Related Manuals for Fluke 7380
Summary of Contents for Fluke 7380
- Page 1 7380 Ultra Low Temp Bath User’s Guide January 2013 © 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
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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 ......25 Heat Transfer Fluid ......25 8.1.1 Temperature Range .
- Page 5 9.9.3 Cooling ........43 9.10 Serial Interface Parameters .
- Page 6 Figures Figure 1 Front Panel ....... . 21 Figure 2 Back Panel .
- Page 7 Tables Table 1 International Electrical Symbols ..... 1 Table 2 Table of Various Bath Fluids ..... . . 31 Table 3 Controller Communications Commands .
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Page 8: 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 9: Safety Information
7380 Ultra Low Temp 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 10 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 degree centigrade for 4 hours or more.
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Page 11: Cautions
7380 Ultra Low Temp Bath User’s Guide • The unit 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 unit operation. -
Page 12: Authorized Service Centers
Voltage Cutout: ±12.5% (203 - 257 VAC) ♦ 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... - Page 13 7380 Ultra Low Temp Bath User’s Guide American Fork, UT 84003-9775 Phone: +1.801.763.1600 Telefax: +1.801.763.1010 E-mail: support@hartscientific.com Fluke Nederland B.V. Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone: +31-402-675300 Telefax: +31-402-675321 E-mail: ServiceDesk@fluke.nl Fluke Int'l Corporation...
- Page 14 1 Before You Start Authorized Service Centers 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 problem...
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Page 15: Introduction
2 Introduction Introduction The Hart Scientific 7380 is an ultra low temp bath useful in temperature cali- bration and other applications requiring stable temperatures. An innovative state of the art solid-state temperature controller has been incorporated which maintains the bath temperature with extreme stability. The temperature control- ler uses a micro-controller to execute the many operating functions. -
Page 16: Specifications And Environmental Conditions
3 Specifications and Environmental Conditions Specifications Specifications and Environmental Conditions Specifications Range –80°C to 100°C (–112°F to 212°F) Ambient Operating Range 15°C to 25°C (59°F to 77°F) Stability (2 sigma) ±0.006°C at –80°C (ethanol) ±0.010°C at 0°C (ethanol) ±0.010°C at 100°C (oil 5012) ±0.008°C at –80°C (ethanol) Uniformity ±0.012°C at 0°C (ethanol) -
Page 18: Warranty
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 immedi- ately. Verify that all components are present: • 7380 Bath • RS-232 Cable • Access Hole Cover •... -
Page 19: Power
7380 Ultra Low Temp Bath User’s Guide structions 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 oper- ation at moderate bath temperatures, clean distilled water works well. For lower temperatures, ethanol (denatured) works well but is NOT USABLE AT HIGHER TEMPERATURES due to flammability. - Page 20 4 Quick Start Setting the Temperature Access set-point value C 25.00 Current value of set-point 1, 25.00°C Press “UP” or “DOWN” to change the set-point value. Increment display New set-point value C 30.00 Press SET to accept the new value. The bath begins heating or cooling to the new set-point.
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Page 21: Installation
Bath Environment The Model 7380 Bath is a precision instrument which should be located in an appropriate environment. The location should be free of drafts, extreme temper- atures and temperature changes, dirt, etc. The surface where the bath is placed must be level. -
Page 22: Power
7380 Ultra Low Temp Bath User’s Guide • Mineral oil • Silicone oil • Halocarbon 0.8 Caution: Ensure the valve handle is in the closed position before attempt- ing to add fluid to the tank. Fluids are discussed in detail in Section 8.1. -
Page 23: Bath Use
6 Bath Use General Bath Use CAUTION: READ this section BEFORE PLACING THE BATH IN SER- VICE. 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 should write their own specific procedures. -
Page 24: Calibration Of Multiple Probes
7380 Ultra Low Temp Bath User’s Guide tally eliminated. Even though all baths have horizontal and vertical gradients, 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. - Page 25 7380 HIGH PRECISION BATH –80°C to 100°C...
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Page 26: Bath Tank And Lid
7380 Ultra Low Temp Bath User’s Guide indicator is lit the heater is on, and when it is off the heater is off and the bath is cooling. 5) The cooling switch turns on the refrigeration for control below 50°C and rapid cool down. - Page 27 FLUKE CORPORATION EVERETT, WA USA www.flukecal.com...
