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Fluke 6055 User Manual

Fluke 6055 User Manual

Calibration bath
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Via Acquanera, 29
22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
info@calpower.it
www.calpower.it
October 2013
© 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
6055
Calibration Bath
User's Guide

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Summary of Contents for Fluke 6055

  • Page 1 Via Acquanera, 29 22100 Como tel. 031.526.566 (r.a.) fax 031.507.984 info@calpower.it www.calpower.it 6055 Calibration Bath User’s Guide October 2013 © 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.

  • Page 3: Table Of Contents

    Table of Contents 1 Before you start ......1 Symbols used ......1 Safety information .
  • Page 4 Bath fluid ......25 Fluid system ......25 Fluid Drain .
  • Page 5 9 Digital communication interface ....45 Serial communications ..... . . 45 9.1.1 Wiring .
  • Page 6 Figures and Tables Figure 1 Controller panel ......19 Figure 2 Power panel ....... 20 Figure 3 Back panel .

  • 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

    Examples include household, office, and laboratory appliances. C-TIC Australian EMC Mark Safety information DISCLAIMER: Fluke Corporation, Hart Scientific Division manufac- tures baths for the purpose of temperature calibration. Baths used for ap- plications other than calibration are used at the discretion and sole responsibility of the customer.
  • Page 9 1 Before you start Safety information DO NOT use the instrument for any application other than calibration work. The instrument was designed for temperature calibration. Any other use of the unit may cause unknown hazards to the user. DO NOT use the unit in environments other than those listed in the user’s guide.
  • Page 10 6055 Calibration Bath User’s Guide the individual MSDS sheets for the three components that make up the salt. The bath is provided with an access cover. The cover should remain on the bath whenever possible. Operating the bath without the access cover reduces stability, increases out gassing of fluids, and increases the possi- bility of personal injury or fire hazard.

  • Page 11: Cautions

    1 Before you start Safety information BATH SALT Salt 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 (set at the factory).

  • Page 12: Authorized Service Centers

    6055 Calibration Bath User’s Guide triple point of water checks. Never immerse a wet or cold PRT into a bath filled with hot fluid. Severe damage to the PRT may result as well as per- sonal injury to the calibration technician.
  • Page 13 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 14: Introduction

    2 Introduction Introduction The 6055 Calibration Bath is a highly stable constant temperature salt bath. It has been designed for calibrating liquid-in-glass thermometers or other types of long thermometers against a known temperature standard such as a Standard Platinum Resistance Thermometer (SPRT).

  • Page 15: Specifications And Environmental Conditions

    3 Specifications and environmental conditions Specifications Specifications and environmental conditions Specifications 200 °C to 550 °C (392 °F to 1022 °F) Range ± 0.003 °C at 200 °C (salt) Stability ± 0.010 °C at 550 °C (salt) ± 0.005 °C at 200 °C (salt) Uniformity ±...
  • Page 16 6055 Calibration Bath User’s Guide mains voltage within ±10% of nominal vibrations in the calibration environment should be minimized altitude less than 2000 meters...

  • Page 17: Installation

    Incorrect handling can damage the bath and void the war- ranty. This section provides the steps required to set up and operate the 6055 bath. This section should be used as a general overview and reference and not as a substitute for the remainder of the manual.

  • Page 18: Comments Concerning The Use Of Salt

    Do not turn the POWER on until the tank is 3/4 full of melted salt. Bath environment The Model 6055 bath is a precision instrument that must be located in an ap- propriate environment. The location should be free from drafts, extreme tem- peratures, extreme temperature changes, and dirt.

  • Page 19: Setting The Temperature

    4 Installation Setting the temperature Setting the temperature In the following discussion and throughout this manual a solid box around the word SET, UP, EXIT, or DOWN indicates the panel button while the dotted box indicates the display reading. Explanation of the button or display reading are to the right of each button or display value.
  • Page 20 6055 Calibration Bath User’s Guide The bath heats or cools until it reaches the new set-point temperature. Set the heater switch to position “HIGH” to allow the bath to more quickly reach a higher temperature. The “HIGH” setting may be necessary to reach higher tem- peratures and control at high temperatures.

