Fluke Micro-Bath 7102 User Manual
7102
Micro-Bath
User’s Guide
Revision 830501-EN
Limited Warranty & Limitation of Liability
Each product from Fluke’s Hart Scientic Division (“Hart”) is warranted to be free from defects in mate rial
and workmanship under normal use and service. The warranty period is one year for the Micro-Bath. The
warranty period begins on the date of the shipment. Parts, product repairs, and services are warranted for
90 days. The warranty extends only to the original buyer or end-user customer of a Hart authorized reseller,
and does not apply to fuses, disposable batteries or to any other product which, in Hart’s opinion, has been
misused, altered, neglected, or damaged by accident or abnormal conditions of operation or handling. Hart
warrants that software will operate substantially in accordance with its functional speci cations for 90 days
and that it has been properly recorded on non-defective media. Hart does not warrant that software will be
error free or operate without interruption. Hart does not warrant calibrations on the Micro-Bath.
Hart 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 Hart. Warranty support is
available if product is purchased through a Hart authorized sales outlet or Buyer has paid the applicable
international price. Hart reserves the right to invoice Buyer for importation costs of repairs/replacement
parts when product purchased in one country is submitted for repair in another country.
Hart’s warranty obligation is limited, at Hart’s option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Hart authorized service center within the
warranty period.
To obtain warranty service, contact your nearest Hart authorized service center or send the product, with
a description of the difculty, postage, and insurance prepaid (FOB Destination), to the nearest Hart
authorized service center. Hart assumes no risk for damage in transit. Following warranty repair, the prod uct
will be returned to Buyer, transportation prepaid (FOB Destination). If Hart determines that the failure was
caused by misuse, alteration, accident or abnormal condition or operation or handling, Hart will provide an
estimate or 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. HART SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL. OR
CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, WHETHER ARISING
FROM BREACH OF WARRANTY OR BASED ON CONTRACT, TORT, RELIANCE OR ANY OTHER
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 of
competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.
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: support@hartscientic.com
www.hartscientific.com
Subject to change without notice. • Copyright © 2008 • Printed in USA
ii
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 Specications and Environmental Conditions ......................9
3.1 Specifications ........................................................................................... 9
3.2 Environmental Conditions ......................................................................... 9
4 Quick Start .............................................................................. 11
4.1 Unpacking .............................................................................................. 11
4.2 Setup ...................................................................................................... 11
4.3 Power ..................................................................................................... 12
4.4 Setting the Temperature ......................................................................... 12
5 Installation ............................................................................. 13
5.1 Bath Environment ................................................................................... 13
5.2 “Dry-out” Period ..................................................................................... 13
5.3 Bath Preparation and Filling .................................................................. 13
5.4 Power ..................................................................................................... 14
6 Bath Use .................................................................................15
6.1 General .................................................................................................. 15
6.2 Comparison Calibration ......................................................................... 15
6.3 Calibration of Multiple Probes ................................................................. 16
7 Parts and Controls ................................................................17
7.1 Front Panel ............................................................................................. 17
7.2 Back Panel ............................................................................................. 17
7.3 Accessories ........................................................................................... 19
7.3.1 Transport/Pour Access Lid ........................................................................... 19
iii
7.3.2 Access Cover (Optional) ..............................................................................19
7.3.3 Probe Basket ................................................................................................20
7.3.4 Stir Bar ..........................................................................................................20
7.3.5 Well Extender (Optional) ..............................................................................20
8 General Operation ..................................................................21
8.1 Changing Display Units .......................................................................... 21
8.2 Switching to 230V Operation .................................................................. 21
8.3 Bath Fluid ................................................................................................ 21
8.3.1 Temperature Range .......................................................................................21
8.3.2 Viscosity ........................................................................................................22
8.3.3 Specific Heat .................................................................................................22
8.3.4 Thermal Conductivity ....................................................................................22
8.3.5 Thermal Expansion........................................................................................22
8.3.6 Electrical Resistivity .......................................................................................22
8.3.7 Fluid Lifetime ................................................................................................. 23
