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Table of Contents
Summary of Contents for Hart Scientific 7011
- Page 1 Model 7011 Temperature Bath User Manual Rev. 881801...
- Page 2 © Copyright,1995 All rights reserved Hart Scientific 799 E Utah Valley Drive American Fork, Utah 84003 Telephone (801) 763-1600 • Fax (801) 763-1010 http://www.hartscientific.com...
- Page 3 WARNING To ensure the safety of operating personnel, and to avoid damage to this unit: DO NOT operate this unit without a properly grounded, properly polarized power cord. DO NOT connect this unit to a non-grounded, non-polarized outlet. DO use a ground fault interrupt device. WARNING EXTREMELY COLD TEMPERATURES PRESENT in this equipment.
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Page 4: Table Of Contents
Table of Contents Introduction..... . 9 Specifications and Environmental Conditions . . 11 2.1 Specifications ..... . 11 2.2 Environmental Conditions . - Page 5 8.1.9 Cost ....... 31 8.1.10 Commonly Used Fluids ..... 31 8.1.10.1 Water .
- Page 6 12.2 Charging......55 13 Troubleshooting ....57 13.1 Troubleshooting .
- Page 7 Figures and Tables Figure 1 Bath Assembly ......9 Table 1 Specifications ......11 Figure 2 Front Panel .
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Page 8: Introduction
User interface is provided by the 8-digit LED display and four key-switches. The tank for the 7011 is stainless steel and holds 25 liters. The 7011 uses a refrigeration system that is CFC free. -
Page 9: Specifications And Environmental Conditions
115 VAC (±10%), 60 Hz, 13.2 amps (230 VAC (±10%), 50 Hz 6.8 amps, option available) Volume 6.6 gallons (25 liters) Size 21.5”H x 27” W x 15.5”D (546 x 686 x 394 mm) Weight 125 lbs (56.7 kg) 7011 Manual Rev. 881801... -
Page 10: Warranty
Warranty Hart Scientific, Inc. (Hart) warrants this product to be free from defects in ma- terial and workmanship under normal use and service for a period as stated in our current product catalog from the date of shipment. -
Page 11: Safety Guidelines
If the fuse blows a second time, it is likely caused by failure of a component part. If this occurs, contact Hart Scientific Customer Service. Always re- place the fuse with one of the same rating, voltage, and type. Never re- place the fuse with one of a higher current rating. -
Page 12: Quick Start
This section gives a brief summary of the steps required to set up and operate the 7011 bath. This should be used as a general overview and reference and not as a substitute for the remainder of the manual. Please read Sections through carefully before operating the bath. -
Page 13: Power
Press SET to accept the new value and display the vernier value. The bath be- gins 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 will be displayed again. Manual Rev. 881801 Hart Scientific... - Page 14 If operating the bath below 45 °C set the COOLING power switch to ON. The cooling temperature may require adjustment to provide the proper amount of cooling. See Section 8.5. To obtain optimum control stability adjust the proportional band as discussed in Section 9.7. 7011 Manual Rev. 881801...
