Keyence GT2-72CP Amplifier Analog Expansion

Keyence GT2-72CP Digital Contact Sensor Amplifier Expansion Unit with Analog Output

Product Introduction

The Keyence GT2-72CP is a high-accuracy digital contact sensor amplifier unit in the GT2 series. Keyence designed this model as an expansion unit with both switching and analog outputs. Specifically, it delivers a display resolution of 0.1 µm for precise inspection. The GT2-72CP also provides a 4-20 mA analog output, which supports continuous data logging. Furthermore, its DIN-rail mount design simplifies panel installation. Because it is an expansion unit, it requires a main amplifier to operate. The unit accepts a wide supply voltage range of 10 to 30 VDC. In addition, it offers PNP open collector outputs for reliable signal transfer. Therefore, it suits multi-channel systems that need both judgment signals and trend data.

Technical Specifications

The GT2-72CP amplifier offers a broad display range. It covers -199.999.9 to 199.999.9 for flexible measurement. Furthermore, the display resolution reaches 0.1 µm for fine detection. The response time is selectable across several settings. For standard GT2 heads, options include hsp(3)/5/10/100/500/1,000 ms. Meanwhile, when using GT2-Pxxx heads, the choices become hsp(12)/20/40/400/2,000/4,000 ms.

Control input supports timing, preset, reset, and bank no-voltage input. Besides, the output type is HH/HI/GO/LO/LL PNP open collector. The output rating is 40 V / 50 mA or less with residual voltage of 1 V or less. Additionally, the analog output provides 4 to 20 mA with a maximum load resistance of 350 Ω. Power consumption stays at 2,200 mW or less. At 30 V, the current draw is 73.3 mA or less. The unit has no built-in communication ports or protocols. However, communication expansion is possible via optional GT2 series communication units, sold separately.

Mechanical and Environmental Parameters

The Keyence GT2-72CP operates in temperatures from -10 to +50 °C without freezing. Relative humidity should stay between 35 and 85 % RH with no condensation. The unit weighs approximately 140 g including the power cable. Unfortunately, dimensions and storage temperature are not available in the standard specification. Likewise, the protection rating is not published for this model. Nevertheless, the DIN-rail mounting system ensures a secure fit inside control cabinets. Meanwhile, the compact housing saves panel space when several units sit side by side.

Installation Guide

First, mount the GT2-72CP on a standard DIN rail next to a GT2 main amplifier. Next, connect the expansion unit to the main unit using the supplied connection cable. Then, attach the sensor head to the amplifier unit. After that, wire the control inputs for timing, preset, reset, or bank selection. Moreover, connect the PNP open collector outputs to your PLC or controller. In addition, route the 4-20 mA analog output to a recorder or analog input card. Keep the load resistance below 350 Ω for accurate readings. Finally, set the response time and display parameters through the front panel. Always follow Keyence guidelines for grounding and cable routing. This approach reduces electrical noise and ensures stable readings.

Packaging List

• 1 × Keyence GT2-72CP amplifier expansion unit

• 1 × Power cable

• 1 × Mounting bracket

• 1 × Instruction sheet

• Shipping via Fedex, UPS, DHL

FAQ

Q1: What is the difference between the GT2-72CP and the GT2-71CP?
A: The GT2-72CP is an expansion unit, while the GT2-71CP is a main unit. Specifically, the expansion unit requires a main amplifier to operate. It adds analog channels but does not work as a standalone controller.

Q2: What is the analog output rating on this amplifier?
A: The GT2-72CP provides a 4 to 20 mA analog output. The maximum load resistance is 350 Ω. Therefore, verify your recording device stays within this limit.

Q3: Does the GT2-72CP have built-in communication ports?
A: No, the standard unit lacks built-in ports and protocols. However, you can add optional GT2 series communication units for network connectivity. These units are sold separately.

Q4: How do I mount the GT2-72CP in a control panel?
A: The unit uses DIN-rail mounting. First, snap it onto a standard DIN rail beside a main amplifier. Next, secure the power, sensor, and analog connections. Finally, verify the supply voltage stays within 10 to 30 VDC.

Q5: What is the response time range for the GT2-72CP?
A: Response time depends on the sensor head. For standard heads, choices range from hsp(3) to 1,000 ms. For GT2-Pxxx heads, options range from hsp(12) to 4,000 ms.