Opsytec UVpad User Manual

UVpad
Manual
Version: 1.5.8
Opsytec Dr. Gröbel GmbH
76275 Ettlingen
Tel.: 07243 / 94783 - 50
Fax: 07243 / 94 83 - 65
info@opsytec.de
1 Content 2
1 Content
1 Content................................................................................................................................. 2
2 Change history ..................................................................................................................... 3
3 Symbols Overview .............................................................................................................. 3
4 Function Overview .............................................................................................................. 5
4.1 Quick start guide ....................................................................................................... 6
5 Technical Data ..................................................................................................................... 8
5.1 General technical data ............................................................................................... 8
5.2 Radiometric measurements ....................................................................................... 8
5.3 spectral ranges ........................................................................................................... 9
USB ........................................................................................................................... 9
5.4 / hardware-software-requirements ............................................................................. 9
5.5 Effect related measurements ..................................................................................... 9
6 Intended Use ...................................................................................................................... 10
7 Conventional Use .............................................................................................................. 10
8 Important Information ....................................................................................................... 11
9 Operation ........................................................................................................................... 12
9.1 Switching the device on and off .............................................................................. 12
9.2 Standby Menu ......................................................................................................... 13
9.2.1 Start Measurement ............................................................................................... 14
9.2.2 Show last Measurement ....................................................................................... 16
9.2.3 Scope Measurement ............................................................................................. 17
9.2.4 Settings ................................................................................................................ 18
9.2.5 Information .......................................................................................................... 19
9.3 Settings .................................................................................................................... 19
9.3.1 Sensitivity ............................................................................................................ 19
9.3.2 Effective Function* ............................................................................................. 21
9.3.3 Measurement delay .............................................................................................. 21
9.3.4 Language ............................................................................................................. 22
9.3.5 Date / Time .......................................................................................................... 22
9.3.6 Factory Settings ................................................................................................... 22
10 Data Export / PC Software ................................................................................................ 23
10.1 Installation ............................................................................................................... 23
10.2 Connecting with the PC ........................................................................................... 23
10.3 Viewer Software ...................................................................................................... 24
10.4 Export of measurements .......................................................................................... 26
10.5 Displaying and comparing Measurements .............................................................. 27
10.6 Displaying the Irradiance profile ............................................................................. 27
10.7 Deleting Measurements ........................................................................................... 28
11 Notes for optimal measurement results ............................................................................. 29
11.1 The UVpad displays „MAX“ .................................................................................. 29
11.2 Set UVpad for high belt speeds ............................................................................... 29
11.3 The UVpad displays too little irradiance values ..................................................... 30
11.4 The UVpad displays too high or too low UVC Values ........................................... 30
11.5 The UVpad displays “ - ........................................................................................ 30
11.6 The measured value is not reproducible .................................................................. 31
12 Cleaning, Maintenance & Troubleshooting....................................................................... 32
12.1 Calibration ............................................................................................................... 32
12.2 Cleaning .................................................................................................................. 32
12.3 Battery Change ........................................................................................................ 33
2 Change history 3
12.4 Troubleshooting ...................................................................................................... 34
13 Declaration of Conformity ................................................................................................. 35
14 Notes .................................................................................................................................. 36
2 Change history
Date
Version
Changed by
Comment
28.03.2012
1.4.0
Paravia
first Version
22.11.2013
1.5.4
Paravia
added saturation note
08.10.2014
1.5.5
Paravia
added LowGain
02.04.2015
1.5.6
Paravia
Software version 1.1.0, Firmware 1.0.4
23.03.2017
1.5.7
Uhl
Upgrade measurement time; UVA/VIS range adjusted Quick start guide
19.02.2018
1.5.8
Paravia
Editorial modifications
3 Symbols Overview
Meaning: Failure to observe the mentioned instructions can re­sult in an injury of the user.
Meaning: Failure to observe the mentioned instructions can re­sult in a damage of the device.
Meaning: Instructions are to be observed for the regular opera­tion.
