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Yara N-Tester, Instruction Manual

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Yara N-Tester Instruction Manual Download Page 6

 

6 

 

Issue: 03.2013 (EN) 

Description 

Mode of function 

The chlorophyll concentration in leaves is measured using 
the N-Tester. The mean of 30 individual measurements is 
displayed after successful application. The youngest fully 
developed leaf is illuminated in two wavelength ranges 
using light that is absorbed in different intensities by the 
chlorophyll. The remaining transmitted light is captured in a 
photodiode and converted to a measuring value.  

A minimum of 30 individual measurements is required to 
provide a representative reading. Individual values that 
deviate considerably (faulty measurements) are not 
considered. 

Scope of supply 

▪

 

N-Tester 

▪

 

Hand strap (for the eyelet on the N-Tester) 

▪

 

Batteries 

▪

 

Calibration disc 

▪

 

Belt bag 

▪

 

USB cable 

▪

 

Transport box 

Summary of Contents for N-Tester

Page 1: ...N Tester Instruction manual ...

Page 2: ...current state of knowledge and is no claim for completeness The application rates that are recommended using this device are non binding and do not form a contractual relationship between the receiver and Yara Warranty or liability for correctness of the fertilizer recommendation is exempted in individual cases as the location and the cultivation conditions may be substantially different The infor...

Page 3: ... 8 Operation and application 10 Starting up 10 Requirements for reliable measurements 10 Carry out measurements 11 Internal calibration 12 Action 12 Field 13 N Tester reading 15 History 16 System functions 17 Setting the language 17 Maintenance and servicing 18 Calibration 18 Resetting the N Tester to factory defaults 20 Updating the N Tester software 21 Replacing the batteries 22 Cleaning 22 Tran...

Page 4: ...ssary costs Correct use The chlorophyll concentration in leaves is measured as the mean of 30 individual measurements The following points must be observed in order to use the device in a correct manner Requirements for reliable measurements from page 10 Adherence to the service and maintenance instructions from page 188 The device can be used during light rain The device must never be completely ...

Page 5: ...Exclusion of warranty The manufacturer is not liable for the following damages to the device damage to the device following impacts or vibration damage to the device resulting from penetrating moisture damage to the display resulting from pressure application and scratches malfunctions due to damage to the measuring head and scratches etc in the sample slot malfunctions from cleaning the sample sl...

Page 6: ...nges using light that is absorbed in different intensities by the chlorophyll The remaining transmitted light is captured in a photodiode and converted to a measuring value A minimum of 30 individual measurements is required to provide a representative reading Individual values that deviate considerably faulty measurements are not considered Scope of supply N Tester Hand strap for the eyelet on th...

Page 7: ... 1 5 V alkaline manganese Service life of a battery approx 20 000 measurements Dimensions 164 x 78 x 49 mm Weight without batteries 200 g Degree of protection against water EN 60529 Category 4 The device may be used when it is raining but must never be cleaned under running water Operating conditions The N Tester is suitable for the following operating conditions 0 to 50 C Relative humidity 85 at ...

Page 8: ... Overview of the device 1 Measuring head 2 Finger rest 3 Power switch 4 ESC Cancel return to the previous display 5 Enter button Confirm selection 6 USB connection cap 7 Hand strap 8 Battery chamber cover 9 Strap eyelet ...

Page 9: ... up or to the left 12 Calibration disc 13 LCD panel Displays data and other information 14 Sliding depth stop In order to allow the leaf to be measured with the same distance to the leaf edge each time Can be adjusted or removed when required 15 Sample slot 16 Center line Indicates the center of the measuring area ...

Page 10: ...l properties such as sand banks or similar Measuring point The measurement must be carried out in the middle of the leaf blade of the youngest fully developed leaf Measurements on not fully developed leaves may lead to increased recommendations Example BBCH 32 Measuring point at stage Stem elongation node 2 at least 2 cm above node 1 Example BBCH 47 Measuring point at stage Booting flag leaf sheat...

Page 11: ...ation in the leaves and to wrong N Tester readings Therefore avoid measuring plants that suffer from visible drought stress e g leaves rolled together The following factors do not have an effect on the N Tester reading Time of the day when measuring Pesticides Moisture on the leaf The use of strobilurins Yield level Carry out measurements Each measurement comprises the following steps Calibrate in...