  • Page 21: Bath Use

    5 Bath Use General Bath Use CAUTION: READ THIS SECTION before placing the bath in service. Incorrect handling can damage the bath and void the warranty. The information in this section is for general information only. It is not de- signed to be the basis for calibration laboratory procedures.

  • Page 22: Calibration Of Multiple Probes

    6055 Calibration Bath User’s Guide the same time. However, stem effect from different types of probes is not to- 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.
  • Page 24 6055 Calibration Bath User’s Guide Power panel The Power Panel (Figure 2) controls include: 1) the power switch and indicator, 2) the boost heater and indicator, 3) the mode select switch and indicators, 4) the control heating select switch, and 5) the drift adjust control.

  • Page 25: Parts And Controls

    6 Parts and controls Power panel Figure 3 Back panel...

  • Page 26: Back Panel

    6055 Calibration Bath User’s Guide tions depending on bath temperature. The switch simply adds more heat- ers into the circuit until the desired power is attained. Position 2 is variable using the Drift Adjust control. 5) The drift adjust control is a variable transformer that adjusts the position 1 control heater through 0 to 100% of its power range.

  • Page 27: General Operation

    The components, features and operational theory of the Model 6055 calibration bath are described in this section. The Model 6055 calibration bath is shown in block diagram form in Figure 4 on page 24. This diagram illustrates the primary features of the bath system and their function, which are described as follows.

  • Page 28: Figure 4 System Diagram

    6055 Calibration Bath User’s Guide Figure 4 System diagram...

  • Page 29: Bath Fluid

    7 General operation Bath fluid Bath fluid Heat transfer salt works with the 6055 bath up to 550°C. Other fluids SHOULD NOT be used with the 6055 bath. Fluid system The fluid system consists of the insulated tank, the stirrer assembly, the drain, the overflow test well, and the fluid.

  • Page 30: Figure 5 System Diagram

    6055 Calibration Bath User’s Guide Figure 5 System diagram...

  • Page 31: Melting The Salt

    7 General operation Filling the bath Use an immersion heater (with a power of about 1000 watts) to melt the salt. Do not use the control heaters to melt the granular salt or they will be damaged. Inspect the drain to be sure it is fully sealed. Insert the immersion heater into the test well and fill the remaining space with the granular salt.

  • Page 32: Stirring

    6055 Calibration Bath User’s Guide Stirring Stirring of the bath salt is very important for stable temperature control. The salt must be mixed well for good temperature uniformity and fast controller re- sponse. The stirrer is precisely adjusted for optimum performance.

  • Page 33: Controller Operation

    8 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, optional serial and IEEE-488 interface...

  • Page 34: Figure 6 Controller Operation Flowchart

    6055 Calibration Bath User’s Guide Display Secondary Functions Temperature EXIT Display Power EXIT EXIT Reset Cutout Cutout Active EXIT Set Proportional Band Select Setpoint EXIT EXIT Set Cutout Temp. EXIT Adjust Setpoint EXIT Adjust Vernier EXIT Set Scale °C/°F EXIT...

  • Page 35: Temperature Set-Point

    8 Controller operation Temperature set-point Cut-out reset function rESEt ? Press “SET” once more to reset the cut-out. Reset cut-out This will also switch the display to the set temperature function. To return to displaying the temperature press the “EXIT” button. If the cut-out is still in the over-temperature fault condition the display continues to flash “cut-out”.

  • Page 36: Set-Point Value

    6055 Calibration Bath User’s Guide Accept selected set-point memory 8.3.2 Set-point value The set-point value may be adjusted after selecting the set-point memory and pressing “SET”. The set-point value is displayed with the units, C or F, at the left.

