UNISENSE Mini Скачать руководство пользователя страница 21

Page 21 

 

 

As the STOX sensors have a built-in zeroing it is only necessary to do a one-point calibration, 
but it may be reassuring also to do a zero calibration in an ascorbate solution.  
 
The signal for oxygen concentration is the difference between sensor signal with the front 
guard polarized and unpolarized - 

the ∆

-signal. Calibration of the STOX sensor should not be 

performed using the calibration function in Logger, instead it is recommended to record 
uncalibrated data and to do the calibration in a spreadsheet.  
 

  

If you are measuring low O

2

 concentrations with the STOX sensor it is best to calibrate in 

that range and not at atmospheric saturation as you would normally do with O

2

 sensors. 

This may be done by injecting a known small volume of air saturated water into a larger 
known volume of water with low O

2

 concentration while recording the STOX sensor signal.  

 
The STOX sensor is sensitive to temperature and calibration should be done at the same 
temperature as the measurements. If temperature varies during the deployment the 
calibration should be done at both the highest and lowest encountered temperature. It may 
then be assumed that sensitivity varies linearly between the two temperatures.  
 
The O

2

 concentration in air saturated water at a given temperature and salinity may be 

calculated with the O

2

-calculator tool in the Logger software: 

Tools - O

2

 calculator

.  

 
Example:  
Procedure: 

 

300 ml of N

2

 bubbled water is transferred to a conical flask. The STOX sensor is 

placed in the water and at least two full polarization - depolarization cycles are 
recorded 

 

3.0 ml air saturated water is added to the conical flask and gently mixed. At least two 
full polarization - depolarization cycles are recorded  

 

The amendment of air saturated water may be repeated to obtain several estimates 
of the sensitivity 

 

This procedure may at best be performed before deployment and with the FDL Mini 
online with the Logger sof

tware to see the response of the ∆

-signal to the O

2

 

Содержание Mini

Страница 1: ...Field Datalogger Mini Manual Field Datalogger Mini October 2018 docx...

Страница 2: ...l features 10 6 1 Operating principles 10 6 1 1 The Always on principle 10 6 1 2 File creation 10 6 1 3 Download of data 10 6 1 4 Data calibration 10 6 2 Support for STOX sensors 10 6 3 Sensor connect...

Страница 3: ...with built in amplifier 17 7 4 2 Channel with external in situ amplifier 17 7 5 Downloading data to PC 17 7 5 1 File size and download time 18 7 6 Calibration 18 7 6 1 Calibration of the sensors 18 7...

Страница 4: ...se or the inability to use this product 1 3 Repair or adjustment Equipment that is not covered by the warranty will if possible be repaired by Unisense A S with appropriate charges paid by the custome...

Страница 5: ...fy reverse engineer disassemble or de compile all or any part of the software or rent lease distribute or sell the software The Customer shall however be entitled to make one copy of the software for...

Страница 6: ...dditional products or if you encounter any problems and need scientific technical assistance please do not hesitate to contact our sales and support team We will respond to your inquiry within one wor...

Страница 7: ...ation of the front guard is collected together with the signal for O2 concentration The FDL Mini may be integrated with other platforms It may be powered from a CTD or ADV or other source using a 6 28...

Страница 8: ...ini external features Two channel left and four channel right FDL Mini seen from the sensor end These dataloggers are with built in amplifiers FDL Mini with Off dongle and dummy mounted at the non sen...

Страница 9: ...13 Ah 7 4 V Deployment up to 3 months 25 C Not included to be ordered separately Unisense in situ microsensors Connectors for in situ microsensors In situ amplifiers with cable one for each channel w...

Страница 10: ...data that are already stored Therefore when data is downloaded at the end of a deployment the file will contain all data from that deployment Downloading data during a deployment can be used as a sne...

Страница 11: ...e seen in the Unisense Logger software See 7 3 4 Checking battery level and storage capacity 6 6 Computer connection The PC communication cable MDL COM001 connected to the communications bulkhead conn...

Страница 12: ...for connecting the FDL Mini with external units are ordered separately 7 WORKING WITH THE FIELD DATALOGGER MINI 7 1 Connecting the Field DataLogger Mini to a PC The FDL Mini is connected to a USB por...

Страница 13: ...rization must be set correctly and individually for each channel Wrong polarization may destroy the sensor The correct polarization for each type of sensor is found in the sensor manual Open the Senso...

Страница 14: ...create a new logging file in the FDL Mini 7 3 2 Setting sampling rate Right click one of the channels and select Device settings In the window that opens you may select the datalogging frequency for t...

Страница 15: ...he Set button to set the instrument time to the date and time displayed in the New time box Click the Synchronize button to set the instrument time to the current date and time of the connected PC NOT...

Страница 16: ...ltage range for the amplifier Select the smallest range possible to get the most out of the resolution of the amplifier matching the expected signal range of the sensors It is recommended not to selec...

Страница 17: ...housing The sensor needs to be mounted on an In Situ Connector which is then connected to the In Situ Amplifier See separate manuals for this http www unisense com manuals Note Most microsensors requi...

Страница 18: ...stored in the Logger file on the PC and not on the FDL Mini which will only store raw data After downloading a file from the FDL Mini data must be calibrated in Logger using an already stored calibra...

Страница 19: ...and are applied to the FDL Mini datafile after logging is completed Open the data file in Logger using File Open dialog Make the dataset active by double clicking the appropriate experiment name in th...

Страница 20: ...ata file into Logger Double click the relevant experiment in the Experiment overview window to the left Select the data tab name identical to the Experiment name Click the Export button Choose the fil...

Страница 21: ...sor is sensitive to temperature and calibration should be done at the same temperature as the measurements If temperature varies during the deployment the calibration should be done at both the highes...

Страница 22: ...y o See 7 3 4 Checking battery level and storage capacity For each channel set the correct polarization voltage for the sensor to be connected o See 7 3 1 Setting polarization Set the Sampling rate o...

Страница 23: ...ftware Consult the Logger part of the SensorTrace Suite manual http www unisense com manuals for details on how to log data directly on a PC Note that the delivery of data from the FDL Mini to the PC...

Страница 24: ...www unisense com info unisense com...

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