Overview of Overheated Steam Vortex Flow Meter
In the measurement of superheated steam, although density is also a function of temperature and pressure, it no longer follows the ideal gas state equation, and the functional relationship is different in different pressure and temperature ranges, making it difficult to express in a simple functional relationship. Therefore, this article focuses on the determination method of commonly used steam tightness.
The water vapor used in the determination of density engineering is mostly in the state of just leaving the liquid or close to the liquid, and its properties are very different from ideal gases, so it should be regarded as actual gases. The physical properties of water vapor are much more complex than ideal gases, so they cannot be described using simple mathematical formulas; So, in previous engineering calculations, most of the state parameter values involving water vapor were found from the water vapor table. Load the water vapor state parameter table into the instrument memory, which contains a large amount of data. With the development of electronic technology, computers (or microcontrollers) have been widely used in flow measurement instruments. Their storage and fast calculation capabilities provide powerful means for accurately and quickly determining the density of water vapor.Overheated steam flowmeterStrictly following the principle of reliability in design, adopting optimized design schemes with simplified structures, and achieving high universality and interchangeability of all product components; The circuit components use new components with high reliability indicators, surface mount technology, and eliminate low reliability components such as potentiometers and connectors, significantly improving the overall reliability indicators of the machine.
Specification
1 nominal diameter (mm)
Full tube type: DN10、15、20、25、32、40、50、65、80、100、125
150, 200, 250, 300, 350, 400, 450, 500, 600
2 Connection methods
Flange card type
National standard GB is used for national standard pipelines
DIN standard is used for European imported equipment matching pipelines or DIN standard pipelines
ANSI standard is used for American imported equipment matching pipelines or ANSI standard pipelines
3 nominal pressure (MPa)
Liquid 2.0 2.5 4.0 (5.0) (10.0)
Gas and Steam 2.0 2.5 4.0 (5.0)
4. Medium temperature (℃)
-40-80 ℃ for liquids and gases
-40~150 ℃ for liquids and gases
-40~300 ℃ is used for liquids, gases, saturated steam, and superheated steam
-40-350 ℃ for superheated steam
5 Accuracy (±%)
Flow sensor - pulse output: 0.5 1.0
Flow transmitter - standard current output: one

6 body, vortex generator, probe body material
1Cr18Ni9Ti is used for conventional low corrosion media (standard supply)
316 is used for conventional corrosive media
316L is used for food and other media
Hastelloy alloy is used for highly corrosive media
7 Applicable media
Gases: various gases such as air, oxygen, nitrogen, natural gas, liquefied gas, ammonia, etc
Liquids: various chemical liquids such as water, light oil, liquefied petroleum, acid, alkali, etc
Steam: saturated steam and superheated steam
8 Flow velocity range (m/s)
Liquid 0.3~7
Gas 3~60
Steam 3~70
9 output signals
Voltage pulse frequency signal: high level ≥ 5V, low level<1V, square wave, pulse duty cycle 1:1, emitter follower output (optional open collector output)
Standard current signal: a 4-20mA standard current signal proportional to the flow rate.
Display instantaneous flow rate and cumulative flow rate locally, while outputting 4-20mA standard current signal and pulse frequency signal proportional to the flow rate.
10 Power Supply
Voltage pulse type DC12V DC24V
Standard current type DC24V
Standard current output with local display DC24V
Lithium battery power supply
11 Explosion proof mark
Intrinsic safety ExiaICT-4
Explosion proof ExdIICT1-T4
12 Protection Levels
IP65 for indoor and outdoor installation
IP68 is suitable for installation in water immersed environments
13 Environmental conditions
Environmental temperature -40~+55 ℃
Relative humidity 5-90 (%)
Atmospheric pressure 86~106 (kPa)

Overheated steam flowmeterDetermination of caliber
Determination of flowmeter diameter for measuring gas flow rate
When measuring ambient temperature and pressure air, the flow range applicable to the instrument is shown in Table (1)