User`s Manual - Buck Research Instruments LLC
Contents
1. Cabinet of VAPORTRON unit too cold Allow system to run in the power on only no control for a period of time Hygroscopic load Some materials have TREMENDOUS water capacity in the vapor phase eg Nylons PVC plastics and woods etc Remove suspect material NO CONTROL L1 L2 PUMP LEDS LIT BUT NO REGULATION Possible Cause Suggested Action CONTROL switch not activated Check that it is pressed on Electronic failure Consult technical documents or the factory 19 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series WATLOW CONTROLLER OPTION series 965 How to Use the Keys and Displays The new Vaportron H 100B configuration now uses digital process controllers PID s for BOTH temperature and relative humidity The setpoints and actual chamber values are displayed in the lower and upper LED readouts respectively Upper Display L1 Red or green 0 3 8 mm high seven segment RED Actual temperature 9C GREEN Actual RH 96 Lower Display RED Setpoint 9C GREEN Setpoint RH 96 Setpoints are active when the H 100L control switch is on oom SERIES 965 Mode Key Unused for Vaportron H 100BL Up Arrow Key Increases the value of the displayed setpoint A light touch increases the value by one Holding the key down increases the value at a rapid rate New data is self entering in five seconds WATLOW gt ROCESS2. NOTWITHSTANDING ANY OTHER PROVISION OF THIS CONTRACT NO OTHER WARRANTIES WHETHER STATUTORY OR ARISING BY OPERATION OF LAW EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THOSE OF MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE SHALL APPLY TO THE GOODS OR SERVICES PROVIDED HEREUNDER OTHER THAN THE REPAIR AND REPLACEMENT WARRANTY ABOVE SELLER SHALL IN NO EVENT BE LIABLE TO BUYER OR ANY THIRD PARTY FOR ANY DAMAGE INJURY OR LOSS INCLUDING LOSS OF USE OR ANY DIRECT OR INDIRECT INCEDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND 30
3. 9 370 11 984 6 309 8 038 8 814 12 437 5 849 L 9 568 10 247 12 879 6 257 9 787 10 669 13 310 6 654 11 080 13 731 11 483 14 141 11 876 14 543 12 250 14 935 12636 15 319 13 004 15 695 13 364 16 063 13 717 16 423 14 063 16 776 14 402 17 123 14 735 17 463 15 061 17 787 15 382 18 124 15 697 18 446 16 007 18 763 16 311 19 072 16 610 19 379 16 905 19 680 17 194 19 976 17 479 20 267 17 760 20 554 18 0236 20 836 18 308 21 114 18 576 21 389 18 840 21 658 79 101 21 924 19 358 22 196 19 611 22 445 19 961 22 701 20 107 22 953 20 350 za 201 20 590 23 446 20 827 23 689 21 061 23 928 21 293 21 521 24 397 21 746 21 969 22189 22 407 22 622 22 835 23 045 23 253 23 459 23 663 23 864 24 063 8 8 8 8 80 0 8 888588885 241 42 43 44 45 46 47 48 49 50 28883882889 2388388288 8 4333333483 24 456 24 649 358858 88 5 5 25 403 25 5898 25 770 25 950 2882 TABLE OF RELATIVE HUMIDITY VS DEWPOINT at 1 RH STEPS IN DEGREES F AIR TEMPERATURE 68 F 69 8 F 71 6 F 73 4 F 75 2 F 77 F 78 8 F 80 6 F 82 4 F 84 2 F 86 F amp RH DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT 1 66 0 49 0 68 1 85 3 01 4 17 MOST COMMON 5 33 6 48 7 64 8 79 9 93 1 83 3 01 4 20 5 39 6 57 7 75 USE RANGE 8 92 10 09 11 26 12 43 13 59 4 80 6 02 7 22 8 42 9 62 10 81 FOR 12 00 13 19 14 37 15 56 16 73 7 43 8 65 9 86 11 08 12 29 13 50 OPERATION 14 70 15 90 1
4. MASK NIOSH OSHA APPROVED FOR DUST VENTILATION TO MEET TLV REQUIREMENTS EYES SAFETY GLASSES OR GOGGLES OTHER PROTECTIVE EQUIPMENT GLOVES OR PROTECTIVE CLOTHING ARE NOT USUALLY NECESSARY BUT MAY BE DESIRABLE IN SPECIFIC WORK SITUATIONS SECTION IX REFERENCES U S DEPARTMENT OF LABOR OSHA FORM APPROVED OMB NO 1218 0072 OSHA HAZARD COMMUNICATION STANDARD 29 CFR 1910 1200 U S GYPSUM CO amp SOGEM AFROMET INC Although the information and recommendation set forth herein are presented in good faith and believed to be correct as of the date hereof the W A Hammond DRIERITE Co makes no representation as to the completeness or accuracy thereof Information is supplied upon the condition that the person receiving same will make their own determination as to its suitability for their purpose prior to use In no event will the W A Hammond DRIERITE Co be responsible for damages of any nature whatsoever resulting from the use of or reliance upon information herein supplied No representations or warranties either expressed or implied of merchantability fitness for it particular purpose of or any other nature are made hereunder with respect to information or the product to which information refers 25 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series BUCKRESEARCH INSTRUMENTS L L C CERTIFICATE OF CONFORMANCE Customer Name Model Serial 2K 0104 TD100XXXXX VAPORTRON Hygroclip S 11XXXX Date 05
5. file INSTALLED OPTIONS Available in BL or CL version 230VAC 50Hz option standard is 110VAC 60Hz CiS dew point sensor with LCD readout and output LCD dew point display from Rotronic Sensor VAPORTRON ACCESSORIES AND SUPPORT ITEMS DRIER H 100 DOOR OSTD 2001 1 DOOR 2 SPARES H 100 MAN DOOR ESP Heavy duty 3 8 machined polycarbonate door with face o ring seal and thumbscrew lockdowns blank no holes clear DOOR ESP 4 Same as above with 4 drilled ports at 12 25 mm dia clear customer specify each port diameter at order placement RECAL NVLAP certified calibration with documents 29 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series APPENDIX 3 WARRANTY Manufacturer warrants that the items delivered shall be free from defects latent and patent in material and workmanship for a pertod of one year after acceptance of the specific goods by Buyer The Buyer s sole and exclusive remedy under this warranty shall be limited to repair or replacement Defective goods must be returned to the Manufacturer promptly after the discovery of any defect within the above referenced one year period Transportation expenses to return unit to Manufacturer shall be borne by the Buyer Return shipping to Buyer shall be borne by Manufacturer for valid warranty claims This warranty shall become inapplicable in instances where the items have been misused or otherwise subjected to negligence by the Buyer
