MiBecisionScisrffic lmportant lnformation

lnstructions

PRECISION

Vacuum Oven

Model 19

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 SCIENTIFIC, INC. makes no representations or

warranties with respect to this manual. In no event shallPRECISION

SCIENTIFIC, INC. 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, contact customer service:

800-621-8820 Ext 8

312-227-2660 Ext 8

FAX. 312-227-1828

lnstallation and Operation

From the USA/Canada/Mexico:

Phone: 312-227-2660

Toll Free: 800-621-8820

FAX 312-227-1828

Precision Scientific, lnc.

3737 W. Cortland St.

Chicago, lL 60647-9987

USA

Manual Part No: 3'14689309

Revision - Dated September 16

lnternational:

Phone: 312-278-8668

FAX: 312-227-4767

1 993
NlReclsiurScisrffic

Table of Contents

Page

lmportant lnformation ........................ 1

Table of Contents ...... ........2

lnstallation and Adjustment ........... 3-4

Vacuum Operation ......... 4-5

Periodic Maintenance ........................ 5

Manual Part No: 314689309

Revision - Dated September 16, 1993

Page

Door Gasket Compatibility ................ 6

Maintenance of Stainless Steel ......7-8

Specifications......... ........... I

Replacement Parts List ................... 10

Wiring Diagrams ........11-12

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NlnecisiorScisrffic lnstallation

INSTALLATION AND OPERATTON INSTRUCTIONS

MODEL 19 VACUUM OVEN

NOTE

Reler to the packing chxklist for the /lst ol acc€ssones

sentwith this unit Make ceftain you have alt accessones bfore destroytng tha shipping container and packing

material.

Position Vacuum Oven

Place the oven on a bench or stand at a convenient working

height.

Maintain a minimum of 12 inches cleannce btween the

oven and any combustble surfaces.

lnstall Shelves

Two (2) shelves are provided with the oven. Remove the wrapped shelves lrom the chamber. Unwrap lhe shelves and place in the chamber as desired.

NOTE

Heaters are located on side wails of chambr. placing

an item in direct contact with the srde wal/s may cause

overheating ol the item.

lnstall Thermometer

Hang the supplied thermometer onto the thermometer hook

located near the left lront corner ol the chamber.

Check vottage and watts stan'E'd on the data ptaa lor c3tnpattility Eford connectng oven to pwer sou/ca. The daa ptate can b found iear he {ii na. n,st

ens ure th at the power swrfch ls i n tha ;otf psition.

Control and lndicator Description

1. Power Switch. Applies power to the oven heater controis.

2. Temp. Control. Begulates the oven temperafure.

3. Heating lndicator. lndicates when the oven is being heated.

4. Thermometer Hook. provides a means of installing a ther- mometer for monitoring the chamber temperature with a

glass column thermometer.

5. Vac_uum Gauge. lndicates chambervaqlum in INCHES OF MEBCURY.

6. Hose connections. Used for connecting MINUMUM r/c

inch vacuum tubing between oven and v'acuum pumping

systems, or other apparatus.

7. Valves. Used for evacuating chamber, confolling vacuum,

or for bleeding air and otheigasses ,nio cframLr.

Vatvcr (I)

Hosc I

Conneclorr at,.fr. 

, ,

\

Connect Power Cord

Porcr SwttchT)
Vineclsiurkisrffic

Temperature Adjustment Vacuum Operation

Procadure t betow -::': standad modet 5831

Vacuum Ovens. tl you have or&red your mdel with

an qtional salaty contrct, skip prfitldure I and reler

to ProE'edura ll.

NOTE

When the ovan is new and ls first heated, the insutation

will becpma scorchccl ancl gome smoka and buming

odor will occut. lt is normal for this condition to last 2

to 3 hours at high haat.

Vrcuum Opcratlon

The lollowing intormation ssrves as a guide to operalcof lhe vacuum system.

Vacuum Ovan PcrformlncG rl or Balow 1 mm Abrolult

The following pumping s),stem capacities BrB hec€SSB-,

lo maintain vacuums at or below 1 mm Absolute:

'l .50 liters per minute at 1 mm mercury.

15 liter per minute at 100 microns mercury.

150 liters per minule at ,lO microns mercury.

