Approved / for public release by the

Director of the National Institute of

Standards and Technology (NIST) on October 9, 201 5.

;ed

/-

NATIONAL BUREAU OF STANDARDS REPORT

7015

CENTRAL FURNACE CONTROL AND RECORDING FACILITY

by

D* Gross

W. H. Bailey

E« W* Bender

A* F» Robertson

U. S. DEPARTII3ENT OF C0MA1ERCE

NATIONAL BUREAU OF STANDARDS
THE NATIONAL BUREAU OF STANDARDS

Functions end Activities

The functions of the National Bureau of Standards are set forth in the Act of Congress, March

3, 1901, as amended by Congress in Public Law 619, 1950. These include the development and

maintenance of the national standards of measurement and the provision of means and methods for making measurements consistent with these standards; the determination of physical constants and

properties of materials; the development of methods and instruments for testing materials, devices,

and structures; advisory services to government agencies on scientific and technical problems; in- vention and development of devices to serve special needs of the Government; and the development

of standard practices, codes, and specifications. The work includes basic and applied research,

development, engineering, instrumentation, testing, evaluation, cahbration services, and various

consultation and information services. Research projects are also performed for other government

agencies when the work relates to and supplements the basic program of the Bureau or when the Bureau’s unique competence is required. The scope of activities is suggested by the listing of

divisions and sections on the inside of the back cover.

Publications

The results of the Bureau’s work take the form of either actual equipment and devices or published papers. These papers appear either in the Bureau’s own series of pubhcations or in the journals

of professional and scientific societies. The Bureau itself publishes three periodicals available from

the Government Printing Office: The Journal of Research, published in four separate sections,

presents complete scientific and technical papers; the Technical News Bulletin presents summary

and preliminary reports on work in progress; and Basic Radio Propagation Predictions provides

data for determining the best frequencies to use for radio communications throughout the world.

There are also five series of nonperiodical publications: Monographs, Apphed Mathematics Series,

Handbooks, Miscellaneous Publications, and Technical Notes. Information on the Bureau’s publications can be found in NBS Circular 460, Publications of the

National Bureau of Standards ($1.25) and its Supplement ($1.50), available from the Superintendent

of Documents, Government Printing Office, Washington 25, D.C.
NATSONAL bureau of STANB5ARDS REPORT

ms PROJECT NBS REPORT

1002-00-10820 November 21, 1960 7015

CENTRAL FURNACE CONTROL AND RECORDING FACILITY

Fire Research Section

by

D, Gross

W, H, Bailey

E. W, Bender

A. F„ Robertson

ifVIPORTANT. ^iOTICE NATIONAL BUREAU OF STANDARDS REPORTS are usually preliminary or progress accounting documents

intended for use within the Government. Before material in the reports is formally published it is subjected

to additional evaluation and review. For this reason, the publication, reprinting, reproduction, or open-literature

listing of this Report, either in whole or in part, is not authorized unless permission Is obtained in writing from

the Office of the Director, National Bureau of Standards, Washington 25, D. C. Such permission is not needed,

however, by the Government agency for which the Report has been specifically prepared if that agency wishes

to reproduce additional copies for its own use.
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CENTEAL FURNACE CONTROL AND RECORDING FACILITY

Fire Research Section

by

D, Gross, W. H. Bailey, E. W. Bender, and A. F. Robertson

ABSTRACT

A description is provided of the fire endurance furnace

control and program equipment and of equipment currently

used for measuring and recording temperature and milli'^

volt signals. A one-hundred channel digital data printout system which has been recently Installed is described

in some detail. It provides for data readout at the rate

of 60 channels per minute. Direct indication of temperatures with the use of chromel-alumel thermocouples is

provided in the range of 0-1400®C with an accuracy of

±4*C. Millivolt signals may also be measured over the

range of 0-14.00 mv with an accuracy of ±0.04 mv. Provision is made for automatic programming both the number

of circuits to be scanned as well as which of these will

be measured in terms of temperature, or millivolts.

1 . INTRODUCTION

During the last six or eight years, a central control and dat|a

recording facility has been used for most of the temperature measurement

work performed in the Fire Research Section. Recently, automatic equipment has been installed to permit digital recording of as many as one hundred temperature millivolt signals. It appears desirable for

record purposes, and as an instructional guide to staff members, to provide a brief description of the complete system.

