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8.3

Power

Power to the bath is provided by an AC mains supply. See Section 3.1, Specifi-
cations, for power details. Power to the bath passes through a filter to prevent
switching spikes from being transmitted to other equipment.

To turn on the bath switch the control panel power switch to the ON position.
The stir motor will turn on, the LED display will begin to show the bath tem-

25

General Operation

Fluid
(# = Fluke Part
No.)

Lower
Temperature
Limit*

Upper
Temperature
Limit*

Flash
Point

Viscosity
(centistokes)

Specific
Gravity

Specific Heat
(cal/g/°C)

Thermal
Conductivity
(cal/s/cm/°C)

Thermal
Expansion
(cm/cm/°C)

Resistivity
(10

1 2

Ω

-cm )

Halocarbon 0.8
#5019

–100°C (v)** 70°C (e)

NONE 5.7 @ –50°C

0.8 @ 40°C
0.5 @ 70°C

1.71 @ 40°C

0.2

0.0004

0.0011

Methanol

–96°C (fr)

10°C (fl,cc)

12°C

1.3 @ –35°C
0.66 @ 0°C
0.45 @ 20°C

0.810 @ 0°C
0.792 @ 20°C

0.6

0.0005 @
20°C

0.0014 @
25°C

Water

0°C (fr)

95°C (b)

NONE 1 @ 25°C

0.4 @ 75°C

1.00

1.00

0.0014

0.0002 @
25°C

Ethylene
Glycol—50%
#5020

–30°C (fr)

90°C (b)

NONE 7 @ 0°C

2 @ 50°C
0.7 @ 100°C

1.05

0.8 @ 0°C

0.001

Mineral Oil No.7
#5011

10°C (v)

166°C (fl)

168°C 15 @ 75°C

5 @ 125°C

0.87 @ 25°C
0.84 @ 75°C
0.81 @ 125°C

0.48 @ 25°C
0.53 @ 75°C
0.57 @ 125°C

0.00025 @
25°C

0.0007 @
50°C

5 @ 25°C

Silicone Oil Type
200.05 #5010

–40°C (v)**

130°C (fl, cc)

133°C 5 @ 25°C

0.92 @ 25°C

0.4

0.00028 @
25°C

0.00105

1000 @ 25°C
10 @ 150°C

Silicone Oil Type
200.10 #5012

–30°C (v)**

209°C (fl, cc)

211°C 10 @ 25°C

3 @ 135°C

0.934 @ 25°C 0.43 @ 40°C

0.45 @ 100°C
0.482 @
200°C

0.00032 @
25°C

0.00108

1000 @ 25°C
50 @ 150°C

Silicone Oil Type
200.20 #5013

10°C (v)

230°C (fl, cc)

232°C 20 @ 25°C

0.949 @ 25°C 0.370 @ 40°C

0.393 @
100°C
0.420 @
200°C

0.00034 @
25°C

0.00107

1000 @ 25°C
50 @ 150°C

Silicone Oil Type
200.50 #5014

30°C (v)

278°C (fl, cc)

280°C 50 @ 25°C

0.96 @ 25°C

0.4

0.00037 @
25°C

0.00104

1000 @ 25°C
50 @ 150°C

Silicone Oil Type
550 #5016

70°C (v)

230°C (fl, cc)
300°C (fl, oc)

232°C 50 @ 70°C

10 @ 104°C

1.07 @ 25°C

0.358 @ 40°C
0.386 @
100°C
0.433 @
200°C

0.00035 @
25°C

0.00075

100 @ 25°C
1 @ 150°C

Silicone Oil Type
710 #5017

80°C (v)

300°C (fl, oc)

302°C 50 @ 80°C

7 @ 204°C

1.11 @ 25°C

0.363 @ 40°C
0.454 @
100°C
0.505 @
200°C

0.00035 @
25°C

0.00077

100 @ 25°C
1 @ 150°C

Silicone Oil Type
210-H

66°C (v)

