WATER BATHS
SWB30
SWB30-2
Previously Designated as
WPC95 & WPC95-2
MICROPROCESSOR CONTROLLED
INSTALLATION AND OPERATION MANUAL
4861564
Revised June 19, 2014
These units are TUV CUE listed as water baths for professional, industrial or educational use where the
preparation or testing of materials is done at approximately atmospheric pressure and no flammable,
volatile or combustible materials are being heated. These units have been tested to the following
requirements:
CAN/CSA C22.2 No. 61010-1:2012
CAN/CSA C22.2 No. 61010-2-010 + R:2009
UL 61010A-2-010:2002
UL 61010-1:2012
EN 61010-1:2010
EN 61010-2-010:2003
IEC 61010-1:2010
IEC 61010-2-010:2003
Sheldon Manufacturing Inc.
P.O. Box 627
Cornelius, Oregon 97113
EMAIL: tech@Shellab.com
INTERNET: http://www.Shellab.com
PHONE: 1-800-322-4897 (503) 640-3000
FAX: (503) 640-1366
2 Microprocessor Control Water Baths
3
TABLE OF CONTENTS
INTRODUCTION ........................................................................................................................................... 4
General Safety Considerations ........................................................................................................ 4
RECEIVING YOUR UNIT .............................................................................................................................. 5
Inspection Guidelines ....................................................................................................................... 5
Returning Shipment.......................................................................................................................... 5
Recording Data Plate Information .................................................................................................... 5
GRAPHIC SYMBOLS .................................................................................................................................... 6
INSTALLATION ............................................................................................................................................. 7
Environmental Conditions ................................................................................................................ 7
Power Source ................................................................................................................................... 7
Location ............................................................................................................................................ 7
Lifting and Handling .......................................................................................................................... 7
Cleaning and Decontamination ........................................................................................................ 7
CONTROLS OVERVIEW .............................................................................................................................. 8
Power Switch .................................................................................................................................... 8
Main Temperature Controller ........................................................................................................... 8
Fuses................................................................................................................................................ 8
Over Temperature Limit Thermostat (OTL) ..................................................................................... 8
Heating Activated ............................................................................................................................. 8
Over Temperature Activated Light ................................................................................................... 8
OPERATION ................................................................................................................................................. 9
Turning On the Unit .......................................................................................................................... 9
Setting Main Temperature Control ................................................................................................... 9
Calibrating the Main Temperature Control ....................................................................................... 9
Setting the Over Temperature Limit Thermostat ............................................................................ 10
Bath Cover Assembly ..................................................................................................................... 11
MAINTENANCE .......................................................................................................................................... 12
Cleaning ......................................................................................................................................... 12
Heating and Water Level ................................................................................................................ 12
Test-tube Racks ............................................................................................................................. 12
TROUBLESHOOTING ................................................................................................................................ 13
Service ........................................................................................................................................... 14
PARTS LIST ................................................................................................................................................ 15
UNIT SPECIFICATIONS ............................................................................................................................. 16
SCHEMATICS ............................................................................................................................................. 17
Microprocessor Control Water Baths
Section
1
INTRODUCTION
Thank you for choosing a general purpose water bath. These units are not intended for use at hazardous or
household locations.
Before you use the unit, read this entire manual carefully to understand how to install, operate, and maintain the unit
in a safe manner. Your satisfaction with the unit will be maximized as you read about its safety and operational
features.
Keep this manual on-hand so it can be used by all operators of the unit. Be sure all operators of the unit are given
appropriate training before you put the unit in service.
Note: Use the unit only in the way described in this manual. Failure to follow the guidelines and
instructions in this manual may be dangerous and illegal.
General Safety Considerations
Your water bath and its recommended accessories have been designed and tested to meet strict safety
requirements.
For continued safe operation of your water bath, always follow basic safety precautions including:
Read this entire manual before using the water bath.
Be sure you follow any city, county, or other ordinances in your area regarding the use of this unit.
Use only approved accessories. Do not modify system components. Any alterations or modifications
to your water bath may be dangerous and will void your warranty.
Always plug the unit’s power cord into a grounded electrical outlet that conforms to national and local
electrical codes. If the unit is not grounded, parts such as knobs and controls may conduct electricity
and cause serious injury.