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Page 28: General Operation
Heat Transfer Fluid General Operation Heat Transfer Fluid Many fluids work with the 7380 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 29: Specific Heat
7380 Ultra Low Temp Bath User’s Guide 8.1.3 Specific Heat Specific heat is the measure of the heat storage ability of the fluid. Specific heat, to a small degree, affects the control stability. It also affects the heating and cooling rates. Generally, a lower specific heat means quicker heating and cooling. -
Page 30: Cost
8 General Operation Heat Transfer Fluid WARNING: Fluids at high temperatures may pose danger from BURNS, FIRE, and TOXIC FUMES. Use appropriate caution and safety equip- ment. Read the MSDS sheets. Fluids may be flammable and require special fire safety equipment and proce- dures. -
Page 31: Mineral Oil
7380 Ultra Low Temp Bath User’s Guide ity, vapors, and flammability at temperatures higher than 10°C are significant issues that must be considered. 8.1.10.3 Mineral Oil Mineral oil or paraffin oil is often used at moderate temperatures above the range of water. Mineral oil is relatively inexpensive. At lower temperatures mineral oil is quite viscous and control may be poor. -
Page 32: Limitations And Disclaimer
8 General Operation Heat Transfer Fluid 8.1.11.1 Limitations and Disclaimer The information given in this manual regarding fluids is intended only to be used as a general guide in choosing a fluid. Though every effort has been made to provide correct information we cannot guarantee accuracy of data or assure suitability of a fluid for a particular application. -
Page 33: Stirring
7380 Ultra Low Temp Bath User’s Guide Figure 3 Chart of Various Bath Fluids Decomposition: The temperature may reach a point at which decomposition of the fluid begins. Further increasing the temperature may accelerate decomposi- tion to the point of danger or impracticality. -
Page 34: Power
8 General Operation Power Table 2 Table of Various 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) Halocarbon 0.8 –90°C (v)**... -
Page 35: Heater
7380 Ultra Low Temp Bath User’s Guide controller hardware configuration. This data is used in some circumstances for diagnostic purposes. Heater The power to the bath heater is precisely controlled by the temperature control- ler to maintain a constant bath temperature. Power is controlled by periodically switching the heater on for a certain amount of time using a solid-state relay. -
Page 36: Temperature Controller
8 General Operation Temperature Controller Section 1.3). If you desire to use your own refrigeration technician, a Ser- vice Center can try to assist by phone. • The compressor manufacturer does not warranty their compressors when used with non-standard refrigerants. Warranty of these compressors must be handled through a Hart Authorized Service Center only. -
Page 37: 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, and program the calibration parameters, operating parameters, and serial interface configuration. -
Page 38: Figure 4 Controller Operation Flowchart
7380 Ultra Low Temp Bath User’s Guide Display Temperature DOWN Select Setpoint Display of Rs Adjust Setpoint Toggles °C / °F EXIT Units °C/°F Secondary Functions EXIT Scan On/Off EXIT EXIT Display Power Scan Rate Set Proportional Band Menu Set Cut-out Temp... -
Page 39: Set-Point Value
9 Controller Operation Temperature Set-point number of the set-point memory currently being used is shown at the left on the display followed by the current set-point value. Bath temperature in degrees Celsius 10.00C Access set-point memory Set-point memory 1, 25°C currently used 1. -
Page 40: Scan
7380 Ultra Low Temp Bath User’s Guide Press “UP” or “DOWN” to change the units. Un= F New units selected Scan The scan rate can be set and enabled so that when the set-point is changed the bath heats or cools at a specified rate (degrees per minute) until it reaches the new set-point. -
Page 41: Secondary Menu
9 Controller Operation Secondary Menu Secondary Menu Functions which are used less often are accessed within the secondary menu. The secondary menu is accessed by pressing “SET” and “EXIT” simulta- neously and then releasing. The first function in the secondary menu is the heater power display. -
Page 42: Cutout
7380 Ultra Low Temp Bath User’s Guide If the band is too wide, the temperature deviates excessively from the set-point due to varying external conditions. This is due to the power output changing very little with temperature and the controller cannot respond very well to changing conditions or noise in the system. -
Page 43: Controller Configuration
9 Controller Operation Controller Configuration fluid from excessive temperatures. The cutout temperature is programmable by the operator from the front panel of the controller. The cutout should be set to the temperature limits of the selected fluid. If the cutout is activated because of excessive temperature then power to the heater shuts off and the instrument cools. -
Page 44: Operating Parameters