2. CENTRAL CONTROL AND RECORD FACILITY

As shown in the block diagram. Fig. 1, the facility consists of five

major components;
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The instrument jack board and associated wiring,

2o The potentiometric recording unit,

3o The potentiometric indication unit,

4o The automatic digital recording unit, and

5. The furnace program control unit.

The purpose and use of the various portions of the system may be best

discussed individually.

2.1 Instrument Jack Board

This board. Fig. 2, which is 14 in. wide by 10 ft in length is

mounted on the wall of the Control Room. It contains 6 rows of duplex

jacks. Five of these rows contain (a) 96 jacks connected by paired

copper leads to junction boxes in the various laboratories and (b) 12

jacks for connection to chrome 1-alumel compensation thermocouples

mounted in these junction boxes. Fig, 3 indicates the purpose of the

various jack connections on this board. Fig, 4 is a schematic diagram

which shows the location of the junction and jack boxes and also lists

the input circuits currently available in the various buildings. The

sixth or "instrument” row of jacks contains, in addition to the 96 jack

connections, 12 jacks connected by chrome 1-alumel wire to the Input

circuits of the 8 potentiometric recorders and the four potentiometric

indicators. Each of the 9i> jacks in this row is connected to;

1. the potentiometric indicators through manual switches.

These switches have an "off” position which permits their complete

removal from the jack board.

2. the eight potentiometric recorders. Each recorder is a 12-channel unit which scans in sequence the 12 input circuits and re- cords the data in the form of a temperature- time record.

3. the input scanning switch of the digital recording unit.

It will be readily seen that by use of this jack board and a supply

of jumper lines and plugs, any thermocouple input circuit may be con- nected to any measuring circuit jack connection. In this way, it is a rather simple matter not only to connect geographically remote laboratories for recording and measuring purposes, but also to achieve great

flexibility in the manner in which connections are made.
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Potentioraetric Recorders

These units, Fig. 5, are standard commercial 12-point recorders

modified with a special input circuit. They are calibrated for use with chrome 1 -a lumel thermocouples and have temperature ranges and print

cycle times listed in Table 1.

2.3

Potentiometric Indicators

These 4 instruments, Fig. 2, are connected through a 2-pole,

24-position switch, with an additional ’’off" position, in parallel with

the lines to the 2 other readout systems. These indicating units, also

calibrated for use with chromel-alumel thermocouples (see Table 1), were

intended and have been used for manual data readout purposes. Since,

when used they are placed in parallel with the recording potentiometric

instruments, there is the possibility of feedback between instruments

when a common thermocouple circuit is being scanned. Because of this,

personal judgment must be employed during their use. These indicating

instruments should always be in the "off" position during operation of

the digital recording unit.

2,4

Modified Input Circuit

The modified input circuit used with these recorders and indicators

is shown in Fig. 6. This circuit is provided to develop an emf correction,,

inserted in series with the temperature signal, to compensate for differences in temperature of the thermojunctions formed at the potentiometers

and at the junction or jack boxes in the various laboratories due to the use of copper extension leads. These leads were used for purposes of

economy, but also to reduce the resistance of the lines which, in many

cases, are as long as 300 ft.

This type of temperature compensation has proved quite adequate for

the needs involved. In applying it, the only significant modification

to the recording instruments is the use of a heavy metal box as an en- closure for the input terminal board on multi-channel instruments. This

was found necessary to reduce a slight temperature differential across

the width of the board.

2,5

Automatic Scanning and Digital Recording System

This unit. Fig. 7, permits automatic recording of up to 100 different

thermocouple or millivolt signals. The scanning can be either manually

controlled or automatically programmed at the rate of one channel per
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second. Provision is incorporated for progrannning the channels to be

recorded (or skipped) and selection of either a temperature or millivolt readout. Direct - indication of temperatures with the use of

chrome 1-alumel thermocouples is provided in the range of 0-1400“C with

an accuracy of ±4°C, Millivolt signals may also be measured over the

range of 0-14,00 mv with an accuracy of ±0.04 rav. The balancing time

of the measuring potentiometer is on the order of 0,5 sec. The unit

is built to permit scanning the 96 jack board circuits with initiation

signals (or scan cycle periods) of 1/2, 1, 5, 10, 30, or 60 min. Provision is also included to completely remove the measuring circuit from

all input leads in the standby or 00 channel position. In this position,

a calibration signal is measured and printed out along with time at the

start of the scan cycle. Circuit diagrams and further description of

the operation of this unit are included in Appendix 1.

