6102 Micro-Bath User’s Guide PN 3729224 January 2013 © 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days.
Table of Contents 1 Before You Start .......................................................................1 1.1 Symbols Used........................................................................................... 1 1.2 Safety Information .................................................................................... 2 1.2.1 1.2.2 1.3 Warnings .........................................................................................................2 Cautions ..................................
7.3.2 7.3.3 7.3.4 7.3.5 8 Access Cover (Optional) ..............................................................................19 Probe Basket ................................................................................................19 Stir Bar ..........................................................................................................20 Tank Extender (Optional) ..............................................................................20 General Operation ........................
9.4.1 9.4.2 9.4.3 9.4.4 Hold Temperature Display ............................................................................35 Mode Setting ................................................................................................35 Switch Wiring ................................................................................................36 Switch Test Example ....................................................................................36 9.5 9.6 Secondary Menu ..........................
11.3 Multiple Probe Calibration ..................................................................... 49 12 Calibration Procedure ...........................................................51 12.1 Calibration Points ................................................................................... 51 12.2 Calibration Procedure ............................................................................ 51 12.2.1 Compute DELTA ................................................................................
Tables Table 1 International Electrical Symbols ........................................................... 1 Table 2 Specifications ....................................................................................... 9 Table 3 Table of Various Bath Fluids ............................................................... 25 Table 4 Nominal Stirrer Motor Settings With Different Liquids ........................ 28 Table 5 Controller Communications Commands .............................................
Figures Figure 1 6102 Back Panel and Bottom ............................................................ 17 Figure 2 6102 Front Panel ................................................................................ 18 Figure 3 Bath Lids and Lid Parts ..................................................................... 19 Figure 4 Probe Basket ..................................................................................... 20 Figure 5 Stir Bar ...........................................................
Before You Start Symbols Used 1 Before You Start 1.1 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.
6102 Micro-Bath User’s Guide Safety Information Symbol Description C-TICK Australian EMC mark The European Waste Electrical and Electronic Equipment (WEEE) Directive (2002/96/ EC) mark. 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 household, office, and laboratory appliances. 1.
Before You Start Safety Information Overhead clearance is required. Do not place the instrument under a cabinet or other structure. Always leave enough clearance to allow for safe and easy insertion and removal of probes. The instrument is intended for indoor use only. DO NOT use the unit in environments other than those listed in the user’s guide. DO NOT carry the unit without the transport lid in place and properly secured.
6102 Micro-Bath User’s Guide Safety Information BATH FLUIDS Fluids used in this unit 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 unit is equipped with a soft cutout (user settable firmware) and a hard cutout. Check the flash point, boiling point, or other fluid characteristic applicable to the circumstances of the unit operation.
Before You Start Authorized Service Centers If a mains supply power fluctuation occurs, immediately turn off the instrument. Power bumps from brown-outs and black-outs could damage the instrument. Wait until the power has stabilized before re-energizing the instrument. Components and heater lifetime can be shortened by continuous high temperature operation. DO NOT operate the instrument without fluid. The input voltage and heater voltage switch settings must always be set to the same value. 1.
6102 Micro-Bath User’s Guide Authorized Service Centers Fluke Int’l Corporation Service Center - Instrimpex Room 2301 Sciteck Tower 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: +65-6799-5589 E-mail: anthony.ng@fluke.
Introduction 2 Introduction The Hart Scientific 6102 Micro-Bath may be used as a portable instrument or bench top temperature calibrator for calibrating thermocouple and RTD temperature probes. The 6102 is small enough to use in the field, and accurate enough to use in the lab. Calibrations may be done over a range of 35°C to 200°C (95°F to 392°F). The resolution of the 6102 temperature display is 0.01 degrees.
Specifications and Environmental Conditions Specifications 3 Specifications and Environmental Conditions 3.1 Specifications The 6102 may not meet the specification published if a different fluid is used other than distilled water or Dow Corning (200.10, 200.20) oil. Do not exceed the boiling point or flash point temperatures of the fluid. To ensure that the boiling and flash point temperatures are not exceeded adjust the High Limit and Cutout parameters.
