From Mechanical Trips to Optical Precision: The Evolution of Level Sensing

For decades, oil and gas operators relied on mechanical floats, trip switches, and contact probes to monitor levels and positions. These devices worked, but they wore out, clogged, and demanded frequent maintenance. The SICK DT50-P1123 represents the next step in that evolution: a non-contact optical time-of-flight sensor that measures distances up to 10,000 mm on natural objects without a reflector. Built for demanding environments, it brings field-proven reliability to mission-critical measurement points.

Why the DT50-P1123 Excels in Harsh Conditions

This unit belongs to the SICK Dx50 series and uses HDDM™ (High Definition Distance Measurement) optical time-of-flight technology. This principle delivers stable readings even under changing ambient light. A visible red laser diode (658 nm) provides a clear alignment aid, while Class 1 eye-safe certification per IEC 60825-1:2014 simplifies on-site handling.

Key technical parameters include:

• Measurement range: 200 mm ... 10,000 mm on 90% remission targets; 200 mm ... 6,500 mm on 18% remission; 200 mm ... 4,000 mm on 6% remission.
• Measurement accuracy: Typ. ± 10 mm, with repeatability of ≥ 2.5 mm.
• Response time: 20 ms (fast) or 30 ms (slow) via averaging setting.
• Supply voltage: DC 10 V ... 30 V, reverse-polarity protected.
• Power consumption: ≤ 2.1 W without external load.
• Operating temperature: -30 °C ... +65 °C as standard; up to +80 °C with two cooling plates; up to +140 °C with two cooling plates and a protection filter (Uv ≤ 24 V).
• Storage temperature: -40 °C ... +75 °C.
• Enclosure rating: IP65 per EN 60529.
• Housing: Zinc die-cast (ZNAL4CU1) with acrylic glass (PMMA) optical window.
• Weight: Approx. 200 g.
• Electrical connection: Male connector M12, 5-pin.
• Outputs: 1x PNP digital (≤ 100 mA) and 1x analog current (4 mA ... 20 mA, ≤ 300 Ω, 16-bit); multifunctional input.

How Does This unit Improve Oil & Gas Operations?

Non-contact measurement eliminates wear from moving parts and reduces contamination risk. In tank farms, This unit can monitor product levels without touching the fluid. On drilling rigs, it verifies positions of moving components where mechanical switches would fail. Because the sensor operates from -30 °C to +65 °C, it suits both hot process areas and cold outdoor installations. The IP65 housing resists dust and water jets, while the zinc die-cast body withstands vibration and impact.

For high-temperature applications, SICK offers cooling plates that extend the operating range to +80 °C, or to +140 °C with a protection filter. This scalability lets engineers standardize on one sensor family across diverse process conditions.

Integration and Installation Guidance

The M12 5-pin connector simplifies wiring to PLCs and control systems. The analog 4 mA ... 20 mA output integrates with standard input cards, while the PNP digital output can drive relays or indicators directly. A multifunctional input allows external triggering or parameter switching. The built-in LC display and menu buttons enable quick setup without a PC.

Mount the sensor so the laser beam strikes the target surface at a near-perpendicular angle. Avoid direct sunlight on the receiver and keep the optical window clean. For outdoor installations, use a sunshade or protection filter to prevent overheating. Always follow local electrical codes and the manufacturer's instructions.

Reliability and Maintenance

With no moving parts, This unit minimizes scheduled maintenance. Periodic inspection of the optical window and connector is usually sufficient. In dusty environments, wipe the PMMA window with a soft cloth and mild detergent. Check mounting hardware for tightness after high-vibration events. The rugged zinc die-cast housing resists corrosion in most industrial atmospheres.

Frequently Asked Questions

What is the measuring range of the SICK unit?

This unit measures from 200 mm up to 10,000 mm on 90% remission targets, 6,500 mm on 18% remission, and 4,000 mm on 6% remission.

Can This unit operate in high-temperature areas?

Yes. The standard operating temperature is -30 °C ... +65 °C. With two cooling plates, it extends to +80 °C; with two cooling plates and a protection filter, it reaches +140 °C (Uv ≤ 24 V).

What output signals does This unit provide?

It offers one PNP digital output (≤ 100 mA) and one analog current output (4 mA ... 20 mA, ≤ 300 Ω, 16-bit), plus a multifunctional input.

Is This unit eye-safe?

Yes. The visible red laser is Class 1 per IEC 60825-1:2014 and EN 60825-1:2014, making it eye-safe under normal operating conditions.

How is This unit connected?

It uses a male M12 5-pin connector. Supply voltage is DC 10 V ... 30 V with reverse-polarity protection.

Contact PetroPartsOnline for parts suited to your application's requirements.

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