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Fluke 7108 Скачать руководство пользователя страница 13

Before You Start

1.3 Safety Information

1

•

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. If the product is wet
or has been in a wet environment, take necessary
measures to remove moisture prior to applying power such
as storage in a low humidity temperature chamber
operating at 50

°

C for 4 hours or more.

•

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.

•

The bath is a precision instrument. Although it has been
designed for optimum durability and trouble free operation,
it must be handled with care. Position the bath before the
tank is filled with fluid by rolling it into place. DO NOT
attempt to lift the bath. DO NOT move a bath filled with
fluid.

BURN HAZARD

•

Extremely cold temperatures may be present in this
equipment. Freezer burns and frostbite may result if
personnel fail to observe safety precautions.

•

High temperatures may be present in this equipment.
Fires and severe burns may result if personnel fail to
observe safety precautions.

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 an AC
electric outlet of the appropriate voltage and frequency
(see Specifications). The power cord of the instrument is
equipped with a three-pronged grounding plug for your
protection against electrical shock hazards. It must be
plugged directly into a properly grounded three-prong
receptacle. The receptacle must be installed in
accordance with local codes and ordinances. Consult a
qualified electrician. DO NOT use an extension cord or
adapter plug.

•

DO use a ground fault interrupt device. This instrument
contains a fluid. A ground fault device is advised in case
fluid is present in the electrical system and could cause
an electrical shock.

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Содержание 7108

Страница 1: ...s reserved Specifications are subject to change without notice All product names are trademarks of their respective companies 7108 Calibration Bath User s Guide Via Acquanera 29 22100 Como tel 031 526 566 r a fax 031 507 984 info calpower it www calpower it ...

Страница 2: ...rvice center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contami...

Страница 3: ...vironmental Conditions 2 1 2 1 Specifications 2 1 2 2 Environmental Conditions 2 2 2 3 Warranty 2 2 3 Quick Start 3 1 3 1 Unpacking 3 1 3 2 Set Up 3 1 3 3 Power 3 2 3 4 Setting the Temperature 3 2 4 Installation 4 1 4 1 Bath Environment 4 1 4 2 Dry out Period 4 1 4 3 Bath Preparation and Filling 4 2 4 4 Probe 4 2 4 5 Power 4 2 5 Bath Use 5 1 5 1 General 5 1 5 2 Comparison Calibration 5 2 5 3 Calib...

Страница 4: ...e Oils 7 4 7 2 11 Fluid Characteristics Charts 7 4 7 2 11 2 About the Graph 7 5 7 3 Stirring 7 7 7 4 Power 7 8 7 5 Heater Cooling 7 8 7 6 Fluid Drain 7 8 7 7 Temperature Controller 7 8 8 Controller Operation 8 1 8 1 Bath Temperature 8 1 8 2 Temperature Set point 8 1 8 2 1 Programmable Set points 8 1 8 2 2 Set point Value 8 3 8 2 3 Set point Vernier 8 3 8 3 Temperature Scale Units 8 4 8 4 Secondary...

Страница 5: ...d 9 2 9 1 3 Serial Operation 9 2 9 2 IEEE 488 Communication 9 2 9 2 1 Setup 9 3 9 2 1 1 IEEE 488 Interface Address 9 3 9 2 2 IEEE 488 Operation 9 3 9 3 Interface Commands 9 4 10 Calibration Procedure 10 1 11 Maintenance 11 1 11 1 Draining the Bath 11 2 12 Troubleshooting 12 1 12 1 Troubleshooting 12 1 12 1 1 Master Reset Sequence 12 2 12 2 CE Comments 12 3 12 2 1 EMC Directive 12 3 12 2 2 Directiv...

Страница 6: ...7108 User s Guide iv ...

Страница 7: ...Page 1 International Electrical Symbols 1 1 2 Specifications 2 1 3 Table of various bath fluids and their properties 7 7 4 Proportional Band Fluid Table 8 7 5 Interface Command Summary 9 5 6 Interface Command Summary continued 9 5 ...

Страница 8: ...7108 User s Guide vi ...

Страница 9: ... Front Panel 6 2 2 Back Panel 6 4 3 Chart of various bath fluids and their properties 7 6 4 Controller Operation Flowchart 8 2 5 Bath temperature fluctuation at various proportional band settings 8 6 6 Serial Communications Cable Wiring 9 1 ...

