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SRT1000 Series

SRT1000 Series PDF

*Specifications are subject to change without prior notice.

Based on the long experienced know-how on the TOKYO KEISO's thermal flowmeters, SRT1000 series has enhanced its performance such as a reading accuracy, a reliable sealing by metal and a digital output. In measuring various gases it covers wider sizes ranging from 10 mm to even 1500 mm as standard.
Either the integral type with the sensor integrated with an indicator and converter or the separate type with an indicator and converter remotely mounted is available for the application.
Various outputs are available for your convenience such as pulse, high and low alarms, and digital output via RS485, as well as 4 to 20 mADC, 0 to 5, 0 to 10 VDC analog outputs all in standard features.
The SRT1000 covers much wider measuring range than the current thermal flowmeters.


  • · High accuracy

    Accurate flow measurement as high as ±1% R.D. between 10 to 100% F.S. and ±0.5% R.D. in less than 10% F.S. thanks to the unique calibration facilities.

  • · Metallic sealing

    The sensor has a metallic sealing mechanism, durable and corrosion resistant.

  • · Low pressure loss

    Negligible small pressure loss by a simple sensor made of stainless steel placed in the flow path.

  • · High speed response

    Not more than 1 second at 63% response.

  • · Temperature indication

    The sensor consists of a heated sensor and a temperature sensor which allows also temperature indication in the piping.

  • · Pressure compensation

    Flow rate compensation by inputting 4 to 20 mADC pressure signal for unstable process.

  • · Flow rate unit

    Normal flow rate at 0°C and 1 atm, standard flow rate, actual flow rate or mass flow rate is available.

  • · RoHS, CE marking (planning to comply with)


  • · Semiconductor equipment gas lines
  • · Medical oxygen supply lines
  • · HVAC
  • · Process and utility lines for general industry

Short Specifications

Insertion type for large pipe sizes Integral type / Separate type Inline type for medium pipe sizes Integral type / Separate type Inline type for small pipe sizes Integral type / Separate type Variable length insertion type
Model SRT1100 SRT1200 SRT1300 SRT1400
View aa a aa
Measuring object Non-corrosive gases
Process connection Flange JIS 10K/20K, ANSI 150/300, JPI 150/300
Insertion type by tube fitting Outside diameter 20 mm
SWL, VCR, Rc 3/8", 1/2", 3/4", 1"
Wafer 40 to 150 mm
Meter size 50A to 1500A 40A to 150A 10A to 25A 50A to 900A
Fluid temperature -20 to 120℃
Pressure 1 MPa Max.
Flow range Air/N₂
Max.: 35600 to 891700m³/h(nor)
Min.: 63 to 1200 m³/h(nor)
Max.: 425 to 10600 m³/h(nor) Min.: 50 to 780m³/h(nor)
Max.: 33 to 330 m³/h(nor)
Min.: 6.0 to 60 m³/h(nor)
Max.: 12840 to 321000 m³/h(nor)
Min.: 63 to 1200 m³/h(nor)
Material contacting gases SUS316L, SUS316, SCS14
Sensor element is made of SUS316L
Power supply 24±10% VDC
Protection class IP65