Fluke 7037 User manual

May 2016
© 2016 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
7037/7038/7040/7041
Calibration Bath
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 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

i
Table of Contents
Title Page
Before You Start.................................................................................... 1
Symbols Used ................................................................................... 1
Safety Information.............................................................................. 2
Cautions ............................................................................................ 5
How to Contact Fluke Calibration.......................................................... 6
Product Introduction .............................................................................. 7
Specifications ........................................................................................ 8
Environmental Conditions.................................................................. 9
Quick Start............................................................................................. 9
Unpacking.......................................................................................... 9
Set Up................................................................................................ 10
Power ................................................................................................ 10
Set the Temperature.......................................................................... 10
Installation ............................................................................................. 12
Bath Environment.............................................................................. 12
“Dry-out” Period................................................................................. 12
Bath Preparation and Filling .............................................................. 12
Probe................................................................................................. 13
Power ................................................................................................ 13
Bath Use................................................................................................ 13
General.............................................................................................. 14
Comparison Calibration..................................................................... 14
Calibration of Multiple Probes............................................................ 15
Parts and Controls................................................................................. 16
Front Control Panel ........................................................................... 16
Side Panel ......................................................................................... 17
Back Panel ........................................................................................ 19
Bath Tank and Lid ............................................................................. 20
General Operation................................................................................. 22
Bath Fluid .......................................................................................... 22
Temperature Range ...................................................................... 22
Viscosity ........................................................................................ 22
Specific Heat ................................................................................. 22
Thermal Conductivity..................................................................... 23
Thermal Expansion........................................................................ 23
Electrical Resistivity....................................................................... 23

7037/7038/7040/7041
User's Guide
ii
Fluid Lifetime ................................................................................. 23
Safety ............................................................................................ 23
Cost ............................................................................................... 24
Commonly Used Fluids ................................................................. 24
Fluid Characteristics Charts .......................................................... 25
About the Graph............................................................................ 25
Stirring ............................................................................................... 29
Power ................................................................................................ 29
Heater................................................................................................ 29
Cooling .............................................................................................. 30
Temperature Controller ..................................................................... 30
Controller Operation.............................................................................. 31
Bath Temperature.............................................................................. 31
Reset Cutout...................................................................................... 31
Temperature Set-point....................................................................... 33
Programmable Set-points.............................................................. 33
Set-point Value.............................................................................. 34
Set-point Vernier............................................................................ 34
Temperature Scale Units................................................................... 35
Secondary Menu ............................................................................... 35
Heater Power..................................................................................... 36
Proportional Band.............................................................................. 36
Cutout................................................................................................ 38
Controller Configuration..................................................................... 39
Probe Parameters.............................................................................. 39
R0.................................................................................................. 40
ALPHA........................................................................................... 40
Operating Parameters ....................................................................... 40
Cutout Reset Mode........................................................................ 40
Serial Interface Parameters............................................................... 40
Baud Rate...................................................................................... 41
Sample Period............................................................................... 41
Duplex Mode ................................................................................. 42
Linefeed......................................................................................... 42
IEEE-488 Parameters........................................................................ 42
IEEE-488 Address......................................................................... 43
Calibration Parameters...................................................................... 43
CTO............................................................................................... 43
BO and BG .................................................................................... 43
H and L.......................................................................................... 43
Digital Communication Interface............................................................ 44
Serial Communications...................................................................... 44
Wiring ............................................................................................ 44
Setup ............................................................................................. 45
Serial Operation............................................................................. 46
IEEE-488 Communication (optional) ................................................. 46
Setup ............................................................................................. 46
IEEE-488 Operation ...................................................................... 46
Interface Commands ......................................................................... 46
Power Control Functions ................................................................... 49
Heater Control ............................................................................... 49
Cooling Control.............................................................................. 50
Full Remote Operation .................................................................. 50
Calibration Procedure............................................................................ 51
Calibration Points .............................................................................. 51

Contents (continued)
iii
Measuring the Set-point Error ........................................................... 51
Computing R0and ALPHA ................................................................ 52
Calibration Example .......................................................................... 52
Maintenance.......................................................................................... 53
Troubleshooting..................................................................................... 55
Troubleshooting Table....................................................................... 55
Comments ......................................................................................... 58
EMC Directive................................................................................ 58
Low Voltage Directive (Safety) ...................................................... 59

