Thermal Mass Flow Meter - Series Scirocco
The Thermal Mass Flow meter, Series Scirocco 1000 measuring principle is based on the fact that heat is drawn from a heated body when a fuid flows past. A Thermal Dispersion Mass Flowmeter contains two Platinum RTD temperature sensors for this purpose. One sensor measures the current fluid temperature as a reference. The second sensor is heated and has a constant temperature differential relative to the first sensor. When the flow of air/gas starts heat is taken away from the warmer sensor. The amount of heat taken away is having a direct relation with the mass velocity of the fluid. This eliminates the need for temperature and pressure compensation. Thermal Dispersion Mass Flowmeter, Series Scirocco 1000 is available with insertion probe type or Complete Spool type with proper end connection. Insertion probe can be installed directly on the pipe carrying compressed air, with the help of clamps supplied along with probe.
The Thermal Mass Flow meter working principle:
The Thermal Mass Flow Meter, Series Scirocco 1000 is a precision instrument that measures gas & air mass flow and is used in various industrial processes. It’s measuring principle is based on the fact that whenever a fluid of a certain temperature is passed over any substance hotter than the fluid, the heat of the hot substance is taken away because of forced convection by the fluid, and the temperature of that substance drops. This fall in temperature is related to the mass flow of the fluid passing over the substance. If one can measure the amount of heat taken away by the flowing fluid one can calculate the mass flow rate.
A Thermal Dispersion Mass Flowmeter contains two Platinum RTD temperature sensors for this purpose. One sensor measures the current fluid temperature as a reference. The second sensor is heated and has a constant temperature differential relative to the first sensor. When the flow of air/gas starts heat is taken away from the warmer sensor. The amount of heat taken away is having a direct relation with the mass velocity of the fluid. This eliminates the need for temperature and pressure compensation.
Thermal Dispersion Mass Flowmeter Types:
The Series Scirocco 1000 is available with threaded connections, flanged connections, in flameproof housing or in clamp on version.
Where are Thermal Mass Flow Meters used?
Some of the applications of Thermal Mass Flow Meters include Compressed Air in various industries, Oxygen Generators, and other compressed gases, flow measurement of gases like CNG, PNG, LNG, LPG, Biogas, Nitrogen, etc.
Features
- Direct measurement of mass flow
- No pressure or temperature compensation required
- 40:1 turndown ratio
- possible Remote readings available on wireless
- Pulse, milliamps or RS485 output for networking
Frequently Asked Questions
What is a thermal mass flow meter ?+
Thermal mass flow meter is a flow meter that uses the concept of conductive and convective heat transfer from a heated sensor to directly measure gas mass flow.
How thermal mass flow meter works ?+
Thermal mass flow meters are used for almost all of the applications for gas flow. Thermal mass flow meters, as the name suggests, use heat to calculate flow. It uses one or more temperature sensors to introduce heat into the flow stream and measures how much heat dissipates. This approach is most effective when measuring gas mass flow. Due to heat absorption considerations, it is difficult to get a reliable signal using thermal mass flow meters in liquids.
What are the advantages of Manas thermal mass flow meter ?+
Direct measurement of mass flow. No pressure or temperature compensation required 20:1 turndown. Wireless data transfer possible. Remote readings are available on wireless. Pulse, milliamps, and RS485 output for networking.