*
Optional functions, not available for every UVpad
0 4
4 Function Overview 5
4 Function Overview
In the quality control of UV-varnishes, broadband radiometers and spectral radiometers are used to monitor the lamp power and to adjust the system in an optimal way. However, broad­band radiometers are only calibrated to one lamp type and differ in their sensitivity. Thus, comparisons between the measurement instruments of different manufacturers, different lamps (Hg, Ga, I,…) or UV-LEDs are not possible. By means of spectral radiometers, all UV-sources can be measured and compared. Here, the UVpad offers enormous application advantages compared to the common spectral radiometers. Not only is the UVpad the worlds flattest autonomic spectral radiometer, it also offers a high­quality spectral measurement technology in a robust and easy to operate measurement device. The UVpad enables wireless measurements in production and conveyor systems for all UV processes. It measures the entire spectrum continuously and analyses the data in real-time. As a result, the spectral range is evaluated and illustrated conforming to standards. Hereby, compar­isons of different lamps are possible. By optionally provided photo initiator spectrums, UV processes can also be optimized related to causes and effects. The UVpad offers these func­tions/features:
Spectral measurements:
Real-time of the spectrum (scope measurement)
Radiometric measurements:
Spectrum at max irradiance Irradiance (UVA, UVB, UVC, VIS) Profile of irradiance Dose of irradiance (UVA, UVB, UVC, VIS)
Measurements related to cause and effects:
Photo initiator spectrums (optional) Sensitivity functions of broadband radiometers (optional)
Front panel
Rear panel
4 Function Overview 6
4.1 Quick start guide
This quick start guide is intended to explain the function of the UV pad by means of an operat­ing procedure.
Step 1
Turn on the UV pad with any key on the front panel. Press again to enter the main menu.
Step 2
For reproducible results, you should always select a fixed integration time.
Therefore select sensitivity to „fixed“ under settings sensitivity and set the desired time.
Step 3
To adjust the integration time press the -key or the -key.
Start with a fixed integration time of 10 ms.
Confirm your integration time with the -key and return to the main menu with the - key.
Step 4
Start a first measurement to determine the modulation of the measuring device.
Note that the optically active surface always points in the direction of the radiation source and is not covered.
0 7
Step 5
By pressing and holding the -key for ap­prox. 1 sec, the measurement will be inter­rupted and the measurement result is shown on the display.
Step 6
Above the spectrum of your radiation source you will find information on the modulation (M) and the integration time (T). For reproducible measurement results the modulation should be between 80 - 90%. The integration time should be increased below 50% (see step 3).
Hint:
For optimum measurement results, the measuring range should be fully con­trolled. Very good measuring results are achieved when the measuring range is at least 50%.
The modulation is linear to the set integration time. Example:
55/5000 T10 M20%: Measuring range is 20% used => Bad T40 M80%: Measuring range is 80% used => Very good
Step 7
Repeat the measurement until the recom­mended modulation is reached.
By using the -key or the -key, additional information such as the radiation intensity or radiation dose or the profile of irradiance for the four spectral ranges can be displayed.
Step 8
Connect the device to your PC using a Mini USB cable. With the software UVpad Viewer you can now transfer your measurements to the PC. For more information, see chapter 10 Data Export / PC-Software.
