IT600 Series SMC Electro Pneumatic Transducer

  • The air pressure in proportion to the current signal can be output.
    Can be used as input pressure signal in combination with the pneumatic-pneumatic positioner.
  • Wide output pressure range/0.02 to 0.6 MPa.
    The maximum pressure can be set freely through the span adjustment.
  • Independent electric unit/Explosion-proof (flameproof) construction.
    The span adjustment, zero-point adjustment, and inspection maintenance can be performed with the body cover removed even in a hazardous place where the explosion or fire may occur.
  • Easy span adjustment
    As the span adjustment mechanism uses a vector mechanism, the span adjustment can be performed smoothly.

Principle of Operation

When the input current increases, armature (1) in the torque motor will be subjected to a clockwise torque, pushing flapper lever (2) to the left. As a result, the clearance of nozzle flapper (3) will increase and the nozzle back pressure will decrease. This moves exhaust valve (10) of pilot valve (5) to the left, causing the output air pressure of OUT1 to increase.

The output pressure thus increased is passed through the path inside the pilot valve to pressure sensing bellows (6), where it is converted to the force. This force acts on vector mechanism (7) via lever (11). Because the force will balance the force generated by means of the input current at lever fulcrum (12), the output air pressure proportional to the input current will be obtained.

Gain suppression spring (8) functions to immediately feedback the movement of the exhaust valve to the flapper lever, thereby contributing to loop stability.Zero point and span adjustments are performed by varying the tension force of zero adjusting spring (9) and the angle of the vector mechanism, respectively.

principle of electro pneumatic transducer SMC IT600 Series
principle of electro pneumatic transducer SMC IT600 Series


Model IT600 IT601
Low pressure High pressure
Input current 4 to 20 mA DC
Input impedance 235 Ω±15 Ω (4 to 20 mA DC)
Supply air pressure 0.14 to 0.24 MPa 0.24 toC 0.7 MPa
Output pressure 0.02 to 0.1 MPa 0.04 to 0.2 MPa
(Max. 0.2 MPa) (Max. 0.6 MPa)
Linearity Within ±1.0% F.S.
Hysteresis Within 0.75% F.S.
Repeatability Within ±0.5% F.S.
Air consumption2) 7 L/min (ANR) 22 L/min (ANR)
(SUP = 0.14 MPa) (SUP = 0.7 MPa)
Ambient and fluid temperature –10 to 60°C
Air connection port Rc1/4 female thread
Electrical connection G1/2 female thread
Explosion-proof construction Explosion-proof (flameproof) construction d2G4 (Certificate no. T28926)
Material Aluminum die-cast body
Weight 3 kg

1) Specification values are given at normal temperature (20°C).

2) Air consumption is due to exhaust from nozzle. And (ANR) indicates JIS B0120 standard air.

Replacement Parts

Part no. Description Note
P255010-1 Pilot valve unit IT600
P255010-19 Pilot valve unit IT601

Download Datasheet: SMC IT600 Electro-Pneumatic Transducer