6. L1 Cooling L1 Moistening Air L2 Heating L2 Drying Air MN Note Not used in normal operation f Down Arrow Key Decreases the value of the displayed setpoint A light touch decreases the value by one Holding the key down decreases the value at a rapid rate New data is self entering in five seconds 20 Lit when in Manual operation mode To enter Automatic oper ation press the A M key twice While blinking pressing the A M key toggles between Auto and Manual After five seconds LED stops blinking and returns to its previous state A M Key Pressed once it clears any latched alarms and toggles between Auto and Manual mode If pressed again within five seconds it will change from Auto to Manual or vice versa While in Manual mode percent power is in the lower display Buck Research Instruments LLC VAPORTRON H100BL H100CL Series WATLOW CONTROLLER OPTION Series 96 How to Use the Keys and Displays The new Vaportron H 100C configuration now uses digital process controllers PID s for BOTH temperature and relative humidity The setpoints and actual chamber values are displayed in the lower and upper LED readouts respectively LI L1 Cooling L1 Moistening Air Upper Display Red or green 0 3 8 mm high seven segment RED Actual temperature C GREEN Actual RH Lower Display RED Setpoint C GREEN Setpoint RH Setpoints are active when the H 100L c
7. gases by weighing the complete assembly 9 Applications in chromatography 22 2 3 4 5 7 Buck Research Instruments LLC VAPORTRON H1I00BL H100CL Series SPECIFICATIONS Column is molded acrylic plastic Dimensions 256 O D x 1146 Anodized aluminum cap is fitted with O Ring gasket Safe for working pressures to 90 psig Desiccant supports and coil spring are of cadmium plated steel DRIERITE is held firmly in place between felt filters Connections are for rubber tubing Tubing should be held with hose clamps when used under pressure Filled with approximately 114 lbs of 8 mesh Indicating DRIERITE 9 Capacity for water vapor up to 50 grams 11 12 Flow rate should be 200 liters per hour or 0 1 scfm for maximum efficiency Air and gases dried to 100 F dew point Indicating DRIERITE is non toxic and non explosive REGENERATION DRIERITE granules snould be removed from ihe column and spread evenly one granule deep on a tray Heat for one hour at about 20 O C or 400 The desiccant should then be cooled in a tight container before refilling the acrylic unit Felt filters should also be pre dried at 100 C for about 30 minutes before assembly Specify the acrylic model of the LABORATORY GAS DRYING UNIT For Sale by the Manufacturer and LEADING LABORATORY SUPPLY DEALERS UNITED STATES AND CANADA BULLETIN NO 00 W A HAMMOND DRIERITE COMPANY 138 DAYTON
8. in this configuration The temperature output of the temperature sensor in the Rotronic probe is amplified and scaled to degrees celcius ranges and is available at the rear panel as a recordable analog output The range is 0 5 V for 0 to 100 C Buck Research Instruments LLC VAPORTRON H100BL H100CL Series VAPORTRON MODEL H 100 BL PID temperature controller THERMAL Watlow 965 series DESIGN DRAWING CH 1 cool CH 2 heat Temperature Range Peltier Hexfet power heat pump switch array 15 Watts Quadfet array with auto heat cool logic all solid state fluidless 2 liter 4 humidity workspace chamber cabinet ht exch ht exch I fan 1 2 fan Figure 3 Thermal design concept diagram for VAPORTRON Buck Research Instruments LLC VAPORTRON H100BL H100CL Series Humidity Control System The VAPORTRON humidity control scheme is essentially a reference based closed loop servo demand flow network see Figure 4 After being thermally stabilized by the system described in Figure 4 the working volume 2 0 Liters is essentially a continuously stirred constant temperature atmosphere The present relative humidity is sensed by a high grade fast response polymer type reference sensor located approximately in the center rear third of the chamber The RH signal is compared by an error amp processor inside the RH PID controller to its LED indicated set point command as input by the user VAPORTRON H 100 B
9. 0 12 974 12 298 11 624 10 951 10 280 OPERATION 9 611 8 943 8 277 7 613 6 950 12 350 11 670 10 988 10 307 9 627 8 949 25C 8 273 7 599 6 926 6 255 5 586 11 180 10 493 9 804 9 117 8 432 7 748 7 065 6 385 5 706 5 029 4 353 10 120 9 419 8 725 8 032 7 341 6 651 5 963 5 277 4 592 3 909 3 228 8 130 8 431 TM 7 033 8 337 5 642 4 949 4 257 3 567 2879 2 193 8 220 7 516 6 811 6 108 5 406 4 707 4 009 3 312 2 618 1 924 4 233 7 370 5 662 5 953 5 245 4 539 3 835 3 132 2 432 1 732 1 035 0 339 6 580 5 863 5 149 4 437 3 0186 2312 1 606 0 903 0 201 0 565 5 830 5 110 4 393 3 677 2 963 2 250 1 539 0 830 0 661 1 461 5 120 4 400 3 679 2 959 1 524 0 810 0 096 0 697 1 503 2309 4 450 3 727 3 002 2278 0 836 0 118 0 678 2302 3 113 3 820 3 087 2 358 1 631 0 183 0 611 1 429 3 063 3 879 3 210 477 1 745 1 015 A 8 0 499 1 322 2 145 3789 4 610 2630 1 894 1 159 0 425 1 175 2003 2631 4 484 5 910 2 080 1 336 0 598 0 156 L 1 823 2656 3 488 5 981 1 540 0 800 0 059 0 770 E 2 446 3 283 4 119 e 6 625 1 030 0 286 1 361 3 045 3 886 4 727 5 7 245 0 540 0 237 1 084 1 931 3 623 4 468 5312 7 842 0 060 0 779 1 630 2481 5 029 5 878 8 419 1 303 3 012 5 572 6 424 8 977 0 850 1 810 2 668 3 526 6 097 6 953 9 516 1 440 2301 4 025 6 606 7 465 10 039 2778 3 643 4 508 7 099 7 962 y 10 546 3 240 4 977 8 444 11 039 3 690 4 562 5 433 y 8 044 8 913 11 518 5 002 5 877
