7103 Micro-Bath User’s Guide PN 3729337 December 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 1.2 Symbols Used........................................................................................... 1 Safety Information .................................................................................... 2 1.2.1 1.2.2 1.3 Warnings ...................................................................................................2 Cautions ..........................................
7.3.2 7.3.3 7.3.4 8 Access Cover ...............................................................................................19 Probe Basket ................................................................................................20 Stir Bar ..........................................................................................................20 General Operation ..................................................................21 8.1 8.2 Changing Display Units .............................
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 ..........................
12.2 Calibration Procedure ............................................................................ 49 12.2.1 12.2.2 12.2.3 12.2.4 Compute DELTA ...........................................................................................49 Compute R0 & ALPHA ..................................................................................50 Compute BETA ..............................................................................................50 Accuracy & Repeatability .............................
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 ........................ 27 Table 5 Controller Communications Commands .............................................
Figures Figure 1 7103 Back Panel and Bottom ............................................................ 17 Figure 2 7103 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.
7103 Micro-Bath User’s Guide Safety Information Symbol Description 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. C-TICK Australian EMC mark The European Waste Electrical and Electronic Equipment (WEEE) Directive (2002/96/ EC) mark. 1.
Before You Start Safety Information Calibration Equipment should only be used by Trained Personnel. If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired or safety hazards may arise. Inspect the instrument for damage before each use. DO NOT use the instrument if it appears damaged or operates abnormally.
7103 Micro-Bath User’s Guide Safety Information ELECTRICAL HAZARD These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly. This instrument must be plugged into a 115 VAC (± 10%) or 230 VAC (± 10%) 50/60 Hz only electric outlet as indicated on the back panel. The power cord of the instrument is equipped with a three-pronged grounding plug for your protection against electrical shock hazards.
Before You Start Authorized Service Centers The unit is a precision instrument. Although it has been designed for optimum durability and trouble free operation, it must be handled with care. Most probes have handle temperature limits. Be sure that the probe handle temperature limit is not exceeded in the air above the instrument. The instrument and any thermometer probes used with it are sensitive instruments that can be easily damaged. Always handle these devices with care.
7103 Micro-Bath User’s Guide Authorized Service Centers 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 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.
Introduction 2 Introduction The Hart Scientific 7103 Micro-Bath may be used as a portable instrument or bench top temperature calibrator for calibrating thermocouple and RTD temperature probes. The 7103 is small enough to use in the field, and accurate enough to use in the lab. With an ambient temperature of 23°C (74°F), calibrations may be done over a range of -30°C to 125°C (-22°F to 257°F). The resolution of the 7103 temperature display is 0.01 degrees.
Specifications and Environmental Conditions Specifications 3 Specifications and Environmental Conditions 3.1 Specifications Table 2 Specifications 3.2 Range -30 to 125°C (-22 to 257°F) Accuracy ±0.25°C Stability ±0.03°C at -25°C (oil, 5010) ±0.05°C at 125°C (oil, 5010) Uniformity ±0.02°C Resolution 0.01°C/F Operating Temperature 5 to 45°C (41 to 113°F) Heating Time 25°C to 100°C: 35 minutes Cooling Time 25°C to –25°C: 45 minutes Well Size 2.5" dia. x 5.
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 4.
7103 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 7103 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.
7103 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 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.
7103 Micro-Bath User’s Guide Calibration of Multiple Probes to reduce the stem effect to a minimum: 15 x the diameter of the UUT + the sensor length. Do not submerge the probe handles. If the probe handles get too warm during calibration at high temperatures, a heat shield could be used just below the probe handle. This heat shield could be as simple as aluminum foil slid over the probe before inserting it in the bath or as complicated as a specially designed reflective metal apparatus.
7103 Micro-Bath User’s Guide Front Panel adequate ventilation. The airflow is directed up through the top ventilation slots and out the back and sides of the unit. Display Hold Terminals – The 7103 has a display hold function which allows action of an external switch to freeze the displayed temperature and stop the set-point from scanning. 7.2 Front Panel Figure 2 on page 18.
Parts and Controls Accessories 7.3 7.3.1 Accessories Transport/Pour Access Lid A transport/pour access 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 Access Cover Transport/Pour Access Lid Guide Ring Figure 3 Bath Lids and Lid Parts 7.3.2 Access Cover An access cover is available for optimum stability.
7103 Micro-Bath User’s Guide Accessories 7.3.3 Probe Basket A probe basket (Figure 4) is provided as a guide for the probes and to prevent bumping of the stir bar. Fill Level 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.
General Operation Changing Display Units 8 General Operation 8.1 Changing Display Units The 7103 can display temperature in Celsius or Fahrenheit. The temperature units are shipped from the factory set to Celsius. To change to Fahrenheit or back to Celsius there are two ways: 1. Press “SET” and “UP” simultaneously. The display units are changed. or 1. Press the “SET” key three times from the temperature display to show Un = C 2. Press the “UP” or “DOWN” key to change units. 3.
