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August 2012

© 2012 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
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7341

Calibration Bath

Users Guide

Via Acquanera, 29

22100 Como

tel. 031.526.566 (r.a.) fax 031.507.984

[email protected]

www.calpower.it

Содержание 7341

Страница 1: ...erved Specifications are subject to change without notice All product names are trademarks of their respective companies 7341 Calibration Bath Users Guide Via Acquanera 29 22100 Como tel 031 526 566 r a fax 031 507 984 info calpower it www calpower it ...

Страница 2: ...rvice center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contami...

Страница 3: ...4 4 Quick Start 4 1 Unpacking 4 3 Set Up 4 3 Power 4 5 Setting the Temperature 4 5 5 Installation 5 1 Moving or Uncrating the Bath 5 3 Bath Environment 5 3 Tipping Prevention Bracket Installation 5 3 Installation On A Wood Floor 5 3 Installation On a Concrete Floor 5 4 Installation Of The Bath 5 4 Dry out Period 5 4 Bath Preparation and Filling 5 5 Power 5 5 6 Bath Use 6 1 General 6 3 Comparison C...

Страница 4: ...ts 8 6 Limitations and Disclaimer 8 6 About the Chart 8 8 Stirring 8 10 Power 8 10 Heater 8 10 Temperature Controller 8 10 Refrigeration 8 11 9 Controller Operation 9 1 Bath Temperature 9 3 Reset Cutout 9 3 Temperature Set point 9 5 Programmable Set points 9 5 Set point Value 9 5 Set point Vernier 9 6 Scan 9 6 Scan Control 9 6 lScan Rate 9 6 Temperature Scale Units 9 7 Ramp and Soak Program 9 7 Nu...

Страница 5: ...ial Communications 10 3 Wiring 10 3 Setup 10 3 Baud Rate 10 4 Sample Period 10 4 Duplex Mode 10 4 Linefeed 10 4 Serial Operation 10 4 IEEE 488 Communication optional 10 4 Setup 10 5 IEEE 488 Address 10 5 Transmission Termination 10 5 IEEE 488 Operation 10 5 Interface Commands 10 5 Cooling Control 10 5 11 Calibration Procedure 11 1 Calibration Points 11 3 Measuring the Set point Error 11 3 Computin...

Страница 6: ...7341 Users Guide iv ...

Страница 7: ...ternational Electrical Symbols 1 3 3 1 Specifications 3 3 8 1 Various Bath Fluids and Their Properties 8 7 9 1 Program Mode Setting Actions 9 9 9 2 Typical Proportional Band Settings for Various Fluids 9 11 10 1 Interface Command Summary 10 6 ...

Страница 8: ...7341 Users Guide vi ...

Страница 9: ...cket Installation 5 4 7 1 Front Control Panel 7 3 8 1 Chart of Various Bath Fluids and Their Properties 8 9 9 1 Controller Operation Flowchart 9 4 9 2 Bath Temperature Fluctuation At Various Proportional Band Settings 9 10 10 1 Serial Communications Cable Wiring 10 3 11 1 Calibration Example 11 4 ...

Страница 10: ...7341 Users Guide viii ...

Страница 11: ...1 1 Chapter 1 Before You Start Title Page Symbols Used 1 3 Safety Information 1 4 Authorized Service Centers 1 7 ...

Страница 12: ...7341 Users Guide 1 2 ...

Страница 13: ...Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information O Off I On Canadian Standards Association CAT II OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 refers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Examples include h...

Страница 14: ...aration and Filling in Chapter 5 for specific instructions Follow all safety guidelines listed in the user s manual Calibration Equipment should only be used by Trained Personnel If this equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired Before initial use or after transport or after storage in humid or semi humid environments o...

Страница 15: ...ntered by overfilling the tank It is intended for expanding fluid rates from heating only Fill tank only until the level reaches the top of the baffle see Figure 4 1 ELECTRICAL HAZARD These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instrument must be plugged into a 115 VAC 60Hz 230 VAC 50Hz optional AC only electric outlet The po...

Страница 16: ...NOT overfill the bath Overflowing fluid may damage the electrical system See Bath Preparation and Filling Chapter 5 for specific instructions Read Chapter 6 Bath Use before placing the bath into service DO NOT turn the bath on without fluid in the tank and the heating coils fully immersed See Fluid Expansion Reservoir Chapter 7 for more information on Fluid Expansion Reservoir use No matter what f...