7037/7038/7040/7041
User's Guide
iv

v
List of Tables
Table Title Page
1. Symbols..................................................................................................... 1
2. Table of Various Bath Fluids and their Properties..................................... 26
3. Proportional Band- Fluid Table.................................................................. 37
4. Interface Command Summary .................................................................. 47
5. Serial Power Control Functions................................................................. 50
6. Remote Operation Ranges and Settings................................................... 51

7037/7038/7040/7041
User's Guide
vi

vii
List of Figures
Figure Title Page
1. Bath Assembly .......................................................................................... 7
2. Front Panel................................................................................................ 16
3. Refrigeration Side Panel Controls............................................................. 17
4. Back Panel ................................................................................................ 19
5. Drain Location and Lid Options................................................................. 21
6. Chart of Various Bath Fluids and their Properties..................................... 28
7. Controller Operation Flow Chart................................................................ 32
8. Bath Temperature Fluctuation at Various Proportional Band Settings...... 37
9. Serial Cable Wiring.................................................................................... 44
10. Calibration Example .................................................................................. 53

7037/7038/7040/7041
User's Guide
viii

1
Before You Start
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. Symbols
Symbol Description
XWARNING. HAZARDOUS VOLTAGE. Risk of electric shock.
WWARNING - RISK OF DANGER. Consult user documentation.
AC (Alternating Current)
AC-DC
DC
TDouble Insulated
.PE Ground
 Battery
Hot suface
O Off
I On
)Certified by CSA Group to North American safety standards.
Measurement Category II is applicable to test and measuring circuits connected directly
to utilization points (socket outlets and similar points) of the low-voltage MAINS
installation.

7037/7038/7040/7041
User's Guide
2
PConforms to European Union directives.
Conforms to relevant Australian EMC standards.
Fuse
ÃConforms to relevant South Korean EMC Standards.
~
This product complies with the WEEE Directive marking requirements. The affixed label
indicates that you must not discard this electrical/electronic product in domestic
household waste. Product Category: With reference to the equipment types in the WEEE
Directive Annex I, this product is classed as category 9 "Monitoring and Control
Instrumentation" product. Do not dispose of this product as unsorted municipal waste.
Safety Information
Use this instrument only as specified in this manual. Otherwise, the protection
provided by the instrument may be impaired. Refer to the safety information in
Table 2.
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.
XWWARNING
To avoid possible electrical shock or 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 the Bath
Preparation and Filling section 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.

Calibration Bath
Before You Start
3
•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.
•DO NOT operate high temperature baths (500 °C) near
flammable materials. Extreme temperatures could ignite the
flammable material.
•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. This bath is not designed to be
portable. Therefore, moving the bath once it has been
installed should be kept to a minimum. Position the bath
before the tank is filled with fluid. DO NOT attempt to lift the
bath. Due to the weight of the compressor, it may require
four people to safely move the bath. The area containing the
compressor will be heavier than the rest of the bath.
•DO NOT move a bath filled with fluid. This action could be
extremely dangerous and could result in personal injury to
the person moving the bath. The fluid can splash causing
injury or if the bath and cart tip, the fluid could cause
damage to the surrounding area and personal injury to
personnel.
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.

7037/7038/7040/7041
User's Guide
4
ELECTRICAL HAZARD
•These guidelines must be followed to ensure that the safety
mechanisms in this instrument will operate properly. This
mains supply for the instrument must be capable of the
power requirements for the instrument as listed in the
Specifications section. The power cord of the instrument is
equipped with a three-pronged grounding plug for your
protection against electrical shock hazards. It must be
plugged directly into a properly grounded three-prong
receptacle. The receptacle must be installed in accordance
with local codes and ordinances. Consult a qualified
electrician.
•DO NOT use an extension cord or adapter plug.
•DO use a ground fault interrupt device. This instrument
contains a fluid. A ground fault device is advised in case
fluid is present in the electrical system and could cause an
electrical shock
•Always replace the power cord with an approved cord of the
correct rating and type. If you have questions, contact an
Authorized Service Center. See the How to Contact Fluke
Calibration section.
•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 the Bath Fluid section, for specific
information on bath fluids and the Cutout section.

