Fluke 7108 User Manual
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Fluke 7108 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
PN 3729343
January 2014
© 2014 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
7108
Calibration Bath
User's Guide

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  • Page 1 22100 Como tel. 031.526.566 (r.a.) fax 031.507.984 info@calpower.it www.calpower.it 7108 Calibration Bath User's Guide PN 3729343 January 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.

  • Page 3: Table Of Contents

    Table of Contents Chapter Title Page Before You Start .................. 1-1 Introduction ................1-1 Symbols Used................1-1 Safety Information ..............1-2 1.3.1 WARNINGS ................1-2 1.3.2 CAUTIONS ................1-4 Authorized Service Centers ............1-6 Specifications and Environmental Conditions ......... 2-1 Specifications................
  • Page 4 7108 User's Guide Parts and Controls ................6-1 Front Control Panel ..............6-1 6.2 Back Panel ..................6-2 General Operation ................7-1 Switching to 230 V Operation ............ 7-1 Bath Fluid................... 7-1 7.2.1 Temperature Range ............... 7-1 7.2.2 Viscosity ................. 7-2 7.2.3...
  • Page 5 Contents (continued) Digital Communication Interface ............9-1 Serial Communications .............. 9-1 9.1.1 Wiring ..................9-1 9.1.2 Setup ..................9-1 9.1.2.1 Baud rate ................9-2 9.1.2.2 Sample Period ..............9-2 9.1.2.3 Duplex Mode ..............9-2 9.1.2.4 Linefeed ................9-2 9.1.3 Serial Operation ..............9-2 IEEE-488 Communication ............
  • Page 6 7108 User's Guide...
  • Page 7 List of Tables Table Title Page International Electrical Symbols ..............1-1 Specifications .................... 2-1 Table of various bath fluids and their properties ........7-7 Proportional Band — Fluid Table .............. 8-7 Interface Command Summary ..............9-5 Interface Command Summary continued ..........9-5...
  • Page 8 7108 User's Guide...
  • Page 9 List of Figures Figure Title Page Front Panel ....................6-2 Back Panel ....................6-4 Chart of various bath fluids and their properties ........7-6 Controller Operation Flowchart ..............8-2 Bath temperature fluctuation at various proportional band settings ..8-6 Serial Communications Cable Wiring ............9-1...
  • Page 10 7108 User's Guide viii...

  • Page 11: Before You Start

    RS-232 or optionally with a IEEE-488 interface. The tank for the 7108 is stainless steel and holds 13.2 gallons (51 liters). 1.2 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.

  • Page 12: Safety Information

    7108 Users Guide  Canadian Standards Association CAT II 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.
  • Page 13 Before You Start 1.3 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 1010-1.

  • Page 14: Cautions

    7108 Users Guide • Always replace the power cord with an approved cord of the correct rating and type. If you have questions, contact an Authorized Service Center (see Section 1.3). • High voltage is used in the operation of this equipment.
  • Page 15 Before You Start 1.3 Safety Information • The bath is a precision instrument. Although it has been designed for optimum durability and trouble free operation, it must be handled with care. The instrument should not be operated in excessively dusty or dirty environments.

  • Page 16: Authorized Service Centers

    Users Guide 1.4 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 Telefax: +1.801.763.1010 E-mail: support@hartscientific.com...
  • Page 17 Before You Start 1.4 Authorized Service Centers 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 When contacting these Service Centers for support, please have the following information available: •...
  • Page 18 7108 Users Guide...

  • Page 19: Specifications And Environmental Conditions

    Specifications and Environmental Conditions 2.1 Specifications See Table 2. Table 2. Specifications Specifications 7108 20 to 30 °C (68 to 86 °F) Operating Range with ambient temperature of 25 °C (77 °F) ±0.5 °C ( ±0.9 °F) Set-point Accuracy Display Resolution 0.01...

  • Page 20: Environmental Conditions

    7108 Users Guide 2.2 Environmental Conditions Although the instrument has been designed for optimum durability and trouble- free operation, it must be handled with care. The instrument should not be operated in an excessively dusty or dirty environment. Maintenance and cleaning recommendations can be found in the Maintenance Section of this manual.

  • Page 21: Warranty

    This section gives a brief summary of the steps required to set up and operate the 7108 bath. This should be used as a general overview and reference and not as a substitute for the remainder of the manual. Please read Section4 through6 carefully before operating the bath.

  • Page 22: Power

    7108 Users Guide 3.3 Power Plug the bath power cord into a mains outlet of the proper voltage, frequency, and current capability. Typically this will be 115 VAC ( ±10 %), 50/60 Hz, 3 A (230 VAC [ ±10 %] 50/60 Hz, 1.6 A switchable). The bath will turn on and begin to heat or cool to reach the previously programmed temperature set-point.
  • Page 23 Quick Start Setting the Temperature Press “SET” to accept the new value and display the vernier value. The bath begins 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 is displayed again. Return to the temperature display 24.73 C Bath temperature display...
  • Page 24 7108 Users Guide...

  • Page 25: Installation

    To safely move the bath, two people are required. 4.1 Bath Environment The Model 7108 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.

