Wahl 2500MX Manual de usuario

Este manual sirve para los siguientes modelos

14

Tabla de contenidos

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W

-683

Rev G

Revised 02/03/23

HEA

T

-

PROBER

®

POR

T

ABLE

THERMOCOUPLE

THERMOMETERS

INSTRUCTION

MANUAL

LCD

Models

LED

Models

2500MX

1370MX

2500M

2500MVX

1370MVX

1370M

3200MX

1770MX

3200M

3200MVX

1770MVX

1770M

TCMR-K

TCMR-

KX

TCMRK-VX

RECEIVING

INSPECTION

Check

your

new

W

ahl

Portable

Thermocouple

Heat-Prober

Thermometer

upon

Receiving

to

assure

that:

1.

It

has

not

been

physically

damaged

in

transit.

2. All

parts

are

included.

Then,

plug

in

the

probe

at

top

and

turn

it

on

to

see

that

it

reads

room

temperature.

If

a

fault

is

determined,

take

the

following

steps:

1.

Notify

the

W

ahl

factor

y

of

the

difficulty

.

Give

model

number

and

description.

W

ahl

will

authorize

return,

and

notify

our

service

department

to

receive

the

unit.

2. Return

the

instrument

in

its

shipping

container

to

the

factor

y,

freight

pre-

paid.

Repairs

will

be

made

under

warranty

or

at

regular

service

cost.

3.

Prepare

a

“Repair

Information

Form”

as

shown

in

Section

12.0

and

return

with

the

instrument.

This

is

ver

y

important.

W

e

need

the

information

to

diagnose

the

problem.

If

there

is

no

information

returned

with

the

unit,

it

will

slow

up

the

repair

process.

ii

T

ABLE

OF

CONTENTS

Page

RECEIVING

INSPECTION

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.ii

1.0

INTRODUCTION

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.1

2.0

OPERA

TION

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.3

2.1

Meter

Operation

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.5

2.2

Peak

Hold

(MAXI-TEMP)

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.5

2.3

Batteries

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.5

2.3.1

Recharging

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.7

2.3.2

Low

Batter

y

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.7

2.3.3

Continuous

Operation

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.7

3.0

PROBES

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.8

3.1

Open

Probe

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.11

3.2

T

emperature

Sensors

in

use

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.11

4.0

SPECIFICATIONS

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.14

5.0

CALIBRA

TION

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.17

5.1

V

oltage

Regulator

Adjustment

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17

5.2

Low

Batter

y

Adjustment

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.17

5.3

Calibration

Using

W

ahl

Calibrator

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.18

5.3.1

Zero

Adjustment

Using

W

ahl

Calibrator

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18

5.3.2

Span

Adjustment

Using

W

ahl

Calibrator

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.18

5.4

Calibration

With

a

Millivolt

Sour

ce

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.18

5.4.1

Zero

Adjustment

with

Millivolt

Sour

ce

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.18

5.4.2

Span

Adjustment

with

Millivolt

Sour

ce

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.20

5.5

Thermal

Calibration

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.21

5.6

Calibration

with

Thermocouple

Simulator

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.22

5.7

T

A-70

Thermocouple

Calibrator

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.22

6.0

THEORY

OF

OPERA

TION

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.27

6.1

V

oltage

Regulation

Cir

cuitr

y

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.29

6.2

V

oltage

Reference

Cir

cuitr

y

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.29

6.3

Front

End

Cir

cuitr

y

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29

6.4

Cold

Junction

Compensation

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.30

6.5

Dual

Slope

A/D

Converter

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.30

6.6

8048

Microprocessor

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31

6.7

Waveforms

and

T

iming

Diagrams

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.31

6.8

Low

Batter

y

Indication

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32

iii

7.0

BASIC

TROUBLESHOOTING

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.33

8.0

MAINTENANCE

AND

REPAIR

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.36

8.1

LED

and

LCD

Diagnostics

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.36

9.0

APPENDIX

IPTS-86

AND

IPTS-90

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.42

10.0

ADDITIONAL

PROBES

AND

ACCESSORIES

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.51

11.0

RETURN

FOR

REPAIR/CALIBRATION

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.52

FIGURES

Page

Figure

1-1

Microprocessor

Based

Thermocouple

Digital

Therm.

