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Measurement

Units

Percent volumetric water content

Resolution

0.1%

Accuracy

±3.0% volumetric water content

with electrical conductivity < 2 dS m

–

Range

0% to saturation (

Saturation is typically

around 50% volumetric water.

)

Power

4 AAA alkaline batteries

Approximately 12 month life

Logger Capacity

2320 readings without GPS, 1160 read-

ings with GPS/DGPS

Display

16 character, 2 line LCD

Weight

3 lbs. (1.4 kg)

Probe Head

Dimensions

3.1”

3”

1”

(7.8cm x 7.5cm x 2.5cm)

Rod Dimensions

Length :

0.5”

(1.3cm),

1.0”

(2.5cm),

1.5”

(3.8cm),

3”

(7.6cm),

4.7”

(12cm) or

7.9”

(20cm)

Diameter:

0.2”

(0.5cm)

Spacing:

1.3”

(3.3cm)

Specifications

The internal data logger and RS

232 port are compatible

with GPS/DGPS. The data logger

’

s LCD screen will

display the data in one of three modes (see MODE button

p. 8):

Volumetric water content

in Standard or High Clay

mode

Relative water content

up to 2 RWC modes can be

established

Measurement period

in microseconds

Содержание FieldScout TDR 300

Страница 1: ...TDR 300 Soil Moisture Meter PRODUCT MANUAL Item 6430FS ...

Страница 2: ... Water Content 24 Specifications 26 Appendix 1 Checking VWC Readings 27 Appendix 2 Soil Specific Calibration 28 Appendix 3 Troubleshooting 30 This manual will familiarize you with the features and operation of your new Field ScoutTM TDR 300 Soil Moisture Meter Please read this manual thoroughly before using your instrument For customer support or to place an order call Spectrum Technologies Inc at...

Страница 3: ...idly take many measurements The us er can quickly transition between taking VWC readings in standard and high clay mode The meter s built in data logger can record data from several sites and elim inates the need to record data manually Through the software available from Spectrum website the user can download the data change the logger settings and program the logger to record relative water cont...

Страница 4: ...Shaft dimensions 1 3 3 0 3 1 The following are the dimensions of a fully extended shaft It is possible to reduce the length of the meter by 2 5cm by adjusting the lower half of the shaft 14 4 20 16 Meter ...

Страница 5: ...k PC cable to interface with Field Scout soft ware This cable connects to the 9 pin serial port of your computer and to the meter s computer port The meter s configuration can be modified by clicking on the Meter Settings button see Meter Settings p 16 The Com Port Meter Type Download Clear Memory and Me ter Settings buttons are explained in the Field Scout Software Toolbar section p 14 Changing t...

Страница 6: ...device such as a modem is probably connected to that port If the No Connection message is displayed this port may be the one connected to your serial cable and you can proceed to the next step 3 Place a paperclip on the end of the serial pin so that it touches both the tip of the pin and the metal area between the two black rings Again click on the Test Port button If the Connection OK message now...

Страница 7: ...ogger 75 Full No GPS Found Sample meter power up screens with datalogger enabled left screen indicates GPS signal was found If you are using GPS but the meter doesn t find the GPS signal when powering up the meter will not search for the GPS signal when taking readings Turn the meter off and on so it can look for the GPS signal Once the signal is found GPS information will be included in the data ...

Страница 8: ...gh clay measurement calibration for the 1 5 rods The meter will display dashes if this mode rod length combination is selected Changing Rod Length In order to get accurate volumetric or relative water con tent VWC or RWC readings the rod length setting must be correct In the VWC modes the currently selected rod length appears in the lower left corner of the LCD screen The options are Long 7 9 Medi...

Страница 9: ...Error Memory Full To resume normal op eration the logger memory must be cleared using the Clear Memory button in Field Scout software see p 15 READ When the DELETE CLR AVG button is pressed and immediately released the last data point will be taken out of the logger file and removed from the running aver age Pressing and holding this but ton will reset the running average but will not affect data ...