Quick Start Unpacking 4 Quick Start Caution: READ SECTION 6 ENTITLED BATH USE before placing the bath in service. Incorrect handling can damage the bath and void the warranty. 4.1 Unpacking Unpack the Micro-Bath carefully and inspect it for any damage that may have occurred during shipment. If there is shipping damage, notify the carrier immediately. Verify that the following components are present: L L L L L L L L L L L L 4.
6102 Micro-Bath User’s Guide Power Turn on the power to the calibrator by toggling the switch on the power entry module. The fan should begin blowing air through the instrument and the controller display should illuminate after 3 seconds. After a brief self test the controller should begin normal operation. If the unit fails to operate please check the power connection.
Installation Bath Environment 5 Installation Caution: READ SECTION 6 ENTITLED BATH USE before placing the bath in service. Incorrect handling can damage the bath and void the warranty. 5.1 Bath Environment The 6102 Micro Bath is a precision instrument which should be located in an appropriate environment. The location should be free of drafts, extreme temperatures and temperature changes, dirt, etc. The surface where the bath is placed must be level.
6102 Micro-Bath User’s Guide Power 5.4 Power With the bath power switch off, plug the bath into an AC mains outlet of the appropriate voltage, frequency, and current capacity. Refer to Section 3.1, Specifications, for power details.
Bath Use General 6 Bath Use Caution: Read this section before placing the bath in service. The information in this section is for general information only. It is not designed to be the basis for calibration laboratory procedures. Each laboratory will need to write their own specific procedures. 6.1 General Be sure to select the correct fluid for the temperature range of the calibration. Bath fluids should be selected to operate safely with adequate thermal properties to meet the application requirements.
6102 Micro-Bath User’s Guide Calibration of Multiple Probes 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 Scientific, 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. Do not submerge the probe handles.
Parts and Controls Back and Bottom Panel 7 Parts and Controls The user should become familiar with the bath and its parts: Back and Bottom Panel Refer to Figure 1 on this page. Power Cord – Underneath the calibrator is the removable power cord inlet that plugs into an IEC grounded socket. Power Switch – The power switch is located on the power entry module (PEM). The PEM also houses the fuses and the dual voltage selector.
6102 Micro-Bath User’s Guide Front Panel Fan – The fan inside the calibrator runs continuously when the unit is being operated to provide cooling for the instrument. Slots at the top and around the two corners of the calibrator are provided for airÀow. The area around the calibrator must be kept clear to allow adequate ventilation. The airÀow is directed out the back. 7.2 Front Panel Refer to Figure 2 on this page.
Parts and Controls Accessories 7.3 7.3.1 Accessories Transport/Pour Lid A transport/pour lid (Figure 3) is provided so the fluid being used does not have to be removed when transporting. The lid doubles as a pour spout. Pour Spout Pour Spout Cover Transport Plug Transport/Pour Lid Aluminum Access Cover (optional) Guide Ring Figure 3 Bath Lids and Lid Parts 7.3.2 Access Cover (Optional) An aluminum access cover (Figure 3) may be purchased for optimum stability.
6102 Micro-Bath User’s Guide Accessories Figure 4 Probe Basket 7.3.4 Stir Bar The stir bar (Figure 5) sits in the bottom of the well for mixing the fluid providing better accuracy, uniformity, and stability. Figure 5 Stir Bar 7.3.5 Tank Extender (Optional) An optional tank extender is available for increasing the depth of the tank. The stability and the uniformity of the bath may change when using the extender. The extender screws onto the tank and is equipped with an O-ring.
General Operation Switching to 230V Operation 8 General Operation 8.1 Switching to 230V Operation The 6102 is switchable from 115 VAC to 230 VAC 50/60 Hz. Swithcing the voltage can change the calibration, so the unit should be calibrated after changing the input voltage. To change from 115 VAC to 230 VAC: 1. Unplug the unit. 2. Lay the unit down on its side. 3. With a small straight slot screwdriver remove the fuse holder located on the bottom of the bath. Replace the two fuses (3 amp 250 V) with 1.
