Precision 280 Series User manual

Precision
170 Marcel Drive
Winchester, VA
USA
Phone:[phone]
TollFree:800-621-8820
FAX: [phone]
ManualP/N36100112(340016400)
RevDDated08NOV01
280, 281, 282, 283, 284, 285, 286 & 288
Installation and Operation Manual
Microprocessor-Controlled
General Purpose Water Baths
280Series
Models
Press or until desired temperature is displayed.
Press ENTER - New Set Point is a ccepted.
Displaywill then return to actual temperature.
Should Calibration Be Required:
Place certified / traceable thermometer into holder.
Press or to match readout to thermometer.
Press ENTER - calibration is complete.
Off
On
Heater O n
Calibrate
ENTER
q
To Set Temperature:
q
Allow to stabilize.
Press Calibrate button.
p
p

NOTICE
THE MATERIAL IN THIS MANUAL IS FOR INFORMATION PURPOSES ONLY. THE
CONTENTS AND THE PRODUCT IT DESCRIBES ARE SUBJECT TO CHANGE WITHOUT
NOTICE. PRECISION MAKES NO REPRESENTATIONS OR WARRANTIES WITH
RESPECT TO THIS MANUAL. IN NO EVENT SHALL PRECISION BE LIABLE FOR ANY
DAMAGES, DIRECT OR INCIDENTAL, ARISING OUT OF OR RELATED TO THE USE
OF THIS MANUAL.
For repair information or replacement parts assistance from the manufacturer,
call Customer Service using our toll free telephone number.
800-621-8820
(FAX)540-869-0130

Initialrelease
12/98A
INDEX DATE AMENDED PAGES NOTES
REVISION STATUS
Pictorial update of wiring per
ECO JGC000223A
02/00B17
updatedelectricalsecificationsC 07/01 2,8,9,12,17
D NOV01 Add caution "acidic & caustic
substance....."
5

Contents
1. Introduction..................................................................................................................... 1
2. Unpacking and Damage ................................................................................................ 1
3. General Information ........................................................................................................ 2
4. Performance Data ........................................................................................................... 3
5. Installation ....................................................................................................................... 3
6. Explanation of Controls ................................................................................................. 4
7. Operation......................................................................................................................... 5
8. Maintenance .................................................................................................................... 6
9. Troubleshooting ............................................................................................................. 7
10. Parts Replacement ..................................................................................................... 10
11. Replacement Parts List .............................................................................................. 12
12. Assembly and Schematic Drawings ......................................................................... 14
13. Warranty ...................................................................................................................... 19

1
2.0 UNPACKING AND DAMAGE
2.01 This product was carefully packed and
thoroughly inspected before leaving our
factory. Save all packing material if apparatus
is received damaged.
2.02 Responsibility for safe delivery was assumed
by the carrier upon acceptance of the
shipment; therefore,claimsforlossor damage
sustained in transit must be made upon the
carrier by the recipient as follows:
Visible Loss or Damage: Note any external
evidence of loss or damage on the freight bill
or express receipt, and have it signed by the
carrier'sagent. Failure toadequately describe
such external evidence of loss or damage
may result in the carrier's refusing to honor
your claim. The form required to file such
claim will be supplied by the carrier.
Concealed Loss or Damage: Concealed
loss or damage is any loss or damage which
does not become apparent until the
merchandise has been unpacked and
inspected.Should eitheroccur, makeawritten
requestfor inspection bycarrier'sagent within
15 days of the delivery date; then file a claim
with the carrier.
2.03 If you follow the above instructions carefully,
Precision will guarantee our full support of
your claim to be compensated for loss or
damage in transit.
DO NOT  for any reason  return this
unit to PRECISION without first obtaining
returnauthorization.Inany correspondence
withPRECISION pleasesupplythe nameplate
data, including catalog number and serial
number.
1. 0 INTRODUCTION
1.01 Your satisfaction and safety are important to
PRECISION and a complete understanding
of this unit is necessary to attain these
objectives.
1.02 As the ultimate user of this apparatus, you
havethe responsibilitytounderstand itsproper
function and operational characteristics. This
instruction manual should be thoroughly read
and all operators given adequate training
before attempting to place this unit in service.
Awareness of the stated cautions and
warnings,and compliancewith recommended
operating parameters  together with
maintenancerequirementsare importantfor
safe and satisfactory operation. The unit
should be used for its intended application;
alterations or modifications will void the
warranty.
WARNING
AS A ROUTINE LABORATORY PRECAUTION,
ALWAYS WEAR SAFETY GLASSES WHEN
WORKING WITH THIS APPARATUS.
1.03 This product is not intended, nor can it be
used, as a sterile or patient connected device.
In addition, this apparatus is not designed for
use in Class I, II, or III locations as defined by
the National Electrical Code.

