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UVX Radiometer

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Figure 4: Calibration Current Source

Figure 5: LCD Display Pin-outs

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Summary of Contents for UVX

Page 1: ...ltra Violet Products Ltd 2066 W 11th Street Unit 1 Trinity Hall Farm Estate Upland CA 91786 Nuffield Road Cambridge CB4 1TG UK Phone 800 452 6788 Phone 44 0 1223 420022 Fax 909 946 3597 Fax 44 0 1223 420561 Web Site www uvp com 81 0064 01 Rev L ...

Page 2: ...n 9 Radiometer Maintenance 10 Sensor Details 16 Sensor Characteristics 16 Calibration Information 16 Sensor Maintenance 20 General Precautions 20 Application Techniques 23 Definition of Radiant Incidence 23 Wavelength Considerations 23 Cosine Response 26 Summary 26 Safety Precautions 27 Component List Replacement Parts and Options 30 Component List 30 Replacement Parts 31 Options 31 Warranty 32 ...

Page 3: ...Response 18 Figure 10 Typical Sensor Response Versus Incidence Angle 19 Figure 11 Schematic of UVX Series Sensor 21 Figure 12 Measurement of Irradiance 21 Figure 13 Typical Output From Low Pressure Mercury Lamp 22 Figure 14 Hypothetical Light Source Having an Output at 270nm Wavelength 25 Figure 15 Response of Three Sensors Calibrated to Yield the Same Output at 254nm Wavelength 25 Figure 16 Conti...

Page 4: ...UVX Radiometer 4 Figure 1 Rear and Side Views of Radiometer ...

Page 5: ...onse and sensor field of view which users should understand to insure accurate measurements Refer to the Applications Techniques section of this manual which addresses these subjects Features The following is a list of features provided by the UVX Radiometer and Sensor Three sensitivity ranges covering the span from 200 µW cm 2 to 20 mW cm 2 3 1 2 digit liquid crystal display readout Sensitivity d...

Page 6: ...e Figure 10 Temperature Coefficient 0 04 C nominal 0 to 40 C Zero Drift 0 35 uW cm 2 C nominal 0 to 50 C Operating Environment Temperature 0 to 50 C Humidity 5 to 90 RH Operating Procedures The UVX Radiometer provides versatility and simplicity of operation The number of front panel controls has been held to a minimum Range changes are made by means of a three position range switch Access to the z...

Page 7: ...imals or colon is not turned on during that time refer to the Troubleshooting tips in this manual After the one second test mode is completed the circuit will automatically revert to the normal read condition At that time the meter should be zeroed to assure the best accuracy This is done by first covering the sensor so that no UV light strikes the sensor window Generally turning the sensor upside...

Page 8: ... then the optional attenuator must be used If however the reading contains less than three significant digits use a more sensitive scale or move the sensor closer to the source If a reading is obtained and it is desired to hold the reading change the position of the HOLD READ switch to the HOLD position This will hold the reading until the switch is returned to the READ POSITION In the event the b...

Page 9: ...circuitry operates through a C MOS chip to drive the appropriate decimal point as the range is changed Low Battery Voltage Circuit A low battery is detected by means of comparing a diode reference voltage to the trip point of an exclusive OR gate When the battery voltage decreases to less than 7 0v the colon will light up on the display HOLD READ Circuit The A D chip is equipped with hold function...

Page 10: ...r proper low battery voltage indication by reducing the supply voltage to 6 8 volts and see that the colon is fully on Then increase the supply voltage to 7 20V DC and see that the colon is completely off Return the supply voltage to 9 0 volts DC Place the range selector switch in the 200 uW cm 2 position While viewing the display adjust trimpot RV1 until the display shows 00 0 This completes the ...

Page 11: ...n back and forth with the pencil tip and watch the segment Performing this operation will generally correct all display segment malfunctions Colon does not turn on If the colon does not turn on during the test mode refer to the previous troubleshooting topic If the colon does not operate as a result of low battery voltage conditions then proceed as follows Disconnect the battery from the circuit a...

Page 12: ...tch from READ to HOLD The voltmeter should indicate the battery voltage while the switch is in the HOLD position If the voltmeter indicates the battery voltage and the display does not remain steady then the malfunction is in the integrated circuit A4 and it must be replaced If the voltmeter does not indicate the battery voltage then the malfunction is in the switch and the unit must be returned t...

Page 13: ...itch and the unit must be returned to UVP for repair In the event the input amplifier A1 the range changing switch and integrated circuit A4 are found to be functioning correctly then the malfunction is in the UVX sensor Note For direct traceability to NIST standards the sensor must be returned to UVP for repair and recalibration Refer to the section in the manual on Sensor Details ...

Page 14: ...UVX Radiometer 14 Figure 2 Radiometer Functional Block Diagram Figure 3 Radiometer Circuit Board Component Location ...

Page 15: ...UVX Radiometer 15 Figure 4 Calibration Current Source Figure 5 LCD Display Pin outs ...

