Schaller HGT User manual

78,0°F | 6,16% | 456kg/m
3
| -27,3td | 0,64aw | 51,9%r.H. | 14,8%abs | 100,4g/m
2
| 09m/s | 4,90Ugl | 1
Operating Manual
Always read this operating manual before using the HGT!
HGT Wood chips moisture transmitter
for measuring the moisture content of wood chips
Moisture meter
Version 5.3

HGT Operating Manual
Page 2
Your HGT device at a glance
The main unit
No. Name
1 Sensor block
2 Sensor surface
3 Connecting cable
4 Aluminium housing for electronics
3
4
1
2

Page 3
Table of contents
Your HGT device at a glance ������������������������������������������������������������������������� 2
The main unit ..................................................................................................................2
1� Introduction ����������������������������������������������������������������������������������� 5
1.1 Information about this operating manual .......................................................5
1.2 Limitation of liability .......................................................................................5
1.3 Symbols used in this manual ..........................................................................6
1.4 Customer service ...........................................................................................6
2� For your safety ������������������������������������������������������������������������������ 7
2.1 Proper use .....................................................................................................7
2.2 Improper use .................................................................................................7
2.3 User qualications ..........................................................................................7
2.4 General safety information .............................................................................7
2.5 Warranty .......................................................................................................8
3� On receipt of your device ������������������������������������������������������������� 8
3.1 Taking the device out of its packaging ............................................................8
3.2 Making sure that all of the components have been included ..........................8
3.2.1 Scope of supply .............................................................................................8
4� Installation of the wood chips moisture transmitter ����������������� 9
4.1 Laying of the supply line or transmission line ..................................................9
4.2 Mounting the sensor ......................................................................................9
4.3 Pin assignment .............................................................................................10
4.4 Wiring diagram ............................................................................................11
5� Technical drawing HGT ��������������������������������������������������������������� 11
6� Product types ������������������������������������������������������������������������������� 12
6.1 Denition wood chip types (in accordance with EN ISO 17225-1) .................12
6.2 Selection of calibration curve for wood chips ...............................................12
6.2.1 Wood chips .................................................................................................13
6.2.2 Coarse wood chips ......................................................................................13
6.2.3 Industrial wood chips ...................................................................................13
6.2.4 Fine wood chips ...........................................................................................13
6.3 How moisture content is dened .................................................................18
7� Interpolation point tables for a control system ������������������������ 18
7.1 Interpolation point table coarse wood chips: ................................................18

HGT Operating Manual
Page 4
7.2 Interpolation point table industrial wood chips: ............................................19
7.3 Interpolation point table ne wood chips: ....................................................19
8� Cleaning and maintenance ��������������������������������������������������������� 20
8.1 Care instructions ..........................................................................................20
8.2 Cleaning the device .....................................................................................20
9� Faults �������������������������������������������������������������������������������������������� 20
10� Storage and disposal ������������������������������������������������������������������� 21
10.1 Storing the device ........................................................................................21
10.2 Disposing of the device ................................................................................21
11� Device information ���������������������������������������������������������������������� 22
11.1 EC declaration of conformity ........................................................................22
11.2 Technical data ..............................................................................................26
12� Notes �������������������������������������������������������������������������������������������� 27

Page 5
1. Introduction
1.1 Information about this operating manual
This operating manual is designed to enable you to use the HGT safely and effectively.
It is part of the device, has to be stored nearby and must be easily accessible to users
at all times.
All users are required to carefully read and make sure that they have understood this
operating manual before using the HGT. All of the safety and operating instructions
detailed in this manual have to be observed to ensure the safety of the device.
1.2 Limitation of liability
All of the information and instructions provided in this operating manual have been
compiled on the basis of the current standards and regulations, the state of the art,
and the extensive expertise and experience of Schaller Messtechnik GmbH.
Schaller Messtechnik GmbH does not accept any liability for damage associated with
the following, which also voids the warranty:
• Non-observance of this operating manual
• Improper use
• Inadequately qualified users
• Unauthorised modifications
• Technical changes
• Use of unapproved spare parts
This fast measuring procedure can be affected by a range of different factors. For this
reason, we recommend periodically checking the device’s measurements with a stan-
dardised oven-drying method.
We, as the manufacturer, do not accept any liability for any incorrect measurements
and associated consequential damage.