2
3. 0GENERAL INFORMATION
3.01 Precision Baths are widely used in research
andqualitycontrol.Theirsuperbtemperature
uniformityandstabilitymakesthemespecially
desirable for legal or reference tests.
3.02 Themicroprocessorcontrolpanelhousesall
functions necessary to operate the bath.
The push-button keys and single display
window allows the operator to adjust bath
temperatureandtemperaturecalibrationvia
a single set of controls.
3.03 The Proportional Integral Derivative (PID)
temperature control allows precise
temperature control. Use of the gable cover
provided is required to maintain optimal
temperature sensitivity.
3.04 A high limit temperature cutout is provided in
the event of an empty water bath. If the
sensor reads a temperature 5°C higher than
thesettemperature,ahightemperaturecutout
will occur indicated by a display reading of
"EEE," and the heater will be inhibited from
operating. To reset the bath, the power must
be turned off and then back on again. The
high limit temperature cutout is internally set
for 5°C above any set temperature and can
not be set by the user.
3.05 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 glycol with corrosion
inhibitor's added. The body is made from
galvanized steel and is painted for added
protection. A gable cover is also provided
with the bath.
3.06 The230-voltunitsareidenticalinappearance
to the 120-volt units.
* Each Chamber
Table 3.1 Listing of Models Included in this Manual
Model
Number Catalog Number
Electrical Characteristics Capacity
Volts Watts Amps Liters Gallons
280 51221044
51221045 120 230 225 1.9 11.5 0.4
281 51221046
51221047 120 230 225 1.9 12.5 0.7
282 51221048
51221049 120 230 300 2.5 1.3 5.5 1.5
283 51221050
51221051 120 230 400 3.3 1.7 12.0 3.2
284 51221052
51221053 120 230 600 5 2.6 19.5 5.2
285 51221054
51221055 120 230 600 5 2.6 18.0 4.9
286 51221056
51221057 120 230 1200 10 5.2 43.0 11.4
288 51221058
51221059 120 230 800 6.7 3.5 12.0* 3.2*

3
5.02 Electrical Connections -
WARNING
FOR PERSONAL SAFETY, THIS APPARATUS MUST
BE PROPERLY GROUNDED.
1. The power cord provided on this unit is
equipped 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.
2. Where a standard two-prong wall receptacle
isencountered, it isthe personalresponsibility
and obligation of the user to have it replaced
with a properly grounded three-prong wall
receptacle. Do not, under any
circumstances, cut or remove the third
(ground) prong from the power cord. Do
not use a two-prong adapter plug.
5.03 Determine the total amount of current being
used by other apparatus connected to the
circuit that will be used for this apparatus. It
is critical that the added current demand (see
nameplate) of this and other equipment used
on the same circuit does not 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.
DIFFUSER PAN
LEG EXTENSION KIT
P/N 34002259
4.0 PERFORMANCE DATA
4.01 The following table identifies the
specifications for the Water Baths.
5.0 INSTALLATION
WARNING
INSTALLATION SHOULD BE COMPLETED BY
QUALIFIED PERSONNEL ONLY.
5.01 1. The most uniform operating conditions and
results will be obtained by placing the bath on
a level surface in an area remote from drafts,
ventilatingoutlets, radiators, and otherrapidly
changing ambient conditions.
2. Placethe stainlesssteelmetalshelf (corners
facing downward) inside the bath chamber.
The shelf (Diffuser Pan) provides a sample
base and protects samples from touching the
hot metal bath bottom. If it is necessary to
increase the height of the diffuser pan, a Leg
Extension Kit is included for this purpose,
exceptfor theModel 281water bath.Following
thefigure shown below,attach the4 extension
legs to each of the four corners of the diffuser
pan.
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6.0 EXPLANATION OF
CONTROLS
6.01 Power Switch - The power switch is located
near the lower portion of the control panel
and provides power to the entire unit.
6.02 Control Panel - The Control Panel provides
a digital readout of temperature readings,
heater on indicator, and keys for user to
make their desired selections.
1. LED Display - Three digits are used to
display the actual, set, and calibrated values
for temperature.
2. Heater On Lamp - The "HEATER ON" lamp
is lit when power is applied to the heater.
3. Calibrate Key - This key puts the unit in
calibrate mode to match a traceable
thermometer to the actual temperature
display.
4. Temperature Selection Keys - These keys
are used to increase or decrease the setpoint
and/or calibrate temperature selections.
5. Enter Key - The enter key is used to store a
new setpoint or calibration value.
1
2
3
4
5