5 Technical Data 8
5 Technical Data
5.1 General technical data
Size (L x W x H)
160 x 100 x 14,4 mm³
Weight
375 g
Power
battery powered, 3 x CR2032
Max. operational temperature
70°C
Display
graphical, 128 x 64 px
Optically active surface
Diameter: 6 mm
Optically active surface position
on rear panel, 3 mm behind surface
internal memory
50 measurements with export option 1 measurement without export option
5.2 Radiometric measurements
Spectral range
200 - 440 nm
Spectral bandwidth
~ 2 nm
Irradiance measurement range
2 - 5000 mW/cm² 25 - 35000 mW/cm² (option)
Irradiance dose measurement range
1 mJ/cm² - 600 J/cm² 25 mJ/cm² - 42000 J/cm² (option)
Irradiance profile
4 spectral ranges (UVA, UVB, UVC, VIS) with export option, otherwise only „Total“
Measurement time
0 bis 120 s, adjustable to ~ (rounded) 120 s (4 Hz) 48 s (10 Hz) 24 s (20 Hz) 10 s (50 Hz) 5 s (100 Hz) 8 min (1Hz)
Time resolution
10 ms to 250 ms, adjustable
Sampling rate
10 ms - 1000 ms, automatically set storage rate for export: see time resolution
Gain
normal / LowGain for 10 to 30 ms
Cosine correction
yes
Calibration
yes, traceable to PTB / NIST
frequency of checks (Recalibration)
12 months
5 Technical Data 9
5.3 spectral ranges
The classification of the UV regions in the spectral radiometer is carried out according to CIE as follows: UVC 200 – 280 nm; UVB 280 – 315 nm; UVA 315 – 400 nm; VIS 200 – 440 nm.
according
CIE
UV-C
200 - 280 nm
UV-B
280 - 315 nm
UV-A
315 - 400 nm
VIS
400 - 440 nm
based customer specification
optional
5.4 USB / hardware-software-requirements
USB connector
MiniUSB
PC requirements
min Intel CORE i3, 2 GB Ram, >40 Gb HDD
operating system
Windows 7 with .NET Framework > 4.0
5.5 Effect related measurements
Photoinitiator / Sensitivity curve
optional
6 Intended Use 10
6 Intended Use
The UVpad determines the irradiance in the UV and VIS spectral range and indicates these on the integrated display. It can be used in UV curing systems, if the maximum operating temper­ature of 70 °C is not exceeded. For this reason, the UVpad is equipped with a thermal shield on the rear panel. The rear panel of the UVpad may be exposed to intensive UV radiation. The front panel must not be exposed to UV radiation.
7 Conventional Use
The UVpad is solely intended for the determination and visualization of irradiances, which are generated in UV curing systems.
The UVpad is battery operated and suitable for usage with lithium batteries, type CR2032. In case other batteries, than the supplied ones, are used, an operating range of up to 70 °C has to be ob­served. Spare batteries are to be obtained from your supplier.
Operation only allowed in dry environments. The assembly position is arbitrary.
When using the UVpad, light and UV radiation can be reflected and distributed at the housing. Appropriate protection measures for the protection against radiation need to be applied, if neces­sary. Note: The UVpad itself does not emit any hazardous radiation.
The housing, with the exception of the battery compartment, must not be opened by the user.
The optically active surface must not be touched.
Gloves need to be worn when cleaning the optically active surface.
The UVpad is a highly sensitive optical measurement device. It must not be exposed to shocks.
Any other usage than the one described above leads to a damage of the product. Furthermore, this involves risks, such as short-circuits, fire and electric shocks. The entire device must not be modi­fied and/or remodeled! The safety indications are to be observed without fail.
optically active surface
8 Important Information 11
8 Important Information
Please read the instruction manual completely before start-up and operation. The latest version of the instruction manual applies.
Skin oil and contamination are absorbing in the UV spectral range. Finger prints / contamination on the optically active entrance opening are to be avoided. If necessary, clean thoroughly with Isopropanol. Use gloves when cleaning.
The UVpad is calibrated.
ATTENTION: Opening of the housing (except for the battery compartment) leads to a loss of calibration.
Only use batteries, which are suitable for up to 70 °C.
The UVpad is a highly sensitive optical measurement device. It must not be ex­posed to shocks.
When using the UVpad, light and UV radiation can be reflected and distributed at the housing. Appropriate protection measures for the protection against radi- ation need to be applied, if necessary.
The maximum housing temperature can reach > 60 °C and there is the risk of skin burns on contact. Please allow for the UVpad to cool down and use pro­tective gloves to avoid skin burns.
