Irradian PR203 Manual de usuario

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Handbook Ref. No. IH005/Issue D

Issue Date: 01/11/2013

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    1 Introduction

2 Front Panel Controls

3 Operation

4 Special Function Modes

5 Care and Maintenance

6 Battery Replacement

7 Environmental Care, Recycling and Disposal

PR203 Radiometer Irradian Limited

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The Irradian portable phototherapy radiometer (model PR203) is

designed specifically to measure the spectral irradiance of blue light

sources which are used for the treatment of hyperbilirubinaemia in new

born babies.

The radiometer comprises of a hand held, battery operated display unit, a

small detector and a connecting cable.

The detector is carefully constructed to give an optical response that

closely matches the absorption curve of bilirubin; that prevents the

measurement of non-therapeutic light and that allows accurate

measurements of three different types of light sources, where ever they

are placed with respect to the radiometer. The sensor used in the

detector is a silicon photodiode which performs with excellent linearity

and long term stability.

Note the PR203 radiometer is not an ultra violet radiometer and

should not be used to measure the output of ultra violet lamps such

as those often used in ultra violet phototherapy treatment.

Irradian Limited PR203 Radiometer

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PR203 DISPLAY UNIT

PR203 Radiometer

DETECTOR RS232

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



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



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Figure 1

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4½ digit LCD display

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

MODE select button







Display backlight button





FUNCTION RESET button







Background ZERO button





HOLD/RUN function button







RESET button





Power switch button

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



Auto/manual RANGE button

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Computer connection



SOURCE select button



Detector connection

The battery compartment cover is at the rear of the display unit.

PR203 Radiometer Irradian Limited

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(continued):

BUTTON AND CONNECTOR DESCRIPTIONS





Turns the display backlight on and off.

The display backlight will turn off automatically

after 60 seconds.

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

ZERO Starts a zero or background measurement.





RESET Press to return to the normal measurement

mode from either the manual range or special

function modes.

Note the display hold is not reset.

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RANGE Selects either auto ranging or manual range

control. In manual range control, repeated button

pressing steps through the gain ranges.



SOURCE Select between the three measurements of

irradiance from different light sources;

Halogen, Fluorescent or LED (Light Emitting

Diode) in spectral irradiance units (µW/cm

/nm).



MODE Select between the Average, Min, Max and

Integrate special function modes.



FUNCTION RESET Press to reset the function mode values to zero.



HOLD/RUN Press to hold the current reading.

Press again to release the held readings.

Press to run or hold a special function mode.





Turns the power on and off.



Connector Computer interface connection (5 pin RS232).

(optional radiometer-computer interface cable).



Connector Detector connection (8 pin).

Irradian Limited PR203 Radiometer

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SWITCHING ON

1) With the unit initially OFF, plug the detector 8 pin connector into the

detector socket



on the top of the display unit.

2) Clean the white diffuser on the top of the detector if it looks marked or

dirty (see Section 5, CARE AND MAINTENANCE).

3) Press and release the power button



on the PR203 display key pad.

The radiometer will start, with the display briefly showing:-

The radiometer will now automatically search for the correct range to

use with the current light levels.

A typical display is shown:-

On the front panel, one LED will indicate the measurement units and

another, which light source is currently selected (Halogen,

Fluorescent or LED). This will be the same as that last selected when

the radiometer was switched off.

4) Press and release the SOURCE button

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to select the correct source

required. For incandescent sources the correct setting is ‘Halogen’.

For irradiance measurements with a fluorescent tube, the correct

setting is ‘Fluorescnt.’ and with a blue dominant wavelength LED the

correct setting is ‘LED’.

PR203 Radiometer Irradian Limited

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(continued):

5) The radiometer should be zeroed regularly to remove the unwanted

background level. First, place the supplied blanking cap over the

detector diffuser. Then press and release the ZERO button



Whilst the zero is being taken, the display will show:-

6) The radiometer measures the background level on each of the gain

ranges and stores these values in memory. All further measurements

will subtract these values before displaying the correct measurement.

At the end of the zero sequence the display will show:-

7) Remove the blanking cap from the front of the detector. The

radiometer is now ready for use.

Irradian Limited PR203 Radiometer

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     

        

     

  

  

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AVERAGE MODE

When the light source is unstable, press and release the MODE button



to switch to average mode. The radiometer will switch to manual

ranging with the Manual LED on. The Average LED will also switch on,

the SOURCE LED will remain unchanged.

To begin to average the readings, press and release the HOLD/RUN

button



. Initially 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.

At any time the averaging process can be stopped by pressing the

HOLD/RUN button



. The display will flash ‘HOLd’ intermittently.

At any time the averaging sequence can be reset by pressing and

releasing the FUNCTION RESET button



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 (button



) and

manually change the RANGE (button



) to a lower lever. e.g. from a

34.00 range to the 34.0 less sensitive range.

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