  • Page 37: Temperature Scale Units

    8 Controller operation Temperature scale units Next press “EXIT” to return to the temperature display or “SET” to access the temperature scale units selection. Access scale units Temperature scale units The temperature scale units of the controller may be set by the user to degrees Celsius (°C) or Fahrenheit (°F).

  • Page 38: Secondary Menu

    6055 Calibration Bath User’s Guide 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 39: Figure 7 Bath Temperature Fluctuations At Various Proportional Band Settings

    8 Controller operation Proportional band tional band is too narrow the bath temperature may swing back and forth be- cause the controller overreacts to temperature variations. For best control stability the proportional band must be set for the optimum width. The optimum proportional band width depends on several factors among which are fluid volume, fluid characteristics (viscosity, specific heat, thermal conduc- tivity), operating temperature, and stirring.

  • Page 40: Cut-Out

    6055 Calibration Bath User’s Guide Proportional band setting Pb=0.101C To change the proportional band press “UP” or “DOWN”. Decrement display New proportional band setting Pb=0.060C To accept the new setting and access the cut-out set-point press “SET”. Press- ing “EXIT” will exit the secondary menu ignoring any changes just made to the proportional band value.

  • Page 41: Controller Configuration

    8 Controller operation Controller configuration Proportional band setting Pb=0.101C Access cut-out set-point Cut-out set-point CO= 210C To change the cut-out set-point press “UP” or “DOWN”. Decrement display New cut-out set-point CO= 95C To accept the new cut-out set-point press “SET”. Accept cut-out set-point The next function is the configuration menu.

  • Page 42: Alpha

    6055 Calibration Bath User’s Guide 8.10.1 This probe parameter refers to the resistance of the control probe at 0°C. Nor- mally this is set for 100.000 ohms. 8.10.2 ALPHA This probe parameter refers to the average sensitivity of the probe between 0 and 100°C.

  • Page 43: Stir Set-Point

    8 Controller operation Operating parameters Stirrer mode selection parameter Str Act Press “SET” to access the parameter setting. Stirrer is set for automatic activation at the stirrer set-point Str=Auto temperature. To change the setting to always on press the “UP” or “DOWN” buttons and then “SET”.

  • Page 44: Serial Interface Parameters

    6055 Calibration Bath User’s Guide HU=LO Low power heat up mode for heat transfer salt HU=HI High power heat up mode Press “UP” or “DOWN” to change the option and then press “SET” to store the setting. NOTE: When using salt as the fluid be sure to always set this option to LO to maximize the lifetime of the heaters.

  • Page 45: Sample Period

    8 Controller operation Serial interface parameters 8.12.2 Sample period The sample period is the next parameter in the serial interface parameter menu. The sample period is the time period in seconds between temperature measure- ments transmitted from the serial interface. If the sample rate is set to 5, for in- stance, the bath transmits the current measurement over the serial interface approximately every five seconds.

  • Page 46: Ieee-488 Parameters

    6055 Calibration Bath User’s Guide Press “SET” to access the linefeed parameter. Current linefeed setting LF= On The mode may be changed using “UP” or “DOWN” and pressing “SET”. New linefeed setting LF= OFF 8.13 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.

  • Page 47: Cto

    8.14.1 Parameter CTO sets the calibration of the over-temperature cut-out. This is not adjustable by software but is adjusted with an internal potentiometer. For the 6055 bath this parameter should read between 560 and 570. 8.14.2 CO and CG These parameters calibrate the accuracy of the bath set-point. These are pro- grammed at the factory when the bath is calibrated.

  • Page 48: Digital Communication Interface

    Serial communications Digital communication interface If supplied with the option, the 6055 bath is capable of communicating with and being controlled by other equipment through the digital interface. Two types of digital interface are available — the RS-232 serial interface and the IEEE-488 GPIB interface.

