Fluke 7312 User manual

7312
Triple Point of Water Maintenance Bath
User’s Guide
March 2013
© 2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
Via Acquanera, 29 22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
[e-mail] www.calpower.it

6.3 Comparison Calibration . . . . . . . . . . . . . . . . . . . . . . . 27
6.4 Calibration of Multiple Probes . . . . . . . . . . . . . . . . . . . 27
7 Parts and Controls . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2 Bath Tank and Lid. . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.3 Back Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8 General Operation . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1 Heat Transfer Fluid . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1.1 Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1.2 Viscosity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1.3 Specific Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1.4 Thermal Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.1.5 Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.1.6 Electrical Resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1.7 Fluid Lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1.8 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1.9 Cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1.10 Commonly Used Fluids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1.10.1 Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1.10.2 Ethylene Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1.10.3 Mineral Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1.10.4 Silicone Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1.11 Fluid Characteristics Charts. . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.1.11.1 Limitations and Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.1.11.2 About the Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
8.2 Stirring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8.3 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.4 Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.5 Temperature Controller . . . . . . . . . . . . . . . . . . . . . . . 38
8.6 Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9 Controller Operation . . . . . . . . . . . . . . . . . . . . . . . 41
9.1 Bath Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.2 Reset Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.3 Temperature Set-point . . . . . . . . . . . . . . . . . . . . . . . . 43
9.3.1 Programmable Set-points . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.3.2 Set-point Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.3.3 Set-point Vernier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.4 Temperature Scale Units . . . . . . . . . . . . . . . . . . . . . . 45
9.5 Secondary Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . 46
9.6 Heater Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
9.7 Proportional Band . . . . . . . . . . . . . . . . . . . . . . . . . . 46
ii

9.8 Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.9 Controller Configuration . . . . . . . . . . . . . . . . . . . . . . 50
9.10 Probe Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.10.1 D0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.10.2 DG. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.11 Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . 50
9.11.1 Cutout Reset Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.11.2 Triple Point of Water Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.12 Serial Interface Parameters . . . . . . . . . . . . . . . . . . . . . 52
9.12.1 BAUD Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.12.2 Sample Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.12.3 Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.12.4 Linefeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9.13 IEEE-488 Parameters . . . . . . . . . . . . . . . . . . . . . . . . 54
9.13.1 IEEE-488 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.13.2 Transmission Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
9.14 Calibration Parameters . . . . . . . . . . . . . . . . . . . . . . . 55
9.14.1 CTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9.14.2 H and L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
10 Digital Communication Interface . . . . . . . . . . . . . . . . 57
10.1 Serial Communications . . . . . . . . . . . . . . . . . . . . . . . 57
10.1.1 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
10.1.2 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.1.2.1 BAUD Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.1.2.2 Sample Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.1.2.3 Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.1.2.4 Linefeed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.1.3 Serial Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.2 IEEE-488 Communication (optional) . . . . . . . . . . . . . . . . 59
10.2.1 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
10.2.1.1 IEEE-488 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
10.2.1.2 Transmission Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
10.2.2 IEEE-488 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
10.3 Interface Commands . . . . . . . . . . . . . . . . . . . . . . . . 60
10.4 Power Control Functions . . . . . . . . . . . . . . . . . . . . . . 63
11 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . 65
11.1 Calibration Points—2 Point Calibration. . . . . . . . . . . . . . . 65
11.2 Measuring the Set-point Error. . . . . . . . . . . . . . . . . . . . 65
11.3 Computing DO and DG . . . . . . . . . . . . . . . . . . . . . . . 65
11.4 Calibration Example. . . . . . . . . . . . . . . . . . . . . . . . . 66
11.5 Single Point Calibration . . . . . . . . . . . . . . . . . . . . . . . 66
11.6 Measuring the Set-point Error. . . . . . . . . . . . . . . . . . . . 67
iii

