Fluke 80T-150 User manual

(6)

Instruction

Manual

Model

80T-150

Temperature

Probe

INTRODUCTION

The

Model

80T-150

Temperature

Probe

self-contain-

temperature-to-voltage

converter.

designed

provide

direct

temperature

reading

when

connected

any

high

impedance

voltmeter

that

capable

resolution,

and

least

300

count

full-scale

readout

capability.

Two

temperature

ranges

are

provided,

and

either

can

jumper

selected;

-58

+302°F

-50

+150°C.

The

unit

housed

two

separate

assemblies;

atempera-

ture

probe

and

temperature-to-voltage

converter.

The

probe

contains

the

temperature

sensing

element

and

electrically

connected

the

temperature-to-voltage

converter

through

46-inch

shielded

cable.

Two

banana

plugs

with

standard

0.75

inch

spacing

are

provided

for

connecting

the

80T-150

the

voltmeter.

Operating

power

for

the

80T-150

derived

from

two

internal

batteries.

Typically,

they

will

provide

1000

hours

continuous

operation

before

replacement

necessary.

ON/OFF

switch

provided

the

temperature-to-voltage

converter

allow

battery

conservation

when

the

unit

not

use.

Temperature

measured

exposing

the

probe

tip

directly

the

material

measured

(liquid,

gas

solid).

direct

temperature

reading

displayed

the

voltmeter.

SPECIFICATIONS

The

80T-150

will

achieve

rated

accuracy

when

used

with

any

0.25%

DVM

which

has

input

impedance

MO.

Specifications

for

the

80T-150

are

given

Table

80T-150

OPERATING

NOTES

The

following

paragraphs

are

intended

familiarize

the

operator

with

the

80T-150,

shown

Figure

They

should

read

before

attempting

operate

the

probe.

Probe

Limitations

The

80T-150

probe

constructed

highly

durable

plastic

and

suitable

for

measuring

the

temperature

liquids,

gases

and

solid

surfaces

150°C.

When

measuring

temperature,

observe

the

following

pre-

cautions

prevent

damage

the

probe:

not

expose

the

probe

end

(probe

tip

plus

inches

probe

body)

temperatures

excess

+150

С.

The remainder

the

probe

body

should

not

exposed

temperatures

above

+70

С.

For

liquid

measurements,

recommended

applica-

tions

range

from

water,

lubricants

and

fuels

most

solvents.

Liquids

shallow

4”

can

measured

since

the

temperature

sensor

the

probe

tip.

CAUTION

Long

term

exposure

the

probe

corrosive

environments

will

result

pitting

and

deteri-

oration

the

aluminum

probe

tip.

Temperature

Scale

The

80T-150

capable

providing

temperature

mea-

surements

°C

°F.

See

decal

opposite

power

switch

for

assigned

temperature

scale.

Instructions

for

changing

temperature

scale

are

given

later

under

General

Mainten-

ance.

Table

Specifications

ELECTRICAL

Range

(field

selectable.

. .

50°С

+150°C

—58

internal

jumpers).

+302°F

Accuracy

1159106

+35°C

Best)

їн

ambient

FIO

ton

OLG,

decreasing

linearly

(5.4°F)

-50°C

and

+150°C

0°C

+15°C

and

+35°C

+50°

ambient

Add

1°C

(1.8°F)

above

Sensitivity

(807—150

output)

de/

°C

de/

°F

350V

peak

5.5

seconds

settle

within

2°

Voltage

Standoff

Settling

Time

for

50°

change.

Overall

Length

Power.

. .

Two

internal

disposable

batteries

(1.5V,

Size

№”)

Output

Termination....

GENERAL

100

(3.5

oz.)

1.33

meters

(52.5

in.)

1000

hours

continuous

use

Standard

0.75“

spaced

double

banana

plug

ENVIRONMENTAL

Entire

Unit

Storage

Operating

Altitude

<50000

ft.

<10000

ft.

—40

+70°C

+50°C

80%

non-

condensing

Temperature

Humidity

Application

Force

pounds

max.

(Probe

tip-to-measurements

surface)

80T-150

TEMPERATURE-

TO-VOLTAGE

CONVERTER

POWER

SWITCH

ON/OFF

BANANA

PLUGS

(0.75

”

SPACING)

PROBE

TIP

ЕЕ]

PROBE

CABLE

PROBE

BODY

Figure

80T-150

Features

Error

Sources

When

the

probe

пр

applied

solid

surface

draws

sinks

heat

from

the

surface.

Therefore,

the

measured

surface

has

low

mass

(е.р.,

transistor

case),

the

in-

dicated

temperature

may

lower

than

the

actual

temperature.

Similarly,

steady-state

error

gradient

exists

between

the

measured

surface

and

the

sensing

device

the

probe

tip.

This

due

the

flow

heat

from

the

measurement

surface

the

probe

body.