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Page 15: Installation
Installation Bath Environment The Model 7011 Bath is a precision instrument which should be located in an appropriate environment. The location should be free of drafts, extreme tem- peratures and temperature changes, dirt, etc. The surface where the bath is placed must be level. -
Page 16: Probe
Normally this will be 115 VAC (±10%), 60 Hz, 13.2 A [230 VAC (±10%), 50 Hz, 6.8 A]. Be sure the stirring motor power cord is plugged into the “STIRRER” socket at the back of the bath. Manual Rev. 881801 Hart Scientific... -
Page 17: Bath Use
However, stem effect from different types of probes is not to- tally eliminated. Even though all baths have horizontal and vertical gradients, these gradients are minimized inside the bath work area. Nevertheless, probes 7011 Manual Rev. 881801... -
Page 18: Calibration Of Multiple Probes
Fully loading the bath with probes increases the time required for the tempera- ture to stabilize after inserting the probes. Using the reference probe as the guide, be sure that the temperature has stabilized before starting the calibra- tion. Manual Rev. 881801 Hart Scientific... -
Page 19: Parts And Controls
When the indicator is red the heater is on, and when it is green the heater is off and the bath is cooling. HEATING COOLING POWER HIGH SET DOWN EXIT HART High Precision Bath SCIENTIFIC Figure 2 Front Panel 7011 Manual Rev. 881801... -
Page 20: Side Panel
The COOLING TEMPERATURE regulating valve is used to adjust the pressure which determines the temperauture the refrigerant evaporates. Refer to the lable below the gauge for approximate psi vs bath temperature settings. The table from the label is reproduced below. Manual Rev. 881801 Hart Scientific... -
Page 21: Back Panel
Some oils are more easily drained at a higher temperature. Extreme caution must be maintained to prevent harm to the user or the surrounding environment. Insulate the container from the floor or other objects that may be damaged by high temperatures as required. 7011 Manual Rev. 881801... -
Page 22: Lid
The rectangular access hole, on the standard lid, may be used to insert the users device to be thermostated. To obtain specified control levels this hole must be covered to prevent thermal disturbance to the bath. Covers may be purchased separately from Hart Scientific. Manual Rev. 881801 Hart Scientific... -
Page 23: Figure 5 Lid Options
“STIRRER”. The probe hole is for the temperature controller probe. The probe must be in this hole for the bath to operate. Standard Lid Optional Pump Lid Figure 5 Lid Options 7011 Manual Rev. 881801... -
Page 24: General Operation
8 General Operation General Operation Bath Fluid Many fluids will work with 7011 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, electri- cal conductivity, fluid lifetime, safety, and cost. -
Page 25: Thermal Conductivity
The closed cup represents the contained vapors inside the tank and the open cup represents the vapors escaping the tank. Ox- ygen and an ignition source will be less available inside the tank. Manual Rev. 881801 Hart Scientific... -
Page 26: Fluid Lifetime
Mineral oil is relatively inexpensive. At lower temperatures min- eral oil is quite viscous and control may be poor. At higher temperatures vapor emission becomes significant. The vapors may be dangerous and use of a 7011 Manual Rev. 881801... -
Page 27: Fluid Characteristics Charts
Specifications may change and sources sometimes offer differing information. Hart Scientific can- not be liable for any personal injury or damage to equipment, product or facili- ties resulting from the use of these fluids. - Page 28 *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. 7011 Manual Rev. 881801...
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Page 29: Figure 6 Chart Of Various Bath Fluids And Their Properties
FL - Flash Point Black area represents liquid range with excessive viscosity. FR - Freeze Point PP - Pour Point Range over which a fume hood is recommended. Figure 6 Chart of various bath fluids and their properties Manual Rev. 881801 Hart Scientific... -
Page 30: Stirring
(full CCW) for temperature slewing and oper- ation. If during operation the front panel meter indicates excessive cooling, this valve is closed partially (turn CW) until the percentage of heating to cooling is 7011 Manual Rev. 881801... -
Page 31: Temperature Controller
0°C. Readjust higher or lower as required after set temperature is reached. Temperature Controller The bath temperature is controlled by Hart Scientific’s unique hybrid digital/an- alog 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. -
Page 32: Controller Operation
“cut-out” until the user resets the cut-out. To access the reset cut-out function press the “SET” button. Access cut-out reset function The display will indicate the reset function. rESEt ? Cut-out reset function Press “SET” once more to reset the cut-out. 7011 Manual Rev. 881801... -
Page 33: Figure 7 Controller Flowchart
Adjust CTO Adjust CTO Adjust D0 Reset Mode SET/EXIT SET/EXIT SET/EXIT SET/EXIT EXIT EXIT EXIT Adjust H Adjust H Adjust DG SET/EXIT SET/EXIT SET/EXIT EXIT EXIT Adjust L Adjust L SET/EXIT SET/EXIT Figure 7 Controller Flowchart Manual Rev. 881801 Hart Scientific... -
Page 34: Temperature Set-Point
Press “SET” to accept the new selection and access the set-point value. Accept selected set-point memory 9.3.2 Set-point Value The set-point value may be adjusted after selecting the set-point memory and pressing “SET”. The set-point value is displayed with the units, C or F, at the left. 7011 Manual Rev. 881801... -
Page 35: Set-Point Vernier
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. 25.00 C Bath temperature Manual Rev. 881801 Hart Scientific... -
Page 36: Secondary Menu
Monitoring the percent heater power will let the user know how stable the bath temperature is. With good control stability the percent heating power should not fluctuate more than ±1% within one min- ute. 7011 Manual Rev. 881801... -
Page 37: Proportional Band
(viscosity, specific heat, thermal conductivity), heater power setting, operating temperature, and stirring. Thus Proportional Band too Narrow Proportional Band too Wide Optimum Proportional Band Figure 8 Bath temperature fluctuation at various proportional band settings Manual Rev. 881801 Hart Scientific... - Page 38 Water 60.0°C 0.04°C ±0.001°C Eth-Gly 50% 35.0°C 0.05°C ±0.0005°C Eth-Gly 50% 60.0°C 0.05°C ±0.001°C Eth-Gly 50% 100.0°C High 0.4°C ±0.007°C 35.0°C 0.1°C ±0.003°C 60.0°C 0.2°C ±0.002°C 100°C 0.2°C ±0.003°C Table 3 Proportional Band — Fluid Table 7011 Manual Rev. 881801...
