Keyence GT2-71N Main Amplifier NPN Output 10-30VDC GT2 Series Unit

GT2-71N | Keyence | Amplifier Unit

GT2-71N is a main amplifier unit from Keyence. It uses NPN output and mounts on a DIN rail. This unit powers your measurement system. It works with 10 to 30 VDC. The display shows clear readings. The red LED shows values. A 13-level bar LED shows status. This unit is the main model. Expansion units connect to it for more channels.

Technical Data

• Brand: Keyence
• Model: GT2-71N
• Product Type: Amplifier Unit
• Output: NPN output
• Mounting: DIN-rail mount
• Unit Role: Main unit
• Power Supply: 10 to 30 VDC, 10 % ripple (P-P), Class 2
• Power Consumption: Normal 2,200 mW max. (30 V, 73.3 mA max.)
• Power Saving Mode: 1,700 mW max. (30 V, 56.7 mA max.)

Display

• Measured value: 6 + 1/2-digit 7-segment LED (red)
• Other: 2-color 13-level bar LED (red, green), indicators (red, green)
• Display range: -199.999.9 to 199.999.9
• Display resolution: 0.1 μm 0.004 Mil

Input and Output

• Control input: Timing/preset/reset/bank input, no-voltage input
• Control output: HH/HI/GO/LO/LL, NPN open collector, 40 V 50 mA or less, residual voltage 1 V or less
• Analog output: Not available on this model

Response Time

• Standard: hsp(3)/5/10/100/500/1,000 ms
• With GT2-Pxxx: hsp(12)/20/40/400/2,000/4,000 ms

Environmental Resistance

• Ambient temperature: -10 to +50 °C 14 to 122 °F (GT2-71MCN/71MCP: -10 to +45 °C 14 to 113 °F when expansion units connect)
• Relative humidity: 35 to 85 % RH (No condensation)
• Vibration resistance: 10 to 55 Hz, Double amplitude 1.5 mm 0.06″, 2 hours in each of X, Y, and Z directions

Material and Weight

• Main body case: Polycarbonate
• Key top: Polyacetal
• Front sheet: PET
• Cable: PVC
• Weight: Approx. 140 g (including power cable)

Installation Guide

• Mount the unit on a DIN rail. Use standard 35 mm rail.
• Keep the unit away from high voltage lines. This reduces noise.
• Connect power supply within 10 to 30 VDC. Check ripple is under 10 %.
• Use a Class 2 power source for safety.
• Leave space around the unit for air flow. Do not block vents.
• Connect control input wires to timing or reset pins. Use no-voltage contacts.
• For output, use NPN open collector. Max load is 40 V, 50 mA.

Debug and Maintenance Convenience

• Use the front keys to set parameters. The 7-segment LED shows values clearly.
• Switch to Eco mode to save power. Power drops to 1,700 mW.
• Check the 13-level bar LED for quick status. Red and green colors show pass or fail.
• Clean the front sheet with a soft dry cloth. Do not use solvents.
• Reset the unit if readings seem wrong. Use the reset input or key.

Compatibility Notes

• This is a main unit. It works alone or with expansion units.
• Expansion units like GT2-71MCN or GT2-71MCP connect to it. Note the temperature limit drops to +45 °C when you add expansions.
• Use with GT2-Pxxx sensor heads. Response time changes as listed above.
• NPN output works with most PLCs and controllers that accept NPN signals.
• Not compatible with PNP input devices directly. Use a converter if needed.

Certifications and Packaging

• This unit meets Keyence quality standards. Check local rules for CE or UL marks.
• Package includes: GT2-71N amplifier unit, power cable, and manual.
• Warranty: 12 months from date of shipment.
• Shipping: Orders ship in 12 to 24 hours.
• Carriers: Fedex, UPS, DHL for fast delivery.

Expert Review

The GT2-71N is a solid choice for factory automation. It gives fast readings and clear displays. The DIN rail mount saves panel space. The Eco mode cuts power use. The NPN output fits many control systems. The response time options let you match speed to your task. This unit is reliable for daily use. The 12-month warranty adds peace of mind.

Manager’s Insight

From a manager’s view, the GT2-71N lowers downtime. The clear bar LED helps operators spot issues fast. The no-voltage input works with simple switches. The unit handles 10 to 30 VDC, so it fits common power supplies. When you add expansion units, you get more channels without a new main unit. This saves cost. The 12-24 hour shipping means you get parts quickly. For high-volume lines, keep spare units on hand.

Best Applications and Equipment

• Use with GT2 series sensor heads for measurement.
• Ideal for automotive parts inspection. Check gaps, height, and position.
• Works in electronics assembly. Measure small parts with 0.1 μm resolution.
• Good for packaging lines. Detect fill levels or label position.
• Fits CNC machines for tool wear checks.
• Use with PLC systems that accept NPN open collector signals.
• Works in robotic cells for part presence or alignment.

FAQ

Q: What is the main difference between the GT2-71N and an expansion unit?

A: The GT2-71N is a main unit. It has the display and power supply. Expansion units add channels but need a main unit to work. Also, when you connect expansions, the max ambient temperature drops to +45 °C.

Q: Can I use this unit with a PNP sensor?

A: No. The GT2-71N has NPN output. It works with NPN inputs. For PNP, you need a different model or a signal converter.

Q: How do I set the response time?

A: Use the front keys. Select from hsp(3), 5, 10, 100, 500, or 1,000 ms. With GT2-Pxxx heads, the choices change to hsp(12), 20, 40, 400, 2,000, or 4,000 ms.

Q: What is Eco mode and why use it?

A: Eco mode cuts power use. Normal mode draws 2,200 mW max. Eco mode draws 1,700 mW max. Use it when you want to save energy. The display still works.

Q: How fast can I get this unit?

A: We ship in 12 to 24 hours. We use Fedex, UPS, or DHL. You get tracking info fast.

Q: What if the display shows an error?

A: Check power supply first. Make sure it is 10 to 30 VDC. Check wiring for loose connections. Press reset. If the error continues, contact support.

Q: Do I need a special cable?

A: The unit comes with a power cable. For sensor connections, use the cable that matches your GT2 sensor head. Keep cables away from motor lines to reduce noise.

Q: Can I mount this unit outdoors?

A: No. The unit is for indoor use. It has no water or dust protection. Keep it in a cabinet or panel. Ambient temperature must stay between -10 and +50 °C.

Buying Guide

• Check your control system input type. GT2-71N is NPN. Do not buy if you need PNP.
• Count your channels. If you need more than one, buy expansion units. Remember the temperature limit.
• Match sensor heads. Use GT2-Pxxx for fast response. Check the response time table.
• Plan for power. The unit needs 10 to 30 VDC. Use a Class 2 supply.
• Order spare units for critical lines. Shipping is fast, but spares cut downtime.
• Check the warranty. It covers 12 months. Keep your invoice.
• For help, contact us. Email: sales@powergearx.com or WhatsApp: +86 18030005825.

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