5
7.0 OPERATION
CAUTION:
EXERCISE CARE WHEN USING ACIDIC OR
CAUSTIC SOLUTIONS AS THEY WILL ATTACK
THEGALVANIZEDSTEELBATHBODYIFSPILLED
INTO THE BATH. IF SPILLS DO OCCUR, THE
BATH LIQUID SHOULD BE IMMEDIATELY
DRAINED AND THE UNIT THOROUGHLY
FLUSHED.SPILLSANDCONDENSATIONSHOULD
BE CLEANED/REMOVED FROM ALL METAL
SURFACES AFTER EACH USE.
7.01 When filling the bath with water, allowance
must be made for the displacement of water
upon immersion of samples. The maximum
liquid level is 1 inch below the top of the pan.
7.02 To conserve energy, reduce evaporation,
increase temperature control accuracy, and
reach/maintain 100° C, use the gable cover
provided. Do not use aluminum foil as a
cover, as it may cause corrosion due to an
electrochemical reaction.
1. Add distilled water to bath. The water level
shouldbenocloserthan1"fromthetopofthe
bath when the bath is fully loaded. NOTE:
Use distilled water only. If deionized is the
only water available, a mixture with 50/50
ratio of deionized and tap water should be
used. Deionized (18 MEG) will damage
metals.
2. Powerup:Depress thepowerswitchlocated
at the lower end of the control panel.
Immediately after turning on power, all of the
segments of the display will be on along with
the HEATER ON indicator. After 3 seconds,
the current set temperature will be displayed
and this will last for 5 seconds. Then the
display will change to the actual bath
temperature.
3. To display the temperature setpoint:
Todisplaythesettemperature,quicklypress
the /\ (up) or \/ (down) key. The current set
temperaturewillbedisplayed.After5seconds,
the display will return to the actual bath
temperature.
4. To change the temperature setpoint:
Tochangethesettemperature,continuously
press the /\ or \/ key until the desired set
temperatureisdisplayed. Whencontinuously
pressing either the /\ or \/ keys, the display
will change slowly at first but after 1 degree
has passed the display will begin to change
rapidly. Withalittlepractice,onewillbecome
accustomed to this. After the desired set
temperature is achieved, then press the
ENTER key. The display with the new set
temperature will flash three times and then it
will return to the bath temperature.
If the ENTER key is NOT pressed, the
expected new set temperature will not be
acceptedandthewaterbathwillcontrolatthe
previous set temperature.
5. To calibrate the water bath:
The water baths are calibrated at the factory
for use over a wide range of temperatures.
Duetonon-linearitiesinthecontrolsystem,it
maybenecessarytomakethedisplaymatch
a calibrated thermometer's reading, even
though the difference might be only a few
tenth's of a degree.
Thecalibratefunctionshouldbe usedonlyto
match a STABLE bath's actual temperature
to the calibrated thermometer.
Toperformcalibration,presstheCALIBRATE
key. The display will change to CAL, then
flash back to bath temperature. This will
occurfourtimes,ifnootherkeys,arepressed,
then it will resume displaying the bath
temperature.
After inserting a calibrated thermometer into
theholderandlettingitstabilizeforaminimum
of 15 minutes, note its reading.
Press the CALIBRATE key once again and
while the display is flashing, press either the
/\ or \/ key to make the display match the
notedthermometerreading. Afterthesatisfied
display is achieved, press the ENTER key.
The display will flash three times with the
adjustedreadingandthenstopflashing. The
bath is now calibrated more accurately for
that control set point.

