SensMax SensGuard DS18B20 Wireless Temperature Sensor with Probe

The SensGuard DS18B20 wireless temperature sensor with probe is designed for remote temperature monitoring in refrigeration, cold storage, HVAC systems, machinery, ventilation ducts, liquid containers and other hard-to-reach measurement points.

The sensor uses an external DS18B20 digital probe to measure temperatures from -30°C to +120°C. The 1 m stainless steel probe can be placed inside a freezer, cold room, duct, equipment housing or liquid container, while the wireless sensor body remains mounted outside the monitored zone.

Readings are measured every 5 minutes and sent wirelessly to a compatible SensGuard gateway, such as SensGuard TCP LR X2. The gateway forwards data to the SensGuard cloud monitoring platform, where users can view reports, monitor trends and receive alerts when temperature limits are exceeded.

SensGuard DS18B20 sends probe temperature readings wirelessly to a SensGuard gateway and cloud monitoring portal.

At a Glance

• Wireless temperature sensor with external DS18B20 digital probe.
• Probe measurement range from -30°C to +120°C.
• ±0.5°C measurement accuracy across the full measurement range.
• 0.1°C measurement resolution for temperature trend monitoring.
• 1 m stainless steel probe cable for freezers, ducts, equipment and liquid containers.
• Wireless 868 MHz communication to a compatible SensGuard gateway.
• Up to 150 m communication range in clear line-of-sight conditions.
• AES-128 encrypted data transmission between sensor and gateway.
• Battery-powered operation with two replaceable AAA batteries.
• Battery life up to 5 years at the default measurement interval.
• IP54 enclosure for the sensor body.

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How the DS18B20 Sensor Works

The DS18B20 sensor measures temperature through an external stainless steel digital probe. The probe is placed in the required measurement area, while the wireless sensor body can stay outside the freezer, duct, tank, machine housing or monitored equipment area.

Every 5 minutes, the sensor records a temperature reading and sends it over an AES-128 encrypted 868 MHz radio channel to a compatible SensGuard gateway. The gateway then sends the data to the SensGuard cloud platform for reporting, alerts and historical analysis.

The device includes a network diagnostic button and status LED, so users can check whether the sensor is connected to the gateway and cloud system.

Probe Temperature Monitoring

The external probe makes the DS18B20 suitable for locations where the temperature must be measured inside a specific area, but the sensor body should remain outside for wireless communication and battery access.

Typical examples include refrigerated cabinets, walk-in freezers, ventilation ducts, liquid containers, machinery and technical equipment. The probe measures the target area, while the sensor body remains easier to service and within normal electronics operating conditions.

Installation

The sensor body is mounted using high-bond double-sided adhesive tape on a smooth surface such as plastic, metal, glass or a painted wall. This allows quick installation without drilling or additional mounting hardware.

After mounting the sensor body, place the external 1 m probe in the area where temperature must be measured. The sensor body should be positioned where it remains within wireless range of the SensGuard gateway and within the allowed operating temperature range for the electronics.

The sensor is shipped powered off to protect the batteries during storage and transport. To start operation, press and release the JOIN button and register the sensor in the SensGuard cloud portal using the connection wizard.

DS18B20 probe monitoring for refrigeration, HVAC ducts, liquid containers, equipment and cold storage.

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Compatible Gateway and Cloud Monitoring

The DS18B20 sensor requires a compatible SensGuard gateway for online monitoring. The gateway receives wireless readings from the sensor and forwards them to the SensGuard cloud platform.

• SensGuard TCP LR X2 wireless gateway and data collector for SensGuard monitoring sensors.

In the cloud platform, users can review temperature history, configure thresholds, receive alerts and export monitoring reports. This supports daily supervision, quality control and audit documentation.

Typical Applications

SensGuard DS18B20 is suitable for wireless temperature monitoring where a practical external probe is needed for refrigeration, ducts, liquid containers or equipment areas.

• Commercial refrigeration for supermarkets, grocery stores, display cases and walk-in freezers.
• Cold storage and warehousing for cold rooms, frozen goods, food storage and temperature-sensitive inventory.
• Pharmaceutical storage for refrigerators, cabinets and storage rooms where temperature history must be tracked.
• HVAC and ventilation for air duct temperature monitoring and technical-area supervision.
• Industrial equipment for machinery, process pipelines and production environments.
• Liquid containers for water, beverage, chemical or process temperature monitoring.
• Server rooms and data centers for localized monitoring around racks and equipment.
• Museums and archives for climate-sensitive exhibits and storage areas.

Business Benefits

Wireless probe temperature monitoring helps organizations reduce manual checks and detect temperature changes before they cause product loss, service interruptions or quality problems. The external probe allows temperature measurement in the exact required point, while the sensor body remains accessible for service.

Cloud reporting and alerts help teams react faster, maintain temperature history and support internal quality control. The wireless design also makes it easier to add monitoring points in existing facilities without running long signal cables to each measurement point.

• monitor probe temperatures from -30°C to +120°C;
• reduce manual temperature checks;
• receive alerts when thresholds are exceeded;
• keep historical reports for quality control and audit needs;
• place the probe in the monitored zone while keeping the sensor body accessible;
• add new monitoring points without running sensor cables to the gateway.

Example in Action

A pharmaceutical warehouse installs SensGuard DS18B20 temperature sensors with probes in refrigerators and freezer units. The probes are placed inside the monitored equipment, while the wireless sensor bodies remain mounted outside for better communication and easier battery replacement.

The monitoring platform tracks temperature history and sends alerts when readings approach unsafe limits. Staff can react before medicines or stored goods are affected, while the reports support internal quality control and compliance documentation.

Technical Details

FAQ SensGuard DS18B20 Sensor

• What is the measurement range of the DS18B20 sensor?
  The external probe measures temperatures from -30°C to +120°C.
• What is the measurement accuracy?
  The measurement accuracy is ±0.5°C across the full range.
• How long is the probe cable?
  The standard probe cable length is 1 m. Longer options are available upon request.
• Can the sensor body be placed inside a freezer or hot area?
  The external probe is designed for the measured zone, but the sensor body operating temperature is -20°C to +55°C. The sensor body should be installed within this allowed range.
• Which gateway is required?
  The sensor requires a compatible SensGuard gateway, such as SensGuard TCP LR X2.
• How often are measurements sent?
  The measurement interval is 5 minutes.
• What batteries does the sensor use?
  The sensor uses two AAA 1.5V batteries. Lithium batteries are recommended for sub-zero temperatures.
• How long does the battery last?
  Battery life is up to 5 years at the default measurement interval.
• How is the sensor mounted?
  The sensor body is mounted using high-bond double-sided adhesive tape on a smooth surface.

Ready to Get Started?

Need wireless temperature monitoring with an external probe for refrigeration, freezers, HVAC ducts, liquid containers, machinery or storage areas? SensMax can help you choose the right DS18B20 sensor and SensGuard gateway configuration for your project.

Share your temperature range, probe location, number of monitoring points, distance to the gateway and reporting requirements, and we will help define the correct setup.

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