Thermo Scientific PRECISION 2878 Manual

Installation/Service Manual
Chiron Circulating Water Baths
Model 2878 (120V)
Model 2879 (230V)
401MillcreekRoad
Marietta,Ohio45750
USA
Phone:[phone]
TollFree: 800-438-4851
FAX:[phone]
ManualP/N3183922(36100178)
Rev.D Dated15APR09
High Temp. Off
On

NOTICE
THE MATERIAL IN THIS MANUAL IS FOR INFORMATION PURPOSES ONLY. THE
CONTENTS AND THE PRODUCT IT DESCRIBES ARE SUBJECT TO CHANGE WITHOUT
NOTICE.THERMOSCIENTIFICMAKESNOREPRESENTATIONSORWARRANTIESWITH
RESPECT TO THIS MANUAL. IN NO EVENT SHALL THERMO BE LIABLE FOR ANY
DAMAGES,DIRECTORINCIDENTAL,ARISINGOUTOFORRELATEDTOTHEUSEOFTHIS
MANUAL.
Forrepairinformationorreplacementpartsassistancefromthemanufacturer,callTechnicalServicesusingourtoll
freetelephonenumber.
800-438-4851
(FAX)740-373-4189

INDEX DATE NOTES
REVISION STATUS
Initial releaseA
AMENDED PAGES
4/04
Updatewarrantyinfo
RemovedScreenAssemblyOption
andother changes ECR 22856
ECR25448/BA-670
B
C
D
9/04
10/05
4/09
27
--
ULrequiredinfo

Contents
INTRODUCTION.................................................................................................................. 1
UNPACKING AND DAMAGE .............................................................................................. 1
GENERAL INFORMATION.................................................................................................. 2
PERFORMANCE................................................................................................................. 2
INSTALLATION ................................................................................................................... 2
WATER LEVEL REGULATOR ........................................................................................... 3
EXPLANATION OF CONTROLS ........................................................................................ 5
OPERATION ........................................................................................................................ 6
MAINTENANCE................................................................................................................... 7
TROUBLESHOOTING ........................................................................................................ 7
PARTS REPLACEMENT .................................................................................................. 12
TEMPERATURE CALIBRATION ...................................................................................... 15
REPLACEMENT PARTS LIST ......................................................................................... 16
ASSEMBLY & SCHEMATIC DWGS ................................................................................. 18
WARRANTY ...................................................................................................................... 27

1
UNPACKING AND DAMAGE
Save all packing material until unit is put into
service. This merchandise was carefully packed
andthoroughlyinspectedbeforeleavingourfactory.
Responsibility for safe delivery was assumed by
the carrier upon acceptance of the shipment;
therefore, claims for loss or damage sustained in
transit must be made upon the carrier by the
recipient as follows:
1. Visible Loss or Damage: Note any external
evidenceofloss or damageonthefreight bill,
or express receipt, and have it signed by the
carrier'sagent. Failuretoadequatelydescribe
such external evidence of loss or damage
may result in the carrier's refusing to honor
your damage claim. The form required to file
such claim will be supplied by the carrier.
2. Concealed Loss or Damage: Concealed
lossordamagemeansloss or damage which
does not become apparent until the
merchandise has been unpacked and
inspected. Shouldeitheroccur,makeawritten
requestforinspectionbycarrier'sagentwithin
fifteen (15) days of the delivery date; then file
a claim with the carrier since the damage is
the carrier's responsibility.
If you follow the above instructions carefully, we
will guarantee our full support of your claim to be
compensated for loss or concealed damage.
DONOT—FORANYREASON—RETURNTHIS
UNIT WITHOUT FIRST OBTAINING
AUTHORIZATION. In any correspondence to
THERMO, please supply the nameplate data,
including catalog number and serial number.
INTRODUCTION
Your satisfaction and safety are important to
THERMO and a complete understanding of this
unit is necessary to attain these objectives.
As the user of this apparatus, you have the
responsibility to understand the proper function
and operational characteristics of your bath. This
instruction manual should be thoroughly read and
all operators given adequate training before
attemptingtoplacethisunit inservice. Awareness
of the stated cautions and warnings, and
compliance with recommended operating
parameters — together with maintenance
requirements — are important for safe and
satisfactoryoperation. Theunitshouldbeusedas
described in this manual and for its intended
purpose; alterations or modifications will VOID
THE WARRANTY.
WARNING
AS A ROUTINE LABORATORY PRECAUTION,
ALWAYS WEAR SAFETY GLASSES WHEN
WORKING WITH THIS APPARATUS.
Thisproductisnotintended,nor canitbeused,as
a sterile or patient connected device. In addition,
this apparatus is not designed for use in Class I, II
orIIIlocationsasdefinedbytheNationalElectrical
Code.

