Delta-T Devices WET150 Kit Manuel utilisateur

WET150 Kit

Quick Start Guide

version 3.0

The WET150 Kit

WET150 Sensor

Rapid and accurate

measurement of water

content, pore water EC

(ECp) and temperature

WET150 Meter

Display readings,

configure units and

soil calibrations, set

SDI-12 address

Batteries

Two standard alkaline

AA cells

Kit case

The WET150 Kit is

supplied in a small

protective case with

WET150, Meter and a

couple of spare

batteries

The WET150

Getting Started

Thank you for purchasing the WET150 Kit, Delta-T’s solution for portable monitoring

of water content, electrical conductivity and temperature. Your WET150 Kit already

has batteries fitted, so you can start working with it immediately. We recommend the

following steps:

1. Check the soil type and configuration are suitable for your application (see

‘Configuration’, page 5)

2. See section “Taking Readings” (page 4) for advice on how to get the best out

of the WET150 Kit.

Taking readings

1. Gently push the WET150 rods into the soil or substrate.

2. Press to take and display a reading.

The meter displays volumetric water content, temperature,

and pore water conductivity (ECp), unless the soil type is set

to RAW –see the “RAW soil type” section

Getting the best out of your WET150 Kit

Insertion technique

Consistency is key to getting the best results from your

WET150 Kit:

•Ensure the pins of the sensor are fully inserted into

the soil/substrate

•Avoid using too much force. Pushing too hard can compress looser

substrates like coir, which will change the readings. In soils, if you feel strong

resistance it may be that you have hit a stone. Stop and re-insert at a new

location to avoid damage to the sensor.

RAW soil type

If the soil type is set to RAW, the meter will display the underlying readings of

permittivity (ε’), temperature and bulk conductivity (ECb) instead of water content

and pore water conductivity (ECp):

Temperature

Note: the temperature sensor in the WET150 is internal to the white body, so it takes

over a minute to completely equilibrate. This can affect not just temperature

accuracy but also the ECp measurement accuracy, because the conductivity of typical

plant nutrients changes by ~2% per °C. The Meter’s ECp measurement is

compensated to 25°C. We recommend the WET150 is used as a portable sensor only

in well-equilibrated environments where the air temperature doesn’t differ

significantly from the soil/substrate temperature.

32.6%vol 23.4°C

159.2mS/m ECp

40.5 ε′ 19.6°C

100.9mS/m ECb

Configuration

Press [SET] to configure the meter or sensor. Scroll up or down to the option that you

want to configure, and press [SET] again to select. There are 5 menu options: Soil

type, Soil setup, Units, Address, and Contrast.

The WET150 measures permittivity, bulk conductivity and temperature directly. From

these measurements the Meter calculates pore water conductivity (ECp) and water

content. These calculations require user-configurable parameters which are stored on

the Meter handheld unit. By default, the Meter comes with generic parameters that

give comparable performance to the generic parameters in Delta-T’s well-regarded

WET2 sensor. We strongly recommend you review these settings. Best results will be

obtained with customised parameters for your specific medium; Delta-T also supplies

a list of generic parameters which give good performance for several common soils

and substrates. See the WET150 User Manual (available online) for more details.

Soil type

Select the soil type that will be used when calculating water content and ECp.

Definitions can be found in the WET150 User Manual.

Soil Setup

The ”Soil Setup” menu enables you to adjust the following parameters for each soil

type (except RAW):

▪Moisture a0

▪Moisture a1

▪Soil Parameter –this adjusts how the Meter calculates ECp

▪ECp dry limit –at low water contents, calculating ECp from permittivity and

ECb becomes unreliable. This option defines the “too dry” permittivity level

below which the Meter will not output ECp due to declining accuracy.

The “Back” option will return you to the list of available soil types.

The “Restore defaults” option will reset the selected soil type to its factory settings.

IMPORTANT: The configuration menu only adjusts the settings within the Meter

handheld unit. The only setting stored on the sensor which can be adjusted via the

Meter handheld unit is the SDI-12 address.

Units

This menu enables you to select which units are used to display EC and temperature

measurements.

}

These parameters adjust how the Meter calculates water

content

Address

Each SDI-12 sensor has an “address”, a 1-character code that it uses to recognise

when to respond to commands sent over a network of sensors.