HGT Operating Manual
Page 6
1.3 Symbols used in this manual
All of the safety information provided in this manual is shown with a corresponding
symbol.
ATTENTION
It is essential to observe this warning. Non-compliance can lead to damage to
property or equipment.
iInformation
This symbol indicates important information that enables users to use the de-
vice more efficiently and cost-effectively.
1.4 Customer service
For technical advice, please contact our customer service department at:
Schaller Messtechnik GmbH
Max-Schaller-Straße 99
A - 8181 St.Ruprecht an der Raab
Telephone: [phone]
Fax: [phone] - 901
E-mail: [e-mail]
Internet: www.humimeter.com
© Schaller Messtechnik GmbH 2022

Page 7
2. For your safety
The device complies with the following European directives:
• Restriction of Hazardous Substances in Electrical and Electronic Equipment
(RoHS)
• Electromagnetic compatibility (EMC)
The device corresponds to state-of-the-art technology. However, it is still associated
with a number of residual hazards.
These hazards can be avoided through strict observance of our safety information.
2.1 Proper use
• Online measurement of the water content (optionally water content and tem-
perature) of wood chips by installation of a sensor in the material flow
• Fully calibrated system with calculation of the measuring value by the transmitter
unit
2.2 Improper use
• The device must not be used in ATEX.
2.3 User qualifications
The device must only be operated by people who can be expected to reliably take the
measurements. The device must not be operated by people whose reaction times may
be slowed due to, e.g. the use of drugs, alcohol or medication.
All persons using this device must have read, understood and follow the instructions
provided in the operating manual.
2.4 General safety information
The following safety information has to be observed at all times to avoid damage to
objects and injury to people:
• In case of damages or loose parts on the device, contact Schaller Messtechnik
GmbH or your dealer.
All of the device’s technical features have been inspected and tested before delivery.
Every device has a serial number. Do not remove the tag with the serial number.

HGT Operating Manual
Page 8
2.5 Warranty
The warranty does not apply to:
• Damage resulting from non-observance of the operating manual
• Damage resulting from third-party interventions
• Products that have been used improperly or modified without authorisation
• Products with missing or damaged warranty seals
• Damage resulting from force majeure, natural disasters, etc.
• Damage from improper cleaning
3. On receipt of your device
3.1 Taking the device out of its packaging
• Take the device out of its packaging.
• Next, make sure that it is not damaged and that no parts are missing.
3.2 Making sure that all of the components have been included
Make sure that all of the components have been included by checking the package
contents against the following list:
3.2.1 Scope of supply
• HGT
• Connecting cable of 1.9 m length
• Operating manual
Optional accessories:
• Analogue output for temperature measurement (-10 °C to +70 °C)
• Display with keyboard in the housing for HGT
• Test block

Page 9
4. Installation of the wood chips moisture transmitter
4.1 Laying of the supply line or transmission line
• The cable must not be laid in the area of interference fields.
• Do not operate the transmitter in the area of electromagnetic interference
fields.
• The cable must not be bent excessively.
• The permissible cross-sections for the installation must be observed.
• The cable length must be kept as short as possible.
»If an extension of the cable is required, the cross-section of the extension must
not be below 0.25mm2.
4.2 Mounting the sensor
• During the measurement a continuous contact between the stainless metal sen-
sor surfaces and the material being measured has to be ensured.
• For a correct measurement result, the product must exert a pressure of at least
20N/dm2onto the sensor surfaces.
• There must be no contact of any conductive materials with the sensor surfaces.
• Mount the sensor on the four drilled holes (ø9.0 mm) in the sensor block.
Possible mounting locations:
• Screw conveyor
»Installation at the bottom of the trough
• In-feed chute with hydraulic ram
»Installation at the side wall
• Bunker
»Installation at the side wall (to ensure the minimum pressure, the sensor possibly
has to be mounted at an angle)
Note for installation after the dryer:
After the drying process the material surface is much dryer than its core. Therefore an
installation directly after the dryer will lead to too low measuring values. The specified
minimum measuring range of 10% water content (for wood chips) will not be possible,
in fact the measuring range limit is higher.

