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Summary of Contents for Fluke 7080
- Page 1 Hart Scientific 7080/7081 Calibration Bath User’s Guide Rev. 5B2303...
- Page 2 Fluke Corporation, Hart Scientific Division 799 E. Utah Valley Drive • American Fork, UT 84003-9775 • USA Phone: +1.801.763.1600 • Telefax: +1.801.763.1010 E-mail: support@hartscientific.com www.hartscientific.com Subject to change without notice. • Copyright © 2005 • Printed in USA Rev. 5B2303...
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Page 3: Table Of Contents
Table of Contents 1 Before You Start ......1 Symbols Used ......1 Safety Information . - Page 4 Back Panel......23 Lid ........25 8 General Operation .
- Page 5 9.10.1 R0 ........46 9.10.2 ALPHA .
- Page 6 Figures Figure 1 Bath Assembly ......7 Figure 2 Semi-hermetic Compressor ..... . . 12 Figure 3 Front Panel .
- Page 7 13.2 Comments ......68 13.2.1 EMC Directive ....... . . 68 13.2.1.1 Emission Testing .
- Page 8 Tables Table 1 International Electrical Symbols ..... 1 Table 2 Temperature Chart ......23 Table 3 Table of Bath Fluids .
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Page 9: Before You Start
1 Before You Start Symbols Used Before You Start Symbols Used Table 1 lists the International Electrical Symbols. Some or all of these symbols may be used on the instrument or in this manual. Table 1 International Electrical Symbols Symbol Description AC (Alternating Current) AC-DC... -
Page 10: Safety Information
7080/7081 Calibration Bath User’s Guide Symbol Description Canadian Standards Association OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 re- fers 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. - Page 11 1 Before You Start Safety Information period of 2 hours before it can be assumed to meet all of the safety re- quirements of the IEC 1010-1. If the product is wet or has been in a wet environment, take necessary measures to remove moisture prior to apply- ing power such as storage in a low humidity temperature chamber operat- ing at 50°C for 4 hours or more.
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Page 12: Cautions
7080/7081 Calibration Bath User’s Guide BATH FLUIDS • Fluids used in this bath may produce noxious or toxic fumes under certain circumstances. Consult the fluid manufacturer’s MSDS (Material Safety Data Sheet). Proper ventilation and safety precautions must be observed. • The instrument is equipped with a soft cutout (user settable firmware) and a hard cutout (set at the factory). -
Page 13: Authorized Service Centers
Voltage Cut In: ±7.5% (213 - 247 VAC) Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product: Fluke Corporation, Hart Scientific Division 799 E. Utah Valley Drive American Fork, UT 84003-9775 Phone: +1.801.763.1600 Telefax: +1.801.763.1010... - Page 14 22 Jianguomenwai Dajie Chao Yang District 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 Terrace #03-16 The Comtech (Lobby D) 118502 SINGAPORE Phone: +65 6799-5588 Telefax: +65 6799-5588 E-mail: antng@singa.fluke.com...
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Page 15: Introduction
2 Introduction Introduction The Hart Scientific Model 7080/7081 is a very precise constant temperature bath. The bath is specially designed for low temperature applications. An inno- vative state of the art solid-state temperature controller has been incorporated which maintains the bath temperature with extreme stability. The controller uses a microprocessor to execute the many operating functions. - Page 16 Digital remote communications is optionally available with a RS-232 or IEEE-488 interface. The tank for the 7080/7081 is stainless steel. The 7080 holds 25 liters and the 7081 holds 44 liters. There are two lids available: the standard lid with a rectan-...
