GT-72A Keyence Digital Contact Sensor Amplifier | GT Series Expansion Unit
The GT-72A is a Keyence GT series digital contact sensor amplifier. It is a DIN-rail mount expansion unit. It delivers fast, stable measurement for industrial automation. The 1 µm display resolution and 2,000 times/second sampling support precise inline inspection. The unit uses NPN open collector output with selectable N.O./N.C. logic. It connects to optional GT series communication units for network expansion. This amplifier suits tight panel spaces and long-term factory use.
Model: GT-72A
Brand: Keyence
Series: GT series
Type: Digital contact sensor amplifier unit
Mounting: DIN-rail mount, expansion unit
Technical Specifications
| Brand | Keyence |
| Model | GT-72A |
| Series | GT series |
| Device Type | Digital contact sensor amplifier unit |
| Mounting | DIN-rail mount, expansion unit |
| Display Range | -99.999 to 999.999 |
| Display 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) |
| Measurement Range | Depends on connected GT sensor head |
| Frequency Response | Up to 2,000 Hz sampling; response selectable from 1.5 ms |
| Sensitivity | 1 µm display resolution |
| Linearity | Depends on paired GT sensor head |
| Temperature Range | -10 to +55 °C (No freezing) |
| Humidity | 35 to 85 % RH (No condensation) |
| Environmental Resistance | Stable in factory conditions; no freezing or condensation |
| Noise Immunity | Designed for industrial environments; stable with stable 12 to 24 VDC supply |
| 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: 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 |
| Output Rating | Max. 50 mA (40 V or less), residual voltage 1 V or less |
| Output Logic | N.O./N.C. selectable |
| Built-in Ports | None |
| Protocols | None |
| Communication Expansion | Via optional GT series communication units (sold separately) |
| Dimensions (H×W×D) | Not available |
| Weight | Approx. 110 g (including power cable) |
| Protection Rating | Not available |
| Storage Temperature | Not available |
| Lifecycle | Active; official Keyence production status confirmed via product/spec page (Last verified: 2026-09) |
Installation Guide
- Mount the GT-72A on a standard DIN rail.
- Use it as an expansion unit beside a compatible GT series amplifier.
- Keep the panel dry and free from condensation.
- Route power and signal cables away from high-noise lines.
- Confirm 12 to 24 VDC supply before power-on.
- Check ripple is 10 % (p-p) or less.
- Connect the sensor head according to the GT series layout.
- Set response time based on machine speed and stability needs.
Setup and Maintenance Convenience
- DIN-rail mount saves panel space and speeds replacement.
- Expansion unit design supports multi-channel builds.
- Selectable response time balances speed and signal stability.
- N.O./N.C. output logic adapts to different PLC inputs.
- Eco mode lowers power use in continuous operation.
- Routine checks include supply voltage, wiring, and display stability.
- Clean the display area with a dry, soft cloth only.
- Do not open the housing; no user-serviceable parts inside.
Compatibility Notes
- Works within the Keyence GT series ecosystem.
- Pairs with compatible GT series sensor heads.
- Adds communication via optional GT series communication units.
- No built-in network port or protocol support.
- NPN output suits common industrial PLC and relay inputs.
- Confirm sensor head and amplifier pairing before order.
Certification Information
Certification details are not listed in the supplied source data. Please confirm current compliance documents with Keyence or your supplier before use. Oiltech Controls verifies product identity and condition before shipment.
Packing List
- 1 × Keyence GT-72A amplifier unit
- 1 × power cable
- Protective packing for transit
- Order and warranty documents as applicable
Warranty and Shipping
- 12-month warranty covers eligible defects.
- Shipping options include FedEx, UPS, and DHL.
- Tracking is provided after dispatch.
- Packing follows industrial spare parts handling standards.
Typical Applications
- Inline dimensional checks on production lines.
- Position verification for fixtures and moving parts.
- Thickness and step measurement in automated cells.
- Go/no-go inspection with HIGH/GO/LOW judgment output.
- Retrofit of older GT series measurement systems.
- Panel builds needing compact DIN-rail amplifiers.
Diagnostic Capability
- HIGH/GO/LOW output supports quick pass/fail logic.
- Stable display helps spot sensor alignment issues.
- Selectable response time helps reduce false triggers.
- Eco mode helps confirm low-power operation.
- No built-in communication diagnostics without optional units.
- Fault tracing relies on PLC input status and display reading.
Why Buy From Oiltech Controls?
- More than 15 years in industrial automation spare parts.
- Worldwide shipment support for hard-to-find items.
- Tested industrial surplus and refurbished options available.
- 12-month warranty on eligible products.
- Technical verification before every shipment.
- Support for obsolete control systems and legacy panels.
FAQ
Q: What is the GT-72A?
A: It is a Keyence GT series digital contact sensor amplifier expansion unit.
Q: Does it have built-in communication?
A: No. It needs optional GT series communication units for network use.
Q: What output does it provide?
A: It provides HIGH/GO/LOW NPN open collector output.
Q: What is the display resolution?
A: The display resolution is 1 µm.
Q: How fast does it sample?
A: It samples at 2,000 times per second.
Q: What is the supply voltage?
A: It uses 12 to 24 VDC with ripple 10 % (p-p) or less.
Q: What is the warranty?
A: Oiltech Controls offers a 12-month warranty on eligible items.
Q: How does it ship?
A: We ship by FedEx, UPS, or DHL.
Q: Can you support obsolete systems?
A: Yes. We support obsolete control systems and legacy automation parts.
Contact us for inquiries: info@oiltechcontrols.com or +86 158 8020 0923.
Copyright © 2026 Oiltech Controls Limited. All rights reserved.
Original Source: https://www.oiltechcontrols.com/
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