2.6 Furnace Program Control Unit

This unit, Fig, 8, is completely separate from the data measuring

and recording circuit, and is fitted with its own 12- jack input plug

board. This board permits input either of a single or of multiple

thermocouples signals to the measuring circuit. If multiple inputs are connected, the internal circuitry of the panel is such as to effectively

connect these inputs in parallel through 470 ohm swamping resistors.

This permits development of an emf representative of the average of that

of the individual inputs. The potentiometric measuring circuit coapares

the input signal with a self-generated signal corresponding to the time

temperature relationship which it is planned to follow. The measuring

circuit of this unit Is of the high input resistance type and, as a result, does not present any significant load to the input signal. The

correction signal generated, is fed to a motorized valve in the air or

gas supply lines of the various fire endurance test furnaces. In this

manner the control unit programs the time-temperature conditions to be

developed during furnace operation. Since the unit is frequently used

with 12 furnace temperature input signals in parallel, failure of one

or more thermocouples may cause an erroneous average signal, provision

has been included to periodically open each of the input circuits

sequentially on a one-minute cycle. Thus, if any thermocouple is providing a temperature signal significantly different from the average

of the others, this will be evident from the shape of the recorded

record. The circuit diagram is shown in Fig. 9.
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Further description and instructions on this control unit are included in Leeds and Northrup publications as follows:

a. Model S, Type G 60000 Series Recorder, Direction Book

77-10-5-1.

b. Series 50 Electric Control System, Direction Book 77-

33-1-12.

c. Series 50 Control Drive Mechanisms, Direction Book

77-9-1-5.

d. Control Drive Mechanisms, Direction Book 77-9-1-2.

Starting procedures for operation of each of the fire test furnaces

and the appropriate program control unit settings are listed in Table 3,
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APPENDIX

Automatic Scanning and Digital Recording System

The operation of the automatic scanning and digital recording system is summarized in the Datex Instruction Manual for System 14650-01

dated April 1960 and the following: Schematic Operational Diagram (Fig,

10), Scanning and Control Circuit Diagram (Fig. 11), Relay and Switch

Complement (Table 2), Leeds and Northrup Instruction Manuals for High

Speed Model S, Type G, Speedomax Recorder and Leeds and Northrup Dwg.

No. H-SSS-442-C-10 for the measuring and motor circuits.

A. Automatic Scanner

The heart of the automatic scanner consists of two permanent magnets

supported one above the other on the twin arms of a 100-tooth solenoidoperated ratchet armature. A total of 200 magnetically-operated mercurywetted contact switches are arranged in two circular tiers of 100 each.

The switch capsules, Clare Co. Type HGX-1003 or equivalent, are sealed

in glass, pressurized with hydrogen and potted within an impregnated

paper tube. Each switch consists of two poles and is double-throw ex- cept that the armature is common to both poles. Each step of the ratchet

armature actuates two switches, each of which opens a normally closed

contact for channel identification and closes a normally open contact

for the input signal. Mercury-wetted switch contacts require contact

protection in the form of the series resistor-capacitor networks shown

in Fig. 11 for the portion used for relay switching.

B, Description of Controls

1. Relay Chassis

a. Upper indicator shows channel being scanned.

b. Lower indicator shows type of signal being measured °C or mv. Provision is included for later adding visual digital signal

readout

.

c. "Temperature"-"millivolt ” switches control t 3q>e of signal. Temperature will be read out unless the tens and unit switch cor- responding to the circuit being scanned are in the millivolt

position (right). On scan position, No. 99, readout is always

that of temperature compensator in test area being used. On

position No. 00, a 10-mv signal is always read. These. two signals serve as a check of operation of the system^ «- Failure or erroneous indication of either signal should be checked prior

to use of system.
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d. "Record”-"No Record" switches control the scanning operation.

Signal will be measured on all channel positions except when

the tens and unit switch corresponding to circuit being scanned

are set to "no record" position (right). This provides a fastaction run past those channel positions not required to be

measured. Switches cannot be set to skip channel Nos, 99 and

00'. These are used for system operational check.

e. Function Selector Switch determines the type of system operation.