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.2

Figure

2-1

Digital

Heat

Prober

Major

Features

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.4

Figure

2-2

Rechargeable

Batter

y

Pack

Compartment

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.6

Figure

3-1

Heat

Prober

Thermocouple

T

ypes,

Model

Numbers

.

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.

.8

Figure

3-2

Standard

W

ahl

Probes

.

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.10

Figure

3-3

Extension

Probe

Handle

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.10

Figure

3-4

Molten

Metal

Dip

Stick

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.12

Figure

5-1

W

ahl

Calibrator

T

ypes

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.21

Figure

5-2

Heat

Prober

With

W

ahl

Calibrator

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.24

Figure

5-3

LED

Adjustment

Points

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.25

Figure

5-4

LCD

Adjustment

Points

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.26

Figure

6-1

Program

Flow

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.28

Figure

6-2

Microprocessor

Control

Functions

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.32

Figure

7-1

Wiring

Diagram

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.35

Figure

8-1

Block

Diagram

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.39

Figure

8-2

LED

Component

Layout

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.40

Figure

8-3

LCD

Component

Layout

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.41

Figure

11-1

Additional

Probes

and

Accessories

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.50

iv

1

1.0

INTRODUCTION

W

ahl

Thermocouple

Digital

Heat-Prober

Thermometers

are

precision

Instruments

for

measuring

temperature,

with

special

attention

to

ruggedness

of

design.

They

provide

the

certainty

of

a

digital

display

over

the

wide

range

of

temperatures

available

with

thermocouples

from

-100°F

to

3200°F

(-70°C

to

1770°C).

The

Heat-Prober

is

a

com-

plete

instrument

with

a

battery

power

supply

and

recharger.

It

is

inter

changeable

with

30

different

thermocouple

probe

configurations

designed

for

rapid

sensing

of

temper-

ature

in

ever

y

application.

The

Heat-Prober

series

accommodates

two

thermocouple

types.

1.

T

ype

K

(Nickel

Chromel-Nickel-Alumel)

for

general

purpose

use

from

-100

to

2500°F

(-70

to

1370°C).

2.

T

ype

S

(Platinum-Platinum/10%

Rhodium),

for

high

temperature

use

from

77

to

3200°F

(25

to

1770°C).

All

of

the

Heat-Prober

instruments

use

common

circuitr

y.

Microprocessors

hold

the

thermocouple

tables

in

memor

y

and

provide

digital

processing

and

control

of

the

information.

The

instrument

contains

the

unique

W

ahl

MAXI-TEMP®

digital

peak

cir

cuit,

which

gives

the

user

the

option

to

hold

the

highest

temperature

sensed.

The

peak-hold

cir

cuit

is

achieved

by

the

microprocessor

scanning

the

probe

input

temperature

to

determine

the

highest

temperature

reached.

This

peak

is

locked

digitally

and

there

is

no

drift.

The

meter

has

a

convenient

standard

miniature

temperature

compensated

connector

socket

for

easy

use

and

inter

changeability

with

similar

thermocouple

type

probes.

A

large

portion

of

the

cir

cuit

is

designed

with

low

power

C-MOS

components.

In

addi-

tion,

the

LED

displays

are

multiplexed.

The

result

is

a

design

which

provides

a

low

power

drain

and

allows

longer

operation

time

on

rechargeable

batteries.

Continuous

operation

is

also

possible

with

the

recharger

attached.

In

both

cases,

the

instrument

is

powered

from

the

batteries.

Both

LED

and

LCD

models

have

a

large

character

size

for

good

readability.

2

Figure

1.1.

Microprocessor

Based

Thermocouple

Digital

Thermometer

(LED

display,

left;

LCD

display,

right)

3

All

Heat-Prober

instruments

are

extensively

tested

in

environments

from

-20°F

to

140°F

for

specification

compliance

and

reliability

determination.

In

addition,

durability

testing

includes

impact,

vibration,

battery

life

and

running

life

tests.

Mean

time

between

failure

is

based

on

using

preburned-in

C-MOS

electronic

components

and

is

rated

at

16,000

hours.

The

9-volt

LCD

models

with

50-hour

standard

alkaline

batteries,

replaceable

from

the

back

cover,

are

designated

models

1370MVX,

1770MVX,

2500MVX

and

3200MVX.

