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Calibration Bath

Controller Operation

The controller may be operated in temperature units of degrees Celsius or

Fahrenheit. The controller is operated and programmed from the front control

panel using the four key switches and digital LED display. The controller may

also be optionally equipped with a serial RS-232 or IEEE-488 GPIB digital

interface for remote operation. Operation of the controller using the front control

panel is discussed following in the

Controller Operation

section. Operation using

the digital interfaces is discussed in the

Digital Communications Interface

section.
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 10–15

minutes for the temperature to settle and stabilize. There may be a small

overshoot or undershoot of about 0.5

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, set the cut-out set-point, and program the probe calibration

parameters, operating parameters, serial and IEEE-488 interface configuration,

and controller calibration parameters. Controller operations are summarized in

the flow chart in Figure 6.

Bath Temperature

The digital LED display on the front panel allows direct viewing of the actual bath

temperature. This temperature value is what is normally shown on the display.

The units, C or F, of the temperature value are displayed at the right. For

example,

Bath temperature in degrees Celsius

The temperature display function may be accessed from any other function by

pressing the “EXIT” button.

Reset Cutout

If the over-temperature cutout has been triggered, then the temperature display

alternately flashes,

Indicates cutout condition

The message continues to flash until the temperature is reduced and the cutout

is reset.
The cutout has two modes — automatic reset and manual reset. The mode

determines how the cutout is reset which allows the bath to heat up again. When

in automatic mode, the cutout resets itself as soon as the temperature is lowered

below the cutout set-point. With manual reset mode the cutout must be reset by

the operator after the temperature falls below the set-point.

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Содержание 6050H

Страница 1: ...208 March 2016 2016 Fluke Corporation All rights reserved Specifications are subject to change without notice All product names are trademarks of their respective companies 6050H Calibration Bath User s Guide ...

Страница 2: ... nearest Fluke authorized service 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 caus...

Страница 3: ... Power 11 Set the Temperature 11 Installation 13 Bath Environment 13 Dry out Period 14 Bath Preparation and Filling 14 Probe 14 Power 15 Tipping Prevention Brackets Installation 15 Installation on a Concrete Floor 15 Bath Use 16 General 17 Comparison Calibration 17 Calibration of Multiple Probes 18 Parts and Controls 18 Front Panel 18 Bath Tank and Lid 20 Back Panel 22 General Operation 24 Bath Fl...

Страница 4: ...38 Serial Interface Parameters 39 BAUD Rate 39 Sample Period 40 Duplex Mode 40 Linefeed 41 IEEE 488 Parameters 41 IEEE 488 Address 41 Calibration Parameters 42 CTO 42 CO and CG 42 H and L 43 Digital Communication Interface 44 Serial Communications 44 Wiring 44 Setup 45 Serial Operation 46 IEEE 488 Communication optional 46 Setup 46 IEEE 488 Operation 46 Interface Commands 47 Power Control Function...

Страница 5: ...iii List of Tables Table Title Page 1 Symbols 1 2 Interface Command Summary 47 3 Power Control Commands 50 ...

Страница 6: ...6050H User s Guide iv ...

Страница 7: ... Tipping Prevention Bracket Installation 16 3 Front Panel 18 4 Bath and Lid Components 20 5 Back Panel Features 23 6 Controller Operation Flow Chart 28 7 Bath Temperature Fluctuation at Various Proportional Band Settings 33 8 Serial Communication Cable Wiring 44 9 Calibration Example 53 ...

Страница 8: ...6050H User s Guide vi ...

Страница 9: ...S VOLTAGE Risk of electric shock W WARNING RISK OF DANGER Consult user documentation AC Alternating Current AC DC DC T Double Insulated PE Ground Battery Hot suface O Off I On Certified by CSA Group to North American safety standards Measurement Category II is applicable to test and measuring circuits connected directly to utilization points socket outlets and similar points of the low voltage MAI...

