Xylem sensus DomoJet R, User Manual

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instead of the meter.
2. If there is no water in the tube before installing the meter, open the valve upstream from the meter. This is
necessary because the valve can cause air suction at the end of installation which could damage the meter.
3. Before using the meter, first fully remove air from the pipe and the meter itself. The interception/ adjustment valves
must be fully open when doing this. Open the valve at the start first and then open the valve at the end.
4. When replacing the meter, it is recommended to replace the gasket on the fitting. Recommended gasket hardness:
minimum 80 Shore A. Tighten the nut with a torque wrench and use a counter wrench to hold the meter in position.
Maximum tightening torque: 40 Nm. Before positioning the seal, make sure that:
The seal is not damaged during installation.
The level of the seal is level with the tubing.
The seal does not protrude from the tube.
The surfaces of the flange are clean and undamaged.
5. Install the meter in a position that is protected from freezing (insulate it if necessary with insulation material) and in
the lower part of the system to prevent air accumulation.
6. Use the following guidelines to ensure correct installation:
Install the meter in a position protected from blows and tampering, where readings are easy to make.
Install the meter so that the direction of the arrow on the meter coincides with the flow direction.
Install proper interception valves upstream and downstream from the meter to permit maintenance operations and
inspections on the meter, as well as to check the system.
The installation of a non-return valve inside or outside the meter is also recommended (see dedicated data sheet).
7. Check the seal hold to prevent leakage.
Follow these guidelines during installation:
Installation position
Observe the indications on the dial (letters H and V):
H: the meter must be installed with the dial in a horizontal position.
V: the meter must be installed with the dial in a vertical position.
H and V: the meter may be installed with the dial in either a horizontal or vertical position.
Avoid vertical installations with downward flow, or with the dial facing downwards.
Allowable water pressure (ISO 4064-1)
The maximum allowable pressure (MAP) is 16 bar, and is displayed on the meter dial. If not indicated on the dial, it must
be 10 bar. These values must never be exceeded. The maximum allowable pressure (MAP) downstream of the meter
must be greater than or equal to 30 kPa (0,3 bar).
Commissioning
Before putting the meter into operation, completely vent the air from both the pipe and the meter itself (rotate it if
necessary). The interception/adjustment valves must be fully open when doing this. Open the valve at the start first and
then the valve at the end.
Seals
A seal is applied to the meter: it cannot be opened without breaking it. Any intervention must therefore be carried out