8.3.8 Safety ............................................................................................................23
8.3.9 Cost ............................................................................................................... 23
8.3.10 Commonly Used Fluids ................................................................................. 23
8.3.10.1 Water (Distilled) ................................................................................................... 24
8.3.10.2 Mineral Oil ............................................................................................................ 24
8.3.10.3 Silicone Oil (Dow Corning 200.05, 200.10, 200.20) ............................................. 24
8.3.11 Fluid Characteristics Charts .......................................................................... 24
8.3.11.1 Limitations and Disclaimer .................................................................................. 25
8.3.11.2 About the Graph .................................................................................................. 26
8.4 Stirring ..................................................................................................... 27
8.5 Power ..................................................................................................... 28
8.6 Thermal Electric Devices (TED) ............................................................. 28
8.7 Fluid Drain .............................................................................................. 28
8.8 Temperature Controller .......................................................................... 28
9 Controller Operation .............................................................31
9.1 Well Temperature ................................................................................... 31
9.2 Temperature Set-point ........................................................................... 31
9.2.1 Programmable Set-points ............................................................................31
9.2.2 Set-point Value ............................................................................................. 33
9.2.3 Temperature Scale Units .............................................................................. 33
9.3 Scan ....................................................................................................... 34
9.3.1 Scan Control .................................................................................................34
9.3.2 Scan Rate .....................................................................................................34
iv
9.4 Temperature Display Hold ..................................................................... 35
9.4.1 Hold Temperature Display ............................................................................35
9.4.2 Mode Setting ................................................................................................ 35
9.4.3 Switch Wiring ................................................................................................36
9.4.4 Switch Test Example ....................................................................................36
9.5 Secondary Menu .................................................................................... 36
9.6 Thermal Electric Device (TED) ............................................................... 37
9.7 Proportional Band .................................................................................. 37
9.8 Controller Configuration .......................................................................... 38
9.8.1 Operating Parameters ...................................................................................38
9.8.1.1 High Limit ............................................................................................................ 39
9.8.1.2 Stir Speed ............................................................................................................ 39
9.8.2 Serial Interface Parameters ..........................................................................39
9.8.2.1 Baud Rate ............................................................................................................. 40
9.8.2.2 Sample Period ...................................................................................................... 40
9.8.2.3 Duplex Mode ........................................................................................................ 41
9.8.2.4 Linefeed ............................................................................................................... 41
9.8.3 Calibration Parameters ..................................................................................41
9.8.3.1 R0 ........................................................................................................................ 42
9.8.3.2 ALPHA ................................................................................................................. 42
9.8.3.3 DELTA .................................................................................................................. 42
9.8.3.4 C0 and CG ........................................................................................................... 42
9.8.3.5 rCAL ..................................................................................................................... 42
10 Digital Communication Interface ..........................................43
10.1 Serial Communications .......................................................................... 43
10.1.1 Wiring ...........................................................................................................43
10.1.2 Setup ............................................................................................................43
10.1.2.1 Baud Rate ........................................................................................................... 44
10.1.2.2 Sample Period ...................................................................................................... 44
10.1.2.3 Duplex Mode ........................................................................................................ 44
10.1.2.4 Linefeed ................................................................................................................ 44
10.1.3 Serial Operation ............................................................................................44
10.2 Interface Commands .............................................................................. 45
11 Test Probe Calibration ...........................................................47
11.1 Calibrating a Single Probe ..................................................................... 47
11.2 Stabilization and Accuracy .................................................................... 47