6
8.0 MAINTENANCE
8.01 Cleaningand careof stainlesssteel: Stainless
steel will resist corrosion; however, it is not
impervious to it. For maximum life, stainless
steel must receive a certain amount of care.
CAUTION
AVOID SPILLING HARSH CHEMICALS ONTO THE
BATH, AS CORROSION OF THE STAINLESS
STEEL MAY RESULT.
1. Thereare manychemicalcleaners, butusually
just changing the water and periodic cleaning
with mild soapy water or a non-scratching
scouring power will suffice.
Should algae or other undesirable
microorganisms form on the top of the bath
media, add a little formaldehyde or zephiran
chloride to alleviate this problem.
CAUTION
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
OXYGEN. THE RESULTING ELECTROLYTIC ACTION
WILL PIT OR ERODE THE STAINLESS STEEL.
2. Should it be necessary to use a media other
than water such as those listed below, limit
the time to a maximum of four hours. Clean
surfaces immediately after use.
Aluminum Chloride Barium Chloride
Bichloride of Mercury Calcium Chloride
Carbolic Acid Chlorinated Lime
Citric Acid (boiling) Dakin's Solution
Ferrous Chloride Mercury Salts
LysolMercuric Chloride Phenol
Potassium Permanganate Stanous Chloride
Sodium Hypochlorite Tartaric Acid
Potassium Thiocyanate
3. Should the stainless steel ever become
discolored by iron rust, use the following
procedure to remove all traces of the rust and
restore the stainless steel.
WARNING
ALWAYS OBSERVE THE FOLLOWING SAFETY
PRECAUTIONS! USE HEAVY GLOVES OR OTHER
ADEQUATE HAND PROTECTION. WEAR GOGGLES
OR OTHER ADEQUATE EYE PROTECTION. WORK
ONLY IN AREAS WITH ADEQUATE VENTILATION.
Prepare a solution of 20% nitric and 1.5%
hydrochloric acid (if preferred, a 2% to 5%
solution of warm oxalic acid may be used).
Swab solution over surface, allowing it to
remain until all rust is loosened. This will
usually take 1 to 2 minutes.
As soon as rust is loosened, immediately
flush with clean water until all acid is removed.
Dry thoroughly.
4. During operation, quite a bit of condensation
forms on the inside of the gable cover. When
removing the gable cover, have one of its
corners centered above the water bath, so
that the water runoff goes into the bath.
Shaking the cover aids the water runoff. Be
sure to wipe up any water spillage on or
around the bath.
CAUTION
NEVER USE THE FOLLOWING CHEMICALS:
AQUA REGIA FERRIC CHLORIDE IODINE
SODIUM AZIDE SULFURIC ACID

