Onset S-SMC-M005 Specifications

Soil Moisture Smart Sensor (S-SMx-M005) Manual

Soil moisture smart sensors are used for measuring soil water content and are designed to work with smart sensor-compatible HOBO® stations. They combine the innovative ECH2O® Dielectric Aquameter probe from Decagon Devices, Inc. with Onset’s smart sensor technology. All sensor conversion parameters are stored inside the smart sensor adapter so data is provided directly in soil moisture units without any programming or extensive user setup.

Specifications

S-SMC-M005

Measurement Range In soil: 0 to 0.550 m³/m³ (volumetric water content)

Extended Range -0.401 to 2.574 m³/m³; see Note 1

Accuracy ±0.031 m³/m³ (±3.1%) typical 0 to 50°C (32° to 122°F) for mineral soils

Resolution 0.0007 m³/m³ (0.07%)

Volume of Influence 0.3 liters (10.14 oz)

Soil Moisture Smart Sensor

Models: S-SMC-M005

S-SMD-M005

Sensor Frequency 70 MHz

Soil Probe Dimensions 89 x 15 x 1.5 mm (3.5 x 0.62 x 0.06 in.)

Weight 180 grams (6.3 oz)

Decagon ECH2O Probe Part No. EC-5

Sensor Operating Temperature 0° to 50°C (32° to 122°F). Although the sensor probe and cable can

Item included:

• Protective cap

Bits per Sample 12

Number of Data Channels* 1

Measurement Averaging Option No

able Length Available 5 m (16 ft)

Length of Smart Sensor Network Cable*

* A single HOBO station can accommodate 15 data channels and up to 100 m (328 ft) of smart sensor cable (the digital

communications portion of the sensor cables).

Note 1: The sensor is capable of providing readings outside the standard volumetric water content range. This is

helpful in diagnosing sensor operation and installation. See the Operation section for more details.

Note 2: This is a system level accuracy specification and is comprised of the probe’s accuracy of ±0.03 m³/m³ typical

(±0.02 m³/m³ soil specific) plus the smart sensor adapter accuracy of ±0.001 m³/m³ at 25°C (77°F). There are additional temperature accuracy deviations of ±0.003 m³/m³ / °C maximum for the probe across operating temperature environment, typical <0.001 m³/m³ / °C. (The temperature dependence of the smart sensor adapter is negligible.)

Note 3: Given the nature of the sensor design and sensor operating frequency, the system has inherent

susceptibilities to Radio Frequency signals. The accuracy specification when subjected to certain RFI environments, such as those outlined in IEC 61000-4-3 and IEC 61000-4-6, is reduced to 0.061 m³/m³.

The system level accuracy will be particularly affected when placed in an electric field of 3 V/m or greater in the 70 MHz range. RFI mitigation practices and physical deployment changes may reduce the systems susceptibility.

up to 8 dS/m and ±0.020 m³/m³ (±2%) with soil specific calibration; see Notes 2 and 3

safely operate at below-freezing temperatures (to -40°C/F) and the smart sensor tube (the white portion of the sensor cable that houses the electronics) can be exposed to temperatures up to 70°C (158°F), the soil moisture data collected at these extreme temperatures is outside of the sensor’s accurate measurement range.

0.5 m (1.6 ft)

The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

15081-E MAN-S-SM

Soil Moisture Smart Sensor (S-SMx-M005) Manual

Specifications (continued)

S-SMD-M005*

Measurement Range In soil: 0 to 0.570 m³/m³ (volumetric water content)

Extended Range -0.659 to 0.6026 m³/m³; see Note 1

Accuracy ±0.033 m³/m³ (±3.3%) typical 0 to 50°C (32° to 122°F) for mineral soils

Resolution 0.0008 m³/m³ (0.08%)

Volume of Influence 1 liter (33.81 oz)

Sensor Frequency 70 MHz

Soil Probe Dimensions 160 x 32 x 2 mm (6.5 x 1.25 x 0.08 in.)

Weight 190 grams (6.7 oz)

Decagon ECH2O Probe Part No. 10HS

Sensor Operating Temperature 0° to 50°C (32° to 122°F). Although the sensor probe and cable can

Bits per Sample 12

Number of Data Channels** 1

Measurement Averaging Option No

able Length Available 5 m (16 ft)

Length of Smart Sensor Network Cable**

* HOBOware® 3.2.1 or greater is required for the S-SMD-M005 model only (if using HOBOware).

** A single smart sensor-compatible HOBO station can accommodate 15 data channels and up to 100 m (328 ft) of smart

sensor cable (the digital communications portion of the sensor cables). Note that the S-SMD-M005 smart sensor uses more battery power than other models. Therefore, when connecting this smart sensor to H21-00x loggers that use 4 AA batteries, attach no more than 6 of these sensors to maintain battery life of one year.

Note 1: The sensor is capable of providing readings outside the standard volumetric water content range. This is

helpful in diagnosing sensor operation and installation. See the Operation section for more details.

Note 2: This is a system level accuracy specification and is comprised of the probe’s accuracy of ±0.03 m³/m³ typical

(±0.02 m³/m³ soil specific) plus the smart sensor adapter accuracy of ±0.003 m³/m³ at 25°C (77°F). There are additional temperature accuracy deviations of ±0.003 m³/m³ / °C maximum for the probe across operating temperature environment, typical <0.001 m³/m³ / °C. (The temperature dependence of the smart sensor adapter is negligible.)

Note 3: Given the nature of the sensor design and sensor operating frequency, the system has inherent

The system level accuracy will be particularly affected when placed in an electric field of 3 V/m or greater in the 150 KHz to 1000 MHz range. RFI mitigation practices and physical deployment changes may reduce the systems susceptibility, however will yield reduced system accuracy. If deployments are planned in high RFI energy environments, Onset recommends on-site testing to determine system level accuracy.

up to 10 dS/m and ±0.020 m³/m³ (±2%) with soil specific calibration; see Notes 2 and 3

0.5 m (1.6 ft)

The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

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Onset S-SMC-M005 Specifications

Specifications and Main Features

Frequently Asked Questions

User Manual