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Summary of Contents for Fluke 7038
- Page 1 7037/ 7038/ 7040/7041 Calibration Bath User's Guide PN 3720842 October 2014 © 2014 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
- Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.
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Page 3: Table Of Contents
Table of Contents 1 Before You Start ......1 Symbols Used ......1 Safety Information . - Page 4 8 General Operation ......27 Bath Fluid ......27 8.1.1 Temperature Range .
- Page 5 9.12.1 Baud Rate ........47 9.12.2 Sample Period.
- Page 6 Figures and Tables Figure 1 Bath Assembly ......9 Figure 2 Front Panel .
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Page 7: 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 8: Safety Information
7037/7038/7040/7041 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 9 1 Before You Start Safety Information Before initial use, or after transport, or after storage in humid or semi-humid environments, or anytime the instrument has not been energized for more than 10 days, the instrument needs to be energized for a “dry-out” period of 2 hours before it can be assumed to meet all of the safety requirements of the IEC 61010-1.
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Page 10: Cautions
7037/7038/7040/7041 Calibration Bath User’s Guide DO use a ground fault interrupt device. This instrument contains a fluid. A ground fault device is advised in case fluid is present in the electrical system and could cause an electrical shock. Always replace the power cord with an approved cord of the correct rating and type. -
Page 11: 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... - Page 12 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...
- Page 13 1 Before You Start Authorized Service Centers • Model Number • Serial Number • Voltage • Complete description of the problem...
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Page 14: Introduction
2 Introduction Introduction The Hart Scientific Model 7037/7038/7040/7041 are very precise constant tem- perature baths. An innovative state of the art solid-state temperature controller has been incorporated which maintains the bath temperature with extreme sta- bility. The controller uses a microcontroller to execute the many operating functions. -
Page 15: Specifications And Warranty
3 Specifications and Warranty Specifications Specifications and Warranty Specifications Specifications 7037 7038 7040 7041 Operating Range –40°C to 110°C –10°C to 110°C –40°C to 110°C Stability ±0.002°C at –-40°C (ethanol) ±0.0015°C at 25°C (water) ±0.003°C at 100°C (oil 5012) Uniformity ±0.004°C at –40°C (ethanol) -
Page 16: Environmental Conditions
7037/7038/7040/7041 Calibration Bath User’s Guide Environmental Conditions Although the instrument has been designed for optimum durability and trou- ble-free operation, it must be handled with care. The instrument should not be operated in an excessively dusty or dirty environment. Maintenance and clean- ing recommendations can be found in the Maintenance Section of this manual. -
Page 17: Quick Start
Unpack the bath carefully and inspect it for any damage that may have oc- curred during shipment. If there is shipping damage, notify the carrier immediately. Verify that all components are present: • 7037/7038/7040/7041 Bath • Controller Probe • Access Hole Cover • User’s Guide •... -
Page 18: Power
7037/7038/7040/7041 Calibration Bath User’s Guide Power Plug the bath power cord into a mains outlet of the proper voltage, frequency, and current capability (see Section 3.1, Specifications). Refer to and read the CAUTION at the front of the manual concerning brownout and over voltage protection. - Page 19 4 Quick Start Setting the Temperature Press “SET” to accept the new value and display the vernier value. The bath be- gins heating or cooling to the new set-point. Store new set-point, access vernier 0.00000 Current vernier value Press “EXIT” and the bath temperature will be displayed again. Return to the temperature display Bath temperature display 24.73 C...
