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KEYENCE GT2-71MCN amplifier unit
The KEYENCE GT2-71MCN is the NPN analog-output main unit of the GT2 series. It has a 6½-digit LED display (0.1 μm resolution), a 4–20 mA analog output (350 Ω max. load) and NPN open-collector 5-level judgment outputs (HH / HI / GO / LO / LL). It mounts on a DIN rail, offers selectable response from 3 ms, and has an IP67 front panel — for precision dimensional quality control and automatic in-line thickness / height judgment.
Specifications
| Item | GT2-71MCN |
|---|---|
| Model / type | GT2-71MCN / NPN analog-output main unit |
| Mounting | DIN rail |
| Power supply | 20–30 VDC, ripple ±10% (Class 2) |
| Power consumption | Standard ≤2,700 mW (30 V / 90 mA); eco mode ≤2,200 mW (73.3 mA) |
| Display | 6½-digit red 7-segment LED (−199,999.9 to +199,999.9); 0.1 μm resolution; two-color 13-segment bar LED |
| Control (judgment) output | NPN open collector, 5 levels (HH / HI / GO / LO / LL); max. 40 V / 50 mA; residual voltage ≤1 V |
| Analog output | 4–20 mA; max. load resistance 350 Ω |
| Response time | hsp (3 ms) / 5 / 10 / 100 / 500 / 1000 ms selectable |
| Operating environment | −10 to +50°C (+45°C with expansion units); 35–85% RH |
| Front panel protection | IP67 |
| Weight | Approx. 70 g (polycarbonate housing) |
Outputs
| Output | Specification | Typical use |
|---|---|---|
| 4–20 mA analog | Proportional to measured displacement, max. load 350 Ω | To PLC analog input, recorder or DCS for trend monitoring and SPC |
| NPN 5-level judgment (HH / HI / GO / LO / LL) | Adjustable thresholds, NPN open collector 50 mA | PLC digital input receives GO / NG to drive alarms or reject defective parts |
| Two-color bar LED | 13-segment green / red display | Operators see at a glance whether the value is within tolerance |
GT2 system configuration
- Main unit (GT2-71MCN): this product — processes the GT2 sensor signal, displays the value and outputs analog and judgment signals.
- Sensor head (GT2-H series): contact displacement sensor head, sold separately; choose by measuring range and accuracy.
- Expansion units: the GT2-71MCN supports side-by-side expansion to manage multiple measuring channels (operating temperature limit drops to +45°C).
- Response: hsp (3 ms) for high-speed lines; 100 ms for stable measuring conditions.
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