GESTRA UNA 46, Original Installation Instructions

Page: 15 / 52

15
Mounting the measuring electrode
If using models with electrode cover, you can fit one
or two measurement electrodes of the following
types to the device:

NRG16–19 or NRG16–27 on the top of the body
(23) for measuring the banking-up of
condensate

NRG16–19 or NRG16–27 on the side of the
body (25) for measuring the loss of condensate
Fitting the NRG16–27 on the top of the
body on models with DN15–DN25 requires
an adapter (22) with sealing ring. The
adapter with sealing ring can be
purchased from the manufacturer using
the stock code 556841.
For models with standard cover, you can attach a
measurement electrode to the side.
The following tools are required for assembly:

Size 22, 24, 27 and 32 open-ended spanner,
DIN 3113, form B

Torque wrench 60-120 Nm to DIN ISO 6789
Attention!
Incorrect installation may cause damage to
the measurement electrode.

Make sure that the device is not
insulated after installing a
measurement electrode.

Read and follow the instructions in the
measurement electrode operating
instructions.
Fit the measurement electrodes as follows:

Lubricate the thread and head of the
measurement electrode with temperature-
resistant lubricant.
The lubricant must have the same properties as
OKS
®
217.
If you wish to fit a NRG16-27 measurement
electrode with adapter (22) in the top connection,
you must proceed as follows:

Place the sealing ring of the adapter onto the
adapter.

Screw the adapter (22) with sealing ring into the
top connection.

Tighten the adapter to a torque of 75 Nm.
The remaining steps are identical for both fitting
types and connections:

Screw the measurement electrode into the
connections on the body illustrated below using
a suitable open-ended spanner.

Tighten the measurement electrode to a torque
of 75 Nm.

Connect the device to the pipe as described in
the previous section.

Connect a balance pipe to connection G¼ ”
(24).
Before mounting measuring electrodes
please note:
If a measuring electrode type NRG 16–27
is mounted on top of the body, only a
screwed union for a pipe with cross
section 8 mm will fit into the bore G¼”. If a
screwed union for a pipe with cross
section 10 mm were used, the hexagon
connection would press onto the
measuring electrode.