313°C (fl, oc)

315°C 50 @ 66°C

14 @ 204°C

0.96 @ 25°C

0.34 @

100°C

0.0003

0.00095

100 @ 25°C
1 @ 150°C

Heat Transfer
Salt
#5001

180°C (fr)

550°C

NONE 34 @ 150°C

6.5 @ 300°C
2.4 @ 500°C

2.0 @ 150°C
1.9 @ 300°C
1.7 @ 500°C

0.33

0.0014

0.00041

1.7

Ω

/cm

3

*Limiting Factors — b - boiling point

e - high evaporation

fl - flash point

fr - freeze point

v - viscosity — Flash point test oc = open cup

cc

= closed cup
**Very low water solubility, ice will form as a slush from condensation below freezing.

Table 2

Table of various fluids and their properties.

Содержание 7009

Страница 1: ...7009____ugeng0000 7009 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: ...ervice center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination to the nearest Fluke au thorized service center Fluke assumes no risk for damage in transit Following warranty repair the prod uct will be returned to Buyer transportation prep...

Страница 3: ...s 9 3 2 Environmental Conditions 9 4 Quick Start 11 4 1 Set Up 11 4 2 Power 11 4 3 Setting the Temperature 11 5 Installation 13 5 1 Unpacking 13 5 2 Bath Environment 13 5 3 Bath Preparation and Filling 13 5 4 Probe 14 5 5 Power 14 6 Bath Use 15 6 1 General 15 6 2 Comparison Calibration 15 6 3 Calibration of Multiple Probes 16 7 Parts and Controls 17 7 1 Front Control Panel 17 7 2 Side Panel 18 7 3...

Страница 4: ...ter 26 8 5 Cooling 26 8 6 Temperature Controller 27 9 Controller Operation 29 9 1 Bath Temperature 29 9 2 Reset Cutout 29 9 3 Temperature Set point 31 9 3 1 Programmable Set points 31 9 3 2 Set point Value 32 9 3 3 Set point vernier 32 9 4 Temperature Scale Units 33 9 5 Secondary Menu 33 9 6 Heater Power 34 9 7 Proportional Band 34 9 8 Cutout 36 9 9 Controller Configuration 37 9 10 Probe Parameter...

Страница 5: ... 10 1 2 4 Linefeed 44 10 1 3 Serial Operation 44 10 2 IEEE 488 communication optional 45 10 2 1 Setup 45 10 2 1 1 IEEE 488 Interface Address 45 10 2 2 IEEE 488 Operation 45 10 3 Interface Commands 45 10 4 Power Control Functions 48 10 4 1 Heater Control 48 10 4 2 Cooling Control 48 11 Bath Calibration 51 11 1 Calibration Points 51 11 2 Measuring the Set point Error 51 11 3 Computing D0 and DG 51 1...

Страница 6: ...ure 4 Back Panel 20 Figure 5 Chart of various bath fluids and their properties 24 Figure 6 Flowchart showing the various menu options 30 Figure 7 Bath temperature fluctuation at various proportional band settings 35 Figure 8 Serial Communications Cable Wiiring 43 Figure 9 Sample calibration computations 53 ...

Страница 7: ...Table of various fluids and their properties 25 Table 3 Proportional Band Fluid Table 35 Table 4 Interface Command Summary 46 Table 4 Interface Command Summary continued 47 Table 5 Temperature Range Control Functions 49 Table 6 Serial Power Control Functions 49 ...

Страница 8: ...used on the instrument or in this manual Symbol Description AC Alternating Current AC DC Battery CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On 1 Before You Start Table 1 International Electrical Symbols ...

Страница 9: ...and actions that may damage the instru ment being used 1 2 1 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 hazards to the user DO NOT use the instrument in environments other than those listed in the ...

Страница 10: ...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 a 230V AC electric outlet of the appropriate frequency The power cord of the instrument is equipped with a three pronged grounding pl...

