Fluke 7080 User manual

7080/7081
Calibration Bath
User’s Guide
Rev. 5B2303
Hart Scientific

Rev. 5B2303
Fluke Corporation, Hart Scientific Division
799 E. Utah Valley Drive • American Fork, UT 84003-9775 • USA
Phone: [phone] • Telefax: +1.801.763.1010
E-mail: [email protected]
www.hartscientific.com
Subject to change without notice. • Copyright © 2005 • Printed in USA

Table of Contents
1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.1 WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.2 CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Authorized Service Centers. . . . . . . . . . . . . . . . . . . . . . 5
2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Specifications and Environmental Conditions . . . . . . . . . 9
3.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Semi-Hermetic Compressor . . . . . . . . . . . . . . . . . . . . . 11
4.3 Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5 Setting the Temperature . . . . . . . . . . . . . . . . . . . . . . . 13
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Bath Environment . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2 “Dry-out” Period . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Bath Preparation and Filling . . . . . . . . . . . . . . . . . . . . 15
5.4 Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.5 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 Bath Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 Comparison Calibration . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Calibration of Multiple Probes . . . . . . . . . . . . . . . . . . . 20
7 Parts and Controls . . . . . . . . . . . . . . . . . . . . . . . . 21
7.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.2 Refrigeration Controls. . . . . . . . . . . . . . . . . . . . . . . . 22
i

7.3 Back Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.4 Lid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8 General Operation . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1 Bath Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.1 Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.2 Viscosity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.3 Specific Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1.4 Thermal Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1.5 Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1.6 Electrical Resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1.7 Fluid Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1.8 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1.9 Cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1.10 Commonly Used Fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1.10.1 Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1.10.2 Ethylene Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1.10.3 Methanol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1.10.4 Halocarbon 0.8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.10.5 Mineral Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.10.6 Silicone oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.11 Fluid Characteristics Charts. . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1.11.1 Limitations and Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1.11.2 About the Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.2 Stirring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.3 Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.4 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.5 Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.6 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.7 Temperature Controller . . . . . . . . . . . . . . . . . . . . . . . 35
9 Controller Operation . . . . . . . . . . . . . . . . . . . . . . . 37
9.1 Bath Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.2 Reset Cut-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.3 Temperature Set-point . . . . . . . . . . . . . . . . . . . . . . . . 39
9.3.1 Programmable Set-points . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.3.2 Set-point Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.3.3 Set-point Vernier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.4 Temperature Scale Units . . . . . . . . . . . . . . . . . . . . . . 41
9.5 Secondary Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9.6 Heater Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9.7 Proportional Band . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9.8 Cut-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.9 Controller Configuration . . . . . . . . . . . . . . . . . . . . . . 46
9.10 Probe Parameters Menu . . . . . . . . . . . . . . . . . . . . . . . 46
ii

9.10.1 R0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
9.10.2 ALPHA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.11 Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . 47
9.11.1 Cut-out Reset Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.12 Serial Interface Parameters . . . . . . . . . . . . . . . . . . . . . 47
9.12.1 BAUD Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.12.2 Sample Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.12.3 Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.12.4 Linefeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.13 IEEE-488 Parameters Menu. . . . . . . . . . . . . . . . . . . . . 49
9.13.1 IEEE-488 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.14 Calibration Parameters . . . . . . . . . . . . . . . . . . . . . . . 50
9.14.1 CTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.14.2 BO and BG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.14.3 H and L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
10 Digital Communication Interface . . . . . . . . . . . . . . . . 51
10.1 Serial Communications . . . . . . . . . . . . . . . . . . . . . . . 51
10.1.1 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
10.1.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
10.1.2.1 BAUD Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
10.1.2.2 Sample Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
10.1.2.3 Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
10.1.2.4 Linefeed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
10.1.3 Serial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
10.2 IEEE-488 Communication (optional) . . . . . . . . . . . . . . . . 53
10.2.1 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
10.2.1.1 IEEE-488 Interface Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
10.2.2 IEEE-488 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
10.3 Interface Commands . . . . . . . . . . . . . . . . . . . . . . . . 54
10.4 Power Control Functions . . . . . . . . . . . . . . . . . . . . . . 54
10.4.1 Heater Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
10.4.2 Cooling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . 59
11.1 Calibration Points . . . . . . . . . . . . . . . . . . . . . . . . . . 59
11.2 Measuring the Set-point Error. . . . . . . . . . . . . . . . . . . . 59
11.3 Computing R0 and ALPHA . . . . . . . . . . . . . . . . . . . . . 59
11.4 Calibration Example. . . . . . . . . . . . . . . . . . . . . . . . . 60
12 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
12.1 Draining the Bath . . . . . . . . . . . . . . . . . . . . . . . . . . 64
13 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . 65
13.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
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iv
Figures
Figure 1 Bath Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2 Semi-hermetic Compressor . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 3 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 4 Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 5 Lid Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 6 Chart of Various Bath Fluids . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 7 Controller Operation Flowchart . . . . . . . . . . . . . . . . . . . . . 38
Figure 8 Bath Temperature Fluctuation at Various Proportional Band Settings . . 43
Figure 9 Serial Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 10 Sample Calibration Computations . . . . . . . . . . . . . . . . . . . . 61

