Fluke 7102 Operating Manual

7102

Micro-Bath

PN 3729328
December 2013

© 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.

User's Guide

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 out let 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. Followi ng
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 fail ures 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

Table of Contents

Chapter Title Page

1 Before You Start .................................................................................. 1-1

1.1 Symbols Used ................................................................................. 1-1

1.2 Safety Information ........................................................................... 1-2

1.2.1 Warnings ............................................................................... 1-2

1.2.2 Cautions ................................................................................... 1-4

1.3 Authorized Service Centers ............................................................. 1-5

2 Introduction ......................................................................................... 2-1

3 Specifications and Environmental Conditions ................................. 3-1

3.1 Specifications .................................................................................. 3-1

3.2 Environmental Conditions ................................................................ 3-2

4 Quick Start ........................................................................................... 4-1

4.1 Unpacking ........................................................................................ 4-1

4.2 Setup ............................................................................................... 4-2

4.3 Power .............................................................................................. 4-2

4.4 Setting the Temperature .................................................................. 4-2

5 Installation ........................................................................................... 5-1

5.1 Bath Environment ............................................................................ 5-1

5.2 “Dry-out” Period ............................................................................... 5-1

5.3 Bath Preparation and Filling ............................................................ 5-2

5.4 Power .............................................................................................. 5-2

6 Bath Use ............................................................................................... 6-1

6.1 General ............................................................................................ 6-1

6.2 Comparison Calibration ................................................................... 6-2

6.3 Calibration of Multiple Probes.......................................................... 6-2

i

7102

User's Guide

7 Parts and Controls .............................................................................. 7-1

7.1 Front Panel ...................................................................................... 7-1

7.2 Back Panel ...................................................................................... 7-2

7.3 Accessories ..................................................................................... 7-3

7.3.1 Transport/Pour Access Lid ....................................................... 7-3

7.3.2 Access Cover (Optional) ........................................................... 7-4

7.3.3 Probe Basket ............................................................................ 7-4

7.3.4 Stir Bar ...................................................................................... 7-4

7.3.5 Well Extender (Optional) .......................................................... 7-4

8 General Operation ............................................................................... 8-1

8.1 Changing Display Units ................................................................... 8-1

8.2 Switching to 230V Operation ........................................................... 8-1

8.3 Bath Fluid ........................................................................................ 8-1

8.3.1 Temperature Range ................................................................. 8-2

8.3.2 Viscosity ................................................................................... 8-2

8.3.3 Specific Heat ............................................................................ 8-2

8.3.4 Thermal Conductivity ................................................................ 8-2

8.3.5 Thermal Expansion ................................................................... 8-2

8.3.6 Electrical Resistivity .................................................................. 8-3

8.3.7 Fluid Lifetime ........................................................................ 8-3

8.3.8 Safety ....................................................................................... 8-3

8.3.9 Cost .......................................................................................... 8-3

8.3.10 Commonly Used Fluids .......................................................... 8-3

8.3.10.1 Water (Distilled) ............................................................... 8-4

8.3.10.2 Mineral Oil ....................................................................... 8-4

8.3.10.3 Silicone Oil (Dow Corning 200.05, 200.10, 200.20) ........ 8-4

8.3.11 Fluid Characteristics Charts ................................................... 8-4

8.3.11.1 Limitations and Disclaimer ............................................... 8-5

8.3.11.2 About the Graph .............................................................. 8-6

8.4 Stirring ............................................................................................. 8-7

8.5 Power .............................................................................................. 8-8

8.6 Thermal Electric Devices (TED) ...................................................... 8-8

8.7 Fluid Drain ....................................................................................... 8-9

8.8 Temperature Controller ................................................................... 8-9

9 Controller Operation ........................................................................... 9-1

9.1 Well Temperature ............................................................................ 9-1

9.2 Temperature Set-point ..................................................................... 9-1

9.2.1 Programmable Set-points ......................................................... 9-1

9.2.2 Set-point Value ......................................................................... 9-3

9.2.3 Temperature Scale Units .......................................................... 9-3

9.3 Scan ................................................................................................ 9-4

9.3.1 Scan Control ............................................................................. 9-4

9.3.2 Scan Rate ................................................................................. 9-4

9.4 Temperature Display Hold ............................................................... 9-4

9.4.1 Hold Temperature Display ........................................................ 9-5

9.4.2 Mode Setting ............................................................................ 9-5

9.4.3 Switch Wiring ............................................................................ 9-5

9.4.4 Switch Test Example ................................................................ 9-6

9.5 Secondary Menu ............................................................................. 9-6

9.6 Thermal Electric Device (TED) ........................................................ 9-6

9.7 Proportional Band ............................................................................ 9-7

9.8 Controller Configuration .................................................................. 9-8

ii

Contents (continued)

