Van Walt HD2 User manual

Operating Instructions
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com
HD2 – Mobile Moisture Meter
1
MA167V1_25/02/2016_JO

Operating Instructions
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com
HD2 – Mobile Moisture Meter
2
The HD2 is a portable device which serves for the display of measurement values
delivered by Trime moisture measurement sensors and was designed for mobile eld
deployment.

Operating Instructions
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com
HD2 – Mobile Moisture Meter
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1 General Notices............................................................................................................
1.1 Intended Use.................................................................................................................
1.2 The Chargeable Accumulator ...................................................................................
1.3 Charging the HD2 Portable Measuring Instrument ..................................................
1.4 Temperatures and Ambient Conditions.....................................................................
2 Control Elements ..........................................................................................................
2.1 Short Overview of the Key/Button Functions: ...........................................................
3 Initial Commissioning....................................................................................................
3.1 Safety Instructions ........................................................................................................
3.2 Checking the Delivery Scope ....................................................................................
3.3 Charging the Accumulator ........................................................................................
3.4 Connecting a Sensor ..................................................................................................
4 Operation ....................................................................................................................
4.1 Switching ON the HD2 Portable Measuring Instrument ..........................................
4.2 Switching OFF the HD2 Portable Measuring Instrument..........................................
4.3 Measurement ..............................................................................................................
4.3.1 Operating Mode „Normal“ .......................................................................................
4.3.2 Operating Mode „Average Value“ .........................................................................
4.3.3 Operating Mode „Continuous Measurement“ .......................................................
4.4 Settings .........................................................................................................................
4.4.1 HD2-Mode ...................................................................................................................
4.4.2 Material Calibration ...................................................................................................
4.4.3 Detecting Sensor/Probe.............................................................................................
4.4.4 Language ...................................................................................................................
4.4.5 Auto-Power-Off...........................................................................................................
4.4.6 Display Illumination ....................................................................................................
4.4.7 Display Contrast .........................................................................................................
4.4.8 Probe Info ...................................................................................................................
4.4.9 HD2-Info.......................................................................................................................
5 Technical Data HD2 ..................................................................................................
6 Handling of the TRIME-PICO Probes ........................................................................
6.1 Introduction ................................................................................................................
6.2 Measurement Volume of the PICO Probes............................................................
6.3 Measurement of laboratory samples in the bucket .............................................
7 Exchange of the Probe Rods...................................................................................
8 Technical Data TRIME-PICO probes ........................................................................
8.1 TRIME-PICO64 .............................................................................................................
8.2 TRIME-PICO32 .............................................................................................................
User Manual Portable Measuring Instrument HD2
Version April 2011
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Operating Instructions
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com
HD2 – Mobile Moisture Meter
4
1 General Notices
Please read the operating instructions carefully.
Should you have any further questions, please contact our service department under the
contact data depicted above. In no event should you attempt to open and repair the
device yourself. Should you like to le any guarantee claims, please contact the distribution
partner where you purchased the device. Within the scope of product improvements, the
device is subject to technical and optical changes.
1.1 Intended Use
This portable measuring instrument was designed to serve as a reading device for various
IMKO probes. Only respectively intended probes may be connected to the device. The
connection of a probe not intended for connection may lead to the destruction of the
device and/or the connected probe.
1.2 The Chargeable Accumulator
Never exchange the integrated accumulator yourself.
The stated maximum operating periods refer to ideal conditions. The ambient temperature
and the charging cycle can signicantly reduce the performance time. In addition, the
charging capacity reduces itself for technical reasons within the course of the utilisation of
the device or due to storage at very high or low temperatures.
1.3 Charging the HD2 Portable Measuring Instrument
Only deploy the respectively provided charger or a comparable power supply unit to
charge the HD2 port- able measuring instrument. Any deviation of the charging voltage can
lead to damage to the device.
Should the device heat up during the charging process, this is normal and not connected
with any hazards. Should the HD2 only function for a short period or not at all in spite of
several attempts to charge it, the integrated accumulator is defective and must be
exchanged. In this case, please contact our local distribution partner or us directly.
1.4 Temperatures and Ambient Conditions
The HD2 portable measuring instrument was designed for deployment under rough
conditions.
The operation of the device under conditions beyond those depicted may lead to damage
to the same.