13.2 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
13.2.1 EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
13.2.1.1 Emission Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
13.2.2 Low Voltage Directive (Safety) . . . . . . . . . . . . . . . . . . . . . . . . . 69
v

vi
Tables
Table 1 International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1
Table 2 Temperature Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 3 Table of Bath Fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 4 Proportional Band — Fluid Table . . . . . . . . . . . . . . . . . . . . 44
Table 5 Interface Command Summary . . . . . . . . . . . . . . . . . . . . . . 55
Table 5 Interface Command Summary Continued . . . . . . . . . . . . . . . . 56
Table 6 Serial Power Control Functions . . . . . . . . . . . . . . . . . . . . . 57
Table 7 Temperature Range Control Functions. . . . . . . . . . . . . . . . . . 58

1 Before You Start
1.1 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.
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
1 Before You Start
Symbols Used
Table 1 International Electrical Symbols

Symbol Description
Canadian Standards Association
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 re-
fers to the level of Impulse Withstand Voltage protection provided. Equipment of
OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from
the fixed installation. Examples include household, office, and laboratory appliances.
C-TIC Australian EMC Mark
The European Waste Electrical and Electronic Equipment (WEEE) Directive
(2002/96/EC) mark.
1.2 Safety Information
Use this instrument only as specified in this manual. Otherwise, the protection
provided by the instrument may be impaired.
The following definitions apply 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.
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 user’s guide.
•DO NOT overfill the bath. Overflowing extremely cold or hot fluid may
be harmful to the operator. See Section 5.3, Bath Preparation and Filling,
for specific instructions.
•Follow all safety guidelines listed in the user’s manual.
•Calibration Equipment should only be used by Trained Personnel.
•If this equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
•Before initial use, or after transport, or after storage in humid or semi-hu-
mid environments, or anytime the instrument has not been energized for
more than 10 days, the instrument needs to be energized for a "dry-out"
7080/7081 Calibration Bath
User’s Guide
2

period of 2 hours before it can be assumed to meet all of the safety re-
quirements 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 apply-
ing power such as storage in a low humidity temperature chamber operat-
ing at 50°C for 4 hours or more.
•Overhead clearance is required. Do not place the instrument under a cabi-
net 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 op-
timum 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 precau-
tions.
•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 a 230V AC electric outlet of the appropriate frequency. 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.
•Always replace the power cord with an approved cord of the correct rat-
ing and type. If you have questions, contact a Hart Scientific Authorized
Service Center (see Section 1.3).
•High voltage is used in the operation of this equipment. Severe injury or
death may result if personnel fail to observe the safety precautions. Before
working inside the equipment, turn off the power and disconnect the
power cord.
3
1 Before You Start
Safety Information

BATH FLUIDS
•Fluids used in this bath may produce noxious or toxic fumes under certain
circumstances. Consult the fluid manufacturer’s MSDS (Material Safety
Data Sheet). Proper ventilation and safety precautions must be observed.
•The instrument is equipped with a soft cutout (user settable firmware) and
a hard cutout (set at the factory). Check the flash point, boiling point, or
other fluid characteristic applicable to the circumstances of the bath oper-
ation. Ensure that the soft cutout is adjusted to the fluid characteristics of
the application. As a guideline, the soft cutout should be set 10°C to 15°C
below the flash point of the bath fluid. See Section 8.1, Heat Transfer
Fluid, for specific information on bath fluids and Section , Cutout.
1.2.2 CAUTIONS
To avoid possible damage to the instrument, follow these guidelines.
•Always operate this instrument at room temperature between 41°F and
122°F (5°C to 50°C). Allow sufficient air circulation by leaving at least 6
inches (15 cm) of clearance around the instrument.
•When filling the tank, ensure the immersion coils are completely covered.
•DO NOT overfill the bath. Overflowing fluid may damage 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 proper operation of the bath.
•The refrigeration may be damaged or the lifetime shortened if the
set-point temperature is set above 60°C for more than one hour with the
refrigeration manually on. Ensure that the refrigeration is off when the
bath is used above 60°C.
•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 pa-
rameters.
•DO NOT operate this instrument in an excessively wet, oily, dusty, or
dirty environment.
•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 and any thermometer probes used with it are sensitive in-
struments that can be easily damaged. Always handle these devices with
care. Do not allow them to be dropped, struck, stressed, or overheated.
7080/7081 Calibration Bath
User’s Guide
4