9.8.1 Operating Parameters .............................................................. 9-8

9.8.1.1 High Limit ........................................................................... 9-9

9.8.1.2 Stir Speed .......................................................................... 9-9

9.8.2 Serial Interface Parameters ...................................................... 9-9

9.8.2.1 Baud Rate .......................................................................... 9-10

9.8.2.2 Sample Period ................................................................... 9-10

9.8.2.3 Duplex Mode ..................................................................... 9-10

9.8.2.4 Linefeed ............................................................................. 9-11

9.8.3 Calibration Parameters ............................................................. 9-11

9.8.3.1 R0 ...................................................................................... 9-12

9.8.3.2 ALPHA ............................................................................... 9-12

9.8.3.3 DELTA ............................................................................... 9-12

9.8.3.4 C0 and CG ......................................................................... 9-12

9.8.3.5 rCAL .................................................................................. 9-12

10 Digital Communication Interface ....................................................... 10-1

10.1 Serial Communications.................................................................. 10-2

10.1.1 Wiring ..................................................................................... 10-2

10.1.2 Setup ...................................................................................... 10-2

10.1.2.1 Baud Rate ........................................................................ 10-2

10.1.2.2 Sample Period ................................................................. 10-3

10.1.2.3 Duplex Mode ................................................................... 10-3

10.1.2.4 Linefeed ........................................................................... 10-3

10.1.3 Serial Operation ...................................................................... 10-3

10.2 Interface Commands ..................................................................... 10-3

11 Test Probe Calibration ........................................................................ 11-1

11.1 Calibrating a Single Probe ............................................................. 11-1

11.2 Stabilization and Accuracy ............................................................ 11-2

12 Calibration Procedure ......................................................................... 12-1

12.1 Calibration Points .......................................................................... 12-1

12.2 Calibration Procedure .................................................................... 12-2

12.2.1 Compute DELTA .................................................................... 12-2

12.2.2 Compute R0 & ALPHA ........................................................... 12-3

12.2.3 Accuracy & Repeatability ........................................................ 12-3

13 Maintenance ......................................................................................... 13-1

14 Troubleshooting .................................................................................. 14-1

14.1 Troubleshooting Problems, Possible Causes, and Solutions ........ 14-1

14.2 Comments ..................................................................................... 14-4

14.2.1 EMC Directive ......................................................................... 14-4

14.2.2 Low Voltage Directive (Safety) ............................................... 14-4

iii

7102

User's Guide

iv

List of Tables

Table Title Page

1. International Electrical Symbols ................................................................ 1-1

2. Specifications ............................................................................................ 3-1

3. Table of Various Bath Fluids ..................................................................... 8-5

4. Nominal Stirrer Motor SettingsWith Different Liquids ................................ 8-8

5. Controller Communications Commands .................................................... 10-4

v

7102

User's Guide

vi

List of Figures

Figure Title Page

1. 7102 Front Panel ....................................................................................... 7-1

2. 7102 Back Panel and Bottom .................................................................... 7-2

3. Bath Lids and Lid Parts ............................................................................. 7-3

4. Probe Basket ............................................................................................. 7-4

5. Stir Bar ...................................................................................................... 7-4

6. Chart of Various Bath Fluids ..................................................................... 8-6

7. Controller Operation Flowchart ................................................................. 9-2

8. Serial Cable Wiring .................................................................................... 10-2

vii

7102

User's Guide

viii

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

Chapter 1

Before You Start

Table 1. International Electrical Symbols

 Battery

 CE Complies with European Union directives

 DC

 Double Insulated

 Electric Shock

 Fuse

 PE Ground
 Hot Surface (Burn Hazard)
 Read the User’s Guide (Important Information)

O Off

I On

 Canadian Standards Association

OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2
per IEC1010-1 refers to the level of Impulse Withstand Voltage

CATII

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-TICK Australian EMC mark

The European Waste Electrical and Electronic Equipment (WEEE)



Directive (2002/96/

EC) mark.

1-1

7102

User's Guide

1.2 Safety Information

Use this instrument only as specified in this manual. Otherwise, the protection
provided by the instrument maybe 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.

1.2.1 Warnings

 Warnings

To avoid personal injury, follow these guidelines.