Th€ lotal variabla leak rete of the oven is 3 inches of me..

cury p€r cubic loO per 24 hours at 29 to 26 inches of mercurr

Capaelty ol Vecuum Pump

Precision Scientific, lnc. recommends using a vacuupump with tour (4) times ths capacity of the varia'ble leak ra:e

and load requirements. A mechanical, positive displaceme-:

type vacuum pump with th€ proper frea air capacity ratrr,;

will give substanlially constant pumping speed to its ultima:e

pressure.

However, a positive displacement pump may ovacuate tnE

chamber too slowly belore 1 mm, precision Scientilic, ln:

racommends the use of a diffusion pump properly mstche:

to lha mechanical pump lor evacuating ths chamber betol,

1 mm.

PROCEDURE t

Turn the power switch on. Switch light shoutd glow, indicating pow€r is available to the oven.

Tum the Temp. Control knob fully clockwise. The ,,Heating"

indicator will glow when the unit is heating. When ttre temp

eraturs reaches the desired operating level (as indicaled on

the thermometer) tum the Temp. Control knob counterclockwise until lhe "Heating" indicator iust turns ofl. Allow the

lemperature to cycle on and off savgral times (3 to 4 hour)

to mak€ sure ths oven has stabilized. Adjust the Temp. Con_

trol knob up or down as necessary.

PROCEDURE II

Turn the power switch on. Switch light should glow, indicating power is available to the oven.

- 

Tum the rcgulating control knob and the safety contrcl knob

fully clockwise. The regulaiing pilot light should glow, indicating th€ oven is being h€ated.

When the desired satsty tempsrature is reached (usually

2-3oC above th€ regulating tomperaluro) lum lhs satsty control knob counterclockwise until the satoty pilot light jbws.

At this time the regutating pitot tighr wilt turn ofi. Allow the

oven to cycle several times (3lo 4 hours) to sslablish the

desired salety temperature. Adjust the satety slntrol knob

up or down as necessary.

Tum the ragulating control knob counterclockwise untilthe

regulating or saloty pilot lighl turns ofi. Adjust the regulating

control knob down until the desired op€reting temp€rature

is obtainod. Allow the ovsn to cycle reveral timss (g to 4

hours) lo establish the desired operating tompsrature. The

regulating pilot light will cycle on and ofl, indicating normal

operation. The salety pilot light should stay ott.

ll at any time the satety pilot lighl glows, chack ths controls lo be sure the sat€ty control is nol sot below the

regulating control.
Vineclsiurfrisrffic

Vacuum Operation

nl

llitlr

Size of Tubing to Vacuum pump

For vacuum levels below 1 mm to 10 microns. use mtntmum r/r inch vacuum tubing, keeping the connections be_

tween the oven and vacuum system as short, straight, and

unrestnctecl as posstble.

Vacuum Sealing Agents

High vacuum silicone grease rs often necessary to provide a proper seal at tubtng connecttons, valve connecttons,

door seals, etc. This is especially tmportant at high vacuums. However, there are restrictions to using silicone

grease. depending upon the type of matenals placed in the

oven. Reler to the matntenance section of this manual for

restnctions.

Out Gassing

The operatron of the oven at high temperature while

evacuatlng the chamber will help drive ofl absorbed gasses

on the walls and other surlaces and lacilitate attainment of

high vacuums.

Evacuating Chamber

Connect vacuum tubing to either hose connection on top

of vacuum oven. Turn on the vacuum pump, then open the

valve on the oven. The vacuum gauge will indicate when the

desired pressure tevel is obtained. Once obtained. close the

valve, ancl turn ofl the vacuum pump. Air may be bled into

the chamber through the unused valve to raise the pressure

level.

Periodic Maintenance

1, lf the oven tails to maintain set temperature, it may indicate a probtem with the Temp. Controt, or possrbly a

heating element lailure. Contact your local service

representative.

2. Gaskets should be checked periodicaily for hardening,

shnnking, cletenoratton or other srgns oi wear. lt is advrsable to keep several gaskets available tor use as

replacements.

3. The oven is equrpped with silicone door gaskets, unless

specified otherwtse. Do not use silicone door gaskets

or vacuum grease when evaporattng solvents in the

oven or when using hrgh anarrne polnt oils. BUNA-N

gaskets should be used in applicattons when

evaporattng solvents or when ustng htgh analtne point

oils.