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Page 17: Specifications And Environmental Conditions
3 Specifications and Environmental Conditions Specifications Specifications and Environmental Conditions Specifications 7080 7081 Range -80°C to 110°C Stability ±0.0025°C at –80°C (methanol) ±0.0015°C at 0°C (methanol) ±0.0015°C at 25°C (water) ±0.003°C at 100°C (oil) Uniformity ±0.007°C at –80°C (methanol) ±0.005°C at 0°C (methanol) ±0.003°C at 25°C (water) -
Page 18: Warranty
• altitude less than 2,000 meters Warranty Fluke Corporation, Hart Scientific Division (Hart) warrants this product to be free from defects in material and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment. -
Page 19: Quick Start
Incorrect handling can damage the bath and void the warranty.This chapter gives a brief summary of the steps required to set up and operate the 7080 or 7081 bath. This should be used as a general overview and reference and not as a substitute for the remainder of the manual. -
Page 20: Power
7080/7081 Calibration Bath User’s Guide Figure 2 Semi-hermetic Compressor for detailed instructions for proper installation of the bath. Be sure to place the bath in a safe, clean and level location. Fill the bath tank with an appropriate liquid. For operation at moderate bath temperatures, clean distilled water works well. -
Page 21: Setting The Temperature
4 Quick Start Setting the Temperature Setting the Temperature In the following discussion and throughout this manual a button around the word SET, UP, EXIT or DOWN indicates the panel button while the dotted box indicates the display reading. Explanation of the button or display reading are to the right of each button or display value. - Page 22 7080/7081 Calibration Bath User’s Guide The bath heats or cools until it reaches the new set-point temperature. Set the heater switch to position “HIGH” to allow the bath to more quickly reach a higher temperature. The “HIGH” setting may be necessary to reach and control at higher temperatures.
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Page 23: Installation
IEC 1010-1. Bath Preparation and Filling The Model 7080/7081 Bath is not provided with a fluid. Various fluids are available from Hart Scientific and other sources. Depending on the desired tem- perature range, any of the following fluids, as well as others, may be used in... -
Page 24: Probe
7080/7081 Calibration Bath User’s Guide • Water • Ethylene Glycol/Water • Methanol • Halocarbon 0.8 • Mineral oil • Silicone oil Fluids are discussed in detail in Section 8.1. Remove the access hole cover from the bath and check the tank for foreign matter (dirt, remnant packing material, etc.). - Page 25 5 Installation Power Plug the stirring motor power cord into the stirrer socket at the back of the bath. Set the heater switch on the front panel to the “LOW” position. Set the cooling switch on the front panel to the “OFF” position and turn the bath on using the power switch on the front panel.
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Page 26: Bath Use
6 Bath Use General Bath Use CAUTION: Read before placing the bath in service. The information in this section is for general information only. It is not de- signed to be the basis for calibration laboratory procedures. Each laboratory will need to write their own specific procedures. General Be sure to select the correct fluid for the temperature range of the calibration. -
Page 27: Calibration Of Multiple Probes
7080/7081 Calibration Bath User’s Guide these gradients are minimized inside the bath work area (see Section 7.4). Nev- ertheless, probes should be inserted to the same depth in the bath liquid. Be sure that all probes are inserted deep enough to prevent stem effect. From re-... -
Page 28: Parts And Controls
7 Parts and Controls Front Panel Parts and Controls Front Panel The following controls and indicators are present on the controller front panel (see Figure 3 below): (1) the digital LED display, (2) the control buttons, (3) the bath on/off power switch, (4) the control indicator light, (5) the heater power switch, and (6) the cooling power switch. -
Page 29: Refrigeration Controls
7080/7081 Calibration Bath User’s Guide 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. -
Page 30: Back Panel
7 Parts and Controls Back Panel Table 2 Temperature Chart Second Stage Cooling h resolution, set the cut-out, adjust the propor- tional band, monitor the heater output power, and program the control- ler configuration and Temperature Chart Set the Cooling Temperature to this Refrigerant Cooling Power... -
Page 31: Figure 4 Back Panel
7080/7081 Calibration Bath User’s Guide Figure 4 Back Panel 2) The stirrer power socket provides power for the stirring motor. 3) The terminal box holds the wires for connecting the bath to AC power. The bath requires 230 VAC (±10%), 50 or 60 Hz, 13 A. -
Page 32: Lid
7 Parts and Controls 7) A drain valve is provided for ease of removing the fluid media from the bath. It is advisable to use a container of adequate size to hold the full load of fluid. Some oils are more easily drained at higher temperatures. 8) The mains out of range indicator illuminates when a high/low voltage condition exists for 5 seconds indicating a fault condition. - Page 33 7080/7081 Calibration Bath User’s Guide On the optional pump lid the inlet and outlet pipes replace the rectangu- lar access hole. 4) The motor on the lid drives the stirrer on the standard lid and the pump on the optional pump lid.