11.7 Computing D0. . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
11.8 Calibrating the Triple Point of Water Cutout . . . . . . . . . . . . 68
12 Charging Instructions . . . . . . . . . . . . . . . . . . . . . . 71
12.1 Leak Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
12.2 Evacuation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
12.3 Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
13 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
14 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . 75
14.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
14.2 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
14.2.1 EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
14.2.2 Low Voltage Directive (Safety) . . . . . . . . . . . . . . . . . . . . . . . . . 78
iv

v
Figures and Tables
Figure 1 Drain Valve Installation—IMPORTANT: Do Not Over Tighten.
Follow the installation instructions above. . . . . . . . . . . . . . . . . 18
Figure 2 Details of the Access Cover and Cell Racks . . . . . . . . . . . . . . . 23
Figure 3 Fluid Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 4 Location of Handles for NBS Design Cells . . . . . . . . . . . . . . . 26
Figure 5 Front Controller Panel . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 6 Chart of Various Bath Fluids and Their Properties . . . . . . . . . . . 37
Figure 7 Controller Operation Flowchart . . . . . . . . . . . . . . . . . . . . . 42
Figure 8 Bath Temperature Fluctuation at Various Proportional Band Settings . . 47
Figure 9 Serial Communications Cable Wiring . . . . . . . . . . . . . . . . . . 58
Figure 10 Sample Calibration Computations . . . . . . . . . . . . . . . . . . . . 67

vi
Tables
Table 1 International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1
Table 2 Table of Various Bath Fluids and Their Properties. . . . . . . . . . . . 36
Table 3 Proportional Band - Fluid Table . . . . . . . . . . . . . . . . . . . . . 48
Table 4 Interface Command Summary.. . . . . . . . . . . . . . . . . . . . . . 61
Table 4 Interface Command Summary continued . . . . . . . . . . . . . . . . 62

1 Before You Start
1.1 Symbols Used
Table 1 lists the International Electrical Symbols. Some or all of these symbols
may be used on the instrument or in this manual.
Symbol Description
AC (Alternating Current)
AC-DC
Battery
CE Complies with European Union Directives
DC
Double Insulated
Electric Shock
Fuse
PE Ground
Hot Surface (Burn Hazard)
Read the User’s Manual (Important Information)
Off
On
1
1 Before You Start
Symbols Used
Table 1 International Electrical Symbols

Symbol Description
Canadian Standards Association
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 re-
fers to the level of Impulse Withstand Voltage protection provided. Equipment of
OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from
the fixed installation. Examples include household, office, and laboratory appliances.
C-TIC Australian EMC Mark
The European Waste Electrical and Electronic Equipment (WEEE) Directive
(2002/96/EC) mark.
1.2 Safety Information
Use this instrument only as specified in this manual. Otherwise, the protection
provided by the instrument may be impaired.
The following definitions apply to the terms “Warning” and “Caution”.
•“WARNING” identifies conditions and actions that may pose hazards to
the user.
•“CAUTION” identifies conditions and actions that may damage the in-
strument being used.
1.2.1 WARNINGS
To avoid possible electric 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 unit may cause unknown hazards to the user.
•DO NOT use the unit in environments other than those listed in the user’s
guide.
•DO NOT overfill the bath. Overflowing extremely cold or hot fluid may
be harmful to the operator. See Section 5.3, Bath Preparation and Filling,
for specific instructions.
•Follow all safety guidelines listed in the user’s manual.
•Calibration Equipment should only be used by Trained Personnel.
•If this equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
•Before initial use, or after transport, or after storage in humid or semi-hu-
mid environments, or anytime the instrument has not been energized for
more than 10 days, the instrument needs to be energized for a "dry-out"
7312 TPW Maintenance Bath
User’s Guide
2

