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Laser Displacement Sensors from KEYENCE

GT2 Series

High-precision Contact Digital Sensor
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Specifications 1

Best in Class Performance with the Specifications to Prove it


Sensor heads for the GT2 Air Push Type
Model GT2-A12K GT2-A12KL GT2-A12 GT2-A12L GT2-A32 GT2-A50
Type Standard / Low stress (L) type
(Sensor head for 12 mm 0.47")
Standard type (Sensor head for 32 mm 1.26"/50 mm 1.97" range)
Appearance
Detection system Quartz glass scale, CMOS image sensor projection system,
Absolute type (without tracking error)
Measuring range 12 mm 0.47" 32 mm 1.26" 50 mm 1.97"
Resolution 0.1 μm 0.004 Mil 0.5 μm 0.02 Mil
Accuracy (1) 1 μm 0.04 Mil (p-p) 2 μm 0.08 Mil
(p-p)
3 μm 0.12 Mil
(p-p)
3.5 μm 0.14 Mil
(p-p)
Measuring force (2) Downward mounting 1.2 N 0.4 N 1.2 N 0.4 N 2.1 N 3.2 N
Side mounting 1.1 N 0.3 N 1.1 N 0.3 N 1.8 N 2.8 N
Upward mounting 1.0 N 0.2 N 1.0 N 0.2 N 1.5 N 2.4 N
Operation indicator 2-color LED (red, green)
Applied pressure range 0.25 to 0.5 MPa
Pressure resistance 1.0 MPa
Environmental resistance Enclosure rating IP67 (3) IP67 (3) IP67 (3) IP67 (3)
Ambient temperature 0 to 55ºC (32 to 131ºF)
Relative humidity 35 to 85% RH (No condensation)
Vibration (4) 10 to 55 Hz, 1.5 mm 0.06" double amplitude,
2 hours in each of X, Y, and Z directions
Sensor head cable Optional (M8 connector)
Materials Main body Main body case: Zinc die-casting; Cylinder part: Aluminium alloy;
Air joint resin part: Polyacetal;
Air joint metal part: Brass nickel plating; Indicator: Polyarylate
Dust boot NBR NBR NBR NBR
Contact (5) TYPE304 Stainless steel, super-tough tungsten alloy TYPE304, 440C Stainless steel
Weight (excluding cable) Approx. 145 g Approx. 340 g Approx. 405 g
Accessories Refer to the instruction manual.
*1 Value when ambient temperature is 20ºC (68ºF)
*2 Value at center of measuring range.
Please note that the measurement force changes depending on the installation state of the dust boots.
*3 Make sure the air tube is connected to the air exhaust joint and that no foreign materials enter inside from the joint.
*4 In the case where a mounting bracket D is used with GT2-A32 and GT2-A50, the double amplitude becomes 0.75 mm 0.03".
*5 The contact is included with the sensor.

Sensor head for 12 mm 0.47" (Standard/Low stress (L) type)
Model GT2-H12K GT2-H12KL GT2-H12 GT2-H12L
Appearance
Detection system Quarts glass scale, CMOS image sensor projection system, Absolute type (without tracking error)
Measuring range 12 mm 0.47"
Resolution 0.1 μm 0.004 Mil 0.5 μm 0.02 Mil
Accuracy (20ºC (68ºF)) 1 μm 0.04 Mil (p-p) 2 μm 0.08 Mil (p-p)
Measuring force (1) Downward mounting 1.0 N 0.4 N 1.0 N 0.4 N
Side mounting 0.9 N 0.3 N 0.9 N 0.3 N
Upward mounting 0.8 N 0.2 N 0.8 N 0.2 N
Mechanical response 10 Hz 4 Hz 10 Hz 4 Hz
Probe Carbide ball ø3 Steel ball ø3
Operation indicator 2-color LED (red, green)
Environmental
resistance
Enclosure rating IP67 IP67
Ambient temperature -10 to +55ºC (14 to 131ºF)
Relative humidity 35 to 85% RH (No condensation)
Vibration 10 to 55 Hz, 1.5 mm 0.06" double amplitude, 2 hours in each of X, Y, and Z directions
Sensor head cable Optional (M8 connector)
Materials Main body Main body cast: Zinc die-casting, Indicator: Polyarylate, Dust boot: NBR (2)
Contact TYPE304 Stainless steel, super-tough tungsten alloy TYPE304, 440C Stainless steel
Weight (excluding cable) Approx. 95 g
Accessories Refer to the instruction manual.
*1 Value at center of measuring range.
*2 A dust boot is not provided with the GT2-H12KL or the GT2-H12L.

