| Plug-in vortex flowmeter|
The vortex probe inserted into the pipe a specific location, by measuring the local flow at that location, based on the relationship between velocity distribution pipe section to calculate the average velocity value in the pipeline. It is by the converter, the insertion rod assembly, the ball valve (with on demand), the installation short tube (ф100), vortex measuring class composition.
Plug-in vortex flowmeter installation steps:
1. On the need to install a meter above the pipe (horizontal pipeline have this requirement), cut a hole slightly smaller than ф100 and remove the burr;
2. The upper end of the supporting short tube with a flange on the hole, keeping the short vertical tube and pipe, welding firm;
3. Put pads, insert the flowmeter, flange connection, if at this time there are ball valves, ball valves should be first on the short tube connected, then open the valve, insert the flowmeter;
4. Ensure before and after the flowmeter has more than 15D straight pipe section 5D of (D is the pipe diameter).
Second, the principle
According to the International Organization for Standardization IS07145 (measuring fluid flow in closed conduits of circular cross-section - the speed measurement point in cross-section), using embedded piezoelectric crystal vortex velocity probe is inserted into the large diameter industrial pipes, the Karman vortex frequency conversion as the flow rate proportional to the current or voltage pulse signal or 4 ~ 20mADC current signal.
Third, the instrument characteristics
a. can achieve continuous stream removable sensor, enabling the amplifier and sensor separation (separation distance 15m).
b. using interference cancellation circuit and vibration sensor head, so that the instrument has a certain resistance to environmental vibration performance.
. c small pressure loss, wide range, a range of up to 1:25.
d. no moving parts, long-term stability, simple structure, easy to install and maintain.
e. can be measured medium temperature up to + 250 ℃.