Operating Instructions
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HD2 – Mobile Moisture Meter
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2 Control Elements
1. Button „Measurement“
2. Button „Menu“
3. Button „UP“
4. Button „DOWN“
5. Display
6. Probe/Charger Connection
2.1 Short Overview of the Key/Button Functions:
„UP“
- Selection of Menu
Item/ Setting
„DOWN“
- Selection of Menu Item/Setting
- Deletion of the Value Memory
(only for operation mode „Average
Value“)
„Measurement“
- Performance of a Measurement
- Selection of Menu Item
- Storing and Activation of a
Setting
- Power On / Off
„Settings“
- Concluding settings
- Leaving a Menu Item

Operating Instructions
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HD2 – Mobile Moisture Meter
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3 Initial Commissioning
3.1 Safety Instructions
Attention: Before initial commissioning, do not fail to read the General Notices, Item 1 at the front of these
operating instructions. Any not intended use may lead to damage to the device.
3.2 Checking the Delivery Scope
HD2 Portable Measuring Instrument Plug-in Power Supply Unit (12V/2A) Charging Adapter Protective
Hood Manual
3.3 Charging the Accumulator
The integrated accumulator should be charged before putting the device into operation the rst time.
For this purpose, plug in the provided charging adapter into the 7-pole socket of the HD2. Subsequently,
connect the plug-in power supply unit to the charging adapter. In the event that the device is already
switched on, or if the accumulator is exhaustively discharged, the charging process will commence
immediately. If not, switch on the HD2 by pressing the button „Measurement“ for approximately 1
second. An active charging process is signalised in the display by an animated accumulator symbol.
The integrated charging electronics charges the accumulator until the same is completely charged. In
case of exhaustive discharge, this will approximately take 2 hours. As soon as the charging process is
concluded, all 4 „accumulator bars“ will be permanently presented in the display and the trickle
charging will commence.
Attention: Only charge the accumulator at room temperature (approximately between 10°C and 30°C)!
At too low temperatures, it may happen that the charging concluding shut- down does not operate
safely and the accumulator is over-charged. Too high ambient temperatures may lead to damage to the
HD2 due to the additional heat-up during the charging process.
3.4 Connecting a Sensor
The HD2 portable measuring instrument can be operated with the following IMKO-moisture probes: Pico
64 Pico 32 Pico IPH
Connect the moisture probe to the HD2 by plugging in the 7-pole plug into the respectively provided
socket at the HD“ and fastening the coupling nut.

Operating Instructions
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HD2 – Mobile Moisture Meter
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4 Operation
Key/Button Designation:
Key/Button Designation
Measurement
- Shutting ON/OFF- press 1s
- Perform Measurement press shortly
- Selection of a Menu Item press shortly
- Storing a setting press shortly
Settings
- Conclude Settings
- Leave Menu Item
UP
- Back to previous Menu Item or Setting
Down
- Go to next Menu Item or Setting
- Deleting the Value Memory
(Mode – Average Value)
Display Symbols:
Symbol Designation
Residual Accumulator Capacity
Active Measurement
Settings are stored
Intensity of the Background Illumination
Remaining time until shut-down (illumination / APO)
Press button „UP“
Press button „DOWN“

Operating Instructions
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com
HD2 – Mobile Moisture Meter
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Text Meaning:
Text (German/ English)
Meaning
Kal.: Number of the active calibration in the probe
Cal.:
Feuchte: Moisture Measurement Value
Moist.: Notice: Depending on the set calibration, the measurement value may refer to
%vol, %grav or ns
Temp.:
Temp.: Temperature
EC-Trime: Radio-based-Conductivity
Seriennr.: Serial Number of the probe, respectively of the HD2
Serialno.:
HW: Hardware Version
FW: Firmware Version
4.1 Switching ON the HD2 Portable Measuring Instrument
Switch ON the HD2 by pressing the button „Measurement“ for approximately 1 second.
During the starting-up process, the HD2 will attempt to communicate with the connected probe. This
will take approximately 4 seconds. If no probe is connected, or the probe is not able to
communicate for any reason, an error message will be generated on the display. If the probe was
successfully detected, the accordingly set background of the operation mode will appear on the
display and the HD” is ready for deployment.
Notice: Should no connection to the probe be possible in spite of several attempts, check if
the probe is connected properly. Should this not deliver a positive result, please contact our service
department.
4.2 Switching OFF the HD2 Portable Measuring Instrument
Switch OFF the HD2 by pressing the button „Measurement“ for approximately 1 second.
Notice: It is not possible to shut off the HD2 while it is in the „Settings“. Please, rst leave the menu
item „Settings“ by pressing the button „Settings“ until the measurement display appears.
4.3 Measurement
The HD2 portable measuring instrument disposes of three operating modes:
1. Normal Individual Value Display – presents the measurement variables Moisture, Temperature
and the EC-Trime
2. Average Value presents the average value of the moisture of up to 6 individual measurements
3. Continuous Measurement continuously measures the measurement variables Moisture,
Temperature and the EC-Trime

