IT601-000-0: SMC IT600 Series Current-to-Pressure Converter (4-20mA Input, 0.24-0.7MPa Supply, Rc1/4 Ports)

I. Model Designation and Basic Parameters
Model Structure: IT601-000-0

Code	Meaning	Detailed Description
IT601	Series Code	SMC IT600 Series Current-to-Pressure Converter
000	Output Pressure Classification	0.02–0.2MPa Output
0	Input Current Classification	4–20mADC Input

Main Technical Specifications:

Characteristic	Specification	Practical Significance
Input Signal	4–20mADC	Standard process control current signal
Output Pressure Range	0.02–0.2MPa	Adjustable output range
Supply Pressure Range	0.24–0.7MPa	Required supply pressure range
Port Size	Rc1/4	Air circuit port specification
Linearity (Accuracy)	±1% F.S.	Linear accuracy
Hysteresis	≤0.5% F.S.	Repeatability performance
Sensitivity	0.2kPa (for 100kPa specification)	Minimum detectable pressure change
Ambient Temperature	5–50°C	Operating environment temperature range
Ambient Relative Humidity	≤85% RH	Operating environment humidity range
Air Consumption	Approx. 300 L/h	Static air consumption
Transmission Time	≤5s (for φ4×60m piping)	Response time
Weight	Approx. 2 kg	Product weight
Explosion-proof Construction	Flameproof/Explosion-proof	Suitable for hazardous locations
Communication Interface (Optional)	CC-Link, DeviceNet™, PROFIBUS DP, RS-232C	Optional communication features

II. Structural Features and Operating Principle
Structural Components:

• Electrical Unit: Independent electronic components section with flameproof construction for field serviceability.
• Torque Motor: Converts current signal into mechanical displacement.
• Nozzle-Flapper Assembly: Converts mechanical displacement into a backpressure signal.
• Pilot Valve: High-flow pilot valve providing large output flow capacity.
• Pressure Sensing Bellows: Feeds back output pressure to the balance mechanism.
• Vector Mechanism: Enables smooth span adjustment.
• Zero/Span Adjustment: Externally accessible for easy field calibration.
• Thermistor: Provides internal temperature compensation for improved stability.

Operating Principle:
The IT601-000-0 employs a torque motor, nozzle-flapper, and pilot valve structure. When the input current (4–20mADC) increases, the armature in the torque motor experiences a clockwise torque, pushing the flapper lever to the left, increasing the nozzle-flapper gap and thus reducing nozzle backpressure. This backpressure change actuates the pilot valve, causing the output pressure to increase. The increased output pressure is fed back via the pressure sensing bellows to the vector mechanism, balancing against the force generated by the input current. This results in a stable output pressure proportional to the input current. The vector mechanism allows for smooth span adjustment, while the thermistor provides temperature compensation to ensure accuracy stability across varying ambient temperatures.

III. Core Advantages

1. High-Precision Control
   • Linearity ±1% F.S., Hysteresis ≤0.5% F.S.
   • Sensitivity of 0.2kPa enables detection of minute pressure changes.
   • Vector mechanism ensures smooth span adjustment and stable control.
2. Fast Response
   • Large-capacity pilot valve allows for high output flow.
   • Excellent response when directly operating actuators.
   • Transmission time ≤5s (φ4×60m piping) meets fast control requirements.
3. Explosion-Proof Safety
   • Independent electrical unit with flameproof/explosion-proof construction.
   • Suitable for use in potentially explosive or hazardous locations.
   • The cover can be removed for span/zero adjustment, inspection, and maintenance.
4. Excellent Temperature Stability
   • Internal circuit includes thermistor for automatic temperature compensation.
   • Ambient temperature error of 0.4%/10°C minimizes temperature influence.
   • Suitable for industrial sites with significant temperature variations.
5. Easy Installation and Maintenance
   • External span and zero adjustments facilitate easy calibration and servicing.
   • Can be mounted in any orientation, offering flexible installation.
   • Compact, lightweight design with a small footprint.
6. Wide Applicability
   • Broad supply pressure range (0.24–0.7MPa) suits various applications.
   • Low air consumption (~300 L/h) for energy efficiency.
   • Provides accurate, proportional pneumatic pressure output from current signal.

