7012
Calibration Bath
User Manual
Rev. 992802
Hart Scientific
Page 1: ...7012 Calibration Bath User Manual Rev 992802 Hart Scientific...
Page 2: ...he warranty period To obtain warranty service contact your nearest Hart authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination...
Page 3: ...mental Conditions 12 4 Quick Start 13 4 1 Unpacking 13 4 2 Set Up 13 4 3 Power 14 4 4 Setting the Temperature 14 5 Installation 17 5 1 Bath Environment 17 5 2 Dry out Period 17 5 3 Bath Preparation an...
Page 4: ...ristics Charts 30 8 1 11 1 Limitations and Disclaimer 30 8 1 11 2 About the Graph 31 8 2 Stirring 33 8 3 Power 33 8 4 Heater 33 8 5 Cooling 34 8 6 Fluid Drain 34 8 7 Temperature Controller 34 9 Contro...
Page 5: ...Mode 52 10 1 2 4 Linefeed 52 10 1 3 Serial Operation 53 10 2 IEEE 488 Communication 53 10 2 1 Setup 53 10 2 1 1 IEEE 488 Interface Address 53 10 2 2 IEEE 488 Operation 53 10 3 Interface Commands 53 10...
Page 6: ...bath fluids and their properties 32 Figure 7 Controller Operation Flowchart 38 Table 3 Proportional Band Fluid Table 43 Figure 8 Bath temperature fluctuation at various proportional band settings 43 F...
Page 7: ...he instrument or in this manual Symbol Description AC Alternating Current AC DC Battery CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Ha...
Page 8: ...1 2 1 WARNINGS To avoid possible electric shock or personal injury follow these guidelines GENERAL DO NOT use the instrument for any application other than calibration work The instrument was designe...
Page 9: ...s supply for the instru ment must be capable of supplying power to the instrument as listed in Section 3 1 Specifications The power cord of the instrument is equipped with a three pronged grounding pl...
Page 10: ...ing of these parameters is important to the safety and proper operation of the unit The refrigeration may be damaged or the lifetime shortened if the set point temperature is set above 60 C for more t...
Page 11: ...oes not trigger the delay If a High Low voltage condition exists for longer than 5 seconds the bath will be de energized The Mains Out of Range light on the back of the bath will be lit indicating a f...
Page 12: ...trict Beijing 100004 PRC CHINA Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terr...
Page 13: ...Voltage Complete description of the problem 7 1 Before You Start Authorized Service Centers...
Page 14: ...microcontroller to execute the many operating functions User interface is provided by the 8 digit LED display and four key switches Digital remote communications is optionally available with a RS 232...
Page 15: ...Watts Safety Cutout Factory set high temperature Temperature Drift per C Ambient or 10 VAC line 0 2m C Pump Recirculation optional 15 L min Access Opening 162 mm X 292 mm 6 38 X 11 5 Depth 457 mm 18...
Page 16: ...usty or dirty environment Maintenance and clean ing recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions ambient tempera...
Page 17: ...r s Guide Report of TEst Fill Hole Cover Drain Elbow If you are missing any item please contact an Authorized Service Center 4 2 Set Up Set up of the bath requires careful unpacking and placement of t...
Page 18: ...e the dotted box indicates the display reading Explanation of the button or display reading are to the right of each button or display value To view or set the bath temperature set point proceed as fo...
Page 19: ...e necessary to reach higher tem peratures and control at high temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature...
Page 20: ...ure to drain the fluid to prevent any injury The side of the bath with the compressor is heavier than the tank side To safely move the bath two people are required 5 1 Bath Environment The Model 7012...
Page 21: ...the bath heater 5 4 Probe Inspect the bath controller probe This probe should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it con tains a precision th...
Page 22: ...o wipe the probe with a clean soft cloth or paper towel before inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid sal...
Page 23: ...achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Othe...
Page 24: ...o set the bath temperature set point access and set other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows SET Used to di...