Do not connect the unit to a power source of any other voltage or frequency beyond the range stated
on the power rating overlay at the rear of the unit.
Do not modify the power cord provided with the unit. If the plug does not fit an outlet, have a proper
outlet installed by a qualified electrician.
Avoid damaging the power cord. Do not bend it excessively, step on it, place heavy objects on it. A
damaged cord can easily become a shock or fire hazard. Never use a power cord after it has become
damaged.
Do not position equipment in a manner that prohibits access to power cord.
Do not attempt to move the unit while in operation or before the unit has been allowed to cool.
Microprocessor Control Water Baths 4
Model Number
Serial Number
Part Number
Voltage
Section
2
RECEIVING YOUR UNIT
Before leaving our factory, all units are packaged in high quality shipping materials designed to provide
protection from transportation related damage.
Once a unit leaves our factory, safe delivery becomes the responsibility of the carrier who is liable for loss
or damage to your unit. Damage sustained during transit is not covered under your unit warranty.
When you receive your unit, inspect it for concealed loss or damage to its interior and exterior. Should you
find any damage to the unit, follow the carrier’s procedure for claiming damage or loss.
Inspection Guidelines
Carefully inspect the shipping carton for damage. If the carton is damaged, report the damage to the
carrier service that delivered the unit.
If the carton is not damaged, open the carton and remove its contents. Verify that all of the following
equipment is included in the crate:
One (1) water bath unit
One (1) bath cover
One (1) magnetic thermometer clip
One (1) power cord
Carefully check all packaging before discarding. Save the shipping carton until you are sure everything is
in order.
Returning Shipment
If you must return the unit for any reason, first contact your service representative for authorization. You
will be asked to provide the data plate information. See Recording Data Plate Information.
Recording Data Plate Information
Once you have determined the unit is free from damage, locate the data plate at the back of the unit. The
data plate indicates your unit’s model number and serial number. Record this information below for future
reference.
Table 1. Data Plate Information
5 Microprocessor Control Water Baths
Symbol
Identification
Indicates that you should consult your operator’s manual for further instructions.
Indique que l'opérateur doit consulter le manuel d'utilisation pour y trouver les instructions
complémentaires.
Indicates “Temperature”
Repère "température"
Indicates “Over Temperature Protection”
Signale un "dépassement de température"
Indicates “AC Power”
Repère "secteur AC"
I
Indicates the power is “ON”
Repère de la position "MARCHE" de l'interrupteur d'alimentation
O
Indicates the power is “OFF”
Repère de la position "ARRÊT" de l'interrupteur d'alimentation
Indicates “Protective Earthground”
Repère de la "terre de protection"
Indicates “Up” and “Down” respectively
Touches de déplacements respectifs vers le "HAUT" et le "BAS"
Indicates “Manually Adjustable”
Signale un élément "réglable manuellement"
Indicates “Potential Shock Hazard” behind partition
Signale un "risque potentiel d'électrocution" au-delà de la cloison.
Indicates “Hot Surface”
Signale une “surface à haute température”
Indicates “Unit should be recycled” (Not disposed of in land-fill).
Indique “l’appareil doit être recyclé“ (Ne pas jeter dans une décharge)
Section
3
GRAPHIC SYMBOLS
Your unit is provided with a display of graphic symbols that should help in identifying user adjustable
components.
Table 2. Symbols
Microprocessor Control Water Baths 6
Section
4
INSTALLATION
Your satisfaction and safety require a complete understanding of this unit. Read the instructions
thoroughly and be sure all operators are given adequate training before attempting to put the unit in
service.
This equipment must be used only for its intended application; any alterations or modifications will void
your warranty. Local city, county, or other ordinances may govern the use of this equipment. If you have
any questions about local requirements, please contact the appropriate local agency. The end user may
perform installation.
Environmental Conditions
Under normal circumstances these units are intended for use indoors, at room temperatures between 18
and 40C, at no greater than 80% relative Humidity (at 25C) and with a supply voltage that does not vary
by more than 10% from the data plate rating. This equipment should not be operated at an altitude
exceeding 2000 meters. Installation category is II, pollution degree 2. Customer service should be
contacted for operating conditions outside of these limits.