Страница 10: ...to the terms Warning and Caution WARNING identifies conditions and actions that may pose hazards to the user CAUTION identifies conditions and actions that may damage the in strument being used WWARNING To avoid personal injury follow these guidelines GENERAL Appropriate personal safety protection should be worn by the operator at all times while using the bath Fluke Calibration does not recommend...

Страница 11: ...pplying power such as storage in a low humidity temperature chamber operating at 50 C for 4 hours or more DO NOT operate high temperature baths 500 C near flammable materials Extreme temperatures could ignite the flammable material 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 rem...

Страница 12: ...e bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot when removed from the bath Cautiously handle probes to prevent personal injury Carefully place probes on a heat resistant surface or rack until they are at room temperature Be extremely careful when filling the bath with salt and bringing it up to temperature ...

Страница 13: ...e power cord Keep all combustible materials away from the bath when using salt Operate the bath on a heatproof surface such as concrete Provide a means of safety for containing any spill which may occur 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 precau...

Страница 14: ...cessively wet oily dusty or dirty environment 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 salt 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 an...

Страница 15: ...e used when moving the bath with the fluid solidified in the bath The control probe can easily be damaged Two people are required to safely move the bath One person should lift the bath by the tower while the second person lifts from underneath the bath tank The control probe must be inserted through the lid into the bath fluid and plugged into the socket at the back of the bath DO NOT operate the...

Страница 16: ...on please have the following information Model Number Serial Number Voltage Complete description of the problem Product Introduction The Fluke Calibration 6050H is a constant temperature bath intended mainly for the application of temperature calibration However its high stability and the availability of factory modifications make it suitable for other uses as well 6050 cross section eps Figure 1 ...

Страница 17: ...solution 0 01 C Digital Setting Accuracy 1 C Digital Setting Repeatability 0 02 C Heaters 400 1200 2000 Watts Access Opening 5 x 10 127 x 254 mm Depth 12 305 mm Wetted Parts 304 stainless steel Power 230 VAC 10 50 60 Hz 10 A 2200 W Volume 7 1 gallons 27 liters requires 112 lb of bath salt Weight 180 lb 82 kg Size 28 5 H x 20 4 W x 24 5 D 724 x 518 x 622 mm Automation Package Interface it software ...

Страница 18: ...ld be minimized altitude less than 2 000 meters indoor use only Quick Start WCaution READ the Bath Use section before placing the bath in service Incorrect handling can damage the bath and void the warranty This section gives a brief summary of the steps required to set up and operate the 6050H bath This should be used as a general overview and reference and not as a substitute for the remainder o...

Страница 19: ...alled Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability See the Specifications section for power details Additionally a separate ground connection is provided and required to permanently connect the instrument to earth ground for added operator safety Set the Temperature In the following discussion a solid box around the word SET UP EXIT or D...

Страница 20: ...t reaches the new set point temperature Set the heater switch to position MED or HIGH to allow the bath to more quickly reach a higher temperature The higher heater settings may be necessary to reach higher temperatures and control at high temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cutout should be corre...

Страница 21: ...with the fluid solidified in the bath The control probe can easily be damaged If the bath must be moved all the salt to solidify and cool To safely move the bath two people are required One person should lift the bath by the tower while the second person slides their hands underneath the bath tank and lifts the bath Bath Environment WCaution DO NOT place under a cabinet or other structure Allow fo...

Страница 22: ...ath is solid and prevents the stirrer from turning Fill the bath with clean unpolluted salt Fill the bath carefully through the large square access hole to a level that will allow for stirring and thermal expansion Under filling may reduce bath performance and may possibly damage the bath heater The salt should never exceed a height of 1 2 below the top of the tank See Figure 4 for reference to th...

Страница 23: ...ty of the bath under normal operating conditions Installation on a Concrete Floor Using a concrete drill and concrete drill bit drill three 1 4 inch x 1 1 4 inch deep approximately 6 5 mm x 32 mm holes in the concrete floor using the bracket to mark the hole placement Drop the flare anchor bolt into the hole Tightening the screw expands the anchor in the drilled hole and secures the bracket Ensure...