Calibration Bath
Before You Start
5
Cautions
WCAUTION
•Always operate the instrument in room temperatures listed in
the Environmental Conditions section. Allow sufficient air
circulation by leaving at least 15 cm (6 inches) of clearance
around the instrument.
•DO NOT overfill the bath. Overflowing fluid may damage the
electrical system. See the Bath Preparation and Filling section,
for specific instructions.
•Read the Bath Use section, before placing the bath into
service.
•DO NOT turn the bath on without fluid in the tank.
•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 refrigeration may be damaged or the lifetime shortened if
the set-point temperature is set above 60 °C for more than one
hour with the refrigeration manually on. Ensure that the
refrigeration is off when the bath is used above 60 °C.
•The Factory Reset Sequence should be performed only by
authorized personnel if no other action is successful in
correcting a malfunction. You must have a copy of the most
recent Report of Test to restore the test 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.

7037/7038/7040/7041
User's Guide
6
COLD BATHS
•Refrigerated baths require that the condensing coil be cleaned
periodically. Accumulation of dust and dirt on the condenser
will result in premature failure of the compressor.
•This bath has been equipped with a brownout and over voltage
protection device as a safety feature to protect the system
components.
•Mode of Operation: This bath needs to be plugged into the line
voltage for at least 2 minutes before operation. This is only
necessary for the first time the bath is energized or when it is
moved from one location to another. Turning the bath ON or
OFF does not trigger the delay.
•If a High/Low voltage condition exists for longer than
5 seconds, the bath de-energizes. An amber indicator on the
back panel lights when this condition exists.
•Re-energization is automatic upon correction of the fault
condition and after a delay cycle of about 2 minutes. If a fault
condition exists upon application of power, the bath will not
energize.
oUnder and Over Voltage Protection at 115 VAC
oVoltage Cutout: ±12.5% (101 - 129 VAC)
oVoltage Cut In: ±7.5% (106 - 124 VAC)
oUnder and Over Voltage Protection at 230 VAC
oVoltage Cutout: ±12.5% (203 - 257 VAC)
oVoltage Cut In: ±7.5% (213 - 247 VAC)
How to Contact Fluke Calibration
To contact Fluke Calibration, call one of the following telephone numbers:
•Technical Support USA: 1-877-355-3225
•Calibration/Repair USA: 1-877-355-3225
•Canada: 1-800-36-FLUKE (1-800-363-5853)
•Europe: [phone]
•Japan: [phone]
•Singapore: [phone]
•China: [phone]
•Brazil: [phone]
•Anywhere in the world: [phone]

Calibration Bath
Product Introduction
7
To see product information and download the latest manual supplements, visit Fluke
Calibration’s website at www.flukecal.com.
To register your product, visit http://flukecal.com/register-product.
When contacting Fluke Calibration, please have the following information:
•Model Number
•Serial Number
•Voltage
•Complete description of the problem
Product Introduction
The Fluke Calibration Model 7037/7038/7040/7041 are very precise constant
temperature baths. An innovative state of the art solid-state temperature
controller has been incorporated which maintains the bath temperature with
extreme stability. The controller uses a microcontroller to execute the many
operating functions.
User interface is provided by the 8-digit LED display and four key-switches.
Digital remote communications is optionally available with a RS-232 or IEEE-488
interface.
There are two lids available for the 7037 and 7040 baths; the standard lid with a
rectangular access hole and an optional lid with a recirculation pump (see
Figure 5).
figure 1.eps
Figure 1. Bath Assembly