HGT Operating Manual
Page 10
4.3 Pin assignment
Cable color Pin no. Function
Brown 1 Power supply V- (0 VDC)
Ground current output
White 2 Power supply V+ (24 VDC)
Blue 3 Analogue output humidity 4 - 20 mA
Black 4 n.c.
Grey 5 Analogue output temperature 4 - 20 mA
(optional)
Purple Housing Equipotential bonding GND
ATTENTION
Damage to the electronics due to incorrect cable connection
Incorrectly connected cables can lead to severe damage of the electronics.
►Connect all cables correctly.

Page 11
4.4 Wiring diagram
5. Technical drawing HGT
Power supply moisture transmitter
Evaluation unit (PLC, ...)
Power supply V+ (24VDC)
Power supply V- (0VDC)
Potential equalisation GND
Analog output humidity 4-20mA
Analog output temperature 4-20mA (optional)
V+ (24VDC)
V- (0VDC)
White
Brown
Purple
Blue
Grey
A
A
1
A4
HGT Hackgut-Feuchtetransmitter
AN4033a / Art.Nr. 12199
Gezeichnet
Kontrolliert
Norm
Datum Name
25.02.2019 WolfgangSCH
Stecker
plug
Maße in mm!
Dimensions in mm!
Änderungen vorbehalten!
76,5
9,0 170,0
3,0
11,0
15,0
52,0
140,0
82,0
21,0
3,0
188,0
78,02,0

9,0

HGT Operating Manual
Page 12
6. Product types
Product type Material Measuring range
Wood chips Wood chips P31 to P45 10 % - 50 %
The system has been calibrated for standard wood chip types from P30 to P45. In
practice it may occur that the shown measuring value differs from the real value. This
means that the measured material has a different "moisture calibration curve" than the
type of material that has been used for the calibration.
6.1 Definition wood chip types (in accordance with EN ISO 17225-1)
The given numbers refer to the particle sizes that fit through the round screen openings.
• P16 at least 75 % of the mass between 3.15 and 16 mm
• P31 at least 75 % of the mass between 8 and 31.5 mm
• P45 at least 75 % of the mass between 8 and 45 mm
• P63 at least 75 % of the mass between 8 and 63 mm
6.2 Selection of calibration curve for wood chips
The calibration curves for wood chips depends on the wood type (hardwood, soft-
wood), the size of the chips (size classes according to norm EN ISO 17225-1) as well as
on the content of fine fraction.
If you are not sure which calibration curve is the best suited for your material, it is
recommended to carry out a reference measurement by kiln-drying (according to EN
ISO 18134-2).
Schaller Messtechnik GmbH will be happy to advise you on the selection of the right
calibration curve. Please send a picture of your wood chips, placing a measuring tape
to the material, to [email protected]. You will receive a recommendation from
us immediately.

Page 13
6.2.1 Wood chips
For wood chips with fine fraction, mainly consisting of hardwood (maximum propor-
tion of softwood of 30 %). For wood chips sizes from P31 to P45. The fine fraction
mainly derives from barks, small branches and bushes. See example pictures 1and 2.
If your wood chips don´t contain small parts (few fine fraction or no fine fraction) or
if the wood chips contain a higher proportion of softwood, use one of the following
calibration curves.
6.2.2 Coarse wood chips
For coarse wood chips without fine fraction, mainly consisting of hardwood (maximum
proportion of softwood of 30 %). This curve also has to be used for wood chips with
fine fraction, mainly consisting of softwood, with a proportion of softwood (spruce,
fir, pine, larch) of 70 % and more. For wood chips sizes from P31 to P63. See example
pictures 3and 4.
If your wood chips mainly consist of softwood and don´t contain small parts (few fine
fraction or no fine fraction), use the following calibration curve.
6.2.3 Industrial wood chips
For coarse wood chips without fine fraction, mainly consisting of softwood, with a pro-
portion of softwood (spruce, fir, pine, larch) of 70 % and more. For wood chips sizes
from P45 to P63. This curve is predominantly suited for measuring wood chips deriving
from logs and full trees as well as sawmill residues without fine fraction. See example
pictures 5and 6.
6.2.4 Fine wood chips
For fine wood chips with a high proportion of fine fraction, consisting of at least
one third hardwood. The fine fraction mainly derives from barks, small branches and
bushes. For wood chips size P16. See example picture 7and 8.