Страница 10: ...7108 User s Guide viii ...

Страница 11: ... provided by the 8 digit LED display and four buttons Digital remote communications is available with a 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 Table 1 International Electric...

Страница 12: ...itions and actions that may pose hazards to the user CAUTION identifies conditions and actions that may damage the instrument being used 1 3 1 WARNINGS WARNINGS To avoid personal injury follow these guidelines GENERAL DO NOT use the instrument for any application other than calibration work The instrument was designed for temperature calibration Any other use of the instrument may cause unknown ha...

Страница 13: ...id by rolling it into place DO NOT attempt to lift the bath DO NOT move a bath filled with fluid BURN HAZARD Extremely cold temperatures may be present in this equipment Freezer burns and frostbite may result if personnel fail to observe safety precautions High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions ELECTRICAL...

Страница 14: ...sh point of the bath fluid See Section 7 2 Heat Transfer Fluid for specific information on bath fluids and Section 9 8 Cutout 1 3 2 CAUTIONS CAUTIONS To avoid possible damage to the instrument follow these guidelines Use only a grounded AC mains supply of the appropriate voltage to power the bath The bath requires 3 amps at 115 VAC 10 50 60 Hz 1 6 amps at 230 VAC 10 50 60 Hz switchable Always oper...

Страница 15: ...safety and proper operation of the bath The Factory Reset Sequence should be performed only by authorized personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Test to restore the test parameters DO NOT operate this instrument in an excessively wet oily dusty or dirty environment Most probes have handle temperature limits Be sure t...

Страница 16: ...ne 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA Phone 86 10 6 51...

Страница 17: ...ice 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 Model Number Serial Number Voltage Complete description of the problem ...

Страница 18: ...7108 Users Guide 1 8 ...

Страница 19: ...d long term temperature stability Water at 25 C 0 002 C 0 0036 F Mineral Oil at 25 C 0 004 C 0 0072 F Temperature Gradients using Water 0 005 C 0 009 F Cooling capacity 100 watt thermoelectric Controller Hybrid analog digital controller with data retention Over Temperature Control None Power Requirements 115 VAC 10 50 60 Hz 3 A 230 VAC 10 50 60 Hz 1 6 A optional 350 W switchable Work area 14 W x 8...

Страница 20: ...sty or dirty environment Maintenance and cleaning recommendations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions temperature range 5 45 C 41 113 F ambient relative humidity 15 50 pressure 75kPa 106kPa mains voltage within 10 of nominal vibrations in the calibration environment should be minimized altitude does not affect the per...

Страница 21: ...l If you are missing any item please contact an Authorized Service Center see Section 1 4 3 2 Set Up Set up of the bath requires careful unpacking and placement of the bath filling the bath with fluid installing the probe and connecting the power Allow six inches of space on both sides of the bath for proper airflow Consult Section4 for detailed instructions for proper installation of the bath Be ...

Страница 22: ...tted box indicates the display reading Explanation of the button or display reading are to the right of each button or display value To view or set the bath temperature set point proceed as follows The front panel LED display normally shows the actual bath temperature 24 68 C Bath temperature display When SET is pressed the display shows the set point memory that is currently being used and its va...

Страница 23: ...et 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 The bath heats or cools until it reaches the new set point temperature To obtain optimum control stability adjust the proportional band as discussed in Section 8 6 ...

Страница 24: ...7108 Users Guide 3 4 ...

Страница 25: ...ent any injury 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 If used at higher temperatures where fluid vaporization is significant a ...

Страница 26: ...necessary and with caution if the fluid is hot Be careful to prevent bath fluid from spilling on the stirring motor while filling NOTE Under filling may reduce bath performance and may possibly damage the bath TEDs 4 4 Probe Inspect the bath controller probe This probe should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it contains a precision therm...

Страница 27: ...ly at that single temperature This means that the type of bath fluid does not have to change Additionally the bath can be left energized reducing the stress on the system It is advisable to wipe the probe with a clean soft cloth or paper towel before inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid salt carefully ...

Страница 28: ... 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 When calibrating over a wide temperature range better results can generally be achieved by starting at the highest t...

Страница 29: ...set the bath temperature set point and to access and set other operating parameters A brief description of the functions of the buttons follows SET Used to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of settable parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any ...