4. The interior finish or silicone gaskets may be damaged

by the following:

Diesel oil

JP-4 oil

MtL-0-5606

Hydraulic Fluids

Butyl Acetate

Carlron Tetrachloride

Ethylene Chloride

Gasoline

Kerosene

Zylene

Methyl Chloride

Stoddard Solvent

Toluene

Aromatic Chlorinated Solvent

Refer to the following chart as a guide to what type of

door gasket material is best sulted for your needs.

E

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DOOR GASKET MATERIAL COMPATIBILITY GUIDE

Fluoroctrbon (Viton) Silicone

Gcnrrel

Crnfruot 3 ltgh Ternpereture Llmtt

Low lcnrpcreturc Capaortrty

Dyumr sarvEa/Abrsson Resrslance corncresson

Set RG3Btrnca

Fluid Congrtibitity

Aad. lnorgaruc

Ac{t. OrgrnE

Agrn (Oryg.n, Oron€. Weather)

Ar

Alcolrols

Alcbhytes

Atkrhs

ArDrres

Anmrl Oils

Eslas. Alky' Ptblph8re {skyorot)

Estsrs. Aryl Pnosghrte

Esters. sitlclre

E$rars

Hydicfroon Fuels. AltpiatE

Hy(fctrbon F(E|S. Arorna uc

HydoclftEfl . ttloqenated

Hydroclrboo ott3, Hgh Anrhne

Hydrocrroon Ots. Low Andrne

trngrrmaabrlfy lo Gasses

K!tones

Sdlcon Ods

Vcgat.Ue Oits

Walcr/Stcam

4E2. F. 250. c

-103.F. -75.C

POOR

EXCELLENT

FAIR

GOOD

FAIR/POOB

FAIR

VERY GOOO

FAIR/POOR

FAIB/GOOO

POOR

EXCELLENT

POOR

FAIR/POOR

GOOO

POOR

EXCELLENT

GOOD

FAIR/POOR

EXCELLENT

VERY GOOD

GOOD

POOR

EXCELLENT

EXCELLENT

GOOD

EXCELLENT

GOOD

VERY GOOD

VERY GOOD

FAIR

POOR

GOOD

POOR

VERY GOOO

POOB

EXCELLENT

EXCELLENT

POOR

EXCELLENT

EXCELLENT

EXCELLENT

EXCELLENT

EXCELLENT

VERY GOOD

POOR

EXCELLENT

EXCELLENT

FAIFI

GOOD

EXCELLENT

EXCELLENT

EXCELLENT

VERY GOOD

GOO0

VERY GOOD

GOOD

GOOD

GOOD

GOOD

POOF

POOF

FAIF

POOR

POOR

VERY GOOD

FAIF

POOB

POOF

GOOO

EXCELLENT

FAIR

257.F.125.

-67'F, -55.C

EXCELLENT

VERY GOOO

137.F.225.C

-40.F. -40.C

VERY GOOD

VERY GOOD
Maintenance ol Stainless Steel

The tollowrng chart ts provided as a guide to cleaning the intenor surlace of your vacuum oven

EFFECTIVE METHODS FOR CLEANING STAINLESS STEEL

Cleaning Agent' Method ol Apptacstion" Ellect on Finish

Rouline Cleaning Soap, or ammonia, or

detergent and water.

Sponge with cloth, then

rinse with clear waler

and wipe dry.

Satistactory for use on all lrnrshes,

Smcars and

Fingcrprints

Arcal 20, Lac-O-Nu,

Lumin Wash. O'Cedar

Cream Polish, Stainless

Shine. or Wind-O-Shine.

Rub with cloth as

drrected on the package

Satisfactory tor use on all finrshes provrdes

barrier lilm to mrnimize pnnts.

Slubbom rpots and

3t!ant, baked-on

tplaner, end other

light dircoloretion3

Allchem Concentrated

Cleaner or Lusteel.

Apply with damp sponge

or cloth.

Satlstactory for use on all frnrshes

Samae. or Cameo

Copper Cleaner.

Rub with damp cloth Satisfactory for use on all finrshes il rubbrng

rs lrght.

Cooper s Starnless Steel

Cleaner, or Revere

Stainless Steel Cleaner.

Rub with damp sponge

or cloth.