10. 03 2006 NIST TRACEABLE CUSTOMER UNIT STANDARD RH RH DIFFERENCE S AS SAD 11 4 11 0 0 4 RH 1 5 RH 32 7 32 2 0 59 RH 1 5 RH 48 2 48 4 0 2 RH 1 5 RH 57 7 58 0 0 3 RH 1 5 RH 75 3 74 5 0 8 RH 1 5 RH 84 2 83 2 1 0 RH 1 5 RH NIST TRACEABLE CALIBRATION EQUIPMENT Humidity Standard Manufacturer Model Cal Due Serial Buck Research Instruments CR 3 2 1 2006 301 Temperature Standard Manufacturer Model Cal Due Serial Logan PlatinumRTD 3 15 2006 9251 12 Voltage Standard Manufacturer Model Cal Due Serial Agilent 34401A 5 27 2006 US36112687 Hewlett Packard 34401A 5 27 2006 US36043947 Pressure Standard Manufacturer Model Cal Due Serial Druck DPI 740 2 12 2006 740 01260 TESTED BY PO Box 19498 Boulder CO 80308 main 303 442 6055 fax 303 443 2986 1 800 HUMIDITY WWW HYGROMETERS COM 26 ABLE OF RELATIVE HUMIDITY VS DEWPOINT at 1 RH STEPS IN DEGREES C AIR TEMPERATURE 20 C 21 C 22 23 246 25C 26 27 28 29 30 C RH DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOINT DEWPOIN 18 700 18 048 17 398 16 750 16 104 15 459 MOST COMMON 14 816 14 175 13 535 12 897 12 260 16 760 16 103 15 444 14 786 14 129 13 475 USE RANGE 12 821 12 170 11 520 10 872 10 226 15 110 14 438 13 708 13 101 12436 11 773 FOR 11 111 10 451 9 793 9 138 8 481 13 65
11. 7 10 18 30 19 49 9 77 10 09 13 45 14 67 15 89 77 17 11 18 32 19 53 20 74 21 95 11 68 13 11 15 59 16 82 18 05 19 28 20 51 21 73 2295 24 16 13 78 15 05 17 54 18 79 20 03 21 27 22 50 23 73 24 96 26 19 1557 16 82 19 34 20 59 21 84 2309 24 34 25 58 26 82 28 05 17 20 18 47 21 01 22 27 23 53 24 78 26 04 27 29 28 54 29 78 18 73 20 01 22 56 23 83 25 10 26 36 27 62 28 88 30 14 31 39 20 16 21 45 24 01 25 29 26 57 27 84 29 11 30 37 31 64 33 02 21 51 22 80 25 38 26 67 27 95 29 23 30 51 31 78 33 19 34 63 2278 24 08 26 67 27 97 29 26 30 54 31 85 33 25 34 71 36 16 23 99 25 29 27 90 29 20 30 50 31 79 33 22 34 68 36 14 37 60 25 12 26 44 29 06 30 37 31 67 33 10 34 57 36 04 37 51 26 22 31 49 31 10 34 38 35 86 38 82 27 27 28 59 32 62 34 12 35 61 37 10 38 58 40 07 28 26 29 60 33 78 35 28 36 78 38 28 41 27 29 23 34 89 36 40 37 91 39 41 40 92 42 42 40 51 42 02 43 53 38 52 41 56 43 08 44 60 39 52 42 58 43 56 46 63 44 52 45 44 48 53 46 33 47 20 50 32 48 04 52 00 52 53 54 55 56 57 5a 59 60 38893882882 AIIN 5 5 5 5 8 5 5 8 86 518 8 8238 55 5 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series PRODUCT LISTING TABLE TOP HUMIDITY LABORATORY VAPORTRON H 100 SERIES line powered portables 115 230V 50 60HZ H 100BL Basic unit with manual set points and no computer interface RH range of 3 95 RH 10 to 60 Deg C H 100CL Advanced unit with manual computer interface and PC operated ramp amp soak with logging to disk
12. APORTRON H100BL H100CL Series The VAPORTRON stabilizes to a new RH value from 10 to 100 times faster than most salt derived methods The benefit of this is that the product of calibration throughput and final accuracy is greatly enhanced In addition due to the speed of generation it is possible and normally expected in metrology practice to provide an as found as left record of sensors tested so that post deployment corrections can be applied if needed to the sensor data One other advantage is that especially through automated ramp and soak option it is easier to identify faulty or non linear sensor output and deal with it BEFORE a lot of personnel time is wasted on attempting calibration of a malfunctioning sensor RECOMMENDED CALIBRATION PROCEDURE OR TRIAL RUN For a typical as found or exploratory run we advise to start at low RH typically 20 or 30 RH Allow the Devices Under Test DUT s to sit in the VAPORTRON chamber for 2 minutes for every Deg C difference between room temperature in the lab and the VAPORTRON chamber temperature As a rule of thumb 5 minutes is usually enough at low RH Once the temperature is fully stable use the readings of the DUT s temperature output if available follow the procedure below 1 Note or log sensor readings at the low RH 2 Command a mid range RH value of 50 RH and after 5 minutes minimum and record sensor readings 3 Command a high scale or span check of 70 to 8096 RH
13. AVENUE XENIA OHIO 45385 513 376 2927 23 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series MATERIAL SAFETY DATA SHEET IDENTITY INDICATING DRIERITE DATE PREPARED 7 9 96 DESCRIPTION 1 16 TO 1 4 BLUE GRANULES SECTION I MANUFACTURER S NAME W A HAMMOND DRIERITE CO LTD ADDRESS P 0 BOX 460 138 DAYTON AVE XENIA OH 45385 EMERGENCY PHONE NUMBER 513 376 2927 INFORMATION PHONE NUMBER 513 376 2927 SECTION II INGREDIENTS CHEMICAL IDENTITY OSHA PEL ACGIHTLV UNITS C A S CALCIUM SULFATE 97 15 10 mg m3 7778 18 9 COBALT CHLORIDE 3 0 05 0 05 mg m3 7646 79 9 AS COBALT METAL HAZARDOUS MATERIALS IDENTIFICATION SYSTEM HMIS HEALTH FLAMMIBILITY REACTIVITY PROTECTIVE EQUIPMENT 1 0 1 E SECTION III PHYSICAL CHEMICAL CHARACTERISTICS SPECIFIC GRAVITY H20 1 1 87 SOLUBILITY IN WATER 0 25 GRAMS PER LITER MELTING POINT 1450 C DECOMPOSES APPEARANCE BLUE GRANULES NO ODOR SECTION IV FIRE AND EXPLOSION HAZARD DATA FLASH POINT NONE EXTINGUISHING MEDIA NOT COMBUSTIBLE SPECIAL FIREFIGHTING PROCEDURES NONE UNUSUAL FIRE AND EXPLOSION HAZARDS NONE SECTION V REACTIVITY DATA STABILITY STABLE INCOMPATIBILTY MATERIALS TO AVOID STRONG ACIDS HAZARDOUS DECOMPOSITION BYPRODUCTS CL AT 318 S0 1450 C HAZARDOUS POLYMERIZATION WILL NOT OCCUR SECTION VI HEALTH HAZARD DATA EYES PARTICLES MAY CAUSE IRRITATION SKIN THIS MATERIAL IS NOT TOXIC MAY DRY OR IRRITATE SKIN INHALATION MAY CAUS
14. BUCKRESEARCH INSTRUMENTS L L C VAPORTRON H100BL H100CL Series Precision Humidity Lab Users Guide January 2012 BUCK RESEARCH INSTRUMENTS LLC PO Box 19498 pir a CO 803 2012 Buck Research Instrume nts ES a rights reserved Buck Research Instruments LLC VAPORTRON H100BL H100CL Series Table of Contents 1 INTRODUCTION Overview Specifications 2 THEORY OF OPERATION Philosophy of Design Relationship Between Dewpoint and Relative Humidity 3 INSTRUMENT DESCRIPTION Thermal Control System Humidity Control System 4 SETUP AND VERIFICATION 5 USE AND CALIBRATION General Practices Calibration Calibration of Sensors and Transmitters with the VAPORTRON Recommended Calibration Procedure or Trial Run Sensor Response Analysis Sensor Transmitter Adjustment Procedure Special Low End Trim Other Guidelines Operating at High Relative Humidity Desiccant Drier Cartridge Service Water Reservior Check and Water Service Procedure 6 TROUBLESHOOTING Chamber Too Moist or Too Dry Chamber Too Moist No Control Chamber Too Dry No Control No Control L1 L2 Pump LEDs Lit gt gt gt gt 09 O tS S Q Q Q O Un APPENDIX Watlow Controllers 20 Material Safety Data Sheets 22 Sample Certificate of Calibration 26 Humidity Related Tables 27 Product Listing 29 Warr