Page 16: ...ed calibration wavelength Sensor Temperature Coefficient An added feature of the UVX Series Sensors is that special circuitry has been incorporated to reduce the temperature induced errors present in all solid state detectors The result is a sensor with a nominal overall temperature coefficient of only 0 04 C from 0 to 40 C Sensor Response Versus Incidence Angle The UVX Series Sensors incorporate ...

Page 17: ...UVX Radiometer 17 Figure 6 UVX 25 Sensor Solarization Curve Figure 7 Typical UVX 25 Sensor Spectral Response ...

Page 18: ...UVX Radiometer 18 Figure 8 Typical UVX 31 Sensor Spectral Response Figure 9 Typical UVX 36 Sensor Spectral Response ...

Page 19: ...h The absolute radiant incidence level from this source is set by simultaneously matching it with that of National Institute of Standards and Technology NIST standard of spectral irradiance This calibration is performed at UVP calibrations laboratory a minimum of once every six months The NIST standard of spectral irradiance used by UVP is a 1000 watt tungsten lamp This lamp is replaced after ever...

Page 20: ...ow be kept clean There are several ways of ensuring cleanliness To remove dust or dirt use a lens tissue or a cotton swab To remove fingerprints use a lens tissue or lint free cloth moistened with alcohol A high purity alcohol will ensure that no residue remains after the cleaning procedure General Precautions Handling The UVX Series Sensors although rugged should be protected from physical shocks...

Page 21: ...UVX Radiometer 21 Figure 11 Schematic of UVX Series Sensor Figure 12 Measurement of Irradiance ...

Page 22: ...UVX Radiometer 22 Figure 13 Typical Output From Low Pressure Mercury Lamp ...

Page 23: ...own in Figure 13 is commonly referred to as a line source In many applications the irradiance produced by this 254nm radiation is important and needs to be measured The UVX Radiometer using the UVX 25 sensor is the answer to this measurement problem because of two important factors One is that negligible radiation other than the 254nm wavelength occurs within the sensitivity wavelength region of t...

Page 24: ...Field of View and Distance Figure 17 shows two different sensors measuring the output from a lamp of extended length The sensor S 1 has a larger field of view or acceptance angle than the sensor S 2 Since it is radiant incidence that is being measured sensor S 1 will yield a larger output than S 2 because the emission from the total lamp length is being sensed Remember it is power incident upon th...

Page 25: ...UVX Radiometer 25 Figure 14 Hypothetical Light Source Having an Output at 270nm Wavelength Figure 15 Response of Three Sensors Calibrated to Yield the Same Output at 254nm Wavelength ...

Page 26: ...ere pointed directly toward the incident region Sensors that weigh their response in this manner are said to be cosine corrected The Polar Plot in Figure 19 has been drawn from the curve of Figure 10 to show how the UVX sensor compares to the perfect cosine response The sensor is identified by the broken curve in the figure The solid curve also shown identifies a perfect cosine response The UVX Se...

Page 27: ... reading Criteria for a Recommended Standard Occupational Exposure to Ultra Violet Radiation published by U S Department of Health Education and Welfare Public Health Service Document HSM 73 11009 and Practice for Occupational and Educational Eye and Face Protection published by the United States of America Standards Institute Document USAS Z 87 1 1968 These publications provide guidelines for max...

Page 28: ...UVX Radiometer 28 Figure 17 Example Illustrating Why Sensor Field of View is Important When Measuring Irradiance Figure 18 Projected Area of Sensor ...

Page 29: ...UVX Radiometer 29 Figure 19 Cosine Response of Typical UVX Sensor Polar Plot ...

Page 30: ...acitor 22uf 100V 10 polypropylene C6 52 0012 01 Capacitor 047uf 250V 10 C7 52 0004 07 Capacitor 1 uf 100V 10 C9 52 0013 01 Capacitor 100pf 500V 5 C10 52 0002 03 Capacitor 22uf 50V 80 to 20 C13 52 0001 02 Capacitor 10uf 16V 10 to 50 C15 C16 51 0007 02 Diode 1N914 CR1 CR2 51 0002 02 Rectifier 1 Amp 1N4001 CR3 51 0023 02 Transistor 2N4400 Q1 50 0012 08 Potentiometer Trimpot 20K 15 Turns RV1 50 0012 0...

Page 31: ...Radiometer PART NO DESCRIPTION COMPONENT DESIGNATION 51 0023 02 Transistor 2N4400 Q1 51 0029 01 Integrated Circuit OP07DP A1 A3 51 0028 01 Integrated Circuit 4030 A2 51 0030 01 A D Converter 3 1 2 Digit Single Chip A4 51 0031 01 Liquid Crystal Display D1 Note There are no replacement parts for the UVX sensors In case of damage or malfunction the sensor must be returned to UVP for repair and recali...

Page 32: ...ument or part thereof that has been subject to accident negligence alteration abuse or misuse by the end user Moreover UVP makes no warranties whatsoever with respect to parts not supplied by UVP or that have been installed used and or serviced other than in strict compliance with the instructions appearing in the operational manual supplied to the end user In no event shall UVP be responsible to ...

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