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SFM800 Thermal Gas Mass Flowmeter
Features
1. Adopts patented technology platinum RTD transmitter with high stability.
2. Real mass flowmeter, need no temperature and pressure compensation. It can measure mass flow and standard flow of gas.
3. Measurement range is 500:1 and can be widened according to users’ requirement.
4. Can realize measuring small flow in big pipeline, the smallest flow rate can be 0.5Nm/S.
5. With no moving parts, vibration effect is very small and can be ignored.
6. The requirement for straight pipeline is not strict, 1-2D.
7. Has no relation with temperature and pressure of medium.
8. With digital design, complete instrument digital circuit measurement, with accuracy measurement and convenient maintenance.
9. It is not sensitive for tiny particles such as dust, and so on.
10. Can be dismounted online without cutting flow, is easy to maintenance.
Operating Principle
1. The flowmeter is made according to thermal diffusion principle has two designs: the one is based on the principle of constant difference in temperature; the other is based on constant power principle. The two are both based on the same date model: P/△T=A+B(Q)N. P-wasted power, △T-the temperature difference between two transmitters, Q-mass flow, N-index coefficient, A and B are coefficients related to the thermal property of gas.
2. Principle of constant difference in temperature: △T keeps unchanged, wasted power P increases by index function with the increase of flow rate Q.
3. Constant power principle: wasted power keeps unchanged, temperature difference decreases by index function with the decrease of flow rate Q.
Main Technical Parameters
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0.5~100Nm/s |
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Accuracy |
±1.0% reading, ±0.5% full range |
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100: 1 in general (depends on the range of calibration flow) |
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15~8000mm |
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Applied Range |
It is suitable for all kinds of pure gas or mixed gas, gas with dust, sandy, all kinds of corrosive gas. |
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-40℃~+85℃ (without display), -30℃~+70℃(with display), humidity<90%RH |
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-40℃~+100℃, -40℃~+200℃, -40℃~+350℃ |
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Transmitter Diameter |
φ2.5, φ3, φ4 |
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Plug-in Transmitter Feeler Lever Diameter |
φ19, φ25 |
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Transmitter Material |
316 stainless steel, Hastelloy, Titanium |
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Feeler Level Material (Protective Sleeve) |
316G stainless steel (standard), Hastelloy |
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Analog Flow Output |
Flow: 4-20mADC output, temperature: 4-20mADC, maximum load: 500Ω |
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Power Supply |
Complete Instrument DC24V/AC220V, separated transmitter AC220V |
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Operating Principle |
Plug-in type≤2.5mpa, pipeline type≤4.0mpa |
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Installation Technical Mode |
Plug-in type (clamping hoop), clamping hoop + ball valve, flange connection), pipeline type (flange, thread connection). |
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Explosion-proof Level |
Intrinsic safety, flame-proof type |
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Protective Level |
IP65 |
Dimension Figure
.jpg)
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Inside Nominal Diameter |
15 |
25 |
40 |
50 |
80 |
100 |
150 |
200 |
250 |
300 |
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L (mm) |
300 |
300 |
350 |
350 |
450 |
450 |
500 |
600 |
600 |
650 |
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H (mm) |
300 |
300 |
300 |
300 |
350 |
380 |
400 |
450 |
500 |
550 |
Ordering Models
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Basic Model |
Connection Mode |
Pipeline Diameter |
Structure Style |
Power Supply Mode |
Medium Temperature |
Working Temperature |
Accuracy |
Illustration |
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SFM800 |
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Thermal gas mass flowmeter |
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F |
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Pipeline type |
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J |
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Plug-in type |
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15~8000 |
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15~8000mm |
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L |
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Integral type |
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R |
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Separated type |
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316 stainless steel rotor |
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24D |
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24VDC |
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220 |
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220VAC |
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A |
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-20℃~+100℃ |
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B |
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-20℃~+200℃ |
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C |
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-20℃~+350℃ |
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F |
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pulse |
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I |
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4-20mA |
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R |
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RS485, RS232, Mudbus |
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H |
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Hart Protocol |