Страница 24: ...Bracket Installation Bath Use WCaution Read before placing 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 ...

Страница 25: ...hing the set point temperature Modify the access cover to accept probes for calibration The bath should be covered at all times Allowing the access cover to be open during the calibration process reduces the stability and accuracy of the test and increases the outgassing of the fluid which can cause safety concerns for attending personnel Comparison Calibration Comparison calibration involves test...

Страница 26: ...se the bath for calibration start by Placing the reference probe in the bath working area Placing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe Calibration of Multiple Probes Fully loading the bath with probes increases the time required for the temperature to stabilize after inserting the probes Using the reference probe as the gu...

Страница 27: ...ows 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 parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored 3 The on off switch controls power to the entire bath including the stirring motor 4 The control ...

Страница 28: ... The bath tank and lid assembly includes see Figure 4 the tank the control probe the stirring motor the access holes the access hole cover the drain tube WWarning The drain is for factory use only bathlid eps Figure 4 Bath and Lid Components ...

Страница 29: ... the stirring propeller to provide mixing of the bath fluid Proper mixing of the fluid is important for good constant temperature stability The stirring motor power cord plugs into the back of the bath at the power socket labelled STIRRER 4 On the bath lid is a large rectangular access hole and a small circular access hole These holes are used for placement of thermometers and devices into the bat...

Страница 30: ...0 VAC 10 10 A 50 60 Hz 2 The stirring motor power cord plugs into the socket labelled STIRRER Power to the stirring motor is switched on by the POWER switch on the control panel 3 The system and heater fuses are internal Never replace a fuse with one of a rating greater than that specified The heater fuses protect against shorted heaters 4 The control probe plugs into the bath at the socket on the...

Страница 31: ... note in next section 5 The serial number is located on the upper right corner of the back panel The series is also stamped on this panel When consulting with an Authorized Service Center use the model number and the serial number 6 If the bath is supplied with a serial RS 232 interface the interface cable is attached to the back of the bath at the connector labeled Serial Port 7 If the bath is su...

Страница 32: ...wever its viscosity is such that its functional range is from around 180 C up to the upper limit of the bath The melting temperature will change as the salt ages or becomes contaminated When the bath is not in use we recommend keeping the temperature above 230 C to prevent excessive amounts of salt from freezing on the stir shaft and other cooler parts of the tank Viscosity is low especially at hi...

Страница 33: ...ess and may take 10 hours or more Fill the bath until the liquid is a few inches below the lid The level will rise as much as two inches as it is heated to the upper temperature limit 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 opt...

Страница 34: ...ry use only During operation of the bath the drain plug must be screwed on tightly Temperature Controller The bath temperature is controlled by Fluke Calibration s unique hybrid digital analog temperature controller see Figure 3 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 tempe...

Страница 35: ...n degrees C or F monitor the heater output power adjust the controller proportional band set the cut out set point and program the probe calibration parameters operating parameters serial and IEEE 488 interface configuration and controller calibration parameters Controller operations are summarized in the flow chart in Figure 6 Bath Temperature The digital LED display on the front panel allows dir...

Страница 36: ...ive and the cutout mode is set to manual reset the display flashes cutout until the user resets the cutout To access the reset cutout function press the SET button Access cutout reset function figure 7 eps Figure 6 Controller Operation Flow Chart ...

Страница 37: ...d well below the upper temperature limit of the liquid In addition the cutout temperature should also be set below the upper limit of the fluid Setting the bath temperature involves three steps 1 select the set point memory 2 adjust the set point value 3 adjust the vernier if desired Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly reca...

Страница 38: ...ew 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 Set point Vernier The set point value can only be set with a resolution of 0 01 C The user may want to adjust the set point slightly to achieve a precise bath te...

Страница 39: ...re used in displaying the bath temperature set point vernier proportional band and cutout set point The temperature scale units selection is accessed after the vernier adjustment function by pressing SET From the temperature display function access the units selection by pressing SET 4 times Bath temperature Access set point memory Set point memory Access set point value Set point value Access ver...

