Sensors for Agricultural Climate Control

Agrovent manufactures sensors for agricultural climate systems. Explore sensor placement, controller integration, commissioning and maintenance for your site.

Measurement · Control · Operational insight

Good climate control starts with representative measurements

A controller can only respond to the conditions its sensors detect. A precise probe in the wrong location may give a convincing reading while missing the warmest crop zone, a local humidity problem or an ineffective ventilation cycle.

Agrovent manufactures sensors for agricultural applications and integrates measurement into climate-control systems. We define what to measure, where to measure it and how the reading will be used. The sensor configuration, range, protection and interface are confirmed for the selected model and the actual controller.

Discuss sensor selection

Temperature: separate air conditions from product conditions

Room air, supply air and stored product temperatures answer different questions. A room sensor describes its surrounding air; a correctly installed product probe helps track the crop's thermal response. Their readings should not be treated as interchangeable.

For vegetable storage, define reference locations for the crop, return air, conditioned supply air and outdoor air where relevant to the control strategy. Use several locations when the room geometry or loading creates distinct zones.

Protect representative air sensors from direct sun, radiant heat, cold surfaces and accidental contact with produce. A supply-air probe belongs in the intended air stream; a room reference probe should not be dominated by that same jet.

RTD probes and digital transmitters are common options. Check the sensor characteristic, wiring configuration and controller input before replacing an existing device.

Agrovent sensor among stored onions
Agrovent sensor in onion storage. Image adapted from the photograph on this product page.
Illustrative placement of an Agrovent sensor in an air preparation area
Illustration of an Agrovent sensor in an air preparation area, based on the product photograph. Final mounting depends on the measurement task.

Humidity: interpret the reading with temperature

Relative humidity changes with temperature, even when the amount of moisture in the air has not changed. Comparing humidity readings from different zones therefore requires the local temperature as well.

In storage rooms, humidity monitoring supports decisions about crop moisture loss and condensation risk. In production buildings it helps assess moisture removal and the operation of ventilation or humidification equipment.

Keep representative probes away from direct mist and droplets. Saturation, contamination and a wet filter can slow the response or make readings unreliable. Choose protection for the actual dust, moisture and cleaning conditions, while allowing adequate air exchange around the sensing element.

Dew point is useful when evaluating condensation, but surface temperature must also be considered. Room RH alone cannot confirm whether a particular wall or crop surface will become wet.

CO2: measure the gas that the ventilation strategy must manage

CO2 monitoring adds information that temperature and humidity cannot provide. In storage it can support a ventilation review; in livestock buildings it contributes to understanding air exchange. Interpretation depends on occupancy or crop loading and the operating stage.

CO2 monitoring requires a dedicated instrument, specified separately from a temperature probe. Select an actual CO2 measurement technology and a range suitable for the expected conditions. A generic air-quality index or estimated CO2 value is not a substitute for a direct CO2 measurement.

Plan the sampling location around the space and airflow. Avoid a convenient but unrepresentative position beside a fresh-air opening. If sampling tubes are used, account for transport delay, condensation and maintenance.

Explore the CO2 removal system. Control thresholds and operating sequences must be agreed for the application. Process monitoring does not replace a separately specified personnel safety alarm system.

Illustrative Agrovent sensor integration in a crop storage monitoring system
Illustration of an Agrovent sensor connected within a storage monitoring system. CO2 measurement requires a dedicated, appropriately specified sensing device.
Illustrative inspection of an Agrovent sensor by a technician
Illustration of a technician inspecting an Agrovent sensor. Differential-pressure measurement requires a separate suitable transmitter and pressure connections.

Differential pressure: check how the ventilation system is working

A dedicated differential-pressure transmitter is required for this measurement task. Pressure difference can help evaluate room depressurisation, inlet operation or filter condition, depending on where the pressure taps are connected. These are different measurement tasks and may require different ranges and installation details.

Choose a range that resolves the intended operating pressure without being dominated by full-scale uncertainty. Check polarity, zero offset and tubing condition during commissioning.

Blocked or leaking tubes can mislead a controller even when the electronic transmitter is functioning. Locate pressure taps to avoid unwanted velocity effects and provide access for inspection.

A pressure signal alone is not an airflow measurement unless the associated arrangement and relationship have been established. Relate it to the ventilation equipment and, where applicable, controlled air inlets.

Specify the complete measurement chain

Accuracy and response

Resolution is the smallest displayed increment; accuracy describes closeness to the measured value under stated conditions. Extra decimal places do not establish better accuracy.

Review sensor uncertainty, transmitter and input errors, drift, response time and installation effects. A calibration result for the probe does not validate the entire control loop.

Environment and service

Specify operating temperature, condensation exposure, dust, chemical cleaning and mechanical protection. An enclosure rating is not a blanket guarantee for a wet sensing element or aggressive washdown.

Include accessible mounting, replaceable protection where applicable and a practical inspection procedure.

Signal and controller

Match the exact input type: resistance sensor, voltage, current loop or digital communications. For digital devices, confirm protocol, register map, scaling, supply and addressing.

RS-485 describes an electrical interface; it does not alone establish compatible data exchange.

Review the inputs with Agrovent climate controllers and the electrical integration with power control and automation panels.

Commissioning turns a reading into usable information

  1. Record the installation: device model, location, height or insertion depth, input channel, range and engineering units.
  2. Check the complete path: compare a suitable reference with the local reading and the value received by the controller. Allow the reference and sensor to stabilise under comparable conditions.
  3. Verify faults: check the configured response to a disconnected probe, missing communication and out-of-range data using an agreed commissioning procedure.
  4. Observe operating cycles: review behaviour during ventilation, cooling, defrost or humidification as relevant. Investigate suspicious flat lines or abrupt changes.
  5. Plan maintenance: define cleaning, inspection and verification intervals according to exposure, manufacturer guidance and the importance of the measurement.

Do not correct every unexpected reading with an offset. First check location, contamination, wiring, scaling and the reference method. An offset can conceal a fault rather than resolve it.

Connect measurements to better operating decisions

Temperature, humidity, CO2 and pressure become more useful when their timestamps can be compared with equipment states and production observations. Reliable location labels and visible data gaps are essential when combining records.

Our farm monitoring and climate intelligence page explains how to scope that work. Agilias provides the related technology context; compatibility and analytical deliverables are assessed for each project.

In poultry buildings, sensor readings can also be reviewed alongside video observations of flock behaviour. Neither a sensor nor an analytical model removes the need for an on-site investigation when the evidence is incomplete.

Sensor selection questions

How many sensors does a room need?

The number depends on the measurement purpose, room size, loading arrangement and airflow. Identify distinct zones and the control reference first; do not use a universal sensor-per-area rule without checking the layout.

Can I replace a probe with one that has the same connector?

Only after confirming the sensing element or output, pin assignment, supply, range, scaling and controller compatibility. A matching connector does not establish compatibility.

Can one combined sensor do everything?

A combined device may simplify installation, but the best position for one measurement may be unsuitable for another. Product temperature, supply-air temperature and room humidity often require separate locations.

Does every Agrovent sensor measure all four parameters?

No. This page explains different measurement tasks within an agricultural climate system. The actual Agrovent sensor configuration and the need for additional specialist instruments are confirmed by the selected model and project specification.

Send us the measurement task

Tell us the building type, required measurements, operating conditions and existing controller model. A layout, current sensor list and description of any unreliable readings help define a suitable configuration.

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