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DS18B20 IP68 Waterproof Temperature Sensor – Submersible Water Temp Probe 2meter

SKU: FA3052-00
Sensor IC

Maxim DS18B20
Temperature Range

-55°C to +125°C
Accuracy

±0.5°C (-10°C to +85°C)
Resolution

9–12 bits selectable (0.0625°C at 12-bit)
Interface

1-Wire (single data line)
Operating Voltage

3.0V – 5.5V DC
Waterproof Rating

IP68 (submersible in fresh water)
Cable Length / Probe Size

2 meters / ~6mm diameter stainless steel sheath

The DS18B20 IP68 Waterproof Temperature Sensor is a rugged, submersible digital temperature probe designed for accurate temperature measurement in wet, harsh, and outdoor environments. With a 2-meter cable, this probe offers extended reach for larger water tanks, deeper aquaculture systems, outdoor installations, and industrial equipment monitoring where a standard 1-meter cable would be insufficient. The sensor is encapsulated inside a stainless steel sheath filled with sealing compound, delivering reliable IP68-rated performance for continuous submersion in fresh water.

At the heart of the probe is the Maxim DS18B20 digital thermometer, providing 9-bit to 12-bit selectable resolution and a measurement range of -55°C to +125°C. Accuracy is ±0.5°C over the critical -10°C to +85°C range, making it suitable for precise environmental and process control. The 1-Wire interface requires only one data line (plus power and ground) for communication, and each sensor carries a unique 64-bit serial code, allowing multiple probes to share a single microcontroller pin—ideal for distributed temperature sensing across large facilities, multi-zone aquariums, or extensive hydroponic systems.

The IP68-rated stainless steel housing (approximately 6mm diameter) protects the sensor from water ingress, corrosion, and physical damage, making it suitable for continuous submersion in fresh water. The 2-meter PVC-jacketed cable provides flexible placement for deeper or more distant measurement points, with standard wire colors: Red for VCC, Yellow for DATA, and Black for GND. The probe operates from 3.0V to 5.5V, compatible with Arduino, Raspberry Pi, ESP32, STM32, and other microcontrollers.

Important Note: While the probe is IP68 waterproof and suitable for fresh water, it is not intended for salt water or other corrosive liquids. The PVC cable jacket is rated for temperatures up to approximately 100°C; for higher-temperature applications, a probe with a PTFE or silicone cable is recommended. A 4.7kΩ pull-up resistor between the DATA and VCC lines is required for reliable 1-Wire communication—many breakout adapters include this resistor, but verify your setup. For Arduino, the OneWire and DallasTemperature libraries simplify code development.

Whether you are monitoring a large aquarium, automating a multi-zone hydroponic system, or logging data in an outdoor weather station, this 2-meter waterproof DS18B20 probe provides a reliable, well-supported solution for submersible temperature measurement over extended distances.

Features

  • Original Maxim DS18B20 sensor — Digital temperature output with 9–12 bit selectable resolution

  • IP68 waterproof stainless steel probe — Submersible in fresh water; resistant to corrosion and physical damage

  • 2-meter cable — Extended reach for deeper tanks, outdoor installations, and distant measurement points

  • Wide temperature range — -55°C to +125°C with ±0.5°C accuracy from -10°C to +85°C

  • 1-Wire interface — Only one data pin required; multiple sensors share the same bus

  • Unique 64-bit serial code — Each probe is individually addressable for multi-sensor networks

  • 3.0V to 5.5V operation — Compatible with Arduino, Raspberry Pi, ESP32, and STM32

  • Stainless steel sheath (6mm diameter) — Durable and hygienic for water and food-adjacent applications

  • Wide application range — Large aquariums, hydroponics, HVAC, industrial process monitoring, weather stations

  • Library support — OneWire and DallasTemperature libraries for Arduino

Technical Specifications 

# Parameter Specification
1 Sensor IC Maxim DS18B20
2 Temperature Range -55°C to +125°C
3 Accuracy ±0.5°C (-10°C to +85°C)
4 Resolution 9–12 bits selectable (0.0625°C at 12-bit)
5 Interface 1-Wire (single data line)
6 Operating Voltage 3.0V – 5.5V DC
7 Waterproof Rating IP68 (submersible in fresh water)
8 Cable Length / Probe Size 2 meters / ~6mm diameter stainless steel sheath

Usage

Getting Started (Arduino)

  1. Wire the probe — Connect Red (VCC) to 5V (or 3.3V), Black (GND) to GND, and Yellow (DATA) to a digital pin (e.g., D2).