(1) "Clock’ - lirintout; occurs on any preset channel at periods

depending on setting of system readout timing control

switch (1/2, 1, 5, 10, 30 or 60 minutes).

(2) "Manual" - In this position, the scanning stepper may be

set to any position desired by use of the manual ("jog")

pushbutton. In this position no skipping or fast action

run occurs and signal is printed at each scan position,

(3) "Program" - In this position, the initiation of readout

is controlled by system readout timing switch on Digital

Clock. Channels are scanned and recorded as programmed

on temperature, millivolt and record, no-record switches.

Scanning stops after print of compensator temperature at

position No, 99, Carriage returns and is ready to ' start

new line with print of GO. Scanning recommences as programmed

.

(4) "No Print" - System performs as under program except that no print takes place.

(5) "Run" - System performs as described for program, but

scanning is continuous and clock initiation is not re- quired for printing No. 00.

f. "Jog" Push Button is only operative with function selector

set on manual.

g. "Carriage return" push button causes carriage return on suceeding

print command. Button ineffective unless depressed when print

cycle starts.

h. "Power" switch controls 28 V DC supply furnishing power for

relays and scanner.

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2. Digital Clock (DC=106=4)

a. System readout timing selector is used for selecting time at

which scanning is initiated on "program" or readout period

when on "clock,"

b. "Time set" push buttons can be used to reset clock to zero

or any other desired time setting,

3. Leeds and Northrup Self “Balancing Potentiometer

a, "Record" switch connects potentiometer and servo balance sys“

tern for readout. This switch should be turned off if system

continues drive either up or down scale,

b, "Power" switch controls power to instrument,

c, "Chart" switch inside instrument door is only used when

graphical record is desired.

4. Control Chassis (K-106“lll)

a, "Power" switch controls power to instrument,

b, "Record" button provides a means for actuation of printer

without scanning,

5. Data/Log Printer (MC“203“39)

This is a modified bookkeepirg machine made by the Monroe Calcu=

lating Machine. Company ^ Inc, Contains conventional means for

supplying paper ^ adjusting carriage movements , etc,

C. Operating Seque.nce with Function

Selector Switch on "Program"

(See Fig. 10 and Datex Instruction Manual)

1, Contact closure in digital clock energizes R-105 which locks in

through its own contacts,

2. Next contact closure from one second clock energizes R-102, This

breaks lock-in circuit of R“10.5s closes print contacts^ and

energizes stepper solenoid.

IV

3, Print contact closure energizes relay K-122 in control chassis.

This closes relay K-120 briefly, thus storing analog signal.

Closure of relay K-122 also operates print solenoid on printer

and digitized signal to digital solenoids through contacts 12

and 13 on relays K-101 to K=114, Remainder of print cycle is

mechanically completed.

4, One second clock contacts open releasing R-102 permitting arm on

scanner to step to next position,

5, On completion of printer operation contacts on printer open re- leasing relay K-121 which had previously locked in from operation

of the carriage return indicate switch on printer. Release of

this relay prevents further print of time signals until another

carriage return occurs.

D, Precautions

1. When using the automatic scanning and digital recording system,

all four of the manual scanning switches for the indicating

potentiometers should be in the "off" position. If the manual

switches and indicating potentiometers are to be used, the scanner should be stopped in position 00, In this position the scanner potentiometer will be connected to a reference voltage

source quite independent of the jack board and the carriage re- turn relay will not be energized.

2. The scanner should not be allowed to remain for lengthy periods

in the No. 99 position as this leaves the carriage return relay

energized and could possibly cause overheating and resulting

damage.

3. Since both scanner and individual Brown potentiometers are con- nected in parallel by the wiring in the jack board, it is important

for achieving accuracy in recorded data that no parallel input

connections be made between two or more Brown recorders. This

should not imply any problem with parallel connection of the inputs

of any single recorder. This restriction is also not necessary

when compensating thermocouple connection jumpers are not connected

for the recorders involved.
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4„ Failure of the digital recording system to provide as signal of

lOiOO in position 00 should be considered as evidence of some malfunction of the system and thus require maintenance.

E. Trouble Shooting Chart

Possible Cause and Cure

1. System does not operate. 1, Check power connections and

switches on each section.