• Disclaimer: Hart Scientific manufactures instruments for the

purpose of temperature calibration. Instruments used for
applications other than calibration are used at the discretion
and sole responsibility of the customer. Hart Scientific
cannot accept any responsibility for the use of instruments
for any application other than temperature calibration.

GENERAL

• DO NOT install an access cover without holes onto a bath

that is energized. Dangerous pressures may result from
fluids vaporizing.

• DO NOT use the instrument for any application other than

calibration work. The instrument was designed for
temperature calibration. Any other use of the unit may
cause unknown hazards to the user.

• DO NOT use the unit in environments other than those

listed in the user’s guide. Completely unattended operation
in not recommended.

• DO NOT install access cover without holes onto a bath that

is energized. Dangerous pressures may result from fluids
vaporizing.

• 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 or safety hazards may arise.

1-2

• Inspect the instrument for damage before each use. DO NOT

use the instrument if it appears damaged or operates
abnormally.

• 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 61010-1. 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.

• The instrument is intended for indoor use only.

• Lift the instrument by the handle provided to move the

instrument. DO NOT move the instrument until the display
reads less than 25 °C (77 °F) and the unit has been drained
or the Transport Lid installed.

BURN HAZARD

• ALWAYS ensure the instrument is COOL before closing the

instrument for storage.

Before You Start

1.2 Safety Information1

• DO NOT touch the well access surface of the unit.

• DO NOT mix water and oil when exceeding temperatures of
90 °C (194 °F).

• DO NOT mix water and oil when exceeding temperatures of

90 °C (194 °F). The temperature of the well access is the
same as the actual temperature shown on the display, e.g. if
the unit is set at 125 °C and the display reads 125 °C, the
well is at 125 °C.

• Ensure the power cord is positioned in such a way as it
cannot contact hot surfaces or temperature probes. Always
inspect power cord before use for any damage to the
insulation due to contact with hot surfaces, cuts or
abrasions.

• The top sheet metal of the instrument may exhibit extreme
temperatures for areas close to the well access.

• DO NOT turn off the unit at temperatures higher than 100 °C.
This could create a hazardous situation. Select a set-point
less than 100 °C and allow the unit to cool before turning it
off.

• DO NOT remove the fluid at high temperatures. The fluid will
be the same temperature as the display temperature.

• DO NOT operate near flammable materials. Extreme
temperatures could ignite the flammable material.

• Use of this instrument at HIGH TEMPERATURES for
extended periods of time requires caution.

1-3

7102

User's Guide

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 only electric outlet
as listed in Section 3.1, 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 three­prong receptacle. The receptacle must be installed in
accordance with local codes and ordinances or adapter
plug. DO NOT use an extension cord. Consult a qualified
electrician. Always inspect the power cord before use for
any damage to the insulation due to contact with hot
surfaces, cuts or abrasions.

• The instrument 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 a Hart Scientific Authorized
Service Center. Always replace the fuse with one of the
same rating, voltage, and type. Never replace the fuse with
one of a higher current rating.

• 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.

1.2.2 Cautions

To avoid possible damage to the instrument, follow these
guidelines.

• Always operate this instrument at room temperatures listed
in Section 3.2, Environmental Conditions. Allow sufficient
air circulation by leaving at least 6 inches (15 cm) of
clearance around the instrument.

• Overhead clearance is required. DO NOT place this
instrument under a cabinet or other structure.

• Never introduce any foreign material into the well.

• DO NOT change the values of the calibration constants from

the factory set values. The correct setting of these
parameters is important to the safety and proper operation
of the unit.

 Cautions

1-4

• DO NOT slam the probe stems into the well. This type of
action can cause a shock to the sensor and affect the
calibration.

• DO use a ground fault interrupt device.

1.3 Authorized Service Centers1

• DO NOT operate this instrument in an excessively wet, oily,
dusty, or dirty environment.

• The unit is a precision instrument. Although it has been
designed for optimum durability and trouble free operation,
it must be handled with care.

• 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.

• When calibrating PRTs always follow correct calibration
procedure and calibrate from high temperatures to low
temperatures with the appropriate triple point of water
checks.

• Components and heater lifetimes can be shortened by
continuous high temperature operation.

• If a mains supply power fluctuation occurs, immediately
turn off the bath. Power bumps from brown-outs and black­outs can damage the instrument. Wait until the power has
stabilized before re-energizing the bath.

Before You Start

• Fluids may expand at different rates. Allow for fluid
expansion inside the well as the instrument heats.
Otherwise, the fluid may overflow the well and leak into the
instrument.