Operating Instructions
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HD2 – Mobile Moisture Meter
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Notice: During a measurement, no further actions are possible. It is necessary to wait until the
measurement is concluded.
4.3.1 Operating Mode „Normal“
After switching on the HD2 portable measuring instrument, the following display will appear in the
operating mode „Normal“ after the start screen:
In order to initiate a measurement, shortly press the button “Measurement” . The measurement
will commence and a turning symbol will appear instead of the accumulator-symbol in the upper
right hand corner. During this period, no other actions can be performed. The measurement requires
approximately 4 to 5 seconds. Once the measurement is concluded, the accumulator-symbol will
reappear and the measured values will be generated on the display. The display of the values will be
maintained until a new measurement is conducted.
4.3.2 Operating Mode „Average Value“
In this operating mode, only the moisture is measured and an average value of up to 6 individual val-
ues is evaluated. Depending on the set calibration, either the volumetric or the gravimetric moisture is
presented. After switching on the HD2 portable measuring instrument, the following display will ap-
pear in the operating mode „Average value“ after the start screen:
Number of the selected
Calibration
Serial No. of
the connected
Probe Residual Accumulator Capacity
Name of the selected Calibration
Measurement Value Moisture
Measurement Value Temperature
Measurement Value TDR-Conductivity
Individual Values of
the Measurements
Number of the selected Calibration
Residual Accumulator Capacity
Average Value of the Measurements

Operating Instructions
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com
HD2 – Mobile Moisture Meter
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In order to initiate a measurement, shortly press the button “Measurement” . The measurement will
commence and a turning symbol will appear instead of the accumulator-symbol in the upper right
hand corner. During this period, no other actions can be performed. The measurement requires
approximately 4 to 5 seconds. Once the measurement is concluded, the accumulator-symbol will
reappear. On the left hand side of the display, the individual values of the measurements will be
presented. The currently measured value is presented at Position 1 and old values will be shifted one
position onwards. The arithmetic average value is displayed on the right hand side. The average value is
calculated out of the existing individual values up to a number of 6 values.
Notice: Only a maximum of 6 values can be stored in the list. Older values are removed from the
list and are no longer involved in the formation of the average value.
In order to delete the measurement series, actuate the button „Down“ .
TIPP:
4.3.3 Operating Mode „Continuous Measurement“
In this operating mode, the measurement variables Moisture, Temperature, and the EC-Trime are
determined. The continuous measurement is initiated by actuating the button „Measurement“ . The
same is concluded by actuating the button „Measurement“ once more. The currently pending
measurement is performed completely once more and the sequence is concluded.
4.4 Settings
There are various options to modify and align the settings of the HD2 portable measuring instrument. You
will reach the following menu conguration by actuating the button „Settings“ :
By actuating the buttons „Up“ and „Down“ the entry intended for processing can be marked and
subsequently be selected with the button “Measurement” . You can exit the current menu item, and
also the menu “Settings”, with the button “Settings” .

Operating Instructions
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com
HD2 – Mobile Moisture Meter
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Settings
(German/English)
Designation
HD2-Modus
HD2-Mode
Switching the Operating Mode
- „Normal“ measurement of the variables Moisture,
Temperature, and EC-Trime
- „Average Value“ determination of the average value of up
6 individual moisture measurement values
- „Continuous Measurement“ ditto
Materialkalibrierung
Material calibration
Choosing the needed Material Calibration
Sonde suchen
Detect Probe
A new search for a connected probe (if an error has
occurred during the activation of the device)
Sprache
Language
Switching the System Language -German -English
Auto-Power-Off Setting of the automatic shut-down
Displaybeleuchtung
Display Illumination
Setting of the Background Illumination
- Turn-Off-Time
- Intensity
Displaykontrast
LCD-Contrast
Setting of the ideal contrast
Sondeninfo
Probe Info
Issues various information regarding the probe
HD2-Info Issues various information regarding the HD2 portable
measuring instrument
4.4.1 HD2-Mode
In this menu item, the operating mode of the HD2 portable measuring instrument can be changed.
With the selection „Normal“, an individual measurement of the three probe parameters Moisture,
Temperature and the EC-Trime is selected. The parameter Moisture, depending on the selected
calibration, the moisture in volumetric or gravimetric percentages or can state the running period of the
TDR pulse. In case of the display of the running period, the percent-symbol must be understood as „ns“.
When selecting “Average Value”, depending on the selected calibration, only the moisture in %vol or
%grav, respectively the running period in ns, is determined. The measured value is stored in a list of up to 6
measurement values. The arithmetic average is formed out of this list.
Notice: Only a maximum of 6 values can be stored in the list. Older values are removed from the list
and are no longer involved in the formation of the average value.

