Irradian UV203-3 User manual
Handbook Ref No. MH079/Issue E
File Ref: UV2033vE.doc
1. Introduction
2. Specification
3. Power On / Detector Select Sequence
4. Operation
5. Irradiance Measurements
6. Cosine Angular Response
7. Calibration Description
8. Care and Maintenance
9. Block Diagram
10. Programming via the RS232 interface
11. Environmental care, recycling and disposal
Handbook Update Log
Issue Date Pages changed
A 27/7/99 New Issue
B 23/11/00 Version 5 programming
C 18/06/02 Calibration update
D 18/12/07 Performance update
E 19/12/11 Handbook reformat
UV203-3 Radiometer Irradian Limited
1
The Irradian portable radiometer model UV203-3 is specially designed for
the measurement of underwater irradiance in the UVA band, the UVB2
band and the radiometric band between 400 and 700nm.
The equipment comprises of a display unit and a submersible detector
head with three photodiode detectors, linked with a robust 10 metre
cable.
The micro-processor controlled display unit features a 4½ digit direct
reading liquid crystal display, auto or manual gain control of the detector
amplifiers and detector selection. Operations include back ground zero
measurement and display hold. The radiometer can also be used to
measure the average irradiance on a selected detector and record the
minimum and maximum values during the averaging period. In addition
the integrated irradiance in mJ/m² or J/m² is calculated.
The detector head comprises of three, high stability photodiode detectors
with glass absorption filters for the selected spectral band and a cosine
corrected input diffuser. Each of the detectors has its own high gain, low
noise amplifier and digitiser. This design ensures only resilient digital
signals are transmitted along the interconnecting cable.
The model UV203-3 provides the following:
1 UV203-3 display unit with two PP9 type batteries
1 DET203-3UV-VIS triple detector with 10 metre cable
1 RS232 interface cable
1 Blanking plate
1 Handbook
1 Calibration certificate
1 CC-8 Foam lined carrying case.
Irradian Limited UV203-3 Radiometer
2
DISPLAY UNIT UV203-3
Controller: 80C51 8bit micro-processor with a 3.1684MHz
clock.
Memory On board non volatile RAM for calibration
factors and set-up parameters.
Key Operation 7 switch key board with 11 LED indicators.
(display backlight not fitted)
Power Switch Microprocessor reset at switch on.
Background zero levels stored prior to shut off.
Serial Interface Three wire RS232 serial interface.
4800 baud, no parity, 1 stop bit.
Integration Time 0.33s
Conversion Scale 17 bit
Accuracy: Measurement accuracy ±1digit with a
linearity error of <1%.
Display: 4½ digit LCD. Character height 10mm.
Power Supply: Two, 9 volt PP3 Alkaline.
Power Consumption: Shut down mode <5µA
Operating 10 - 20mA
Operating with RS232 30 mA
Battery Life 150 hours*.
* = without RS232 interface connection.
Irradian Limited UV203-3 Radiometer
3
(continued):
Ranges: Each of the filter rings have up to six ranges according to
the table below:
Full Scale \ Filter Ring UVA UVB2 RFF-Vis
1.9999 mW.m
-2
19.999 mW.m
-2
199.99 mW.m
-2
1999.9 mW.m
-2
19.999 W.m
-2
199.99 W.m
-2
1999.9 W.m
-2
19999 W.m
-2
19999 x10 W.m
-2
Calibration Type: Standard Standard Mercury
Note: Other filter rings and ranges are available on request.
Standard Calibration: The radiometer with detector and filter rings is
calibrated at the peak response of each filter ring
using a monochromatic source. The calibration
plane is at the front of the filter face.
Mercury Calibration: The radiometer with detector and filter rings is
calibrated at a wavelength corresponding to a
mercury emission line. The calibration plane is
34 mm back from the front of the filter face,
corresponding to the position of the photodiode.
Spectroradiometric Cal. The radiometer with detector and filter rings is
calibrated to match the measurement of a
spectroradiometer on a particular source.
Accuracy Absolute calibration accuracy ±7.5% traceable
to NPL standards.
Irradian Limited UV203-3 Radiometer
4
(continued):
203 Optical Radiometer
x4
DETECTOR
RS232
+9V EXT.
EXT.