Power Source
Check the data plate for voltage, cycle, and ampere requirements. If matched to your power source, plug
the power cord into a grounded outlet.
Voltage should not vary more than ± 10% from the data plate rating.
These units are intended for 50/60-HZ application. A separate circuit is recommended to prevent damage
to the unit due to overloading or circuit failure.
Location
In selecting a location, consider all conditions that might affect performance, such as heat from radiators,
ovens, autoclaves, etc. Avoid direct sun, fast-moving air currents, heating and cooling ducts, and high
traffic areas. Allow a minimum of 10 cm between the unit and any walls or partitions that might obstruct
free airflow.
Lifting and Handling
These units are heavy and care should be taken to use appropriate lifting devices that are sufficiently
rated for these loads. Units should only be lifted from their bottom surfaces. Handles and knobs are not
adequate for lifting or stabilization. The unit should be completely restrained from tipping during lifting or
transport. All moving parts such as trays or covers should be removed during transfer to prevent shifting
and damage.
Cleaning and Decontamination
In the event hazardous material is spilled onto or into the equipment appropriate decontamination must be
carried out. If there is any doubt about the compatibility of decontamination or cleaning agents with parts
of the equipment or with material contained, please contact the manufacturer. Units are cleaned at the
factory, but not sterilized. Remove any racks if assembled and clean the bath with a disinfectant that is
suitable for your application. See MAINTENANCE for cleaning instructions and precautions.
7 Microprocessor Control Water Baths
Section
5
CONTROLS OVERVIEW
This section provides an overview of the panel controls. See Figure 1 for an illustration of the panel
controls.
Figure 1. Control Panel
Power Switch
The Green I/O (On/Off) power switch, located in the top right hand corner of the control panel, controls all
power to the unit. It must be in the I position to be ON and illuminated before any systems are operational.
The on/off switch must remain easily accessible at all times.
Main Temperature Controller
This control is marked SET TEMPERATURE and consists of the digital display and UP and DOWN arrow
pads for inputting set point temperatures and calibration.
Fuses
The fuses are located at the back of the unit within the fuse holders. The fuses act as a circuit breaker
and will cut off power to the unit if there is an electrical surge or malfunction. The fuses must be in place
for the unit to operate. Please contact customer service for more information.
Over Temperature Limit Thermostat (OTL)
This controller is marked “Set Over Temperature” and is completely independent of the Temperature
Controller. The OTL guards against any failure of the Temperature Controller that would allow the
temperature to rise past set point. If the temperature rises to the OTL set point, the OTL takes control of
the heating element and allows continued use of the water bath until the problem can be resolved or
service can be arranged. The OTL is manually adjusted with a screwdriver or coin so accidental
adjustment cannot occur.
Heating Activated
This light is ON when the Temperature Controller has activated the heating element to reach and maintain
set point.
Over Temperature Activated Light
This light is ON when the Over Temperature Safety Thermostat has been activated. Under normal
operating conditions this light should never be on.
Microprocessor Control Water Baths 8
Section
6
OPERATION
Warning: These baths are not intended for use as acid baths. Use as an acid bath will cause severe
damage to bath components and void your warranty. Do not use deionized water, tap water,
or chemicals. USE DISTILLED WATER ONLY.
Attention : Ces bains d'eau ne sont pas conçus pour les acides. Utiliser un tel bain comme bain d'acide
l'endommagera gravement et annulera la garantie. Ne pas utiliser d'eau désionisée, d'eau
du robinet ni de produits chimiques. UTILISER EXCLUSIVEMENT DE L'EAU DISTILLÉE.
Turning On the Unit
To turn on the unit, perform the following steps:
1. Check power supply against unit serial plate; they must match.
2. Plug service cord into the electrical outlet. If supplied with a detachable cordset, plug the female end
into the unit inlet and the male plug into the power supply. Verify that units requiring a fuse have the
fuse installed in the power inlet.