9 Operation 12
9 Operation
The UVpad is operated via four keys. These are arranged on the front panel below the display. The keys and the functions are illustrated as follows:
Key
Function
Back / Cancel / Off
Down
Up  Confirm / Continue
The keys -key and -key are additionally available as softkeys. Softkey functions are direct­ly displayed above the key. Example:
9.1 Switching the device on and off
The UVpad is activated via any key. During the initialization (ca. 2s), the welcome screen is displayed:
After the initialization, the standby menu is displayed:
9 Operation 13
In the standby menu, the UVpad is switched off via the key -key.
After 2 minutes of not using the UVpad, the device switches off automatically.
9.2 Standby Menu
Via the standby menu, all functions of the UVpad are available for you. These are:
Start measurement Show last measurement Scope measurement Settings Information
In the standby menu and in all other menus, select the active menu item via the keys -key and -key. Confirm the active menu item with the key -key. With -key, you return to the previous menu without saving any changes.
The selected menu item is highlighted in black and displayed inverted. If several settings are selectable, then the selected setting is marked with. Example:
In this example, the language “English” is set. “German” is selected, but not set.
With the key -key, the setting is accepted and the language is being changed.
9 Operation 14
9.2.1 Start Measurement
From the standby menu, a measurement is started with the key -key.
The measurement device displays that a measurement is in progress.
Stop the measurement by pressing -key.
Turn the measurement device and position it for the measurement.
1. Start measurement 3. Measurement in progress 4. Turn measurement device
2. Turn measurement device 5. Stop measuremen t
The UV pad requires approx. 2 seconds for the automatic adjustment of the integration time. This can lead to fluctuating measuring results on belt con­veyor systems. Use a fixed Sensitivity under Setting> Sensitivity> Fixed
Stop the measurement afterwards by pressing the key -key for at least 0.5s. The measurement results are displayed automatically. For a better overview, these are parti­tioned to four screens.
1. Irradiance (UVA, UVB, UVC, VIS)
2. Dose of irradiance (UVA, UVB, UVC, VIS)
3. Spectrum at maximum irradiance
4. Irradiance profile over the duration of the measurement
These can be displayed with the keys -key or -key.
9 Operation 15
First, the spectrum is displayed.
Notes: The optimal integration time and the saturation of the measurement range are displayed at the upper display edge. The integration time is displayed in ms. Example:
T 100: The optimal integration time is 100 ms
For optimal measurement results, the measurement range has to be fully modulated. For this purpose, the UVpad has a 12-bit analogue/digital converter, which scans the spectrum continu­ously. Excellent measurement results are achieved, when the measurement range is used to at least 50%. Example:
M 70: The measurement range is used to 70% => Excellent
With the key -key, the irradiance is dis­played.
With the key -key, the dose of irradiance is displayed.
9 Operation 16
With the key -key, the profile of irradiance for UVA, UVB UVC and VIS is displayed.
With the key -key, you are respectively being redirected to the previous menu. With the keys -key or -key you can return to the standby screen.
Note: If the irradiance is too low for the measurement range, then the UVpad dis­plays no measured values. The irradiance and the dosage values are then dis­played with -.
9.2.2 Show last Measurement
In the standby menu select the item “Show last measurement” to display the last measurement. Select the values from the list of measurements, which you want to display. The navigation in the display screens is taken out, as described in chapter 9.2.1.
Select the measurement with the keys -key and -key. Confirm with -key. Return with -key.
If 50 measurements have already been saved, then a note comes up prior to a new measurement, stating that the memory is full and that the measurement can be taken out without saving it, or that alternatively, the oldest measure­ment result is being overwritten.
See Delete all Measurements See Data Export
9 Operation 17
Delete all measurements:
The internal memory can be deleted directly on the UVpad or via a PC. For this purpose, please select the prior menu item “Clear memory”.
Confirm with Yes (-key). Return with -key or -key.
9.2.3 Scope Measurement
A scope measurement is a real-time view of the spectral irradiance. In the scope measure­ments, the spectrum is displayed via the wavelength.
During the scope measurement, you can set up the sensitivity of the UVpad with the keys -key and -key. Select -key for a lower sensitivity and -key for a higher sensitivity. The sensitivity is not imported for the measurement of the irradiance.