Page 25: ...3 1 the back pressure valve 2 the cooling temperature regulating valve and 3 the cooling temp gauge With the interface option an extra cooling valve HIGH is provided 1 The back pressure valve adjustm...
Page 26: ...orating The cooling temp regulating valve is used to set and then control this temperature 7 3 Back Panel The back panel has five standard features and two optional features see Figure 4 1 the probe c...
Page 27: ...the bath is supplied with a GPIB IEEE 488 interface the interface ca ble attaches to the back of the bath at the connector labeled IEEE 488 7 4 Bath Tank and Lid There are two different types of lids...
Page 28: ...for inserting a thermometer into the bath 3 The rectangular access hole on the standard lid may be used to insert the users device to be thermostatted To obtain specified control levels this hole must...
Page 29: ...perate 6 A drain valve is provided for ease of removing the fluid media from the bath Always use a container of adequate size to hold the full load of fluid Some oils are more easily drained at higher...
Page 30: ...cool condensed fluid dripping into the bath from the lid The bath temperature should be limited by setting the safety cut out so that the bath temperature cannot exceed the safe operating temperature...
Page 31: ...expansion may also be undesirable in applications where constant liquid level is important Oils typically have significant thermal expansion 8 1 6 Electrical Resistivity Electrical resistivity descri...
Page 32: ...characteristics 8 1 10 1 Water Water is often used because of its very low cost availability and excellent tem perature control characteristics Water has very low viscosity and good thermal conductivi...
Page 33: ...fairly safe These oils are relatively expensive 8 1 11 Fluid Characteristics Charts Table 2 and Figure 6 have been created to provide help in selecting a heat ex change fluid media for your constant...
Page 34: ...temperature scale is shown in degrees Celsius A sense of the fluid s general range of application is indicated Qualities including pour point freeze point important viscosity points flash point boili...
Page 35: ...7 125 C 0 00025 25 C 0 0007 50 C 5 25 C Dow Corning 200 5 Silicone Oil 40 C v 133 C fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 25 C 0 00105 1000 25 C 10 150 C Dow Corning 200 10 5012 35 C v 165 C fl cc...
Page 36: ...uid must be mixed well for good temperature uniformity and fast controller response The stirrer is precisely adjusted for optimum performance 8 3 Power Power to the bath is provided by an AC mains sup...
Page 37: ...rought into line It is necessary to wait a few minutes after each adjustment until the system settles Set the COOLING TEMPERATURE according to the cooling label The cool ing temperature should NOT be...
Page 38: ...et the cut out adjust the proportional band monitor the heater output power and program the controller configuration and calibration parameters The controller may be operated in temperature units of d...
Page 39: ...e in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button 9 2 Reset Cutout If the over temperature cutout has been triggered then the te...
Page 40: ...7012 Calibration Bath User s Guide 38 Figure 7 Controller Operation Flowchart...
Page 41: ...elow the upper limit of the fluid Setting the bath temperature involves three steps 1 select the set point mem ory 2 adjust the set point value and 3 adjust the vernier if desired 9 3 1 Programmable S...
Page 42: ...to adjust the set point slightly to achieve a precise bath temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resoluti...
Page 43: ...SET From the temperature display function access the units selection by pressing SET 4 times 25 00 C Bath temperature S Access set point memory 1 25 0 Set point memory S Access set point value C 25 00...
Page 44: ...usly and release The heater power will be displayed as a percentage of full power S E Access heater power in secondary menu 12 Pct Heater power in percent To exit out of the secondary menu press EXIT...
Page 45: ...the most significant factors affecting the op timum proportional band width are heater power setting and fluid viscosity The proportional band should be wider when the higher power setting is used so...
Page 46: ...proportional band S E Access heater power in secondary menu 12 Pct Heater power in percent S Access proportional band Pb 0 101C Proportional band setting To change the proportional band press UP or DO...
Page 47: ...tout set point may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET twice to access the cutout set point S E Access heater...
Page 48: ...e 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 Pressing EXIT will cause the parameter to be skipped...