3. Fill bath to your required depth with DISTILLED WATER. DO NOT USE TAP WATER, DEIONIZED
WATER, OR CHEMICALS. Normal depth is 5 ½ inches (14 cm), but depth must be at least 2 inches
(5 cm) over the bottom of the rack. Check water level frequently, add water to appropriate levels if
needed. At higher operating temperatures, or under circumstances where a cover cannot be used, it
will be necessary to check the water level more frequently.
4. Push the Main power switch to the ON position and turn the Over Temperature Safety Thermostat to
Setting Main Temperature Control
To enter set point mode on the control, push and release either the Up or Down arrow pad one time and
the digital display will start to blink from bright to dim. While blinking, the digital display shows the set
point that can be changed using the UP or DOWN arrow pads. If the arrow pads are not pressed for five
(5) seconds, the display will stop blinking and will revert to reading the actual temperature in the bath.
Allow at least two (2) hours for the temperature to stabilize.
Warning: If the tank boils dry while containing plastic ware, the plastic can melt. If you intend to use
Attention : Si la cuve vient à s'assécher tandis qu' elle contient des ustensiles en plastique, le plastique
Calibrating the Main Temperature Control
We recommend that you calibrate your unit once it has been installed in its working environment and the
its maximum position, clockwise.
test tube racks, remember that plastic coated wire racks may wear and expose metal that
can cause damage. Preferably, use all plastic racks.
risque de fondre. Si des râteliers à tubes à essais constitués d'une ossature métallique
gainée de plastique sont utilisés, prendre garde que le plastique peut fondre ou s'user et
découvrir des parties métalliques risquant d'endommager différentes pièces. Il est
préférable d'utiliser des râteliers à tubes entièrement en plastique.
Microprocessor Control Water Baths 9
6
chamber temperature has been stable at the set point for several hours.
1. Place a calibrated reference thermometer in the bath (a thermometer clip is provided with the
accessories package). (See Figure 2 for placement.) Allow the thermometer to reach temperature and
remain stable for one (1) hour.
2. Compare the reading on the reference thermometer with the temperature control display. If there is a
difference, put the display into calibrate mode by pressing both the Up and Down arrow pads at the
same time until the two (2) outside decimal points begin to blink.
3. When the decimal points are blinking, press the Up or Down arrow pad to adjust the display to match
the reference thermometer. If the arrow pads are not pressed within five (5) seconds the display will
revert to showing the temperature within the bath.
4. Allow the unit to stabilize again, and repeat calibration if necessary.
Setting the Over Temperature Limit Thermostat
To set the Over Temperature Thermostat, perform the following steps:
1. Verify that the Thermostat was set to its maximum position to allow the water bath to stabilize.
2. Turn the Thermostat counterclockwise until the Safety indicator light turns on.
3. Turn the Thermostat clockwise until the Safety indicator light turns off.
4. Turn the thermostat clockwise again, 1/16” past the point where the indicator light went out. This will
set the Thermostat at approximately 1C above the Main Temperature set point.
Figure 2. Thermometer Placement
9850563
Note: Water bath thermometer must be placed so that the bulb is always fully immersed. The thermometer
must not touch the sides or the bottom of the bath tank.
Remarque : L'élément chauffant du bain n'est pas en contact avec le fond de la cuve et est protégé dans
le cas où la cuve s'assèche. Cependant, il vaut mieux éviter que cela se produise car le
chauffage à sec impose de fortes contraintes aux parois.
10 Microprocessor Control Water Baths
11
Bath Cover Assembly
Handle Part#3800609
To assemble the bath cover, perform the following steps:
1. Insert 2 (Item 4) self-tapping screws through the respective cover holes and into the holes in the
handle (Item 2), leaving the first self-tapping screw loose to assure proper alignment. See Figure 3.
Firmly fasten both screws into place. Do not over-tighten.
Figure 3. Bath Cover Assembly
6
Microprocessor Control Water Baths
Section
7
MAINTENANCE
Warning: Prior to any maintenance or service on this unit, disconnect the power cord from the power
supply and the drain water from the tank. Before reattaching the unit to its power supply, be
sure all volatile and flammable cleaners are evaporated and dry.
Avertissement: Avant d'effectuer toute maintenance ou entretien de cet appareil, débrancher le cordon
secteur de la source d'alimentation. Avant de reconnecter l'appareil sur le secteur,
s'assurer que tous les produits de nettoyage volatiles et inflammables sont complètement
évaporés.