Select a higher sensitivity (-key), if the spectrum is noisy or does not fill the display completely.
9 Operation 18
Select a lower sensitivity (-key), if single lines of the spectrum are cut on top. The measurement range is then exceeded and is shown in the display MAX.
Examples:
Sensitivity too low
Sensitivity correct
Sensitivity too high
Risk of UV radiation.
Protect your skin and eyes during the work at and with UV radiation sources.
9.2.4 Settings
In the menu „Settings“, you can set up the sensitivity, the effective function, the menu lan­guage and the date / time. Furthermore, you can reset the UVpad to the factory settings.
9 Operation 19
9.2.5 Information
Select the menu item “Information” from the standby menu, to display the serial number, the
firmware version, as well as the date of calibration.
With any key, you are being redirected to the menu.
9.3 Settings
By selecting the menu item „Settings“, you are being directed to the settings menu of the
UVpad.
In this menu, the following functions are available:
- Settings of the sensitivity
- Selection of the effective function
- Language settings
- Settings of date and time
- Reset to factory settings
9.3.1 Sensitivity
The UVpad adjusts the sensitivity automatically, in order to ensure the optimal signal-noise ratio. The sensitivity is hereby set via the sampling rate. With high irradiances, the sampling rate is increased in order to not exceed the measurement range. With low irradiances the sam­pling rate is decreased. As a result in belt conveyor systems erroneous measurements may be recorded. Please follow the instructions on the display and / or set a fixed integration time as sensitivity.
Four pre-defined sensitivities are available.
9 Operation 20
In the setting „automatically“, the UVpad
adjusts the sensitivity, once a minimum irra­diance is existent. This setting is suitable for most applications. In the setting „low“, the sampling rate is al­ways between 10 ms and 100ms. The UVpad can measure UV-systems with a very high irradiance or significant irradiance modifica­tions (e.g. with shutter operation or with very high tape speed).
In the setting „high“, the UVpad measures
with a sampling rate of 1000 ms. This is ideal for applications with a low irradiance. In the setting fixed, the integration time is predetermined. The UVpad can be used opti­mally for known systems with shutters
The menu item “Sample rate” is displayed, if you have selected a fixed sensitivity.
The integration time is set via the keys -key and -key. Confirm with -key or cancel the setting with -key.
Pressing -key on 10 ms setting switches to low sensitivity. This reduces sensitivity by factor of 5.
9 Operation 21
9.3.2 Effective Function*
Effective functions serve for the process-oriented measurement. This is often also called effect­related or actinic measurement.
In that case, effective functions can be for example:
- Absorption spectrums of photo initiators
- Spectral sensitivity function
- Filter function for instrument comparisons
In the Eff. function menu, the desired function can be selected using the -key or -key and confirmed with the -key.
Select „radiometric“, for traceable and inter­nationally comparable measurements.
Select an effective function for a process­oriented measurement and a targeted system optimization. The international comparability is not given.
If measurements are taken out effect-related, then this is displayed in the irradiance and in the dosage display by the addition “(ef)” for “effective”. Radiometric and effect-related measure­ments are illustrated subsequently.
Example: radiometric
Example: with effective function
The function “Effective Function” is only available, if your UVpad has been
programmed with a customized effective function at factory.
9.3.3 Measurement delay
Select a measurement delay in order to start a new measurement delayed.
9 Operation 22
9.3.4 Language
The UVpad comes with a menu in the German and English language.
Select the desired language with the keys -key and -key and confirm with -key.
9.3.5 Date / Time
The UVpad has a real-time clock to check the validity of the calibration. You can set up the real-time clock in the menu „Date / Time“.
First set the day with the keys -key and -key. Select -key for the month, the year, the hours and minutes.
Confirm your settings with -key.
With -key you can cancel the settings at any time.
9.3.6 Factory Settings
Reset the UVpad to the factory settings and confirm.
Confirm the restoration of the factory settings with -key.