6102 Micro-Bath User’s Guide Bath Fluid 8.2.2 Viscosity Viscosity is a measure of the thickness of a fluid, how easily it can be poured and mixed. Viscosity affects the temperature stability of the bath. With low viscosity, fluid mixing is better which creates a more uniform temperature throughout the bath. This improves the bath response time which allows it to maintain a more constant temperature. For good control the viscosity should be less than ten centistokes.
General Operation Bath Fluid 8.2.7 Fluid Lifetime Many fluids degrade over time because of evaporation, water absorption, gelling, or chemical breakdown. Often the degradation becomes significant near the upper temperature limit of the fluid, substantially reducing the fluid’s lifetime. 8.2.8 Safety When choosing a fluid always consider the safety issues associated. Obviously where there are conditions of extreme hot or cold there can be danger to people and equipment.
6102 Micro-Bath User’s Guide Bath Fluid 8.2.10.1 Water (Distilled) Water is often used because of its very low cost, availability, and excellent temperature control characteristics. Water has very low viscosity and good thermal conductivity and heat capacity which makes it among the best fluids for control stability at low temperatures. Temperature stability is much poorer at higher temperatures because water condenses on the lid, cools and drips into the bath. Water is safe and relatively inert.
General Operation Bath Fluid 8.2.11.1 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. Specifications may change and sources sometimes offer differing information.
6102 Micro-Bath User’s Guide Bath Fluid Figure 6 Chart of Various Bath Fluids 8.2.11.2 About the Graph The fluid graph visually illustrates some of the important qualities of the fluids shown. Temperature Range: The temperature scale is shown in degrees Celsius. The fluids’ general range of application is indicated by the shaded bands. Qualities including pour point, freeze point, important viscosity points, flash point, boiling point and others may be shown.
General Operation Stirring 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. Pour Point: This represents a handling limit for the fluid. Viscosity: Points shown are at 50 and 10 centistokes viscosity. When viscosity is greater than 50 centistokes stirring is very poor and the fluid is unsatisfactory for bath applications. Optimum stirring generally occurs at 10 centistokes and below.
6102 Micro-Bath User’s Guide Power Table 4 Nominal Stirrer Motor Settings With Different Liquids 8.4 Liquid Boiling/Flash Point Stir Motor Setting Temperature Distilled Water/ Ethylene Glycol 100°C 15 25°C to 80°C (77°F to 176°F) 200.10 Oil 165°C 25 80°C to 140°C (176°F to 284°F) 200.20 Oil 133°C 20 130°C to 200°C (266°F to 392°F) Power Power to the bath is provided by an AC mains supply and passes through a filter to prevent switching spikes from being transmitted to other equipment.
General Operation Temperature Controller The bath is operable within the temperature range given in the specifications. For protection against solid-state relay failure or other circuit failure, a bi-metallic cutout automatically turns off the heater anytime the bath temperature exceeds the maximum temperature.
Controller Operation Well Temperature 9 Controller Operation This chapter discusses in detail how to operate the bath temperature controller using the front control panel. Using the front panel key-switches and LED display the user may monitor the well temperature, set the temperature set-point in degrees C or F, monitor the heater output power, adjust the controller proportional band, and program the calibration parameters, operating parameters, and serial interface configuration.
6102 Micro-Bath User’s Guide Temperature Set-point UP Display Temperature Switch Hold Display Mode DOWN SET SET Select Setpoint + DOWN Toggles Display of Rs Adjust Setpoint SET EXIT + UP Toggles °C / °F Units °C/°F Secondary Functions Scan On/Off SET + EXIT EXIT EXIT Cal Menu Display Power Scan Rate R0 Cut-out Adj. R0 Configuration Menu ALPHA SET Adj. ALPHA Menu Legend: Press “SET” to step through the menu and to store the parameter value.
Controller Operation Temperature Set-point 100.00C Well temperature in degrees Celsius 2 Access set-point memory 1. 25 Set-point memory 1, 25°C currently used To change the set-point memory press “UP” or “DOWN”. 4. 125. New set-point memory 4, 125°C Press “SET” to accept the new selection and access the set-point value. 2 Accept selected set-point memory 9.2.2 Set-point Value The set-point value may be adjusted after selecting the set-point memory and pressing “SET”. 4 125.
