Combination Sensor for Temperature and Humidity

Precise climate monitoring in a CAN bus network

The Didactum humidity and temperature CAN sensor is a high-quality humidity and temperature sensor with an attractive price-performance ratio. By connecting multiple humidity and temperature sensors in a CAN daisy chain, temperature and humidity values can be measured at any location in a room or server cabinet.

Each environmental parameter of the sensor is displayed as a separate element in the Didactum web interface. This makes it possible to define individual threshold values and trigger events such as notifications or other actions. A key feature is the automatic calculation of the dew point based on the captured temperature and humidity values - essential for avoiding condensation problems in sensitive areas such as data centers, production facilities, or warehouses.

As a robust CAN bus environmental sensor, the sensor supports daisy chaining with other CAN devices. Depending on the system configuration, 10 to 32 CAN units can be connected in a single CAN bus chain, which enables high scalability.

Sensor structure at a glance

The sensor has four key elements that are relevant for installation, wiring, and status checks.

Setting the TR switch correctly

The TR switch ensures proper termination of the CAN bus chain and must be set differently depending on the sensor's position within the chain.

• Single sensor: If only one CAN sensor is connected to the main module, that sensor is also the only and last device in the chain. The TR switch must be set to "ON" (down).
• Sensor in the middle of the chain: If multiple sensors or modules are connected via the CAN bus and the sensor is not at the end of the chain, the TR switch must be set to "OFF" (up).
• Last sensor in the chain: If the sensor is at the end of a chain made up of multiple devices, the TR switch must be set to "ON" (down).

Measurement accuracy and operating temperature range

For this sensor, it is important to distinguish between the range of guaranteed measurement accuracy and the much wider operating temperature range of the housing.

The sensor itself is designed for use in a very wide temperature and humidity range (−40 °C to +100 °C, 0 to 95% RH). The stated measurement accuracy of ±0.4 °C and ±3% RH applies to the narrower range of −10 °C to 85 °C and 0–80% RH, where values are captured with maximum precision.

Sensor applications

The Didactum humidity and temperature CAN sensor serves as an industrial CAN climate sensor and is suitable for numerous applications.

• Telecommunications stations: Continuous monitoring at remote sites prevents device failures due to overheating or moisture
• Energy facilities: Precise environmental monitoring in power plants contributes to operational safety and efficiency
• Cheese storage: Exact humidity and temperature conditions ensure product quality through real-time data and alarms
• Greenhouses: Monitoring air temperature and relative humidity supports automated climate control systems
• Data centers: Monitoring critical parameters prevents outages by maintaining safe operating conditions
• Industrial facilities: Early detection of anomalies minimizes the risk of downtime in production systems
• Warehouses: Protect goods from moisture damage or mold growth through controlled environmental conditions
• Pharmaceutical storage: Precise climate control to comply with storage requirements for medicines and vaccines

Functions in the web interface

Connecting CAN sensors

Up to 32 CAN units can be connected in a CAN bus chain, making the Didactum system highly modular. Each connected CAN sensor expansion unit provides additional analog ports, while CAN dry-contact expansions provide additional floating contact inputs. Whether you use just a single sensor or a complex network of multiple CAN bus sensors and other CAN devices, the system adapts flexibly to your requirements.

An additional CAN power supply (12V/1A) is only required when the number of CAN devices in the chain exceeds 12.

What is included in the box

Please check the contents for completeness upon receipt and report any missing or damaged parts to your supplier immediately. In the event of transport damage, please contact the responsible delivery service directly.

• Humidity and temperature CAN sensor1 piece
• RJ11-6P4C cable, 2 m1 piece
• Screws M3.5 x 10 mm2 pieces
• Screws B3.5 x 13.5 mm2 pieces
• Nuts M3.52 pieces
• Washers M3.52 pieces
• Self-adhesive labels2 pieces

Why this sensor is the right choice

Frequently asked questions