  2. Add a pull-up resistor — If your adapter board does not include one, connect a 4.7kΩ resistor between the DATA line and VCC.

  3. Install libraries — Install OneWire and DallasTemperature through the Arduino Library Manager.

  4. Upload a test sketch — Use the DallasTemperature example to read and display the temperature over Serial.

  5. Submerge the probe — Place the stainless steel tip in the liquid or environment to be measured. Ensure the cable jacket is not submerged beyond its rating if using in high-temperature liquids.

Wire Connections

Wire Color Function
Red VCC (3.0V–5.5V)
Yellow DATA (1-Wire)
Black GND

Example Arduino Code (DallasTemperature)

cpp
#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 2  // Yellow wire to D2

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  Serial.begin(9600);
  sensors.begin();
}

void loop() {
  sensors.requestTemperatures();
  float tempC = sensors.getTempCByIndex(0);

  if (tempC == DEVICE_DISCONNECTED_C) {
    Serial.println("Error: Could not read temperature");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.println(" °C");
  delay(1000);
}

Typical Applications

  • Large aquariums and fish tanks — Continuous water temperature monitoring with extended cable reach

  • Hydroponics and aquaponics — Nutrient solution temperature control across multiple zones

  • Water tanks and reservoirs — Deep tank temperature logging

  • HVAC systems — Duct and pipe temperature measurement

  • Industrial process monitoring — Liquid and equipment temperature sensing at a distance

  • Weather stations — Outdoor ambient temperature logging

  • Homebrewing and fermentation — Temperature control for beer and wine production

Notes for Business Buyers

  • Original DS18B20 chip — Genuine Maxim sensor for reliable digital output and multi-sensor capability

  • IP68 waterproof — Suitable for fresh water submersion; not for salt water or corrosive liquids

  • Extended 2-meter cable — Ideal for deeper or more distant measurement points

  • Suitable for bulk purchasing — Ideal for aquarium product manufacturers, hydroponic system integrators, and industrial monitoring developers

Q: What is the DS18B20 IP68 Waterproof Sensor used for?

It is a submersible digital temperature probe for measuring liquid or ambient temperature in large aquariums, hydroponic systems, water tanks, HVAC, and industrial process monitoring.

Q: Can the bare DS18B20 sensor be submerged in water?

No. The bare TO-92 DS18B20 has no sealed enclosure and cannot be submerged. This product encapsulates the sensor in a stainless steel waterproof housing (IP68) specifically for wet environments.

Q: What is the temperature range and accuracy?

The probe measures from -55°C to +125°C with ±0.5°C accuracy over the critical -10°C to +85°C range.

Q: What are the wire colors and their functions?

Red = VCC (power), Yellow = DATA (1-Wire signal), Black = GND (ground).

Q: Do I need a pull-up resistor?

Yes. A 4.7kΩ resistor is required between the DATA and VCC lines for reliable 1-Wire communication. Some adapter boards include this resistor; verify your setup.

Q: Can I connect multiple probes to one Arduino pin?

Yes. Each DS18B20 has a unique 64-bit serial code, allowing multiple probes to share the same 1-Wire bus. Use the DallasTemperature library to address each sensor individually.

Q: Is this probe suitable for salt water aquariums?

Not recommended. The stainless steel housing is not designed for salt water or corrosive liquids. Use a probe with a suitable corrosion-resistant sheath for marine applications.

Q: What is the maximum cable temperature rating?

The PVC cable jacket is rated for approximately 100°C. For higher-temperature liquids, a probe with PTFE or silicone cable is recommended.

Q: What is the advantage of the 2-meter cable?

The extended cable allows measurement in deeper tanks, outdoor installations, and distant equipment where a 1-meter cable would not reach.

Q: Can I purchase in bulk for a product development project?

Yes. This probe is suitable for bulk purchasing by aquarium product manufacturers, hydroponic system integrators, and industrial monitoring developers.

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