Fluke 7108 User manual

PN 3729343
January 2014
© 2014 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
7108
Calibration Bath
User's Guide
Via Acquanera, 29 22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
[e-mail] www.calpower.it

LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and
service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and
services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance
with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.
To obtain warranty service, contact your 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 caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other
provision.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/99
To register your product online, visit register.fluke.com

i
Table of Contents
Chapter Title Page
1 Before You Start.................................................................................. 1-1
1.1 Introduction................................................................................1-1
1.2 Symbols Used............................................................................1-1
1.3 Safety Information......................................................................1-2
1.3.1 WARNINGS...........................................................................1-2
1.3.2 CAUTIONS............................................................................1-4
1.4 Authorized Service Centers....................................................... 1-6
2 Specifications and Environmental Conditions................................. 2-1
2.1 Specifications.............................................................................2-1
2.2 Environmental Conditions.......................................................... 2-2
2.3 Warranty.................................................................................... 2-2
3 Quick Start ........................................................................................... 3-1
3.1 Unpacking.................................................................................. 3-1
3.2 Set Up........................................................................................ 3-1
3.3 Power ........................................................................................3-2
3.4 Setting the Temperature............................................................ 3-2
4 Installation ........................................................................................... 4-1
4.1 Bath Environment...................................................................... 4-1
4.2 “Dry-out” Period......................................................................... 4-1
4.3 Bath Preparation and Filling ...................................................... 4-2
4.4 Probe......................................................................................... 4-2
4.5 Power ........................................................................................4-2
5 Bath Use............................................................................................... 5-1
5.1 General......................................................................................5-1
5.2 Comparison Calibration............................................................. 5-2
5.3 Calibration of Multiple Probes.................................................... 5-2

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User's Guide
ii
6 Parts and Controls .............................................................................. 6-1
6.1 Front Control Panel....................................................................6-1
6.2 Back Panel ....................................................................................6-2
7 General Operation............................................................................... 7-1
7.1 Switching to 230 V Operation.................................................... 7-1
7.2 Bath Fluid...................................................................................7-1
7.2.1 Temperature Range...............................................................7-1
7.2.2 Viscosity.................................................................................7-2
7.2.3 Specific Heat.......................................................................... 7-2
7.2.4 Thermal Conductivity.............................................................7-2
7.2.5 Thermal Expansion................................................................7-2
7.2.6 Electrical Resistivity...............................................................7-2
7.2.7 Fluid Lifetime .........................................................................7-2
7.2.8 Safety..................................................................................... 7-3
7.2.9 Cost .......................................................................................7-3
7.2.10 Commonly Used Fluids..........................................................7-3
7.2.10.1 Water.................................................................................7-3
7.2.10.2 Ethylene Glycol.................................................................. 7-4
7.2.10.3 Methanol............................................................................7-4
7.2.10.4 Mineral Oil..........................................................................7-4
7.2.10.5 Silicone Oils.......................................................................7-4
7.2.11 Fluid Characteristics Charts............................................... 7-4
7.2.11.2 About the Graph ................................................................7-5
7.3 Stirring .......................................................................................7-7
7.4 Power ........................................................................................7-8
7.5 Heater/Cooling........................................................................... 7-8
7.6 Fluid Drain .................................................................................7-8
7.7 Temperature Controller.............................................................. 7-8
8 Controller Operation ........................................................................... 8-1
8.1 Bath Temperature...................................................................... 8-1
8.2 Temperature Set-point............................................................... 8-1
8.2.1 Programmable Set-points...................................................... 8-1
8.2.2 Set-point Value...................................................................... 8-3
8.2.3 Set-point Vernier....................................................................8-3
8.3 Temperature Scale Units........................................................... 8-4
8.4 Secondary Menu........................................................................ 8-5
8.5 Thermal Electric Devices (TEDs)............................................... 8-5
8.6 Proportional Band......................................................................8-6
8.7 Controller Configuration............................................................. 8-7
8.8 Probe Parameters......................................................................8-8
8.8.1 D0..........................................................................................8-8
8.8.2 Dg..........................................................................................8-8
8.9 Serial Interface Parameters....................................................... 8-8
8.9.1 Baud Rate..............................................................................8-8
8.9.2 Sample Period....................................................................... 8-9
8.9.3 Duplex Mode..........................................................................8-9
8.9.4 Linefeed................................................................................. 8-10
8.10 IEEE-488 Parameters................................................................8-10
8.10.1 IEEE-488 Address................................................................. 8-10