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Page 39: Cut-Out
Access proportional band Pb=0.101C Proportional band setting Access cut-out set-point CO= 110C Cut-out set-point To change the cut-out set-point press “UP” or “DOWN”. CO= 75C New cut-out set-point To accept the new cut-out set-point press “SET”. Manual Rev. 881801 Hart Scientific... -
Page 40: Controller Configuration
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, Operating parameters menu 7011 Manual Rev. 881801... -
Page 41: Cut-Out Reset Mode
9.12.1 CTO Parameter CTO sets the calibration of the over-temperature cut-out. This is not adjustable by software but is adjusted with an internal potentiometer. For the 7011 bath this parameter should read between 110 and 130. Manual Rev. 881801 Hart Scientific... -
Page 42: 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. 7011 Manual Rev. 881801... -
Page 43: Bath Calibration
The user should keep a record of these values in case they may need to be re- stored in the future. The new values DO′ and DG′ are computed by entering 7011 Manual Rev. 881801... -
Page 44: Figure 9 Sample Calibration Computations
Compute D − − − 0131 ) ( . 0 099 DG ′ = 1 186 974 186 854 − 75 0 25 0 Figure 9 Sample calibration computations Manual Rev. 881801 Hart Scientific... -
Page 45: Calibration Example
DO and DG are -25.229 and 186.974 respectively. The calibration points are chosen to be 25.00 and 75.00°C. The measured bath temperatures are 24.869 and 74.901°C respectively. Refer to Figure for applying equations to the example data and computing the new probe constants. 7011 Manual Rev. 881801... -
Page 46: Maintenance
Hart Scientific Customer Service for more information. • Before using any cleaning or decontamination method except those rec- ommended by Hart, users should check with Hart Scientific Customer Ser- vice to be sure that the proposed method will not damage the equipment. •... -
Page 47: Draining The Bath
Heat proof containers and appropri- ate safety equipment such as face shields, gloves and body covering are recommended. WARNING Extreme danger of BURNS and FIRE. Use safety equipment, use proper equipment and have fire safety equipment standing by. Manual Rev. 881801 Hart Scientific... -
Page 48: Charging Instructions
R-134a slowly through the low pressure side until the sight glass located at the back of the unit is full. This sight glass should begin to show gas bubbles be- tween 25 and 30 psi, but should be full below that pressure. 7011 Manual Rev. 881801... -
Page 49: Troubleshooting
“LOW”, or switching off the cooling altogether. One or more burned out heaters or blown heater fuses may also cause this problem. If the heaters seem to be burned out, contact Hart Scientific Cus- tomer Service for assistance. -
Page 50: The Display Flashes "Cut-Out" And An Incorrect Process Temperature
2 on the probe connector and 0.2 to 2.0 ohms between pins 3 and 4. The resistance should read from 100 to 300 ohms between pins 1 and 4 depending on the temperature. If the probe is defective, contact Hart Scientific Customer Service for assistance. -
Page 51: The Controller Shows That The Output Power Is Steady But The Process Temperature Is Unstable
• Check that the control probe has not been struck, bent, or damaged. If the cause of the problem remains unknown, contact Hart Scientific Customer Service for assistance. 13.1.6 The controller shows that the output power is steady but the... -
Page 52: Wiring Diagram
13 Troubleshooting 13.2 Wiring Diagram Figure 10 Wiring Diagram Manual Rev. 881801 Hart Scientific...
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