2. Recording system operates,

but no signal on °C.

2. Check compensating thermocouple connection. Check

"record" switch on L & N

potentiometer. Check thermocouple jumpers on instrument

jack board.

3. Relay rack indicator lights

do not operate.

3, Check fuse on relay chassis

front.

4. All number lights super im^

posed on channel indicator.

4. Check fuse on 28 V power

supply.

5. System OK, but no signal in

standby condition (position

00^ .

5, Standardize relay Rrl04 locked

in. Increase R-104 series

resistance on relay chassis.

Possibly caused by interchange of relays R-104 and

R-105. Check 10 V power

supply.

6. Carriage, returns on 98 and

99 prints at start of new

1 ine

,

6, Carriage return relay R-107

does not have enough series

resistance. Adjust with

potentiometer on relay

chassis. This behavior can also result from condition

described in item 12,

7.

VI

Scan cycle starts at time 7,

other than that set on digital clock,

8, Scan cycle, does not start, 8,

9, Potentiometer drifts as with 9,

open circuit on No, 97 and 98,

10, No channel identification 10,

printout on channel No. 00,..

11. Carriage returns but stops 11.

before reaching end of run,

causing indentation of next

print record.

12, During program operation 12,

ratchet scanner stops operation and appears to be locked.

Check diodes in digital clock

rotary switch.

Check that system readout

timing switch on digital

clock is not "off," Check

that function selector switch

on relay chassis is at "program," "no print," or "run,"

This is normal operation

since these two points are

not used.

Normal operation.

Carriage returned from second

or third column print positions. This improper operation

is normal from such positions.

Could be remedied by programming

for return from later column.

This difficulty is normal if

manual carriage, return were employed and button not re- leased immediately on printer

operation. Release return

button earlier.

This fault is due to incorrect

adjustment of armature stop on ratchet resulting in backward

movement after being energized.

If this occurs at position when

prior point was set for no record

then clock stops and ratchet re- mains locked in energized position.

This can be remedied by adjusting

stop on scanner ratchet relay

armature.
v;

gn;i5aatbB b3J:b;5.mai ad .o.bo 8idT

ysIoT Ta-ar-Bos no qo:(S

, S-TU^BfirTB
TABLE 1

characteristics of potentiometric recorders and indicators

Recorder

Temp*

Range

(Chromel-Alumel)

°c

Print

Cycle

Sec

Indicator

Temp,

Range

( Chrome1 -Alume1

)

Full-Scale

Balance

Time

Sec

A 0“1400 ,15 1 0-1400 12

B 0-X200 2 2 0-1200 12

C 0-1200 15 3 0-1200 12

D 0-1200 15 4 0-1200 12

E 0-1200 15

F 0-1200 15

G 0-500 15

H 0-500 2

TABLE

2.

RELAY

AND

SWITCH

COMPLEMENT

u)

C

iH

O lU

CO 1-1 fo c \z

CO 4J cO CO CO

a CO CO

CO CO CO >4} f-H rH

Xi o 0) (U

D

u (U 0)