  • Page 49: Baud Rate

    6055 Calibration Bath User’s Guide repeatedly until the serial interface menu is indicated with “SErIAL”. Finally press “SET” to enter the serial interface parameters menu. In the serial interface parameters menu are the baud rate, sample rate, duplex mode, and linefeed parameters.

  • Page 50: Ieee-488 Communication (Optional)

    9 Digital communication interface IEEE-488 communication (optional) face commands are discussed in Section 9.3. All commands are ASCII charac- ter strings terminated with a carriage-return character (CR, ASCII 13). IEEE-488 communication (optional) The IEEE-488 interface is available as an option. Baths supplied with this op- tion may be connected to a GPIB type communication bus which allows many instruments to be connected and controlled simultaneously.
  • Page 51 6055 Calibration Bath User’s Guide Table 1 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 52 9 Digital communication interface Interface commands Interface command summary cont. Command Command Returned Acceptable Command Description Format Example Returned Example Values Set cut-out to be reset cm[ode]=a[uto] cm=a automatically Read Stirrer Mode smod smod smod: {xxxx} smod: AUTO ON or AUTO Set Stirrer Mode: smod=o/a Set stirrer activation...
  • Page 53 6055 Calibration Bath User’s Guide Interface command summary cont. Command Command Returned Acceptable Command Description Format Example Returned Example Values Set heater 1 to on f1= n f1=1 Set heater 1 to off f1= n f1=0 Read Heater 2 f2:9...

  • Page 54: Power Commands

    “OFF”. Otherwise, the interface would not be able to switch these functions off. The 6055 bath has five control functions with the digital in- terface. These are controls for heaters 1, 2, 3, and 4, each 225 W, and the boost heater which is 900 W.

  • Page 55: Heater Settings For Control

    6055 Calibration Bath User’s Guide levels. Power is variable with the front panel DRIFT control when heater 1 (F1) is turned on. Table 2 Power Commands POWER 0–225 W LOW 225–450 W MEDIUM 450–675 W MEDIUM HIGH 675–900 W HIGH...

  • Page 56: Calibration Procedure

    10 Calibration procedure Calibration points Calibration procedure In some instances the user may want to calibrate the bath to improve the tem- perature set-point accuracy. Calibration is done by adjusting the controller probe calibration constants R0 and ALPHA so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set-point.

  • Page 57: Calibration Example

    6055 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 R0 and ALPHA are computed by entering...

  • Page 58: Figure 9 Calibration Example

    10 Calibration procedure Calibration example = 100.000 ALPHA = 0.0038500 = 80.00°C measured t = 79.843°C = 120.00°C measured t = 119.914°C Compute errors, = 79.843 - 80.00°C = -0.157°C = 119.914 - 120.00°C = -0.086°C Compute R 0 086 80 0 0157 120 0...

  • Page 59: Maintenance

    11 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 60 6055 Calibration Bath User’s Guide Before using any cleaning or decontamination method except those rec- ommended by Hart, users should check with an Authorized Service Cen- ter to be sure that the proposed method will not damage the equipment. 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.

  • Page 61: Troubleshooting

    12 Troubleshooting Troubleshooting Troubleshooting In the event the bath appears to function abnormally this section may help to find and solve the problem. Several possible problem conditions are described along with likely causes and solutions. If a problem arises please read this sec- tion carefully and attempt to understand and solve the problem.
  • Page 62 6055 Calibration Bath User’s Guide Problem Causes and Solutions The display flashes Low battery. A problem could exist with the memory back-up battery. If the bat- “CUToUT” alternately tery voltage is insufficient to maintain the memory, data may become scrambled with an incorrect process causing problems.

  • Page 63: Comments

    12 Troubleshooting Comments Problem Causes and Solutions Stir motor does not Improper setting or normal operation. See Section 8.11.2, Stir Mode Select, for function proper stir mode settings. Note: Stir Mode Select defaults to “Auto” each time the power of the bath is cycled off and back on.

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