DS 024-No3 Light Level Sensors.indd
Contents
1. ny DATA HARVEST w Data Harvest Group Ltd 1 Eden Court Leighton Buzzard Beds LU7 4FY Tel 01525 373666 Fax 01525 851638 e mail sales data harvest co uk www data harvest co uk Smart Light Level Sensors Light level Sensor Product No 3120 Range 1 0 to 1000 Lux Resolution 1 Lux Range 2 0 to 110 Transmission Slow linear response Light level Sensor Product No 3122 0 to 100 000 Lux Resolution 30 Lux Smoothed linear response Light level Sensor Product No 3123 Range 1 0 to 1000 Lux Resolution 1 Lux Range 2 0 to 110 Transmission Fast linear response DS 024 Data Harvest Freely photocopiable for use within the purchasers establishment No4 Smart Light Level Sensors Introduction A Smart Q Light level Sensor uses a photodiode which produces a voltage proportional to light intensity It is sensitive to light in the range from 350 nm to 700 nm The Sensor has a built in infrared rejection filter giving it a spectral response similar to that of the human eye The Smart Q Light level Sensors are equipped with a micro controller that greatly improves the accuracy precision and consistency They are supplied calibrated and the stored calibration is automatically loaded when the Light Sensor is connected Connecting The EASYSENSE unit will automatically detect that the Light level Sensor is connected Hold the Light Sensor housing with the Smart Q Sensor ca2. Light Do not let liquids dry up source Avoid direct contact of enzyme to skin and eyes The reaction vessel is a galley pot glass glued to the base of a 150 ml beaker The pot is covered in foil to prevent scattering of light Beaker supported on a tripod to allow space below for the Light Sensor Light level Sensor held in a clamp Milk Powdered milk made to 1 w v Protease Neutrase made to 0 5 v v The enzyme was supplied by the National Centre for Biotechnology Education http Awww reading ac uk NCBE Table of Solutions used Milk cm Enzyme cm8 pH of Buffer Buffer cm8 1 6 4 1 2 2 6 4 4 2 3 6 4 7 2 4 6 4 10 2 1 Assemble the apparatus as shown in the diagram Set up the Light level Sensor so that the only way light can enter is through the central pot in the beaker Turn the light source on 2 Open the EASYSENSE program and select Graph from the Home page Select a recording time of 5 minutes 3 Place 4 cm of protease and 2 cm of a buffer into the central galley pot see table Smart i Light Level Sensors 4 Fill the beaker with water at 30 C this provides heat to speed up the reaction the temperature of the water does not need to be precise but needs to be the same for each run of the experiment Leave for several minutes to let the apparatus reach the same temperatur
3. light levels It has a built in filter to smooth the flicker from fluorescent lamps Investigations Inverse square law Makeshift Colorimeter Studies of the light intensity in various parts of the school Studies of plant growth Rates of reaction Transparency of materials Efficiency of reflectors Investigating different sources of light and their brightness Measuring the intensity of a bulb in a simple electrical circuit Inverse Square Law For this activity the 3120 Light Sensor is used to measure the intensity of light from a lamp as the Sensor is moved away from it The Light Sensor should be set to the Lux range Note This investigation is best done in a room with the lights off Lay ametre rule along the work surface Connect the Light level Sensor to the EASYSENSE unit and place alongside the metre rule Position the light source at the end of the rule pointing at the Light Sensor Metre rule Light level Sensor Light Source Open the EASYSENSE program and select Snapshot from the Home page Select Pre log Function from the Tools menu Select a Preset function with General from the first drop down list and then Asks for Value from the second list Next Type in Distance as the name and enter the units to be used e g cm Finish From the Options icon select X Axis and select Channel OK 3 Smart i Light Level Sensors f necessary click below
4. s user manual Light level Sensor Product No 3122 Range 0 to 100 000 Lux This Sensor is used mainly for measurements in sunlight The large range makes it ideal for environmental monitoring The response from this Sensor is smoothed to filter out unwanted signals of higher frequencies Investigations Environmental monitoring Weather study to monitor sunrise and sunset times Photovoltaic panel performance Light level Sensor FAST response Product No 3123 Range 1 0 to 1000 Lux Range 2 0 110 Transmission This Light Sensor can monitor rapid variations in light intensity which cannot be observed with the eye e g fluctuations in the light intensity of a bulb due to volt age fluctuations These variations can be a source of interference to the Sensor in general use Investigations Light lx Capture of the modulation of luorescent lamp 100 Hz modulation OUMNH LANA ARAMA zoo MAYAN Light level with the Guorescent lamp 00 s n i 0 000 0 250 0 500 0 749 0 999 08 September 1909 18 16 45 Time 5 e Modulations of a fluorescent lamp due to mains frequency and the effects of on off switching of the light using a FAST recording time e Remote control modulation patterns Smart i Light Level Sensors Light level Sensor Product No 3120 Range 1 0 to 1000 Lux Range 2 0 110 Transmission This is a general purpose Sensor with a range that makes it suitable for use at indoor
