FISHER

Catalog

lsotemp'Ovens

Numbers: 13-244-1 and 13-244-3

ffiFIsHER

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FISHER lsotemp'Ovens

Catalog Numbers: 13-244-1 and 13-244-3
CATALOG NO.

OPERATING METHOD

CAPACITY

TEMPERATURE RANGE

TEMPERA T URE UNIFORMITY

(AVERAGE DEVIATION)

'KMAXIMUM VARIATION

(coNSTANCY)

HEATING RATE

POWER REQUIREMENT

VOLTAGtr REQUIREMENT

FREQUENCY

CURRENT

DIMENSIONS, Outside

(WxDxH, Inches)

DIMENSIONS, Inside

(WxDxH, Inches)

NET WEIGHT

"lMaxirnum variation at

operation.

SPECIFICATIONS

L3-244-L

(JUNTOR MODtrL ZOt )

GRAVITY

t3_244_3

(sENroR MODEL 203)

CONVtrCTION

1 cuft

40" to 200. c

+0.5"C at 100oC

iL.4"C at ZOO"C

t0.8"C at 100"C

+1.8"C at Z0O'C

54 Min. to I00'C

83 Min. to 200"C

550 Watts

l15 or 230 Volts

50l 60 Cycle

4. 8 Arnps at I I5V

2.4 Arnps at Z3OY

16 I/Bx16 Ll2xZZ7/8

x l2 I 14 x'lI t/+

Pounds

3cuft

+1.0"C at 100"C

+1.9"C at 200'C

+1.0"C at 100'C

*1. l"C at 200"C

120 Min. to 100"C

165 Min. to ZOO"C

1000 Watts

a-c

8" 7 Arnps at ll5V

4. 3 Arnps at Z3OY

ZZ L/4 x 19 x Zg 314

18xl5x17L/4

105 Pounds

I2

66

the geornetric center of the oven during continuous ZZ-howr
CONTENTS

GENERAL DESCRIPTION

UNPACKING

ASSEMBLY

TEMPERAT URE ADJ US TMtrN T

PRECAUTIONS

MAINTENANCE

Adjustrnents

l. Magnetic Door Latch

Z. Door Hinges

R eplac ern ents

1. Scale Larnp

2. Therrnostat

3" Elernent Replacernent

4" Door Seal

REPLACEMENT PARTS

Parre

I

1

2

z

4

4

4

4

4

5

5

5

5

5

7

3

6

6

I

9

ILLUSTRATIONS

Figure

I Gravity-ConvectionlsoternpOven

2 Installation of Door Seal

3 View of Internal Cornponents

4 Junior Oven Wiring Schernatics

5 Senior Oven Wiring Schernatics

r-
J

GENERAL DESCRIPTION

Available in three rpodels (Junior, Senior, and Deluxe), the

Fisher Isoternp Gravity-Convection Ovens have been designed to

provide high perforlTrance ternperature control over the range

of 4C to 200'C. Because of this close ternperature control, the

ovens are suitable for a wide variety of general laboratory applications. Only the Junior and Senior rnodels are discussed in

this instruction rnanual.

In these rnodels, the air chamber is heated by electrical heate1.s,

and the temperature is controlled by dual therrnostats. The prlrnary thermostat provides all norrnal operation control; the second

thermostat is preset to 5"C above the prirnary therrnostat, and

takes over only if the prirnary therrnostat should fai1. This provides protection against fire and insures against loss of test inforrnation.

A band-type Ternperature Scale, operated by a single Ternperature Control Dial, is calibrated in both Centigrade and Fahrenheit" The scale reads in increrrrents of 1C degrees, and is accurate to *2" C. Final ternperature adjustrnent is rnade by placing

the supplied rnercury therrnorneter into an opening in the top of

the oven and rnaking srnall adjustrnents with the Ternperature

Control Dial unti] the therrnometer indicates the desired ternperature. This opening also serves as a vent and is covered by an

adjustable cap that controls the air flow. In operation, fresh air

enters through a port in the bottorn of the oven and escapes through

the vent in the top, carrying with it the vapors frorn drying or

evaporating sarnples.

