Delta-T Devices SM200 Manual de usuario

SM200

Soil Moisture Sensor

Quick Start Guide Version 1.3

Delta-T Devices Ltd

SM200 overview

1Cables

3HH2

4Data Loggers

2Installation

1 Cables and Accessories

1.1m

10m

25m

5m bare end

Insertion rods are available for installing the SM200 in an augered hole.

2 Installation

Surface installation and spot measurements

 Clear away any stones. Pre-form holes in very hard

soils before insertion.

 Push the SM200 into the soil until the rods are fully

inserted. Ensure good soil contact. Best results are

achieved by inserting the SM200 horizontally.

 If you feel strong resistance when inserting the

SM200, you have probably hit a stone. Stop, and re-insert at a new location.

Installing at depth

 Auger a 45mm diameter hole. ~10° to vertical is

recommended.

 Fit insertion rod to SM200 - remember to pass the

cable through the insertion rod and fit the connector

first.

 Push the SM200 into the soil until rods are fully

inserted. Ensure good soil contact.

 Backfill around the insertion rod.

Alternatively

 Dig a trench, and install horizontally (see overview diagram).

HH2

cable

Extension

cables

Logger

cable Extension cables can be joined up to

a recommended maximum of 55m.

Align the connectors carefully

before pushing parts together.

Screw together firmly to ensure the

connection is water-tight.

Power V+

nal

Ground

Device:

vSM200

Soil Type:

vMineral

3 HH2 Meter

 Connect the SM200 to the HH2 meter.

 Press Esc to turn the meter on, and if necessary

press again until the HH2 displays the start-up screen.

 Set the meter to read from an SM200:

►Press Set and scroll down to the Device option.

►Press Set again and scroll down to select

SM200.

►Press Set to confirm this choice.

 Make sure the HH2 is correctly configured for your soil type:

►At the start-up screen, press Set and scroll down to the Soil Type option.

►Press Set again and scroll down to the appropriate soil type (use Mineral

for sand, silt or clay soils or Organic for peaty

soils)

►Press Set to confirm this choice.

 Choose the units you want for displaying readings.

►At the start-up screen, press Set and scroll down to the Display option.

►Press Set again and scroll down to select units.

►Press Set to confirm this choice.

 Press Read to take a reading.

 Press Store to save or Esc to discard the reading.

 Remove the SM200 from the soil and move to a new location...

 If you have saved data, connect your HH2 to a PC and run

HH2Read to retrieve the readings.

SM200 Store?

20.3%vol

4 Data Loggers

GP1

 2 SM200s can be connected to each GP1 - the SM200

should be connected as a single-ended, powered sensor.

These details illustrate connections for Channel1:

SM200 wiring Colour GP1 terminal

Power V+ Red CH1 (PWR)

Signal White

CH1 (+)

Ground Shield

CH1 (GND)

and CH1 (-)

 Configure the GP1 by choosing “SM200”

from the sensor menu in PC DeltaLINK or

Pocket DeltaLINK.

For configuration details see the GP1 Quick Start Guide.

DL6

 Up to 6 SM200s can be connected to each DL6 with each

sensor connected as a single-ended, powered sensor.

These details illustrate connection to Channel1:

SM200 wiring Colour DL6 terminal

Power V+ Red V+

Signal White

IN+

Ground Shield

IN-

and 0V

 Configure the DL6 by choosing “SM200”

from the sensor menu in DeltaLINK.

For configuration details refer to the DL6 User

Manual.

DL2e

 Up to 60 SM200s can be connected to each DL2e with

each sensor connected as a single-ended, powered

sensor.

These details illustrate connection to Channel 58 using

the LAC1 input card configured in 15-channel mode,

and warm-up channel 63:

SM200 wiring Colour DL2e terminal

Power V+ Red 63 NO

Signal White

58+

Ground Shield

58-

and 61-

 Configure the DL2e by choosing one of the

SM200 sensor codes from the LS2Win

sensor library, according to your soil type.

For configuration details see the DL2e User Manual.