Contents (continued)
iii
9 Digital Communication Interface ....................................................... 9-1
9.1 Serial Communications..............................................................9-1
9.1.1 Wiring..................................................................................... 9-1
9.1.2 Setup .....................................................................................9-1
9.1.2.1 Baud rate...........................................................................9-2
9.1.2.2 Sample Period................................................................... 9-2
9.1.2.3 Duplex Mode...................................................................... 9-2
9.1.2.4 Linefeed.............................................................................9-2
9.1.3 Serial Operation.....................................................................9-2
9.2 IEEE-488 Communication ......................................................... 9-2
9.2.1 Setup .....................................................................................9-3
9.2.1.1 IEEE-488 Interface Address .............................................. 9-3
9.2.2 IEEE-488 Operation...............................................................9-3
9.3 Interface Commands .................................................................9-4
10 Calibration Procedure......................................................................... 10-1
11 Maintenance......................................................................................... 11-1
11.1 Draining the Bath.......................................................................11-2
12 Troubleshooting.................................................................................. 12-1
12.1 Troubleshooting.........................................................................12-1
12.1.1 Master Reset Sequence........................................................ 12-2
12.2 CE Comments ...........................................................................12-3
12.2.1 EMC Directive........................................................................ 12-3
12.2.2 Directive (Safety)................................................................... 12-3

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User's Guide
iv

v
List of Tables
Table Title Page
1. International Electrical Symbols................................................................ 1-1
2. Specifications............................................................................................ 2-1
3. Table of various bath fluids and their properties ....................................... 7-7
4. Proportional Band — Fluid Table.............................................................. 8-7
5. Interface Command Summary .................................................................. 9-5
6. Interface Command Summary continued.................................................. 9-5

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User's Guide
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vii
List of Figures
Figure Title Page
1. Front Panel................................................................................................ 6-2
2. Back Panel................................................................................................ 6-4
3. Chart of various bath fluids and their properties........................................ 7-6
4. Controller Operation Flowchart ................................................................. 8-2
5. Bath temperature fluctuation at various proportional band settings.......... 8-6
6. Serial Communications Cable Wiring........................................................ 9-1

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User's Guide
viii

1-1
Chapter 1
Before You Start
1.1 Introduction
The Hart Scientific 7108 is a precise constant temperature bath. An innovative
state of the art solid-state temperature controller has been incorporated which
maintains the bath temperature with extreme stability. A lid to cover the bath
opening is required to reach the published stability. The controller uses a
microcontroller to execute the many operating functions.
User interface is provided by the 8-digit LED display and four buttons. Digital
remote communications is available with a RS-232 or optionally with a IEEE-488
interface.
The tank for the 7108 is stainless steel and holds 13.2 gallons (51 liters).
1.2 Symbols Used
Table 1 lists the International Electrical Symbols. Some or all of these symbols
may be used on the instrument or in this manual.
Table 1 International Electrical Symbols
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)
O
Off

7108
Users Guide
1-2
I
On
 Canadian Standards Association
CAT II
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree
2 per IEC1010-1 refers 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.
1.3 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 instrument
being used.
1.3.1 WARNINGS
WARNINGS
To avoid personal injury, follow these guidelines.
GENERAL
•DO NOT use the instrument for any application other than
calibration work. The instrument was designed for
temperature calibration. Any other use of the instrument
may cause unknown 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 4.3, 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 You Start
1.3 Safety Information1
•Before initial use, or after transport, or after storage in
humid or semi-humid environments, or anytime the
instrument has not been energized for more than 10 days,
the instrument needs to be energized for a "dry-out" period
of 2 hours before it can be assumed to meet all of the
safety requirements of the IEC 1010-1. If the product is wet
or has been in a wet environment, take necessary
measures to remove moisture prior to applying power such
as storage in a low humidity temperature chamber
operating at 50 °C for 4 hours or more.
•Overhead clearance is required. Do not place the
instrument under a cabinet or other structure. Always leave
enough clearance to allow for safe and easy insertion and
removal of probes.
•The instrument is intended for indoor use only.
•The bath is a precision instrument. Although it has been
designed for optimum durability and trouble free operation,
it must be handled with care. Position the bath before the
tank is filled with fluid by rolling it into place. DO NOT
attempt to lift the bath. DO NOT move a bath filled with
fluid.
BURN HAZARD
•Extremely cold temperatures may be present in this
equipment. Freezer burns and frostbite may result if
personnel fail to observe safety precautions.
•High temperatures may be present in this equipment.
Fires and severe burns may result if personnel fail to
observe safety precautions.
ELECTRICAL HAZARD
•These guidelines must be followed to ensure that the
safety mechanisms in this instrument will operate
properly. This instrument must be plugged into an AC
electric outlet of the appropriate voltage and frequency
(see Specifications). The power cord of the instrument is
equipped with a three-pronged grounding plug for your
protection against electrical shock hazards. It must be
plugged directly into a properly grounded three-prong
receptacle. The receptacle must be installed in
accordance with local codes and ordinances. Consult a
qualified electrician. DO NOT use an extension cord or
adapter plug.
•DO use a ground fault interrupt device. This instrument
contains a fluid. A ground fault device is advised in case
fluid is present in the electrical system and could cause
an electrical shock.