SUPPLY
ON/OFF
Cover fixing screws
Detector select button
4½ digit LCD display
MODE select button
Background ZERO button
FUNCTION RESET button
Mode RESET button
Display HOLD Function RUN button
Auto/manual RANGE button
Power switch button.
Irradian Limited UV203-3 Radiometer
5
(continued):
Front Panel Controls:
RANGE Select auto ranging or manual range control.
UNITS Select between UVA, UVB and RFF detectors.
ZERO Initiates a zero or background measurement
routine on all gain ranges.
HOLD/RUN Display is held at present reading until HOLD
button is pressed again.
Select to run or hold a special mode.
MODE Select between, AVERAGE, MIN, MAX and
INTEGRATE modes. Press RESET to return
to normal measurement mode.
FUNCTION/RESET Press to reset function values to zero
RESET Press to return to normal measurement mode
from Manual range control or special modes.
Note the display hold is not reset.
Power on / off button
Display backlight on off button (not fitted).
Detector Connector: 8 pin circular screw lock type connector.
RS232 Connector: 5 pin circular screw lock type connector.
Ext. power supply: 3 pin circular screw lock type connector.
Temperature Range: 0 to 40°C. 80% RH.
Dimensions: 180 x 130 x 60mm.
High impact polystyrene.
Protection: IP67 (short term soaking)
Weight: 500g
Irradian Limited UV203-3 Radiometer
6
(continued):
SEALED TRIPLE DETECTOR, Model DET203-3UV-Vis
The DET203-3UV-Vis detector comprises of an aluminium housing, three
photodiode detectors with filter glasses amplifier and digitiser.
Detector Housing: Black anodised aluminium alloy housing.
Sealed waterproof to 10 metres
Cable: 10 metre cable to 8 pin type connector
RFF Detector
UVA Detector
UVB Detector
Irradian Limited UV203-3 Radiometer
7
(continued):
UVA DETECTOR
Detector: 33mm² Silicon photodiode.
Spectral response: Ref figure 1
λ
peak
@ 369 ±2nm, FWHM 37 ±2nm.
Visible & NIR Blocking: >10
5
from 420 to 1000nm
Angular Response: Accurately cosine corrected to Lambert's
Cosine Law. Maximum error is less than ±3%
from true response to 70° from normal
incidence, reference section 4.
Temperature Coefficient: -0.1 to -0.2 %/°C
Amplifier Gain 5x10
9
V/A to 5x10
3
V/A
Current to Frequency 0 - 0.5Mhz
Linearity Error: <1% across ranges
Temperature Range: Operation: 0 to +40°C
Storage: -20 to +60°C
Spectral Response of UVA Detector
0
10
20
30
40
50
60
70
80
90
100
320 330 340 350 360 370 380 390 400 410
R
e
s
p
o
n
s
e
%
Wavelength (nm)
Figure 1
Irradian Limited UV203-3 Radiometer
8
(continued):
UVB2 DETECTOR
Detector: 21mm² GaAsP photodiode.
Spectral response: Ref figure 2
λ
peak
@ 311 ±1nm, FWHM 19 ±2nm.
Visible & NIR Blocking: >10
5
from 400 to 1000nm
Angular Response: Accurately cosine corrected to Lambert's
Cosine Law. Maximum error is less than ±3%
from true response to 70° from normal
incidence, reference section 4.
Temperature Coefficient: -0.15 to -0.2 %/°C
Amplifier Gain 5x10
9
V/A to 5x10
3
V/A
Current to Frequency 0 - 0.5Mhz
Linearity Error: <1% across ranges
Temperature Range: Operation: 0 to +40°C
Storage: -20 to +60°C
Spectral Response of UVB2 Detector
0
10
20
30
40
50
60
70
80
90
100
270 280 290 300 310 320 330 340 350 360
R
e
s
p
o
n
s
e
%
Wavelength (nm)
Figure 2
Irradian Limited UV203-3 Radiometer
9
(continued):
RFF DETECTOR
Detector: 33mm² Silicon photodiode.
Spectral response: Ref figure 3
Angular Response: Accurately cosine corrected to Lambert's
Cosine Law. Maximum error is less than ±3%
from true response to 70° from normal
incidence, reference section 4.
