RKI Instruments GD-70D Series - Manual (Page 28)

2 Installation 2-3. How to wire
GD-70D - 28 -
<How to tube>
NOTE
To use the pyrolyzer unit (PLU-70), also refer to the individual operating manual.
The detector has a Rc1/4 thread inside of the sampling
inlet/outlet (GAS IN, GAS OUT), to which "polypropylene" unions
are normally attached. Because their material is varies
depending on the gas to be used, please specify the gas.
The compatible tube is a Teflon tube of φ6 (OD) - φ4 (ID). The
tube must be installed with the supplied inners and sleeves
attached to prevent a leak.
When the tube is cut, its cut point has a smaller inner diameter.
Use an abrasive material to expand the cut point to the inner
diameter. To remove cut-dust remaining inside of the tube, blow
compressed air into the tube before connecting it to the detector.
Some sample gases have highly adsorptive or corrosive features.
Select the tube material taking into account of these precautions.
The suction flow rate of the detector itself is approximately 0.5
L/min under the operating temperatures. When a gas is sucked
from a distant point, please consult us on the tube length.
WARNING
• The detector is designed to suck gases around it under the atmospheric pressure.
If excessive pressure is applied to the sampling inlet and outlet (GAS IN, GAS OUT) of the detector,
detected gases may be leaked from its inside, thus leading to dangers. Be sure that excessive
pressure is not applied to the detector while used.
• Detected gases must be exhausted from the detected gas exhausting outlet (GAS OUT) on the
bottom of the detector to which an exhaust tube is connected, to a point regarded as a safe place.
CAUTION
• The longer the tube of the GAS IN is, the longer it takes for a gas to reach the detector. Because
some gases have a highly adsorptive feature for the tube, resulting in a slow response and a lower
reading than the actual value, the length of the GAS IN tube must be minimized.
• When the humidity in the sampling point is high, condensation may be formed inside of the tube.
Make sure to avoid condensation when using a gas which is solved into water and corrodes
contacted materials, such as a strong acid gas, because it is undetectable and furthermore may
corrode internal parts. Also avoid an excessive U-shaped or V-shaped tube piping.
• Determine the inlet for the sample gas, considering the air flow of the sample gas line and the gas
generating process.
• To remove dust, do not forget to attach the supplied dust filter in the middle of the tube.
• You need to decide the length and material of the tube. Please contact our sales department for
more information.
union
inner
sleeve
tube