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Page 34: General Operation
Bath Fluid General Operation Bath Fluid Many fluids work with 7080/7081 bath. Choosing a fluid requires consider- ation of many important characteristics of the fluid. Among these are tempera- ture range, viscosity, specific heat, thermal conductivity, thermal expansion, electrical conductivity, fluid lifetime, safety, and cost. -
Page 35: Thermal Conductivity
7080/7081 Calibration Bath User’s Guide 8.1.4 Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid. Ther- mal conductivity of the fluid affects the control stability, temperature unifor- mity, and temperature settling time. Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance. -
Page 36: Cost
8 General Operation Bath Fluid Environmentally hazardous fluids require special disposal according to applica- ble federal or local laws after use. 8.1.9 Cost Cost of bath fluids may vary greatly, from cents per gallon for water to hun- dreds of dollars per gallon for synthetic oils. Cost may be an important consid- eration when choosing a fluid. -
Page 37: Halocarbon 0.8
7080/7081 Calibration Bath User’s Guide formation below 0 °C. This is convenient for long term use. The mixture has poor electrical resistivity and so may not be suitable for some applications. The primary disadvantage with methanol is its toxicity. It is also quite flamma- ble. -
Page 38: Limitations And Disclaimer
8 General Operation Bath Fluid cal qualities important in making a selection. The list is not all inclusive, many useable fluids may not have been shown in this listing. 8.1.11.1 Limitations and Disclaimer Every effort has gone into making these charts accurate, however, the data here does not imply any guarantee of fitness of use for a particular application. -
Page 39: Table 3 Table Of Bath Fluids
7080/7081 Calibration Bath User’s Guide Table 3 Table of Bath Fluids Fluid Lower Upper Thermal Thermal (# = Hart Part No.) Temperature Temperature Flash Viscosity Specific Specific Heat Conductivity Expansion Resistivity Ω-cm ) Limit* Limit* Point (centistokes) Gravity (cal/g/°C) (cal/s/cm/°C) (cm/cm/°C) -
Page 40: Stirring
8 General Operation Stirring –100°C 0°C 100°C 200°C 300°C 400°C 500°C 600°C Silicone Oil FL 302°C 10 CS 5017 Silicone Oil FL 280°C 10 CS 5014 Silicone Oil FL 232°C 10 CS 5013 Silicone Oil FL 211°C 5012 10 CS Silicone Oil FL 133°C 10 CS... -
Page 41: Power
7080/7081 Calibration Bath User’s Guide tubing with material properties consistent with the application considering chemical and temperature compatibility. The centrifugal pump may develop 5 psi. of pressure. To maximize the flow rate use hoses with 1/2 in. or greater ID. -
Page 42: Cooling
Service Center for assistance. Cooling The Model 7080/7081 refrigeration system is a 2-stage cascade system. This means there are two individual refrigeration systems or stages. The first stage cools down or provides cooling for the second stage. The second stage cools the bath. - Page 43 7080/7081 Calibration Bath User’s Guide microcontroller automatically turns off the heater with a second mechanical re- lay anytime the bath temperature is more than a certain amount above the set-point temperature. As a second protection device, the controller is also equipped with a separate thermocouple temperature monitoring circuit which will shut off the heater if the temperature exceeds the cut-out set-point.
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Page 44: Controller Operation
9 Controller Operation Bath Temperature Controller Operation This section discusses in detail how to operate the bath temperature controller using the front control panel. Using the front panel key switches and LED dis- play the user may monitor the bath temperature, set the temperature set-point in degrees C or F, monitor the heater output power, adjust the controller propor- tional band, set the cut-out set-point, and program the probe calibration param- eters, operating parameters, serial and IEEE-488 interface configuration, and... -
Page 46: Temperature Set-Point
9 Controller Operation Temperature Set-point rESEt ? Cut-out reset function Press “SET” once more to reset the cut-out. Reset cut-out This action also switches the display to the set temperature function. To return to displaying the temperature press the “EXIT” button. If the cut-out is still in the over-temperature fault condition the display continues to flash “cut-out”. -
Page 47: Set-Point Value
7080/7081 Calibration Bath User’s Guide Press “SET” to accept the new selection and access the set-point value. Accept selected set-point memory 9.3.2 Set-point Value The set-point value may be adjusted after selecting the set-point memory and pressing “SET”. The set-point value is displayed with the units, C or F, at the left. -
Page 48: Temperature Scale Units
9 Controller Operation Temperature Scale Units New vernier setting 0.00090 Next press “EXIT” to return to the temperature display or “SET” to access the temperature scale units selection. Access scale units Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius (°C) or Fahrenheit (°F). -