Страница 30: ...uses are 3 A for 115 VAC and 1 6 A for 230 VAC 4 The power cord is rated at 115 VAC 15 amps 5 A drain valve is provided for ease of removing the fluid media from the bath Always use a container of adequate size to hold the FULL LOAD of fluid Some oils are more easily drained at higher temperatures See caution note in next section 6 The serial number is located on the bottom right side of the back ...

Страница 31: ...Parts and Controls 6 2 Back Panel 6 6 3 fig_2 eps Figure 2 Back Panel ...

Страница 32: ...7108 Users Guide 6 4 ...

Страница 33: ...deration 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 7 2 1 Temperature Range One of the most important characteristics to consider is the temperature range of the fluid Few fluids work well throughout the complete temperature range of the bath Th...

Страница 34: ...ontroller may require a decreased proportional band to compensate for the decrease in sensitivity of the bath temperature to heat input 7 2 4 Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid Thermal conductivity of the fluid affects the control stability temperature uniformity and probe temperature settling time Fluids with higher conductivity distribute h...

Страница 35: ...s inside the tank and the open cup represents the vapors escaping the tank Oxygen and an ignition source will be less available inside the tank Environmentally hazardous fluids require special disposal according to applicable federal or local laws after use 7 2 9 Cost Cost of bath fluids may vary greatly from cents per gallon for water to hundreds of dollars per gallon for synthetic oils Cost may ...

Страница 36: ... 5 Silicone Oils Silicone oils are available which offer a much wider operating temperature range than mineral oil Like most oils silicone oils have temperature control characteristics which are somewhat poorer than water The viscosity changes significantly with temperature and thermal expansion also occurs These oils have very high electrical resistivity Silicon oils are fairly safe These oils ar...

Страница 37: ...Points shown are at 50 and 10 centistokes Greater than 50 centistokes stirring is very poor and unsatisfactory for bath applications At 10 centistokes and below optimum stirring can occur These are rules of thumb which have been useful for most applications Fume Point The point at which a fume hood should be used This point is very subjective in nature and is impacted by individual tolerance to di...

Страница 38: ...ir 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 impracticality at a higher temperature ...

Страница 39: ...us 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 ...

Страница 40: ...ific s unique hybrid digital analog temperature controller The controller offers the tight control stability of an analog temperature controller as well as the flexibility and programmability of a digital controller The bath temperature is monitored with a thermistor sensor in the control probe The signal is electronically compared with the programmable reference signal amplified and then fed to a...

Страница 41: ...ight For example 25 00 C Bath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button 8 2 Temperature Set point The bath temperature can be set to any value within the range and with resolution as given in the specifications The temperature range of the particular fluid used in the bath must be known by the operator and th...

Страница 42: ...ccessed 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 25 00 C Bath temperature in degrees Celsius Access set point memory fig_4 eps Figure 4 Controller Operation Flowchart ...

Страница 43: ...C 28 00 New set point value When the desired set point value is reached press SET to accept the new value and access the set point vernier If EXIT is pressed instead then any changes made to the set point will be ignored Accept new set point value 8 2 3 Set point Vernier The set point value can only be set with a resolution of 0 000032 C The user may want to adjust the set point slightly to achiev...

Страница 44: ...emperature scale units selection Access scale units 8 3 Temperature Scale Units The temperature scale units of the controller may be set by the user to degrees Celsius C or Fahrenheit F These units are used in displaying the bath temperature set point vernier and proportional band The temperature scale units selection is accessed after the vernier adjustment function by pressing SET From the tempe...

Страница 45: ... to the TEDs The total power being applied to the TED is determined by the duty cycle This value may be estimated by watching the red green control indicator light or read directly from the digital display By knowing the amount of power to the bath the user can tell if the bath is heating up to the set point cooling down or controlling at a constant temperature Monitoring the percent heater power ...

Страница 46: ...ond very well to changing conditions or noise in the system If the proportional band is too narrow the bath temperature may swing back and forth because the controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width fig_5 eps Figure 5 Bath temperature fluctuation at various proportional band settings The optimum proportional b...

Страница 47: ...04 C The proportional band adjustment may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional band Access heater power in secondary menu 12 Pct Heater power in percent Access proportional band Pb 0 101C Proportional band setting To change the proportional band press UP or DOWN Pb 0 060C New proport...