Страница 17: ...g the heat source through extreme temperature ranges the full temperature limit of the heat source Cycling the instrument can cause excessive stress on the compressors Compressor manufacturers recommend for longest lifetime that the instrument be set at one temperature and left on at that temperature o Turning the instrument on and off frequently adds wear and tear to the compressor Authorized Ser...

Страница 18: ...37 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available Model Number Serial Number Voltage Complete description of the...

Страница 19: ...nterface is provided by the 8 digit LED display and four key switches Digital remote communications is standard with an RS 232 and optional with an IEEE 488 interface The 7341 bath was designed to be compact and low cost without compromising performance The 7341 bath operates over a wide temperature range from 40 C to 150 C The refrigeration permits sub ambient temperature control The 7341 feature...

Страница 20: ...7341 Users Guide 2 2 ...

Страница 21: ...3 1 Chapter 3 Specifications and Environmental Conditions Title Page Specifications 3 3 Environmental Conditions 3 4 ...

Страница 22: ...7341 Users Guide 3 2 ...

Страница 23: ...g Repeatability 0 01 C Heater 700 Watts 115V 230V Nominal Access Opening 6 8 x 4 7 172 x 119 mm Immersion Depth 18 457 mm without liquid in glass thermometer cal kit 19 482 mm with liquid in glass thermometer cal kit Wetted Parts 304 Stainless Steel Power 115 VAC 10 60 Hz 16 A 1660 VA 230 VAC 10 50 Hz 8 A 1450 VA optional Note If the voltage is outside 10 the compressor may be damaged Check the ba...

Страница 24: ...tenance and cleaning recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions ambient temperature range 5 40 C 41 104 F ambient relative humidity maximum 80 for temperatures 31 C decreasing linearly to 50 at 40 C pressure 75kPa 106kPa mains voltage within 10 of nominal vibrations in the calibration environment should be mi...

Страница 25: ...4 1 Chapter 4 Quick Start Title Page Unpacking 4 3 Set Up 4 3 Power 4 5 Setting the Temperature 4 5 ...

Страница 26: ...7341 Users Guide 4 2 ...

Страница 27: ...Authorized Service Center near you see Authorized Service Centers in Chapter 1 Set Up Warning The instrument is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check the flash point boiling point or other fluid characteristic applicable to the circumstances of the instrument operation Ensure that the soft cutout is adjusted to the fluid characteristics of th...

Страница 28: ... through the large rectangular access hole above the tank avoiding spilling any fluid Caution When filling the tank ensure the immersion coils are completely covered DO NOT FILL ABOVE THE STIR BAFFLE See Figure 4 1 MIN FILL Maximum Fill Level Top of Baffle Minimum Fill Level Line haz001 eps Figure 4 1 Stir Baffle Fill Levels ...

Страница 29: ...peratures Note The actual temperature where cooling is required depends on the bath fluid and whether a cover is used over the access well Setting the Temperature In the following discussion and throughout this manual a solid box around the word SET UP DOWN or EXIT indicates the panel button to press while the dotted box indicates the display reading on the front panel Explanation of the button fu...

Страница 30: ... or cools until it reaches the new set point temperature Turn off the cooling to reach and control at higher temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cutout should be correctly set for added safety See Cutout in Chapter 10 To obtain optimum control stability adjust the proportional band as discussed in...

Страница 31: ...5 1 Chapter 5 Installation Title Page Moving or Uncrating the Bath 5 3 Bath Environment 5 3 Tipping Prevention Bracket Installation 5 3 Installation On A Wood Floor 5 3 ...

Страница 32: ...7341 Users Guide 5 2 ...

Страница 33: ...The location should be free of drafts extreme temperatures and temperature changes dirt etc The surface where the bath is placed must be level Provide at least 6 inches 15 cm of clearance around the instrument to allow sufficient air circulation The top surface of the bath may become hot at high temperatures Beware of the danger of accidental fluid spills A fume hood or other adequate ventilation ...

Страница 34: ... tipping bracket Lock the front casters of the bath Check that the bath is securely locked into the tipping bracket by gently pushing on the bath Proceed to fill the bath with the applicable bath fluid after reading the entire Users Guide If you have any questions concerning installation of the tipping prevention bracket please contact a Fluke Authorized Service Center Dry out Period If this equip...

Страница 35: ... Fill the bath carefully through the large rectangular access hole to a level that will allow for stirring and thermal expansion Thermal Expansion in Chapter 8 explains fluid expansion Caution DO NOT turn on the bath without fluid in the tank and the heating coils fully immersed See Fluid Expansion Reservoir in Chapter 7 on how to use the fluid expansion reservoir Be sure the fluid expansion reser...