Comparison Between Vortex Flow Meter And Thermal Mass Flow Meter
| Sr no | Parameter | Vortex Flow Meter | Thermal Mass Flow Meter |
|---|---|---|---|
| 1 | Method of measurement | Measures volumetric flow that needs to be converted to mass flow, using calculations | Directly measures mass flow. Hence more reliable |
| 2 | Pressure and Temperature Compensation | Required, as it is basically a volumetric flow meter hence signal generated is proportional to Velocity. | Not Required as the signal generated is proportional to the Mass velocity of Fluid. |
| 3 | Existing pipeline modifications for Installation | Design is based on velocity and not online size. As a result, the customer’s line size and flow meter size may differ | No Modification is essential in most the cases |
| 4 | Installation | Easy, but pipeline size matters | Very Easy |
| 5 | Recalibration | This has to be done on Flow Rig | Has to be done on Flow Rig. Relatively less expensive, as Manas offers this service at an affordable cost. |
| 6 | Suitability for low velocity | Not Suitable as vortices are not generated below 6 m/sec velocity. | Works even at velocity as low as 1 m/sec. |
| 7 | Turndown Ratio | (10: 1) | Much better (50: 1) |
| 8 | Compensation | Compensation depends on temperature. Chances of error are because of the high thermal resistance of the temperature sensor. | Compensation not required at all. Hence more reliable. |
| 9 | Error elements | There are three sensor elements – Temperature, Pressure and Flow sensor. Thus, there are three sources of error. | There is only one sensor element – Flow sensor. Hence it is more reliable |
Available Sizes
Scirocco 1000-1 and Scirocco 1000-2
| Nominal Size | Range Nm3/Hr. | Range SCFM |
|---|---|---|
| DN 15 | 69 | 40 |
| DN 20 | 122 | 72 |
| DN 25 | 190 | 112 |
| DN 32 | 312 | 184 |
| DN 40 | 487 | 287 |
| DN 50 | 761 | 448 |
| DN 65 | 1287 | 757 |
| DN 80 | 1949 | 1147 |
| DN 100 | 3046 | 1793 |
| DN 150 | 6853 | 4034 |
| DN 200 | 12184 | 7171 |
Table,
- Nm3/hr is defined at 21.11°C, 101.325 kPa
- *This is only for clean and dry compressed air.
- For other gases contact factory with more details.
Specifications
Scirocco 1000-1 and Scirocco 1000-2
| Model No | Scirocco 1000-1 & Scirocco 1000-2 |
|---|---|
| Scirocco 1000-1 | Sensor and transmitter, can be mounted directly on service pipe just by drilling holes with clamps provided |
| Scirocco1000-2 | Complete with spool with an end connection of flange /BSP(M) Threading |
| Service Fluid | Dry & Clean compressed Air / Gas. (Ex. Biogas, CNG, LPG, PNG & LNG etc.) |
| Line Size | DN15 to DN200 - DN125 not available (For others consult factory) |
| End Connection | Clamp / Flange (DN20-DN200) Threaded (BSP-F) (DN15 - DN20) |
| Accuracy | ±3 % of Actual Flow Rate between 100% to 10% of Flow rate |
| Flow Velocity Range | 5 m/s to 100 m/s max (at NTP Condition) |
| Flow Range | As per Table 1 above |
| Display | Blind/LCD 16/2 |
| . | |
|---|---|
| Output | 4-20 mA/RS 485, Pulse, Wireless Data Transfer |
| Power Supply | 24Vdc/300mA Operating voltage between 20V to 28V 230Vac with Adaptor |
| Operating Fluid Temp. | 0 - 100 C |
| Operating Fluid Pressure | 20 Bar Max (other on request) |
| Wireless | Data on Communication |
| Mobile (mobile app available) | Instantaneous flow rate and total flow display on mobile With or without External antenna - WiFi 2dBi 2.4Ghz flexible Antenna |
| Operating Ambient Temperature | 0 - 50 C |
| Temperature Drift at Ambient Temp | 0.008 % / C maximum of Full Scale in the range 0 to 60 C |
| Ingress Protection | IP 65 for Transmitter (Sensor Excluded) |
Scirocco 1000-2 (Threaded)
Scirocco 1000-1 (Clamp type)
Scirocco 1000-2 (Flanged End)
Scirocco 1000-2 Encloser Gas
Group IIB Exd IP66 (Flameproof)
Ordering
Information
Sample code explained: Scirocco - 1000-1 - DN 25 - RS4 - P O/P WR - 3