Operating Instructions
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HD2 – Mobile Moisture Meter
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By actuating the buttons „Up“ and „Down“ , the entry intended for processing can be marked
and subsequently be selected with the button “Measurement” . After the selection, the symbol will
appear in the upper right hand display corner which indicates that the selection is activated and has
been stored.
4.4.2 Material Calibration
Depending on the task of the deployment, various calibrations are deposited in the probe. These can
be volumetric calibrations for grounds of various densities, gravimetric calibrations for the measurement
of sand moisture contents, or also running period calibrations. You can select the calibration required for
your application within the menu item „Material Calibration“. This enables to cover a multitude of
deployment options with merely one probe. After the selection of the menu item „Material Calibration“,
the 15 calibration options are called up by name which requires a short moment of time. Subsequently
a display in a similar form as follows will be generated:
The list can be scrolled and the wanted calibration be selected by actuating the buttons „Up“ and
„Down“ The “!“ in front of a calibration indicates the currently active one. You can set the selected
calibration to become the active one by actuating the button „Measurement“ After a short
moment, the symbol will appear in the upper right hand display corner to indicate that the selection
has been activated. In addition, the „!“ will be placed in front of the now active calibration.
4.4.3 Detecting Sensor/Probe
In the event that communication problems arise with the probe at the activation of the HD2 portable
measuring instrument, or if no probe was connected, or it is intended to exchange the probe during
operation, this menu item should be selected. After selection of this menu item, the HD2 will again
attempt to establish a connection to the connected probe. If this attempt is successful, the serial num-
ber of the probe will appear in the display.
Should a connection not be possible, „No probe detected“ will be generated on the display.
Notice: Should no connection to the probe be possible in spite of several attempts, check if the
probe is connected properly. Should this not deliver a positive result, please contact our
service department.

Operating Instructions
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HD2 – Mobile Moisture Meter
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4.4.4 Language
In this menu item, the language of the HD2 portable measuring instrument can be selected.
Currently, the user has the choice between the languages English and German. You can select the
desired language by actuating the buttons „Up“ and „Down“ and activate the same via the
button „Measurement“ After activation of the language, the symbol will appear in the upper
right hand corner of the display.
4.4.5 Auto-Power-Off
In the menu item „Auto-Power-Off“, you can select an automatic shut-down offered in various time
periods. Hereby, you can select between the following shut-off times:
- 1 Minute
- 2 Minutes
- 5 Minutes
- 10 Minutes
- 20 Minutes
Respectively also deactivate the automatic shut-down function (Display „—min“). For this purpose,
select the desired shut down time by actuating the buttons „Up“ and „Down“ and activate the
same via the button „Measurement“ After activation, the symbol will appear in the upper right
hand corer of the display.
Notice: The HD2 will only automatically shut down, if no further button is actuated. Any
actuation of a button will lead to the shut down time to start again.
4.4.6 Display Illumination
If required, the background illumination of the display can be individually adjusted. Consequently,
this enables the option to save power and to prolong the operational period.
After the selection of the menu entry, the following screen will be presented on the display:
The selection of the background illumination, respectively the time until the automatic shut-down of
the same is selected via the button „Up“ by actuating the same several times. Using the
button „Down“ you can adjust the intensity of the illumination, respectively turn the same
completely off. Activate and store your settings by actuating the button „Measurement“ After
activation, the symbol will appear in the upper right hand corner of the display.

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HD2 – Mobile Moisture Meter
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4.4.7 Display Contrast
At extreme temperatures, it may be necessary to adjust the contrast of the display in order to
be able to clearly read the display. For this purpose, select the menu item „Display Contrast“
and then change the contrast by actuating the button „Up“ respectively „Down“
Activate and store your settings by actuating the button „Measurement“ After activation,
the symbol will appear in the upper right hand corner of the display.
4.4.8 Probe Info
By selecting this menu item, after a short moment, you will be issued various information
regarding the connected probe.
These are:
- Serial Number
- Probe Type
- Hardware Version (HW)
- Firmware Version (FW)
4.4.9 HD2-Info
By selecting this menu item you will be issued various information regarding your HD2 portable
measuring instrument.
These are:
- Serial Number
- Hardware Version (HW)
- Firmware Version (FW)
- Accumulator Capacity
- Accumulator Voltage