O

O Pi Pi Pi CO hJ Pi Pi

hJc

cO o o r-H 1—1 1

(1) <5 c o pq PQ H

CO>

nJ

cC r4

(U Pd CO

CO

G 4J CO 0) 0) O c p Pd •H d <u CO

4-1

H cO > (U >1

a ip 1-1

N CO •H 0> P >P

CO CO Pd o •o lU

U >, >1 cO CO

p Pd

CO CO CO rH 0) 0) CO

0) rH t-H (U

p

a TJ P Q CU od CO f3 P

ppi pd 3 M CO cO o. P O P P

bC bO o y P CO CO c C 44 o

*H 1-1 CO S p s

43 43 T3 c CO O O P p 4d 0> P P P 13 O O p bO

•H •P •P

U o p o & P 3 p

CO CO PM Pd

O

u PU

13O

1-) •K o P

cO CJ^

13 Pd

bt e o « CO 9 o rH CM cn -3- in

0) • o o O o O o a O o rH rH

Pd p£t Pd Pd Pd Pd Pd

(U

ti >1 >1 PS

ti

CO CO

1-H cO 1 0

CO

0) C4(U Pd r4 S

rH rH rH rH CO

PQ o FP o o

>1

CO rH

(U Pd

bO3 « •H o p tn p 3 s o rH

43 0>

HH

CO CO Pd CO

O rH cd PM P^

0) rH cO P <u CM fO

Pd iH 3 p

PM 3 P Pd 3 > o S

0) c M iH o •-O' PM p p P rH

PM 3 o p

u 'z

B <U P p 0) 3 pp P <U o p 3 H pq

CO Pd 0) 31Q CO 2 iH PM

PS 0) 0) o P 9S 3 bO CO •H 3

Pd eO P tJ

A rH Eh

•iHp 3 P CO (U o p P 3 CD O rH •H p^

CO P Or P u o •H CO

CO CO c O 3

ppO

H Ph Pd on

00

p cn 00 P3 <f o o rH T3 -H 1 3

Pj 3 V>

ri. » td rH P

rH 3 3 3 P P P o 3 P 3 « rH O ^ * CJ PM O

vO ri. 00 <T> o o O O O rH < B

C rH rH r-H rH

Pd Pd Pd Pd pi ic

Relays

RO,

R1,„..R9

correspond

to

the

channels

whose

units

digits

are

1,

2,...0c

Relays

ROO,

R10,...R90

correspond

to

the

channels

whose

tens

digits

are

0,

1,<,..9,

e.g.,

scanne

in

position

19

would

de-energize

relays

RIO

and

R8.

CO co

>-< <u

CO •H >^ 4J

CO 4J to to CO to CO CO CO CO cO c cO 03 to T—1 1 r-t t-H rH •H rH o (U cu 0) 0) (U 1 0) 0) (U CU )-l (U o

hJ C4 (Hi fii PS PS pS ps ps PS PU PS C

COO

OOO rH rH rH rH rH CM tH 3 1~< rH O'

COdO

•rH )H 4J cO rd

•H 4J

d

d

u

CO

O o o 4-1

O IH 4J 4J •H

<u

G 4J 4H 13

a (U

G o> cu #%G cu 3 3 cu CO <3i rH t-H iH m X r-ri rH rG ,G rH 0 rH

H bO 00 00 00 o 60 00 jd rd 00 Me 00

CxO 00 00 00 .s QJ 00 00 CO CO 00

O 00

O o o o CO T3

O o 3 3 o •rH o H H H H PS H H G G H s H o d H H H H cu 3 H H H H H H H

CO CO CO CO TO

G CO CO CO CO CO CO CO

CM CM Ph CM

GGGGG

G

G

CO CO CO COm

aQ CO CO CO

Q CO

uco m rd u <u o

Ji 4J o rd •H CM •U) o !3 iH 4-1 CO H •rH CO d

pQ CO Ml <i 3

EH rd 4J 4J Q o cu rd Ml cu G

fi o •rH

d 0 4H rd dS 13 d cu

•rH rd •rH o o CO o oo

4J

u o 4J 4J CJ cO

G 4J 4J CO •H •H 4-1 CO •iH •H •iH •rH 13 [3 o •H Ml P4 Ch CO CO 3 Q Ml O CO CO o o d cO M rC 4H u Ch d d d CJ

CU

u o C4

u o •rH cu }H o Ml

Q •u +J o o (U !5 13 3 o 3 r •iH 4H u rH CO o 4J CO 4J G & o o CU G cu •rH CU CO CO cu cu CO Ch PS G Q G §

T~J iH o H c c (U cu d St >H 4J 3 Ml cu G 3 CO CO o o cO •iH 00 CU oo cu PS PS •H G •H & cO •d cci o

4J 4J 4J i-H CO •fH Ml t4 cd

u 4-1 3 3 o d •H Me

O Med

CO CO CM G,

d •H 00 Ml

O Ml Ml

cO CO

d

d 3 CO 3 o cO 3 ceJ 3

Gt Cm

M

M

G s <3 CJ

G CJG

d <3

M o o O •iH <! C3^ G CTN 4J CJ^ CO c^ CO

CO CO

© CO o d O © • « 0£ © O O •iH O o O « o iH (N fO ITl vO rv, CO O o O o o o O o o o o O 3 o o o o rH iH i-H rH rH rH rH iH

Cl CO CO CO CO CO CO CO CO CO CO CO CO

TABLE

3.