Страница 11: ...the electrical system See Section 5 3 Bath Preparation and Filling for specific instruc tions Read Section 6 Bath Use before placing the bath into service DO NOT turn the bath on without fluid in the tank and the heating coils fully immersed DO NOT change the values of the bath calibration constants from the fac tory set values The correct setting of these parameters is important to the safety and...

Страница 12: ... for longer than 5 seconds the bath de energizes An amber indicator on the back panel lights when this con dition exists Re energization is automatic upon correction of the fault condition and af ter a delay cycle of about 2 minutes If a fault condition exists upon appli cation of power the bath will not energize Under and Over Voltage Protection at 230 VAC Voltage Cutout 12 5 203 257 VAC Voltage ...

Страница 13: ...ax 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 When contacting these Service Centers for support please have the following information available Model Number Serial Number Voltage Complete d...

Страница 14: ...The controller uses a microcontroller to execute the many operating functions User interface is provided by the 8 digit LED display and four key switches Digital remote communications is optionally available with a RS 232 or IEEE 488 interface The tank for the 7009 is stainless steel and holds 157 liters 7 Introduction SET HEATER MODE DOWN UP EXIT HIGH LOW POWER COOLING HEATING O I O I 7009 HIGH P...

Страница 15: ...50 Hz optional Volume 167 liters 44 gallons Weight 150 kg 330 lb Size 109 2 cm H X 113 cm W X 86 4 cm D 43 X 44 5 X 34 Safety OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 The soft cutout of the instrument has been set at the factory to 50 C to protect standard resistors placed in the bath In order to use the bath for other calibration purposes the user should insure that t...

Страница 16: ... for temperature 31 C de creasing linearly to 50 at 40 C pressure 75kPa 106kPa mains voltage within 10 of nominal vibrations in the calibration environment should be minimized altitude less than 2 000 meters indoor use only User s Guide 10 ...

Страница 17: ...ugh the lid into the bath and plugged into the socket at the back of the bath 4 2 Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability See Section 3 1 Specifications for power details Set the HEATER switch on the front panel to position LOW and turn the bath on using the front panel POWER switch The bath will turn on and begin to heat or cool to...

Страница 18: ...73 C Bath temperature display The bath will heat or cool 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 When setting the set point temperature be careful not to exceed the temperature limit of the bath f...

Страница 19: ...rt etc The surface where the bath is placed must be level If used at higher temperatures where fluid vaporization is significant use of a fume hood is recommended 5 3 Bath Preparation and Filling The 7009 bath is designed for use with standard resistors therefore the soft cutout of the instrument has been set at the factory to 50 C to protect standard resistors placed in the bath In order to use t...

Страница 20: ...the bath controller probe It should not be bent or damaged in any way Reasonable caution should be used in handling this probe as it contains a preci sion platinum sensor and is mechanically shock sensitive Dropping striking or other physical shock may cause a shift in resistance in the probe resulting in diminished bath accuracy If damaged the probe can be replaced Contact a Fluke Calibration Aut...

Страница 21: ...able 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 wash the probe in warm water and dry completely before transferring it to another fluid Always be sure that the probe is completely dry before in serting it into a hot fluid Some of ...

Страница 22: ...an generally be achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The ob ject is to keep the reference probe and the probe s to be calibrated as closely grouped as possible in the working area of the bath ...

Страница 23: ...s and set other operating parameters and access and set bath calibration 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 24: ...a cooling valve HIGH is provided 1 The BACK PRESSURE valve adjustment is used to control the amount of cooling supplied to the system This valve reduces the cooling capac ity by restricting the flow of refrigerant to the bath allowing the adjust ment of the heating to cooling percentage Under normal operation the valve should be fully open counter clockwise 2 The COOLING TEMPERATURE regulating val...

