Irradian UV201 Instruction Manual

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Handbook Ref No. MH095 Issue E
File Ref: UV201VE.doc

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   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
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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
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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 %.

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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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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.

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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
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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.