7
Troubleshooting Procedures
Problem Procedure
9.02 The following is a list of the tools and
instruments required to perform the
procedures outlined in the Troubleshooting
Procedures table.
Suggested Tools:
 Phillips Screwdriver
7/16" Socket or adjustable wrench
 Ohmmeter
DC Voltmeter
 AC Voltmeter
5VDC Power Supply
Nut Driver 11/32"
9.0 TROUBLE SHOOTING
WARNING
SERVICE SHOULD BE PERFORMED BY A
QUALIFIED TECHNICIAN. BEFORE REPLACING ANY
ELECTRICAL OR MECHANICAL COMPONENTS,
UNPLUG THE LINE CORD. IF ELECTRICAL POWER
IS REQUIRED FOR SERVICE, USE EXTREME CARE.
9.01 Refer to Troubleshooting Procedures Table
(9.03 through 9.06) for troubleshooting
information on the baths. This table provides
the basic information required to repair the
bath.
9.03 No Heat 1. Verify that setpoint temperature is greater than the actual
water temperature.
2. Check temperature probe.
A. Disconnect unit from electrical supply.
B. Disconnecttemperature probe connector J5from Control
Board.
C. Place 5 volt DC between Pins 1 & 3 on temperature probe
connector.
D. Place a voltmeter between Pins 2 & 3 on temperature
probe connector. Place the temperature probe in a bath
of known temperature. Verify that the output voltage of
the temperature probe approximately corresponds to the
values in the table below.
Degrees Centigrade vs. Output Voltage of Temperature
Probe
Temp °C Vout Temp °C Vout
0 320mV 60 1.400V
10 500mV 70 1.580V
20 680mV 80 1.760V
30 860mV 90 1.940V
40 1.040V 99.9 2.218V
50 1.220V

8
9.03 No Heat (cont.)
Troubleshooting Procedures
Problem Procedure
E. Ifa5VDCpowersupply isnotavailable,leaveJ5connected
to the control board, turn power on, and repeat step D by
placing the voltmeter probes on J5, Pins 2 & 3.
4. Check Heater.
A. Disconnect unit from electrical supply.
B. Obtain access to the heater by removing the bottom cover
andthenremoving the insulation. Theheatershavered and
white wires connected to them from the control board.
Disconnect the red wire from the heater to isolate it from the
board. Connectanohmmeteracrosstheheater. Thenusing
the chart below, determine which reading you should obtain
depending on the model. On most of the 230-volt models,
there are two separate heaters which are connected in
series. Thevaluesbelowareapproximate. Ifthe resistance
varies more than ±20% from these listed values, then the
heater should be replaced.
280-120V 60 Ohms
280-230V 260 Ohms
281-120V 60 Ohms
281-230V 260 Ohms
282-120V 48 Ohms
282-230V 196 Ohms Total (98 Ohms each)
283-120V 35 Ohms
283-230V 140 Ohms Total (70 Ohms each)
284-120V 25 Ohms
284-230V 100 Ohms Total (50 Ohms each)
285-120V 25 Ohms
285-230V 100 Ohms Total (50 Ohms each)
286-120V 25 Ohms
286-230V 100 Ohms Total (50 Ohms each)
288-120V 35 Ohms
288-230V 140 Ohms Total (70 Ohms each)
Re-connect the red wire back to the heater.

9
9.06 No Display
9.05 Too much heat
Troubleshooting Procedures
Problem Procedure
9.04 Unstable temperature control
5. Check TRIAC (High voltage output of control board)
A. Make sure power is disconnected from the unit.
B. Connect an AC voltmeter across the heater capable of
reading120or230volts,dependingonyourparticularunit.
C. Turnpoweronandselectasetpointhigherthantheactual
temperaturetogettheHEATERONindicatortoilluminate.
With the HEATER ON indicator lit, there should be either
120or230voltsacrosstheheater. Ifnot,thecontrolboard
should be replaced.
1. Use gable cover provided to improve temperature control.
2. Verify that temperature setpoint is set at desired value.
3. If control is stable, but not at desired temperature, check the set
temperature or perform calibration. (See Paragraph 7.0, Step 5.)
4. Check Temperature Probe (see Paragraph 9.03, Step 2).
1. Check Temperature Probe (see Paragraph 9.03, Step 2).
2. Check TRIAC (see Paragraph 9.03, Step 5).
1. Verify that the water bath is plugged in.
2. Verify that Power switch is in the on position.
3. Disconnectunitfromtheelectricalsupply,gainaccesstothe
controlboardandcheck Fuse 1 locatednearthetransformer
on the control board.