Страница 36: ...7341 Users Guide 5 6 ...

Страница 37: ...6 1 Chapter 6 Bath Use Title Page General 6 3 Comparison Calibration 6 3 Calibration of Multiple Probes 6 4 ...

Страница 38: ...7341 Users Guide 6 2 ...

Страница 39: ...r or other liquid mediums Be aware that cleaning the probe can be dangerous if the probe has not cooled to room temperature Additionally high temperature fluids may ignite the paper towels if the probe has not been sufficiently cooled For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature Comparison Calibration Comparison calibration ...

Страница 40: ... bath for calibration start by Placing the reference probe in the bath working area Placing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe but not touching the bath tank surface areas Calibration of Multiple Probes Fully loading the bath with probes increases the time required for the temperature to stabilize after inserting the pro...

Страница 41: ...7 1 Chapter 7 Parts and Controls Title Page Front Control Panel 7 3 Back Panel 7 3 Fluid Expansion Reservoir 7 3 ...

Страница 42: ...7341 Users Guide 7 2 ...

Страница 43: ...alue DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored 3 The on off switch controls power to the entire bath including the stirring motor 4 The control indicator is a two color light emitting diode LED This indicator lets the user visually see t...

Страница 44: ...ng when the tank is hot There is a stainless steel dust cover over the reservoir with an elbow on top that the drain tube is inserted into The reservoir hangs on a hook and is attached to the bath with a thumbscrew Warning The drain tube and dust cover may be hot Always be sure the drain tube is fully inserted into the elbow of the dust cover To drain fluid from the reservoir first remove the dust...

Страница 45: ...3 Thermal Expansion 8 3 Electrical Resistivity 8 4 Fluid Lifetime 8 4 Safety 8 4 Cost 8 5 Commonly Used Fluids 8 5 Water 8 5 Ethylene Glycol 8 5 Mineral Oil 8 5 Silicone Oil 8 6 Fluid Characteristics Charts 8 6 Limitations and Disclaimer 8 6 About the Chart 8 8 Stirring 8 10 Power 8 10 Heater 8 10 Temperature Controller 8 10 Refrigeration 8 11 ...

Страница 46: ...7341 Users Guide 8 2 ...

Страница 47: ...ability of the bath With lower viscosity fluid mixing is better This creates a more uniform temperature throughout the bath This improves the bath response time allowing it to maintain a more constant temperature For good control the viscosity should be less than 10 centistokes 50 centistokes is the practical upper limit of allowable viscosity Viscosity greater than this causes very poor control s...

Страница 48: ...Example The final depth of Dow Corning 710 silicone oil in the bath tank is to be 9 2 inches when heated from 25 to 300 C What should the starting depth be Expansion coefficient for 710 oil on Table 2 K 0 00077 inch inch C Ending temperature TE 300 C Starting temperature TS 25 C Ending depth DE 9 2 inches DS 9 2 0 00077 300 25 1 7 59 inches Electrical Resistivity Electrical resistivity describes h...

Страница 49: ...elow is a description of some of the more commonly used fluids and their characteristics Water Water is often used because of its very low cost its availability and its excellent temperature control characteristics Water has very low viscosity and good thermal conductivity and heat capacity which make it among the best fluids for good control stability at lower temperatures Temperature stability i...

Страница 50: ...cal components Table 8 1 and Figure 8 1 have been created to provide help in selecting a heat exchange fluid media for your constant temperature bath These charts provide both a visual and numerical representation of most of the physical qualities important in making a selection The list is not all inclusive There may be other useful fluids not shown in this listing The charts include information ...

Страница 51: ... fl cc 211 C 10 25 C 3 135 C 0 934 25 C 0 43 40 C 0 45 100 C 0 482 200 C 0 00032 25 C 0 00108 1000 25 C 50 150 C Silicone Oil Type 200 20 5013 10 C v 230 C fl cc 232 C 20 25 C 0 949 25 C 0 370 40 C 0 393 100 C 0 420 200 C 0 00034 25 C 0 00107 1000 25 C 50 150 C Silicone Oil Type 200 50 5014 30 C v 278 C fl cc 280 C 50 25 C 0 96 25 C 0 4 0 00037 25 C 0 00104 1000 25 C 50 150 C Silicone Oil Type 550...