Page 49: Secondary Menu
7080/7081 Calibration Bath User’s Guide Un= F New units selected Press “SET” to accept the new selection and resume displaying the bath temperature. Set the new units and resume temperature display Secondary Menu Functions which are used less often are accessed within the secondary menu. -
Page 50: Figure 8 Bath Temperature Fluctuation At Various Proportional Band Settings
9 Controller Operation Proportional Band tom of the proportional band the heater output is 100%. At the top of the pro- portional band the heater output is 0. Thus as the bath temperature rises the heater power is reduced, which consequently tends to lower the temperature back down. -
Page 51: Table 4 Proportional Band - Fluid Table
7080/7081 Calibration Bath User’s Guide band width from this point to 3 or 4 times wider. Table 4 lists typical propor- tional band settings for optimum performance with a variety of fluids at selected temperatures. Table 4 Proportional Band — Fluid Table... -
Page 52: Cut-Out
9 Controller Operation Cut-out Accept the new proportional band setting Cut-out As a protection against software or hardware fault, shorted heater triac, or user error, the bath is equipped with an adjustable heater cut-out device that shuts off power to the heater if the bath temperature exceeds a set value. This protects the heater and bath materials from excessive temperatures and, most impor- tantly, protects the bath fluids from being heated beyond the safe operating temperature preventing hazardous vaporization, breakdown, or ignition of the... -
Page 53: Controller Configuration
7080/7081 Calibration Bath User’s Guide Decrement display New cut-out set-point CO= 95C To accept the new cut-out set-point press “SET”. Accept cut-out set-point The next function is the configuration menu. Press “EXIT” to resume display- ing the bath temperature. Controller Configuration The controller has a number of configuration and operating options and calibra- tion parameters which are programmable via the front panel. -
Page 54: Alpha
9 Controller Operation Operating Parameters 9.10.2 ALPHA This probe parameter refers to the average sensitivity of the probe between 0 and 100°C. Normally this is set for 0.00385°C 9.11 Operating Parameters The operating parameters menu is indicated by, Operating parameters menu Press “SET”... -
Page 55: Sample Period
7080/7081 Calibration Bath User’s Guide The BAUD rate parameter is indicated by, BAUd Serial BAUD rate parameter Press “SET” to choose to set the BAUD rate. The current BAUD rate value will then be displayed. Current BAUD rate 1200 b The BAUD rate of the bath serial communications may be programmed to 300,600,1200, or 2400 BAUD. -
Page 56: Linefeed
9 Controller Operation IEEE-488 Parameters Menu dUPL Serial duplex mode parameter Press “SET” to access the mode setting. dUP=FULL Current duplex mode setting The mode may be changed using “UP” or “DOWN” and pressing “SET”. New duplex mode setting dUP=HALF 9.12.4 Linefeed The final parameter in the serial interface menu is the linefeed mode. -
Page 57: Calibration Parameters
9.14.1 Parameter CTO sets the limit of the over-temperature cut-out. This is not ad- justable by software but is adjusted with an internal potentiometer. For the 7080/7081 baths this parameter should read between 110 and 130. 9.14.2 BO and BG These parameters calibrate the accuracy of the bath set-point. -
Page 58: Digital Communication Interface
Serial Communications Digital Communication Interface If supplied with the option, the 7080/7081 bath is capable of communicating with and being controlled by other equipment through the digital interface. Two types of digital interface are available — the RS-232 serial interface and the IEEE-488 GPIB interface. -
Page 59: Baud Rate
7080/7081 Calibration Bath User’s Guide Figure 9 Serial Cable Wiring repeatedly until the serial interface menu is indicated with “SErIAL”. Finally press “SET” to enter the serial parameter menu. In the serial interface parame- ters menu are the BAUD rate, the sample rate, the duplex mode, and the line- feed parameter. -
Page 60: Sample Period
10 Digital Communication Interface IEEE-488 Communication (optional) 10.1.2.2 Sample Period The 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 the sample rate is set to 5, the bath transmits the current measurement over the serial interface approxi- mately every five seconds. -
Page 61: Ieee-488 Interface Address
7080/7081 Calibration Bath User’s Guide To enter the IEEE-488 parameter programming menu first press “EXIT” while pressing “SET” and release to enter the secondary menu. Press “SET” repeat- edly until the display reaches “PrObE”. This is the menu selection. Press “UP”... -
Page 62: Table 5 Interface Command Summary
10 Digital Communication Interface Power Control Functions Table 5 Interface Command Summary Command Command Returned Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set-point s[etpoint] set: 9999.99 {C or F} Set current set-point to n s[etpoint]=n Instrument Range Read vernier v[ernier]... -