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Page 20: Installation
5 Installation Bath Environment Installation CAUTION: READ SECTION 6 ENTITLED “BATH USE” before placing the bath in service. Incorrect handling can damage the bath and void the warranty. This bath is not designed to be portable. Therefore, moving the bath once it has been installed should be kept to a minimum. -
Page 21: Probe
7037/7038/7040/7041 Calibration Bath User’s Guide • Water • Ethylene Glycol/Water • Methanol • Mineral oil • Silicone oil Fluids are discussed in detail in Section 8.1. Remove any access hole cover from the bath and check the tank for foreign matter (dirt, remnant packing material, etc.). -
Page 22: Bath Use
6 Bath Use General Bath Use 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 23: Calibration Of Multiple Probes
7037/7038/7040/7041 Calibration Bath User’s Guide these gradients are minimized inside the bath work area. Nevertheless, 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 research at Hart Scien- tific, we suggest a general rule-of-thumb for immersion depth to reduce the stem effect to a minimum: 15 x the diameter of the UUT + the sensor length. -
Page 24: Parts And Controls
7 Parts and Controls Front Control Panel Parts and Controls Front Control Panel The following controls and indicators are present on the controller front panel (see Figure 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 25: Side Panel
7037/7038/7040/7041 Calibration Bath User’s Guide the heater is on. When the indicator is green the heater is off and the bath is cooling. (5) The heater power switch is used to select the appropriate heater power lev- els for heating and controlling the bath at various temperatures. -
Page 26: Back Panel
7 Parts and Controls Back Panel 2) The cooling temperature regulating valve is used to adjust the tempera- ture at which the refrigerant evaporates, which determines cooling effi- ciency. Refer to the label below the gauge for approximate psi and evaporative temperature settings. -
Page 27: Figure 4 Back Panel
7037/7038/7040/7041 Calibration Bath User’s Guide indicator. The system fuses are 20 amps for 115 V operation and 10 amps for 230 V operation. These fuses are internal. Figure 4 Back Panel 1) The probe connector in the back panel is used for the temperature con- troller probe. -
Page 28: Bath Tank And Lid
7 Parts and Controls Bath Tank and Lid 5) The serial number is located on the upper right corner of the back panel. The series is also stamped on this panel. When consulting with an Au- thorized Service Center, use the model number and the serial number. 6) If the bath is supplied with a serial RS-232 interface, the interface cable is attached to the back of the bath at the connector labeled “Serial Port”. -
Page 29: Figure 5 Drain Location And Lid Options
7037/7038/7040/7041 Calibration Bath User’s Guide Figure 5 Drain Location and Lid Options WARNING: Extreme caution must be maintained to prevent harm to the user or the surrounding environment. Do not exceed a 120°C fluid temper- ature for draining. The valve could be damaged if 120°C is exceeded. -
Page 30: General Operation
8 General Operation Bath Fluid General Operation Bath Fluid Many fluids will work with your bath. Choosing a fluid requires consideration of many important characteristics of the fluid. Among these are temperature range, viscosity, specific heat, thermal conductivity, thermal expansion, electri- cal resistivity, fluid lifetime, safety, and cost. -
Page 31: Thermal Conductivity
7037/7038/7040/7041 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 probe temperature settling time. Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance. -
Page 32: Cost
8 General Operation Bath Fluid side the tank and the open cup represents the vapors escaping the tank. Oxygen and an ignition source will be less available inside the tank. 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-... -
Page 33: Silicone Oil
7037/7038/7040/7041 Calibration Bath User’s Guide hood should be used. As with most oils mineral oil expands as temperature in- creases so be careful not to fill the bath too full that it overflows when heated. The viscosity and thermal characteristics of mineral oil is poorer than water so temperature stability will not be as good. -
Page 34: Table 2 Table Of Various Bath Fluids And Their Properties
8 General Operation Bath Fluid Table 2 Table of various bath fluids and their properties Fluid Lower Upper Specific Heat Thermal Thermal (# = Hart Part Temperature Temperature Flash Viscosity Specific (cal/g/°C) Conductivity Expansion Resistivity Ω-cm ) No.) Limit* Limit* Point (centistokes) Gravity... -
Page 35: Figure 6 Chart Of Various Bath Fluids And Their Properties
7037/7038/7040/7041 Calibration Bath User’s Guide –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 10 CS... -
Page 36: Stirring
8 General Operation Stirring Flash Point: The point at which ignition may occur. See flash point discussion in Section 8.1.8. The point shown may be either the open or closed cup flash point. Boiling Point: At the boiling point of the fluid the temperature stability is diffi- cult to maintain. -
Page 37: Cooling
7037/7038/7040/7041 Calibration Bath User’s Guide heater is off. The indicator will pulse constantly when the bath is maintaining a stable temperature. The heater has two power level settings. The “HIGH” heater power setting is used to quickly heat up the bath fluid to the desired operating temperature. The “HIGH”... - Page 38 8 General Operation Temperature Controller The controller allows the operator to set the bath temperature with high resolu- tion, set 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 degrees Celsius or Fahr- enheit.