Страница 40: ...e pulse cycle time 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 heating 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 lets the user know how stable the bath temperature is With good c...

Страница 41: ...nnot respond 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 figure 8 eps Figure 7 Bath Temperature Fluctuation at Various Proportional Band Settings The optimum pr...

Страница 42: ...rease the band width from this point to 3 or 4 times wider 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 Heater power in percent Access proportional band Proportional band setting To change the proportional band p...

Страница 43: ...temperature then power to the heater shuts off and the bath cools The bath cools until it reaches a few degrees below the cutout set point temperature At this point the action of the cutout is determined by the setting of the cutout mode parameter The cutout has two selectable modes automatic reset or manual reset If the mode is set to automatic the cutout automatically resets itself when the bath...

Страница 44: ...LPHA which characterize the resistance temperature relationship of the platinum control probe These parameters may be adjusted to improve the accuracy of the bath This procedure is explained in detail in the Calibration Procedure section The probe parameters are accessed by pressing SET after the name of the parameter is displayed The value of the parameter may be changed using the UP and DOWN but...

Страница 45: ... used when salt is used for the bath medium For example you can set the mode to auto and the temperature to 200 C This allows the stir motor to shut off and turn on only when the salt is a liquid 200 C preventing the stir motor from overheating and or being damaged The parameter is indicated by Stir mode selection parameter Press SET to access the parameter setting Stir motor is set for automatic ...

Страница 46: ...bath Applying full power to the heaters while the salt is solid can cause the heaters to overheat since there is poor heat conduction between the walls of the bath and the solid salt The Heat Up Power feature prevents the heaters from overheating by limiting the power When the Heat Up Power is set to Low the heaters operate at 25 power until the temperature reaches 200 C and is completely melted W...

Страница 47: ...ths fitted with the serial interface The parameters in the menu are BAUD rate sample period duplex mode and linefeed BAUD Rate The BAUD rate is the first parameter in the menu The BAUD rate setting determines the serial communications transmission rate The BAUD rate parameter is indicated by Serial BAUD rate parameter Press SET to choose to set the BAUD rate The current baud rate value will then b...

Страница 48: ...e period The current sample period value will be displayed Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value 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 bath via the serial interface are immediatel...

Страница 49: ...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 This menu does not appear on baths not fitted with the interface The menu is indicated by IEEE 488 parameters menu Press SET to enter the menu IEEE 488 Address The IEEE 488 interface must be configured to use the same address as the extern...

Страница 50: ...eration of the bath The calibration parameters menu is indicated by Calibration parameters menu Press SET five times to enter the menu The display now shows CTO Parameter CTO sets the calibration of the over temperature cutout This parameter is not adjusted through software It is adjusted with an internal potentiometer The following values are set by the factory 565 C 5 C CO and CG These parameter...

Страница 51: ...550 C 0 C Low 0 C 0 C Note DO NOT change the values of these parameters from the factory set values To do so may present danger of the bath overheating and causing damage or fire To adjust press SET to show the current value of H Use the UP and DOWN keys until the value matches the factory settings listed above Press SET to store the value The display now shows Press SET to show the current value ...

Страница 52: ...ed To enable the digital interface to control the heater the HEATER switch must be set to the LOW position Serial Communications The bath may be installed with an RS 232 serial interface that allows serial digital communications over fairly long distances With the serial interface the user may access any of the functions parameters and settings discussed in the Controller Operation section with th...

Страница 53: ...the new value or EXIT to abort the operation and skip to the next parameter in the menu Sample Period The sample period is the next parameter in the menu and prompted with 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 bath transmits the current measurement over the serial interface ap...

Страница 54: ...tandard cable to the back of the bath Next set the device address This parameter is programmed within the IEEE 488 interface menu To enter the IEEE 488 parameter programming menu first press EXIT while pressing SET and release to enter the secondary menu Press SET repeatedly until the display reaches PrObE This is the menu selection Press UP repeatedly until the IEEE 488 interface menu is indicate...

