Keyence GT-75A Digital Contact Sensor Amplifier – Panel Mount, NPN Output
The GT-75A from Keyence is a main unit digital contact sensor amplifier. It belongs to the GT series. This panel mount unit delivers fast, precise measurement for industrial automation. It offers a 1 µm display resolution and a 2,000 times/second sampling rate. The NPN open collector output supports HIGH/GO/LOW judgment. Response time is selectable from 1.5 ms to 5 s. This amplifier is active and in production. It suits tight spaces and demanding factory floors.
Technical Specifications
| Brand | Keyence |
| Model | GT-75A |
| Series | GT series |
| Type | Digital contact sensor amplifier unit |
| Mounting | Panel mount, main unit |
| Display range | -99.999 to 999.999 |
| Resolution | 1 µm |
| Sampling rate | 2,000 times/second |
| Response time | hsp (1.5 ms), 5 ms, 10 ms, 100 ms, 500 ms, 1 s, 5 s (selectable) |
| Supply voltage | 12 to 24 VDC, ripple (p-p) 10 % or less |
| Power consumption | Normal: 1,140 mW (95 mA) or less at 12 V / 1,200 mW (50 mA) or less at 24 V Eco mode: 600 mW (50 mA) or less at 12 V / 840 mW (35 mA) or less at 24 V |
| Output type | HIGH/GO/LOW NPN open collector, max. 50 mA (40 V or less), residual voltage 1 V or less, N.O./N.C. selectable |
| Operating temperature | -10 to +55 °C (No freezing) |
| Relative humidity | 35 to 85 % RH (No condensation) |
| Weight | Approx. 110 g (including power cable) |
| Communication | No built-in ports. No protocols. Expand via optional GT series communication units (sold separately). |
| Protection rating | Not available |
| Dimensions (H×W×D) | Not available |
| Storage temperature | Not available |
Measurement range: -99.999 to 999.999. Frequency response: selectable from 1.5 ms to 5 s. Sensitivity: 1 µm resolution. Linearity: depends on sensor head. Temperature range: -10 to +55 °C. Environmental resistance: 35 to 85 % RH, no condensation. Noise immunity: typical industrial EMC. The unit uses NPN open collector outputs for reliable switching.
Installation Guide
- Mount the GT-75A on a panel. Use the main unit only.
- Connect a 12 to 24 VDC power supply. Keep ripple below 10 %.
- Wire the NPN output. Select N.O. or N.C. as needed.
- Attach a compatible GT series sensor head.
- For communication, add an optional GT communication unit.
- Keep the unit dry. Avoid freezing and condensation.
- Do not exceed 50 mA output current.
Debugging and Maintenance
The GT-75A offers a clear display for easy setup. Use the response time selector to match your machine cycle. The Eco mode cuts power by up to 50 %. No special tools are needed for panel mounting. Regular checks include verifying supply voltage and output load. Clean the display with a dry cloth. The unit has no user-serviceable parts inside. For advanced diagnostics, use an optional communication unit with GT series software.
Compatibility Notes
This amplifier works with Keyence GT series sensor heads. It supports NPN input devices. For network or serial communication, you must add a GT series communication unit. The GT-75A does not have built-in ports. It is a main unit only. It replaces similar GT series amplifiers in existing panels.
Certifications
Keyence confirms active production status as of 2026-09. The GT-75A meets general industrial standards. Specific certification marks are not listed in the official spec. Contact us for details on CE or other approvals.
Package Contents
- GT-75A amplifier unit
- Power cable
- Instruction sheet (if supplied by Keyence)
- Original packaging
Weight is approximately 110 g including the power cable.
Warranty and Shipping
All units come with a 12-month warranty. We ship via FedEx, UPS, and DHL. Tracking is provided. Orders ship within 1-2 business days after verification.
Typical Applications
- Position verification on assembly lines
- Thickness or gap measurement
- Press-fit and insertion checks
- Part presence and absence detection
- Quality gate sorting with HIGH/GO/LOW output
- Retrofit of obsolete control systems
Diagnostic Capabilities
The GT-75A shows live measurements on its display. It provides HIGH, GO, and LOW judgment outputs. You can set response times to filter noise. The Eco mode helps identify power issues. For deeper diagnostics, add a communication unit to read data in real time. The NPN output drives PLCs, counters, and relays directly.
FAQ
Q: Does the GT-75A have built-in communication?
A: No. You need an optional GT series communication unit.
Q: What is the output type?
A: NPN open collector, max 50 mA, 40 V or less.
Q: Can I use it with a 24 VDC supply?
A: Yes. It accepts 12 to 24 VDC with ripple 10 % or less.
Q: What is the resolution?
A: 1 µm.
Q: Is the unit still in production?
A: Yes. Keyence confirms active status as of 2026-09.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipment support to your door.
- Tested industrial surplus and refurbished options.
- 12-month warranty on every unit.
- Technical verification before shipment.
- Support for obsolete control systems.
Contact us for inquiries: info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).
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