Страница 25: ...BE CONNECTOR in the back panel is used for the temperature controller probe 2 The STIRRER POWER is provided for the stirring motor 3 The HEATER FUSES are 10 amp 4 POWER CORD See Section 3 1 Specifications for power details 5 The ELECTRONICS FUSE is located inside the cabinet and is a 1 4 amp fuse If the fuse needs to be replaced contact a Fluke Calibration Autho rized Service Center for assistance...

Страница 26: ...damaged by high temperatures as required 9 A drain valve is provided for ease of removing the fluid media from the bath It is advisable to use a container of adequate size to hold the full load of fluid Some oils are more easily drained at higher temperatures 10 The SYSTEM FUSES not shown are located inside the cabinet If the fuse needs to be replaced contact a service center for assistance User s...

Страница 27: ...of the fluid 8 1 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 vis cosity fluid mixing is better which creates a more uniform temperature throughout the bath This improves the bath response time which allows it to maintain a more constant temperature For good control the viscosit...

Страница 28: ...occur through the fluid In this case consider a fluid with very low electrical conductivity or high resistivity 8 1 7 Fluid lifetime Many fluids degrade over time because of evaporization water absorption gel ling or chemical breakdown Often the degradation becomes significant near the upper temperature limit of the fluid 8 1 8 Safety When choosing a fluid always consider the safety issues associa...

Страница 29: ...ne glycol must be disposed of properly 8 1 10 3 Methanol Methanol or methyl alchohol is often used at low temperatures below 0C Methanol is relatively inexpensive has good control characteristics and has a low freeze point Methanol is very toxic so care must be taken when using and disposing of this fluid 8 1 10 4 Mineral Oil Mineral oil or paraffin oil is often used at moderate temperatures above...

Страница 30: ...nt 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 User s Guide 24 Figure 5 Chart of various bath fluids and their properties ...

Страница 31: ... 05 5010 40 C v 130 C fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 25 C 0 00105 1000 25 C 10 150 C Silicone Oil Type 200 10 5012 30 C v 209 C fl cc 211 C 10 25 C 3 135 C 0 934 25 C 0 43 40 C 0 45 100 C 0 482 200 C 0 00032 25 C 0 00108 1000 25 C 50 150 C Silicone Oil Type 200 20 5013 10 C v 230 C fl cc 232 C 20 25 C 0 949 25 C 0 370 40 C 0 393 100 C 0 420 200 C 0 00034 25 C 0 00107 1000 25 C 50 150 C S...

Страница 32: ...l at lower temperatures and for scan ning at slower rates When controlling at the HIGH heater power setting instead of LOW the proportional band may need to be increased typically by a factor of four to compensate for the increase in power gain Otherwise the temperature may oscillate 8 5 Cooling The BACK PRESSURE control valve limits the cooling capacity of the unit It will normally be open all th...

Страница 33: ... also equipped with a separate thermocouple temperature monitoring circuit which will shut off the heater if the temperature exceeds the cutout set point The controller allows the operator to set the bath temperature with high resolu tion set the cutout adjust the proportional band monitor the heater output power and program the controller configuration and calibration parameters The controller ma...

Страница 34: ...rees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button 9 2 Reset Cutout If the over temperature cutout has been triggered then the temperature display will alternately flash cutout Indicates cut out condition The message will continue to flash until the temperature is reduced and the cut out is reset The cutout has two modes automatic rese...

Страница 35: ...User s Guide 30 Figure 6 Flowchart showing the various menu options ...

Страница 36: ...per limit of the fluid Setting the bath temperature involves three steps 1 select the set point mem ory 2 adjust the set point value and 3 adjust the vernier if desired 9 3 1 Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the bath to a previously programmed tem perature set point To set the bath temperatur...

Страница 37: ...t point slightly to achieve a precise bath temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed from the set point by pressing SET The vernier setting is displayed as a 6 digit num ber with five digits after the decimal...

Страница 38: ...s set point memory 1 25 0 Set point memory Access set point value C 40 00 Set point value Access vernier 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 Set the new units and resume temperature display 9 5 Secondary M...