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Page 39: 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 40: Figure 7 Controller Operation Flow Chart
7037/7038/7040/7041 Calibration Bath User’s Guide Figure 7 Controller Operation Flow Chart... -
Page 41: Temperature Set-Point
9 Controller Operation Temperature Set-point rESEt ? cutout reset function Press “SET” once more to reset the cutout. Reset cutout The display is also switched to the set temperature function. To return to dis- playing the temperature press the “EXIT” button. If the cutout is still in the over-temperature fault condition, the display continues to flash “Cut-out”. -
Page 42: Set-Point Value
7037/7038/7040/7041 Calibration Bath User’s Guide 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. 40.00 Set-point 4 value in °C If the set-point value need not be changed then press “EXIT”... -
Page 43: Temperature Scale Units
9 Controller Operation Temperature 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). These units are used in displaying the bath temperature, set-point, vernier, proportional band, and cutout set-point. The temperature scale units selection is accessed after the vernier adjustment function by pressing “SET”. -
Page 44: Heater Power
7037/7038/7040/7041 Calibration Bath User’s Guide 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 time to the pulse cycle time. This value may be estimated by watching the red/green control indicator light or read di- rectly from the digital display. -
Page 45: Figure 8 Bath Temperature Fluctuation At Various Proportional Band Settings
9 Controller Operation Proportional Band Figure 8 Bath temperature fluctuation at various proportional band settings The proportional band should be wider when the higher power setting is used so that the change in output power per change in temperature remains the same. The proportional band should also be wider when the fluid viscosity is higher because of the increased response time. -
Page 46: Cutout
7037/7038/7040/7041 Calibration Bath User’s Guide The proportional band adjustment may be accessed within the secondary menu. Press “SET” and “EXIT” to enter the secondary menu and show the heater power. Then press “SET” to access the proportional band. Access heater power in secondary menu... -
Page 47: Controller Configuration
9 Controller Operation Controller Configuration The cutout 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. Access heater power in secondary menu Heater power in percent 12 Pct Access proportional band... -
Page 48: Alpha
7037/7038/7040/7041 Calibration Bath User’s Guide tionship of the platinum control probe. These parameters may be adjusted to improve the accuracy of the bath. This procedure is explained in detail in Sec- tion 11. The probe parameters are accessed by pressing “SET” after the name of the pa- rameter is displayed. -
Page 49: Serial Interface Parameters
9 Controller Operation Serial Interface Parameters 9.12 Serial Interface Parameters The serial RS-232 interface parameters menu is indicated by, Serial RS-232 interface parameters menu SErIAL The serial interface parameters menu contains parameters which determine the operation of the serial interface. These controls only apply to baths fitted with the serial interface. -
Page 50: Duplex Mode
7037/7038/7040/7041 Calibration Bath User’s Guide Current sample period (seconds) SA= 1 Adjust the value with “UP” or “DOWN” and then use “SET” to set the sample rate to the displayed value. New sample period SA= 60 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. -
Page 51: Ieee-488 Parameters
9 Controller Operation IEEE-488 Parameters 9.13 IEEE-488 Parameters Baths may optionally be fitted with an IEEE-488 GPIB interface. In this case the user may set the interface address within the IEEE-488 parameter menu. This menu does not appear on baths not fitted with the interface. The menu is indicated by, IEEE-488 parameters menu IEEE... -
Page 52: Cto
7037/7038/7040/7041 Calibration Bath User’s Guide 9.14.1 Parameter CTO sets the calibration of the over-temperature cutout. This is not adjustable by software but is adjusted with an internal potentiometer. 9.14.2 BO and BG These parameters calibrate the accuracy of the bath set-point. These are pro- grammed at the factory when the bath is calibrated. -
Page 53: Digital Communication Interface