7108
Users Guide
1-4
•Always replace the power cord with an approved cord of
the correct rating and type. If you have questions,
contact an 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.
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 operation. 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 7.2,
Heat Transfer Fluid, for specific information on bath
fluids and Section 9.8, Cutout.
1.3.2 CAUTIONS
CAUTIONS
•To avoid possible damage to the instrument, follow
these guidelines.
•Use only a grounded AC mains supply of the appropriate
voltage to power the bath. The bath requires 3 amps at
115 VAC ( ±10 %), 50/60 Hz (1.6 amps at 230 VAC
[ ±10 %], 50/60 Hz, switchable).
•Always operate the bath in room temperatures between
5-45 °C (41-113 °F). Allow sufficient air circulation by
leaving at least 6 inches of space between the bath and
nearby objects. Overhead clearance needs to allow for
safe and easy insertion and removal of probes for
calibration.
•The bath is equipped with operator accessible fuses. If a
fuse blows, it may be due to a power surge or failure of a
component. Replace the fuse once. 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 replace the fuse with one of the same
rating, voltage, and type. Never replace the fuse with one
of a higher current rating.
•If a mains supply power fluctuation occurs, immediately
turn off the bath. Wait until the power has stabilized
before re-energizing the bath.

Before You Start
1.3 Safety Information1
•The bath is a precision instrument. Although it has been
designed for optimum durability and trouble free
operation, it must be handled with care. The instrument
should not be operated in excessively dusty or dirty
environments. Do not operate near flammable materials.
•If the bath is operated at higher temperatures where fluid
vaporization is significant, a fume hood should be used.
•When filling the tank, ensure the immersion coils are
completely covered.
•DO NOT operate the bath without fluid.
•DO NOT overfill the bath. Overflowing fluid may damage
the electrical system. See Section 4.3, Bath Preparation
and Filling, for specific instructions.
•Read Section 5, Bath Use, before placing the bath into
service.
•DO NOT change the values of the bath calibration
constants from the factory set values. The correct
setting of these parameters is important to the safety
and proper operation of the bath.
•The Factory Reset Sequence should be performed only
by authorized personnel if no other action is successful
in correcting a malfunction. You must have a copy of the
most recent Report of Test to restore the test
parameters.
•DO NOT operate this instrument in an excessively wet,
oily, dusty, or dirty environment.
•Most probes have handle temperature limits. Be sure
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 instruments that can be easily damaged.
Always handle these devices with care. Do not allow
them to be dropped, struck, stressed, or overheated.
•This bath is not designed to be portable. Therefore,
moving the bath once it has been installed should be
kept to a minimum. Never move a bath that is full of
fluid. This action could be extremely dangerous and
could result in personal injury to the person moving the
bath.
•If the bath must be moved, be sure to drain the fluid to
prevent any injury. To safely move the bath, two people
are required.

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Users Guide
1-6
1.4 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
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]

Before You Start
1.4 Authorized Service Centers1
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

7108
Users Guide
1-8

2-1
Chapter 2
Specifications and Environmental
Conditions
2.1 Specifications
See Table 2.
Table 2. Specifications
Specifications 7108
Operating Range 20 to 30 °C (68 to 86 °F)
with ambient temperature of 25 °C (77 °F)
Set-point Accuracy ±0.5 °C ( ±0.9 °F)
Display Resolution 0.01
Set-point Resolution 0.001
Vernier 0.000032
Ambient Temperature 5 to 45 °C (41 to 113 °F)
Typical short and long term temperature
stability Water at 25 °C: ±0.002 °C ( ±0.0036 °F)
Mineral Oil at 25 °C: ±0.004 °C ( ±0.0072 °F)
Temperature Gradients using Water ±0.005 °C ( ±0.009 °F)
Cooling capacity 100 watt thermoelectric
Controller Hybrid analog/digital controller with data retention
Over Temperature Control None
Power Requirements 115 VAC ( ±10 %), 50/60 Hz, 3 A (230 VAC
[ ±10 %], 50/60 Hz, 1.6 A,
optional), 350 W switchable
Work area 14"W x 8"H x 14"F–B
35.5 cm x 30.5 cm x 35.5cm
Tank Capacity 13.2 gallons (51 liters)
Exterior Dimensions 19.25“ W x 16.25"H x 25”D
48.9 cm x 41.3 cm x 63.5 cm
Weight 75 lb. / 35 kg

7108
Users Guide
2-2
2.2 Environmental Conditions
Although the instrument has been designed for optimum durability and trouble-
free operation, it must be handled with care. The instrument should not be
operated in an excessively dusty or dirty environment. Maintenance and cleaning
recommendations can be found in the Maintenance Section of this manual.
The instrument operates safely under the following conditions:
•temperature range: 5–45 °C (41–113 °F)
•ambient relative humidity: 15 – 50 %
•pressure: 75kPa–106kPa
•mains voltage within ±10 %of nominal
•vibrations in the calibration environment should be minimized
•altitude does not affect the performance or safety of the unit