STARTING

PROCEDURES

FOR

OPERATION

OF

FIRE

TEST

FURNACES

Indicates

valve

position

on

"AUTOMATIC";

controls

valve

position

on

"MANUAL".

List of Illustrations

Fig. 1.

Fig. 2,

Fig. 3,

Fig. 4,

Fig, 5.

Fig. 6

Fig. 7.

Fig. 8.

Fig. 9

Fig, 10

Fig. 11

Table 1

Table 2

Table 3

Block Diagram

Instrument Jack Board and Potentiometer Indicators (Photo).

Instrument Jack Board and Circuit Connections,

Schematic Location of Junction Boxes and Jack Boxes,

Multiple “point Potentiometer Recorders (Photo).

Thermocouple Input Circuits for Recorders and Indicators.

Automatic Scanning and Digital Recording System (Photo).

Furnace Program Control Unit (Photo)

,

Thermocouple Input Circuit for Furnace Program Control.

Schematic Opera|tional Diagram - Automatic Scanning and Digital

Recording System,

Scanning and Control Circuit Diagram - Automatic Scanning and

Digital Recording System.

List of Tables

Characteristics of Potent iometric Recorders and Indicators.

Relay and Switch Complement,

Starting Procedures for Operation of Fire Test Furnaces.
•V

' JE.

' V

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Fig, 2

Instrument

Jack

Board

and

Potentiometer

Indicator

Cli^CUlT

NUMB&R

THERMOCOUPLE

VD

2 in

VR

4mm QD ^ ^ H <

A 00 o 2 - CO

VP

00 «a“

instrument

J^C\C

BOARD

AND

cmcU\T

CONNECTIONS

FLOOR. TEST FuRNAce

1-06

49-54/

79-70 ' 79-9o 55-6fc

bldg 68

M

6

OFFICE

coKtrfiOL

R.oot^

/

1 X 1-12

/- column

/ 7FS7-

/ FURNACE

/ l-IZ

ra / —25-48

15 Tor /- 49-60

il 1 jol

/

•X 25-60

/\ F —r H-BLDG 65

CS !5k ~46

AND

sS‘A~n8h

acoustical

VLB test

APPAItATUB

r

hKTT

0^c< CoUEPlNQj PO/^fUAC^

\

(^- 73-96

^7^ ' ''

P]-' h/Z 0

0 JACK 60X - CHRoMFL-ALUME“L iVlRE

® JACK BOX - COPPER WIRE

© JUNCllO^ BOX

[6j number of CHPOMEl- AL 17MEL

CompematioW circuits

ALL JUNCTIO^J BOXES COKiTAiN) BS

circuits, including those not

^viRED INTO ^ciA Boxes

lo] ^ /3-24 \

WALL -A TEST

FURhJACE

BLDG €4

BLDG

thermocouple circuits WIRED

INTO DUPLEX TACK BOXES

64 1-Z4 , 73 -96

65 1 - 12 , 25-60

67 1- 96

68A 1 -6 , 25-42, 49-66, 73-JO

68 B 1-12, 73-54

FIG. 4 schematic location OF JX/MCT/ON BOXES AND -JACK BOXES
. Ii-.

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•
'

POTENTIONAETER

indicator.

VO

V!? n

< u V

thermocouple

input

circuits

for

potentiometer

RECOJ^DERS

AVD

INOIC^TORS

pig. 7 Automatic Scanning and Digital Record System

Fig. 8 Furnace Program Control Unit
*.

' "

. V

4.^ I*' _

' -Vi"' ••*'N V 4.

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r:'

j.'"

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THERMOCOUPLE

INPUT

CIRCUIT

PoR

FURN^CE

PROGRAM

CONTROL
r I ) 5 ,


CHANNEL NO

00

I 2

34

567

e9

10

I I 1213

14

I 5

16

I 7

18

I 9

0025

560

“H KAAr-

-4 KA^- H

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“H hAA/” H KAAr-

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-H KA/V" H h>AAr8 9

9 0 T2-10-

9 I T2-I -

9 2 T2-2 -

9 3 T2-3 -

9 4 T2-4 -

9 5 T2-5 -

9 6 T2-6 -

9 7 T2-7 -

9 8 T2- 8 -

9 9 T2-9 -

B

1 1

1 f

1 1 1

i 4 1

ii

5 16 "

1 I 1

1 1 1

1 1 9 10

1 1 1

II 12

RE6ULATEI POWER SUPF

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lie A.

