Keyence GT-72A General Purpose Digital Contact Sensor

The Keyence GT-72A is a DIN-rail-mounted expansion amplifier unit engineered for precision digital contact sensing in demanding industrial applications. Compatible with the GT-70A main unit, it delivers ultra-fast sampling at 2,000 Hz, a high-resolution 6-digit LED display, selectable response times, and power-saving Eco Mode. With NPN open collector output and up to 10-unit expandability, the GT-72A is ideal for real-time measurement tasks in automation, inspection, and positioning systems.

Technical Specifications

Model: GT72A
Type: Expansion Amplifier Unit (NPN)
Mounting: DIN Rail (Metal DIN Plate Required)
Main/Expansion: Expansion Unit (GT-70A Main Unit Required)

Display & Measurement

Display Type:

• 6-Digit, 7-Segment LED (Red)
• 2-Color, 13-Level Bar LED (Red/Green)
• Status Indicators: Red & Green

Display Range: -99.999 to 999.999
Resolution: 1 µm
Sampling Rate: 2,000 samples/sec

Input & Output Specifications

Control Input:

• Timing Input: Non-voltage (2 ms or more)
• Preset/Bank Input: Non-voltage (20 ms or more)

Control Output:

• NPN Open Collector: HIGH / GO / LOW
• Max Load: 50 mA @ 40 V Max
• Residual Voltage: ≤ 1 V
• Switchable: Normally Open / Normally Closed

Response Time (Selectable):

• 1.5 ms (High-Speed Mode)
• 5 ms / 10 ms / 100 ms / 500 ms / 1 s / 5 s

Power & Electrical

Power Supply: 12 to 24 VDC (Ripple P-P ≤10%)
Note: Use 24 VDC when adding expansion units

Power Consumption:

• Normal Mode:
  • 12V: 1,140 mW (95 mA)
  • 24V: 1,200 mW (50 mA)
• Eco Mode:
  • 12V: 600 mW (50 mA)
  • 24V: 840 mW (35 mA)

Environmental Specifications

Operating Temperature: -10°C to +55°C (No Freezing)
Relative Humidity: 35% to 85% RH (No Condensation)
Vibration Resistance: 10–55 Hz, 1.5 mm Double Amplitude, 2 Hours in X, Y, Z

Material & Construction

Body Case: Polycarbonate
Key Top: Polyacetal
Front Sheet: Polycarbonate
Cable: PVC
Weight: Approx. 110 g (Including Cable)

Key Features & Benefits

✅ Fast 2,000 Hz Sampling: Reliable real-time feedback for high-speed processes.

✅ Flexible Output Logic: NPN configuration with N.O./N.C. switching.

✅ Multi-Bank Storage: 4 memory banks for fast recall of measurement settings.

✅ Eco Mode Efficiency: Reduces power usage without performance loss.

✅ Clear Visual Indicators: Multi-color LED and high-resolution numeric display.

✅ Scalable Design: Supports up to 10 units for large system integration.

✅ Built-In Functions: Preset, Hold, Variable Hysteresis, Core Alarm, Calibration.

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