ThunderScientificPsy.. - Chicago Classic Computing
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1. the time shown on the upper display is incorrect follow the procedure on CHANGING THE TIME 2 Display the DATE with the following key strokes EE If the date shown on the upper display is incorrect follow the procedure on CHANGING THE DATE 3 Input the correct barometric pressure in inches of mercury For example pressure of 26 53 in Hg would be input with the following key strokes I Fed K lt K lt For more detailed information refer the section titled CHANGING THE PRESSURE 4 Turn on the aspirator with the following key strokes The motor should turn on and the left decimal point of the lower display should light um 5 Select the desired output with these key strokes Fue e e is one of the following Wr 1 2 Point Temperature 3 Air Temperature 4 Wet bulb Temperature 5 Resistance of Dry bulb in Ohms 6 Resistance of Wet bulb in Ohms 7 Time 8 Date 6 Once measurement is complete turn off aspirator with Take additional measurements by repeating steps 4 thru 6 IMPORTANT NOTE The fan mounted in the probe housing is designed with a maximum operating life of 300 hours The motor need not be run for more than 10 minutes before taking Temperature Dew Point or Relative Humidity Measurements PROGRAMMING THE SYSTEM FOR HARDCOPY OUTPUT n If a printer is conn2. THUNDER SCIENTIFIC CORPORATION ELECTRONIC PSXC HROMETER MODEL 4 1 RELATIVE HUMIDTY AND TEMPERATURE MEASUREMENT SYSTEM n OPERATING AND SERVICE MANUAL DATE June 17 1987 623 WYOMING S E ALBUQUERQUE NEW MEXICO 87123 TEL 505 265 8701 i u Xe IE JES Q mi DN 1 NS ION p Q Qc DA K x Ey SS M aX UN SCS IZ e Y 7 KORONO DARY ES 25 1 B N NY SSS gt BUE ST MN PN x SN M scors4oa SEEN NN sy mau 0 N SS 4 3 M e F j soour 6 M i 441 Z M WA DEMS PER 7 O MON J ffi X OR b A lt i lt Ds ih EE LITHO IN U S A 2 1 P EN LITHO IN U S A 3s VINEE SSTHUND SI i i N ASH EN NDER p S Pu NES RA 1 Ty A Z DM AA D E N IN Ez E YKUNA GOES 404 LITHO IN U S A TABLE OF CONTENTS PAGE WARRANTY 2 eos n SPECIFICATIONS FEATURES GENERAL DESCRI
3. wick is frozen to the sensor with deposits due to contaminated water DO NOT FORCE This will break the sensor leads causing expensive repair costs alcohol does not 1 the deposit return to Thunder Scientific Corporation for removal Thunder Scientific is not responsible for lead breakage and or sensor replacement 1 such occurs If wick changeout schedule is maintained this problem will not occur Apply finger cots supplied to the thumb and index finger of each Soak a clean cloth with alcohol and remove all traces of talcum from the outer surfaces If this is not done the wick becomes contaminated The replacement wicks are supplied in a sealed vial of alcohol Remove wick from the vial Using the blue taper tool provided push the wick onto the tool approximately one inch or more causing expansion by pushing on the wick Remove from tool and clip frayed end square Slide wick gently onto sensor and over the teflon to the shoulder Using the dropper apply several drops of water on the wick at the sensor Note wick expands slightly indicating water retention Gently form the wick around end of sensor and flatten between the sensor and wick tube to offer minimum wind resistance Feed wick thru teflon air sleeve slide sleeve over teflon Sensor mounts and seat it on the probe half Feed wick thru wick tube in bottom probe half and mate the probe halves Coil wick inside reservoir a