15. E AN IRRITATION OF RESPIRATORY ORGANS OF SENSITIVE PERSONS RESULTING IN THE OBSTRUCTION OF AIRWAYS WITH SHORTNESS OF BREATH INGESTION MAY CAUSE VOMITING DIARRHEA AND SENSATION OF WARMTH SIGNS AND SYMPTOMS OF OVER EXPOSURE EYE NOSE THROAT OR RESPIRATORY IRRITATION 24 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series CARCINOGENICITY OF INGREDIENTS MATERIAL IARC NTP OSHA CALCIUM SULFATE NOT LISTED NOT LISTED NOT LISTED COBALT CHLORIDE YES NO NO COBALT amp COBALT COMPOUNDS ARE CLASSIFIED AS GROUP 2B MEDICAL CONDITIONS GENERALLY AGGRAVATED BY EXPOSURE PRE EXISTING UPPER RESPIRATORY AND LUNG DISEASE SUCH AS BUT NOT LIMITED TO BRONCHITIS EMPHYSEMA amp ASTHMA EMERGENCY AND FIRST AID PROCEDURES EYES FLUSH WITH WATER IF IRRITATION CONTINUES OBTAIN MEDICAL ATTENTION DUST INHALATION REMOVE TO FRESH AIR SKIN WASH WITH WATER INGESTION IF PATIENT IS CONSCIOUS INDUCE VOMITING OBTAIN MEDICAL ATTENTION SECTION VII SPILL AND LEAK PROCEDURES STEPS TO BE TAKEN IN CASE MATERIAL IS RELEASED OR SPILLED SWEEP OR VACUUM MATERIAL INTO APPROPRIATE WASTE CONTAINER FOR DISPOSAL AVOID DUSTING CONDITIONS WASTE DISPOSAL METHOD THIS MATERIAL MUST BE DISPOSED OF IN ACCORDANCE WITH PROCEDURES ACCEPTABLE UNDER FEDERAL STATE AND LOCAL REGULATIONS PRECAUTIONS TO BE TAKEN IN HANDLING AND STORING KEEP CONTAINER CLOSED STORE IN A COOL DRY PLACE AVOID GENERATING DUST SECTION VIII CONTROL MEASURES RESPIRATORY PROTECTION
16. Humidity Control Drawing T RH sensor x Rotronic Hygroclip CHAMBER i 7 circ fan ACTUAL gt 1 COMMAND gt 75 3 Watlow Model 965 Watlow 96 Control Figure 4 VAPORTRON H 100 B Humidity Control Drawing If the chamber RH compares lower than desired a proportional PWM signal is output by the controller to a solid state 120 VAC or 230 VAC for non US models relay which in turn feeds a small AC type diaphragm pump PW The pump draws chamber air pumps it through the specially designed saturator vessel and outputs it back into the chamber The output is vented directly into a 20 Ipm internal circulator fan such that rapid molecular mixing occurs inside the chamber working volume Buck Research Instruments LLC VAPORTRON H100BL H100CL Series Conversely if the reference sensor senses a humidity that is moister than the present setpoint a PWM error signal is output by the controller to another SSR which in turn powers a separate pump The PD pump flow is essentially in parallel with the wet side but they do not operate at the same time The dry side pump feeds chamber air into a Calcium Sulfate filled cartridge which dries the air to a 0 2 RH or a dewpoint of approximately 40 C Molecular sieves can also be used in the cylinders for better dry end performance Silica gel while slightly less efficient can be used for minimum particulate generation when feeding Raoult sensitive sensors Finally the air is again mixed tho
17. OMMAND VALUE UP DOWN ARROWS press to increase or lower temperature COOLING is on when red LI led blinks on HEATING is on when red L2 led blinks on DISPLAY RANGE limited to 0 to 50 or 60 C ACTUAL CONTROL RANGE 15 TO 50 C L1 10 TO 60 C L2 CHAMBER The main circular door is approximately 5 inches on the inside The door is DOOR AND normally fitted with a single 25 mm actually 26 mm clearance gland sealed PORTS type access fitting optionally two ports can be supplied on the door Port fitting size adaptors are available for most commonly available sensor probes typically 12 13 mm TESTO and VAISALA small diameter 3 8 inch Hy cal probes 15 16 mm Rotronic small probes 18 mm Vaisala large HMP 35 series 20 21 mm TESTO large diameter 11 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series 5 USE AND CALIBRATION General Practices For best dewpoint accuracy the user is urged to use the output from the air immersed PRT temperature sensor that is co located with the RH sensor This allows for actual AIR temperatures to measured from the place where the RH level is slaved Some general practices to observe include e To minimize mixing with ambient air and RH over underload temporarily shut off the Control Switch when opening chamber door e Keep RH setting low 20 30 when changing chamber temperatures ESPECIALLY WHEN COOLING DOWN e Before chamber shutdown set RH to a low value 20 30 to
18. TOO MOIST OR TOO DRY Possible Cause Suggested Action Leaks in or near the chamber door or through rubber port gland or rubber stopper Check and apply clay or tape shut Open return fitting no cover or hose on fitting on SAMPLE RETURN Replace cover or tape the fitting shut Abnormally cold or hot chamber temperatures Bring chamber close to ambient temperature see if control improves CHAMBER TOO MOIST NO CONTROL Possible Cause Suggested Action Condensation on chamber walls Open chamber wipe walls with dry cloth allow to air dry for 5 10 minutes Desiccator cartridge used up all pink or grey in colo or has become physically disconnected from the chamber hoses Note that the system can actually work without the dryer connected but the chamber will be limited to or gt than whatever the prevailing room humidity is Check desiccator cartridge Replace if all pink or grey Reconnect hose if disconnected Hygroscopic load Some materials have TREMENDOUS water capacity in the vapor phase eg Nylons PVC plastics and woods etc Remove any objects you suspect could be too hygroscopic Buck Research Instruments LLC VAPORTRON H100BL H100CL Series CHAMBER TOO DRY NO CONTROL Possible Cause Suggested Action No liquid water in saturator vessel Check back sight glass and tilt cabinet front to back to confirm the water level