Operating Instructions
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HD2 – Mobile Moisture Meter
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5 Technical Data HD2
Height 36mm
Width 64mm
Length 150mm
Weight (With accumulator) app. 437g
Power Consumption Power Down ca. 35µA
Idle - Background Illum. OFF
- Background Illum. Max
ca. 26mA
ca. 56mA
Probe turned ON ca. 100mA
Measurement ca. 350mA
Measurement per Charge 20°C / Background Illum. Max
Mode – Continuous Measurement
ca. 5000
Connectable Sensors PICO64, PICO32, PICO-IPH
-30°C bis 80°C
-20°C bis 70°C
10°C bis 30°C
Nom. 12V, Max. 15V, Min. 12V
ca. 1A
At exhaustively discharged accumulator. 2h
Ni-MH (4 x 1.2V) (AA), 2000mAh, >1500 Measurements
RS485
IMP-BUS-Protocol II
8 Data Bits, 2 Stop Bits, Odd Parity
Storage Temperature
Operating Temperature
Charging Temperature
Charging Voltage
Charging Current
Charging Time
Accumulator
Physical BUS
Bus-Protocol
IMP-Bus Port Settings

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6 Handling of the TRIME-PICO Probes
6.1 Introduction
The determination of the soil moisture content with the Time Domain Reectometry (TDR)
technology has in the mean time managed to well-establish itself on the market. In former
times, the reliable measurement of the moisture was laborious and not always accurate. Since
the development of the TRIME-TDR technology, there no longer any reason to rely on
complicated and inaccurate technologies.
6.2 Measurement Volume of the PICO Probes
The penetration depth of the electrical and magnetic ux lines in theory reach indenitely far
into the measured material. However, the effective
penetration depth of the PICO probes relevant for the measurement is
approximately 2cm in the vicinity of the probe rods. The illustration
demonstrates the effectively registered measurement volume.
For this reason, it is important to completely insert the probe rods in the material intended for
measurement.

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HD2 – Mobile Moisture Meter
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6.3 Measurement of laboratory samples in the bucket
A sample of material can also make easy in a plastic bucket. Due to the measurement eld ex-
pansion (green waves in the gure) is a bucket with 10 liters as below to select. Thus the insertion
of the probe enough space is available to the bucket, the bucket should have a suitable height.
We recommend a plastic bucket with a diameter of 30cm and a height of 30cm. Please note the
following:
1. The bucket should be lled at least 5 cm higher than the probe rods are long (<20cm),so that
the probe be pressed in the material.
2. Insert the probe rods straight in the middle of the bucket into the material. It is important to
make sure that is not wobbled to produce no air gaps between the bars.
3. Insert the probe so far into the material that the blue probe body is in the material.
4. To avoid air gaps stomp the bucket a few times on the ground to compress the sand around
the probe rods.
5. After completion of the measurement, you can still carry out further measurements. To obtain
a representative measurement, the sand is again agitate well.

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HD2 – Mobile Moisture Meter
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7 Exchange of the Probe Rods
In the event that the probe rods are damaged, the same can be easily exchanged.
1) Prepare the gaskets, the probe body,
and the probe rods
2) Press the gaskets into the bore holes
3) Press the gaskets until they reach the
interior thread
4) Screw the rods into the probe body

Operating Instructions
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HD2 – Mobile Moisture Meter
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8 Technical Data TRIME-PICO probes
8.1 TRIME-PICO64
For measurement of the moisture content
in soil, sand, and gravel
• State-of-the-art sensor with
integrated TDR- electronics
• Measurement Value Range
0..100 vol.%
• Integrated Temperature Sensor
• Deployable up to more than
20dS/m Total Conductivity
(Bulk-Soil-Conductivity).
• Measurement Volume ≙ 1250ml
• Robust (IP68), proven, and suited for
long-term in- stallation
8.2 TRIME-PICO32
For measurement of the moisture content
in soil, sand, and gravel
• State-of-the-art sensor with
integrated TDR- electronics
• Measurement Value Range
0..100 vol.%
• Integrated Temperature Sensor
• Deployable up to more than
20dS/m Total Conductivity
(Bulk-Soil-Conductivity).
• Measurement Volume 250ml
• Robust (IP68), proven, and suited for
long-term in- stallation

Operating Instructions
Van Walt Ltd | Prestwick Lane | Grayswood | Haslemere | Surrey | GU27 2DU | Tel. [phone] | Fax. [phone] | www.vanwalt.com
HD2 – Mobile Moisture Meter
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