12 Calibration Procedure ...........................................................49
v
12.1 Calibration Points ................................................................................... 49
12.2 Calibration Procedure ............................................................................ 49
12.2.1 Compute DELTA ........................................................................................... 50
12.2.2 Compute R0 & ALPHA ..................................................................................50
12.2.3 Accuracy & Repeatability .............................................................................51
13 Maintenance ..........................................................................53
14 Troubleshooting .....................................................................55
14.1 Troubleshooting Problems, Possible Causes, and Solutions ................. 55
14.2 Comments ............................................................................................... 56
14.2.1 EMC Directive ...............................................................................................56
14.2.2 Low Voltage Directive (Safety) ...................................................................... 56
vi
Tables
Table 1 International Electrical Symbols ........................................................... 1
Table 2 Specifications ....................................................................................... 9
Table 3 Table of Various Bath Fluids ............................................................... 25
Table 4 Nominal Stirrer Motor Settings With Different Liquids ........................ 27
Table 5 Controller Communications Commands ............................................. 46
vii
Figures
Figure 1 7102 Front Panel ................................................................................ 17
Figure 2 7102 Back Panel and Bottom ............................................................ 18
Figure 3 Bath Lids and Lid Parts ..................................................................... 19
Figure 4 Probe Basket ..................................................................................... 20
Figure 5 Stir Bar ............................................................................................... 20
Figure 6 Chart of Various Bath Fluids ............................................................. 26
Figure 7 Controller Operation Flowchart ......................................................... 32
Figure 8 Serial Cable Wiring ........................................................................... 43
viii
Before You Start
Symbols Used
Before You Start1
Symbols Used1.1
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 Guide (Important Information)
Off
On
Canadian Standards Association
1
7102 Micro-Bath User’s Guide
Safety Information
Symbol Description
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 xed 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.
Safety Information 1.2
Use this instrument only as specied in this manual. Otherwise, the protection
provided by the instrument may be impaired.
The following denitions apply to the terms “Warning” and “Caution”.
“Warning” identies conditions and actions that may pose hazards to the user.
“Caution” identies conditions and actions that may damage the instru ment
being used.
1.2.1 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 uids 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 uids vaporizing.
Follow all safety guidelines listed in the user’s manual.
2
Before You Start
Safety Information
Calibration Equipment should only be used by Trained Personnel.
If this equipment is used in a manner not specied by the manufacturer, the protection
provided by the equipment may be impaired or safety hazards may arise.
Inspect the instrument for damage before each use. DO NOT use the instru ment 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.
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 sur faces
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 ar eas
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 uid at high temperatures. The uid will be the same
temperature as the display temperature.
DO NOT operate near ammable materials. Extreme temperatures could ignite the
ammable material.
Use of this instrument at HIGH TEMPERATURES for extended periods of time
requires caution.
3
7102 Micro-Bath User’s Guide
Safety Information
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, Specications. The power cord of the instrument
is equipped with a three-pronged grounding plug for your protection against electrical
shock haz ards. It must be plugged directly into a properly grounded three-prong
recepta cle. The receptacle must be installed in accordance with local codes and
ordinances or adapter plug. DO NOT use an extension cord. Consult a qualied
electrician. Always inspect the power cord before use for any damage to the in sulation
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 Scientic 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 intrument, follow these guidelines.
Always operate this instrument at room temperatures listed in Section 3.2,
Environmental Conditions. Allow sufcient 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.
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.
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.
4
Before You Start
Authorized Service Centers
Most probes have handle temperature limits. Be sure that the probe handle tem perature
limit is not exceeded in the air above the instrument.
The instrument and any thermometer probes used with it are sensitive instru ments 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 cali brate
from high temperatures to low temperatures with the appropriate triple point of water
checks.
Components and heater lifetimes can be shortened by continuous high tempera ture
operation.
If a mains supply power uctuation occurs, immediately turn off the bath. Power
bumps from brown-outs and black-outs can damage the instrument. Wait until the
power has stabilized before re-energizing the bath.
Fluids may expand at different rates. Allow for uid expansion inside the well as
the instrument heats. Otherwise, the uid may overow 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 Scientic Division
5
7102 Micro-Bath User’s Guide
Authorized Service Centers
Fluke Nederland B.V.
Fluke Int’l Corporation
Fluke South East Asia Pte Ltd.
When contacting these Service Centers for support, please have the following
information available:
Model Number
Serial Number
Voltage
Complete description of the problem
6
Introduction
Introduction 2
The Hart Scientic 7102 Micro-Bath may be used as a portable instrument or bench
top temperature calibrator for calibrating thermocouple and RTD temper ature probes.
