Datalogic makes several contrast sensors (also called mark readers or eye-mark sensors) that look similar on paper. The four models we are asked about most in India are the TL50-W-815, the TL46-W-815, the TLu-115 and the TLu-011. This guide compares them side by side so you can choose the right one for your machine.
Comparison table
| TL50-W-815 | TL46-W-815 | TLu-115 | TLu-011 | |
|---|---|---|---|---|
| Light source | RGB LED | RGB LED | Red / green LED | Red / green LED |
| Operating distance | 9 mm (±3 mm) | 9 mm (approx. 6–12 mm) | 9 mm (±3 mm) | 9 mm (±3 mm) |
| Spot | 1.5 × 5 mm | 1.5 × 5 mm, vertical | 1.5 × 5 mm, vertical | 1.5 × 5 mm, vertical |
| Switching frequency | 15 kHz | 15 kHz | High-speed (see datasheet) | |
| Output | 1 PNP + 1 NPN | PNP or NPN + 0–5 V analogue | PNP + analogue | NPN |
| Connection | M12 4-pin | M12 5-pin | M12 4-pin | 3 m cable |
| Housing | ABS plastic | Aluminium | ZAMA metal | ZAMA metal |
| Protection | IP67 | IP67 | IP67 | IP67 |
| Set-up | MARK / BKGD push-buttons | Teach-in |
Values are typical; we confirm the exact datasheet values for your order code with every quotation.
RGB or red/green light?
The biggest difference is the light source. RGB models (TL50, TL46) can choose red, green or blue light, so they handle difficult colour pairs such as blue on green, yellow on white or marks on metallised film. Red/green models (TLu) work very well for dark marks on light backgrounds, which covers most standard packaging jobs.
Which model should you choose?
- Coloured or low-contrast marks, general packaging: TL50-W-815. RGB light with both PNP and NPN outputs, so it fits most machines.
- Harsh environment, metal housing wanted, RGB needed: TL46-W-815 in an aluminium body, with an analogue output for monitoring.
- Dark marks on light film, PNP PLC, M12 connector: TLu-115.
- Replacing an older NPN sensor with a cable: TLu-011.
Replacing a sensor on an existing machine
When you replace a failed contrast sensor, match three things: the output type (PNP or NPN), the connection (M12 connector or cable) and the mounting. If you change from a TLu to a TL50, for example, check that the output and connector suit your wiring. Send us the code from the old sensor label or a photo and we will confirm the exact replacement.
Frequently asked questions
What is the difference between a contrast sensor and a colour sensor?
A contrast sensor detects the difference in reflected light between a mark and its background, and switches very fast. A true colour sensor compares a colour with a taught reference colour. For registration marks, a contrast sensor is usually the right choice.
Is the TL50-W-815 better than the TLu-115?
Not always. The TL50 has RGB light for difficult colours; the TLu-115 has a metal housing and is ideal for dark marks on light material. Choose based on your mark colours and wiring.
Can these sensors read marks on shiny or metallised film?
Yes, with correct mounting. Tilt the sensor slightly (about 10–15°) so direct reflections do not reach the receiver. RGB models usually handle these materials better.
Which contrast sensor is best for a pouch packing machine?
For dark marks on a light pouch, a TLu-115 or TL46-W-815 works well. For coloured marks, choose an RGB model such as the TL50-W-815.
Read more: TL46-W-815 guide, TL50-W-815 guide, TLu-115 guide, TLu-011 guide and the full contrast sensor range.
Buy from VXT Sensor
VXT Sensor, Noida, supplies genuine Datalogic (Datasensing) sensors across India. Send us the model code or describe your application, and we will confirm the right model, datasheet, price and delivery time. Send an enquiry or call +91 99530 39482.
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