Страница 52: ...shown in degrees Celsius The shaded bands indicate the fluids general range of application Qualities including pour point freeze point important viscosity points flash point boiling point and others may be shown Freezing Point The freezing point of a fluid is an obvious limitation to stirring As the freezing point is approached high viscosity may also limit performance ...

Страница 53: ... health hazards posed by fume vapors In the graph it is assumed that the bath access hole is covered at this point This is subject to user s company policy Fluke recommends the use of a ventilation system as soon as the fluid produces vapors Keep the access hole covered to reduce evaporation Flash Point The point at which ignition may occur The point shown may be either the open or closed cup flas...

Страница 54: ...d by periodically switching the heater on for a certain amount of time using a solid state relay The front panel red green control indicator shows the state of the heater The control indicator glows red when the heater is on and green when the heater is off The indicator pulses at a constant rate when the bath is maintaining a stable temperature Temperature Controller Fluke s unique hybrid digital...

Страница 55: ...ature range Since more cooling capacity is generally required below 0 C the hot gas bypass is turned off HGb off providing more cooling capacity When the bath is cooled from temperatures below the cutoff point to 0 C and if the new set point is at least 2 C below the current bath temperature the cooling turns to maximum capacity HGb off until the bath is within about 0 5 C of the new set point Thi...

Страница 56: ... refrigeration may be beneficially used for short times less than one hour above 60 C but less than 100 C This list is not intended to be complete but only suggests some of the situations when automatic modes may not be best Most of the time the automatic functions are adequate and should be used ...

Страница 57: ...oints 9 8 Program Soak Time 9 8 Program Function Mode 9 8 Program Control 9 9 Secondary Menu 9 9 Heater Power 9 9 Proportional Band 9 10 Cutout 9 12 Controller Configuration 9 13 Probe Parameters 9 13 R0 9 13 ALPHA 9 13 Operating Parameters 9 13 Cutout Reset Mode 9 13 Cooling Mode 9 14 Hot Gas Bypass Mode 9 14 Serial Interface Parameters 9 15 Baud Rate 9 15 Sample Period 9 15 Duplex Mode 9 16 Line...

Страница 58: ...7341 Users Guide 9 2 CTO 9 17 CO and CG 9 17 H and L 9 17 HGbt 9 17 ...

Страница 59: ... are displayed at the right For example 25 00C Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button Reset Cutout Cut out Indicates cutout condition The message continues to flash between the actual temperature and Cut out until the temperature is reduced and the cutout is reset The cutout has two modes automatic re...

Страница 60: ...7341 Users Guide 9 4 haz005 eps Figure 9 1 Controller Operation Flowchart rEsEt Cutout reset function Press SET once more to reset the cutout S Reset cutout ...

Страница 61: ... The set points can be quickly recalled to conveniently set the bath to a previously programmed temperature set point To set the bath temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set point memory currently being used is shown at the left on the display followed by the current set point value...

Страница 62: ...d not be pressed This allows the bath temperature to be continually adjusted as it is displayed U Increment display 0 00090 New vernier setting Next press EXIT to return to the temperature display or SET to access the temperature scale units selection S Access scale units Scan The scan rate can be set and enabled so that when the set point is changed the instrument heats or cools at a specified ra...

Страница 63: ...T 4 times Un C Scale units currently selected Press UP or DOWN to change the units U Change units Un F New units selected Press SET to accept the new selection and resume displaying the bath temperature S Set the new units and resume temperature display Ramp and Soak Program The ramp and soak program feature allows the user to program a number of set points and have the instrument automatically cy...

Страница 64: ... are programmed as desired press EXIT to continue E Continue to next menu function Program Soak Time The next parameter in the program menu is the soak time This is the time in minutes that each program set point is maintained after settling before proceeding to the next set point The duration is counted from the time the temperature reaches the set point Pt 15 Soak time in minutes Use the UP or D...

Страница 65: ...ed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simultaneously and then releasing The first function in the secondary menu is the heater power display Heater Power The temperature controller controls the temperature of the bath by pulsing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on ...

Страница 66: ...rying external conditions This is because the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system If the proportional band is too narrow the bath temperature may swing back and forth because the controller overreacts to temperature variations For best control stability the proportional band must be set for the ...

Страница 67: ...Fluids Fluid Temperature Proportional Band Stability Water 30 C 0 31 C 0 003 C Water 60 C 0 31 C 0 003 C Eth Gly 50 35 C 0 31 C 0 005 C Eth Gly 50 60 C 0 31 C 0 005 C Eth Gly 50 100 C 0 4 C 0 010 C Oil 200 10cs 35 C 0 6 C 0 004 C Oil 200 10cs 60 C 0 6 C 0 004 C Oil 200 10cs 100 C 0 6 C 0 004 C Oil 710 200 C 0 4 C 0 008 C The proportional band adjustment may be accessed within the secondary menu Pr...