Страница 55: ...ric data denoted by n may be entered in decimal or exponential notation Characters are shown in lower case although upper case may be used Spaces may be added within command strings and are ignored Backspace BS ASCII 8 may be used to erase the previous character A terminating CR is implied with all commands Table 2 Interface Command Summary Command Description Command Format Command Example Return...

Страница 56: ... to 00399 Operating Parameters Menu Read cutout mode cm ode cm cm xxxx cm AUTO Set cutout mode cm ode r eset a ut o RESET or AUTO Set cutout to be reset manually cm ode r eset cm r Command Description Command Format Command Example Returned Returned Example Acceptable Values Set cutout to be reset automatically cm ode a uto cm a Read stirrer mode smod smod smod xxxx smod AUTO Set stirrer mode smod...

Страница 57: ... Calibration Menu Read C0 calibration parameter c0 c0 b0 9 b0 0 Set C0 calibration parameter to n c0 n c0 0 999 9 to 999 9 Read CG calibration parameter cg cg bg 999 99 bg 156 25 Set CG calibration parameter to n cg n cg 156 25 999 9 to 999 9 Read low set point limit value tl ow tl tl 999 tl 80 Set low set point limit to n tl ow n tl 80 999 9 to 999 9 Read high set point limit value th igh th th 9...

Страница 58: ...the bath can be remotely operated at any temperature within the range of the bath To allow the interface to control the heating the front panel controls are disabled by switching the heater switch to LOW Otherwise the interface would not be able to switch the heater functions off The 6050H bath has two control functions with the digital interface These control functions are for heaters settings Me...

Страница 59: ...thin the most useful operating range of the bath The farther apart the calibration temperatures the larger the calibrated temperature range but the calibration error is also greater over the range For instance if 50 C and 150 C are chosen as the calibration temperatures then the bath may achieve an accuracy of 0 03 C over the range 40 to 160 C Choosing 80 C and 120 C may allow the bath to have a b...

Страница 60: ...ctively and the data for tL tH errL and errH were as given above the new values R0 and ALPHA would be computed as 100 193 and 0 0038272 respectively Program the new values R0 and ALPHA into the controller Check the calibration by setting the temperature to tL and tH and measuring the errors again If desired the calibration procedure may be repeated again to further improve the accuracy Calibration...

Страница 61: ...Calibration Bath Calibration Procedure 53 figure 10 eps Figure 9 Calibration Example ...

Страница 62: ...sure that the level has not dropped A drop in the fluid level affects the stability 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 outlined 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 yea...

Страница 63: ...icator LED stays red but the temperature does not increase If the display does not show cutout and shows the correct bath temperature consider the following possibilities Insufficient heating Insufficient heating may be caused by the heater power setting being too low especially at higher operating temperatures Switching to the higher heater power switch setting if available may solve the problem ...

Страница 64: ...ain the memory data may become scrambled causing problems A nearby large static discharge may also affect data in memory Access the battery by removing the L shaped panel covering the display electronics Corrupt controller memory If the problem reoccurs after the battery is replaced initialize the memory by performing a Factory Reset Sequence described in a previous solution The controller display...

Страница 65: ...or how to check the probe s resistance The controller shows that it is controlling at the proper temperature but the bath temperature is unstable If the bath does not achieve the expected degree of temperature stability when measured using a thermometer consider the following Wrong proportional band setting If the proportional band is set too narrow the bath will oscillate causing poor stability I...

Страница 66: ...ontroller calibration parameters found in the CAL menu of the instrument and any user adjusted parameters that you have changed such as the programmable set points and proportional band Memory Check Doing a memory check is the easiest way to verify the ability of the battery to maintain controller parameters 1 Power off the instrument 2 Disconnect the instrument from AC power for 10 seconds 3 Reco...

Страница 67: ...patibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC Hart Scientific equipment has been designed to meet the EN 61010 1 and EN 61010 2 010 standards ...

Страница 68: ...6050H User s Guide 60 ...

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