SILVER AUTOMATION INSTRUMENTS LTD.

Biogas Flow measurement By thermal mass flow meters

Thermal mass flow meter can work for a lots of gas, such as clean gas or mix gas, below we take two examples for thermal mass flow meters used as biogas flow meters.

Application 1:

"SILVER INSTRUMENT" THERMALL MASS FLOWMETER                 

We need transmitter is Compact Type           

Line Size : 6"(150mm)              

Power Supply : 24 VDC/400mA                

Display : LED : 4 Digit instantaneous flow , eight Digits totalized flow          

Turn down ratio : Normal 100 : 1             

Explosion Proof : Exd II CT4              

Output Signal : 4-20mA 2 Wire                 

Correction: 16 non-linearity correction           

Calibrated for 0-833 Nm3/Hr in 150 mm HDPE pipe @ 40° C and 0-200 mbar               

Gas flow meter Sensor Diameter: Ø3mm                

Flow Sensor Material: 316 Stainless steel

Probe Stem Diameter : Ø16             

Probe Stem Material : SS316T                  

Process connection for the thermal mass flow meter : Flange Connection : DN150 PN10 RF

Protection level : IP65              

Accuracy request : +/- 0.5 % of Reading         

Service Condition            

Fluid : Bio gas ( CH4 70% + CO2 30%)             

Flow Range: 0-833 Nm3/hour         

Operating Pressure: 0-200 mbar             

Operating Temperature: 40 C         

Max. Pressure rating: 10 bar          

Max. Temperature rating: 60 C

Can you please choose a biogas flow meter for us ?

Answer:

Hi, Thanks for your inquiry , we choose thermal mass flow meters, and from our catalog gas flow range table , we check that DN150 thermal mass flow emter can work for your flow range.

Draft Model is as below :

SRK-100-DN150-I-PL-F-16-6-A1-T0-P1-D-1-A0-E     

SRK-100 seires thermal mass flow meter

150-Flow meter size : 150mm

I-Transmitter compact type.

PLF-Process connection: Flange connection

16-Probe diameter 16mm

6-Probe material 316 stainless steel

A1-Explosion proof : with

T0-Operation temperature: -20~60  

P1-Operation pressure:0-1Mpa

D-Power supply:24V DC

1-Output:4-20mA

A0-No alarm request

E- With digital display.

 

 

Application 2:

 

Hi, we need a suitable flow meter for below application:

Application =  biogas.65-70% methane, 30-35% CO2. We are assuming average gas flow of 5m³per day. Max flow would be 15m³/day. Approx 10 litres/min.

Currently using an inch line. Temp of gas is ambient. 20 degrees Celsius. Pressure can be between 3kpa gauge and zero gauge. And the biogas is not dry , it is wet and contained around 8% water.  I need temperature and pressure compensation as well please .

I was thinking of your Cone flow meter.  That can handle the wet biogas.

Answer:

Hi, after checking your case, we think the pressure is too low. Your pressure is really low , and V-cone flow meter has large pressure loss. for the little pressure , the biogas can not pass the  flow meter.also one inch size v-cone flow meter is really too small, and can not calibrate in the factory, 

But we recommend our thermal mass flow meters. The best part for this gas flow meter is that it can work for your low pressure operation , and it does not need any temperature and pressure compensation, it can display normal flow (Nm3/h). if the water content is not more than 15%,our thermal mass flow meter can also work. See below proper type thermal mass flow meter..

SRK-100-25-I-PL-F-16-6-A1-T0-P1-D-1-A0-E    

SRK-100 seires thermal mass flow meter

25-Gas Flow meter size : one inch

I-Transmitter compact type.

PLF-Process connection: Flange connection

16-Probe diameter 16mm

6-Probe material 316 stainless steel

A1-Explosion proof : with

T0-Operation temperature: -20~60  

P1-Operation pressure:0-1Mpa

D-Power supply:24V DC

1-Output:4-20mA

A0-No alarm request

E- With digital display.

 

If you want to know the price cost for above type thermal mass flow meters, please do not hesitate to contact us

 

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