5. the X axis so that Distance is displayed Select Test Mode from the Tools menu Switch on your light source Move the Light Sensor away from until the value from the Sensor is within it s range e g 950 Lux or less Click on the Start Stop icon Click in the graph area to take a snapshot measurement and type the distance between the Sensor and light source into the enter value box OK Move the Light Sensor further away from the light source e g 0 5 cm and record another measurement Repeat these steps until the value from the light source becomes too low Click on the Start Stop icon to finish recording Light Ix Inverse square law 1000 M aE au ns 900 0 2 5 800 Pe m 0 700 30 0 2 ao 600 isi a0 5 500 ior Fy i 400 S 300 s i 200 E 100 0 30 0 40 0 50 0 60 0 70 0 80 0 90 0 100 0 01 June 2006 14 24 14 Distance cm The collected data could be imported into Excel for further investigation e g for determining the equation for best fit by selecting Transfer to Excel from the Edit menu Smart i Light Level Sensors How does an enzymes protease activity change with pH This experiment uses an enzyme that digests the proteins in a powdered milk solution to make it go from white to transparent As the milk becomes more transparent light will travel through it more easily The Light Sensor should be set to the Transmission range HAZARD INFORMATION
6. ble label showing on the top A with ne e Push one end of the sensor cable supplied with 2 ad S the EASYSENSE unit into the shaped socket on SN the sensor housing with the locating arrow on the Input A cable facing upwards socket N Connect the other end of the cable to the Input Smart Q A socket on the EASYSENSE unit with the locating ran gt N arrow facing upwards To set the range Two of the types of Light level Sensor Product No 3120 and 3123 have a choice of ranges 0 to 1000 Lux and 0 110 Transmission The range can be changed by selecting Sensor config from the Settings menu in the EASYSENSE program Connect the Light Sensor to the EASYSENSE unit Set Sensor Range x Open the EASYSENSE program and select one of the logging options from the Home page Select satel Sensor Config from the Settings menu Select Range Select the Light Sensor from the list it will be listed E using its current arrange and click on the Change g Range button 1000 Lux Transmission The current range will be highlighted Select the required range and click on OK Close Sensor Config Click on New and then Finish for the change in range to be detected by the logging option Smart i Light Level Sensors The range setting will be retained until changed by the user With some EASYSENSE units it is possible to change the range from the unit Please refer to the EASYSENSE unit
7. e 5 Select Test Mode from the Tools menu and adjust the height of the light source so the Light Sensor gives a reading of approximately 100 transmission 6 Place 6 cm of milk into the central galley pot and click on the Start Stop icon 7 When the recording has stopped right click in the graph area and select Add Text Label the graph with the pH of the buffer used 8 Select Overlay and repeat the experiment using the range of buffers supplied smittance T EXect of pH on an enzyme protease milk protein 3204 Fi a pada ool i 00 00 01 15 0230 0345 05 00 29 May 2002 16 32 13 Time mmcss Theory Light is produced by the release of energy from the atoms of a material when they are excited by heat chemical reaction or other means It travels through space in the form of an electromagnetic wave a form of radiant energy There are many kinds of energy including ultraviolet infrared rays radio waves and X rays We only see a minute part of the radiant energy spectrum the part that is called visible light Each type of radiation has its characteristic wavelength which is defined as the distance a wave travels in one cycle The wavelength of UV visible light and IR waves are very small and are measured in nanometres nm i e billionths of a metre 400 nm 700 nm VISIBLE LIGHT below 450 nm ULTRAVIOLET 450 500 nm INFRARED 500 570nm To X rays amp Gamma Rays Yellow 570 590 nm To Radar
8. r or replacement at no expense to the user other than postal charges Note Data Harvest products are designed for educational use and are not intended for use in industrial medical or commercial applications WEEE Waste Electrical and Electronic Equipment Legislation pi Data Harvest Group Ltd are fully compliant with WEEE legislation and are pleased to provide a disposal service for any of our products when their life expires Simply return them to us E clearly identified as life expired and we will dispose of them for you
9. waves Orange 590 610 nm 610 700 nm t Smart i Light Level Sensors The Light Sensor utilises the photometric Radiometric Sensitivity system of measurement that defines light 04 in terms of how it is perceived by the z0 human eye The eye s sensitivity is 0 25 dependent on the wavelength or colour Pie of the light Peak sensitivity occurs in the An green part of the visible spectrum while the 0 eye s response to infrared or ultraviolet is 200 400 600 800 1000 zero Wavelength mm The photodiode used in this Sensor has selected for its maximized response through the visible part of the spectrum and its built in infrared rejection filter Lux measurement One unit of Lux is the equivalent of the light from a candle at a distance of 1 metre 50 Lux a 60 watt bulb at a distance of 1 metre 100 Lux a 100 watt bulb at a distance of 1 metre 500 Lux Florescent light 1000 Lux Overcast Day 20 000 Lux Winter Sun 80 000 Lux Summer Sun Warranty All Data Harvest Sensors are warranted to be free from defects in materials and workmanship for a period of 12 months from the date of purchase provided they have been used in accordance with any instructions under normal laboratory conditions This warranty does not apply if the Sensor has been damaged by accident or misuse In the event of a fault developing within the 12 month period the Sensor must be returned to Data Harvest for repai
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