7103 Micro-Bath User’s Guide Bath Fluid 8.3.2 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 8.3.7 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. 8.3.8 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.
7103 Micro-Bath User’s Guide Bath Fluid 8.3.10.1 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 8.3.11.1 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.
7103 Micro-Bath User’s Guide Bath Fluid Figure 6 Chart of Various Bath Fluids 8.3.11.2 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 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. Fume Point: A fume hood should be used.
7103 Micro-Bath User’s Guide Power 8.5 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. Refer to Section 3.1, Specifications, for power details. To turn on the bath, switch the control panel power switch to the ON position.
General Operation Temperature Controller When the controller is set to a new set-point the bath heats or cools to the new temperature. Once the new temperature is reached the bath usually takes 15 – 20 minutes for the temperature to settle and stabilize. There may be a small overshoot or undershoot.
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.
7103 Micro-Bath User’s Guide Temperature Set-point Figure 7 Controller Operation Flowchart 32
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.
7103 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 7103 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 cut-outs. The instrument must be powered off before attaching thermal switches or cut-outs. This section explains the functions available for operating the temperature hold feature.
7103 Micro-Bath User’s Guide Secondary Menu 9.4.3 Switch Wiring The thermal switch or cut-out 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 Proportional Band controlling at a constant temperature. Monitoring the percent heater power will let the user know how stable the well temperature is. With good control stability the percent heating power should not fluctuate more than ±5% within one minute. The heater power display is accessed in the secondary menu. Press “SET” and “EXIT” simultaneously and release. The heater power will be displayed as a percentage of full power. 100.
7103 Micro-Bath User’s Guide Controller Configuration 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 9.8.1.1 High Limit The High Limit Parameter adjusts the upper set-point temperature. The factory default and maximum temperature are set to 126°C. For safety, a user can adjust the HL down so the maximum temperature set-point is restricted.
7103 Micro-Bath User’s Guide Controller Configuration 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. The parameters in the menu are — BAUD rate, sample period, duplex mode, and linefeed. Press “UP” to enter the menu. 9.8.2.1 Baud Rate The baud rate is the first parameter in the menu. The baud rate setting determines the serial communications transmission rate.
Controller Operation Controller Configuration serial interface will be immediately echoed or transmitted back to the device of origin. With half duplex the commands will be executed but not echoed. The duplex mode parameter is indicated by, dUPL Flashes “dUPL” and then displays the setting d=FULL Current duplex mode setting The mode may be changed using “UP” or “DOWN” and pressing “SET”. d=HALF 9.8.2.
7103 Micro-Bath User’s Guide Controller Configuration The calibration parameters R0, ALPHA, DELTA, and BETA characterize the resistance-temperature relationship of the platinum control sensor. These parameters may be adjusted by an experienced user to improve the accuracy of the calibrator. 9.8.3.1 Hard Cutout This parameter is the temperature above which the unit shuts down automatically. The parameter is set at the factory to approximately 140°C and can be changed only through the variable resistor.
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.
7103 Micro-Bath User’s Guide Serial Communications 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 7103 serial communications may be programmed to 300, 600, 1200, 2400, 4800, or 9600 baud. The baud rate is pre-programmed to 2400 baud. Use “UP” or “DOWN” to change the baud rate value.
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.
7103 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 Command Format Command Example Returned Returned Examp
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.
7103 Micro-Bath User’s Guide Calibration Procedure T3 ¶ T4 ¶ § T3 ¶ § § T ¶§ 1 C ¨ 4 · ¨1 · ¨ · ¨ · © 100 ¸ © 100 ¸ © 100 ¸ © 100 ¸ T3 ¶ § T2 ¶ § T2 ¶ § T ¶§ 1 D ¨ 3 · ¨1 · ¨ · ¨ · © 100 ¸ © 100 ¸ © 100 ¸ © 100 ¸ E R4 T3 F R3 T2 delta AF BE DE CF T1-3 – Measured temperature using thermometer. R1-3 – Value of R from display of 7103 (Press SET and DOWN at the same time.
Calibration Procedure Calibration Procedure §T ¶ y ¨ 1 · © 100 ¸ beta 1 alpha x t y 3 x y 3 delta y2 R1 rzero alpha x y 3 Where t and r are the measured temperature and resistance at –25°C and alpha, rzero, and delta are the new values of R0, ALPHA, and DELTA calculated above. 1. Program the new values for DELTA (delta), R0 (rzero), ALPHA (alpha), and BETA (beta) into the Micro-Bath with the following steps. 2. Display R0 by pressing the “SET” and “EXIT” keys simultaneously.
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.
7103 Micro-Bath User’s Guide 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. 14.2 Comments 56 14.2.