19. adually turns from dark blue when dry to pink or greyish white when depleted Normally a sharp contrast is seen when using granular CALCIUM SULFATE material between the depleted and fresh section depletion is from left to right from back view Replenish desiccant when edge of pink color approaches 2 cm 1 inch from the right end of drying tube on rear of instrument use only DARK BLUE ultra dry desiccant approx 1 month operating time is normal service per charge Keep covers on desiccator cartridge if it is stored while NOT connected to the VAPORTRON system hoses For VAPORTRONSs with the dew point option DP we normally supply the desiccator tube filled with molecular sieve and calcium sulfate The molecular sieve dries the air by a mechanical method as opposed to chemical and is less dusty This allows longer use of chilled mirrors before mirror contamination occurs We advise to change the desiccant at 1 inch to left of the red line when using the molecular sieve filled drier cartridges Figure 7 Rear panel with desiccant cartidge correctly installed 16 Buck Research Instruments LLC VAPORTRON H1I00BL H100CL Series WATER RESERVIOR CHECK AND WATER SERVICE PROCEDURE The VAPORTRON internal vapor saturator water reservior is designed for long service between re fills Depending on the amount of use the normal refill of water should last from 4 to 6 weeks to only to 1 week for continuous use or heavy cycling fro
20. and allow another 5 minutes again record the sensor values 4 Finally set the VAPORTRON for an RH of 90 or 9596 and allow the sensors approximately 10 15 min to soak Record the sensor readings after 5 minutes and again at 15 minutes Most normal RH polymers will show a small upward creep However this change in RH should be less than 0 596 RH 5 Return the VAPORTRON RH to the initial low RH and allow 10 minutes for full stabilization SENSOR RESPONSE ANALYSIS Plotting the four recorded measurements from the calibration procedure on a linear linear graph will make it easier to determine if sensor adjustments are necessary The lines behavior and suggested adjustments are as follows If a DUT output shows a constant offset to a perfect 1 1 line curve A on Figure 6 adjust the DUT s zero or low RH potentiometer If a DUT shows an output that crosses the straight line but is either flatter or steeper than 1 1 curve B on Figure 6 adjust both the DUT s zero and span or HIGH potentiometer If a DUT shows a hump sag or severe non linearity through the middle of the range or excessive slope above the 75 to 95 range then an iterative compromise set of adjustments 13 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series will need to be made to get a best fit If it is necessary to have the ideal sensor response at a restricted RH range the non linearity may be ignored Sensor Linearity Gra
21. anty 30 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series Appendix Watlow Controllers Material Safety Data Sheets Sample Certificate of Conformance Humidity Related Tables Product Line Description Buck Research Instruments LLC VAPORTRON H100BL H100CL Series 1 INTRODUCTION Overview The VAPORTRON sertes calibration system is a high performance stand alone temperature humidity reference generator It features a thermal servo system to stabilize temperature in the range of 15 to 60 C at 0 2 C stability Relative humidity is rapidly generated in range of 3 to 95 RH at 0 2 RH stability RH accuracy is 1 5 at maximum between 20 90 RH At temperatures near ambient a typical accuracy of 1 RH is achieved The chamber volume is 2 liters in a 12 cm 5 inch diameter by 34 cm 7 inch cylindrical space A thermoelectric cooler provides a means of stabilizing the chamber working temperature at a differential centered near the ambient air conditions in the room The servo based humidity control provides a system with the precision needed for laboratory and research needs It also provides the overdrive required for production operations where large surface area or multiple sensor calibrations are processed Due to the design of VAPORTRON the typical settling time to a 1 RH stability is only 2 3 minutes Specifications MODEL OPTIONS H 100BL 15 60 C at 0 2 C stability H 100CL as above with Wat
22. ase the RH setting will only cause more condensation and the actual air volume humidity will remain the same In other words the limits of high RH operation will depend on how much cooling is being demanded of the heat exchanger The most reliable way to get RH values above 9096 RH is to set the chamber temperature a little above ambient 1 2 C and start by increasing the RH command by 1 RH intervals Each time after the RH value stabilizes decrease the RH value by 126 RH If the chamber responds quickly then increase the RH command by 1 RH and continue increasing the RH value by 1 RH increments When the chamber no longer quickly responds to a decrease of 1 RH then it is at or near physical saturation It is also wise to make sure the chamber is stable and not oscillating or ramping in temperature when running at high RH levels 15 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series Verify that a problem with condensation is occuring by commanding a 5 to 10 RH step setting temporarily Watch the RH display If it freezes or holds at the previous high RH reading for a long time before responding to the new setpoint there is a condensation problem The slow response is evidence of water puddling as the system waits to evaporate liquid water from the walls DESICCANT DRIER CARTRIDGE SERVICE The plastic desiccator tube holds enough material to run the VAPORTRON typically for one month See Figure 7 The dryer material gr