With -key you can cancel the restoration of the factory settings.
10 Data Export / PC Software 23
10 Data Export / PC Software
10.1 Installation
For the installation, please proceed as follows:
1.) If necessary, disconnect the connection of the UVpad with the PC.
2.) Start the installation with setup.exe in the master data of the Software CD. Follow
the instructions of the installation program.
The driver installation is executed as an independent application TUSB3410.
For the software UVpad Viewer, the Microsoft .NET Framework Version 4.0 or higher is required. This is found on the installation CD or free of charge at: www.microsoft.de.
3.) After completing the installation, connect the UVpad with the PC. The UVpad is inte-
grated as a virtual, serial interface. The driver installation is taken out automatically under Windows 7.
10.2 Connecting with the PC
Connect the UVpad with the PC and switch it on. The screen displays the message “USB con- nected”.
Once the UVpad is connected with the PC, it does not react to any keystroke. Disconnect the connection with the PC and the UVpad continues working autonomously.
10 Data Export / PC Software 24
10.3 Viewer Software
The UVpad software is divided into two areas. The area measurement overview displays the executed measurements with date / time, irradiation and dosage, as well as the integration time, the saturation und the measurement duration.
Individual measurements can be compared in the display area based on spectra, irradiance pro­file or by means of measurement data.
The buttons EN and DE let you change the language (German / English).
When starting the software, the measurements are automatically imported, when an UVpad is being detected. Importing can take a few seconds. During this time, a progress bar displays the import:
If the UVpad is not connected or not ready yet, then an error message pops up. Restart the im­port after a few seconds via the button Connect“.
10 Data Export / PC Software 25
In the spectrum view and the irradiance profile graph, you can zoom with the right mouse but­ton. Use left mouse button to zoom out again. Example:
The max. irradiance and dose will then be calculated in active view (irradiance profile).
Working with different measurements: You can select and compare different measurements. You can also add a comment in the table before exporting data.
Note: The UVpad Viewer displays measurement settings and results as sensi­tivity, saturation and errors. Use mouse over function in table view this.
10 Data Export / PC Software 26
10.4 Export of measurements
Measurements can be exported individually, in a group or completely. For this purpose, mark up to 10 measurements.
Button „Deselect all“ deselect marked measurements.
Select “Export selected measurements” or “Export all measurements” for the data export. The
measurements are exported as a text file, separated by a comma, and can thus be imported to a table calculation program, such as Microsoft EXCEL.
The exported file contains all information to the measurement, the spectrum and the irradiation profile.
Marked measurements appear in the display area, as illustrated by the following LED spec­trum:
10 Data Export / PC Software 27
10.5 Displaying and comparing Measurements
Select the desired display via the tab:
Below is an example with two irradiance measurements.
Up to 10 measurements are selectable at the same time and are labeled in the display area with date / time.
Each display can be saved via the button “save chart” as an image file (*.jpg, *.bmp, *.tiff, *.wmf).
10.6 Displaying the Irradiance profile
The irradiance profiles are separately available for all four spectral ranges. For this purpose, mark the desired measurements and select the desired spectral range on the tab “Irradiance profile”.
The following example illustrates an irradiance profile for all spectral ranges.
The data logging takes place adjustable between 10 and 250 ms. With shorter integration times, the maximum irradiance is being saved. The calculation of the dosage is taken out independently in real time.
10 Data Export / PC Software 28
The screen can be adjusted via the zoom function. For this purpose, change the X and the Y intercept and confirm with „Zoom Fit“. The maximum irradiance Emax and the dosage D in the display area are displayed on the right.
10.7 Deleting Measurements
You can delete the entire memory of the UVpad via the button “Delete all measurements”. Confirm the confirmation prompt with OK. Individual measurements cannot be deleted.
Tip: Via the button „Info , the serial number and the assignment of memory space of the UVpad are displayed.
11 Notes for optimal measurement results 29
11 Notes for optimal measurement results
The UVpad achieves optimal measurement results, if the measurement range is well adjusted to the irradiance and thus to the UV system. This is generally taken out automatically. The following notes are there to support you with the setting of the UVpad, so that optimal measurement results can be achieved.