Use in drrectron of polish lrnes on No. 4

(polished) finish. Use light pressure on No. 2

(rnill)tinishes and Nos. 7 and 8 (pohshed)

finishes.

Liquid NuSteel

Paste NuSteel, DuBois

Temp. or Aerogroom.

Household cleansers,

such as Old Dutch,

Lighthouse, Sunbrite,

Wyandotte. Bab-,O, Gold

Dust, Sapolio, Bon Ami,

Ajax, Comet. Off, or

Stainless Steel Super

Shrne,

Grade F ltahan pumrce,

Steel Bnght. Lumin

Cleaner. Zud. Restoro,

Sta-Clean. or

DuBois Staintess Steel

Polish.

Rub with dry cloth. Use

small amount of cleaner

Rub with dry cloth using

a small amount of

cleaner.

Rub with a damp cloth.

May contarn chlorine

bleaches. Rinse

thoroughly after use.

Rub with a damp cloth.

Rub with a dry cloth

using a small amount of

cleaner.

Use rn drrectron of po|sh lines on No. 4

(polished) finish. May scratch No. 2 (miil) and

Nos. 7 and I (pol'shed) finishes.

Use in directron of polish lrnes on No. 4

(pohshed) finish. May scratch No. 2 (miil) and

Nos. 7 and t (pslished) finishes.

Use in directron of polish lines on No. 4

(polished) finish. May scrarch No. 2 (miil) and

Nos, 7 and I (@lished) finishes.

Use in drrection of polish hnes on No. 4

(pohshed)finish. May scratch No. 2 (rnill)and

Nos. 7 and 8 (polished) frnrshes

Use in directron of polish lines on No. 4

(polished) linish. May scratch No. 2 (mill) and

Nos. 7 and I (polished) linishes.

Forms thin. hard sattn-sheen tinish that

resrsts grease stains, water marks.

fingerpnnts, etc.

Penny-Brite or

Copper-Brite.

No rubbing - iust spray

lightly on dry surface and

wipe off.
EFFECTIVE METHODS FoR OLEANING sTAINLEss STEEL (cont)

Cleening AEcnl' mcthod ol Application" Etlect on Finish

Hcat Tint or Heavy

Dircolorrtion

Penny-Brite or

Copper-Brite.

Rub with dry ctoth. Use in direction of potish lines on No. 4

(polished) finish. May scratch No. 2 (miil) and

Nos. 7 and I (potishect) finishes.

Paste NuSteet, DuBois

Temp, Tamite, or Kelox.

Rub with dry cloth or

stainless steel wool.

Use in drrection ol polish lines on No. 4

(polished) tinish. May scratch No. 2 (miil)and

Nos. 7 and 8 (polislred) finishes.

Revere Stainless Steel

Cleaner, Take-Otf, or

AC-60.

Apply with damp sponge

or cloth.

Use rn directron ol polish lines on No. 4

(polished) finish. May scratch No. 2 (milt) and

Nos. 7 and 8 (potished) linishes.

Allen Polish, Steet Bright,

Wyandone. Bab.O, Zud,

Dubrite. or Prepare Dex.

Rub with a damp cloth. Use in directron of polish lines on No. 4

(polished)tinish. May scratch No. 2 (miil) and

Nos. 7 and 8 (pohshed) tinishes.

Burnt-on Foods end

Grcere, Fetty Acids,

Milkrtonc (whcre

rwebbing or rubbing

i! not prrctical)

Easy-Otf, De-Grease-tt, 4

to 6% hot solutton of

such agents as trisodium

phosphate, or sodium

tripolyphosphate, or 5 to

15% caustic soda

solution.

Apply generous coating

Allow to stand lor 10-i5

minutes. Rinse.

Repeated application

may be necessary.

Excellent removal, satisfactory tor use on ail

finrshes.

Cleaning Agont' llethod ol Apptication" Etlect on Finish

Tanecious Deposits,

Rusty Dircolo?ltions

lndugtrial

Atmotpharic Stains

oakite No. 33, Ditac,

Texo 12, Texo N.Y.,

Flash-Klenz, Caddy

Cleaner, Turco Scale

4368 or Permag 57.

Swab and soak with clean cloth.

Let stand 15 minules or more

according to directions on

package, then rinse and dry.