23. avoid condensation inside chamber during storage e Replace humidifer level with distilled water as required typically once per month is adequate e Use LAB ALGAECIDE or 1 DROP of Clorox chlorine bleach per filling to inhibit mold The water tank is accessed by removal of red rubber cap at the center of the rear panel e Add water slowly with a small syringe Typically add only 20 cc of water WARNING IF THE WATER LEVEL IS OVERFILLED SEE ROUND WINDOW AT BOTTOM REAR PANEL LIQUID WATER MAY BE INADVERTENTLY PUMPED DIRECTLY INTO THE CHAMBER WORKING VOLUME BE CAREFUL Calibration CALIBRATION OF SENSORS AND TRANSMITTERS WITH THE VAPORTRON In the past the most widely used method for RH calibration has been with saturated salts With salts it is possible to attain sub 1 RH accuracies but usually at the expense of a lot of time spent on the slow equilibration times especially above the 75 RH level An additional related problem is that most sensor electronic combinations exhibit interactions between the calibration adjustment points When long times are needed for the salt and the sensor to stabilize it is not usually time efficient to properly address the interaction problem i e through iteration With the VAPORTRON system we have chosen to accept slightly less final generation accuracy circa 1 5 but to greatly accelerate the time to change RH values and associated settling times 12 Buck Research Instruments LLC V
24. cy e The polymer reference sensor is approximately 1 10 the cost of a chilled mirror hygrometer of similar sensing accuracy It is compact rugged and produces no waste heat in the chamber This allows us to offer a complete temperature controlled generator package for a price comparable to our most affordable chilled mirror hygrometer e The VAPORTRON system takes advantage of the high stability and physical durability of the world s best polymers Only ROTRONIC premium sensors meet the stringent standards required for use in the VAPORTRON e This system was designed with generation of relative humidity as a major concern For this reason it excels at development calibration and evaluation of other RH sensors The great speed and precision of the VAPORTRON servo type generator saves both time and cost e VAPORTRON is ideal for industrial or commercial transmitter calibrations where multiple sensors can be calibrated at once with exceptionally low unit to unit variation As standard final certification we verify each VAPORTRON output RH using a CR 4 chilled mirror hygrometer and a Rotronic Hygropalm Both hygrometers support better than 1 RH accuracy in this range This comparison allows NIST traceability for our systems Relationship between Dewpoint and Relative Humidity Figure 1 was calculated from the Clasius Clapeyron general equation with the Goff Gratch equivalent integration and used in a computer program developed at Buck Res
25. e red L1 and L2 LEDs right side or top of each controller will indicate when moist or dry air is pumping into the chamber The temperature control may take from a few minutes up to approximately 15 minutes near the extreme range ends At room temperature normal achievable control control range in the chamber is 15 to 50 C L1 10 to 60 C L2 The VAPORTRON has been filled with an adequate supply of distilled water for approximately 1 month of normal operation However check the rear panel reservior window weekly 10 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series DIGILOG INSTRUMENTS USA VAPORTRON H 100L EC B PRECISION HUMIDITY LA SEC DELAY TO NEW SETPOINT POWER CONTROL B B Figure 5 VAPORTRON H 100BL front panel Table 2 VAPORTRON control functions POWER Powers up all measuring and readout displays All control systems are SWITCH disabled Chamber is floating and is allowed to reach equilibrium with ambient air CONTROL Enables both temperature and RH Controllers Turns on internal chamber fan SWITCH RH Watlow model 965A CONTROL TOP GREEN LED 0 100 RH display of chamber RH LOWER GREEN LED RH command or setpoint value UP DOWN ARROWS press to raise or lower RH command DRY AIR is on when red L2 led blinks on WET AIR is on when red LI led blinks on TEMPER Watlow model 965A ATURE TOP RED LED 0 50 C L1 air temperature CONTROL BOTTOM RED LED 0 50 C air temp C
26. earch Shown is the exponential dependence of dewpoint when RH is used as the reference input or vice versa This curve should be consulted when trying to cross reference humidity measuring instruments of different types As can be seen when generating high RH levels a corresponding high accuracy should be realized in dewpoint due to the shallow slope Conversely a small RH change at the dry end can result in large dewpoint changes H100CL Series Dew Point C 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 RH 94 Figure 1 Relative humidity vs dewpoint at a fixed air temperature of 25 C 3 INSTRUMENT DESCRIPTION Figure 2 shows the 2 0 L working volume of the chamber It consists of a 12 cm diameter by 34 cm long insulated plastic cylinder The chamber is designed as an isothermal mixing vessel with a small turbo axial fan stirring air inside it A high efficiency heat sink is situated near the main cabinet fan outside of chamber for thermal exchange of heat to from the outside Located between the chamber internal heatsink and the cabinet heat sink is a high capacity Peltier cooler Model LI single stage L2 dual stage which is operated conservatively at 5 volts and approximately 2 5 to 5 Amps 15 to 30 watts Figure 2 Photo of inside of the 2 liter workspace RH reference sensor is on top PT 100 sensor is on the bottom Buck Research Instruments LLC VAPORTRON H100BL H100CL Series Thermal Control Sys
27. low 96 PID serial data link RH amp Temp amp software 2 THEORY OF OPERATION Philosophy of Design The VAPORTRON system was developed around a solid state capacitive polymer sensor This philosophy differs somewhat from conventional humidity generators as we rely on a carefully calibrated transfer standard the polymer instead of first principal methods i e gravimetric two pressure divided flow dewpoint referenced feedback etc The VAPORTRON system excels for the following reasons e We generate relative humidity directly via servo action against the reference thus no calculations or conversions are required to read out the chamber humidity The chamber environment is AT the humidity displayed on the readout panel e The reference sensor output is monotonic There is no secondary control system to hamper or distort the sensor response to changes in moisture This provides for a controlled rapid approach to the desired humidity and a stable humidity output thereafter Buck Research Instruments LLC VAPORTRON H100BL H100CL Series e There is no phase change ambiguity or oscillation introduced when the dewpoint measured or generated goes below 0 C e A wide dynamic range of chamber output is possible The 2 98 RH range corresponds to a 24 to 24 C dewpoint range e The polymer is immune to dust and salt contamination and requires little maintenance A six month to one year service period is typical for 1 accura
