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Fork density meter Principle:
Fork sensors ---------- one pair  fork ceramic sheets
A piezoelectric ceramic is responsible for generating vibrations
A piezoelectric ceramic is responsible for collecting vibration
The fork is always vibrate in the resonant frequency of vibration
Fork in different densities ,the resonance frequencies was different,.according to the relationship between the different vibration and density to calculate the density
The resonance frequency of the tuning fork is between 1600-2400
The higher the frequency the smaller density.

Fork density meter parameter:
1 Density range :0-3 g / CM3 (3 /2.5/ 2 /1.5/ 1)
2 Output:4-20 mA  4-wire ( 2-wire system can not be used)

3 Accuracy:0.001 g / cc, with a resolution of 0.0001 g / cc
4 Insertion depth :(flange distance to the end of the fork, minimum 125 mm, up to 2 meters)

5 Wetted material: stainless steel, Hastelloy C22, 400 manganese alloys, titanium, etc.
6 Fork Coating: standard, PTFE or electrolytic polishing
7 Power supply: 20 - 28 VDC, 35 - 45 mA

8 Operating temperature range: -50 ℃ ~ + 200 ℃
9 Maximum working pressure: 20Mpa
10 Fluid viscosity range: 0 - 20000 cP
11Temperature coefficient: 0.1 kg / m3 / ℃ (corrected)

12 Process connection: 1.5 "NPT threaded connection; DIN 50 PN40 and PN100 flange connection;
13 Protection: IP65
14  Display: Up density value, the density value can be switched to kg / cubic meter or g / cc by unit keys. Down display a temperature value (measured medium temperature ) temperature is original PT1000
15 Accessory:   temperature of 4-20 mA output signal
16 The internal circuit board with automatic filtering function, other vibrations like pipe vibrations can eliminate away from the side of circuit and software,whichensure accuracy.

Fork density meter Advantage:
1.Using high precision measuring density, is mainly used in power plant. 
Can not be affected by temperature, pressure and flow rate , the factor affecting measuring error
Is less.