The 7102 is small enough to use in the eld, 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.
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 con troller. 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 tempera ture
within the specied range. The calibrator’s multiple fault protection de vices insure
user and instrument safety and protection.
The 7102 Micro-Bath was designed for portability, low cost, and ease of opera tion.
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 de scribed in the instruction
manual.
7
Specications and Environmental Conditions3
3.1 Specications
Specifications Table 2
Range -5 to 125°C (23 to 257°F)
Accuracy ±0.25°C
Stability ±0.015°C at -5°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)
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 uid
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)
Cooling Fan and Thermal Electric Devices (TED)
Fault Protection Sensor burnout and short protection
Safety Overvoltage (Installation) Category II, Pollution Degree 2 per IEC 61010-01
Fuse Rating 115 V: 250 V 3A SB (slow blow)
Specications and Environmental Conditions
Specications
±0.03°C at 121°C (oil, 5010)
(access opening is 1.9" [48 mm] in diameter)
150 W
230 V: 250 V 1.6 A T (time delay)
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:
ambient temperature range: 5 – 45°C (41 – 113°F)
ambient relative humidity: maximum 80% for temperature <31°C, de creasing
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
9
Quick Start4
Caution: READ SECTION 6 ENTITLED BATH USE before placing the bath in
service. Incorrect handling can damage the bath and void the war ranty.
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
Quick Start
Unpacking
Setup 4.2
Caution: DO NOT operate this instrument without fluid.
Place the calibrator on a at surface with at least 6 inches of free space around the
instrument. Plug the power cord into a grounded mains outlet. Observe that the
nominal voltage corresponds to that indicated on the back of the calibrator.
Carefully insert the probe basket into the well. Fill the well with the appropriate uid.
The set-point temperature and the number of and size of probes deter mine the uid
level. Be sure to keep the uid level an adequate distance below the top of the well
to prevent overowing the uid when the probes are in serted. For example, placing
200.05 oil at room temperature (25°C) into the bath and heating the unit to 125°C,
causes a 1-inch (2.54 cm) expansion of the uid inside the well.
Keep the uid level at least 1.9 cm (0.75 inches) below the top of the well at all
times. With the probe (probes) in the well ll the tank 3/4 full. Heat to the maximum
temperature of the uid. Slowly ll the well to 2.54 cm (1 inch) be low the top of the
basket at the maximum temperature of the uid.
11
7102 Micro-Bath User’s Guide
Power
Turn on the power to the calibrator by toggling the switch on the power entry module.
The fan should begin blowing air through the instrument and the con troller display
should illuminate after 3 seconds. After a brief self test the con troller should begin
normal operation. If the unit fails to operate please check the power connection.
The display shows the well temperature and the well TEDs start operating to bring
the temperature of the well to the set-point temperature. Insure that the uid is being
stirred.
Power 4.3
Plug the Micro-Bath power cord into a mains outlet of the proper voltage, fre quency,
and current capability. Refer to Section 3.1, Specications, for power details. Turn the
bath on using the rear panel “POWER” switch. The Micro-Bath will turn on and begin
to heat to the previously programmed temperature set-point. The front panel LED
display will indicate the actual bath temperature.
Setting the Temperature 4.4
Section 9.2 explains in detail how to set the temperature set-point on the cali brator
using the front panel keys. The procedure is summarized here.
Press “SET” twice to access the set-point value. 1.
Press “UP” or “DOWN” to change the set-point value. 2.
Press “SET” to store the new set-point. 3.
Press “EXIT” to return to the temperature display. 4.
When the set-point temperature is changed the controller switches the heater on or off
to raise or lower the temperature. The displayed well tempera ture gradually changes
until it reaches the set-point temperature. The well may require 25 minutes to reach
the set-point depending on the span. Another 10 to 15 minutes is required to stabilize
within ±0.03°C of the set-point. Ultimate sta bility may take 20 to 30 minutes more of
stabilization time.
12
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