Sensor head for 32 mm 1.26"/50 mm 1.97" range (Standard/Low stress (L) type)
Model GT2-H32 GT2-H32L GT2-H50
Appearance
Detection system Quarts glass scale, CMOS image sensor projection system, Absolute type (without tracking error)
Measuring range 32 mm 1.26" 50 mm 1.97"
Resolution 0.5 μm 0.02 Mil
Accuracy (20ºC (68ºF)) 3 μm 0.12 Mil (p-p) 3.5 μm 0.14 Mil (p-p)
Measuring force (1) Downward mounting 2.1 N 1.2 N 3.2 N
Side mounting 1.8 N 0.9 N 2.8 N
Upward mounting 1.5 N 0.6 N 2.4 N
Mechanical response 6 Hz 5 Hz 7 Hz
Probe Steel ball ø3
Operation indicator 2-color LED (red, green)
Environmental
resistance
Enclosure rating IP67 IP67
Ambient temperature -10 to +55ºC (14 to 131ºF)
Relative humidity 35 to 85% RH (No condensation)
Vibration 10 to 55 Hz, 1.5 mm 0.06" double amplitude, 2 hours in each of X, Y, and Z directions
Sensor head cable Optional (M8 connector)
Materials Main body Main body cast: Zinc die-casting, Indicator: Polyarylate, Dust boot: NBR (2)
Contact TYPE304, 440C Stainless steel
Weight (excluding cable) Approx. 270 g Approx. 320 g
Accessories Refer to the instruction manual.
*1 Value at center of measuring range.
*2 A dust boot is not provided with the GT2-H32L.

DIN-rail mount type amplifier unit
Model NPN output GT2-71N GT2-72N GT2-71CN GT2-72CN GT2-71MCN
PNP output GT2-71P GT2-72P GT2-71CP GT2-72CP GT2-71MCP
Mounting method DIN-rail mount
Type Standard loose wire type Standard connector type Analog output, connector type
Main unit / Expansion unit (1) Main unit Expansion unit Main unit Expansion unit Main unit
Appearance
Power supply voltage (1) 10 to 30 VDC, including 10% ripple (P-P) 20 to 30 VDC, including 10% ripple (P-P)
Power
consumption (2)
Normal 2200 mW max. (30 V, 73.3 mA max.) 2700 mW max. (30 V, 90 mA max.)
Power saving (Eco) 1700 mW max. (30 V, 56.7 mA max.) 2200 mW max. (30 V, 73.3 mA max.)
Display power Measured value display 6 + 1/2-digit 7-segment LED (red)
Other displays 2-color, 13-level bar LED display (red, green), indicators (red, green)
Display range -199.999.9 to 199.999.9
Display resolution 0.1 μm 0.004 Mil
Sampling rate 1000 times/sec.
Control input Timing input Non-voltage input (Contact, non-contact), Input time: 2 ms min.
Preset input Non-voltage input (Contact, non-contact), Input time: 20 ms min.
Reset input
Bank input
Control
output
HH / High / Go /
low / LL
NPN/PNP open collector, non-voltage output, Applicable current: 50 mA,
Maximum applicable voltage (NPN: 40 V, PNP: 30 V)
Residual voltage at ON: 1 V max. * N.O./N.C switchable
(GT2-71MCN/71MCP: HH and LL are not available.)
Analog output 4 to 20 mA, maximum load resistance: 350 Ω
Analog output range can be changed as desired.
Response time hsp (3 ms), 5 ms, 10 ms, 100 ms, 500 ms, 1 s
Environmental
resistance
Ambient temperature -10 to +50ºC (14 to 122ºF) (GT2-71MCN/71MCP: -10 to +45ºC (14 to 113ºF) when expansion unit (s) is connected)
Relative humidity 35 to 85% RH (No condensation)
Vibration 10 to 55 Hz, 1.5 mm 0.06" double amplitude, 2 hours in each of X, Y, and Z directions
Materials Main body case: Polycarbonate, Key top: Polyacetal, Front sheet: PET, Cable: PVC
Weight GT2-71N/71P/72N/72P: Approx. 140 g (including power cable), GT2-71CN/71CP/72CN/72CP/71MCN/71MCP: Approx. 70 g
Accessories GT2-71N/71P/71CN/71CP/71MCN/71MCP: Instruction manual, Cover seal, GT2-72N/72P/72CN/72CP: None