They

have

the

same

specifications

as

the

rechargeable

LCD

models.

2.0

OPERA

TION

(See

Figure

2-1)

Insert

probe

into

socket

at

the

top

of

the

instrument.

T

u

rn

on

the

switch

at

the

left.

The

switch

is

3-position;

the

lower

detent

is

marked

“N”

for

normal

temperature

monitor-

ing,

the

middle

detent

is

“OFF’

and

the

upper

detent

is

marked

“P”

for

use

with

W

ahl

Maxi-Temp

peak

hold

cir

cuit.

This

tracks

the

temperature

and

holds

the

highest

attained

reading.

If

“L”, or “←”,

appears

or

if

there

is

no

reading,

this

indicates

the

battery

is

discharged.

For

models

MVX,

change

the

9-volt

battery.

Recharge

the

unit

by

inserting

the

recharger

in

a

110

V

AC,

50-60

Hz

wall

outlet

and

plug

in

the

recharger

jack

to

the

instrument

socket

on

the

left.

(T

urn

the

instrument

switch

OFF

during

recharging,

to

maximize

recharge

rate.

Charge

for

10-12

hours)*.

T

u

rn

on

instrument

again.

Make

measurements

with

sensor

probe

as

required.

T

u

rn

off

switch

when

measure-

ments

are

complete

to

preser

ve

battery

life.

*Special

Note

on

Care

of

Rechargeable

Batteries,

See

Paragraph

2.3

4

Figure

2-1.

Digital

Heat-Prober

Major

Features

5

2.1

Meter

Operation

The

Heat-Prober

instrument

has

an

accurate

measuring

range

as

stated

on

the

front

label.

When

the

temperature

is

below

zero,

a

minus

sign

will

automatically

show

on

digital

display.

Absence

of

a

sign

indicates

positive

temperature.

2.2

Peak

Hold

(MAXI-TEMP)

MAXI-TEMP

peak

hold

is

a

standard

feature

on

all

models.

With

the

switch

in

“P”

or

peak

hold

position,

it

will

sense

positive

increases

in

temperature

and

hold

the

highest

reading.

This

is

convenient

in

making

measurements

where

attention

to

the

probe

or

to

the

area

being

measured

occupies

the

operator.

The

peak

reading

is

held

digitally

by

the

microprocessor

and

will

not

drift.

T

o

remove

the

peak

reading,

switch

to

“OFF”,

or

to

“N”.

2.3

Batteries

(Figures

2-2)

The

Heat-Prober

is

powered

with

five

size

AA

rechargeable

nickel-cadmium

batteries,

1.25

volts

each.

The

total

capacity

is

450

milliampere

hours

at

6.0

volts.

The

LED

display

demands

the

largest

power

drain.

Depending

on

the

number

of

digits

being

displayed,

the

batteries

can

power

the

instrument

for

a

minimum

of

5

hours

or

for

as

long

as

6

hours

(with

LCD

display,

the

life

is

approximately

12

hours).

An

alternate

replaceable

9-volt

alkaline

transistor

radio-type

battery

powers

meters

with

“V”

designations

in

their

part

number.

The

instrument

has

a

voltage

regulation

which

will

accept

and

control

the

power

from

the

9-volt

battery.

These

instruments

do

not

allow

for

recharging.

Under

special

cir

cumstances

LED

models

2500M,

1370M

and

1770M

may

be

operated

with

disposable

9-volt

alkaline

batteries

with

an

approxi-

mate

3

hour

battery

Iifespan.

(Figure

2.2)

SPECIAL

NOTE:

Rechargeable

batteries

should

be

kept

at

full

charge.

On

the

shelf,

they

will

gradually

discharge,

losing

about

10%

charge

per

week.

If

the

battery

fails

to

respond

to

recharge,

provisions

have

been

made

for

ease

of

replacement.

Open

the

back

cover

and

disconnect

from

the

instrument

by

means

of

the

Molex

connector.

Replace

with

W

ahl

P/N

11681

(See

Figure

2-2).

6

Figure

2-2.

Replaceable

9V

Batter

y

Pack

Compartment

(above)

Rechargeable

Batter

y

Pack

Compartment

(below)