The WET150 Meter can be used to set sensor addresses prior to their installation in a

network.

Contrast

LCD contrast can be adjusted up or down using the scroll buttons.

The available options for the configuration menus are as follows:

Troubleshooting sensor networks

SDI-12 sensor networks can include up to 62 sensors of various types and from

different manufacturers. A single malfunctioning sensor may prevent the whole

network from operating. The WET150 Meter can conveniently help locate faults.

The WET150 Meter can only take and display readings from WET150 sensors,

however it can display the address of most attached SDI-12 sensors with a compatible

power requirement*. Displaying the address checks that the attached sensor powers

up correctly and responds to an SDI-12 command. This can prove a useful diagnostic

aid when troubleshooting networks of SDI-12 sensors:

▪Divide the network up into groups of 5 to 10 sensors and attempt to take

readings from each group using your data logger / wireless module.

▪When a group is identified which does not respond, separate the individual

sensors and connect each in turn to the WET150 Meter (note non-WET150

sensors will display “sensor fault”).

▪For each sensor, press [SET], scroll down to Address and press [SET] again to

display the current SDI-12 address.

▪Remove any sensor that fails to correctly display its address.

* The WET150 Meter supplies 6 volts to attached sensors. Most SDI-12 sensors will

work fine with this, but please check the sensor specifications.

Soil Type

Conductivity

Temperature

SDI-12

Address

Soil Setup

(select soil type)

- Mineral

- Organic

- Peat mix

- Coir

- Mineral wool

- Custom

- RAW

- mS/m

- mS/cm

- μS/cm

- °C

- °F

- a to z

- 0 to 9

- A to Z

(62 total

available)

- Moisture a0

- Moisture a1

- Soil Parameter

- ECp dry limit

Outline specifications

Note [1]: The WET150 has been carefully optimised to provide

accurate readings in soils and substrates - readings taken in water or

air may not meet the full specification.

Please refer to the WET150 User Manual for further details and

important notes.

Volumetric Water Content (%vol)

Accuracy

± 3%vol (with a calibration matching the soil / substrate)

Range

Accurate range: 5 to 100%vol, ECb0 to 500mS.m-1

Full range: 0 to 100%vol [1]

Permittivity (ε’)

Accuracy

± (3% of reading + 0.8 ε’) 1 → 40 for ECp ≤ 800mS.m-1

± 5% of reading 40 → 80 for ECp ≤ 500mS.m-1

Range

Accurate range: 1 to 80, full range: 1 to 90

Bulk soil conductivity (ECb)

Accuracy

± (6% of reading + 10mS.m-1)

Range

Accurate range: 0 to 1200mS.m-1

Full range: 0 to 2000mS.m-1

Temperature

(the WET150 must be fully equilibrated with the soil to accurately measure soil temperature)

Accuracy

± 0.5 °C

± 0.7 °C

Range

Accurate range:

0 to +40 °C

Full range:

-20 to +60 °C

WET150

Interface

SDI-12 v1.3

Sealing

IP68

Sample volume

55 x 70 mm diameter (~1 litre needed for full accuracy)

Dimensions

143 x 40 mm diameter

Weight

77g

Warranty

5 years

Meter

Power requirement

2x AA alkaline batteries

Battery life

~2,400 readings

Dimensions

130 x 66 x 25 mm

Weight

160g

Warranty

2 years

Changing the batteries

You will need a small cross-head screwdriver to access the batteries.

▪Unscrew the 2 screws holding the battery cover in place, taking

care not to displace the fitted o-rings.

▪Remove and replace the 2 AA batteries, making sure to retain the

correct polarity.

▪Replace the 2 screws.

Note: All configuration settings will be retained.

Care and maintenance

▪Do not touch the WET150 rods or expose them to other sources of static

damage, particularly when powered up.

▪Ensure that the connector is clean, undamaged and properly aligned before

pushing the parts together. Screw together firmly for a water-tight seal.

▪If inserting the sensor into soil and you feel strong resistance, it is likely you

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

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

▪Protect the meter from heavy rain or submersion.

Delta-T Devices Ltd

130 Low Road, Burwell, Cambridge CB25 0EJ, UK

Tel: +44 (0) 1638 742922

[email protected] www.delta-t.co.uk

WET150_K-QG-01-3

WET150 Kit Quick Start Guide v3.0

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