Agricultural weather sensor in field

Electronics & IoT Application

Weather & agricultural sensor humidity protection IP65+

An agricultural weather sensor deployed on a 5-10 year battery in open fields — an asset that will never be opened again during its service life. Each factory silica gel pack is saturated within 6-12 months and internal humidity drift propagates silently, until it falsifies data driving your irrigation, phytosanitary, or agricultural forecasting strategy.

The AS-B sticker protects internal air of professional weather stations (Davis Vantage, Renke, Lufft), pro ag sensors (Pessl METOS, Sencrop, Sensoterra, Sentek), leaf wetness sensors, greenhouse hygrometers, water level/hydrology sensors (OTT Hydromet, Vaisala WXT), LoRaWAN/Sigfox/NB-IoT weather network stations, and low-power industrial IoT sensors IP65+. Capillary adsorption above 60% RH, spontaneous regeneration. Compatible with 5-10 year battery energy budgets.

8× usable capacity vs silica gel 0 W — LoRaWAN battery autonomy preserved Compatible IP65/IP66/IP67, IK10 Lab IP66 validated 30°C → 0°C
Request free samples Quote AS-B Request information

Smart agriculture specifics

A 5-10 year deployed asset that's never reopened

Structural point differentiating smart agriculture from other IoT verticals: a battery-powered agricultural sensor is designed for 5-10 years of autonomy without intervention. Field disassembly is rare (often only on hard failure) and costly (dispersed parcels, difficult access, limited agricultural operational window).

The factory silica gel pack is saturated in 6-12 months — the remaining 8-9 years proceed with a non-functional desiccant.

Three technical consequences on agricultural data

1. Precision drift on humidity probes (air and soil)

Leaf wetness sensors, T+RH air probes, soil moisture probes (Sensoterra, Sentek, Hortikult, Pessl METOS) measure ambient air or direct contact medium. When the communication housing's internal air drifts, high-frequency leakage currents on the board modify measurement transmission — result: transmitted digital values not matching real sensor measurement, with no farmer-side detection possible.

2. LoRaWAN/Sigfox/NB-IoT transmission losses at critical hours

The LoRa or cellular radio module is sensitive to internal humidity on high-frequency RF components. Humidity drift degrades link budget and increases frame retry rate — directly reducing battery lifetime and creating measurement gaps unacceptable on critical data (controlled irrigation, frost alerts, sanitary forecasting).

3. Accelerated lithium battery pack aging

Outdoor IoT sensor lithium batteries (LiSOCl2, Li-Mn) are sensitive to internal humidity on power contacts. Progressive corrosion increases internal resistance, degrades available capacity, and shortens 5-10 year announced autonomy to 3-5 real years — doubling physical replacement frequency in field.

Operational cost

Operational cost on a sensor fleet

5-10 yrs

typical battery autonomy claimed

Often reduced to 3-5 years in real conditions without protection

$110-550

per field service intervention

Direct cost + data loss + dispersed parcel access

Data gaps

unquantifiable but critical

On irrigation pilot data, frost alerts, sanitary forecasts

3,600+

cumulative thermal cycles

Over 5-10 years with daily critical morning dew

On a fleet of 1,000 deployed agricultural IoT sensors:

  • Humidity-related failures (connector corrosion, RF modem degradation): 3-8% per year = 30-80 sensors/year to replace = $3,300-44,000 OPEX/year
  • Doubled battery replacement frequency: maintenance OPEX × 2 over 5 years
  • Farmer experience degradation: NPS and churn impacted on associated SaaS

Scope

Concerned verticals and sensor types

Soil and plant sensors

  • Soil moisture probes (Sensoterra, Sentek Drill & Drop, AquaSpy, Hortikult)
  • Multi-depth soil temperature sensors
  • Leaf wetness sensors (sanitary alerts)
  • Sap / plant water flow sensors

Agricultural weather stations

  • Compact agricultural weather stations (Pessl METOS, Davis Vantage Pro, Adcon, Watchdog)
  • Outdoor anemometers and weathervanes
  • Connected rain gauges LoRaWAN/Sigfox
  • Agricultural pyranometers (solar radiation)
  • Frost and morning dew sensors (viticulture, arboriculture)

Livestock and farm operations

  • Livestock building T/RH sensors
  • Feed silo level sensors (LoRaWAN, Sigfox)
  • Water tank / reservoir level sensors
  • Livestock activity sensors (connected outdoor collars)

Operational weather networks & greenhouses

  • National weather network stations (partner networks, MeteoBlue, MétéoSuisse, DWD)
  • Municipal stations
  • Forestry / nature reserves stations
  • Greenhouse hygrometers, CO2 sensors, PAR sensors
  • Hydrocarbon tank level sensors, hydrological sensors

State of the art

Why current solutions don't work

Integrated silica gel pack

  • Saturated in 6-12 months — not adapted to a 5-10 year deployed sensor
  • Field disassembly rarely performed = pack never replaced
  • Field intervention cost > cost of a new sensor after 6-7 years

→ AS-B addresses this central pain point: passive protection over the full lifetime.

Pressure equalization vent

Doesn't control internal humidity (water vapor passes). On agricultural cycle with morning dew, breather alone = sensor that condenses at every morning startup.

→ Complementary to AS-B.

Integrated heating element

  • Drastically reduces autonomy = downgrade from 5-10 years to 1-2 years
  • Unacceptable on a product positioned for long autonomy

→ AS-B advantageously replaces, without battery autonomy impact.

