SI-3503 Gas Mass Flow Meter

SI-3503 Gas Mass Flow Meter,
is the flange type pipe thermal mass flow meter.
Gas Mass Flow Meter is an ideal choice for the measurement of flow rates of a wide variety of gases.
SI-3503 In-line type thermal mass flow meter,
provides direct mass or standard volumetric flow measurement,
for gas or air.
Temp. range-10~350℃
PressureMedium pressure≤10MPa
Flow rate0.5-100m/s
ProtectionIP67 (sensor part)
  • In-line flow sensor, with flange or thread process connection
  • Large turndown ratio-100:1, so it can also detect low velocity flow
  • Digital gas flow transmitter with instant flow and total flow, can even display gas temperature upon request
  • Mass flow meter without any temp & press compensation
  • Low price cost, directly buy from China thermal mass flow meter manufacturer
  • No moving parts for long time usage






All gases (except acetylene)

Pipe diameter

DN10-80 (Flange type)

DN100-6000 (Insert type)

Flow rate




Operating temp.


Default type: -10~+200℃

High temp. type: -10~350℃



Operating pressure

Medium pressure≤10MPa

Medium pressure≤2.5MPa

Power supply

Compact type

DC24V or AC220V≤18W

Remote type


Response time




Optical isolation, max. load 500Ω


Optical isolation


Pipe material

Carbon steel, stainless steel, plastic, etc.


Compact type: 4 lines LCD display

Display content

Mass flow, standard volume flow, accumulated flow, time, accumulated time, medium temp., standard flow, etc.

Ingress protection

IP67 (sensor part)

Sensor material

Stainless steel

Stainless / carbon steel

In addition to regular products, we support customization

SI-3503Thermal mass flow meter
Sensor typeC           Retrench pattern insert type
D           Online pluggable type
E           Flange pipe type
F           Thread pipe type
G           Clamp on type
Pipe diameterC         Round pipe: DN15~DN6000
S         Square pipe: 25*25mm~2000*2000mm
Housing materialA           SUS304
B           SUS316
C           Other material
PressureS            1.6MPa
M           2.5MPa
T            4.0MPa
Temp.I                10~200℃
II              10~400℃
Output1                 4-20mA
2                 RS485
3                 PULSE
4                 Relay contact
5                 HART
PowerDC        24VDC
AC        220VAC
DisplayJ          Integrated display
S         Split display

Gas in industrial pipelines Air, used as gas combustion flow meter, thermal mass flow meter high temperature air flow measurement.

Flue gas out of chimneys.

Waterfall gas during water treatment Gas and compressed air

Thermal mass flow meter for compressed air

Flow measurement and used as natural gas flow meter, coal gas flow meter, liquefied gas flow meter, thermal mass flow meter for flare gas and hydrogen gas etc.

Flow measurement of trapped gas in steelworks

Thank you for packing in the wooden box, the goods are well preserved.

Techincal Support

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