MANUAL M340 Blackbody Calibration Source
Confidential Information The material contained herein consists of information that is the property of LumaSense Technologies and intended solely for use by the purchaser of the equipment described in this manual. All specifications are subject to change without notice. Changes are made periodically to the information in this publication, and these changes will be incorporated in new editions.
Contents 1 General Information...................................................................................................... 5 1.1 Information about the user manual..................................................................... 5 1.1.1 Legend ................................................................................................................. 5 1.2 Safety ..................................................................................................................... 5 1.2.
6.5 Heater Element Replacement ............................................................................. 19 Appendix A: PC Communications sample ........................................................................ 21 Appendix B: Calibration Methods .................................................................................... 23 Emissivity ..................................................................................................................... 24 Appendix C: CE Certification ......
1 General Information 1.1 Information about the user manual Congratulations on choosing the high quality and highly efficient Mikron blackbody. This manual provides important information about the instrument and can be used as a work of reference for installing, operating, and maintaining your blackbody. It is important that you carefully read the information contained in this manual and follow all safety procedures before you install or operate the instrument.
1.3 Limit of Liability and Warranty All general information and notes for handling, maintaining, and cleaning this instrument are offered according to the best of our knowledge and experience. All Mikron blackbodies from LumaSense Technologies have a regionally effective warranty period. Please check our website at http://info.LumaSenseinc.com/warranty for up-to-date warranty information.
Email: eusupport@LumaSenseinc.com 1.6 Shipments to LumaSense for Repair All RMA shipments of LumaSense Technologies instruments are to be prepaid and insured by LumaSense assigned shipper. For overseas customers, ship units air-freight, priority one. The instrument must be shipped in the original packing container or its equivalent. LumaSense Technologies is not responsible for freight damage to instruments that are improperly packed.
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2 Introduction 2.1 Description The M340 is a portable blackbody calibration source utilizing a digital indicating temperature controller that may be set to any temperature between -20 °C to 150 °C (-4 °F to 300 °F). A precision RTD temperature sensor is embedded in the blackbody emitter providing high accuracy and repeatability. The temperature controller uses the industry standard PID algorithms to control the emitter temperature to within +/-0.1 °C.
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3 Installation 3.1 Normal use (20 °C to 150 °C and occasional short term from 0 °C to 20 °C) Normal use means that for most occasions, the M340 will be set to temperatures above ambient or about 20 °C to 150 °C. No purge gas installation is required. Notice on the rear panel, there is a connection for DRY N2 PURGE.
is tight around these openings, ensure that the air leaving the outlet does not have a path to the inlet (fan). This will cause the cooling/heating system to be inefficient and prevent achieving the extreme setpoints. This would be similar to running a room air conditioner without installing it in a window! 3.6 Line Voltage Read the specification label on the rear panel to ensure the AC LINE voltage you are about to use matches the voltage on the M340 label (100 or 115 or 230 VAC). 3.
4 Operation 4.1 Power ON 1. Allow the M340 to warm-up to room temperature for at least two hours after unpacking and prior to applying power to remove any condensation. 2. Connect the power cable to a VAC service that matches the power requirement specification noted in the Technical Data section and on the Specification Label located on the rear of the M340. 3. Power the M340 by turning on the power switch. The upper RED display is the current emitter temperature.
Note: It is important to lock out the controller after making setting changes to prevent tempering. To lock out the controller: 1. Press to enter setup again 2. Press until 01 appears in lower display 3. Press to exit, the controller is locked out 4.4.2 Using Serial Communications Your serial communication package (not supplied) may require some settings that are different from how the M340 was shipped. To change temperature units: 1. Press and hold for 5 seconds 2.
Available Communication Settings Display Baud Rate Parity Data Bits Stop Bits 3.o.7 300 odd 7 2 6.o.7 600 odd 7 2 12.o.7 1200 odd 7 2 24.o.7 2400 odd 7 2 3.n.8 300 none 8 1 6.n.8 600 none 8 1 12.n.8 1200 none 8 1 24.n.8 2400 none 8 1 4.4.3 PID Tuning Constants The PID tuning constants have been factory set for optimum performance. Altering these parameters will void the warranty and will require assistance from LumaSense to restore it.