2
PERFORMANCE DATA
Thefollowing table identifiesthespecificationsfor
the Circulating Baths.
INSTALLATION
WARNING
INSTALLATION SHOULD BE COMPLETED BY
QUALIFIED PERSONNEL ONLY.
Location-Themostuniformoperatingconditions
will be obtained by placing the bath on a level
surface in an area remote from drafts, ventilating
outlets, radiators, and other rapidly changing
ambient conditions.
Environmental Conditions- This instrument is
designed to operate safely under the following
conditions:
• Indoor Use Only
• Temperature: 5° to 40°C
• Maximum Relative Humidity: 80% for
temperatures to 22°C
• Maximum Altitude 2000 meters
• Mains supply voltage fluctuation ±10, or
per project plan
• Installation (Overvoltage) category II1,
Pollution Degree 22
1Installationcategory (overvoltagecategory)defines
thelevel of transient overvoltage which the instrument
is designed to withstand safely. It depends on the
natureof the electricity supply and its overvoltage
protection means. For example, in CAT II which is
the category used for instruments in installations
supplied from a supply comparable to public mains
such as hospital and research laboratories and most
industriallaboratories, theexpected transient
overvoltageis 2500Vfor a 230V supply and 1500V for
a120V supply.
2 Pollution Degree describes the amount of
conductivepollution present in the operating
environment.Pollution Degree2 assumesthat
normallyonly non-conductivepollution suchas dust
occurswith the exceptionof occasional conductivity
causedby condensation.
GENERAL INFORMATION
Precision Circulating Baths are widely used in
research and quality control. Their superb
temperature uniformity and stability makes them
especially desirable for legal or reference tests.
The microprocessor control panel houses all
functions necessary to operate the bath. The 5
push-button switches and single digital display
window allow the operator to adjust bath
temperatureandtemperaturecalibrationviaasingle
set of controls.
The proportional integral temperature control
coupled with agitation supplied by a centrifugal
pumplocatedinthecontrolhousingallowsprecise
temperaturecontrol. Useofthegablecoverprovided
is required to maintain optimal temperature
sensitivity.
A high limit thermostat is provided and can be set
to prevent heater runaway in the event of
temperature control failure.
The interior of the bath is constructed of stainless
steel and is designed for operation with distilled
water or water solutions, such as water /ethylene
glycolwithcorrosioninhabitantsadded. Thebody
is made from galvanized steel and is painted for
added protection. A drain is located at the far left
handendofthebath. Astainlesssteelgablecover
is also provided with the bath.
The 230-volt units are identical in appearance to
the 120-volt units.
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3
WATER LEVEL REGULATOR
(OPTIONAL)
INSTALLATION INSTRUCTIONS - Use the
following steps along with Fig. 1 & 2 shown on the
followingpage.
1. Turn off unit, disconnect power & drain water
from the bath.
2. Unscrew drain plug from side of bath body.
3. Replacewithelbowconnector(shippedloose).
NOTE
TO INSURE GOOD SEAL, WRAP THREADS
WITH TEFLON TAPE OR EQUIVALENT
SEALER.
4. Tighten elbow connector so open end (tube
fitting) faces straight down.
5. PlaceWaterLevelRegulatorBkt.Ass'yonthe
lip of the bath pan (drain side of the bath
towards the rear of the unit). The small flange
with gasketing near the top of the bracket
should rest against the inside of the bath pan.
The other 2 flanges with gasketing should
rest against the outside of the bath body.
6. Insert the plastic tubing (coming from the
bottom of the water level regulator) into the
elbow connector (at the drain) & tighten the
elbow connector fitting firmly to insure a good
seal.
7. Uncoil Tygon tubing & press onto 1/4" Hose
Barb Fitting (located at the top of water level
regulator).
8. Hook-upotherendofthetygontubingtowater
supply&turnonwater.(Waterpressureshould
fallwithinthefollowingrange:MINisapprox.15
PSI,MAX isapprox 75PSI)
ELECTRICAL CONNECTIONS
IMPORTANT
Forpersonalsafety,thisapparatusmustbe
properlygrounded.
1. Thepowercordprovidedonthisunitisequipped
with a three-prong (grounding) plug which
mates with standard three-prong grounding
wall receptacle to minimize the possibility of
electric shock hazard from this apparatus. If
in doubt, the user should have the wall
receptacle and circuit checked by a qualified
electrician to make sure the receptacle can
provide adequate current and is properly
grounded.
The power cord is the MAINS disconnect.
Make sure the receptacle is easily accessible
afterinstallation.
2. Where a standard two-prong wall receptacle
isencountered,itisthepersonalresponsibility
and obligation of the user to have it replaced
with a properly grounded three-prong wall
receptacle. Donot,underanycircumstances,
cut or remove the third (ground) prong from
thepowercord.Donotuseatwo-prongadapter
plug.
Determine the total amount of current being used
byotherapparatusconnectedtothecircuitthatwill
be used for this apparatus. It is critical that the
addedcurrentdemand(seenameplate)ofthisand
otherequipmentusedonthesamecircuitdoesnot
exceed the rating of the fuse or circuit breaker.
CAUTION
BE SURE THAT THE POWER SUPPLY IS OF
THE SAME VOLTAGE AS SPECIFIED ON THE
NAMEPLATE.
TO AVOID BUILD-UP OF MINERAL DEPOSITS
AND TO PREVENT CORROSION, USE ONLY
DISTILLED WATER (50K TO 1M OHMS) IN THE
BATH.DONOTUSEDEIONIZEDWATER,OVER
TIME, IT BECOMES CORROSIVE AND WILL
ATTACK STAINLESS STEEL. IF DEIONIZED
WATER IS THE ONLY TYPE AVAILABLE, THEN
USE A MIXTURE OF WATER WITH A RATIO OF
50%DEIONIZEDWATERAND50%TAPWATER.
ELECTROLYSIS CAN DAMAGE STAINLESS
STEEL. THIS CAN OCCUR IF AN OBJECT IS
ALLOWED TO REST DIRECTLY ON THE
SURFACE, TRAPPING MOISTURE THAT
BECOMES OXYGEN STARVED BUT IS
SURROUNDED BY WATER CONTAINING

