Irradian UV201 Instruction Manual
Handbook Ref No. MH095 Issue E
File Ref: UV201VE.doc
1 Introduction
2 Specification
3 Operation
4 Irradiance Measurements
5 Battery Replacement
6 Cosine Angular Response
7 Calibration Description
8 Care and Maintenance
9 Block Diagram
10 Environmental Care, Recycling & Disposal
Handbook Update Log
Issue Date Items changed
A 30/1/01 New Issue
B 12/10/05 Handbook update
C 08/07/08 WEEE update
D 16/02/10 Format update
E 17/08/12 Format update
UV201 Radiometer Irradian Limited
1
The Irradian portable digital UV radiometer model UV201 is a versatile
direct reading instrument designed specifically for measuring UV
irradiance. It is supplied with an ultra violet A sensitive detector as
standard, although detectors with other responses are available.
This instrument is especially useful for monitoring the ultra-violet
emissions from high and low pressure mercury vapour lamps, metal
halide lamps and ultra violet fluorescent lamps. A liquid light guide
adaptor can be supplied for connecting 8 mm φSeries 300 liquid
lightguides to the detector. Other lightguide adaptors are also available
on request.
UV201 Series
Model Detector Peak Response FWHM
UV201A SD221A Cos 365 ± 2nm 35 ± 2nm
UV201B2 SD221B2 Cos 311 ± 2nm 19 ± 2nm
UV201-390 SD221-390 Cos 392 ± 2nm 23 ± 2nm
UV201-420 SD221-420 Cos 420 ± 2nm 82 ± 2nm
UV201-450 SD221-450 Cos 450 ± 2nm 48 ± 2nm
Note: All detectors have a cosine angular response.
Irradian Limited UV201 Radiometer
2
UV201 RADIOMETER
Range: 0 - 1999.9 mW.cm
-2
(Other ranges available on request).
Standard Calibration: The radiometer with detector / filter is
calibrated at the detector's peak response
with a monochromatic source.
Spectroradiometric Cal. The radiometer with detector / filter is
calibrated to match the measurement of a
spectroradiometer for a particular source,
e.g. mercury or metal halide discharge lamps
or a fluorescent lamp.
Accuracy Absolute calibration accuracy ± 7.5 % traceable
to NPL standards.
UV201X DISPLAY UNIT
Front Panel Controls:
ZERO Initiates a zero or background measurement
routine.
HOLD/RUN Display is held at present reading until HOLD
button is pressed again.
Power on / off button.
Controller: 80C51 based 8bit micro-processor with a
3.6864MHz clock.
Memory On board non volatile RAM for calibration
factors and set-up parameters.
Integration Time 0.33 s.
Conversion Scale 17 bit.
Conversion Accuracy: Measurement accuracy ± 1digit with a
linearity error of < 1 %.
UV201 Radiometer Irradian Limited
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(continued):
Display: 4½ digit lcd display. Character height 10 mm.
Connector: 8 pin mini DIN type detector connector.
6 pin mini DIN type RS232 connector for factory use only.
Power Supply: 9 volt 1200 mAh, PP3 battery.
Power Consumption: Shut down mode < 5 µA.
Operating 10 - 20 mA.
Battery Life ~ 50 hours.
Temperature Range: 0 to 40 °C. 80 % RH.
Dimensions: 150 x 80 x 45 mm.
High impact polystyrene.
Weight: Approximately 270 g.
Irradian Limited UV201 Radiometer
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(continued):
DET201UV-Cos DETECTOR
Amplifier PCB Photodiode
Cable
Glass Filters
Cosine Diffuser
The SD221-Cos detector comprises of an aluminium housing,
photodiode, glass filter, cosine corrected diffuser and PCB assembly.
Detector: 5.2 mm² high stability GaAsP photodiode.
Spectral Responses: Refer Figures 1 & 2.
Visible & NIR Blocking: > 10
5
from 420 to 1000 nm for UVA & UVB2
detectors.
Angular Response: Accurately cosine corrected to Lambert's
Cosine Law. Maximum error is less than ± 5 %
from true response to 70° from normal
incidence, reference Section 5.
Temperature Coefficient: -0.1 % per °C.
Amplifier Gain 1x10
4
V/A.
Current to Frequency 0 - 0.5 MHz.
Linearity Error: < 1 % across range.
Temperature Range: Operation: -10 to +60 °C.
Storage: -20 to +70 °C.
Detector Housing: Black anodised aluminium alloy housing.