period of 2 hours before it can be assumed to meet all of the safety re-
quirements of the IEC 1010-1. If the product is wet or has been in a wet
environment, take necessary measures to remove moisture prior to apply-
ing power such as storage in a low humidity temperature chamber operat-
ing at 50 degree centigrade for 4 hours or more.
•DO NOT operate high temperature baths (500°C) near flammable materi-
als. Extreme temperatures could ignite the flammable material.
•Overhead clearance is required. Do not place the instrument under a cabi-
net or other structure. Always leave enough clearance to allow for safe
and easy insertion and removal of probes.
•The instrument is intended for indoor use only.
BURN HAZARD
•Extremely cold temperatures may be present in this equipment. Freezer
burns and frostbite may result if personnel fail to observe safety precau-
tions.
•High temperatures may be present in this equipment. Fires and severe
burns may result if personnel fail to observe safety precautions.
ELECTRICAL HAZARD
•These guidelines must be followed to ensure that the safety mechanisms
in this instrument will operate properly. This instrument must be plugged
into a 115 VAC, 60Hz (230 VAC, 50Hz optional), AC only electric outlet.
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 ordi-
nances. Consult a qualified electrician. DO NOT use an extension cord or
adapter plug.
•DO use a ground fault interrupt device. This unit contains a liquid. A
ground fault device is advised in case liquid is present in the electrical
system and could cause an electrical shock.
•Always replace the power cord with an approved cord of the correct rat-
ing and type. If you have questions, contact a Hart Scientific Authorized
Service Center (see Section 1.3).
•High voltage is used in the operation of this equipment. Severe injury or
death may result if personnel fail to observe the safety precautions. Before
working inside the equipment, turn off the power and disconnect the
power cord.
BATH FLUIDS
•Fluids used in this unit 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.
3
1 Before You Start
Safety Information

•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 unit opera-
tion. Ensure that the soft cutout is adjusted to the fluid characteristics of
the application. As a guideline, the soft cutout should be set 10°C to 15°C
below the flash point of the bath fluid. See Section 8.1, Heat Transfer
Fluid, for specific information on bath fluids and Section 9.8, Cutout.
1.2.2 CAUTIONS
To avoid possible damage to the instrument, follow these guidelines.
•THE DRAIN VALVE MUST BE INSTALLED ON THE BACK OF
THE BATH BEFORE ATTEMPTING TO FILL THE TANK WITH
FLUID. See Section 5.3, page 17 for drain installation instructions.
•Always operate this instrument at room temperature between 41°F and
122°F (5°C to 50°C). Allow sufficient air circulation by leaving at least 6
inches (15 cm) of clearance around the instrument.
•DO NOT overfill the bath. Overflowing liquid may damage the electrical
system. Be sure to allow for thermal expansion of the fluid as the bath
temperature increases. See Section 5.3, Bath Preparation and Filling, for
specific instructions.
•Read Section 7, Bath Use, before placing the unit into service.
•DO NOT change the values of the bath calibration constants from the fac-
tory set values. The correct setting of these parameters is important to the
safety and proper operation of the unit.
•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
unit is used above 60°C.
•The Factory Reset Sequence should be performed only by authorized
personnel if no other action is successful in correcting a malfunction. You
must have a copy of the most recent Report of Test to restore the test pa-
rameters.
•DO NOT operate this instrument in an excessively wet, oily, dusty, or
dirty environment.
•The unit is a precision instrument. Although it has been designed for opti-
mum durability and trouble free operation, it must be handled with care.
Position the unit before the tank is filled with fluid. Use the handles pro-
vided to move the unit. Due to the weight of the compressor, it may re-
quire two people to safely move the bath. If two people are used, place
one person in the front and one person in the back of the unit, carefully
slide hands under the unit and lift in unison. The area containing the com-
pressor will be heavier than the rest of the unit. Do not move a unit filled
with fluid.
7312 TPW Maintenance Bath
User’s Guide
4

