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Summary of Contents for UGT Full Range Tensiometer
- Page 1 Operating Manual Full Range Tensiometer Version: 20/07/20 Umwelt-Geräte-Technik GmbH Eberswalder Str. 58 | D-15374 Müncheberg phone: +49 (0) 33 43 2 - 89 575 | fax: +49 (0) 33 43 2 - 89 573 e-Mail: info@ugt-online.de | www.ugt-online.de...
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Page 2: Table Of Contents
2.5. Technical data ........................10 3. Structure and basic functions ......................11 3.1. structure ..........................11 3.2. How to Operate the Full Range Tensiometer? ..............12 4. Installation of the Full Range Tensiometer ..................13 4.1. Preparation and Storage ...................... 13 4.2. -
Page 3: Introduction
1. Introduction Thank you for choosing the Full Range Tensiometer. This manual can help you understand the Full Range Tensiometer features. Full Range Tensiometer by UGT covers the complete range of soil water tension relevant for plants, that can reach up to 1500 kPa (pF 4.2) depending on the FRT version. Unlike other systems used for this measuring range the Full Range Tensiometer doesn't determine the pressure head indirectly as a derived variable, but via a direct pressure measurement. - Page 4 There are several ways to contact UGT if you need a quote or product information please contact Email: info@ugt-online.de For any technical assistance or feedback or in case of problems with your product please contact Email: support@ugt-online.de We look forward to your inquiries or questions and are with pleasure at your disposal.
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Page 5: Safety Instructions
To remove or insert the tensiometer from or into the protective case turn the tensiometer only to the right. Use only clockwise rotations Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 5 of 29... -
Page 6: Scope Of Delivery And Optional Accessories
1.2. Scope of Delivery and optional accessories Basic Optional equipment • • Cable for power supply and data Full Range Tensiometer • Protective case transfer, inclusive M12 connector (standard length: 5 m, customizable) • Installation auger • Standpipe (length customizable) •... -
Page 7: General Information
PWP = permanent wilting point FC = field capacity figure 2 Exemplary retention curves of different soil types Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 7 of 29... -
Page 8: What Are Tensiometers Used For
In case of the Full Range Tensiometer the measurement volume is filled with water that is bonded to a polymer. figure 3 Schematic representation of the functional principle of a Full Range Tensiometer Umwelt-Geräte-Technik GmbH | Eberswalder Str. - Page 9 Due to the bonding of water to the polymer the physical measurement limit of approximately 1 bar does not account for the Full Range Tensiometer. The Full Range Tensiometer cannot run dry like water filled tensiometers and is able to measure soil tensions up to 5 or 15 bar, respectively. For soil tensions out of the measurement range the Full Range Tensiometer simply does not function properly.
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Page 10: Product Versions
2.4. Product versions • Digital signal output: RS485 version 1: • Measurement range tension: -100 - + 500 kPa Full Range Tensiometer FRT 5D (pF 3.7) • Digital signal output: RS485 version 2: Full Range Tensiometer FRT • Measurement range tension: -100 - + 1500 kPa (pF 4.2) -
Page 11: Structure And Basic Functions
Connector M12 sensor plug 4-terminal Plastic case (optional with thread for standpipe) Stainless steel shaft Ceramic cup Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 11 of 29... -
Page 12: How To Operate The Full Range Tensiometer
The parameters C and P are determined and preset by UGT prior to delivery. Since they are unique to each sensor, the parameters are noted in the calibration certificate. Due to aging of the polymer P might be subjected to drift and should be calibrated regularly (see chapter 6). In individual cases, it might be also necessary to re-calibrate the temperature coefficients C . -
Page 13: Installation Of The Full Range Tensiometer
Correct (left) and incorrect (center and right) positioning of the Full Range Tensiometer in a temperature-controlled water bath. Storage If the tensiometers are not installed store them in a dry state with the ceramic cup exposed to the open air at temperatures between +1°C and +39°C to ensure lasting functionality. -
Page 14: Installation Of The Full Range Tensiometer
4.2. Installation of the Full Range Tensiometer Step 1 Connecting the FRT to a power and data transfer cable Be careful to not touch the ceramic cup with bare fingers during installation. Connect the tensiometer cable to the connector of the tensiometer and screw the cap hand tight. - Page 15 Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 15 of 29...
- Page 16 Tensiometer. Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 16 of 29...
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Page 17: Interface And Power Supply
• The remaining two pins are the differential lines of the RS485 interface Pin color Output Signal Type brown 5-12 V DC white RS485 green RS485 yellow Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 17 of 29... - Page 18 (example UGTlogger DL-2000). The Pin assignment can be found in the calibration certificate. bus addresses are addressed during the setup process by UGT and can be found in the calibration certificate. Download the UGT-LOG software to your PC. Follow provided...
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Page 19: Data Transfer
5. Data transfer A RS485-Interface is required to connect the Full Range Tensiometer to the UGT Data logger or any other device with a digital interface. The following chapters describe the communication between the Full Range Tensiometer and the data logger. - Page 20 Example: Addresses and channel numbers for three Full Range Tensiometer: measurement channel bus address (preset but assignment (unchangeable) changeable) see calibration certificate or EXAMPLE FRT Log 1 = service/ calibration 2 = temperature 1 = temperature FRT 1 3 = pressure...
- Page 21 The data is transmitted in the form of ASCII - coded characters. The control character 0x0D (or CR, \r) shows the end of the line and varies depending on the software/hardware that is used. Every physical value (pressure, temperature …) recorded by the Full Range Tensiometer is readable via an own address.
- Page 22 Sensor OK\r GAD2\r 100\r 2 “temperature” → (Example: FRT 3; measurement channel bus address 100.) Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 22 of 29...
- Page 23 2 “temperature”; Change the bus address measurement channel 2 “temperature” to bus address 200) Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 23 of 29...
- Page 24 100ms answer measurement variable e.g. Serial port (OK\013) value example “pressure” “pressure” value, digital signal Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 24 of 29...
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Page 25: Transformation Digital Signal In Measurement Value
The measurement range of the temperature sensor installed in the Full Range Tensiometer is limited to -40 °C to +60 °C. However, the digital version of the Full Range Tensiometer is able to display temperature values between - 327.68 °C and +327.67 °C with a step size of 0.01 °C. The temperature value is obtained from the digital number by the following equation: ������.������������... - Page 26 The conversion into the measured soil tension has to be done by using equations 1 and 2 (see chapter 3.2. or calibration certificate). Umwelt-Geräte-Technik GmbH | Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 | www.ugt-online.de Page 26 of 29...
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Page 27: Maintenance
UGT. The Full Range Tensiometer can be used for pH values between 2 and 10. Extreme acid or alkaline conditions lead to a damage of the tensiometer. If the tensiometer was used within the range limits (pH 2 –... -
Page 28: Rezero Of The Full Range Tensiometer
6.1. Rezero of the Full Range Tensiometer The Full Range Tensiometer is factory calibrated that the measured tension equals 0 kPa at a water temperature of 20 °C when the ceramic cup is saturated and placed on the free water surface (please see calibration certificate). - Page 29 ������ �������������� Further, a simplified calibration with a parallel conventional tensiometer at the measurement site is possible. For this the offset between the Full Range Tensiometer and the conventional tensiometer is determined and subtracted from the reference pressure. Note: won’t be saved on the FRT itself.
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