UNPACKING

The Isoternp Gravity-Convection Oven, Junior or Senior Model,

and its accessory equiprnent are packed in a single carton. After

having carefully opened the top of the carton, cornplete and return the warranty card. Then, perforrn the following:

1. Stand the carton on one end so that the oven is standing

in a normal position on its base. Then, rernove the top

pad from the carton.

Z. Carefully slide the oven out of the carton. This operation

should be qulte easy because of the waxed end panels on

which the oven rests,

3. Open the oven door and rernove the therrnorneter and tray

assernbly f rorn inside the oven charnber.

4" Check all cornponents against the packing list that fo1lows.

If any are darnaged, notify the carrier and file clairn; if

any are rnissing, notify your nearest Fisher Branch.

I

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:

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Quantity

I

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l

I Set

,i.Basic No"

fo1low s:

Itern

Isoternp Oven

Therrnorneter, 35 to 200'C

Tray Assernbly:

Junior Model Only

Senior Model Only

Warranty Card

Instruction Manual

- The nurnbers for the various

Catalog No.

,:.I3 -244

r3 -246

I3-244-1-ozo7

t3 -244- 3_0206

""_':_t"

rnodels are as

'k'k The l-cu ft rnodel

3-cu ft rnodel has

ASSEMBLY

No. 13-244-IWZ

No. L3-244-7VZ

No" \3-244-3WZ

No. 13-244-3vZ

contains two rernovable shelves, while the

three rernovable shelves"

e I cu ft, Z3O-voIt

o I cu ft, ll5-volt

r 3 cu ft, 230-vo1t

o 3 cu ft, 115-volt

Place the oven on the laboratory bench or table where it wiil be

used, and level the oven by rneans of the adjustable feet. Allow

about LlZ-tnc}' clearance between the oven base and the bench top.

No clearance is needed for the sides or back.

At this point, rnake certain that the power switch of the oven is

off. Then, plug the line cord into a proper receptacle; ie. , rnake

certain that the circuit is capable of supplying the power requirernents of the oven. rf no 3-prong grounded outlet is available, use

an adapter and ground the pigtail.

Finally, set the shelves in position and insert the therrnorneter

into the opening on top of the oven. when inserting the therrnorneter, be sure not to obstruct the air vents in the adjustable

cap around the opening.

TEMPERATURE ADJUSTMENT

To adjust the ternperature of the oven, perforrn the foltowing (see

Figure 1):

l. Flip the Power Switch (B) to ON.

2. Slowly rotate the Ternperature Control Dial (D) clockwise

until the Pilot Larnp (A) is energized. The larnp should light

initially at about roorrl ternperature. When the larnp does

Iight, allow the oven to operate for several "on-off" cycles

to stabilize the control systern" If the pilot Larnp should

fail to light after L-tlZ ful1 turns of the Dial, check for possible larnp or power failure"

t-
Figure I * GRAVITY-CONVtrCTION ISOTEMP OVEN

A - Pilot Larnp

B - Power Switch

C - Ternperature ScaIe

D - Temperature Control Dial

tr - Safety Sentinel LarnP

F - Therrnometer

G - Vent, with Adjustable CaP

Ht, HZ - Screws for Door Hinge
3. Set the therrnostat by turning the Dial in the appropriate

direction until the Ternperature Scale indicates the desired ternperature" Each full turn of the Dial changes the

ternperature about 66" C" Final ternperature adjustment

is rnade by turning the Dial until the therrnorneter indicates

the desired ternperature.

4. The thermostat rnay be adjusted by any incrernent to any

higher ternperature (not exceeding ZOO" C) during operation

of the oven, with no chance of darnage to either the oven or

therrnostat"

5. The Pilot Larnp will be on when the oven is heating, and off

when the oven is at the ternperature set on the therrnostat.