4. Battery backed up real time clock Timed printer output mode allowing user selectable intervals from 1 minute to 24 hrs in 1 minute increments Automatic Mode capability enables probe aspirator for 1 minute prior to each printout Full function display capability susceptible to contamination chemicals or long term exposure to high temperature and relative humidity Certification of Traceability direct to the National Bureau of Standards i CC GENERAL DESCRIPTION The Thunder Scientific Model 4 1 is microprocessor based Laboratory Standard Psychrometer designed for precise measurement of air temperature and relative humidity The 4 1 uses a 2 bulb measurement system employing wet and dry matched pair calibrated Platinum Resistance Thermometers PRT s operating under a controlled air velocity One PRT referred to as the dry bulb is used for sensing air temperature The other PRT the wet bulb uses a specially weaved wick or sock to facilitate an unimpeded capillary flow of distilled water froma reservoir below The wet bulb measures a depression temperature The signals from the PRT s are converted to digital format read by the microprocessor linearized and then converted to actual temperature data in both degrees C and degrees F The data is then used to calculate Percent Relative Humidity and Dew Point Temperature Front panel display of any of the above data is s
5. Connection to the probe should be smooth as excessive force could misalign and damage the connectors Connect the other end of the cable to the mating connector on the display panel Connection here should also smooth Connect printer optional to the multipin connector directly above the probe cable Connect the 6 foot AC power cable to the jack in the display panel and then to 120 VAC source Turn on the main power switch The upper display should show the time in military format with a blinking decimal point in the middle the seconds indicator The lower display should show 7 meaning Display Program 7 the time Push the LED TEST button and ensure that all segments and all 4 decimal points of each display light up TURN IS COMPLETE CC CO PROGRAMMING THE SYSTEM FOR MANUAL OPERATION o nw _ The 4 1 is versatile instrument and therefore requires some input from the user The user must perform at least the following minimum requirements to operate in manual mode Ensure the 4A 1 MP displays the correct time Ensure the 4A 1 MP displays the correct date Input the atmospheric pressure at the probe environment Turn on the aspirator motor Select the desired display ie Temp Dew Point RH etc Turn off the aspirator when measurements are complete ox Detailed descriptions follow 1 Display the TIME with the following key strokes fod
6. THUNDER SCIENTIFIC CORPORATION MAIN PRINTED CIRCUIT BOARD ASSEMBLY DRAWING AB80015 aft MO SCALI
7. You must type in all 4 digits including the decimal point For an explanation of the upper and lower display readings during this keyboard sequence refer to CHANGING THE HARDCOPY TIME INTERVAL 11 CHANGING THE The 4 1 contains battery backed up Real Time Clock The clock operates on a four year calendar meaning that it makes no adjustment for leap year Should it require setting for any reason refer to the below procedures To change the TIME follow the sample below This example changes the time to 3 40 3A SOOO Note that the time is input in MILITARY FORMAT and that no decimal point is needed between the hours and minutes For an explanation of the display readings during this keyboard sequence refer to CHANGING THE HARDCOPY TIME INTERVAL change the DATE follow the sample below This would change the date to June 4th ES ESTER Note that June was input as 06 and that the day was input as 04 Both digits of each must be typed 12 SWITCHING TO C F The 4 1 is capable of both C and F operation The user may at any time select which mode to use When switched all temperature displays including hardcopy output will be affected The temperature data sent to the hardcopy device will be followed by C or F as applicable To switch to C type the following keystrokes To swi