7380 Ultra Low Temp Bath User’s Guide bration parameters. The menus are selected using the “UP” and “DOWN” keys and then pressing “SET”. (See Figure 4 on page 36.) Operating Parameters The operating parameters menu is indicated by, Operating parameters menu The operating parameters menu contains the High Limit, Stir Speed, and Cool- ing parameters. -
Page 45: Cooling
9 Controller Operation Serial Interface Parameters Adjust the LL parameter using “UP” or “DOWN”. L=-20 New LL setting Press “SET” to accept the new temperature limit. 9.9.3 Cooling This menu function allows the operator to disable cooling and corresponds to the remote cooling control function (see Table 3). -
Page 46: Sample Period
7380 Ultra Low Temp Bath User’s Guide The BAUD rate of the serial communications may be programmed to 300, 600, 1200, 2400, 4800, or 9600 BAUD. Use “UP” or “DOWN” to change the BAUD rate value. New BAUD rate 4800 b Press “SET”... -
Page 47: Linefeed
LF= OFF 9.11 Calibration Parameters The operator of the 7380 controller has access to the Hard Cutout and a number of the bath calibration constants namely R , ALPHA, DELTA, and BETA. These values are set at the factory and should not be altered. The correct values are important to the accuracy and proper and safe operation of the bath. -
Page 48: Alpha
7380 Ultra Low Temp Bath User’s Guide through the instrument menu or the communications port and is not user settable. 9.11.2 This probe parameter refers to the resistance of the control probe at 0°C. The value of this parameter is set at the factory for best instrument accuracy. -
Page 49: Digital Communication Interface
Serial Communications Digital Communication Interface The 7380 Bath calibrator is capable of communicating with and being con- trolled by other equipment through the digital serial interface. With a digital interface the instrument may be connected to a computer or other equipment. -
Page 50: Baud Rate
7380 Ultra Low Temp Bath User’s Guide To enter the serial parameter programming mode first press “EXIT” while pressing “SET” and release to enter the secondary menu. Press “SET” repeat- edly until the display reads “PAr”. Press “UP” until the serial interface menu is indicated with“SErIAL”. -
Page 51: Interface Commands
10 Digital Communication Interface Interface Commands rate. The serial communications uses 8 data bits, one stop bit, and no parity. The set-point and other commands may be sent via the serial interface to set the temperature set-point and view or program the various parameters. The inter- face commands are discussed in Section10.2. -
Page 52: Table 3 Controller Communications Commands
7380 Ultra Low Temp Bath User’s Guide Table 3 Controller Communications Commands Command Command Returned Acceptable Command Description Format Example Returned Example Values Display Temperature Read current set-point s[etpoint] set: 999.99 {C or F} set: 90.00 C Set current set-point to n s[etpoint]=n s=80.00... -
Page 53: Table 3 Controller Communications Commands Continued
10 Digital Communication Interface Interface Commands Controller Communications Commands continued Command Command Returned Acceptable Command Description Format Example Returned Example Values Calibration Menu Read R0 calibration parameter r[0] r0: 999.999 r0: 100.578 Set R0 calibration parameter to n r[0]=n r=100.324 90 to 110 Read ALPHA calibration al[pha]... -
Page 54: Calibration Procedure
11 Calibration Procedure Calibration Procedure Calibration Procedure Note: This procedure is to be considered a general guideline. Each labo- ratory should write their own procedure based on their equipment and their quality program. Each procedure should be accompanied by an un- certainty analysis also based on the laboratory's equipment and environ- ment. - Page 55 7380 Ultra Low Temp Bath User’s Guide standard thermometer match the set-point. The approximate ratio between a change in ALPHA and a change in temperature at 100°C is about 0.00004 to 1. For example, if the bath temperature is high by 0.1°C at 100°C then decrease ALPHA by 0.000004.
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Page 56: Maintenance
12 Maintenance Maintenance • The calibration instrument has been designed with the utmost care. Ease of operation 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 57 7380 Ultra Low Temp Bath User’s Guide remove the dirt. Do not use compressed air as it might drive the dirt be- tween the fins where it may become lodged preventing airflow. • If the instrument is used in a manner not in accordance with the equip- ment design, the operation of the bath may be impaired or safety hazards may arise.
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Page 58: Troubleshooting
13 Troubleshooting Troubleshooting Troubleshooting If problems arise while operating the 7380, this section provides some sugges- tions that may help you solve the problem. A wiring diagram is also included. 13.1 Troubleshooting Below are several situations that may arise followed by suggested actions to take for fixing the problem. -
Page 59: Ce Comments
7380 Ultra Low Temp Bath User’s Guide Problem Possible Causes and Solutions The bath does not If a fault condition exists upon application of power, the bath will not energize. The turn on bath needs to be plugged in to the line voltage for at least 2 minutes before turning power on.