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5 Communications Port 5.1 RS232C This blackbody may have the option to communicate with the temperature controller via a PC or similar device. The DB-9 male connector is on the rear panel. Wiring is shown below. It is wired to operate with a standard through cable (not null modem). This method allows bi-directional data transfer via a three conductor cable consisting of signal ground, receive input and transmit output.
RS485 wiring The blackbody was shipped with the controller set at the following com port parameters: Baud: 1200 Data Bits: 7 Stop bits: 1 Parity: odd To alter these parameters, see Section 4.4. 5.3 Communication Command Set The complete command set is extensive. For the purpose of brevity, only a few important ones are shown here. For more information, the controller instruction manual may be requested from LumaSense.
6 Maintenance 6.1 Emitter Life The life expectancy of the cavity depends on the time and temperature of operation. The higher the temperature, the shorter the life span. At temperatures near the upper end of the range, the life expectancy is shortened by approximately 30%. Do not try to clean the emitter surface. 6.2 Periodic Inspections Check periodically and upon every start up the following items: 1. Unusual noises and smells when applying power. 6.3 Fuse Locations The M340 has one or two fuses.
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Appendix A: PC Communications sample This is a typical QBASIC program that reads current temperature and increments setpoint at 10C intervals: This program is provided for example only for extraction of code lines for your use. It is not intended to be an attractive user interface program. It is, however, a working program. 'ATHNSET.BAS RS232 mgm 12/11/97 rev 1/9/98 mgm added switch for no decimal CLS OPEN "COM1:1200,O,7,1,RS,CS,DS" FOR RANDOM AS #1 'uses com1 12.o.
NEXT y '-------get blackbody temperature readings PRINT #1, reading$ ' send get reading command string to controller INPUT #1, getread$ ' ignore first controller response (echo) INPUT #1, getread$ ' grab controller temperature response pv = VAL(RIGHT$(getread$, readlen)) 'convert ascii string to a number '-------display the process variable (blackbody temperature) LOCATE 7, 15 COLOR 4 + 8 PRINT pv '-------escape loop to end program mg$ = INKEY$ IF mg$ = " " THEN CLOSE : END '--------wait some time FOR z = 0
Appendix B: Calibration Methods There are two distinctly different methods of calibration, each with its own application advantages. These methods are described as follows: Thermometric Method: In this method, the surface temperature of emitting surface is precisely measured and controlled. The sensor is an ultra precision platinum RTD that closely monitors the temperature of the emitting surface.
Emissivity When measurements are required at wavelengths other than the one used for factory radiometric calibration, or if the calibration was done thermometrically (see above), the graph below provides emissivity vs. wavelength for this model. Integrating over the wavelength region of interest will provide the average emissivity for your measurement. If the blackbody was calibrated radiometrically, the apparent emissivity at 8-14um was normalized to 1.0.
To force the radiance output of a thermometrically calibrated blackbody to desired temperature, simply invert the sign of the ERROR DEG.C and add this number to the blackbody controller setpoint. Again, note that this only applies at ambient and background temperatures of 23 °C. Calibrating fixed emissivity pyrometers To use this blackbody to calibrate pyrometers (infrared thermometers) that are factory set at 0.
Background Influence On Apparent Emissivity When using a blackbody source at temperatures near ambient and above, common sense dictates how the blackbody will behave. When using a source below ambient temperatures, different things happen. Since the background such as the room, wall, and you are warmer than the blackbody emitter, the energy emitted from the emitter is the sum of the background reflection and the emitter temperature. When emitter emissivity is less than 1.
Appendix C: CE Certification M340 Manual Appendix C: CE Certification 27
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Index A Apparent Emissivity 26 B Background Influence 26 C Cavity life 19 Cleaning 19 Communication Command 18 Communications Port 17 D Dimensions 10 Disposal 7 F Fuse Locations 19 G General Information 5 H Heater Element 19 I Inspections 19 L Legend 5 Liability 6 M340 Manual Location 11, 12 M Maintenance 19 P Packing 7 R Repair 6, 7 RS-232C 17 RS-485 17 S Safety 5 Serial Communications 14 Service Request 6 Setpoint 13 Storage 7 Support 6 T Technical Data 9 Temperature Units 13 Transport 7 U
M340 Manual Index 30