  • Page 26: Bath Preparation And Filling

    Users Guide 4.3 Bath Preparation and Filling The Model 7108 bath is not provided with a fluid. Various fluids are available from Hart Scientific and other sources. Depending on the desired temperature range, any of the following fluids, as well as others, may be used in the bath: •...

  • Page 27: Bath Use

    Chapter 5 Bath Use 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. 5.1 General Be sure to select the correct fluid for the temperature range of the calibration.

  • Page 28: Comparison Calibration

    7108 Users Guide 5.2 Comparison Calibration Comparison calibration involves testing a probe (unit under test, UUT) against a reference probe. After inserting the probes to be calibrated into the bath, allow sufficient time for the probes to settle and the temperature of the bath to stabilize.

  • Page 29: Parts And Controls

    Chapter 6 Parts and Controls 6.1 Front Control Panel The following controls and indicators are present on the controller front panel (see Figure 1 below): (1) the digital LED display, (2) the control buttons, (3) the bath on/off power switch, and (4) the control indicator light. (1) The digital display is an important part of the temperature controller because it not only displays set and actual temperatures but also displays various bath functions, settings, and constants.

  • Page 30: Back Panel

    7108 Users Guide fig_1.eps Figure 1. Front Panel 6.2 Back Panel The back panel has seven standard features and one optional features (see Figure 2): 1) the probe connector, 2) the stirrer power outlet, 3) system fuses, 4) the power cord, 5) the drain valve, 6) serial number notation, 7) the RS-232 interface connector, and 8) the IEEE-488 interface connector (optional).
  • Page 31 Parts and Controls 6.2 Back Panel fig_2.eps Figure 2. Back Panel...
  • Page 32 7108 Users Guide...

  • Page 33: General Operation

    Place a label above the power cord indicating the voltage. 7.2 Bath Fluid Many fluids will work with a 7108 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, electrical resistivity, fluid lifetime, safety, and cost.

  • Page 34: Viscosity

    7108 Users Guide 7.2.2 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.

  • Page 35: Safety

    General Operation 7.2 Bath Fluid 7.2.8 Safety When choosing a fluid always consider the safety issues associated. Obviously, where there are extreme temperatures there can be danger to personnel and equipment. Fluids may also be hazardous for other reasons. Some fluids maybe considered toxic.

  • Page 36: Ethylene Glycol

    7108 Users Guide 7.2.10.2 Ethylene Glycol The temperature range of water may be extended by using a solution of 1 part water and 1 part ethylene glycol (antifreeze). The characteristics of the ethylene glycol-water solution are similar to water. Use caution with ethylene glycol since the fluid is very toxic.

  • Page 37: About The Graph

    General Operation 7.2 Bath Fluid The charts include information on a variety of fluids which are often used as heat transfer fluid in baths. Because of the temperature range some fluids may not be useful with your bath. 7.2.11.2 About the Graph The fluid graph visually illustrates some of the important qualities of the fluids shown.
  • Page 38 7108 Users Guide fig_3.eps Figure 3. Chart of various bath fluids and their properties Decomposition: All high temperature fluids may be reach a temperature point at which decomposition of some form will begin. While it always begins slowly at some lower temperature, the rate can increase to the point of danger or...

  • Page 39: Stirring

    General Operation 7.3 Stirring table_3.eps Table 3. Table of various bath fluids and their properties 7.3 Stirring Stirring of the bath fluid is very important for stable temperature control. The fluid must be mixed well for good temperature uniformity and fast controller response. The stirrer is precisely adjusted for optimum performance.

  • Page 40: Power

    7108 Users Guide 7.4 Power Power to the bath is provided by an AC mains supply of 115 VAC ( ±10 %), 60 Hz, 3 A [230 VAC ( ±10 %), 50 Hz, 1.6 A switchable]. Power to the bath passes through a filter to prevent switching spikes from being transmitted to other equipment.

  • Page 41: Controller Operation

    Chapter 8 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 display 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 proportional band, and program the probe parameters, and serial and IEEE-488 interface configuration.
  • Page 42 7108 Users Guide To set the bath temperature one must first select the set-point memory. This function is accessed from the temperature display function by pressing “SET”. The number of the set-point memory currently being used is shown at the left on the display followed by the current set-point value.

  • Page 43: Set-Point Value

    Controller Operation 8.2 Temperature Set-point Set-point memory 1, 25.0 °C currently used 25.0 To change the set-point memory press “UP” or “DOWN”. New set-point memory 4, 27.0 °C 27.0 Press “SET” to accept the new selection and access the set-point value. Accept selected set-point memory 8.2.2 Set-point Value...

  • Page 44: Temperature Scale Units

    7108 Users Guide Current vernier value in °C 0.00000 To adjust the vernier press “UP” or “DOWN”. Unlike most functions the vernier setting has immediate effect as the vernier is adjusted. “SET” need not be pressed. This allows one to continually adjust the bath temperature with the vernier as it is displayed.

