Valmet Valmet MCA, Инструкция по установке и эксплуатации, Страница: 13 / 66

3. Installation
3.1. General principles
The sensor model is selected according to the size of
the pipe. Flow-through models are FT50/2", FT100/4",
FT150/6", FT200/8", FT250/10", and FT300/12".
Flowthrough models can be installed on the following
pipe flanges:
– DIN PN10
– DIN PN16
– ANSI Class 150
– JIS 10K
In laboratory analysis of measurement results it is
important to use a proper sampler (e.g. NOVE). Install
it according to MCA installation instructions.
NOTE! Before installing the process coupling or sensor,
check that the process pipe is empty and unpressurized
and that installation is safe.
3.2. Choosing the installation site
The fork-type Valmet MCA-F sensor can be installed
on pipes with a diameter of 150 mm (6") or larger. In
choosing an installation position, note the following:
– It is not recommended to install Valmet MCA-F
sensor in a place where the pulp may contain strings,
etc., that may get wrapped around the sensor. If
necessary, use a separate deflector plate.
– Do not install the sensor on the pump's suction side
or in the mixing tank.
– After the sensor there should be a straight section
of pipe, length at least 2 times the pipe diameter,
before a change in pipe profile.
– Adjacent to Valmet MCA-F sensor or one meter be-
fore it there must not be objects inserted into the
pipe.
– Reserve enough space for the sensor casing. For
the Valmet MCA-F, reserve also space required for
sensor installation.
– The TCU must be installed within 10 meters of the
sensor. The sensor cable is 10m long. You also have
the option of purchasing a 10m extension cable.
In addition, you must note the following specifications:
– Process temperature under 100 °C.
– pH range 2.5...11.5.
– Conductivity according to sensor specifications.
– Recommended process pressure is 1.5 - 25 bar
(Fork sensor) / 16 bar (FT sensor) to eliminate the
effect of air bubbles.
– Sensor pressure tolerance:
• Fork sensor PN25
• FT sensor PN16
Installation checklist:
– Check that the mounting location and position are
in accordance with the installation instructions.
– Check that the flow arrow on the sensor casing is
pointing in the direction of flow.
– Protect the sensor and the TCU from direct heat
sources and sunlight.
– Valmet MCA-F: Before operating the sensor, check
that the process coupling's mounting clamp is se-
curely tightened.
– Valmet MCA-FT: Before operating the sensor, check
that the sealing between the MCA flanges and pro-
cess flanges are properly installed and that the
mounting nuts are tightened.
Sensor installation to a vertical and horizontal
pipeline is illustrated in Fig. 1 - 5.
Installation & Owner’s manual OUL00298 V2.3 EN 13 Valmet Mircowave Consistency Transmitter