8. maximum run life It also provides for accuracy and repeatability of measurements as the motor is run for equal amounts of time prior to each and every printout To enable the Auto Mode type the following keystrokes Now anytime the printer is enabled see PROGRAMMING THE SYSTEM FOR HARDCOPY OUTPUT the probe will automatically turn on and off at the correct times Disable the Auto Mode function with the following key strokes The Auto Mode is now disabled and control of the aspirator is solely under user keyboard control The printer function is not affected Note Default interval is 1 minute between printouts This means that in the Auto Mode when the printer function is enabled the motor will stay on continuously unless the time interval is changed see CHANGING HARDCOPY TIME INTERVALS Note If the motor happens to be on when either the Auto Mode or the printer function is turned off from the keyboard by the user the aspirator motor may also need to be turned off in the same manner CHANGING THE INTERVAL The 1 is capable of Sending data to a printer or some other device such aS a computer at Specified time intervals The information Sent consists of Date Time Dry Bulb Wet Bulb and Dewpoint temperatures Relative Humidity and Saturation Vapor Pressure over water at the Dry and Wet Bulb temperatures A header is sent before the first line of data and every 2
9. 3 lines thereafter The time between each printout defaults to the minimum interval of 1 minute each time the system is turned on but is Keyboard selectable up to 24 hours To change the INTERVAL follow the sample below This example changes the interval to 1 hour 25 minutes but you Can use your own interval instead Note that the number on the lower display begins flashing when the SET key is pushed When the ENTER key is pushed the number Stops flashing indicating that the computer acknowledges the key and is now awaiting the interval input The interval numbers will appear on the upper display shifting the old numbers out to the left as the new numbers are punched in This same Procedure occurs for all SET commands ie Pressure Time and Date 10 C CHANGING THE PRESSURE The 4A 1 MP has been programmed from the factory with a barometric pressure of 29 92 inches of mercury in HG The instrument uses the barometric pressure for all calculations of Relative Humidity and Dewpoint temperature It is recommended that the absolute pressure be measured in the environment where the probe is to be set up and used The pressure should also be measured frequently during the operation of the system as the accuracy of the calculations can differ as much 2 RH for every inch of mercury To change the PRESSURE follow the sample below This example changes the pressure to 25 75 in HG
10. 6 15 10 L2 14 1 UT IS AN LED DRIVER SYSTEM 2 1 1 AND 12 ARE LED DISPLAYS 3 J1 IS A 14 PIN CONNECTOR SHOULD CONNECT WITH J3 OF MOTHER BOARD BY CABLE 4 ADD A 1 MF BETWEEN PIN 8 19 OF U1 THUNDER S 423 WYOMING 5 1 TOLERANCES UNI 7 OTHERWISE SPECIFIED FRACTIONS DEC ANGLES CIENTIFIC CORP ALBUQUERQUE NIW MEXICO 17111 NEW DISPLAY SCHEMATIC 5834130 U P 10311 PROBE 1 2 CABLE 1 2 MAINFRAME L dg Sv THUNDER SCIENTIFIC CORP S 13 WYOMING S t s ALMUQUIXQUI NEW MIXICO 87113 FRACTIONS DEC ANGLES MODEL 4 8 Exe jeu DRAWING NO s S83BI3I 1 lt lt I 1 I i U uror CRAPHICE ONC BALOROCA sae FEF ml ol i 5 E 999099900 00000000 00000000 60206000 2 4860015 ASSEMBLY DRAWING E icis 00 NOT SCALU DAAWING CENTRONICS SERIAL BAUO RATE LEKET scosese 9000909 16 16V COLON COMMON 6 voc SWITCHED 14V RETURN RETURN 414 VOC KEYSOARO
11. PTION PRE OPERATIONAL INSPECTION SET UP TURN ON PROCEDURES PROGRAMMING THE SYSTEM FOR MANUAL OPERATION HARDCOPY PRINTER OUTPUT AUTO MODE OPERATION x CHANGING THE HARDCOPY TIME INTERVAL doce Ged Gi 10 PRESSURE aS Bo ug tae ay e cfe dede RH da db Q S med TIME TQ Lat eene et auda RUN N ae Gs EN e MEE et Uh 7 DATE Loue De SP Geile satietas fy as SWITCHING TO Sun ee Gee Ga Gee X M Lou deese rath need eU quie SUMMARY OF COMMANDS DISPLAY FUNCTIONS 14 ON OFF FUNCTIONS sus 15 SET FUNCTIONS 4 acids M 26 PROBE WICK CHANGEOUT INSTRUCTIONS 17 FACTORY CERTIFICATION SERVICE e 19 a DRAWINGS M83C129 FRONT PANEL DETAIL 4 1 DE83C023 PSYCHROMETER PROBE DETAIL DRAWING S86D016 PSYCHROMETER SCHEMATIC DIAGRAM M 83A130 DISPLAY BOARD SCHEMATIC DIAGRAM E 5838131 PROBE AND CABLE WIRING DIAGRAM 3 CC WARRANTY Thunder Scientific Corporation warrants each instrument of its manufacture to be free from defect in materials and workmanship The limit of liability under this warranty is to repair or replace any part thereof which shall within one year after delivery to the original purchaser and returned by the or