Страница 68: ...h cools until it reaches a few degrees below the cutout set point temperature At this point the action of the cutout is determined by the setting of the cutout mode parameter The cutout has two selectable modes automatic reset or manual reset If the mode is set to automatic the cutout automatically resets itself when the bath temperature falls below the reset temperature allowing the bath to heat ...

Страница 69: ...probe parameters are accessed by pressing SET after the name of the parameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After the desired value is reached press SET to set the parameter to the new value Press EXIT to skip the parameter ignoring any changes that have been made R0 This probe parameter refers to the resistance of the control probe at 0 C Nor...

Страница 70: ...o access the parameter setting Auto Cooling mode set for automatic To change to On or Off mode press DOWN until the desired mode appears and then press SET On Cooling mode set to on OFF Cooling mode set to off Individual steps may be skipped by pressing EXIT Hot Gas Bypass Mode The hot gas bypass HGb system is a method of reducing cooling or refrigeration capacity It is normally used above approxi...

Страница 71: ...rrent baud rate The baud rate of the bath serial communications may be programmed to 300 600 1200 or 2400 baud Use UP or DOWN to change the baud rate value 2400b New baud rate Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the serial interface parameter menu The sampl...

Страница 72: ...indicated by LF Serial linefeed parameter Press SET to access the linefeed parameter LF On Current linefeed setting The mode may be changed using UP or DOWN and pressing SET LF OFF New linefeed setting IEEE 488 Parameters Baths may optionally be fitted with an IEEE 488 GPIB interface In this case the user may set the interface address and the transmission termination character within the IEEE 488 ...

Страница 73: ...ails the user may restore these values to the factory settings A list of these constants and their settings are supplied to the user on the Report of Test with the manual CAUTION DO NOT change the values of the instrument calibration constants from the factory set values The correct setting of these parameters is important to the safety and proper operation of the instrument The calibration parame...

Страница 74: ...e 9 18 This parameter is the temperature where the hot gas bypass activates This parameter is factory set To insure the bath s best performance without damaging its compressor DO NOT alter the value of this parameter ...

Страница 75: ...10 3 Wiring 10 3 Setup 10 4 Baud Rate 10 4 Sample Period 10 4 Duplex Mode 10 4 Linefeed 10 4 Serial Operation 10 4 IEEE 488 Communication optional 10 4 Setup 10 5 IEEE 488 Address 10 5 Transmission Termination 10 5 IEEE 488 Operation 10 5 Interface Commands 10 5 Cooling Control 10 5 ...

Страница 76: ...7341 Users Guide 10 2 ...

Страница 77: ...o control the cooling with the interface the cooling power switch must be ON Serial Communications The RS 232 serial interface allows serial digital communications over fairly long distances 15 24 meters With the serial interface the user may access any of the functions parameters and settings discussed in Chapter 9 Controller Operation with the exception of the baud rate setting The serial interf...

Страница 78: ... sample period of 0 Press SET to choose to set the sample period Adjust the period with UP or DOWN Press SET to set the sample period to the new value or EXIT to abort and skip to the next parameter Duplex Mode The next parameter is the duplex mode indicated with dUPL The duplex mode may be set to half duplex HALF or full duplex FULL With full duplex any commands received by the bath via the seria...

Страница 79: ...commands are used with both the RS 232 serial interface and the IEEE 488 GPIB interface In either case the commands are terminated with a carriage return character The interface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters which determines a unique command A command may be used to either set a parame...

Страница 80: ...le either through the front panel or through the digital communications interface Table 10 1 Interface Command Summary Command Description Command Format Command Example Returned Returned Example Acceptable Values Display Temperature Read current set point s etpoint s set 9999 99 C or F set 150 00 C Set current set point to n s etpoint n t emperature n s 150 t 150 Instrument Range 40 to 150 C Read...

Страница 81: ... ti 999 ti 5 Set program set point soak time to n minutes pt n pt 5 0 to 500 Read program control mode pc pc prog OFF or ON prog OFF Set program control mode pc g o s top c ont GO or STOP or CONT Start program pc g o pc g Stop program pc s top pc s Continue program pc c ont pc c Read program function pf pf pf 9 pf 3 Set program function to n pf n pf 2 1 to 4 Secondary Menu Read proportional band s...