Other data loggers

 The SM200 should be connected as a single-ended, powered sensor.

 Configure the logger input as a voltage sensor, approximately 0 to 1.0 volts

corresponding to ~0 to 60% water content – see next section.

 The SM200 has

been optimised for

a 1 second warm-

up period

(minimum period

200ms).

It is recommended

that the sensor is

not powered

continuously.

a0a1

Mineral 1.6 8.4

Organic 1.3 7.7

Example

 Take a reading with the SM200 V= 0.294 volts

either

 Convert the reading to √ε using the polynomial or

linearisation table below. √ε = 3.62

 Then convert √ε to soil moisture, θ, using the soil

calibration values (a0, a1). θ= 24.0%

or (for mineral soil)

 Convert directly for mineral or organic soils θ= 24.0%

5 Convert SM200 voltages to soil moisture readings

Note: The SM200 output is automatically converted to soil moisture when using an

HH2 meter or Delta-T data loggers.

Conversion to √ε

Polynomial (use for SM200 readings from 0 to 1.1 Volts)

5432 536.13032.46881.60725.38103.160.1 VVVVV +−+−+=

where Vis the SM200 output in volts

Linearisation table (use for SM200 readings from 0 to 1.2 Volts)

V√ε V√ε V√ε V√ε V√ε

0.000 1.011 0.120 2.461 0.260 3.442 0.820 5.936 1.150 7.661

0.030 1.447 0.150 2.718 0.310 3.700 0.960 6.586 1.200 8.039

0.060 1.832 0.180 2.946 0.400 4.105 1.040 6.991 1.220 8.264

0.090 2.168 0.220 3.211 0.600 4.953 1.100 7.333 1.800 9.000

Conversion from √ε to Soil Moisture

 Soil moisture

(

)

10 aa−=

εθ

 Use these generalised soil calibration values for

mineral and organic soil types, or carry out a soil-

specific calibration to derive your own values – see SM200 User Manual.

 Multiply x100 to convert soil moisture from m3.m-3 to % volumetric.

Direct conversion for Mineral and Organic soils

5432

mineral 611.148.5248.761.4917.1071.0 VVVV +−+−+−=

5432

organic 758.1978.5907.7029.5091.2039.0 VVVVV +−+−+−=

6 Specifications

* Accuracy figures apply to calibration soils and over 0 to 60°C.

Percentages quoted as %vol are % volumetric water content.

7 Care and Safety

Notices

All parts of the SM200 design and documentation are the exclusive property of Delta-T

The SM200 product is CE compliant, conforming to EN61326:1997.

Delta-T Devices Ltd

128 Low Road

Burwell

Cambridge CB5 0EJ

England (UK)

Tel: +44 1638 742922

Fax: +44 1638 743155

E-mail: [email protected]

Web: www.delta-t.co.uk

 The rods of the SM200 are sharp in order to ease insertion. Care must be

taken and handling precautions followed.

 Avoid touching the rods or exposing them to other sources of static damage.

Keep the SM200 in its protective tube when not in use.

 Take care when attaching cables to ensure that the connectors are clean,

undamaged and properly aligned before pushing the parts together.

Screw together firmly to ensure the connection is water-tight. If the connector

is damaged, apply a light smearing of silicon grease to maintain sealing.

 Do not pull the sensor out of the soil by its cable.

 If you feel strong resistance when inserting the SM200 into soil, it is likely you

have encountered a stone. Stop pushing and re-insert at a new location.

Range and Notes

Accuracy* ±3 %vol 0 to 50 %vol

Salinity errors ± 3.5 %vol 0 to 40 %vol, over 50 to 500 mS.m-1

(0.5 to 5 dS.m-1)

Power requirement 5 to 14V

15mA typical

1 second warm-up recommended

200ms minimum

Output signal 0 to 1.0V Nominal 0 to 60 %vol

Environmental sealing IP68 Sensor buriable, sealed to IP68

Operating range -20 to +60°C Readings in frozen soil are not meaningful

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