6. If the prirnary therrnostat should fail and the second therrnostat takes over, the Safety Sentinel Lamp (E) will be energized.

The oven ternperature will then be approxirnately 5" C above

the Ternperature Scale setting"

7" For more precise ternperature control during continuous

operations at ternperatures up to 80'C, reduce the input

voltage to one-half the voltage rating of the oven. Either a

step-down or a variabLe transformer rnay be used.

PRECAUTIONS

When using the oven, the following precautions rnust be observed

al all tirnes:

o Do not operate the oven at ternperatures above ZOO"C.

o Do not atternpt to turn the ternperature scale beyond

the rninirnurn and rnaxirnurn stops.

o When placing objects on the top shelf of the oven, be

careful not to darnage the rnercury therrnorneter.

MAINTENANCE

Adjustrnents

l. Magner4s,rqeer Latch: To adjust the magnetic door latch,

loosen the screw on the side of the oven that locks the

rnagnetic striker plate in p1ace. Then, hold the oven door

fl-rrnly against the striker plate and tighten the screw.

2. Door Hinges (see Figure l): To adjust the door hinges on

the oven, loosen the screws (Ht & H2) that respectively

hold the top and bottorn hinges in place. Once these screws

have been loosened, the door can be rnoved in the slots as

necessary for rnaking adjustrnents in gasket pressure or

fit. A{ter the necessary adjustrnents have been rnade, retighten the screws.

4

r---*- _i
If it is necessary to rernove the door for any reason, rernove the screws (Hr) that hold the top hinge in place and

then rernove the hinge. Now, lift the door off the pin on

the bottorn hinge"

Replacernents

1" Scale Larnp: To replace a burned-out scale larnp, first disconrrect the power line. Next, rernove the perforated bottorn

panel frorn beneath the oven" The larnp can now be rernoved

frorn its socket. The 115 volt rnodels have bayonet-type

bases, and the 230 volt rnodels, screw-type bases.

Therrnostat: During norrnal operation, the Safety Sentinel

Ftl"tl-..nplE in Figure 1) will not be on. If this larnp should

come on, it indicates failure of the prirnary therrnostat and

a shift in ternperature control to the second therrnostat" When

this happens, contact the Technical Service Department of your

nearest Fisher Branch for servicing. The oven rnay be used

ternporarily on the second therrnostat, but the scale is no

longer accurate and the safety feature is no longer operative.

Elernent Replacernent: Replacing the heating elernents requires cornplete disassernbly of the oven panels and insulation, and should be done only by qualified personnel" If it

should becorne necessary to replace the elernents, contact

the Technical Service Departrnent of your nearest Fisher

Branch"

Door Seal (see Figure Z): To rernove the door seal, rernove

the door as described in the preceding paragraph. Then,

loosen the l3 screws beneath the sea1, and pu11 the used

seal out.

To install a new door sea1, perforrn the following:

(Jse a screwdriver and force the oven charnber away

frorn the front panel about I/16 inch.

Rernove one of the screws at the center of the

bottorn edge and then starting with either end of

the door seal, install the seal in the space and

replace the screw. Do not tighten the screws

cornpletely until the seal is cornpletely installed"

Continue to install the entire seal around the door

opening. Do not allow the seal to overlap in the oven

charnber.

When the seal has been cornpletely installed, tighten

all screws.

Replace the door and readjust the rnagnetic door latch

and door hinges as described in this section under

Adjustrnents.

z"

3.

4"

bc.

d.
FIGURE 2-INSTALLATION OF DOOR SEALt---

FUGURE 3-VItrW OF INTERNAL COMPONENTS
REPLACEMENT PARTS

A list of replacernent parts for both the Junior and Senior ovens is given below.