Cable: 1 metre cable to 8 pin mini DIN type connector.
Weight: Approximately 140 g.
UV201 Radiometer Irradian Limited
5
(continued):
DET201A-Cos 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
DET201B2-Cos Detector
0
20
40
60
80
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 UV201 Radiometer
6
SETTING UP
1) With the unit OFF, plug the detector 4 way connector into the detector
socket on the top of the display unit.
2) Press and release the power switch on the UV201 display key pad.
The microcontroller will initiate, the display momentarily showing:-
The radiometer display will now change to show the mW.cm
-2
value.
A typical display is shown below.
3) It is recommended that the radiometer amplifier is nulled periodically.
Place a cover over the detector. Press and release the ZERO switch,
the display will momentarily show:-
4) The micro controller will now measure the amplifier offset and store
this value in the non volatile memory. All subsequent measurements
will first have this offset subtracted before displaying the
measurement. At the end of the sequence the display will show:-
5) Remove the light cover from the detector. Fit the liquid light guide
adapter if required. The equipment is now ready for use.
UV201 Radiometer Irradian Limited
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(continued):
6) At any time the measurement process can be halted by pressing the
HOLD/RUN button. Pressing the button once again will resume the
measurement process.
7) If the light level fluctuations are large and any one reading causes the
detector amplifier to overload at this range, the display will show:-
Irradian Limited UV201 Radiometer
8
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.
ALL the DET201UV-Cos detectors are cosine corrected. Measurement
errors will increase as the angle of irradiance increases from the normal
to the filter ring front surface.
UV201 Radiometer Irradian Limited
9
1) Switch off the radiometer before changing the battery.
2) Slide open the battery compartment on the back of the radiometer and
pull out the battery. Disconnect from the battery clip.
3) Replace with a size PP3 9 volt battery.
4) Place battery inside compartment and slide cover closed.
5) Note it will be necessary to switch on and off the radiometer before
normal operation will commence.
Irradian Limited UV201 Radiometer
10
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 i is 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°.
DET201UV-Cos Detectors
True Cosine Response
Figure 3
Irradian's cosine diffusers are corrected to match the cosine response to
within ± 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.
UV201 Radiometer Irradian Limited
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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 exceeds the specification limits. A graph of
the final filter/detector response is provided. The data is also available on
request for importing to a spreadsheet.
The radiometer with detector and filter is calibrated using monochromatic
light at the peak wavelength of each filter or at a specified wavelength
(refer to calibration certificate). Other calibration techniques can be
applied to suit the user's application. For example matching the
radiometer output to the output from a high accuracy spectroradiometer
(Irradian model SR9910-V7) 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.
Irradian Limited UV201 Radiometer
12
1) The UV201 display unit can be cleaned using a moist cloth with
detergent. Do not use solvent or alcohol to clean surfaces.
2) The diffuser on each filter ring should be kept clean at all times.
3) The radiometer is a precision instrument, protect from shocks.
4) Avoid supporting the detector by the multi core cable.
UV201 Radiometer Irradian Limited
13
!
! !
!
Diffuser
Filter
Detector
Amp v to f Counter
µController
Keypad
Liquid Crystal
Display
Display Driver
Detector Amplifier
Micro-Controlled Display Unit
Non Volitile RAM
Irradian Limited UV201 Radiometer
14
"
" "
" #
##
#
The purpose of the European Commission WEEE directive (Waste
Electrical and Electronic Equipment; 2002/96/EC) is to ensure that
electrical and electronic products are recycled using the best treatments,
recovery and recycling techniques that are currently available. This is so
that high health standards and a lasting environmental protection can be
achieved and maintained.
This product has been designed and manufactured using high quality
materials and components, many of which can be recycled and reused.
Please remember to observe the local regulations that govern both the
disposal of the packaging materials accompanying this product and any
used batteries.
DO NOT DISPOSE OF THIS PRODUCT IN YOUR
GENERAL WASTE BIN.
Please inform yourself about your local WEEE collection
system which is available for electrical and electronic
products that are marked with the symbol shown here.
When disposing of this meter, please use one of the following options:
1) Use your local designated WEEE collection facilities to dispose of the
complete product (including cables, detectors, filters & accessories).
2) Return the complete product back to Irradian, marking it clearly as
intended for WEEE disposal.
$%&
$%& $%&
$%&
9 Elphinstone Road Telephone: +44 (0)1875 898-083
Tranent Facsimile: +44 (0)1875 616-528
Scotland EH33 2LG Web: www.irradian.co.uk
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4
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