COMAC CAL CALOR 40 - Page 11

CALOR 40 Manual Page 11 (total 27) COMAC CAL s.r.o.
Pipeline at high temperatures
When the temperature of the measured liquid is above 100°C, it is necessary to compensate
the forces caused by linear expansion of the pipeline due to its warming. It is necessary to use
a flexible seal for short pipelines. Flexible pipeline components are to be used for long
pipelines (such as bends).
PTFE lining
Install at the lowest position of the pipeline to avoid negative pressure to develop. Never
separate and foul up the rim of PTFE lining extended over the faces of the flow sensor.
Remove the caps from the inlet and outlet ends just before insertion of the sensor between the
pipeline flanges and replace them with metal plates (0.3 ÷ 0.6 mm in thickness). Remove the
metal plates after the sensor has been inserted.
Resistance temperature detectors
The resistance temperature detectors Pt 500 are installed in piping or angular tubes that are
provided with inclined or straight welded-on pieces with G 1/2“ thread according to the
temperature sensor manufacturer. The sensors are usually placed in protective wells and their
lengths are selected according to nominal inside diameter of the pipes. The wells are
provided with G 1/2“ thread.
Temperature sensors are assembled at the angle of 45 in the direction opposite to the flow of
the medium. The temperature sensor is sealed in the protective well against unauthorized
removal.
Well length selection example:
For piping with outside diameter: - up to 40 mm - well length approx. 50 mm
- 50 to 125 mm - well length approx. 80 mm
- 150 to 300 mm - well length approx. 150 mm
Installation check
After the flow sensor has been installed in the pipe, it is necessary to check:
- According to the label, if there is a corresponding meter at the given measuring place
(pressure, temperature, dimensions, etc.).
- If the arrow direction on the device corresponds to the fluid flow direction in the pipe.
- The correct position of the measuring electrodes (horizontal).
- The correct position of the electrode for detecting empty pipe (up).
- If all the terminals (bolts) are tightened properly.
- If grounding rings are used, if they have been installed correctly and if they are
connected to the sensor.
- Correct flow sensor grounding.
- Correct installation of the restful sections of the pipe.
- If the sensor is protected against vibrations and mechanic tension.
- If the label (serial number) on the sensor corresponds to the label of the electronics.