5
±
0.2
L/min.
Sampling gas outlet: Exhaust measured gas through the outlet. Attach the tube to exhaust mea-
sured gas outdoors or to the atmosphere.
Purge gas inlet: It is used for purging the inside of the total gas analyzer . When the ana-
lyzer must be purged, refer to Item 3.3.4 Purging of instrument inside.
Use dry gas N
2
or instrumentation air for purge gas. (flow rate of 1L/min or
more should be used and no dust or mist is contained).
Sampling gas outlet
Sampling gas inlet
Sampling gas outlet
(Purge gas inlet)
Sampling gas inlet
For measuring
unit 1
For measuring
unit 2