Panel mount type amplifier unit
Model NPN output GT2-75N GT2-76N GT2-100N GT2-E3N
PNP output GT2-75P GT2-76P GT2-100P GT2-E3P
Mounting method Panel mount Panel mount/Screw mounting using
optional mounting bracket
Installed into GT2-100N/100P
(up to 3 boards)
Main unit / Expansion unit (1) Main unit Expansion unit 2 channels provided as standard. Addition of expansion
boards allows expansion to 11 channels max.
Expansion unit (1 to 3 channels)
Appearance
Power supply voltage (1) 10 to 30 VDC, including 10% ripple (P-P) 20 to 30 VDC, including 10% ripple (P-P) Supplied from GT2-100N/100P
Power
consumption (2)
Normal 2200 mW max. (30 V, 73.3 mA max.) 4500 mW max. (30 V, 150 mA max.) 4200 mW max. (30 V, 140 mA max.)
Power saving (Eco) 1700 mW max. (30 V, 56.7 mA max.) 3600 mW max. (30 V, 120 mA max.) 4000 mW max. (30 V, 133.3 mA max.)
Display power Measured value display 6 + 1/2-digit 7-segment LED (red)
Other displays 2-color, 13-level bar LED display (red, green), indicators (red, green)
Display range -199.999.9 to 199.999.9
Display resolution 0.1 μm 0.004 Mil
Sampling rate 1000 times/sec.
Control input Timing input Non-voltage input (Contact, non-contact), Input time: 2 ms min.
Preset input Non-voltage input (Contact, non-contact), Input time: 20 ms min.
Reset input
Bank input
Control
output
HH / High / Go /
low / LL
NPN/PNP open collector, non-voltage output, Applicable current: 50 mA,
Maximum applicable voltage (NPN: 40 V, PNP: 30 V)
Residual voltage at ON: 1 V max. * N.O./N.C switchable
(Applicable current decreases to 20 mA or lower when 2 or more sensor heads are connected to the GT2-100 Series.)
Response time hsp (3 ms), 5 ms, 10 ms, 100 ms, 500 ms, 1 s
Environmental
resistance
Ambient temperature -10 to +50ºC (14 to 122ºF)
Relative humidity 35 to 85% RH (No condensation)
Vibration 10 to 55 Hz, 1.5 mm 0.06" double amplitude, 2 hours in each of X, Y, and Z directions (GT2-100N/P: 0.15 mm 0.01" double amplitude)
Materials Main body case: Polycarbonate, Key top: Polyacetal, Front sheet: PET, Cable: PVC (GT2-75N/75P/76N/76P only)
Power supply / I/O cable 12-core connector connection (Connecting cable included) Power supply: Terminal block,
I/O: 20-pin connector (MIL standard)
I/O: 30-pin connector (MIL standard)
Weight GT2-75N/75P/76N/76P: Approx. 140 g (including panel mounting bracket, protective front cover and power cable)
GT2-100N/100P: Approx. 380 g, GT2-E3N/E3P: Approx. 80 g
Accessories GT2-75N/75P: Panel mounting bracket, protective front cover, power cable, instruction manual, cover seal
GT2-76N/76P: Panel mounting bracket, protective front cover, power cable, expansion cable
GT2-100N/100P: Instruction manual, panel mounting bracket, GT2-E3N/E3P: None
*1 Precautions when the GT2-70 Series is used with an expansion unit (excluding GT2-71D) Up to 15 amplifi er units can be connected; main unit: 1 unit, expansion unit: 14 units. To use the DIN-rail mount type and additional units, be sure to use the end units (OP-26751). When mounting additional units, depending on the number of units to be added, confi rm the following specifi cation limitations.
[Up to 8 units (including main unit)]
• The power supply voltage is 20 to 30 VDC.
• The maximum applicable current for each output is 20 mA.
[Up to 9 to 15 units (including main unit)]
• The power supply voltage is 20 to 30 VDC.
• The maximum applicable current for each output is 10 mA (including DL-RB1A output current).
*2 For GT2-100 Series, when the maximum number of sensor heads are connected and all units are set to power saving mode