See full comparison of 5 solutions →

Choose your format

Which AS-B format for your sensor type

Sensor typeInternal volumeAS-B format
Compact soil moisture probe0.1-0.3 LAS-B/XS (5 cm²)
Leaf wetness sensor0.1-0.3 LAS-B/XS
Tank / silo level sensor0.3-1 LAS-B/S (10 cm²)
Connected rain gauge0.2-0.5 LAS-B/XS or AS-B/S
Compact agricultural weather station0.5-2 LAS-B/S
Greenhouse multi-parameter T/RH/CO20.3-1 LAS-B/S
Livestock activity sensor (collar)0.1-0.3 LAS-B/XS
Operational network weather station1-5 LAS-B/M or AS-B/L
Outdoor LoRaWAN concentrator1-3 LAS-B/M
AS-B calculator →

Animation

Silica gel vs SRD: adsorption isotherms under humidity cycling

Observe how the compared materials behave over a single cycle, then across time.

0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 Relative humidity (%) Water adsorbed (mL/g) Cap 0.4 mL/g Silica accumulated: 0.00 mL/g SRD current load: 0.00 mL/g Silica gel (isotherm) SRD (isotherm)
Scrub timeline slow-mo
↤ cycle 1 slow-mo fast cycles →

Cycle

1

Current RH

50%

Silica gel saturation 0%

Cap 0.4 mL/g

⚠ REPLACE
SRD saturation 5%

Cap 0.87 mL/g

↻ 0 cycles complete

Scope-direct proof

Lab IP66 test — compact sensors

Lab IP66 test conducted by So Sponge directly applicable to compact agricultural weather sensors (volumes 0.3-2 L).

ConfigurationResult
Bare housing (control)Significant fogging from 30 minutes
Housing with pressure ventFogging matching control
Housing with AS-B stickerNo fogging over test duration
Read the full test →

FAQ

Weather agricultural sensors and anti-condensation

Does AS-B impact my LoRaWAN sensor's 5-10 year battery autonomy?

No, this is precisely a key argument for this vertical. AS-B is fully passive (zero electrical consumption). The embedded battery's energy budget is fully preserved for radio, microcontroller, and sensors themselves. It's the only anti-condensation system compatible with a product positioned for "5-10 year battery life".

Is AS-B compatible with humidity measurement sensors (soil moisture probes, leaf wetness)?

AS-B is a regulator, not absorber. It keeps the communication housing's internal air close to outdoor ambient (avoiding drift from IP65 thermal breathing). For soil moisture probes measuring soil directly via a separate cell, AS-B sits in the separate electronic compartment — it doesn't disturb the soil measurement.

Difference vs the Industrial Instruments LP?

Industrial Instruments LP targets high-precision instruments deployed in controlled industrial environments (GMP pharma, semicons, airports) with certified accuracy and annual lab calibration. This Weather/Agricultural Sensors LP targets low-power LoRaWAN/Sigfox IoT sensors deployed in field with 5-10 year battery autonomy. Very different personas and budgets.

Is AS-B compatible with Pessl METOS, Davis Vantage Pro, Sensoterra, Sentek?

Yes without interaction. AS-B is a passive accessory inside the electronic compartment, with no modification of external enclosure or sealing gaskets. IP65/IP66/IP67 certification preserved. SRD material is REACH and RoHS compliant.

Compatibility with LoRa, Sigfox, NB-IoT, LTE-M radio modules?

Yes without electromagnetic or electrical interaction. SRD material is passive, non-metallic, doesn't act as a Faraday cage and doesn't disturb radio link budget. Bonus: by reducing housing humidity, AS-B stabilizes RF losses on high-frequency components, indirectly improving range and transmission reliability.

On my sensors deployed in tropical humid climate?

Precisely the use case where AS-B delivers maximum value. Atmospheric humidity density in tropical zones creates a permanent cumulative load on outdoor sensors. AS-B keeps internal RH stable independently of external RH (up to 95-100% in tropical climate). Relevant for SE Asia, Latin America, Sub-Saharan Africa deployments.

What about my fleet of sensors already deployed in agricultural parcels?

Field retrofit rarely cost-effective individually. Recommended strategy: integrate AS-B at next sensor renewal (during a hard failure or firmware/hardware upgrade), to ensure protection over the new sensor's full lifetime.

MOQ and lead time for a sensor manufacturer?

Standard MOQ: 5,000 units AS-B/XS, 10,000 units AS-B/S+. Lead time 6-8 weeks. Express on request.

Performance in cold climate (mountain, high-altitude viticulture)?

AS-B operating range: -20 °C to +70 °C. Capillary adsorption mechanism functional across the range.

CSRD and carbon reporting?

Yes. By extending real sensor lifetime and reducing replacement frequency, AS-B reduces scope 3 carbon footprint reported annually. Relevant for sensor network operators and large agricultural accounts.

Evaluation

Request your free samples

Test AS-B sticker on your own agricultural weather sensors. So Sponge provides free samples for B2B evaluation and offers a free sizing study for multi-model deployments.

Request samples → Quote AS-B → Request information →

Going further

Related technical resources

Lab IP66 climate chamber test30°C → 0°C cycle, 3 configurations compared→ Outdoor IoT enclosuresSister page — adjacent vertical→ Outdoor & agricultural roboticsSister page — adjacent vertical→ Industrial instruments & measurementSister page — differentiated vertical→ Urban sensors & smart citySister page — differentiated vertical→ Understand the SRD materialThe So Sponge material in detail→