  • Page 45: Secondary Menu

    Controller Operation 8.4 Secondary Menu 0.00000 Vernier setting Access scale units selection Un= C Scale units currently selected Press “UP” or “DOWN” to change the units. Un= F New units selected Press “SET” to accept the new selection and resume displaying the bath temperature.

  • Page 46: Proportional Band

    7108 Users Guide 8.6 Proportional Band In a proportional controller such as this the heater output power is proportional to the bath temperature over a limited range of temperatures around the set-point. This range of temperature is called the proportional band. At the bottom of the proportional band the heater output is 100 %.

  • Page 47: Controller Configuration

    Controller Operation 8.7 Controller Configuration The proportional band width is easily adjusted from the bath front panel. The width may be set to discrete values in degrees C or F depending on the selected units. The optimum proportional band width setting may be determined by monitoring the stability with a high resolution thermometer or with the controller percent output power display.

  • Page 48: Probe Parameters

    7108 Users Guide 8.8 Probe Parameters The probe parameter menu is indicated by, PrObE Probe parameters menu Press “SET” to enter the menu. The probe parameters menu contains the parameters, D0 and Dg, which characterize the resistance-temperature relationship of the thermistor control probe. These parameters may be adjusted to improve the accuracy of the bath.

  • Page 49: Sample Period

    Controller Operation 8.9 Serial Interface Parameters The baud rate of the bath serial communications may be programmed to 300, 600, 1200, or 2400 baud. Use “UP” or “DOWN” to change the baud rate value. 2400 b New baud rate Press “SET” to set the baud rate to the new value or “EXIT” to abort the operation and skip to the next parameter in the menu.

  • Page 50: Linefeed

    7108 Users Guide 8.9.4 Linefeed The final parameter in the serial interface menu is the linefeed mode. This parameter enables (on) or disables (off) transmission of a linefeed character (LF, ASCII 10) after transmission of any carriage-return. The linefeed parameter is...

  • Page 51: Digital Communication Interface

    Chapter 9 Digital Communication Interface The 7108 bath is capable of communicating with and being controlled by other equipment through the digital interface. The instrument comes standard with an RS-232 serial interface or optionally with an IEEE-488 GPIB interface. With a digital interface the bath may be connected to a computer or other equipment.

  • Page 52: Baud Rate

    “SAmPLE”. The sample period is the time period in seconds between temperature measurements transmitted from the serial interface. If the sample rate is set to 5, the 7108 transmits the current measurement over the serial interface approximately every five seconds. The automatic sampling is disabled with a sample period of 0.

  • Page 53: Setup

    Digital Communication Interface 9.2 IEEE-488 Communication the GPIB cable should be shielded. 9.2.1 Setup To use the IEEE-488 interface first connect an IEEE-488 standard cable to the back of the bath. Next set the device address. This parameter is programmed within the IEEE-488 interface menu.

  • Page 54: Interface Commands

    7108 Users Guide 9.3 Interface Commands The various commands for accessing the bath controller functions via the digital interfaces are listed in this section (see Table 5). These commands are used with both the RS-232 serial interface and the IEEE-488 GPIB interface. In either case the commands are terminated with a carriage-return character.
  • Page 55 Digital Communication Interface 9.3 Interface Commands Table 5. Interface Command Summary...
  • Page 56 7108 Users Guide Table 6. Interface Command Summary continued...

  • Page 57: Calibration Procedure

    Chapter 10 Calibration Procedure The user may want to calibrate the bath to improve the temperature set-point accuracy. Calibration is done by adjusting the probe calibration constant D0 so that the temperature of the bath as measured with a standard thermometer agrees more closely with the bath set-point.
  • Page 58 7108 Users Guide 10-2...

  • Page 59: Maintenance

    Chapter 11 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 60: Draining The Bath

    7108 Users Guide • If a hazardous material is spilt on or inside the equipment, the user is responsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material. MSDS sheets applicable to all fluids used in the baths should be kept in close proximity to the instrument.

  • Page 61: Troubleshooting

    Chapter 12 Troubleshooting If problems arise while operating the 7108, this section provides some suggestions that may help you solve the problem. A wiring diagram is also included. 12.1 Troubleshooting Below are several situations that may arise followed by suggested actions to take for fixing the problem.

  • Page 62: Master Reset Sequence

    7108 Users Guide The controller controls or attempts to control at an inaccurate temperature • The controller operates normally except when controlling at a specified set- point. At this set-point, the temperature does not agree with that measured by the user’s reference thermometer to within the specified accuracy. This...

  • Page 63: Ce Comments

    Troubleshooting 12.2 CE Comments 12.2 CE Comments 12.2.1 EMC Directive Hart Scientific’s equipment has been tested to meet the European Electromagnetic Compatibility Directive (EMC Directive, 89/336/EEC). Selection of Light Industrial or Heavy Industrial compliance has been based on the intended use of the instrument. Units designed for use in a calibration laboratory have been tested to Light Industrial Standards.
  • Page 64 7108 Users Guide Via Acquanera, 29 22100 Como tel. 031.526.566 (r.a.) fax 031.507.984 info@calpower.it www.calpower.it 12-4...

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