Страница 10: ...ned by rod length the calibration should not be done with rods that are significantly reduces in size because of wear The calibration procedure is as fol lows 1 Use the MODE button to put meter in Calibration mode see p 8 Hit the READ button 2 Hold the meter so the rods are in the air Press the READ button and wait until the meter indicates it is ready 3 Immerse the rods completely in distilled or...

Страница 11: ...t rod length setting see Changing Rod Length p 8 Select the correct mode setting see Data Collection Modes p 8 This will bring you to one of the data col lection screens The TDR 300 can be set to one of two VWC modes Standard or High Clay The Standard mode will be appropriate for most mineral soils The High Clay mode will be more accurate for soils with higher clay contents 27 In VWC mode the top ...

Страница 12: ...eriod mode This mode is intended primarily for soil specific calibrations Push the rods into the soil When taking a measurement it is important that the rods be fully inserted into the soil If not part of the sampling volume will be composed of air and the reading will be inaccurately low For the same rea son the probe should be inserted with a steady downward pressure If the rods are wiggled into...

Страница 13: ... This serves to protect the TDR block electronics from potential damage that could be caused by excessive force Occasional rod bending is normal and can be expected during the course of sampling Longer rods will be more susceptible to bending than shorter rods If bending oc curs rods should simply be bent back to parallel position perpendicular to the TDR block Measurements will con tinue to be ac...

Страница 14: ...a port Select the Com Port that is as signed to the computer data port See Identifying the Correct Com Port p 6 for instructions on how to determine which port to select Meter Type Select the TDR option from the list of available Field Scout meters Field Scout software Toolbar ...

Страница 15: ... where it will be saved When the file has been saved the software will give you the option of immediately viewing the file The data file is stored as a comma delimited text file and may be viewed in text editor or spreadsheet software Clear Memory Data is not automatically removed from the logger memory after a download The Clear Memory button clears all data from the logger memory Meter Settings ...

Страница 16: ...search for a GPS signal when the meter is turned on If a signal is found position data will be stored along with the soil moisture data If no GPS sig nal is available when the logger is turned on the logger will no longer look for one when measuring and re cording soil moisture data If the second box is checked the logger will store the GPS value only if it has been differentially corrected In gen...

Страница 17: ... bottom of the screen select which VWC calibration Standard or High Clay should be used for each RWC mode Each of these modes can be given a descriptive name of 5 characters These names can be used to identify a certain field or soil type Finally for an RWC mode to be available it must be ena bled by checking the Enable Display box If this box is not checked that RWC mode will not appear on the LC...

Страница 18: ...the GPS signal is found while taking geo referenced readings the LCD will briefly display the message Reading GPS before displaying the measurement If the GPS signal is lost during a series of readings or if the specified differential correction is not found the LCD will read Reading GPS ERR before returning to measure ment mode In this case the data will be recorded without latitude and longitude...

Страница 19: ... cable has a 9 pin male connection and a stereo pin that connects to the meter s data port You will also need a cable that allows the GPS unit to connect to a 9 pin male serial port If this cable doesn t come standard with your GPS unit it should be available from the manufacturer This cable is general ly used to upload information from a computer to the GPS unit These components should be connect...

Страница 20: ...orld Geodetic Survey datum The fourth line shows the column headings for the rest of the data file Logging sessions are started and completed by turning the meter on and off The start of a logging session is indicat ed by the data line Logger Started If a GPS signal was found at the start of a logger session a time stamp is in cluded on the Logger Started line Sample data showing results of data c...

Страница 21: ...value measurement type and rod length The measurement type data field indicates whether the read ing is volumetric water content relative water content or measurement period For volumetric water content data the calibration equation Standard or High Clay for that data point will also be included in measurement type ...

