BMT DS18B20 Waterproof Temperature Probe Stainless Steel 2m

The BMT DS18B20 Temperature Probe is a waterproof digital temperature sensor designed for accurate temperature monitoring across a wide operating range of -55 C to +125 C. The sensing element is housed inside a stainless steel tube, providing a practical and durable solution for applications where the sensor may be exposed to moisture or demanding environments.

The probe features a 2 metre cable and uses the DS18B20 1-Wire digital interface, allowing communication with a compatible microcontroller using only one digital data pin. Multiple DS18B20 sensors can also share the same data line, with each sensor identified by its unique 64-bit identification code.

With selectable 9 to 12-bit resolution and stated accuracy of 0.5 C from -10 C to +85 C, this probe is suitable for a wide range of electronics, automation, monitoring and DIY temperature-sensing applications.

Key Features

• DS18B20 digital temperature sensor
• Waterproof stainless steel probe design
• -55 C to +125 C usable temperature range
• 0.5 C accuracy from -10 C to +85 C
• Selectable 9 to 12-bit resolution
• Uses a simple 1-Wire digital interface
• Requires only one digital pin for data communication
• Multiple sensors can share one data line
• Unique 64-bit sensor ID
• Built-in temperature-limit alarm capability
• Query time of less than 750ms
• 2 metre cable
• 6mm diameter stainless steel probe
• 35mm stainless steel probe length
• Suitable for compatible 3.0V to 5.5V systems

Technical Specifications

• Product Type: Waterproof Temperature Probe
• Sensor: DS18B20
• Interface: 1-Wire
• Operating Power/Data Voltage: 3.0V to 5.5V
• Temperature Range: -55 C to +125 C
• Accuracy: 0.5 C from -10 C to +85 C
• Resolution: 9 to 12-bit selectable
• Unique ID: 64-bit
• Query Time: Less than 750ms
• Probe Material: Stainless Steel
• Probe Diameter: 6mm
• Probe Length: 35mm
• Cable Diameter: 4mm
• Cable Length: 2m
• Number of Wires: 3

1-Wire Digital Interface

The DS18B20 uses a 1-Wire communication interface, allowing temperature data to be transmitted digitally using a single data line.

This simplifies wiring compared with many analogue temperature sensors and makes the probe convenient for microcontroller-based projects.

The three wires are:

• Red: VCC
• Black: GND
• Yellow: DATA

Always verify the wiring before applying power.

Wide Temperature Range

The probe has a specified usable temperature range of:

-55 C to +125 C

This wide range makes the sensor suitable for monitoring temperatures in a variety of indoor, outdoor, equipment-monitoring and automation applications.

The specified 0.5 C accuracy applies within the -10 C to +85 C range.

Selectable Resolution

The DS18B20 supports selectable measurement resolution from 9-bit through 12-bit.

Higher resolution can provide finer temperature measurement, while lower resolution can reduce conversion time. The maximum conversion/query time specified for the sensor is less than 750ms.

Unique 64-Bit Identification

Each DS18B20 sensor has a unique 64-bit identification code stored within the device.

This allows multiple DS18B20 sensors to be connected to the same 1-Wire data line while still allowing the controller to identify individual sensors.

This feature is particularly useful for projects requiring temperature monitoring at multiple locations.

Temperature-Limit Alarm

The DS18B20 includes a temperature-limit alarm function that can be used by compatible control software or systems to identify when a configured temperature threshold has been reached.

This can be useful for temperature monitoring and automation applications where the controller needs to respond to specified temperature limits.

Stainless Steel Waterproof Probe

The sensing element is enclosed in a 6mm diameter stainless steel tube measuring approximately 35mm long.

The stainless steel probe provides a compact and durable housing for the temperature sensor and is suitable for applications requiring a probe-style temperature sensor.

The waterproof construction makes it suitable for compatible environments where exposure to moisture is expected.

2 Metre Cable

The probe is supplied with a 2 metre cable, allowing the sensing point to be positioned away from the controller or electronics.

The cable has an approximate 4mm diameter, providing a practical cable length for equipment monitoring, enclosures and remote temperature measurements.

Applications

The BMT DS18B20 Waterproof Temperature Probe can be used for:

• Arduino temperature projects
• Raspberry Pi projects
• ESP32 and microcontroller projects
• Home automation
• Environmental monitoring
• Equipment temperature monitoring
• Water temperature monitoring
• Aquarium projects
• HVAC monitoring
• Refrigeration monitoring
• Heating systems
• Industrial monitoring
• DIY electronics
• Multi-point temperature monitoring

Typical Connection

A typical connection uses:

Red VCC

Black GND

Yellow Digital DATA Pin

The sensor can be connected to a compatible microcontroller or development board capable of communicating using the DS18B20 1-Wire protocol.

Multiple Sensor Applications

Multiple DS18B20 probes can share a single 1-Wire data line. Their individual 64-bit identification numbers allow compatible software to distinguish between the connected sensors.

This can be useful for monitoring different temperature locations with a single controller.

Important Notes

• Requires a compatible 3.0V to 5.5V power/data environment.
• Red = VCC, Black = GND, Yellow = DATA.
• Verify the wiring and supply voltage before connecting.
• The stated 0.5 C accuracy applies from -10 C to +85 C.
• The usable temperature range is -55 C to +125 C.
• Ensure the probe is installed appropriately for the intended environment.
• The product is a sensor probe and does not include a microcontroller, display or temperature-monitoring system.

What's in the box
1 x BMT DS18B20 Waterproof Stainless Steel Temperature Probe
1 x 2m 3-Wire Cable