Страница 82: ...e cm ode r eset a uto Set cutout to be reset manually cm ode r eset cm r Set cutout to be reset automatically cm ode a uto cm a Serial Interface Menu Read serial sample setting sa mple sa sa 9999 sa 1 Set serial sampling setting to n seconds sa mple n sa 0 0 to 4000 Set serial duplex mode du plex f ull h alf FULL or HALF Set serial duplex mode to full du plex f ull du f Set serial duplex mode to h...

Страница 83: ...d low set point limit value tl ow tl tl 999 tl 40 Set low set point limit to n tl ow n tl 40 60 to 20 Read high set point limit value th igh th th 999 th 150 Set high set point limit to n th igh n th 150 150 to 30 Miscellaneous not on menus Read all extended parameters all all list of extended parameters Read firmware version number ver sion ver ver 9999 9 99 ver 7341 1 00 Read all operating param...

Страница 84: ...7341 Users Guide 10 10 ...

Страница 85: ...11 1 Chapter 11 Calibration Procedure Title Page Calibration Points 11 3 Measuring the Set point Error 11 3 Computing R0 and ALPHA 11 3 Calibration Example 11 4 ...

Страница 86: ...7341 Users Guide 11 2 ...

Страница 87: ...n procedure is to measure the temperature errors including sign at the two calibration temperatures First set the bath to the lower set point tL Wait for the bath to reach the set point and allow 15 minutes to stabilize at that temperature Check the bath stability with the thermometer When both the bath and the thermometer have stabilized measure the actual bath temperature and compute the tempera...

Страница 88: ... calibration points are chosen to be 30 00 and 80 00 C The measured bath temperatures are 29 843 and 79 914 C respectively Refer to Figure 11 1 for applying equations to the example data and computing the new probe constants R0 100 000 ALPHA 0 0038500 tL 30 00 C measured t 29 843 C tH 80 00 C measured t 79 914 C Compute errors errL 29 843 30 00 C 0 157 C errH 79 914 80 00 C 0 086 C Compute R0 R0 0...

Страница 89: ...screws on the top surface and the two screws at the rear of the bath Lift the cover just far enough to wipe out the collected oil Heat transfer medium lifetime is dependent upon the type of medium and the conditions of use The fluid should be checked at least every month for the first year and regularly thereafter This fluid check provides a baseline for knowledge of bath operation with clean usab...

Страница 90: ...manual and the auto reset option of the cutout should be checked Set the bath temperature higher than the cutout Check to see if the display flashes cutout and if the temperature is decreasing Note When checking the over temperature cutout be sure that the temperature limits of the bath fluid are not exceeded Exceeding the temperature limits of the bath fluid could cause harm to the operator lab a...

Страница 91: ...13 1 Chapter 13 Troubleshooting Title Page Troubleshooting 13 3 Comments 13 6 EMC Directive 13 6 Immunity Testing 13 6 Emission Testing 13 6 Low Voltage Directive Safety 13 6 ...

Страница 92: ...7341 Users Guide 13 2 ...

Страница 93: ...does not operate The display flashes Cut out alternately with the process temperature If the process temperature displayed seems grossly in error consult the following problem The display flashes Cut out and an incorrect process temperature Normally the cutout disconnects power to the heater when the bath temperature exceeds the cutout set point causing the temperature to drop back down to a safe ...

Страница 94: ...perature If the probe appears to be defective contact an Authorized Service Center see Authorized Service Centers in Chapter 1 for assistance If the problem is not the probe erroneous data in memory may be the cause Re initialize the memory as discussed in the problem The display flashes cutout and an incorrect process temperature If the problem remains the cause may be a defective electronic comp...

Страница 95: ...ional band to a narrower width as discussed in Proportional Band in Chapter 9 Check to ensure the fluid has not deteriorated or is not too thick The controller alternately heats for a while then cools The bath is not stable and the duty cycle is not constant The proportional band being too narrow typically causes this oscillation Increase the width of the proportional band until the temperature st...

Страница 96: ...h shielded RS 232 cables Immunity Testing The instrument was tested for laboratory locations Criterion B was used for Radiated RF IEC 61000 4 3 and Voltage dips short interruptions as well as voltage immunity tests IEC 61000 4 11 Criterion C was used for Electrostatic Discharge ESD IEC 61000 4 2 If the instrument is subjected to ESD conditions the instrument may require the user to cycle the power...

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