F

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26 45

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U.S. DEPARTMENT OF COMMERCE

Frederick H. Mueller, Secretary

NATIONAL BUREAU OF STANDARDS

A. V. Astin, Director

THE NATIONAL BUREAU OF STANDARDS

The scope of activities of the National Bureau of Standards at its major laboratories in Washington, D.C., and

Boulder, Colo., is suggested in the following listing of the divisions and sections engaged in technical work. In

general, each section carries out specialized research, development, and engineering in the field indicated by its

title. A brief description of the activities, and of the resultant publications, appears on the inside of the front cover. WASHINGTON, D.C. ELECTRICITY. Resistance and Reactance. Electrochemistry. Electrical Instruments. Magnetic Measurements.

Dielectrics. METROLOGY. Photometry and Colorimetry. Refractometry. Photographic Research. Length. Engineering

Metrology. Mass and Scale. Volumetry and Densimetry.

HEAT. Temperature Physics. Heat Measurements, Cryogenic Physics. Rheology. Molecular Kinetics. Free

Radicals Reseav.ch. Equation of State. Statistical Physics. Molecular Spectroscopy.

RADIATION PHYSICS. X-Ray. Radioactivity. Radiation Theory. High Energy Radiation. Radiological

Equipment. Nucleonic Instrumentation. Neutron Physics.

CHEMISTRY. Surface Chemistry. Organic Chemistry. Analytical Chemistry. Inorganic Chemistry. Electrodeposition. Molecular Sti-ucture and Properties of Gases. Physical Chemistry. Thermochemistry. Spectrochemistry. Pure Substances. MECHANICS. Sound. Pressure and Vacuum. Fluid Mechanics. Engineering Mechanics. Combustion Controls. ORGANIC AND FIBROUS MATERIALS. Rubber. Textiles. Paper. Leather. Testing and Specifications.

Polymer Structure. Plastics. Dental Research. METALLURGY. Thermal Metallurgy. Chemical Metallurgy. Mechanical Metallurgy. Corrosion. Metal Physics.

MINERAL PRODUCTS. Engineering Ceramics. Glass. Refractories. Enameled Metals. Constitution and

Microstructure.

BUILDING RESEARCH. Structural Engineering. Fire Research. Mechanical Systems. Organic Building Materials. Codes and Safety Standards. Heat Transfer. Inorganic Building Materials. APPLIED MATHEMATICS. Numei’ical Analysis. Computation. Statistical Engineering. Mathematical

Physics.

DATA PROCESSING SYSTEMS. Components and Techniques. Digital Circuitry. Digital Systems. Analog

Systems. Applications Engineering.

ATOMIC PHYSICS. Spectroscopy. Radiometry. Mass Spectrometry. Solid State Physics. Electron Physics.

Atomic Physics.

INSTRUMENTATION. Engineering Electronics. Electron Devices. Electronic Instrumentation. Mechanical

Instruments. Basic Instrumentation.

Office of Weights and Measures. BOULDER, COLO.

CRYOGENIC ENGINEERING. Cryogenic Equipment. Cryogenic Processes. Properties of Materials. Gas

Liquefaction.

IONOSPHERE RESEARCH AND PROPAGATION. Low Frequency and Very Low Frequency Research. Ion- osphere Research. Prediction Services. Sun-Earth Relationships. Field Engineering. Radio Warning Services. RADIO PROPAGATION ENGINEERING. Data Reduction Instrumentation. Radio Noise. Tropospheric Measurements. Tropospheric Analysis. Propagation-Terrain Effects. Radio-Meteorology. Lower Atmosphere Physics.

RADIO STANDARDS. High frequency Electrical Standards. Radio Broadcast Service. Radio and Microwave

Materials. Atomic Frequency and Time Standards. Electronic Calibration Center. Millimeter-Wave Research. Microwave Circuit Standards.

RADIO SYSTEMS. High Frequency and Very High Frequency Research. Modulation Research. Antenna Research. Navigation Systems. Space Telecommunications.

UPPER ATMOSPHERE AND SPACE PHYSICS. Upper Atmosphere and Plasma Physics. Ionosphere and

Exosphere Scatter. Airglow and Aurora. Ionospheric Radio Astronomy.