IV. Typical Application Scenarios

1. Process Control
   • Pressure, flow, and level control in chemical, petroleum, and pharmaceutical industries.
   • Driving pneumatic actuators in process control systems.
   • Input signal for pneumatic positioners on control/regulating valves.
2. Industrial Automation
   • Control of pneumatic actuators on automated production lines.
   • Air circuit control for robot end-effectors.
   • Material handling systems on automated assembly lines.
3. Energy Industry
   • Pneumatic actuators in boiler and turbine control systems.
   • Pneumatic regulation in gas turbine control systems.
   • Pressure control in thermal systems.
4. Water Treatment
   • Pneumatic valve control in wastewater treatment plants.
   • Flow regulation in water supply and drainage systems.
   • Process control in water treatment.
5. Food & Beverage
   • Pneumatic control in food processing equipment.
   • Pneumatic actuators on beverage filling lines.
   • Air circuit control in packaging machinery.

V. Installation and Usage Precautions
Installation Key Points:

• Pre-installation Check: Inspect product for damage; verify nameplate matches specifications.
• Air Supply Requirements: Use clean, dry air at 0.24–0.7MPa; install a filter and regulator at the supply inlet.
• Piping Connection: Use Rc1/4 fittings; ensure tight, leak-free connections.
• Electrical Wiring: Confirm polarity and signal wire definitions per product label; incorrect wiring can cause damage.
• Mounting Location: Choose a location with minimal vibration and easy access; avoid high temperature, humidity, or corrosive environments.
• Mounting Orientation: Can be mounted in any angle, but the operating angle should match the calibration angle for optimal performance.

Usage Notes:

• Operating Conditions: Do not exceed 0.7MPa; ambient temperature 5–50°C, relative humidity ≤85% RH.
• Medium Requirements: Use clean, dry air; avoid oil, water, and impurities; confirm material compatibility for other media.
• Input Signal: 4–20mADC input current; ensure signal stability and avoid overloading.
• Safety Precautions: Verify explosion-proof rating meets site requirements for hazardous areas; do not exceed rated pressure limits.
• Regular Inspection: Periodically check seals and electrical connections; address leaks promptly.

Maintenance:

• Regular Inspection: Check appearance, seals, and mounting screws for damage or looseness.
• Cleaning: Keep ports clean; perform maintenance with power disconnected.
• Calibration Check: Periodically verify zero and span; recalibrate if necessary.
• Long-Term Storage: Apply anti-corrosion measures if storing long-term; perform periodic operational checks.

VI. Selection Recommendations
Suitable applications for IT601-000-0:

• Applications requiring conversion of 4–20mADC signal to 0.02–0.2MPa pneumatic pressure.
• Supply pressure range of 0.24–0.7MPa.
• Need for high-precision, fast-response I/P conversion.
• Requirement for flameproof/explosion-proof construction for hazardous locations.
• Need for field-adjustable zero and span for easy maintenance.
• Need for flexible mounting orientation.

Selection Calculation Reference:

• Input Signal: Select 4–20mADC or other signal types based on control system.
• Output Pressure Range: Choose range (0.02–0.2MPa or others) based on actuator requirements.
• Supply Pressure: Select based on available plant air supply.
• Accuracy Requirements: Choose appropriate accuracy level (±1% F.S. or higher) based on control needs.
• Explosion-proof Rating: Select appropriate construction based on site hazardous area classification.
• Communication Interface: Select optional interfaces (CC-Link, DeviceNet™, etc.) based on system integration needs.

VII. Summary
The IT601-000-0 is a current-to-pressure converter featuring a torque motor, nozzle-flapper, and pilot valve structure. It offers high-precision control, fast response, explosion-proof safety, excellent temperature stability, easy installation/maintenance, and wide applicability. With its 4–20mADC input, 0.02–0.2MPa output, 0.24–0.7MPa supply pressure, and flameproof construction, it is an ideal choice for process control, industrial automation, energy, water treatment, and food & beverage industries. Through proper selection, correct installation, and regular maintenance, this I/P converter can ensure long-term stable operation, providing a reliable electro-pneumatic signal conversion solution.

IT601-011-6

IT601-111-1J

IT601-331-5BJ

IT601-011-4

IT601-121-6J

IT601-041-6J

IT601-131-2J

IT601-211-4BJ

IT601-361-4B

IT601-300-0BJ

IT601-141-1BJ

IT601-100-0B

IT601-361-2B

IT601-101-2BJ

IT601-040-0B

IT601-201-4

IT601-310-0BJ

IT601-141-3

IT601-011-1J

IT601-231-1

IT601-060-0

IT601-411-3J

IT601-441-6

IT601-261-1J

IT601-411-4BJ

IT601-461-1B