The

effect

the

steady-state

error

increases

the

differential

between

ambient

and

surface

temperature

increases.

determine

the

actual

surface

temperature

device,

both

the

heat-sinking

and

steady-state

errors

must

considered.

The

correction

curve

given

Figure

approximates

the

effect

both

error

sources

TO-3,

TO-5

and

TO-18

transistor

cases.

son

naa

зи

ГТА

ви

ЕД

DEGREES

ABOVE

AMBIENT

(°C)

4”.

INITIAL

SURFACE

TEMPERATURE

INDICATED

SURFACE

TEMPERATURE

DEGREES

ABOVE

AMBIENT

Figure

Initial

Case

Temperature

Above

Ambient

vs.

Meter

Reading

Above

Ambient

signals

applied

the

80T-150

probe

tip

can

also

cause

errors

temperature

measurement.

Figure

defines

the

signal

limits

that

can

tolerated

without

degrading

measurement

accuracy.

ай

ва

ма

Figure

Maximum

Signal

Limits

(Vrms)

Probe

Tip

OPERATION

Use

the

following

procedure

operate

the

80T-150

probe:

Connect

the

banana

plugs

the

80T-150

the

input

terminals

high

impedance

voltmeter.

Observe

polarity.

Select

voltage

range

that

will

provide

least

resolution

mV/degree),

and

full

scale

readout

that

will

encompass

the

expected

temperature.

The

range

digit

DVM

adequate.

Ignore

readings

less

than

1°

when

sensitive

DVM

used.

с:

Set

the

80T-150

power

switch

and

energize

the

voltmeter.

Firmly

touch

the

probe

tip

the

surface

Бе

measured,

expose

liquid

gas.

The

volt-

meter

will

display

the

temperature

degrees.

Vary

probe

angle

and

pressure

when

measuring

solid

surface

temperatures;

the

highest

stabilized

reading

will

the

most

accurate.

CAUTION

The

force

exerted

the

probe

tip

should

not

exceed

pounds.

THEORY

OPERATION

The

Model

80T-150

utilizes

the

negative

temperature

coefficient

semiconductor

(P-N)

junction

measure

temperature.

The

junction

thermally

integrated

into

the

probe

tip

and

comprises

one

leg

bridge

circuit

shown

simplified

circuit

diagram

section

Figure

Two

1.5V

batteries

are

used

power

both

the

bridge

circuit

and

operational

amplifier

U2.

Since

the

bridge

must

balanced

provide

0°C

and

0°

indica-

tions,

separate

range

temperature

scale

resistors

and

are

included

the

bridge

circuit.

When

shorted,

the

°C

scale

selected

and

the

bridge

calibrat-

null

0°C.

Conversely,

when

КВ

open,

the

scale

selected

and

the

bridge

calibrated

null

Е.

Deviations

above

and

below

0°

provide

bridge

output

approximately

2.45

mV/*C.

Figure

Simplified

Circuit

Diagram

Operational

amplifier

used

measure

the

bridge

output

and

scale

itto

mV/degree

signal.

Since

the

°C

and

the

°F

scale

are

sloped

differently,

the

scale

for

must

matched

with

the

scale

selected

for

the

bridge

circuit.

Shorting

resistor

selects

the

°C

scale.

Con-

versely,

when

КО

open

the

scale

selected.

Resistor

К4

calibrates

both

scales.

The

output

voltage

used

drive

the

external

voltmeter

taken

from

the

output

U2(P2)

and

the

reference

side

the

bridge

(P1).

Since

operating

inverting

amplifier,

its

output

used

the

low

input

the

volt-

meter.

This

enables

the

voltmeter

display

increase

temperature

increase

voltage.

GENERAL

MAINTENANCE

Access

Information

The

battery,

the

temperature

scale

jumpers

and

the

calibration

pots

are

located

the

interior

the

temp-

80T-150

erature-to-voltage

converter

assembly.

Access

these

locations

accomplished

removing

the

three

screws

from

the

bottom

side

the

assembly

and

removing

the

plastic

box.

Battery

Replacement

The

807-150

uses

two

1.5

volt,

size

alkaline

batteries.

They

provide

useful

operating

life

=1000

hours.

replace

the

batteries

pull

the

old

ones

out

and

press

the

new

ones

into

the

battery

holders.

Match

polarity

mark-

the

pcb.

Mercury

equivalent

N-size

batteries

may

installed

the

80T-150.

Temperature

Scale

Jumpers,

°C

°F

The

jumper

locations

for

selecting

either

the

°C

°F

temperature

scale

are

shown

Figure

The

absence

jumpers

both

points

indicates

selection

the

°F

scale.

The

presence

solder

bridges

both

points

indicates

selection

the

°C

scale.

Under

circumstances

should

one

point

open

while

the

other

bridged.