10 Digital Communication Interface Serial Communications Digital Communication Interface If supplied with the option, the bath is capable of communicating with and be- ing 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 54: Baud Rate
7037/7038/7040/7041 Calibration Bath User’s Guide pressing “SET” and release to enter the secondary menu. Press “SET” repeat- edly until the display reads “ProbE”. This is the menu selection. Press “UP” repeatedly until the serial interface menu is indicated with “SErIAL”. Finally press “SET”... -
Page 55: Ieee-488 Communication (Optional)
10 Digital Communication Interface IEEE-488 Communication (optional) interface to set the bath and view or program the various parameters. The inter- face commands are discussed in Section 10.3. All commands are ASCII charac- ter strings terminated with a carriage-return character (CR, ASCII 13). 10.2 IEEE-488 Communication (optional) The IEEE-488 interface is available as an option. -
Page 56: Interface Command Summary
7037/7038/7040/7041 Calibration Bath User’s Guide Table 4 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: 150.00 C Set current set-point to n... -
Page 57: Interface Command Summary Continued
10 Digital Communication Interface Interface Commands Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set cutout to be reset cm[ode]=a[uto] cm=a automatically Serial Interface Menu Read serial sample setting sa[mple] sa: 9 sa: 1 Set serial sampling setting to n sa[mple]=n sa=0... -
Page 58: Power Control Functions
7037/7038/7040/7041 Calibration Bath User’s Guide Interface Command Summary continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Set Expansion Valve 1 to off f3= n f3=0 Read Cooling Power f4:9 f4:1 Set Back Pressure f4=1/0 0 or 1... -
Page 59: 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 60: Full Remote Operation
7037/7038/7040/7041 Calibration Bath User’s Guide 10.4.3 Full Remote Operation The back pressure valve knob is used to control the cooling power of the bath at higher temperatures. Normally, it is enabled for manual operation and it is adjusted to its full counterclockwise range for maximum cooling power. -
Page 61: 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 R and ALPHA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set-point. -
Page 62: Calibration Example
7037/7038/7040/7041 Calibration Bath User’s Guide menu from the controller panel or by inquiring through the digital interface. The user should keep a record of these values in case they may need to be re- stored in the future. The new values R... -
Page 63: Figure 10 Calibration Example
11 Calibration Procedure Calibration Example = 100.000 ALPHA = 0.0038500 = 30.00°C measured t = 29.843°C = 80.00°C measured t = 79.914°C Compute errors, = 29.843 - 30.00°C = -0.157°C = 79.914 - 80.00°C = -0.086°C Compute R − × −... -
Page 64: 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 65 7037/7038/7040/7041 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, contact an Authorized Service Center for more information.
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Page 66: Troubleshooting
13 Troubleshooting Troubleshooting Troubleshooting This section contains information on troubleshooting and CE Comments 13.1 Troubleshooting In the event that the instrument 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 section carefully and attempt to understand and solve the problem. - Page 67 7037/7038/7040/7041 Calibration Bath User’s Guide Problem Causes and Solutions The display flashes “cutout” and The problem may be that the controller’s voltmeter circuit is not func- an incorrect process temperature tioning properly. A problem could exist with the memory back-up bat- tery.
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Page 68: Comments
13 Troubleshooting Comments Problem Causes and Solutions The controller shows that the out- If the bath temperature does not achieve the expected degree of sta- put power is steady but the pro- bility when measured using a thermometer, try adjusting the propor- cess temperature is unstable tional band to a narrower width as discussed in Section 9.7. -
Page 69: Low Voltage Directive (Safety)
7037/7038/7040/7041 Calibration Bath User’s Guide Declaration of Conformity for your instrument lists the specific standards to which the unit was tested. 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...
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