6102 Micro-Bath User’s Guide Scan Un= F 9.3 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. With the scan disabled the bath heats or cools at the maximum possible rate. 9.3.1 Scan Control The scan is controlled with the scan on/off function that appears in the main menu after the set-point function.
Controller Operation Temperature Display Hold 9.4 Temperature Display Hold The 6102 has a display hold function which allows action of an external switch to freeze the displayed temperature and stop the set-point from scanning. This is useful for testing thermal switches and cutouts. This section explains the functions available for operating the temperature hold feature. An example follows showing how to set up and use the hold feature to test a switch. 9.4.
6102 Micro-Bath User’s Guide Secondary Menu 9.4.3 Switch Wiring The thermal switch or cutout is wired to the calibrator at the two terminals on the back of the Micro-Bath labeled “DISPLAY HOLD”. The switch wires may be connected to the terminals either way. Internally the black terminal connects to ground. The red terminal connects to +5V through a 100 k: resistor. The calibrator measures the voltage at the red terminal and interprets +5V as open and 0V as closed. 9.4.
Controller Operation Heater Power 9.6 Heater Power The temperature controller controls the temperature of the well 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. By knowing the amount of heating the user can tell if the calibrator is heating up to the set-point, cooling down, or controlling at a constant temperature.
6102 Micro-Bath User’s Guide Cutout The proportional band width is set at the factory to about 5.0°C. The proportional band width may be altered by the user if he desires to optimize the control characteristics for a particular application. The proportional band width is easily adjusted from the front panel. The width may be set to discrete values in degrees C or F depending on the selected units. The proportional band adjustment is be accessed within the secondary menu.
Controller Operation Controller Configuration again. If the mode is set to manual, the heater remains disabled until the user manually resets the cutout. The cutout set-point may be accessed within the secondary menu. Press “SET” and “EXIT” simultaneously to enter the secondary menu. The heater power is displayed. Press “SET” twice to access the cutout set-points. cutout 225 Flashes “cutout” and then the setting Cutout setting To change the cutout setting press “UP” or “DOWN”.
6102 Micro-Bath User’s Guide Operating Parameters 16 New Stir Speed setting Press “SET” to accept the new Stir Speed. The stir motor speed needs to be varied for best stability. Table 4 on page 28 shows nominal settings for several fluids. 9.10.2 High Limit The High Limit Parameter adjusts the upper set-point temperature. The factory default and maximum temperature are set to 200°C. For safety, a user can adjust the High Limit down so the maximum temperature set-point is restricted.
Controller Operation Serial Interface Parameters To store the new setting, press “SET”. Press “EXIT” to continue without storing the new value. 9.11 Serial Interface Parameters The serial RS-232 interface parameters menu is indicated by, SErIAL Serial RS-232 interface parameters menu The serial interface parameters menu contains parameters which determine the operation of the serial interface. These controls only apply to instruments fitted with the serial interface.
6102 Micro-Bath User’s Guide Serial Interface Parameters Adjust the value with “UP” or “DOWN” and then use “SET” to store the sample rate to the displayed value. “EXIT” does not store the new value. SP= 60 9.11.3 New sample period Duplex Mode The next parameter is the duplex mode. The duplex mode may be set to full duplex or half duplex. With full duplex any commands received by the calibrator via the serial interface are immediately echoed or transmitted back to the device of origin.
Controller Operation Calibration Parameters 9.12 Calibration Parameters The operator of the Micro-Bath controller has access to a number of the bath calibration constants namely R0, ALPHA, DELTA, C0, CG, and rCAL. These values are set at the factory and must not be altered. The correct values are important to the accuracy and proper and safe operation of the bath.
6102 Micro-Bath User’s Guide Calibration Parameters 44 9.12.4 C0 and CG These parameters calibrate the accuracy of the bath set-point. These are programmed at the factory when the bath is calibrated. DO NOT alter the value of these parameters. If the user desires to calibrate the bath for improved accuracy then calibrate R0, ALPHA, and DELTA according to the procedure in Section 12. 9.12.5 rCAL DO NOT adjust this parameter. It is for factory use only.