7037/7038/7040/7041
User's Guide
8
Specifications
Specifications 7037 7038 7040 7041
Operating Range –40°C to
110°C
–10°C to
110°C
–40°C to 110°C
Stability ±0.002°C at -40°C (ethanol)
±0.0015°C at 25°C (water)
±0.003°C at 100°C (oil 5012)
Uniformity ±0.004°C at -40°C (ethanol)
±0.002°C at 25°C (water)
±0.004°C at 100°C (oil 5012)
Temperature Digital display with push-button data entry
Set-Point 0.01°C; high-resolution mode, 0.00007°C
Display 0.01°C
Digital Setting
Accuracy
±1.0°C
Digital Setting
Repeatability
±0.01°C
Heater Power 500 and 1000 Watts
Power 115 VAC (±10%), 60 Hz, 2000 W
230 VAC (±10%), 60 Hz, 2000 W
230 VAC (±10%), 50 Hz, 2000 W
Note: If voltage is outside ±10% VAC, the compressor may be damaged. Check the
back panel label for the correct voltage and frequency prior to energizing the
instrument.
System Fuse 115 VAC: 20 A 250 V slow blow
230 VAC: 10 A 250 V slow blow
Heater Fuse 115 VAC: 10 A 250 V fast blow
230 VAC: 6 A 250 V fast blow
Work Area
(HxWxD)
45.7 x 29.2 x
16.2 cm
(18 x 11.5 x
6.375
45.7 x 25.4 x
12.7 cm
(18 x 10 x 5
inches)
30.5 x 25.4 x 12.7 cm
(12 x 10 x 5 inches)
33 x 32.4 x 18.4 cm
(13 x 12.75 x 7.25
inches)
Tank Capacity 41.6 liters 56.6 liters 26.5 liters (7 gal) 39.3 liters (10.4 gal)
Wetted Parts 304 stainless steel
Exterior
Dimensions
(HxWxD)
77.5 x 76.8 x 48.3 cm
(30.5 x 30.25 x 19 inches)
62.2 x 76.8 x 48.3 cm
(24.5 x 30.25 x 19 inches)
Weight 68 kg (150 lbs) 63.5 kg (140 lbs)
Safety OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC61010-1

Calibration Bath
Quick Start
9
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:
•ambient temperature range: 5 – 50 °C (41 – 122 °F)
•ambient relative humidity: maximum 80% for temperature <31°C, decreasing
linearly to 50 % at 40 °C
•pressure: 75 kPa – 106 kPa
•mains voltage within ± 10 % of nominal
•vibrations in the calibration environment should be minimized
•altitude less than 2,000 meters
•indoor use only
Quick Start
WCaution
READ the Bath Use section before placing the bath in service.
Incorrect handling can damage the bath and void the warranty.
This section gives a brief summary of the steps required to set up and operate
the bath. This should be used as a general overview and reference and not as a
substitute for the remainder of the manual. Please read Installation through
General Operation carefully before operating the bath.
Unpacking
Unpack the 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 all components are present:
•7037/7038/7040/7041 Bath
•Controller Probe
•Access Hole Cover
•User’s Guide
•Report of Test
•Drain Elbow
If you are missing any item, please contact Fluke Calibration.

7037/7038/7040/7041
User's Guide
10
Set Up
Set up of the bath requires careful unpacking and placement of the bath, filling
the bath with fluid, installing the probe and connecting power. Consult the
Installation section for detailed instructions for proper installation of the bath. Be
sure to place the bath in a safe, clean and level location.
Fill the bath tank with an appropriate liquid. For operation at moderate bath
temperatures, clean distilled water works well. Carefully pour the fluid into the
bath tank through the large rectangular access hole above the tank avoiding
spilling any fluid. The fluid must not exceed a height of 1/2 inch below the bath
lid.
The control probe must be inserted through the lid into the bath and plugged into
the socket at the back of the bath.
Power Plug the bath power cord into a mains outlet of the proper voltage, frequency,
and current capability (see the Specifications section). Refer to and read the
Caution at the front of the manual concerning brownout and over voltage
protection.
WCaution
Check the back panel label for the correct voltage and
frequency prior to energizing the unit.
Set the “HEATER” switch on the front panel to position “LOW” and turn the bath
on using the front panel “POWER” switch. The bath will turn on and begin to heat
or cool to reach the previously programmed temperature set-point. The front
panel LED display will indicate the actual bath temperature.
Set the Temperature
In the following discussion a solid box around the word SET, UP, EXIT or DOWN
indicates the panel button while the dotted box indicates the display reading.
Explanation of the button or display reading are to the right of each button or
display value.
To view or set the bath temperature set-point proceed as follows. The front panel
LED display normally shows the actual bath temperature.
Bath temperature display
When “SET” is pressed the display shows the set-point memory that is currently
being used and its value. Eight set-point memories are available.
Access set-point selection
Set-point 1, 25.0 °C currently used
24.68 C
1. 25.0