Страница 22: ...remove any additional water Permanent Wilting Point The highest moisture content at which a plant can no longer extract water from the soil Additionally we can define Plant Available Water as the amount of water between Permanent Wilting Point and Field Capacity One rule of thumb is that irrigation should be initiated when half the Plant Available Water has been depleted Time Domain Reflectometry ...

Страница 23: ...The sampling volume is an elliptical cylinder that extends approximately 3 cm out from the rods The high frequency signal information is then converted to volumetric water content High amounts of clay or high electrical conductivity EC 2 dS m will attenuate the high frequency signal and affect the reading displayed by the meter Very high or ganic matter content will similarly affect the VWC read i...

Страница 24: ...C of 67 because 35 is 2 3 be tween 25 and 40 If the soil s volumetric wa ter content is outside the range of the set points it is possible to get a negative RWC or an RWC greater than 100 If the volumetric water contents for field capacity and permanent wilting point are the wet and dry set points respectively the RWC value will be equivalent to Plant Available Water PAW A general rule of thumb is...

Страница 25: ...ristics are similar to the volume of soil sampled by the probe The second line of the LCD gives the Average A of all readings taken the Number N of readings taken and the 5 symbol name given to this soil type in the Meter Settings screen see p 16 ...

Страница 26: ...ay 16 character 2 line LCD Weight 3 lbs 1 4 kg Probe Head Dimensions 3 1 x 3 x 1 7 8cm x 7 5cm x 2 5cm Rod Dimensions Length 0 5 1 3cm 1 0 2 5cm 1 5 3 8cm 3 7 6cm 4 7 12cm or 7 9 20cm Diameter 0 2 0 5cm Spacing 1 3 3 3cm Specifications The internal data logger and RS 232 port are compatible with GPS DGPS The data logger s LCD screen will display the data in one of three modes see MODE button p 8 1...

Страница 27: ...gs can be taken in three standard environ ments air distilled water and playground sand saturated with distilled water It is important that any troubleshooting be done with distilled wa ter Readings taken in tap water can differ greatly from the expected re sults observed in distilled water When readings are taken in water and saturated sand the container should have a diameter of at least 3 inche...

Страница 28: ...adually wetting a known volume soil with the addition of known increments of water In most cases however the calibra tion will be done with gravimetric sampling This proce dure is briefly described below In the field establish a number of sites to sample Each site should be wetted to a different soil moisture content by adding varying amounts of water At each site a Field Scout TDR reading is take...

Страница 29: ...the gravimetric water content and soil bulk density VWC GWC b w Where GWC is the gravimetric water content and b is the bulk density GWC 100 Mwet Mdry Mdry b Mdry Vtot The final step is to plot the calculated the measured period values with the readings obtained from Field Scout TDR meter Regression analysis can then be performed on this data to develop an equation to convert from period to VWC ...

Страница 30: ...r switch to Standard calibration mode 2 The probe block is damaged Meter must be returned for repair Contact Spectrum Technologies or your distributor to obtain a Return Goods Authorization RGA number 3 I am getting VWC values near 0 for all measurements even in very wet soil Most likely a circuit component in the display is damaged and must be repaired Contact Spectrum Technologies or your dis tr...

Страница 31: ...return to normal operating mode 8 I m getting a Memory Full message The meter must be connected to Field Scout software to clear the memory see p 15 This product is warranted to be free from defects in material or workmanship for one year from the date of purchase During the warranty period Spectrum will at its option either repair or replace products that prove to be defective This warranty does ...

Страница 32: ...326 1 2006 EN 61000 4 2 1995 including A1 1998 and A2 2001 EN 61000 4 3 2002 As a consequence of the meter s measurement principle radio frequencies less than 950 MHz can affect the meter s readings Operating the meter in areas where such transmissions are present should be avoided EN 55011 2007 Douglas L Kieffer Soil Water Products Manager March 18 2009 3600 Thayer Ct Aurora IL 60504 800 248 8873...

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