Digital Communication Interface Serial Communications 10 Digital Communication Interface The Micro-Bath calibrator is capable of communicating with and being controlled by other equipment through the digital serial interface. With a digital interface the instrument may be connected to a computer or other equipment. This allows the user to set the set-point temperature, monitor the temperature, and access any of the other controller functions, all using remote communications equipment.
6102 Micro-Bath User’s Guide Serial Communications interface parameters menu are the BAUD rate, the sample rate, the duplex mode, and the linefeed parameter. 10.1.2.1 Baud Rate The baud rate is the first parameter in the menu. The display will prompt with the baud rate parameter by showing “bAUd”. Press “SET” to choose to set the baud rate. The current baud rate value will then be displayed. The baud rate of the 6102 serial communications may be programmed to 300, 600, 1200, 2400, 4800, or 9600 baud.
Digital Communication Interface Interface Commands 10.2 Interface Commands The various commands for accessing the calibrator functions via the digital interfaces are listed in this section (see Table 5). These commands are used with the RS-232 serial interface. 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.
6102 Micro-Bath User’s Guide Interface Commands Table 5 Controller Communications Commands Command Description Display Temperature Read current set-point Set current set-point to n Read temperature Read temperature units Set temperature units: Set temperature units to Celsius Set temperature units to Fahrenheit Read scan mode Set scan mode Read scan rate Set scan rate Read hold Secondary Menu Read proportional band setting Set proportional band to n Read heater power (duty cycle) Configuration Menu Operatin
Test Probe Calibration Calibrating a Single Probe 11 Test Probe Calibration Note: This procedure is to be considered a general guideline. Each laboratory should write their own procedure based on their equipment and their quality program. Each procedure should be accompanied by an uncertainty analysis also based on the laboratory’s equipment and environment.
Calibration Procedure Calibration Points 12 Calibration Procedure Note: This procedure is to be considered a general guideline. Each laboratory should write their own procedure based on their equipment and their quality program. Each procedure should be accompanied by an uncertainty analysis also based on the laboratory’s equipment and environment. Sometimes the user may want to calibrate the bath to improve the temperature set-point accuracy.
6102 Micro-Bath User’s Guide Calibration Procedure 12.2.1 Compute DELTA A T3 T2 B T2 T1 T3 ¶ § T2 ¶ § T2 ¶ § T ¶§ 1 C ¨ 3 · ¨1 · ¨ · ¨ · © 100 ¸ © 100 ¸ © 100 ¸ © 100 ¸ T2 ¶ § T1 ¶ § T1 ¶ § T ¶§ 1 D ¨ 2 · ¨1 · ¨ · ¨ · © 100 ¸ © 100 ¸ © 100 ¸ © 100 ¸ E R3 T2 F R2 T1 delta AF BE DE CF T1-3 – Measured temperature using thermometer. R1-3 – Value of R from display of 6102 (Press SET and DOWN at the same time.) where T1 and R1 are the measured temperature and resistance at 50.
Calibration Procedure Calibration Procedure “R0” is displayed. 2. Press “SET” then use the “UP” or “DOWN” keys until the correct numerical setting is displayed. Press “SET” to accept the new value. 3. Repeat step 2 for ALPHA and DELTA. 12.2.3 Accuracy & Repeatability Check the accuracy of the Micro-Bath at various points over the calibrated range. If Micro-Bath does not pass specification at all set-points, repeat the Calibration Procedure.
Maintenance 13 Maintenance L L L L L L L L 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 an oily, wet, dirty, or dusty environment. If the outside of the instrument becomes soiled, it may be wiped clean with a damp cloth and mild detergent.
Troubleshooting Troubleshooting Problems, Possible Causes, and Solutions 14 Troubleshooting This section contains information on troubleshooting and CE Comments. 14.1 Troubleshooting Problems, Possible Causes, and Solutions 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.
6102 Micro-Bath User’s Guide CE Comments Problem Possible Causes and Solutions AC voltage present on Use a wall plug tester to check the main power plug at the wall. Use an ohmmeter to the chassis check the continuity between the ground prong on the PEM and the chassis. If the resistance reading is greater than three ohms, there is a problem. Check the power cord for continuity on the ground prongs. If the resistance is greater than one ohm, replace the power cord.
