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.

Specification¹⁾

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 (Max. 0.2 MPa)	0.04 to 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) (SUP = 0.14 MPa)	22 L/min (ANR) (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