12. ative to your instrument direct all correspondence to the Following address Thunder Scientific Corporation 623 Wyoming S E Albuquerque New Mexico 87123 Or call collect 505 265 8701 19 PRINTER COMPUTER INTERFACE OPTIONS There are three computer printer interface options currently available for the 48 1 MP Psychrometer Based Upon niich SBE ton your unit has the 25 pin output connector will match one of the below Listed pinouts 08 25 Trendcom Centronics RS 232 Pins Parallel Parallel Serial 1 Ground Strobe 2 Da 3 Di XMIT Data 4 D RTS 5 DB CTS 6 D4 DSR 7 DS 05 Ground 8 DS D6 07 07 ie gt Busy 13 14 Busy Ground 15 Ground 16 Ground 17 Strobe Ground 18 DQ Ground 19 D Ground eo D4 Ground DTR 21 D6 22 23 24 25 No special cables should be required Each of the output options are configured so as to make the proper connections with the peripheral device using only a flat ribbon cable and the appropriate insulation displacement connectors ie DB 25 36 pin Centronics 20 pin Dual Row IDC etc Interface cables are available from Thunder Scientific Corporation Serial option notes DB 25 pins 4 and 5 are tied together inside the 48 1 DB 25 pins 6 and 20 are tied together inside the 48 1 Either of these lines may be used a BUSY READY handshake line If handshaking is used the receiving device should be able to accept one more full characte
13. e for cleanliness Pay particular attention to the wick on the wet bulb If the wick requires changing see the section titled PROBE WICK CHANGE OUT INSTRUCTIONS 3 Inspect the main psychrometer unit Ensure the system is clean that all screws and connecting hardware are tightened and that all keys operate smoothly without binding or sticking 4 Inspect cables for wear Cables should be free from any nicks cuts or frays and all connectors should mate easily without binding C d iu NEL CAG 2 3 4 5 T 8 9 10 11 12 SYSTEM SET UP TURN ON PROCEDURES Remove the black probe housing from its styrofoam holder in the display panel This housing contains the Platinum Resistance Thermometers PRT s clean wick is installed from the factory on the wet bulb sensor To the rear of the housing is the aspirator motor which draws air over the PRT s Remove the knurled filler cap on the bottom of the probe housing Fill the reservoir with pure distilled water Never use tap water as this will contaminate the wick Replace the filler cap and finger tighten then gently shake excess water from inside the white probe cylinder Check for leaks around the bottom edge of the housing Finger tighten the knurled knob as necessary Place the probe in the environment to be tested and then route and connect one end of the white 12 foot power signal cable to the connector on the front of the probe housing
14. ected to the 4A 1 MP via the multipin connector on the display panel ardcopy outputs of all pertinent psychrometric data are available The following sequences are used to control the printer output Information is sent to the printer once each minute unless the user changes the time interval see CHANGING THE HARDCOPY TIME INTERVALS Turn on the printer function with the following keystrokes lt d Ww 1 The second decimal point from the left on the lower display should light Turn off the printer function with the following keystrokes n Le s The second decimal point should go out When using the printer the aspirator should also be turned on To enable and or disable the aspirator refer to the previous section on PROGRAMMING THE SYSTEM FOR MANUAL OPERATION Any one of the following printer computer interfaces are available 1 Trendcom compatible parallel 2 Centronics compatible parallel 3 RS 232C Serial 300 to 9600 Baud Consult TSC for your particular requirements C C p In Auto operation the aspirator motor function is automatic and is under computer control If the hardcopy output is enabled as previously described the computer will turn on the aspirator precisely 60 seconds prior to print time and will turn the motor off immediately after print This feature extends the service of the aspirator motor which has a 300 hour