HGT Operating Manual
Page 14
Example pictures wood chips
1
2

Page 15
Example pictures coarse wood chips
3
4

HGT Operating Manual
Page 16
Example pictures industrial wood chips
5
6

Page 17
Example pictures fine wood chips
7
8

HGT Operating Manual
Page 18
6.3 How moisture content is defined
The device measures and shows the material’s moisture content. The moisture content
readings it displays are calculated in relation to the material’s overall mass:
Mn: Mass of the sample with average moisture content
Mt: Mass of the sample with zero moisture content
%WG: Moisture content (in accordance with EN ISO 18134-2)
7. Interpolation point tables for a control system
For the measurement of coarse, industrial or fine wood chips, in the programming of
the control system a special calibration curve has to be entered. This is done by using
so-called interpolation point tables. The needed calibration curves are simulated by
fixed points. The interpolation between the fixed points is straight.
The water content of the transmitter is used as the input value for the calculation of
the interpolation point table. This is the value for standard wood chips and corre-
sponds to the 4 to 20 mA and 0 to 80% water content.
7.1 Interpolation point table coarse wood chips:
Interpolation
point
Analog output
[mA] (X value)
Wood chips
[%WC] (X value)
Coarse wood chips
[%WC] (Y value)
0 4.00 0.0 0.0
1 5.20 6.0 6.0
2 5.80 9.0 9.0
3 7.20 16.0 16.0
4 8.70 23.5 24.9
5 10.40 32.0 37.2
6 11.20 36.0 43.0
7 12.16 40.8 50.0
8 14.10 50.5 55.0
9 20.00 80.0 55.0

Page 19
7.2 Interpolation point table industrial wood chips:
Interpolation
point
Analog output
[mA] (X value)
Wood chips
[%WC] (X value)
Industrial wood chips
[%WC] (Y value)
0 4.00 0.0 0.0
1 5.20 6.0 6.0
2 5.80 9.0 9.0
3 7.20 16.0 16.0
4 8.70 23.5 26,3
5 10.40 32.0 42.3
6 11.20 36.0 50.0
7 13.24 46.2 55.0
8 17.00 65.0 55.0
9 20.00 80.0 55.0
7.3 Interpolation point table fine wood chips:
Interpolation
point
Analog output
[mA] (X value)
Wood chips
[%WC] (X value)
Fine wood chips
[%WC] (Y value)
0 4.00 0.0 0.0
1 5.20 6.0 6.0
2 5.80 9.0 9.0
3 7.20 16.0 16.0
4 8.70 23.5 22.8
5 10.40 32.0 29.4
6 11.20 36.0 32.5
7 14.00 50.0 43.5
8 14.56 52.8 50.0
9 20.00 80.0 55.0

HGT Operating Manual
Page 20
8. Cleaning and maintenance
Regularly cleaning and maintaining the device will ensure that it will have a long service
life and stay in good condition.
8.1 Care instructions
• Do not immerse the sensor in water.
• Do not expose the device to extreme temperatures.
• Do not bend the sensor cable excessively. Repeated bending of the sensor cable
can lead to damage to the electronics of the sensor.
• Protect the device from strong mechanical shocks and loads.
8.2 Cleaning the device
Sensor surfaces
Clean the sensor plates with a cloth and cleaning alcohol.
9. Faults
If the measures listed below fail to remedy any faults or if the device has faults not
listed here, please contact Schaller Messtechnik GmbH.
Fault Cause Remedy
Measuring error The temperature of the ma-
terial being measured is too
low or high. I.e. the material’s
temperature is lower than +5
°C or higher than +40 °C.
The temperature of the
material being measured
has to be between +5 °C
and +40 °C.
Frozen material or material
mixed with snow
Accuracy decreases signifi-
cantly
The material must not be
frozen or mixed with snow.
Measurement error due to too
short temperature adjustment
time
Let the device adjust to the
surroundings.
Mouldy or rain wet material
Accuracy decreases signifi-
cantly
Only measure dry, not
mouldy material.