Страница 48: ...es that may have been made 8 8 1 D0 This probe parameter refers to the resistance of the control probe at 0 C Normally this is set for 25 2290 ohms 8 8 2 Dg This probe parameter refers to the average sensitivity of the probe between 0 and 100 C Normally this is set for 186 9740 8 9 Serial Interface Parameters The serial interface parameters menu is indicated by SErIAL Serial RS 232 interface param...

Страница 49: ...g is disabled with a sample period of 0 The sample period is indicated by SAmPLE Serial sample period parameter Press SET to choose to set the sample period The current sample period value will be displayed SA 1 Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value SA 60 New sample period 8 9 3 Duplex Mode The next parameter i...

Страница 50: ...ths 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 This menu does not appear on baths not fitted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Press SET to enter the menu 8 10 1 IEEE 488 Address The IEEE 488 interface must be configured to use the same address as the externa...

Страница 51: ...ommunications over fairly long distances With the serial interface the user may access any of the functions parameters and settings discussed in Section8 with the exception of the BAUD rate setting The serial interface uses 8 data bits 1 stop bit and no parity 9 1 1 Wiring The serial communications cable attaches to the bath through the DB 9 connector at the back of the instrument Figure 6 shows t...

Страница 52: ... SET to choose to set the sample period Adjust the period with UP or DOWN and then use SET to set the sample rate to the displayed value 9 1 2 3 Duplex Mode The next parameter is the duplex mode indicated with dUPL The duplex mode may be set to half duplex HALF or full duplex FULL With full duplex any commands received by the thermometer via the serial interface are immediately echoed or transmitt...

Страница 53: ...y until the IEEE 488 interface menu is indicated with IEEE Press SET to enter the IEEE 488 parameter menu The IEEE 488 menu contains the IEEE 488 address parameter 9 2 1 1 IEEE 488 Interface Address The IEEE 488 address is prompted with AddrESS Press SET to program the address The default address is 22 Change the device address of the bath if necessary to match the address used by the communicatio...

Страница 54: ...and A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example s CR will return the current set point and s 25 00 CR will set the set point to 25 00 degrees In the following list of commands characters or data within brackets and are optional for the command A slash denotes alternate characte...

Страница 55: ...Digital Communication Interface 9 3 Interface Commands 9 9 5 Table 5 Interface Command Summary ...

Страница 56: ...7108 Users Guide 9 6 Table 6 Interface Command Summary continued ...

Страница 57: ...re of the bath minus the set point temperature For example if the bath is set for a set point of 25 C and the bath stabilizes at a temperature of 24 782 C then the error is 0 218 C Next calculate a new value for the D0 parameter To do this you need to find the present value of D0 You can find it in the Probe sub menu in the Config section of the secondary menu see Section 9 8 The default value for...

Страница 58: ...7108 Users Guide 10 2 ...

Страница 59: ...bility of the bath Changes in fluid level are dependent upon several factors specific to the environment in which the equipment is used A schedule cannot be out lined to meet each environmental setting Therefore the first year the bath should be checked weekly with notes kept as to changes in bath fluid After the first year the user can set up a maintenance schedule based on the data specific to t...

Страница 60: ... any foreign materials from the bath Silicone oils as well as others may evaporate off their lighter components over a period of time leaving the very viscous components remaining In addition some decomposition occurs which may impair the temperature stability of the bath When this happens the fluid is generally very dark to black and viscous Vegetable oils polymerize turn plastic like after they ...

Страница 61: ...ord is plugged in and connected to the unit Red LED on display is blank Check that there is power to the unit If the display flashes any error code Initialize the system by performing the master reset sequence If the unit repeats the error code contact Hart Scientific Customer Support for a return authorization and for instructions on returning the unit The displayed process temperature is in erro...

Страница 62: ...ess temperature is unstable If the bath temperature does not achieve the expected degree of stability when measured using a thermometer try adjusting the proportional band to a narrower width as discussed in Section 8 6 The controller alternately heats for a while then cools This oscillation is typically caused by the proportional band being too narrow Increase the width of the proportional band u...

Страница 63: ...s designed for use in a calibration laboratory have been tested to Light Industrial Standards Units designed to be used in the field have been tested to both Light Industrial and Heavy Industrial Standards The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested 12 2 2 Directive Safety In order to comply with the European Low Voltage Directive 73 ...

Страница 64: ...7108 Users Guide 12 4 Via Acquanera 29 22100 Como tel 031 526 566 r a fax 031 507 984 info calpower it www calpower it ...

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