15. elected by user input at the keyboard The upper display is the data readout device and the lower display indicates which data or other function is currently enabled Upon selection of data output to this real time LED display current readings are updated 4 to 5 times each second allowing for fast system response to any changes in the sampled environment Printer output enabled from the keyboard allows for hardcopy printouts of all current psychrometric data Printer output is at user selectable timed intervals ranging from a 1 minute minimum to a 24 hour maximum at any 1 minute increment in between An Auto Mode feature is also included which when enabled will put the probe in synchronous operation with the printer In this mode the probe aspirator will automatically run prior to any sample for hardcopy output After printout the aspirator Will be disabled and will remain off until the next sample time is reached The Model 4A 1 MP is a precise laboratory instrument and if handled accordingly will provide years of excellent service C VA PRE OPERATIONAL INSPECTION The 4A 1 MP Psychrometer is shipped from Thunder Scientific Corp TSC calibrated and basically ready for operation Any damage from shipment should be reported to TSC within one week of receipt Prior to each use the following inspection should be performed 1 Inventory Ensure all necessary parts and components are enclosed 2 Inspect the prob
16. iginal purchaser prove to be defective after examination by us This warranty specifically excludes the probe sensors which may become damaged or broken due to wick changes Shipping damage is covered by insurance and will be honored if report is made within one week of receipt of the instrument Warranty returns must be authorized by the factory WARNING Calibration seals have been applied to the instrument case cable and probe Should the instrument and or associated components be opened or tampered with or if the seals are broken Thunder Scientific Corporation accepts no responsibility for calibration and this warranty is void 1 MICROPROCESSOR BASED WET BULB DRY BULB PSYCHROMETER SPECIFICATIONS Relative Humidity RH Measurement Range 1 RH to 100 RH Guaranteed Accuracy 1 indicated RH Typical Accuracy 5 indicated RH Temperature Measurement Range 0 100 C 32 212 F Guaranteed Accuracy 3 5 F Typical Accuracy 1 C 2 F Readout C F user selectable pigital Display 01 and 01 Resolution Printer InterfFace Trendcom Parallel std Centronics Parallel opt RS 232C Serial opt Printer optional Trendcom 200 High Speed Intelligent Printer FEATURES Ge Nee 2 80 Central Processing Unit automatically computes percent relative humidity and both temperature and dewpoint in and F 3 computer printer interface options 2 parallel 1 serial
17. nd replace cover Replace four corner screws rubber feet and reservoir plug 18 cc CC FACTORY CERTIFICATION amp Factory certification is initially provided with each new instrument on a no charge basis Certification is good for one year or longer However the instrument should be recertified by the factory regular yearly basis This is done for a calibration charge of 200 00 per temperature and humidity point Generally three temperature and humidity points are sufficient If the instrument requires more than general cleaning a reconditioning charge of 150 00 is required NBS CERTIFICATION amp RECERTIFICATION If it is desired that the instrument be certified by the National Bureau of Standards NBS all NBS charges are passed net to the customer plus F O B charges to and from plus insurance coverage In the case of NBS certification Thunder Scientific Corporation does require that the instrument be shipped direct from Thunder to NBS and returned prior to shipment to the customer The same is required for recertification The instrument should be returned to Thunder Scientific for inspection and reconditioning prior to recertification by the Bureau kkkkkkkk SUMMARY Your Thunder Scientific psychrometer is a precise laboratory standard and should be treated accordingly Good maintenance will result in many years of service Should any problems or question arise rel