DIN-rail mount type pulse output amplifier unit
Model GT2-71D
Appearance
Mounting method DIN-rail mount
Power supply voltage 10 to 30 VDC, including 10% ripple (P-P)
Current consumption 1600 mW (30 V, 53.3 mA max.)
Indicator Power supply (green)/Alarm (red) indicator,
pulse output indicator (green), input indicator (green)
Pulse resolution Selectable from 0.1 μm 0.004 Mil, 0.5 μm 0.02 Mil, 1 μm 0.04 Mil, and 10 μm 0.39 Mil (Factory setting: 0.5 μm 0.02 Mil)
Minimum phase difference Selectable from 0.5 μs, 2.5 μs, 5 μs, and 25 μs (Factory setting: 2.5 μs)
Control input Origin return Input time: 20 ms min.
Output signal 90º phase difference, differential square wave (EIA-422 compliant)
Output signal level +5V, øA, øA-, øB, øB-, øZ, øZ-: Line driver output
Environmental
resistance
Ambient temperature -10 to +50ºC (14 to 122ºF)
Relative humidity 35 to 85% RH (No condensation)
Vibration 10 to 55 Hz, 1.5 mm 0.06" double amplitude,
2 hours in each of X, Y, and Z directions
Material Main body case: Polycarbonate, Cable: PVC
Weight Approx. 110 g (including power supply cable)
Accessories Instruction manual, SW protection sticker

Communication unit (common specifications)
Model DL-RB1A DL-RS1A
Appearance
Power supply voltage 20 to 30 VDC, including ripple,
Ripple (P-P): 10% max.
(Supplied via connected sensor amplifier)
Power consumption 27 mA max. 27 mA max.
Number of connectable sensor
amplifiers
Up to 15 units (including main unit)
Indicator Alarm indicator lamp
(red),
Power indicator lamp
(green)
Communication
indicator lamp
(green x 2),
Alarm indicator lamp
(red),
Power indicator lamp
(green)
Environmental
resistance
Ambient temperature -10 to +55ºC (14 to 131ºF)
Relative humidity 35 to 85% RH (No condensation)
Vibration 10 to 55 Hz,
1.5 mm 0.06" double amplitude,
2 hours in each of X, Y, and Z directions
Material Main body case: Polycarbonate
Weight Approx. 46 g Approx. 53 g
Accessories Instruction manual, End units (x 2),
Switch protection seal,
Expansion connector cover

Communication unit (DL-RS1A communication specifications)
Model DL-RS1A
Appearance
Communication method Full duplex
Synchronization method Start-stop
Transmission code ASCII
Baud rate 2400/4800/9600/19200/38400 bps
selectable (Factory-setting: 9600 bps)
Date bit length 8-bit/7-bit selectable (Factory-setting: 8 bits)
Parity check None/Even/Odd selectable
(Factory- setting: None)
Stop bit length 1 bit
Data delimiter Data reception: automatically recognizes CR
or CR+LF
Data transmission: Fixed to CR+LF



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