www.balluff.com - 1-800-543-8390
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Product Overview
The BLT 31M sensor effectively detects UV luminescent materials and markers. The modulated UV light
source in the BLT 31M is directed toward a target and the visible light, resulting from the fluorescence of
the material, is reflected back to the sensor. When the reflected light level exceeds the threshold the discrete
output changes state. Due to the fast response of the sensor, it is suitable for use in high-speed applications.
The 50mm lens accessory allows for very small spot size for fine resolution applications. The sensor
provides both an analog and a discrete output. The analog output signal has a 0 to 5 V range with 20mV
resolution. A PLC or a computer can be used to process the analog output and monitor the status of the
discrete output signal.
The BLT 31M is a reliable, compact sensor with long range sensing capabilities. Two seven segment
displays provide visual representation of the relative intensity from 00 to 50. Easy two step sensitivity, and
3 LED intensity settings provide for flexible operation over wide range of distances and materials.
Specifications
UV light source
370nm UV LED, min.100,000 hours
LED Intensity
3 levels (low, medium and high)
Relative Intensity Display Range
00 to 50
Sensitivity
X1, X10
Detection Range
Up to 12” (300mm) Depending on model
Switching Frequency
6 kHz
Brightness level
Two 7 segment digits
Brightness threshold
Two 7 segment digits
Analog Output
0 – 5 V (20mV resolution)
Digital Output
Auto-Detect PNP / NPN
Extend Output Pulse
0 - 90 mS (10 steps)
Output Function
NO/NC selectable
On/Off Delay
<50 uS
Security
Remote LOCK / UN-LOCK
Power indicator
Green LED 7 segment display
Detect indicator
Red LED
Programming indicator
Green LED
Security
Remote LOCK / UN-LOCK
Data retention
EEPROM non—volatile memory
Dimensions
2.0”(51mm) x 2.4”(61mm) x 0.9”(23mm)
Weight
0.21 lbs. (95 g)
Supply Voltage
10…24 VDC
Operating Current
60 mA
Short Circuit Protection
Yes (Outputs)
Overload / Reverse Polarity Protection Yes (Supply Voltage)
Operating temperature
-20ºC…55ºC
Storage temperature
-20ºC…70ºC
Housing
Metal alloy
Mechanical protection
IP67
