MSENSE
®
DGA 9 7045899/02 EN – 11.2020 Page 18
Preparing installation
A visual inspection must be carried out on the device before installation. For this purpose, unscrew the
two knurled screws and then remove the device protective cover. All the connector plugs, cables and
hoses must be connected.
4.3.1 Mechanical connection
The connection device of the MSENSE
®
DGA 9 has an external thread of the type G 1½"’ ISO DIN
228-1 or 1½" NPT ANSI B 1.20.1 (must be specified on the order).
The MSENSE® DGA 9 should be installed on a gate valve with full passage or on a ball valve on the
transformer.
These stop valves usually have a blind flange fitted. For this reason, they must be retrofitted before
installation with a suitable threaded flange, connecting adapter or threaded joint.
This results in 2 different types of installation.
4.3.1.1 Flange connection
The MSENSE® DGA 9 is screwed directly to the threaded flange, i.e. the device is turned around its
own axis in order to be fixed in place. This type of installation requires free space measuring 430 mm
in diameter around the centre of the connecting flange.
Remark: The thread depth of the threaded flange or the connecting adapter should be at least 25 mm.
4.3.1.2 Threaded joint
We recommend connecting the MSENSE® DGA 9 by a threaded joint (flat sealing) on the gate
valve/ball valve. This threaded joint, also known as a fitting, is made up of a threaded flange, a flat-
sealing insert and a union nut. In this case, the device is not turned during installation, rather the union
nut is turned to fix the device in place. A flat gasket is used for this. Additional sealing of the thread
using thread sealing tape or thread adhesive is not necessary in this case, or only rarely.
Remark: Some ball valves also have union nuts (pump ball valve).
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