28. m hi to low RH levels To check the water level remove the desiccant cartridge and look into the large window near the left desiccant hangar hook see Figure 8 Use the small inspection lamp supplied in the service kit If necessary tilt the VAPORTRON chassis fore aft or left right about 20 degrees This may help to visually locate the water level NOTICE BEFORE OPERATION INSTALL DESICCANT TUBE AND CONNECT BOTH HOSES DIGILOG INSTRUMENTS USA LNEIAND COLORADO PICO NT Figure 8 Water guage window location left Detailed figure of guage window decal right The water level must be between to lower and upper red lines on the fill level decal NEVER ADD MORE THAN 30 CC OF WATER When available use distilled water otherwise use clean tap water or bottled water A blunt needle syringe was included in the service kit to aid in filling the reservior Always re install the small cap after adding water 17 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series 6 TROUBLESHOOTING In normal operation the control system will respond quickly to bring the RH reading to very close to the digital command LED setting If the pumps run for a long time and or the RH reading does not quickly settle in it could be caused by the following First shut off main power for 1 second then back on This action assures immediate re entry of correct setpoints in case the system has been left idle with the CONTROL switch off CHAMBER
29. ontrol switch is on L2 Drying Air Information Activity Up Arrow Key Increases the value of the displayed setpoint A light touch increases the value by one Holding the key down increases the value at a rapid rate New data is self entering in five seconds Down Arrow Key Decreases the value of the displayed setpoint A light touch decreases the value by one Holding the key down decreases the value at arapid rate New data is self entering in five seconds Buck Research Instruments LLC VAPORTRON HIO0BL HIOOCL Series Drying Column for Air and Gases eau Aa 8 Us oA es EZ CASES SOLIDSAIQUIDS GASES SOLIDS 5 nib s AS i li ws N v pressures up to 90 psig BD RIERIT 4 Ex RE SAAT BUTI MLR ARN ES IUIUS RBS INDICATING DRIERITE IN THIS ACRYLIC UNIT DRIES AIR TO A DEW POINT OF 100 F AND PROVIDES INDICATION OF DESICCANT CONDITION The Laboratory Air and Gas Drying Unit will completely dry air at atmospheric pressure or pressures up to 90 psig simple connection by rubber hose from the compressed air line or gas cylinder to the bottom inlet of the dryer provides an immediate flow of dry gas Flow rate may be 200 liters per hour or 0 1 scfm Continuous flows are possible with two units in the line and the neces DET ps aim sary valves so that the exhausted column may be refilled while the alter a Unies nate column remains in use COLOR CHANGE Indicating DRIERITE i
30. ph Ideal 1 1 Ideal 1 1 E 9 Ss S a oc 20 40 60 80 Actual RH VAPORTRON Figure 6 Sensor linearity curves Sensor curve A can be corrected by adjustment of offset only Sensor curve B can be corrected by both offset and span adjustment Sensor curve C linearity cannot be corrected however closer average agreement to ideal can be made by lowering offset and raising the gain setting slightly SENSOR TRANSMITTER ADJUSTMENT PROCEDURE Once a preliminary analysis is made through the pre calibration and exploratory runs use the following steps to calibrate the sensor transmitter 1 Adjust each DUT s low or zero to within 1 of the actual VAPORTRON RH Assuming you are still at the 20 3096 RH step 2 Set the VAPORTRON to the high end point where you want to optimize the slope or span of the sensor i e 75 to 80 RH allow 10 minutes soak time then adjust the gain or span potentiometer of the DUT for within 1 of actual RH 3 Return to the dry end wait 5 minutes and make a final usually 0 596 adjustment to the zero adjustment 4 If necessary return to the High RH and make a final trim to the span 14 Buck Research Instruments LLC VAPORTRON H100BL H100CL Series 5 Set the VAPORTRON to mid scale 50 and allow sensors to stabilize It is at this point that true sensor linearity can be
31. roughly with the chamber air upon its entrance Because of the servo nature of this system the chamber responds rapidly to either a change in setpoint or a sudden change in chamber humidity loading The servo pumps provide an ample overdrive capability such that only 2 3 minutes are required for most step changes in command value At the extreme ends lt 10 and gt 90 RH the system can take 10 15 minutes to reach the desired humidity This is due to reduced drive differential and chamber container and any contents surface uptake outgassing at each end of humidity extremes Typical control errors deviation from setpoint are 0 1 RH from 10 to 90 RH setpoint to around 1 error at the ends of the controlled range 3 to 98 RH To allow for near 100 RH at chamber temperatures of 25 C and above the vapor saturator is electrically heated Additionally a very low heat is maintained on the saturator delivery plumbing to ensure that condensation limits are above ambient temperature Buck Research Instruments LLC VAPORTRON H100BL H100CL Series 4 SET UP AND VERIFICATION The VAPORTRON control functions are shown in Figure 5 A description is listed roughly from Left to Right in Table 2 See Appendix pages A 1 and A 2 for detailed description of temperature and RH controllers 1 Unpack the VAPORTRON from the shipping carton and protective carrying case 2 Remove the power cord and desiccant cartridge from side pouch and make s