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: + 1.801.763.1600
Telefax: +1.801.763.1010

E-mail: [e-mail]

1-5

7102

User's Guide

Fluke Nederland B.V.

Customer Support Services

Science Park Eindhoven 5108

5692 EC Son

NETHERLANDS
Phone: [phone]
Telefax: [phone]

E-mail: [e-mail]

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: [e-mail]

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: [e-mail]

When contacting these Service Centers for support, please have the following
information available:

1-6

• Model Number

• Serial Number

• Voltage

• Complete description of the problem

The Hart Scientific 7102 Micro-Bath may be used as a portable instrument or
bench top temperature calibrator for calibrating thermocouple and RTD
temperature probes. The 7102 is small enough to use in the field, and accurate
enough to use in the lab. With an ambient temperature of 23 °C (74 °F),
calibrations may be done over a range of −5 °C to 126 °C (23 °F to 259 °F). The
resolution of the 7102 temperature display is 0.01 degrees.

Chapter 2

Introduction

The Micro-Bath calibrator features:

• Convenient handle

• RS-232 interface

• Switchable AC Input (115 VAC or 230 VAC)

• Optional well extender to extend well depth

Built in programmable features include:

• Temperature scan rate control

• Temperature switch hold

• Eight Set-point memory

• Adjustable readout in °C or °F

The temperature is accurately controlled by Hart’s hybrid analog/digital controller.
The controller uses a precision platinum RTD as a sensor and controls the well
temperature with a solid state relay (triac) driven heater.

The LED front panel continuously shows the current well temperature. The
temperature may be easily set with the control buttons to any desired
temperature within the specified range. The calibrator’s multiple fault protection
devices insure user and instrument safety and protection.

The 7102 Micro-Bath was designed for portability, low cost, and ease of
operation. Through proper use, the instrument will continuously provide accurate
calibration of temperature sensors and devices. The user should be familiar with
the safety guidelines and operating procedures of the calibrator as described in
the instruction manual.

2-1

7102

User's Guide

2-2

Chapter 3

Specifications and Environmental

Conditions

3.1 Specifications

Table 2. Specifications

Range −5 to 125 °C (23 to 257 °F)
Accuracy ±0.25 °C
Stability ±0.015 °C at −5 °C (oil, 5010)

±0.03 °C at 121 °C (oil, 5010)

Uniformity ±0.02 °C
Resolution 0.01 °C/F
Operating Temperature 5 to 45 °C (41 to 113 °F)
Heating Time 25 °C to 100 °C (77 °F to 212 °F): 30 minutes
Cooling Time 25 °C to 0 °C (77 °F to 32 °F): 30 minutes

Well Size 2.5" dia. x 5.5" deep (64 x 139 mm)

(access opening is 1.9" [48 mm] in diameter )

Exterior Dimension 12" H x 7.2" W x 9.5" D (31 cm x 18 cm x 24 cm)

Weight 15 lb. (6.8 kg) with fluid
Power 115 VAC ( ±10 %), 1.8 A, or 230 VAC ( ±10 %), 0.9

A, switchable, 50/60 Hz, 200 W

Readout Switchable °C or °F

Controller Digital controller with data retention

Thermal Electric Devices (TED) 150 W

Cooling Fan and Thermal Electric Devices (TED)

Fault Protection Sensor burnout and short protection

Safety Overvoltage (Installation) Category II, Pollution

Fuse Rating 115 V: 250 V 3A SB (slow blow)

Degree 2 per IEC 61010-01

230 V: 250 V 1.6 A T (time delay)

3-1

7102

User's Guide

3.2 Environmental Conditions

Although the instrument has been designed for optimum durability and trouble­free 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:

• ambient temperature range: 5 − 45 °C (41 − 113 °F)

• ambient relative humidity: maximum 80 % for temperature <31 °C, decreasing
linearly to 50 % at 40 °C

• mains voltage within ± 10 % of nominal

• vibrations in the calibration environment should be minimized

• altitudes less than 2,000 meters

3-2

 Caution:

READ SECTION 6 ENTITLED BATH USE before placing the bath
in service. Incorrect handling can damage the bath and void the
warranty.

Chapter 4

Quick Start

4.1 Unpacking

Unpack the Micro-Bath carefully and inspect it for any damage that may have
occurred during shipment. If there is shipping damage, notify the carrier
immediately.

Verify that the following components are present:

• 7102 Micro-Bath

• Transport/Pour Access Lid

• Probe Basket

• Stir Bar

• Power Cord

• User’s Guide

• Report of Calibration

• Calibration Label

• Access Cover, optional

• Well Extender, optional

4-1