11.1 The UVpad displays MAX
The UVpad saves the maximum irradiance during the measurement. Due to the individual lines in the spectrum, the measurement signal can partly exceed the measurement range. In this case, the UVpad displays the message “MAX. Select low sensitivity or a fixed integration time. Reduce the lamp power, if this is insufficient.
If the measuring range is over modulated in setting “fixed sensitivity” a hint
will be shown after a measurement. Note that measurement data will not be stored.
11.2 Set UVpad for high belt speeds
The measurement time for the UVpad is set via the integration time. Typical integration times are 10 ms to 200 ms. If the UVpad is moved underneath an UV system at slow speed, then the maximum irradiance (directly underneath the UV lamp) is being determined, since several measurements are available for the irradiance. At the end of the measurement, the maximum irradiance and the total dose are displayed.
At high speed and a low lamp power, a higher integration time is required. Thus, the UVpad might possibly not measure directly underneath the UV lamp, but integrates (averages) this range. The displayed irradiance is then minimal lower. With the continuous measurement per­formed, the dosage is not affected. You can determine, whether your UV system is fast or slow, if you calculate the amount of measurements underneath the UV system as follows:
nTimeIntegratioSpeed
UVWidth
tsmeasuremenofAmount
Aggregate__
__
With less than 10 measurements, the displayed (maximum) irradiance can possibly decrease.
fast
slow
11 Notes for optimal measurement results 30
With UV systems with speeds >16 m/min, set a fixed integration time. With fast UV systems, set a fixed integration time
11.3 The UVpad displays too little irradiance values
Check if the sensitivity has been set correctly. Optimal measurement results are achieved, if the measurement range is used to at least 50%. After a measurement, the value M should be higher than 50%.
Select a low or automatic sensitivity or set a short integration time.
When "automatic sensitivity" is set, the spectrum and irradiance will be stored as the optimal measuring range is automatically found. In the case of band systems, it may happen that a maximum is recorded prior to the lamp position and that UVpad is over modulated below the lamp. In this case the shown irradiance may be too low. However, the dose is cor­rectly. In this case a fixed integration time may be helpful.
11.4 The UVpad displays too high or too low UVC Values
The UVpad measures the entire UV spectrum range and divides it standardized into UV spec­trum ranges (UVA, UVB, UVC). For comparison: Broadband radiometers possibly only measure a part of this range, if these do not operate with standardized spectral ranges. Thus, high deviations can arise especially in the UVC. Furthermore, the UV lamps generally emit visible light and IR radiation apart from the UV radiation. Both can generate scattered light in the UVpad, which is then detected. It is also pos­sible that the UVpad heats up during the measurement and thus the reading noise increases. Therefore, the UVpad has an automatic correction function. However, low UVC values can possibly not be avoided, even if the UV lamp does not emit UVC.
11.5 The UVpad displays -
Just like each measurement device, the UVpad has a fixed measurement range. If this range is fallen below, then the UV radiation cannot be captured correctly. In that case, the UVpad dis­plays “ – .
Select a higher or automatic sensitivity or set a long integration time.
11 Notes for optimal measurement results 31
11.6 The measured value is not reproducible
Measurements are only stored and displayed in UVpad when the saturation is between 10% and 100%. This can cause to saturation direct under the light source, however correct meas­urement may be recorded before or after that. Especially UV LEDs can lead to a correct meas­urement switching the LED on within one measurement, while all other are saturated.
Select a fixed integration time.
Note: Reduce the integration time to 10ms and not saturation. Then set the highest possible integration time
12 Cleaning, Maintenance & Troubleshooting 32
12 Cleaning, Maintenance & Troubleshooting
12.1 Calibration
The calibration of the UVpads is checked during the initialization. If the UVpad is not calibrat­ed properly anymore, then this is indicated by a note after the initialization process. Measure­ments are also possible at any time with an expired calibration.
Confirm with the key -key.