18. ntly pry reservoir cover with plastic tool and remove 4 Carefully remove the four housing retainer screws located in the corners of the probe They join the two halves of the probe 5 Gently remove bottom half of probe housing feeding the wick through the teflon wick tube Keep the teflon air sleeve in place during removal NOTE Blower motor is also loose once housing is removed 6 Lift teflon air sleeve up and off the sensor mounts taking care to Feed the wick through the air sleeve avoiding any lateral movement and undue strain upon the sensor 7 The sensor and wick are now in the open where the wick may be removed Using the dropper provided apply several drops of ethyl alcohol to the portion of the wick covering the sensor Allow to soak for approximately one minute replenishing the alcohol evaporation occurs 8 Using one of the picks provided gently probe the wick covering the sensor to loosen 9 Using the curved tweezers provided very gently push the wick up on itself or up on the sensor assisting with the other hand from the reservoir side The wick construction is very similar to a Chinese finger puzzle in that pushing tends to release it where pulling only 7 GG Ge 10 11 12 13 14 15 16 17 18 tightens the wick and compounds the problem of removal The wick should expand When this occurs use the tweezers to slide the wick from the sensor IMPORTANT
19. r in addition to the one Pete ERAT pen due to the double buffered nature of the UART used within the 40 1 Signals greater than 5 volts READY Signals greater than S volts BUSY If pins 6 and 20 are left unterminated READY is assumed RESERVOIR REMOVABLE COVER FOR ACCESS THREADED INSERT 500 DEEP 1 4 20 SCREW 4 PLCS RUBBER FEET 4 PLCS PRT ELEMENT PRT ELEMENT WET BULB DRY BuLB KNURLED KNOB FAN REMOVABLE AIRFLOW RESERVOIR 3 25 AIRFLOW 4 00 FRONT VIEW SIDE BOTTOM VIEW THUNDER SCIENTIFIC CORP 813 WYOMING 5 1 ALBUQUERQUE NEW MEXICO 87123 PSYCHROMETER MODEL 4 POL LETTURE LL c TU XC NEMO CIE BS e peer NM NOI1YHOdHOO 1 9 ELITS x H LI rj 1 i 252 13 sog 3 4323 21175 358i 3 zd OT 1 S 311N3ID9S jane jae boi 4522 Hm Jn gm nm m dm m ym O0 2 32 p 125i 922 beads d 1 Q g or il 92771 x n 2 ta REVISIONS _ DESCRIPTION APPROVED 2 24 q 26 4 517 Boe 3 13 I2 I
20. tch to F type these keystrokes NOTE The power up default mode is F 13 OG O SUMMARY OF DISPLAY COMMANDS AE JE ES e OE E e Ee Relative Humidity Dewpoint Dry Bulb Wet Bulb Wet Bulb Time Date 14 Temperature Temperature Temperature Resistance in Ohms Resistance in Ohms ee ee SUMMARY OF ON OFF COMMANDS To AE AG OIL Funo 2 PRO Enable Auto Mode Disable Auto Mode Turn Probe ON Manually Turn Probe OFF Manually Enable Printer Output Disable Printer Output Switch to C Switch to F 15 Bu SUMMARY OF SET COMMANDS E E ESTE EIE ES e LEE JE EE s 16 Interval Time Date CC CC PROBE WICK CHANGEOUT INSTRUCTIONS The 1 Wick Changeout Kit is provided to easily change wicks in the sensing probe Wick changes should be performed after forty hours of operation more often particularly if the instrument is in a dirty environment A replacement wick supply Should be ordered from Thunder Scientific Corporation in advance of the need and kept on hand Order PW 101 Probe Wick 10 00 each Suggested Stock 25 Minimum Order 50 00 Albuquerque New Mexico 87123 1 Place probe upside down upon two blocks of wood or other material one on each side of the probe handle 2 Remove reservoir plug and rubber feet 3 Ge
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