•Most probes have handle temperature limits. Be sure that the probe handle
temperature limit is not exceeded in the air above the instrument.
•The instrument and any thermometer probes used with it are sensitive in-
struments that can be easily damaged. Always handle these devices with
care. Do not allow them to be dropped, struck, stressed, or overheated.
COLD BATHS
•Refrigerated baths require that the condensing coil be cleaned periodi-
cally. Accumulation of dust and dirt on the condenser will result in pre-
mature failure of the compressor.
•This bath has been equipped with a brownout and over voltage protection
device as a safety feature to protect the system components.
•Mode of Operation: This bath needs to be plugged into the line voltage
for at least 2 minutes before operation. This is only necessary for the first
time that 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 con-
dition exists.
•Re-energization is automatic upon correction of the fault condition and af-
ter a delay cycle of about 2 minutes. If a fault condition exists upon appli-
cation of power, the bath will not energize.
•Under and Over Voltage Protection at 115 VAC
♦Voltage Cutout: ±12.5% (101 - 129 VAC)
♦Voltage Cut In: ±7.5% (106 - 124 VAC)
•Under and Over Voltage Protection at 230 VAC
♦Voltage Cutout: ±12.5% (203 - 257 VAC)
♦Voltage Cut In: ±7.5% (213 - 247 VAC)
1.3 Authorized Service Centers
Please contact one of the following authorized Service Centers to coordinate
service on your Hart product:
Fluke Corporation, Hart Scientific Division
799 E. Utah Valley Drive
American Fork, UT 84003-9775
USA
Phone: [phone]
Telefax: +1.801.763.1010
5
1 Before You Start
Authorized Service Centers

E-mail: [email protected]
Fluke Nederland B.V.
Customer Support Services
Science Park Eindhoven 5108
5692 EC Son
NETHERLANDS
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
Fluke Int'l Corporation
Service Center - Instrimpex
Room 2301 Sciteck Tower
22 Jianguomenwai Dajie
Chao Yang District
Beijing 100004, PRC
CHINA
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
Fluke South East Asia Pte Ltd.
Fluke ASEAN Regional Office
Service Center
60 Alexandra Terrace #03-16
The Comtech (Lobby D)
118502
SINGAPORE
Phone: [phone]
Telefax: [phone]
E-mail: [email protected]
When contacting these Service Centers for support, please have the following
information available:
•Model Number
7312 TPW Maintenance Bath
User’s Guide
6

•Serial Number
•Voltage
•Complete description of the problem
7
1 Before You Start
Authorized Service Centers

2 Introduction
The Hart Scientific Model 7312 is a floor standing constant temperature bath.
This bath is useful in maintaining up to two triple point of water cells, perform-
ing temperature calibration, and other applications requiring stable tempera-
tures. An innovative state of the art solid-state temperature controller has been
incorporated which maintains the bath temperature with extreme stability. The
temperature controller uses a micro controller to execute the many operating
functions.
User interface is provided by the 8-digit LED display and four key-switches.
Digital remote communications is standard with an RS-232 serial interface and
optional with an IEEE-488 interface.
Temperature cutouts protect triple point of water cells from freezing or high
temperatures due to system failure. Separate circuits cut off heating or refriger-
ation independent of the temperature controller.
This bath was designed to be compact and low cost without compromising per-
formance. The bath operates over a wide temperature range from –5°C to
110°C. The refrigeration permits sub-ambient temperature control.
9
2 Introduction