The UVpad can only be maintained and calibrated by the manufacturer. For this purpose, please consult your supplier.
UV radiometers are in principle subject to a high high-energy load by UV radiation. This can affect the calibration and lead to an early due date for a re­calibration. This can depend on the individual use, the environment and the radiation sources.
12.2 Cleaning
Skin oil and contamination are absorbing in the UV spectral range and thus affect the meas­urement result. Finger prints or contamination on the optically active entrance opening are therefore generally to be avoided. Should a cleaning become necessary, please use a lintless cloth and Isopropanol. Clean the optically active surface with circular movements. Avoid a strong force. If necessary, leave the UVpad to dry completely after cleaning it. Please note:
For cleaning the optically active surface, please wear gloves.
Do not use Acetone or other chemical cleaning agents to clean the UVpad.
12 Cleaning, Maintenance & Troubleshooting 33
The housing, with the exception of the battery compartment, is not to be opened by the user.
12.3 Battery Change
When the batteries are emty a measurement cannot be started and the UVpad reinitializes. The message "empty battery" is displayed.
Change the batteries. The measured data will be stored. Date and time should be adjusted.
The UVpad is operated with lithium batteries. For a battery change, switch the UVpad off and turn it with the rear panel facing towards you. Loosen the three marked screws with a screw­driver (Torx T6) and remove the cover.
Remove the old lithium batteries carefully and replace them by new ones. Close the cover again and tighten the screws carefully.
Please note:
Only use batteries, which are suitable for up to 70 °C. Appropriate batteries can be obtained from your supplier.
The housing, except for the battery compartment, must not be opened by the user.
The UVpad is calibrated.
ATTENTION: Opening of the housing (except for the battery compartment) leads to a loss of calibration.
12 Cleaning, Maintenance & Troubleshooting 34
12.4 Troubleshooting
The subsequent notes and error messages address the user. The information should help to en­sure the release and the appropriate operation of the reference spectrometer. For this reason,
possible causes and remedies are listed below:
Error / Error Message
Cause
Remedy
The UVpad cannot be switched on
The batteries are empty
Interruption
Change batteries.
Restart the device. For this purpose, remove all batteries and replace them after 5 minutes. The UVpad is in delivery status.
The measured value is not reproducible
Automatic, low or high sen­sitivity selected
Use fixed sensitivity
The UVpad displays too high / too low results
Effect-related measurement
The optically active surface is contaminated
The calibration is invalid
wrong settings
Check the settings for effect­related measurements.
Clean the optically active surface.
Have the UVpad re­calibrated.
check integration time
The UVpad displays a satura­tion “MAX”
Measurement range exceeded
Use the sensitivity setting „low“.
The UVpad displays a strong noise
Sensitivity too low
Increase the sensitivity to „high“.
The calibration is expired
Calibration interval expired
Have the UVpad re­calibrated.
The UVpad is not detected by the PC
The UVpad is switched off
Check USB cable
Switch the UVpad on and wait a few seconds for the initialization.
Use delivered cable.
13 Declaration of Conformity 35
13 Declaration of Conformity
Hereby we,
Opsytec Dr. Gröbel GmbH
Am Hardtwald 6-8
76275 Ettlingen
declare that the following product
spectral Radiometer
Type designation:
UVpad
have been developed, constructed and produced under our sole responsibility and that the product is conform with the following standard(s) or guideline(s) in this declaration:
2014/35/EU
“Directive of the European Parliament and of the Council on the harmonization of the
laws of the Member States regarding the provision of electrical equipment for use within certain voltage limits on the market (Low-Voltage Directive)“.
The conformity of the designated product with the provisions of the directive is verified by full compliance with the following standards:
DIN EN 60204-1: Safety of machinery - Electrical equipment of machines - Part 1: General requirements (IEC 60204-1:2005, modified); German version EN 60204-1:2006
Ettlingen, 04.11.2016
Dr. Mark Paravia Executive Board
Electronically created and valid without signature.
14 Notes 36
14 Notes
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