Страница 39: ...of temperatures around the setpoint This range of temperature is called the proportional band At the bot tom of the proportional band the heater output is 100 At the top of the pro portional band the heater output is 0 Thus as the bath temperature rises the heater power is reduced which consequently tends to lower the temperature back down In this way the temperature is maintained at a fairly cons...

Страница 40: ...band width setting may be determined by monitoring the stability with a high resolution thermometer or with the control ler percent output power display Narrow the proportional band width to the point at which the bath temperature begins to oscillate and then increase the 35 Controller Operation Figure 7 Bath temperature fluctuation at various proportional band settings Fluid Temperature Heater Se...

Страница 41: ...cutout device that will shut off power to the heater if the bath temperature exceeds a set value This protects the heater and bath materials from excessive temperatures and most impor tantly protects the bath fluids from being heated beyond the safe operating temperature preventing hazardous vaporization breakdown or ignition of the liquid The cutout temperature is programmable by the operator fro...

Страница 42: ... point press SET Accept cutout set point The next function is the configuration menu Press EXIT to resume display ing the bath temperature 9 9 Controller Configuration The controller has a number of configuration and operating options and calibra tion parameters which are programmable via the front panel These are ac cessed from the secondary menu after the cutout set point function by pressing SE...

Страница 43: ...ure at which the control probe out put would be 0 Normally this is set for 25 229 9 10 2 DG This probe parameter refers to the temperature span of the probe between 0 and 100 output Normally this is set for 186 974 9 11 Operating Parameters The operating parameters menu is indicated by PAr Operating parameters menu Press SET to enter the menu The operating parameters menu contains the cutout reset...

Страница 44: ...t BAUD rate 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 op eration and skip to the next parameter in the menu 9 12 2 Sample Period The sample period is the next parameter in the serial interface parameter menu The ...

Страница 45: ...mode parameter is indicated by dUPL Serial duplex mode parameter Press SET to access the mode setting dUP FULL Current duplex mode setting The mode may be changed using UP or DOWN and pressing SET dUP HALF New duplex mode setting 9 12 4 Linefeed The final parameter in the serial interface menu is the linefeed mode This pa rameter enables on or disables off transmission of a linefeed character LF A...

Страница 46: ... IEEE 488 interface address 9 14 Calibration Parameters The operator of the bath controller has access to a number of the bath calibra tion constants namely CTO H and L These values are set at the factory and must not be altered The correct values are important to the proper and safe op eration of the bath Access to these parameters is available to the user only so that in the event that the contr...

Страница 47: ... 14 2 H and L These parameters set the upper and lower set point limits of the bath DO NOT change the values of these parameters from the factory set values To do so may present danger of the bath exceeding its temperature range causing damage or fire 9 15 Command Summary A complete flowchart of controller operation is shown in Figure 6 This chart may be reproduced and used as a reference and oper...

Страница 48: ...e user may access any of the functions parameters and settings discussed in Section with the exception of the BAUD rate setting 10 1 1 Wiring The serial communications cable at taches to the bath through the D 9 connector at the back of the instru ment Figure 8 shows the pin out of this connector and suggested cable wiring 10 1 2 Setup Before operation the serial interface of the bath must first b...

Страница 49: ...urrent measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Ad just the period with UP or DOWN and then use SET to set the sample rate to the displayed value 10 1 2 3 Duplex Mode The next parameter is the duplex mode indicated with dUPL The duplex mode may be set to half dupl...

Страница 50: ... parameter 10 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 communication equipment by pressing UP or DOWN and then SET 10 2 2 IEEE 488 Operation Commands may now be sent via the IEEE 488 interface to read or set the tem per...

Страница 51: ...Menu Read proportional band setting pr op band pr pr 9 999 pr 1 59 Set proportional band to n pr op band n pr 0 061 Depends on Configuration Read cutout setting c utout c c 9999 x xxx c 100 C in Set cutout setting c utout n r eset Set cutout to n degrees c utout n c 100 Temperature Range Reset cutout now c utout r eset c r Read heater power duty cycle po wer po po 999 up to 100 po 1 Configuration ...