Page 12: ...ut 2s An internal calibration is necessary each time the device is switched on No leaf must be inserted The calibration was successful when a single beep can be heard Calibration is faulty Turn off the device If three consecutive beeps can be heard the calibration was not successful You may have opened the measuring head too early or you have not pressed them together completely Switch the device ...

Page 13: ...mple slot in the measuring head must be kept clean during the whole series of measurements Intensive solar radiation can influence the result Hold the N Tester so that it is covered by the shadow of your body Avoid using grained or thick points on the leaf Hold the N Tester on the first plant and place the leaf blade of the youngest fully developed leaf in the measuring head Take samples on 30 you...

Page 14: ...ed a little to adapt to the width of the leaf 1 of 30 valid measurements Press the measuring head together until a beep can be heard 23 of 30 valid measurements Measure more leaves distributed equally across the field The current number of successful measurements is displayed Please repeat the measurement Unsuccessful measurements will be indicated by several consecutive beeps ...

Page 15: ... order to cancel deletion you can press again or select continue and confirm with 22 of 30 valid measurements The last sample has been deleted Delete an entire series Delete last sample entire series continue If you delete the entire series you will return to the start of the measurement and all readings taken so far will be dismissed N Tester reading N Tester 649 The average N Tester reading from...

Page 16: ...you can take a new measurement To go back select Back If you don t want to make a new measurement first select New measurement then press When you are back in Action the display has changed History Action Measurement History Settings You can select History this point appears after you have done measurements using or and press Series 2 5 ABC _ 333 Now you see how many series of measurements you hav...

Page 17: ...gs using or and press Settings Device test Language Select Language Press To return to the main program without selection Press Language English Deutsch Italiano Select your preferred language by pressing or Press to make your decision The language is changed immediately Once you have confirmed the selection you will return to Settings ...

Page 18: ... the calibration disc to the front A special calibration disc belongs to every device The serial number of the device 1 and the serial number of the calibration disc 2 must correspond with each other Action Measurement History Settings From within the Action menu select Settings using or and press Settings Device test Language Select Device test Press Return to the main program without selection P...

Page 19: ...ed with the value 3 on the rear of the calibration disc The deviation must be no greater than the maximum deviation indicated on the disc 4 Calib value 63 4 Note If the value measured does not lie within the specified tolerance range a reliable fertilizing recommendation is not possible In such cases please contact YARA directly see the reverse of this manual ...

Page 20: ...evice on again CLEAR PSA PPA Device settings have been reset to defaults Now all settings have been reset to factory defaults You must switch the device off to do a new measurement Settings have been reset to their default values When you start it again it informs you that it was reset then the normal program appears You can now start new measurements and settings ...

Page 21: ... You require a PC with internet access for updating First switch on the N Tester Then connect the N Tester to the PC with the USB cable USB CONNECTED Improper use may damage device permanently The following note appears USB connected Improper use may damage device permanently Download the software from your local Yara homepage and follow the steps described there ...

Page 22: ...measuring function damage to the measuring technology Never use running water or chemical cleaning agents in the sample slot e g domestic cleaner alcohol or cleaning solvent If required clean the sample slot with a dry clean and soft cloth If required the housing can be cleaned using a dry or lightly moistened cloth Transport and storage When transporting the N Tester avoid knocking and scratching...

Page 23: ... C 85 relative air humidity up to 35 C without condensation no direct solar radiation Disposal The device and batteries may not be disposed of in normal domestic rubbish Note the separate enclosed packing for the disposal of the device and batteries ...

Page 24: ...tablished with the PC although the USB cable is connected Incorrect sequence when connecting First switch in the N Tester and then insert the USB cable in the PC INTERRUPTED Device startup was cancelled by pushing CANCEL You have accidentally pressed when switching on Switch the N Tester off and then back on INTERRUPTED Device info was sent to serial port You have accidentally pressed when switchi...

Page 25: ...Issue 03 2013 EN 25 Notes ...

Page 26: ...Issue 03 2013 EN Notes 26 ...

Page 27: ...Issue 03 2013 EN Notes 27 ...

Page 28: ...Contact YARA GmbH Co KG Hanninghof 35 48249 Dülmen Germany Tel 02594 798 0 Fax 02594 798455 ...

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