Hach GA2 00 Series, Руководство пользователя

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3.3 Accessories installation
3.3.1 External pressure sensor
The system can be fitted with an external pressure sensor. This enables a measurement of fraction
of gas under variable pressure conditions during gas phase measurement.
Note: Do NOT exceed the pressure range of the sensor. This would permanently deform the sensor membrane,
thus delivering incorrect pressure values in the future.
The external sensor connects to the ORBISPHERE measuring equipment with a 1 meter cable and a
4 pin connector (an optional extension cable can be used, but total length should not exceed 50 m.).
The external pressure sensor can be installed in the 32002.xxx multi parameter flow chamber. It is
held in place by a blue threaded collar. Tightness is assured by the O-ring on the sensor seat.
Two models are available, depending on application. Refer to
Figure 5 .
• 28117—Pressure sensor 0 to 5 bar absolute
• 28117C—Pressure sensor 0 to 1 bar absolute
Figure 5 External pressure sensor
3.3.2 Weld-on stainless steel socket
The 29501 weld-on sensor socket can be used to install a sensor into a stainless steel pipe (min.Ø
50 mm or 2”). When welding the socket to the pipe, check that setback between the pipe’s inner
diameter and the sensor tip does not exceed 4 mm. Refer to
Figure 6 .
Note: Be sure to remove the two O-rings from the socket before welding and leave the sensor’s stainless steel cap
screwed on during welding to prevent thread distortion.
Recommendation: To facilitate sensor removal and installation, we suggest installing the socket in a
location where the liquid can be drained quickly and easily. By creating a one meter long piece of
pipe (shown below) with shut off valves at both ends, just a small volume of liquid needs to be
drained to enable sensor removal. Also, a precise sensor and socket installation can be performed in
the workshop, and this assembly can be placed in the production line with minimal down time. Refer
to
Figure 7 .
English 15