32. s a distinct blue color When exhausted it turns to a rose red or pink The zone between the two colors in the column may be a purple color and this zone should be a sharp narrow band when the flow rate is ct equilibrium Regeneration will restore the blue color The Indicating DRIERITE gives constant visual assurance of active desic cant The progress of this color change upward through the column is very informative It shows the drying zone as a narrow color band when the correct flow rates ore used The band widens when optimum flow rates are exceeded SUGGESTED USES 1 Drying laboratory systems and apparatus prior to distillation reflux ing etc 2 Pressurization of electronic enclosures where electrically dry atmos pheres are imperative 3 Vent drier on 55 gallon storage tanks or venting any instrument compartment that will breathe in moist oir 4 Supply small flows of instrument air 2 j m gt 5 Drying airborne optical instruments wave guides and electronic en vett Ga Sasam closures subject to pressure and temperature changes SSS es t j 6 Moisture indicator for compressed air and gases cae e 8 5 7 General purpose absorption column that can be refilled with Ascarite ue N for CO removal or charcoal and other physical adsorbents for spe Laboratory Gas and cific separations Ai ing Unit E Drying Ne 8 The unit may be used for gravimetric determination of water vapor STOCK NO 26800 in air and
33. tem The thermal design of the VAPORTRON is depicted in Figure 3 The chamber temperature is maintained by a Watlow series 965 for BL models and Watlow 96 for CL models micro processor based PID controller see Appendix for details on Watlow controllers The controllers measure a platinum resistance sensor element that is placed in the chamber vessel near the rear center Chamber setpoint is made via the controller digital front panel which has a 0 1 C resolution The PID controller maintains the chamber internal air temperature at a 0 1 C stability The PID controller applies PWM pulse width modulation signals to the bases of a power MosFET driver transistor array The FETS operates as current switches to the Peltier module attached to the chamber heat sink The Peltier module s heat pumping is automatically bi directional in polarity That is either heating or cooling is possible depending on environmental conditions This configuration allows the maximum thermal efficiency as well as fastest chamber temperature rate of change when needed The PID controller can be set from 0 to 50 C 60 C for L2 by simply pressing the up or down arrows to change the setpoint The chamber will typically arrive at a new stable temperature within 3 to 5 minutes after changing the command value Up to 20 minutes should be allowed at the coldest and warmest program temperatures The M and A M buttons are disabled and have no function
34. tested and any compromise adjustments can be contemplated Usually the low or zero adjustment is may now be trimmed to allow for a split the difference trade off deviation to be made for the low and high end RH regions SPECIAL LOW END TRIMS Some sensor transmitters especially for industrial ovens or dryers will have an additional adjustment for the very dry end of the RH spectrum usually in the 5 to 1096 RH range Once the general output is adjusted as per the above sequence it is safe to make minor adjustment trims by setting the VAPORTRON to approximately 1096 RH and allowing 15 minutes for dryout then adjusting the special LOW or DRY potentiometer If a total change is 596 or more in this region it is advised to again return to the normal 20 30 range to verify that circuit interaction is not excessive 0 5 to 196 Other Guidelines OPERATING AT HIGH RELATIVE HUMIDITY This calibration chamber is designed for optimum performance near or slightly above the ambient air temperature The unit will generate RH at cooler and warmer temperatures but at some sacrifice in the range of humidity output The RH range that is possible will be narrowed at both the moist and dry ends by 1046 or more When operating the system at very high RH levels 29096 it is important to realize that gradients in temperature i e cold surfaces can cause condensation of liquid water on that surface When this occurs attempting to maintain or incre
35. ure the line voltage is correct Plug power cord into power outlet Unfold desiccant holder hooks at rear panel install fresh cartidge and connect plastic hoses to each end of the cartridge Place silver cap to INSIDE end of machine Switch on POWER lower left Both RH DISPLAY green upper digits and TEMPERATURE display red upper digits should read the approximate room conditions Open white chamber for a few seconds The RH reading should rise a few percent as the internal reference sensor responds to your skin humidity Replace door and install rubber stopper in aluminum port fitting a test sensor may be inserted instead seal around any cracks using the clay as provided in the kit Switch on CONTROL A muffled high pitched sound should indicate proper operation of air circulator fan inside the chamber The command or setpoint is read and adjusted in the lower displays Press the UP and DOWN ARROWS to change the command humidity set the RH command between 20 and 8096 RH and allow 5 seconds for the new command to be updated The setpoint for temperature is similarly adjusted using the UP and DOWN ARROWS Set point is read off the lower display Use a set point of 25 0 C to start out i e use a value close to ambient temperature The VAPORTRON displays should begin to ramp toward the values that were set Normally the RH reading will stabilize within 10 60 seconds when the value desired is within 1046 to 90 RH Th
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