Страница 52: ...et serial duplex mode to half du plex h alf du h Set serial linefeed mode lf eed on of f ON or OFF Set serial linefeed mode to on lf eed on lf on Set serial linefeed mode to off lf eed of f lf of Calibration Menu Warning Changing the calibration values may change the instrument accuracy 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 R...

Страница 53: ... controlled with a the F1 command Setting the parameter to 0 sets the heater to LOW 250 W and set ting it to 1 sets the heater to HIGH 1000 W Sending F1 with no value will cause the controller to return a value showing what the heater setting is When the heater setting is changed a pop will be heard as the heater relay opens or closes 10 4 2 Cooling Control To control the refrigeration power with ...

Страница 54: ...functions for heating and cooling Table 5 shows the recommended control settings for each operating temperature range The ranges may need to be adjusted depending on the bath and its particular use 49 Digital Communication Interface Range Heater Refr Expans 10 to 15 C low on open 15 to 40 C low on closed 40 to 110 C low off closed Table 5 Temperature Range Control Functions Function Command 0 1 He...

Страница 55: ...tures then the bath may achieve an accuracy of say 0 2 C over the range 20 to 80 C Choosing 30 C and 70 C may allow the bath to have a better accuracy of maybe 0 05 C over the range 30 to 70 C but outside that range the accuracy may be only 0 5 C 11 2 Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration...

Страница 56: ...be computed as 25 831 and 0028720 respectively Program the new values D0 and DG into the con troller The new constants will be used the next time the bath temperature is set 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 fur ther improve the accuracy 11 4 Calibration Example The bath is to b...

Страница 57: ...C tH 75 00 C measured t 74 901 C Compute errors errL 24 869 25 00 C 0 131 C errH 74 901 75 00 C 0 099 C Compute C0 D0 0131 75 0 25 229 0 099 25 0 25 22 9 75 0 25 0 25 229 25392 Compute CG DG 0 099 0131 75 0 25 0 1 0 0028530 0 0028548 Figure 9 Sample calibration computations ...

Страница 58: ...plication Heat transfer medium lifetime is dependent upon the type of medium and the environment The fluid should be checked at least every month for the first year and regularly thereafter This fluid check provides a baseline for knowledge of bath operation with clean usable fluid Once some fluids have become compromised the break down can occur rapidly Particular attention should be paid to the ...

Страница 59: ...he display flashes cut out and the temperature is decreasing CAUTION When checking the over temperature cut out be sure that the temperature limits of the bath fluid are not exceeded Exceeding the tem perature limits of the bath fluid could cause harm to the operator lab and instrument 12 1 Draining the Bath The drain is located on the back of the bath See Figure 4 Back Panel Locate the drain plug...

Страница 60: ...n is automatic upon correction of the fault condition and after a delay cycle of about 10 minutes High and low voltage protection limits at 230 VAC Voltage Cut out 12 5 203 257 VAC Voltage Cut in 7 5 213 247 VAC See the Caution in the front of this manual for additional information The heater indicator LED stays red but the temper ature does not increase If the display does not show cut out and sh...

Страница 61: ...n con stants must be re programmed The values can be found on the Report of Cali bration that was shipped with the instrument The display flashes CUT OUT alternately with an incorrect process temperature Low battery A problem could exist with the memory back up battery If the bat tery voltage is insufficient to maintain the memory data may become scrambled causing problems A nearby large static di...

Страница 62: ...set too narrow the bath will oscillate causing poor stability In this case increase the width of the proportional band If the proportional band setting is too wide the long term stability of the bath is affected In this case decrease the width of the band Refer to section 9 7 Bath fluid is too thick Make sure that the bath fluid used is less than 50 centi Stokes 10 is ideal at the temperature at w...

Страница 63: ... controller 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 Re...

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