4
WATER LEVEL REGULATOR ASSEMBLY
FIGURE 1
SIDE VIEW OF BATH
FIGURE 2
CUTAWAY FRONT VIEW OF BATH
NOTE
WATER LINE
MARKING ON THE
WATER LEVEL
REGULATOR IS AN
INDICATOR OF THE
APPROX. WATER
LEVEL THAT WILL BE
MAINTAINED IN BATH.
THE ASS'Y HAS BEEN
SET TO MAINTAIN
APPROX. 1-3/4" OF
WATER. TO RAISE
THE SET WATER
LEVEL, LOOSEN
THUMBSCREW &
RAISE WATER LEVEL
REGULATOR TO
DESIRED LEVEL
(COINCIDE WITH
WATER LINE MARK) &
TIGHTEN
THUMBSCREW TO
HOLD WATER LEVEL
REGULATOR IN
PLACE.
NOTE:
DO NOT
OVER-TIGHTEN
THUMBSCREW

5
1
2
4
3
5
67
FIGURE A
EXPLANATION OF CONTROLS
Power Switch - The power switch is located on
the lower right hand side of the bath, it provides
power for the entire unit.
Hi-Limit Thermostat - is located immediately to
theleftofthepowerswitchonthelowerrighthand
cornerofthe bath. The highlimitis an adjustable
control used to prevent thermal runaway in the
event that the primary control fails. After the bath
temperature has been stabilized, use a standard
screwdriver to adjust the potentiometer. When
delivered, the Hi-Limit is turned fully clockwise
(highest setting). In this position the Hi-Limit light
will be OFF. Turn the potentiometer
counterclockwise until the Hi-Limit light is ON,
then adjust
clockwise 1/8 of
aturn.Verifythat
the Hi-Limit light
is OFF. Now if
your bath
temperature
rises above the
desired setting,
the Hi-Limit
protectionwillbe
activated.
Control Panel
The Control
panel is located
ontopofthebath
andprovidespri-
mary tempera-
ture control. The
Control Panel
contains the fol-
lowing features
(See Figure A)
1. LED Display
4-digit display used to show both actual and set
point values for the temperature. Also shows
configuration parameters when in configuration
mode.
2. Heater on Lamp - the Heater on Lamp is
lighted when power is applied to the heating
element.
3. Indicator Lamps - These lamps indicate
which parameter (Actual Temp or Setpoint Temp)
is displayed in LED window.
4. Set Point Key - The Set Point Key is used to
toggle the display between actual bath
temperature and the setpoint value.
5. Temperature
Selection Keys
The Temperature
Selection Keys
are used to
select the de-
sired tempera-
ture setpoint
value and
are only active
after theSet Point
Key has been
pressed.
6. Enter Key -
The Enter Key
is used to store
a new set point
value.
7. Offset Key -
The Offset Key
is used to adjust
the actual
temperature
value to match
a calibrated
reference
thermometer.
OXYGEN. THE
RESULTING
ELECTROLYTIC
ACTION WILL
PIT OR ERODE
THE
STAINLESS
STEEL.