3 Specifications and Environment
Conditions
3.1 Specifications
Range –5°C to 110°C
Stability ±0.001°C at 0°C (alcohol-water mix)
±0.004°C at 30°C (alcohol-water mix)
Uniformity ±0.003°C at 0°C (alcohol-water mix)
±0.006°C at 30°C (alcohol-water mix)
TPW Duration Six weeks, typical (assumes correctly formed ice mantle)
Set-Point Accuracy ±0.05°C at 0°C
Set-Point Repeatability ±0.01°C
Display Resolution ±0.01°C
Set-Point Resolution ±0.002°C; 0.00003°C in high-resolution mode
Access Opening 4.75” x 3.8”
(121 x 97 mm)
Immersion Depth 19.5” (496 mm)
Volume 5 gallons (19 liters)
Power 115 VAC (±10%), 60 Hz or
230 VAC (±10%), 50 Hz
Size 12” W x 24.5” W x 32.25” H (305 x 622 x 819 mm)
Weight 75 lb. (34 kg)
Automation Package Interface- it software and an RS-232 computer interface are available
for setting the bath temperature via an external computer. For
IEEE-488, add 2001-IEEE to the automation package.
Safety OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per
IEC1010-1
3.2 Environmental Conditions
Although the instrument has been designed for optimum durability and trou-
ble-free operation, it must be handled with care. The instrument should not be
operated in an excessively dusty or dirty environment. Maintenance and clean-
ing recommendations can be found in the Maintenance section of this manual.
The instrument operates safely under the following conditions:
•temperature range: 5-35°C (41-95°F)
•ambient relative humidity: maximum 80% for temperature <31°C, de-
creasing linearly to 50% at 40°C
•pressure: 75kPa – 106kPa
11
3 Specifications and Environment Conditions
Specifications

4 Quick Start
CAUTION: Read Section 6 entitled BATH USE before placing the bath in
service.
This chapter 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 Section 6, Installation,
through Section 9, General Operation, carefully before operating the bath.
4.1 Unpacking
Unpack the bath carefully and inspect it for any damage that may have oc-
curred during shipment. If there is shipping damage, notify the carrier immedi-
ately. Verify that all components are present:
•7312 Bath
•Access Hole Cover and Components.
•Triple Point of Water Support Racks and Adapters.
•User’s Guide
•Report of Test
•Drain Valve
If you are missing any item, please call an Authorized Service Center for
assistance.
4.2 Set Up
CAUTION: The drain valve must be installed on the back of the bath be-
fore attempting to fill the tank with fluid. See Section 5.3, on page 17 for
drain installation instructions.
WARNING: 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 unit operation. Ensure that the soft cutout is adjusted to the fluid
characteristics of the application. As a guideline, the soft cutout should be
set 10°C to 15°C below the flash point of the bath fluid. See Section 8.1,
Heat Transfer Fluid, for specific information on bath fluids and Section
9.8, Cutout.
Set up of the bath requires careful unpacking and placement of the bath, filling
the bath with fluid, and connecting power. Consult Section 6, Installation, for
13
4 Quick Start
Unpacking

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 above 0°C and below 70°C.
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 12.7-20.3 mm (0.5-0.8 inches) below the bottom of the lid (NOT the
access cover).
4.3 Power
Plug the bath power cord into a mains outlet of the proper voltage, frequency
and current capability. Refer to Section 3.1, Specifications, for power details.
Refer to and read the caution at the front of the manual concerning brownout
and over voltage protection. Check the back panel label for the correct voltage
and frequency prior to energizing the unit. Turn the bath on using the front
panel “POWER” switch. The baths turns on and begins to heat or cool to reach
the previously programmed temperature set-point. The front panel LED display
indicates the actual bath temperature. Set the cooling switch to “OFF” for tem-
perature above approximately 45°C. Set the switch to “ON” for lower
temperatures.
4.4 Setting the Temperature
In the following discussion and throughout this manual a solid box around the
word SET, UP, DOWN, or EXIT. Indicates the panel button to press while the
dotted box indicates the display reading on the front panel. Explanation of the
button function or display reading is written at the right.
To view or set the bath temperature set-point proceed as follows. The front
panel LED display normally shows the actual bath temperature.
24.68 C Bath temperature display
When the “SET” button is pressed the display shows the set-point memory that
is currently being used and its value. Eight set-point memories are available.
SAccess set-point selection.
Set-point 1, 25.0°C currently used
Press the “SET” button to select this memory and access the set-point value.
SAccess set-point value
C 25.00 Current value of set-point 1, 25.00°C
Press the “UP” or “DOWN” button to change the set-point value.
7312 TPW Maintenance Bath
User’s Guide
14