TEMPERATURE

SCALE

JUMPERS

80T-3001

Figure

Temperature

Scale

Jumpers

PERFORMANCE

TEST

Complete

the

calibration

procedure

without

opening,

the

temperature-to-voltage

converter

assembly

and

with-

out

making

any

calibration

adjustments.

Observe

the

readings

given

[brackets].

Other

readings

are

for

cal-

ibration

only.

CALIBRATION

calibration

cycle

year

recommended

maintain

the

unit

within

the

specifications

given

earlier.

The

equip-

ment

required

for

calibration

listed

Table

NOTE

Values

given

brackets

apply

the

Per-

formance

Test.

80T-150

Access

the

interior

the

temperature-to-voltage

NOTE

converter.

the

unit

calibrated

the?

scale,

inter-

action

will

occur

between

adjustments

and

R4.

Repeat

steps

and

until

read-

ings

are

obtainable

without

adjustment.

Determine

the

selected

temperature

(°C

°F).

See

marking

bottom

cover

decal.

Connect

the

80T-150

DVM

and

select

the

Table

Test

Equipment

Requirements

100

ас

range

(10

resolution).

Instrument

Minimum

Use

Recommended

Type

Specifications

Model

а.

Turn

the

80T-150

power

switch

and

immerse

Mercury

0.1°C

Princo

Model

the

probe

tip

inches

into

thermometer

moni-

Thermometer

Resolution

SAMA-CP45

tored

0°C

bath.

Allow

the

DVM

reading

stabil-

Dewar

Flask

1-pint

capacity

Thermos

ize

(2230

seconds).

and

Cap

(for

¡ce

bath)

Bottle

Metal

1-pint

capacity

Suitable

for

Glass

Container

boiling

water

Adjust

(see

Figure

6.)

obtain

the

appropriate

DVM

reading:

Digital

Volt

100

range

Fluke

Model

Meter

with

8600A

°C

0.00#0.05

[0+2

dc]

320501

мас

[32:04

то

de]

necessary,

additional

range

can

added

adding

solder

bridge

across

and

shown

Figure

Resolution

1000

range

with

100

Resolution

PROBE

REPLACEMENT

Immerse

the

probe

tip

approximately

inches

into

100°C

bath

and

allow

the

DVM

reading

probe

kit

(80T-150-7001k)

available

for

replacing

stabilize.

Change

DVM

range,

necessary,

for

damaged

defective

probes.

The

kit

includes

probe

°F

calibration.

and

cable

assembly,

four

metal

film

resistors

(R3),

and

installation

and

calibration instruction

sheet.

р.

Adjust

obtain

DVM

reading

which

agrees

LIST

REPLACEABLE

PARTS

with

the

bath

temperature

(BT)

monitored

mercury

thermometer.

Component

location

drawings

and

list

replaceable

ЗОЎ

BA<E0.05

дет,

[BTÆ2

mMmVide]

parts

are

shown

Figure

When

ordering

parts,

рго-

BTEO

de®

ВУСА

ОУ

de]

vide

description,

Fluke

ра

and

quantity

required.

NOTES:

Sensing

Probe

and

Cable

Assembly,

80T-150-7001

(includes

selected

resistor

R3)

Temperature-to-Voltage

Converter

PCB

Assembly

(order

80T-150)

Battery,

Alkaline,

1.5V,

size

Socket,

1-pin

Plugs,

banana

Resistor,

selected

(supplied

with

Assy)

Button,

switch,

green

(not

shown)

Housing,

bottom

(not

shown)

Housing,

top

(not

shown)

Shock

absorbers

(not

shown)

Decal,

bottom

(not

shown)

Decal,

top

(not

shown)

Screw

(not

shown)

Part

resistor

network

Unless

otherwise

noted,

all

capacitance

and

all

resistance

ohms.

All

voltages

measured

with

respect

TP1.

431023

478735

343285

352716

432575

527747

527739

428441

534792

534784

183574

80T-150

80T-1601

Temperature-to-Voltage

Converter

PCB

Assembly

SELECT

Cap,

disc,

0.01

+20%,

100V

ас

Cap,

Ta,

2.2

+20%,

20V

Res,

metal

film,

1.62k

+1%,

1/8W

Res,

variable,

2k,

1/2W

See

Final

Assembly

Res,

variable,

50k

1/2W

Switch,

slide

Resistor

Network

Resistor

Network

IC,

linear

amp

Diode,

zener,

1.22V

Contact,

Battery

Figure

80T-150

Temperature

Probe

Schematic

149153

161927

282697

226076

225417

393629

616615

616656

418913

452771

477463

80T-1201

www.manualsplus.com

P/N

433565

June

1976

1020806

Кем

8/82

Litho

U.S.A.

01982,

John

Fluke

Mfg.

Co.,

Inc.,

all

rights

reserved.

Litho

U.S.A.

John

Fluke

Mfg.

Co.,

Inc.

P.O.

Box

С9090

Everett,

98206

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