Whenever possible, each itern is identified with respectively the sarne code as

that shown on the wiring schernatics or on Figure 3, a view of the internal cornponents" Unless otherwise indicated, the parts fit all rnodels.

Callout Code

1rign"" :1 (SchEilatic)

S1

THM1, Z

PLZ

PL3

HTRI, Z

HTR3

Part

L.g

Toggle Switch

Sprocket Assernbly

Therrnostat

Scale As sernbly

Sprocket (Srna11)

Spring

Bead Chain

Safety Sentinel Larnp

Pilot Larnp

Therrnorneter

Ternp. Control Dial

DOOr SealrFtl.rK

Door Seal'K'i

Strip Heaters

150 watts'i '1.

250 watts

Strip Heater

!QQ s73ffs>!>i<>k'

Heater Strap

Anticipator Clip

Anticipator Hood

13-244-I-056 09748

L3-244-L-03r 06676

L3-244-r-0215 098r6

13-244-3-OI 0g8zr

13-244-L-0ZII OgSIZ

L3-244-L-052 09745

L3-244-r-Org 0973t

L3-244-t-0I8 09730

PL-07-R 0g7IZ

PL-06-W 06654

13-246 L3-246

KN-101-r 062g9

t3-244-3-O44 09895

L3-244-r-024 09735

Number

OLD

HTR-01-1

HTR-01-Z

HTR-01-3

I3-244-L -087

I3-244-r -017

t3-244-I -057

B

C

D

E

F

H

I

J

NEw'I.

17256

17250

09172

097 06

097 07

09?08

097 69

09729

097 49

For l15V Models Only:

G PLI

For 230V Models Only:

G PLl

Scale Larnp

Socket Base

Line Cord

Scale Larnp

Socket Base

Line Cord

P1

L3-244-L-029 09738

13-244-t-0304 17249

LC-3 06643

PI

L3-244-03r6

13-244-L -03 I 5

LC-7

'i'IJse new nurnber when ordering replacement parts.

'k'kJunior Model 201 only (L3-244-I)"

>k>i<*gsnio" Model 203 only (I3-244-31"
I

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FIGURE 4-JUNIOR OVEN

8

WIRING SCHEMATICS

FOR llsv OP€t?AT/Ottt

FOR 23OV OP€RATION

l50w

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YEttow YEttOW
FOR ,//5 /AL/ APERAT/ON

FOR ?SOYOLT OP€RAT/ON

__l L_

YEUOW

TI

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LFIGURE 5-SENIOR OVEN WIRING SCHEMATICS
ffi FTsHER scrENTrFrc coMPANY

lnstruments, Apparatus, Furniture and Chemicals for Laboratories.

ATLANTA BOSTON CHICAGO CLEVELAND HOUSTON NEW YORK PHII"ADELPHIA

690 Miami Circle, NE 461 Riverside Ave. 1458 N. Lamon Ave. 26401 Miles Ave. 4102 Greenbriar Dr. 633 Greenwich St. Gulph Road (Route 23)

Atlanta, Ga.30324 Medford, Mass.02155 Chjcago, 111.60651 (Warrensville Heights) P.0. Box 665 28 New York, N. Y. 10014 Kins of Prussia, Pa. 19406

Cleveland, Ohio 44128 Houston, Texas 77005

PITTSBURGH ST. LOUIS UNION, N. J. WASHINGTON EDMONTON MONTREAL TORONTO VANCOUVER

711 Forbes Ave. 2850 S. Jefterson Ave. 1080 Lousons Rd. 7722 Fenton St. P.0. Box 3840, Station D 8505 Devonshire Rd. 184 Railside Rd. P. 0. Box 2149

Pittsburgh, Pa. 15219 St. Louis, M0.63118 Union, N. J.07083 Silver Spring, l\|d.20910 Edmonton, Alta. Monkeal g, Que. Don Mllls, ont. Vancouver 3, B. C.

IITHO IN U. S A

7 -66D