Page 63: Table 5 Interface Command Summary Continued
[] Optional Command data “HIGH”, and adjusting the cooling temperature pressure to 5 psi. Otherwise, the interface would not be able to switch these functions off. The 7080/7081 bath has five control functions with the digital interface. These are 1) heater power high/low, 2) cooling on/off, 3) expansion valve 1 open/closed, 4) cooling power high/low, and 5) expansion valve 2 open/closed. -
Page 64: Heater Control
10 Digital Communication Interface Power Control Functions 10.4.1 Heater Control To control the heater with the digital interface the front panel heater switch must be set to LOW (500 W). The heater function is controlled with the “F1" command. Setting the “F1" parameter to 0 sets the heater to LOW (500 W) and setting it to 1 sets the heater to HIGH (1000 W). -
Page 65: Table 7 Temperature Range Control Functions
7080/7081 Calibration Bath User’s Guide Table 7 Temperature Range Control Functions Bath Temperature Cooling Expansion Expansion Pressure Setting Range (°C) Heating Cooling Power Valve 1 Valve 2 (Front Panel) † -80 to -40 high 3 psi (Front Panel -40 to -15... -
Page 66: Calibration Procedure
11 Calibration Procedure Calibration Points Calibration Procedure In some instances the user may want to calibrate the bath to improve the tem- perature set-point accuracy. Calibration is done by adjusting the controller probe calibration constants R0 and ALPHA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set-point. -
Page 67: Calibration Example
7080/7081 Calibration Bath User’s Guide The user should keep a record of these values in case they may need to be re- ′ and ALPHA′, are computed by enter- stored in the future. The new values, R ing the old values for R... -
Page 68: Figure 10 Sample Calibration Computations
11 Calibration Procedure Calibration Example temperatures are 29.843 and 79.914°C respectively. Refer to Figure 10 for ap- plying equations to the example data and computing the new probe constants. R0 = 100.000 ALPHA = 0.0038500 = 30.00°C measured t = 29.843°C = 80.00°C measured t = 79.914°C Compute errors,... -
Page 69: Maintenance
12 Maintenance Maintenance The calibration instrument has been designed with the utmost care. Ease of op- eration and simplicity of maintenance have been a central theme in the product development. Therefore, with proper care the instrument should require very little maintenance. Avoid operating the instrument in dirty or dusty environments. -
Page 70: Draining The Bath
7080/7081 Calibration Bath User’s Guide plicable to all fluids used in the baths should be kept in close proximity to the instrument. • If the mains supply cord becomes damaged, replace it with a cord with the appropriate gauge wire for the current of the bath. If there are any questions, call an Authorized Service Center for more information. -
Page 71: Troubleshooting
13 Troubleshooting Troubleshooting Troubleshooting In the event the bath appears to function abnormally this section may help to find and solve the problem. Several possible problem conditions are described along with likely causes and solutions. If a problem arises please read this sec- tion carefully and attempt to understand and solve the problem. - Page 72 7080/7081 Calibration Bath User’s Guide Problem Causes and Solutions The controller display If the display flashes “CUT-OUT” alternately with the correct process tempera- flashes “CUT-OUT” and ture, check the following: the heater does not operate Wrong cut-out setting. The cut-out disconnects power to the heaters when the bath temperature exceeds the cut-out set-point.
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Page 73: Troubleshooting
13 Troubleshooting Troubleshooting Problem Causes and Solutions The controller controls or If the controller appears to operate normally except that the bath’s temperature attempts to control at an does not agree with the temperature measured by the user’s reference ther- inaccurate temperature mometer to within the specified accuracy, consider the following: Erroneous parameters. -
Page 74: Comments
7080/7081 Calibration Bath User’s Guide Problem Causes and Solutions The bath does not Too much heating. Check that the control indicator glows green showing that achieve low temperatures the controller is attempting to cool. The heaters may be disabled as a test by temporarily removing the heater fuses. -
Page 75: Emission Testing
13 Troubleshooting Comments 13.2.1.1 Emission Testing The instrument fulfills the limit requirements for Class A equipment but does not fulfill the limit requirements for Class B equipment. The instrument was not designed to be used in domestic establishments. 13.2.2 Low Voltage Directive (Safety) In order to comply with the European Low Voltage Directive (73/23/EEC), Hart Scientific equipment has been designed to meet the IEC 1010-1 (EN 61010-1) and the IEC 1010-2-010 (EN 61010-2-010) standards.