Temperature Coefficient: 0 to -0.1 %/°C
Amplifier Gain 5x10
9
V/A to 5x10
3
V/A
Current to Frequency 0 - 0.5Mhz
Linearity Error: <1% across ranges
Temperature Range: Operation: 0 to +40°C
Storage: -20 to +60°C
Spectral Response of RFF Detector
0
10
20
30
40
50
60
70
80
90
100
350 380 410 440 470 500 530 560 590 620 650 680 710 740 770 800
R
e
s
p
o
n
s
e
%
Wavelength(nm)
Figure 3
Irradian Limited UV203-3 Radiometer
10
POWER ON
READ STORED
CALIBRATION &
ZERO LEVELS
SELECT UVA DETECTOR
AUTO RANGE UVA
AMPLIFIER GAIN
MEASURE UVA SIGNAL
SUBTRACT ZERO LEVEL
DISPLAY IRRADIANCE
PRESS DETECTOR SELECT BUTTON
AUTO RANGE UVA
AMPLIFIER GAIN
MEASURE UVA SIGNAL
SUBTRACT ZERO LEVEL
DISPLAY IRRADIANCE
ZERO
MODE
RANGE
FUNCTION RESET
RUN
HOLD
RESET
ZERO
MODE
RANGE
FUNCTION RESET
RUN
HOLD
RESET
PRESS DETECTOR
SELECT BUTTON
FOR RFF DETECTOR
Irradian Limited UV203-3 Radiometer
11
SETTING UP
1) With the unit OFF, screw the detector 8 way connector into the
detector socket on the top of the display unit.
2) Note: Carefully clean the white cosine diffuser inputs on the top of the
detector if they are marked or dirty.
3) Press and release the power switch on the UV203-3 display key pad.
The micro controller will initiate with the display momentarily showing:-
The radiometer will now search for the optimum range on the detector
amplifier. A typical display is shown below.
An LED will illuminate indicating the UVA detector selection and
calibration with either the mW.m
-2
or W.m
-2
units LED on.
4) Press and release the UNITS switch to select the detector and
calibration required.
5) It is recommended that the radiometer amplifiers are nulled
periodically. Place the cover over the detector. Press and release the
ZERO switch, the display will momentarily show:-
Note it is necessary to perform the nulling procedure on each detector
amplifier. The values for the three detector amplifiers are stored
separately in the non volatile memory.
Irradian Limited UV203-3 Radiometer
12
(continued):
6) The micro controller will now measure the amplifier offset on each of
the gain ranges and store these values in the non volatile memory. All
subsequent measurements will first have one of these offsets
subtracted before displaying the measurement.
At the end of the nulling sequence the display will show:-
Note if the radiometer units are set to UVB the display will show 00.00
and if set to RFF the display will show 0.0000. If the display does not
show that the amplifier offset has been nulled, repeat the operation
once again to give the display shown above.
7) Remove the detector light cover. The equipment is now ready for use.
AVERAGE
When the light is unstable, press and release the MODE switch. The
radiometer will now switch to manual ranging, Manual LED on, if not yet
previously in manual ranging. The Average LED will now switch on, but
the Units LED will remain unchanged.
To start an average sequence press and release the HOLD/RUN switch.
Immediately the display will show a fluctuating signal, reflecting the light
source fluctuations. After a short time the amplitude of the fluctuations
will decrease and the display will begin to show a reading which
represents the average light level during the period of the measurement.
The averaging process can be halted by pressing the HOLD/RUN button.
At any time the averaging sequence can be reset by pressing and
releasing the FUNCTION RESET switch.
If the light level fluctuations are large and any one reading causes the
detector amplifier to overload at this range the averaging process will be
terminated and the display will show:-
To avoid an overload condition, RESET the radiometer and manually
change the RANGE to a lower gain. e.g. from a 34.00 range to 34.0.
Irradian Limited UV203-3 Radiometer
13
(continued):
MIN & MAX LEVELS
During an average measurement sequence the maximum and minimum
values attained in the period are recorded. Press HOLD to halt the
averaging sequence. Press the MODE button to select between Average,
Min and Max. Note the Integrate display may overload and show - 0 L -.
It is also possible to view a MIN or MAX recording sequence by selecting
MIN or MAX prior to selecting RUN.
Press FUNCTION RESET to set the maximum and average values to
zero and the minimum to - 0 L -. Note the FUNCTION RESET will
operate during a measurement sequence or in the HOLD mode.
INTEGRATE
For measurements of the integrated dosage or exposure press the
MODE switch to select Integrate. Press the RUN switch to start the
measurement. The display will now autorange as the dosage increases.