Cleaning
To clean the water bath, perform the following steps:
1. Clean the water bath with mild soap and water solution. DO NOT USE chlorine-based bleaches, as
they will damage the tank interior. DO NOT USE spray cleaners that may contain solvents, which
could leak through openings and cracks and harm electrical part coatings. Failure to do this may
permanently damage the unit.
2. Rinse the water bath with clean water and wipe dry with a soft cloth. Stainless steel does not rust, but
foreign materials in the tank may rust or leave rust spots. If corrosion is seen, scrub out the stains
with a mild abrasive, never steel wool.
Heating and Water Level
The heating element of this bath does not contact the tank bottom, thus will not burn out if the tank is allowed
to run dry. However, a tank going dry during operation can strain interior surfaces so this should not be
allowed to occur. During operation a minimum of 5cm (two inches) of distilled water should be in the tank.
Check water bath water level frequently, add water as needed. Please note that at higher operating
temperatures, or in applications where a cover is not used, more frequent water level checking is required.
Test-tube Racks
If the water bath tank boils dry while containing plastic-ware, the plastic will melt. If you intend to use testtube racks that are wire or plastic-coated wire that may wear and expose metal, damage may occur to the
tank. It is recommended that all-plastic racks be used, and that the tank never be allowed to boil dry.
Microprocessor Control Water Baths 12
Problem
Possible Cause
Solution
Temperature too high
Insufficient
quantity of water.
Fill bath a minimum of three-fourths (3/4) full with water.
Main controller set
too high
See Setting Main Temperature Control
Main controller
failed on
Call customer service.
Display reads "HI" or "400"+
Probe is unplugged
Call customer service.
Probe is broken or
wire to the sensor is
broken.
Call customer service.
Temperature spikes over set
point and then settles to set
point.
Calibration issue
Recalibrate.
Temperature is too low
Over Temperature
Limit is set too low.
See Setting Main Temperature Control.
Bath temperature
not recovered from
water being added.
Wait for display to stop changing.
Unit not recovered
from power failure
or being turned off.
Bath will need a minimum of 2 hours to warm up and stabilize.
Main controller
failure
Confirm with front panel lights that controller is calling for heat.
Display reads "LO" but heating
all the time
Control failure
Call customer service.
Unit will not heat over a
temperature that is below set
point
OTL has activated.
Confirm that set point is set high enough and that the Over
Temperature Safety is not activated.
Temperature
calibration is not
correct.
Check calibration. Using independent thermometer, follow
instructions in Calibration.
Section
8
TROUBLESHOOTING
Should the unit malfunction, use this section to determine the problem and resolution. Troubleshooting
topics include:
Temperature
Miscellaneous
Warning: Troubleshooting procedures involve working with high voltages that can cause injury or death.
Troubleshooting should be performed only by trained personnel.
Avertissement: Les procédures de diagnostic des problèmes impliquent de travailler sur des composants
sous tension et par conséquent un risque de blessure ou de mort par électrocution. Le
diagnostic des problèmes doit être confié exclusivement à des personnes qualifiées.
Temperature Troubleshooting
13 Microprocessor Control Water Baths
8
Problem
Possible Cause
Solution
Unit will not heat up at all
Controller Fault.
Do all controller functions work? Controller failure-call
Customer Service.
OTL has activated.
Set the Over Temperature Thermostat higher.
Indicated bath temperature
unstable
Insufficient
quantity of water.
Fill bath a minimum of three-fourths (3/4) full with water.
Fluctuating by ±
0.1?
May be normal, especially without the use of bath cover.
Ambient room
temperature is
radically changing
Temperature fluctuation due to door opening or room airflow
from heaters or air conditioning. Stabilize ambient conditions.
Bath not full
Assure that the bath is at least 1/3 full.
Electrical noise
Remove nearby sources of RFI including motors, arcing relays
or radio transmitters
Bad connection on
temperature sensor
or faulty sensor
Call customer service.
Will not maintain set point
Insufficient
quantity of water.
Fill bath a minimum of three-fourths (3/4) full with water.
Temperature set
too low.