Satisfactory for use on ail finishes

Satisfactory for all trnishes

Hard Wrler Spots

end Scale

Greage end Oil

Vinegar Swab or wipe with cloth. Rinse

rvith water and dry.

5% oxalic acrd, 5%

sulfamic acid, 5 to 10%

phosphoric acid, or Dilac,

Oakite No. 33, Texo 12,

Texo N.Y.

Swab or soak with cloth. Let

stand 10-15 minutes. Always

follow with neutralizer nnse. and

dry.

Satislactory for all finishes. Effectrve

on tenactous depostls or where scale

has built up.

Organic solvents such as

carbon tetrachloride,

trichlorethylene, acetone,

kerosene, gasoline,

benzene, alcohol. and

chlorethane n.u.

Rub with cloth. Organrc solvents

may be flammable and or toxic.

OBSERVE ALL PRECAUTIONS

AGAINST FIRE. Do not smoke

while vapors are present, and

BE SURE AREA IS WELL

VENTILATED.

Satisfactory tor use on all finishes

SUGGESTIONS:

" Use the milc,est cleantng procedure that wilt do the ,ob etleclively.

. Rub tn the ctlrectron o1 polish hnes lor maxtmum eflecttveness

and to avod mamng lne surlace,

. Rrnse thoro{Jghly with hesh water after every deanng operat|on.

. wrpe dry lo avod waler marks.

rOTES

'Us€ ol propnrtary names ls htendeO only to rld|c8le a type ol ct€aner. anc

does nol constttute an endo.sernent. nor ts otnrssron bt any propr€tary

cleaner to rrngly rts nadequacy. I shoutd be cmphasEed that ail producrs

should b€ us€d n strEt accofoance ilth nsln'tclons on package.

"ln all applicatrons a statnless steet wcDl or soonoe or tibrous brusn

or pads are re@mrnended. Avord use of orclrnary"steet w@t or steet

brushes lor scourrng stalnless steel.
&it+tf, w,-

SPECIFICATIONS

MODEL

Vacuum range Atmosphgre to 30,'Hg.'

with adequate pump

Temperature range 35o C to 2OOo C

Shelt capacity 0.55 sq. ft. (203 sq. cm)per shett

2 shelves standard

19

lnside dimensions. usable

lnches

Gentimelers

(w-D-H)

8x12xB

20x30.5x20

Outside dimensions

lnches

Centrmelers

(w.D.H)

13x 16x 18

33x41 x46

Standard electrical service

Optional eleclrical service

500 warls, 120 vAc

50/60 Hz, 4.2 Amps

500 watts. 220t240vAC

50/60 Hz,2 l Amps

Net wetght

Pounds

Kilograms

42

19

'within 10 Microns
REPLACEMENT PARTS LIST

MODEL 19 VACUUM OVEN

Part No. Description

244il6 Power Switch (120 Volt)

240600 Power Switch (220l24OYoll)

239189 Temp. Control (Thermostat)

220180 Temp. Control Knob

239184 Thermal Cut-Out

00356305 Pilot Light (120 Volt)

00356306 Pilot Light (2201240Yolt)

307089 Thermometer

269110 Vacuum Valve

252228 Vacuum Gauge

247416 Heating Element (All Voltages)

97054 Shelf

167331 Door Gasket, Silocone

64304 Door Gasket, Buna-N

201 1-055 Door Gasket, Viton

330259 Glass Window

542081 Door Assembly

93665 Door Hinge

222065 Door Handle

241078 Rubber Feet

WHEN ORDERING REPLACEMENT PARTS, PLEASE SPECIFY THE MODEL NUMBER

AND SERIAL NUMBER OF YOUR UNIT, AND DATE PURCHASED. THE MODEL AND

SERIAL NUMBERS CAN BE FOUND ON THE NAMEPLATE WHICH IS LOCATED NEAR

THE SERVICE CORD.

10
120 VOLT

# 220118200

4 BT,ACK COM

wHtTE REGUI-ATING

THERMOSTAT

D

BLACK

2

WHITE

11
22A1240 VOLT

# 220'-119201

THERMAL

CUTOFF

POWER

SWITCH 4 BI..ACK COM

^ REGULATING J THERMoSTAT

@

Bt.ACK

@

RESISTO

, 68K

12