Note the detector amplifier will not autorange and as with Average
measurements if the amplifier overloads the display will show - 0 L - and
the measurement will halt.
Units for integrated measurements are shown below the main units on
the radiometer, (in parenthesis) mJ.m
-2
and J.m
-2
.
At the end of the integration period HOLD the display. Use the MODE
switch to also display the Min,Max and Average values.
Press FUNCTION RESET to set the integrate, maximum and average
values to zero and the minimum to - 0 L -. Note the FUNCTION RESET
will operate during a measurement sequence or in the HOLD mode.
Irradian Limited UV203-3 Radiometer
14
CAUTION: ULTRA VIOLET RADIATION IS HAZARDOUS TO BOTH
THE EYES AND SKIN. TAKE CARE TO AVOID PERSONAL
EXPOSURE DURING MEASUREMENTS.
Irradiance is the measurement of radiometric light per unit area, watts
per metre, W/m
-2
. The part of the spectrum to be measured is defined by
the filter fitted onto the detector. Ideally this should be a filter with a
square spectral response. In practice it rarely is and the filter is defined
with a peak response wavelength and a full width half maximum, FWHM
bandwidth. In all applications it is vital to know the part of the spectrum
being measured by the detector and filter, and if possible to know the
spectrum of the light source. In addition the radiometer should be
calibrated to best suit the measurement conditions. It may even be
necessary to have more than one calibration factor for the same detector
/ filter combination.
For most applications the measurement plane is horizontal and a cosine
corrected diffuser is fitted to the front of the detector assembly. If the
working surface is not horizontal then placing the detector on or parallel
to the worktop is a more representative measurement of irradiance.
Note that all the light sources in the hemisphere above the detector will
contribute to the measurement. The sources may be obvious, lamps or
windows or even walls or other reflecting surfaces. Take care not to
shadow the detector during all measurements.
Each detector has its own cosine corrected diffuser. Measurement errors
will increase as the angle of irradiance increases from the normal to the
filter ring front surface.
A useful technique for measuring the sensitivity of the detector filter to
non ultra violet light is to place a high pass filter glass over the front of the
filter ring and record the reading. If the high pass filter blocks all the light
across the spectral response region of the UV filter then a zero reading
would imply the detector/filter is only sensitive to the UV light. Readings
other than zero would imply there is some sensitivity to visible or near
infra-red light.
Irradian Limited UV203-3 Radiometer
15
!
!!
! "
" "
"
Irradiance is a measurement of the amount of light incident on a unit area
(watts/m²). Any detector will measure this reliably when measuring a
beam of light perpendicular to the detectors surface, however, when
measuring scattered light or light from an extended source the sensor
must have an accurate response over its 180° field of view. More
importantly, this response should be proportional to the cosine of the
angle of light incident on the detector. This comes from the fact that the
projected area of any surface at an angle of iis proportional to Cos(i).
To ensure that the integration of light from all angles is correct, the
cosine diffuser matches the angular response so that response of the
detector decreases with Cos(i) as the angle between the source and
detector increases from 0 to 90°.
UV* Cos-113
True Cosine Response
Figure 6
Irradian's cosine diffusers are corrected to match the cosine response to
within ±3.5% up to angles of 70°. This ensures that the meter correctly
reads illuminance or visible light flux density whether it is measuring light
from an extended or a point source.
Irradian Limited UV203-3 Radiometer
16
#
##
#
Irradian holds a number of tungsten halogen and deuterium lamps and a
silicon photodiode which are routinely calibrated by the National Physics
Laboratory in the UK.
During manufacture each filter ring and detector has its spectral
response measured. Changes are made to the filter glasses if the peak
wavelength or filter bandwidth exceed the specification limits. A graph of
the final filter/detector response is provided. The data on a disk is also
available on request for importing to a spreadsheet.
The radiometer with detector and filter rings is calibrated using
monochromatic light at the peak wavelength of each filter or at a
specified wavelength (ref calibration certificate). Other calibration
techniques can be applied to suit the users application. For example
matching the radiometer output to the output from a high accuracy
spectroradiometer (SR9910) for a particular light source like PUVA
tubes.
As with all measuring equipment a routine calibration is recommended,
typically annually, but with frequent use by a number of different users a
shorter recalibration period may be necessary.
Contact Irradian for any calibration requirements for this product and for
further information.
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