Assure that set point is at least 5 degrees over ambient room
temperature.
Ambient
temperature too
high.
See if ambient is fluctuating.
Cannot adjust set points or
calibration
Controller hangs
up.
Turn entire unit off and on to reset. If repeatedly happens, call
Customer Service.
Calibrated at one temperature,
but not at another
Set point too far
from calibration
point.
This can be a normal condition when operating temperature
varies widely. For maximum accuracy, calibration should be
done as close to the set point temperature as possible.
Problem
Possible Cause
Solution
Water Leaking
Leak / Corrosion
Shut the unit off and call Customer Service. Service
Tank Discoloration
Wrong type of
water
Assure that clean, distilled water is used. Deionized water, tap
water and chemicals should never be used in the tank.
USE DISTILLED WATER ONLY.
Sample Spills
Assure that no test samples have leaked into bath water.
Metal Racks
No metallic products should be in the tank with the exception of
the oscillation rack.
Unit will not turn on
No power.
Check wall power source.
Fuse blown.
Check fuse/circuit breaker on unit or in wall.
Miscellaneous Troubleshooting
Service
If this product should require service, contact your customer service representative.
14 Microprocessor Control Water Baths
Description
100-120V
220-240V
Element
9570743
9570744
Fuse, 6.3 AMP
3300515
3300515
Gable Covers
9750511
9750511
Microprocessor Main Temp Control
1750965
1750966
Over Temperature Safety Control
1750747
1750747
Pilot Lamp, Green
4650554
4650554
Pilot Lamp, Red
4650553
4650553
Power Cord
1800529
1800541
Power Switch
7850570
7850570
Rubber Feet w/Screws
2700513
2700513
Tank Gasket
3450538
3450538
Tanks
7930510
7930510
Section
9
PARTS LIST
Table 3. Parts
15 Microprocessor Control Water Baths
Section
10
Model
Shipping
Net
SWB30 SWB30-2
(WPC95 WPC95-2)
34.3 lb
15.56 kg
28.1 lb
12.75 kg
Model
Exterior WxDxH
Interior WxDxH
SWB30 SWB30-2
(WPC95 WPC95-2)
16 x 19 x 16 in
40.64 x 48.26 x 40.64 cm
12 x 14 x 11 in
30.48 x 35.56 x 27.94 cm
Model
Liters
SWB30 SWB30-2
(WPC95 WPC95-2)
30
Model
Range
Uniformity
Sensitivity
SWB30 SWB30-2
(WPC95 WPC95-2)
Amb. +5C to 80C
+.2C @ 37C
+ .1C
Model
Voltage
Amperage
Frequency
SWB30
(WPC95)
100-120V
7.0
50/60Hz
SWB30-2
(WPC95-2)
220-240
3.5A
50/60Hz
Section
10
UNIT SPECIFICATIONS
Table 4. Weight
Table 5. Dimensions
Table 6. Capacity
Table 8. Voltage Requirements
Table 7. Temperature
16 Microprocessor Control Water Baths
SCHEMATICS
HOT
NEUT RAL
GROUND
LOAD
SENSOR
1
2
4
TEMPERATURE
CONTROL
1750965
OTP LIGHT
4650553
HEATING LIGHT
4650554
OTP
THERMOSTAT
1750747
750W 16.3Ώ
GREEN LIGHTED POWER SWITCH 7850570
HOT TERMINAL BLOCK
NEUTRAL TERMINAL BLOCK
POWER CORD
1800529
FUSE
Figure 4. Wire Diagram SWB30 (WPC95) (9851341)
Microprocessor Control Water Baths 17
HOT
NEUTRAL
GROUND
LOAD
SENSOR
1
2
4
TEMPERATURE
CONTROL
1750966
OTP LIGHT
4650553
HEATING LIGHT
4650554
OTP
THERMOSTAT
1750747
750W 60Ώ
GREEN LIGHTED POWER SWITCH 7850570
HOT TERMINAL BLOCK
NEUTRAL TERMINAL BLOCK
POWER CORD
1800541
2800502
EMI FILTER
FUSE
FUSE
Figure 6. Wire Diagram SWB30-2 (WPC95-2) (9851342)
18 Microprocessor Control Water Baths
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