10
1. Remove the necessary screws to remove the bottom pan
from underneath the water bath. Then remove the insulation
necessary to view the temperature sensor and its orientation
when connected to the control board.
2. Disconnect the sensor from the control board at J5.
3. The temperature sensor is mounted to the pan with a steel clamp.
Loosen the nut that holds the clamp which in turn holds the sensor
inplace. Notethatthesensorhasitsflatsideagainstthepan. When
installing a new sensor, it is important to do the same.
4. Reverse the procedure to install the new sensor.
5. Recalibrate the water bath with the new sensor. See Section
7.0 Operation, Step 5.
1. Remove the necessary screws to remove the bottom pan
from underneath the water bath. Then remove the insulation
necessary to gain access to the heater(s).
2. Disconnect the wires that are attached to the heaters.
3. Using a 11/32" nut driver, remove the nuts that hold the
heater brackets in place.
4. Replacetheheater(s), heaterbrackets, andre-attach thewires.
1. Remove the necessary screws to remove the bottom pan
from underneath the water bath. Then remove the insulation
necessary to gain access to the control board, and hex nuts
which hold the bath pan to the body.
Parts Replacement
10.04 Replace Heater
10.05 *Replace Control Board
10.03 Replace Temperature Sensor
10.0 PARTS REPLACEMENT
WARNING
BEFORE REPLACING ANY PART, BE SURE BATH IS
DISCONNECTED FROM POWER SOURCE.
SERVICE SHOULD BE PERFORMED BY A
QUALIFIED TECHNICIAN.
10.01 Before removing any parts for replacement,
verify part in question by following the
instructions listed in the troubleshooting
guide.
10.02 Refer to Parts Replacement Table below for
appropriatereplacement procedures. Failure
to follow parts replacement procedures may
cause damage to the bath.

11
Parts Replacement (cont.)
2. Disconnect the wires that are attached to the heater.
Then disconnect the temperature sensor from J5 on the
control board.
3. Remove the bath pan from the body by removing each
11/32" nut from each corner of the pan. NOTE: MODEL
286 has 6 hex nuts which hold the pan in place.
4. Disconnect J1 and J2 from the control board.
5. Remove the 4 nuts that support the board. Remove the
control board and replace it, then reverse this procedure.
10.05 Replace Control Board (cont.)
10.06 Replace Diffuser Pan Leg
Extension 1. Attach the four extension legs to each of the four corners
of the diffuser pan using the nut, splitwasher and screw
provided.Refer to figure shownonpage 3 of thismanual.
*CAUTION
When replacing the Control Board #34393401, note the following:
1. For 115 Volt models, JP3 and JP4 must be installed.
2. For 230 Volt models, JP3 and JP4 must be removed.

12
11.0 Replacement Parts List
120-Volt Models
280 281 282 283 284 285 286 288
Pan 34541683 34541928 34541916 34541917 34541929 34541918 34541930 34541917
Diffuser Plate Assy. 34537946 34537945 34537946 34537949 34537947 34537954 34537953 34537949
PCB Assy. 34393401
Heater 34247411 34247411 34247412 34247413 34247414 34247414 34247414 34247413
Heater Harness 34394301
Power Harness 34394401
Temp. Probe
Assembly 34542496
Heater Insulator 34637401 34637401 34637402 34637403 34637404 34637404 34637404 34637403
On/Off Switch 34240618
Leg Extension Kit 34002259
Line Cord 36353081
Gable Cover 51200823 34002499 51200823 51200824 51200827 51200838 51200839 51200824

13
11.0 Replacement Parts List (cont.)
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14
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V  F R P S O H W H 
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p
q
p
q
12.0 ASSEMBLY & SCHEMATIC DRAWINGS
DETAIL "A"
BOTTOM
COVER
TYPICAL FRONT VIEW
POWER SWITCH
PAN
BATH BODY

15
TYPICAL REAR VIEW
GLASSWOOL
INSULATION
THERMOMETER
HOLDER
POWER LINE
CORD

16
ON/OFF
SWITCH
PCB ASSEMBLY
TYPICAL BOTTOM VIEW
POWER
HARNESS
HEATER
HARNESS
HEATER
HEATER
INSULATOR
POWER LINE
CORD
THE FLAT SIDE OF THE
SENSOR MUST COME IN
CONTACT WITH THE PAN
TEMPERATURE
PROBE ASSEMBLY