Valmet Valmet MCA, Инструкция по установке и эксплуатации, Страница: 9 / 66

2. Structure
Valmet MCA comprises the sensor unit and a user in-
terface called Transmitter Central Unit. There are two
sensor models: MCA-F Fork Sensor and MCA-FT Flow-
Through Sensor, which come in six different sizes
ranging from FT-50 to FT-300. The appropriate model
is selected according to the diamater of the process
pipe.
2.1. MCA-F
In the fork-type MCA-F sensor, the microwave antennas
are mounted on the sensor body, which is installed via
a coupling into the process pipe. On the end of the
sensor there is a probe antenna and on the base there
is a flushmounted antenna. In addition, on the end of
the sensor body there is a Pt-100 thermoelement. The
antenna cables and the Pt-100 sensor cables run
through the inside of the sensor to the sensor electron-
ics.Figure 3 shows the sensor's construction drawing.
The material of the wetted metal parts is AISI316L,
with options of titanium or hastelloy. The antenna ma-
terial is polished ceramic.
1
2
3
4
Fig. 1. Valmet MCA-F: 1. Pt-100 Thermoelement, 2.
Microwave Antennas, 3. Sensor Electronics, 4. Sensor
Cable Connector.
2.2. MCA-FT
The body of the Flow-Through sensor is a pipe, which,
when installed, replaces an identical length of process
pipe. Flush-mounted antennas are installed on opposite
sides of the sensor body, so measurement takes place
through the pipe. The sensor electronics casings is in-
stalled on the sensor body by means of a connecting
pipe. The Pt-100 sensor, which measures process
temperature, is installed inside the connecting pipe.
The antenna cables, which are protected within casing,
run to the base plate of the electronics casing on the
outside of the connecting pipe. Figure 4 shows the
sensor's construction drawing.
The material of the wetted sensor and antenna
bodies is AISI 316/316L. The antenna material is pol-
ished ceramic.
1
2
3
4
5
Fig. 2. Valmet MCA-FT: 1. Sensor Electronics, 2.
Sensor Cable Connector, 3. Antenna Cable, 4. Pt-100
Thermoelement, 5. Microwave Antennas.
Installation & Owner’s manual OUL00298 V2.3 EN 9 Valmet Mircowave Consistency Transmitter