Page 49: ...to baths fitted with the serial interface The parameters in the menu are BAUD rate sample pe riod duplex mode and linefeed 9 12 1 Baud Rate The baud rate is the first parameter in the menu The baud ra...
Page 50: ...e SA 60 New sample period 9 12 3 Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full du plex or half duplex With full duplex any commands received by the bath via the...
Page 51: ...AddrESS IEEE 488 interface address Press SET to access the address setting Add 22 Current IEEE 488 interface address Adjust the value with UP or DOWN and then use SET to set the address to the displa...
Page 52: ...14 1 CTO Parameter CTO sets the calibration of the over temperature cutout This is not adjustable by software but is adjusted with an internal potentiometer For the 7012 baths this parameter should r...
Page 53: ...he cooling power switch must be set to OFF to enable re mote control 10 1 Serial Communications The bath may be installed with an RS 232 serial interface that allows serial digital communications over...
Page 54: ...he sample period is the next parameter in the menu and prompted with SAm PLE The sample period is the time period in seconds between temperature measurements transmitted from the serial interface If t...
Page 55: ...SET repeat edly until the display reaches PrObE This is the menu selection Press UP repeatedly until the IEEE 488 interface menu is indicated with IEEE Press SET to enter the IEEE 488 parameter menu...
Page 56: ...and to n pr op band n pr 8 83 Depends on Configuration Read cutout setting c utout c c 9999 x xxx c 620 C in Set cutout setting c utout n r eset Set cutout to n degrees c utout n c 500 Temperature Ran...
Page 57: ...mber ver sion ver ver 9999 9 99 ver 2100 3 56 Read structure of all commands h elp h list of commands Read Heater f1 f1 f1 9 f1 1 Set Heater f1 1 0 0 or 1 Set heater to low f1 n f1 0 Set heater to hig...
Page 58: ...tions with the digital interface These are heater power high low cooling on off ex pansion valve on off and back pressure valve on off 10 4 1 Heater Control To control the heater with the digital inte...
Page 59: ...e left off closed throughout the operating range of the bath Table 5 summarizes the control functions for heating and cooling Table 6 shows the recommended control settings for each operating temperat...
Page 60: ...ul operating range of the bath The farther apart the calibration temperatures the larger will be the calibrated temperature range but the calibration error will also be greater over the range If for i...
Page 61: ...re spectively and the data for tL tH errL and errH were as given above then the new values D0 and DG would be computed as 25 831 and 188 220 respec tively Program the new values D0 and DG into the con...
Page 62: ...red t 24 869 C tH 75 00 C measured t 74 901 C Compute errors errL 24 869 25 00 C 0 131 C errH 74 901 75 00 C 0 099 C Compute D0 D0 0131 75 0 25 229 0 099 25 0 25 22 9 75 0 25 0 25 229 25392 Compute DG...
Page 63: ...ges in fluid level are dependent upon several factors specific to the environment in which the equipment is used A schedule cannot be out lined to meet each environmental setting Therefore the first y...
Page 64: ...es of the fluid medium in order to maintain a uniform and stable temperature envi ronment Some oils change their characteristics or become dirty after a period of use Always remove any foreign materia...
Page 65: ...drain well The viscosity affects how rapidly it drains as well as how well it flows off of the walls Heat proof containers and appropriate safety equipment such as face shields gloves and body coverin...
Page 66: ...heater fuses may also cause this problem If the heaters seem to be burned out contact an Authorized Service Center see Section 1 3 on page 5 for assistance The controller display flashes Cut out and t...
Page 67: ...medy the problem there may be a failed electronic component Contact an Authorized Service Center see Section 1 3 on page 5 for assistance The displayed process tempera ture is in error and the control...
Page 68: ...controller shows that the out put power is steady but the pro cess temperature is unstable Possible causes are an improper proportional band setting or the fluid being used If the bath temperature do...
Page 69: ...ler parameters 1 Power off the instrument 2 Disconnect the instrument from AC power for 10 seconds 3 Reconnect the AC power and power on the instrument 4 If the display shows InIT and or the cycle cou...
