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Industrial Grade DS18B20 Waterproof Temperature Sensor for Liquid/Water Monitoring (G1/2″ Thread Probe DIA=7mm)

SKU: FA3052-1
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
Thread / Probe Diameter

G1/2″ external thread / ~7mm stainless steel sheath
Waterproof Rating

IP68 (submersible in fresh water)

The Industrial Grade DS18B20 Waterproof Temperature Sensor is a rugged, thread-mounted digital temperature probe engineered for continuous liquid and water monitoring in demanding environments. Unlike standard cable probes, this version features a G1/2″ (1/2-inch BSP) external thread on the stainless steel sheath, allowing it to be screwed directly into pipes, tanks, boilers, and industrial equipment for a secure, leak-resistant installation. The 7mm probe diameter provides a robust physical profile while maintaining fast thermal response.

At the heart of the probe is the Maxim DS18B20 digital thermometer, the industry standard for reliable 1-Wire temperature sensing. It delivers 9-bit to 12-bit selectable resolution (0.0625°C at 12-bit) and a measurement range of -55°C to +125°C, with ±0.5°C accuracy over the critical -10°C to +85°C range. The 1-Wire interface requires only one data line (plus power and ground), and each sensor carries a unique 64-bit serial code, enabling multiple probes to share a single microcontroller pin for distributed monitoring across large systems.

The stainless steel housing protects the sensor from water ingress and corrosion, making it suitable for continuous submersion in fresh water, HVAC loops, and process fluids. The G1/2″ thread is a widely used standard in plumbing and industrial piping, ensuring compatibility with common fittings, tees, and weld-on bungs. The probe operates from 3.0V to 5.5V, compatible with Arduino, Raspberry Pi, ESP32, STM32, and industrial controllers.

Important Note: This probe is designed for liquid and water monitoring in non-corrosive media. While the stainless steel housing is waterproof, verify chemical compatibility for aggressive fluids or salt water. A 4.7kΩ pull-up resistor between the DATA and VCC lines is required for reliable 1-Wire communication. For Arduino, the OneWire and DallasTemperature libraries simplify code development. Ensure the thread is sealed with appropriate pipe tape or sealant during installation to prevent leaks.

Whether you are monitoring boiler temperature, automating a water treatment system, or logging data in an industrial process line, this G1/2″ threaded DS18B20 probe provides a durable, installation-ready solution for precise digital temperature measurement.

Features

  • G1/2″ threaded stainless steel probe — Screws directly into pipes, tanks, and equipment for secure, leak-resistant installation

  • 7mm probe diameter — Robust physical profile with fast thermal response

  • Original Maxim DS18B20 sensor — Digital 1-Wire output with 9–12 bit selectable resolution

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

  • Unique 64-bit serial code — Multiple probes share one bus for distributed monitoring

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

  • Waterproof stainless steel housing — Suitable for continuous liquid immersion

  • Standard industrial thread — G1/2″ compatibility with common fittings and bungs

  • Wide application range — Boilers, HVAC, water treatment, process monitoring, industrial equipment

  • 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 Thread / Probe Diameter G1/2″ external thread / ~7mm stainless steel sheath
8 Waterproof Rating IP68 (submersible in fresh water)

Usage

Getting Started (Arduino)

  1. Install the probe — Screw the G1/2″ thread into a compatible fitting or bung in your pipe or tank. Apply PTFE tape or sealant to the threads for a watertight seal.

  2. 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).

  3. Add a pull-up resistor — Connect a 4.7kΩ resistor between the DATA line and VCC if not already present in your adapter.

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

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

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

  • Boiler and water heater monitoring — Threaded installation in heating loops and tanks

  • HVAC systems — Chilled water and hot water pipe temperature measurement

  • Industrial process control — Fluid temperature monitoring in process lines

  • Water treatment systems — Tank and pipeline temperature logging

  • Building automation — District heating and cooling system monitoring

  • Solar thermal systems — Collector and storage tank temperature sensing

Notes for Business Buyers

  • Installation-ready — G1/2″ thread simplifies integration into existing piping and tank systems

  • Industrial durability — Stainless steel housing and threaded mounting for demanding environments

  • Multi-sensor capability — Unique 64-bit addresses allow multiple probes on one bus

  • Suitable for bulk purchasing — Ideal for HVAC integrators, boiler manufacturers, and industrial process control developers

Q: What is the G1/2″ threaded DS18B20 probe used for?

It is a thread-mounted digital temperature probe for liquid and water monitoring in pipes, tanks, boilers, and industrial equipment, offering secure installation and reliable 1-Wire digital output.

Q: What is the thread size and probe diameter?

The probe features a G1/2″ (1/2-inch BSP) external thread and a 7mm diameter stainless steel sheath.

Q: How do I install the probe in a pipe or tank?

Screw the G1/2″ thread into a compatible fitting, tee, or weld-on bung. Apply PTFE tape or appropriate sealant to the threads to ensure a watertight seal.

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.

Q: Can I connect multiple threaded 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 or corrosive fluids?

Not recommended for salt water or aggressive chemicals. The standard stainless steel housing is designed for fresh water and non-corrosive media. Verify chemical compatibility for your specific application.

Q: What is the operating voltage?

The probe operates from 3.0V to 5.5V DC, compatible with Arduino, Raspberry Pi, ESP32, and STM32.

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

Yes. This threaded probe is suitable for bulk purchasing by HVAC integrators, boiler manufacturers, and industrial process control developers.

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