Equipped with enclosed waterproof probe for reliable performance
Detects range from 27cm to 800cm with high accuracy
Offers both RS232 and voltage analog output modes
Provides high-precision temperature output and compensation
Features low power consumption and wide power supply range
The DFRobot Waterproof Ultrasonic Distance Sensor (27~800Cm, ULA) is a high-performance device equipped with an enclosed waterproof probe. Utilizing the principle of ultrasonic echo ranging, it determines the distance to a target by measuring the time lapse between the emission of a pulse and the reception of its echo, all without physical contact. This sensor is versatile, capable of detecting transparent or non-ferrous objects, as well as metallic and non-metallic objects, liquids, solids, and powders. Its unique bell-mouth shell design significantly enhances the directivity and stability of the ultrasonic output.
The sensor offers two output modes: RS232 and voltage analog output, with RS232 being the default setting. This mode can be altered via a button on the device.
Note: The internal probe surface is the default starting point for detection. If the plane of the bell-mouth is used as the starting point, the detected distance will be reduced by 40mm.
1x Water-proof Ultrasonic Sensor (ULA)
1x Screw bag
1x Connector
High degree of protection
Wide power supply range with low power consumption
High measuring accuracy and resolution
High-precision temperature output with temperature compensation function
Compatible outputs: standard RS232 and voltage analog
Supply voltage range: 5V to 12V
Center frequency: 40kHz
Average operating current: less than 10mA (5V supply; 250ms duty cycle)
Blind zone: 270mm
RS232 mode detection distance: up to 8000mm beyond blind zone
Analog mode detection distance: calculable through programming with a 3.3V output voltage
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
This return policy also applies, as a minimum standard, to products sold and fulfilled by third-party vendors through the Marketplace.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at the Vendor's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
A valid Return Authorization (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
The RA number is valid for 30 days. The returned item must be received within that period.
The RA number must be included with the return.
Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RobotShop's troubleshooting process or of a verified shipping error by RobotShop.
Refunds are processed within 7 days after receipt and inspection of the returned item.
A $100 cleaning fee may apply to domestic robots returned in used or unclean condition.
A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RobotShop's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
Consumables — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tires, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odor-absorbing products). Not eligible for return once unsealed.
Build-it-yourself products and items requiring customer assembly — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
Digital Goods, Software, and Apps — Final sale only, due to licensing restrictions.
Clearance Items — Products identified as clearance or final sale, including end-of-life or discontinued items.
Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
On-Demand Items — Standard catalogue products not stocked by RobotShop and ordered specifically to fulfill a customer request.
While the same return policy applies, these orders require a separate contact process for returns.
RobotShop Fulfilled Orders → submit a support ticket from your account under My Support Tickets.
Marketplace Vendor Orders → submit a ticket from your account under My Marketplace Tickets to contact the vendor directly.
Note: Marketplace vendor products are normally labelled with SKUs starting with RM, and identified on the product page with the mention "Sold and fulfilled by [Vendor Name]".