COLD BATHS
•Refrigerated baths require that the condensing coil be cleaned periodi-
cally. Accumulation of dust and dirt on the condenser will result in pre-
mature failure of the compressor.
•This bath has been equipped with a brownout and over voltage protection
device as a safety feature to protect the system components.
•Mode of Operation: This bath needs to be plugged into the line voltage
for at least 2 minutes before operation. This is only necessary for the first
time the bath is energized or when it is moved from one location to an-
other. Turning the bath ON or OFF does not trigger the delay.
•If a High/Low voltage condition exists 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 Cut In: ±7.5% (213 - 247 VAC)
1.3 Authorized Service Centers
Please contact one of the following authorized Service Centers to coordinate
service on your Hart product:
Fluke Corporation, Hart Scientific Division
799 E. Utah Valley Drive
American Fork, UT 84003-9775
USA
Phone: [phone]
Telefax: +1.801.763.1010
E-mail: [email protected]
Fluke Nederland B.V.
Customer Support Services
Science Park Eindhoven 5108
5692 EC Son
NETHERLANDS
5
1 Before You Start
Authorized Service Centers

Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
Fluke Int'l Corporation
Service Center - Instrimpex
Room 2301 Sciteck Tower
22 Jianguomenwai Dajie
Chao Yang District
Beijing 100004, PRC
CHINA
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
Fluke South East Asia Pte Ltd.
Fluke ASEAN Regional Office
Service Center
60 Alexandra Terrace #03-16
The Comtech (Lobby D)
118502
SINGAPORE
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
When contacting these Service Centers for support, please have the following
information available:
•Model Number
•Serial Number
•Voltage
•Complete description of the problem
7080/7081 Calibration Bath
User’s Guide
6

2 Introduction
The Hart Scientific Model 7080/7081 is a very precise constant temperature
bath. The bath is specially designed for low temperature applications. An inno-
vative state of the art solid-state temperature controller has been incorporated
which maintains the bath temperature with extreme stability. The controller
uses a microprocessor to execute the many operating functions.
7
2 Introduction
Figure 1 Bath Assembly

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 7080/7081 is stainless steel. The 7080 holds 25 liters and the
7081 holds 44 liters. There are two lids available: the standard lid with a rectan-
gular access hole and an optional lid with a recirculation pump (see Figure 5).
7080/7081 Calibration Bath
User’s Guide
8

3 Specifications and Environmental
Conditions
3.1 Specifications
7080 7081
Range -80°C to 110°C
Stability ±0.0025°C at –80°C (methanol)
±0.0015°C at 0°C (methanol)
±0.0015°C at 25°C (water)
±0.003°C at 100°C (oil)
Uniformity ±0.007°C at –80°C (methanol)
±0.005°C at 0°C (methanol)
±0.003°C at 25°C (water)
±0.005°C at 100°C (oil)
Temperature Setting Digital display with push-button data entry
Set-Point Resolution 0.01°C; high-resolution mode, 0.00007°C
Display Resolution 0.01°C
Digital Setting Accuracy ±1°C
Digital Setting Repeatability ±0.01°C
Heaters 500 and 1000 Watts
Access Opening
(call for custom sizes)
5” x 10”
(127 x 254 mm)
7.25” x 12.75”
(184 x 324 mm)
Depth 12” (305 mm) 13.25” (337 mm)
Wetted Parts 304 stainless steel
Power 230 VAC (±10%), 50 or 60 Hz, 13 A, single phase, 2900 W, specify fre-
quency
Volume 7.2 gallons (27 liters) 11.2 gallons (42 liters)
Weight 350 lb. (159 kg)
Size 46” H x 30.5” W x 19” D (1168 x 775 x 483 mm)
Automation Package Interface-it software and an RS-232 computer interface are available
for setting the bath temperature via an external computer. For
IEEE-488, add 2001-IEEE to the automation package.
Safety OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per
IEC1010-1
3.2 Environmental Conditions
Although the instrument has been designed for optimum durability and trou-
ble-free operation, it must be handled with care. The instrument should not be
operated in an excessively dusty or dirty environment. Maintenance and clean-
ing recommendations can be found in the Maintenance Section of this manual.
The instrument operates safely under the following conditions:
9
3 Specifications and Environmental Conditions
Specifications

•temperature range: 5 - 50°C (41 - 122°F)
•ambient relative humidity: maximum 80% 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
3.3 Warranty
Fluke Corporation, Hart Scientific Division (Hart) warrants this product to be
free from defects in material and workmanship under normal use and service
for a period as stated in our current product catalog from the date of shipment.
This warranty extends only to the original purchaser and shall not apply to any
product which, in Hart’s sole opinion, has been subject to misuse, alteration,
abuse or abnormal conditions of operation or handling.
Software is warranted to operate in accordance with its programmed instruc-
tions on appropriate Hart products. It is not warranted to be error free.
Hart’s obligation under this warranty is limited to repair or replacement of a
product which is returned to Hart within the warranty period and is determined,
upon examination by Hart, to be defective. If Hart determines that the defect or
malfunction has been caused by misuse, alteration, abuse or abnormal condi-
tions or operation or handling, Hart will repair the product and bill the pur-
chaser for the reasonable cost of repair.
To exercise this warranty, the purchaser must forward the product after calling
or writing an Authorized Service Center for authorization (see Section 1.3).
The Service Centers assume NO risk for in-transit damage.
THE FOREGOING WARRANTY IS PURCHASER’S SOLE AND EXCLU-
SIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EX-
PRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY
IMPLIED WARRANTY OR MERCHANTABILITY, OR FITNESS FOR ANY
PARTICULAR PURPOSE OR USE. HART SHALL NOT BE LIABLE FOR
ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAM-
AGES OR LOSS WHETHER IN CONTRACT, TORT, OR OTHERWISE.
7080/7081 Calibration Bath
User’s Guide
10

4 Quick Start
CAUTION: Before placing the bath in service READ SECTION 6 ENTI-
TLED BATH USE.
Incorrect handling can damage the bath and void the warranty.This chapter
gives a brief summary of the steps required to set up and operate the 7080 or
7081 bath. This should be used as a general overview and reference and not as
a substitute for the remainder of the manual. Please read Sections5 through8
carefully before operating the bath.
4.1 Unpacking
Unpack the bath carefully and inspect it for any damage that may have oc-
curred during shipment. If there is shipping damage, notify the carrier
immediately.
Verify that all components are present:
•7080/7081 Bath
•Access Hole Cover
•Controller Probe
•Manual
•Drain Elbow
•Report of Test
•Fill Hole Cover
•9930 Interface-it Software and User's Guide (optional)
If you are missing any item, please contact an Authorized Service Center (see
Section 1.3).
4.2 Semi-Hermetic Compressor
The semi-hermetic compressor(s), located below the bath, have had their
mounting hardware tightened down to avoid damage during shipment. In addi-
tion, shipping foam has been placed between some of the refrigeration lines for
the same purpose. Upon installation, please remove all pieces of the shipping
foam and adjust the compressor’s hardware for proper vibration absorption as
illustrated below in Figure 2.
4.3 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 power. Consult Section
11
4 Quick Start
Unpacking

for detailed instructions for proper installation of the bath. Be sure to place the
bath in a safe, clean and level location.
Fill the bath tank with an appropriate liquid. For operation at moderate bath
temperatures, clean distilled water works well. Carefully pour the fluid into the
bath tank through the large rectangular access hole above the tank avoiding
spilling any fluid. The fluid must not exceed a height of 1/2 inch below the bath
lid.
The control probe MUST BE inserted through the lid into the bath and plugged
into the socket at the back of the bath. DO NOT operate the bath without the
control probe properly installed.
4.4 Power
Plug the bath power cord into a mains outlet of the proper voltage, frequency,
and current capability: 230 VAC (±10%), 60 Hz, 15 A. 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
reach the previously programmed temperature setpoint. The front panel LED
display will indicate the actual bath temperature.
7080/7081 Calibration Bath
User’s Guide
12
Figure 2 Semi-hermetic Compressor