Omega Hx94 User manual

Table of contents

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HX94

SS

RH

Probe

WARRANTY/DISCLAIMER

OMEGA

ENGINEERING,

INC.

warrants

this

unit

to

be

free

of

defects

in

materials

and

workmanship

for

a

period

of

13

months

from

date

of

purchase.

OMEGA

Warranty

adds

an

additional

one

(1)

month

grace

period

to

the

normal

one

(1)

year

product

warranty

to

cover

aandling

and

shipping

time.

This

ensures

that

OMEGA'S

customers

receive

maximum

aoverage

on

each

product.

f

the

unit

should

malfunction,

it

must

be

returned

to

the

factory

for

evaluation.

OMEGA'S

Customer

Service

Department

will

issue

an

Authorized

Return

(AR>

number

immediately

upon

shone

or

written

request.

Upon

examination

by

OMEGA,

if

the

unit

is

found

to

be

defective

it

will

oe

repaired

or

replaced

at

no

charge.

OMEGA'S

WARRANTY

does

not

apply

to

defects

resulting

from

any

action

of

the

purchaser,

including

but

not

limited

to

mishandling,

improper

interfacing,

operation

outside

of

design

limits,

improper

repair,

or

unauthorized

modification.

This

A/ARRANTY

is

VOID

if

the

unit

shows

evidence

of

having

been

tampered

with

or

shows

evidence

of

being

damaged

as

a

result

of

excessive

corrosion;

or

current,

heat,

moisture

or

vibration;

improper

specification;

misapplication;

misuse

or

other

operating

conditions

outside

of

OMEGA's

control.

Components

which

wear

are

not

warranted,

including

but

not

limited

to

contact

points,

fuses,

and

triacs.

OMEGA

is

pleased

to

offer

suggestions

on

the

use

of

its

various

products.

However,

OMEGA

neither

assumes

responsibility

for

any

omissions

or

errors

nor

assumes

liability

for

any

damages

that

result

from

the

use

of

its

products

in

accordance

with

information

provided

by

OMEGA,

either

verbal

or

written.

OMEGA

warrants

only

that

the

parts

manufactured

by

it

will

be

as

specified

and

free

of

defects.

OMEGA

MAKES

NO

OTHER

WARRANTIES

OR

REPRESENTATIONS

OF

ANY

KIND

WHATSOEVER,

EXPRESSED

OR

IMPLIED,

EXCEPT

THAT

OF

TITLE,

AND

ALL

IMPLIED

WARRANTIES

INCLUDING

ANY

WARRANTY

OF

MERCHANT

ABILITY

AND

FITNESS

FOR

A

PARTICULAR

PURPOSE

ARE

HEREBY

DISCLAIMED.

LIMITATION

OF

LIABILITY:

Tha

remedies

of

purchaser

set

forth

herein

are

exclusive

and

the

total

liability

of

OMEGA

with

respect

to

this

order,

whether

based

on

contract,

warranty,

negligence,

indemnification,

strict

liability

or

otherwise,

shall

not

exceed

the

purchase

price

of

the

component

upon

which

liability

is

based.

In

no

event

shall

OMEGA

be

liable

for

consequential,

incidental

or

special

damages.

CONDITIONS:

Equipment

sold

by

OMEGA

is

not

intended

to

be

used,

nor

shall

it

be

used:

(1)

as

a

"Basic

Component"

under

10

CFR

21

(NRC),

used

in

or

with

any

nuclear

installation

or

activity;

or

(2)

in

medical

applications

or

used

on

humans.

Should

any

Product(s)

be

used

in

or

with

any

nuclear

installation

or

activity,

medical

application,

used

on

humans,

or

misused

in

any

way,

OMEGA

assumes

no

responsibility

as

set

forth

in

our

basic

WARRANTY/DISCLAIMER

language,

and

additionally,

purchaser

will

indemnify

OMEGA

and

hold

OMEGA

harmless

from

any

liability

or

damage

whatsoever

arising

out

of

the

use

of

the

Product(s)

in

such

a

manner.

mmmmmmmm

RETURN

REQUESTS/INQUIRIES

mmmmammm

Direct

all

warranty

and

repair

requests/inquiries

to

the

OMEGA

Customer

Service

Department.

BEFORE

RETURNING

ANY

PRODUCT(S)

TO

OMEGA,

PURCHASER

MUST

OBTAIN

AN

AUTHORIZED

RETURN

<AR)

NUMBER

FROM

OMEGA'S

CUSTOMER

SERVICE

DEPARTMENT

(IN

ORDER

TO

AVOID

PROCESSING

DELAYS).

The

assigned

AR

number

should

then

be

marked

on

the

outside

of

the

return

package

and

on

any

correspondence.

The

purchaser

is

responsible

for

shipping

charges,

freight,

insurance

and

proper

packaging

to

prevent

breakage

in

transit.

FOR

WARRANTY

RETURNS,

please

have

the

following

information

available

BEFORE

contacting

OMEGA:

1.

P.O.

number

under

which

the

product

was

PURCHASED,

2.

Model

and

serial

number

of

the

product

under

warranty,

and

3.

Repair

instructions

and/or

specific

problems

relative

to

the

product.

FOR

NPN-WARB

AN

TY

REPAIRS,

consult

OMEGA

for

current

repair

charges.

Have

the

following

information

available

BEFORE

contacting

OMEGA:

1.

P.O.

number

to

cover

the

COST

of

the

repair,

2.

Model

and

serial

number

of

product,

and

3.

Repair

instructions

and/or

specific

problems

relative

to

the

product.

OMEGA'S

policy

is

to

make

running

changes,

not

model

changes,

whenever

an

improvement

is

possible.

This

affords

our

customers

the

latest

in

technology

and

engineering.

OMEGA

is

a

registered

trademark

of

OMEGA

ENGINEERING,

INC.

©

Copyright

1996

OMEGA

ENGINEERING,

INC.

All

rights

reserved.

This

document

may

not

be

copied,

photocopied,

reproduced,

translated,

or

reduced

to

any

electronic

medium

or

machine-readable

form,

in

whole

or

in

part,

without

prior

written

consent

of

OMEGA

ENGINEERING,

INC.

OMEGA

ENGINEERING,

INC.

j\n

OMEGA

Technologies

Company

HX94

RELATIVE

HUMIOITY/TEMPERATURE

PROBE

transmitter

A.

GENERAL

DESCRIPTION

The

stainless

steel

probe

provides

temperature

compensated

relative

humidity

as

well

as

temperature

outputs.

A

thin

film

polymer

capacitor

senses

relative

humidity,

while

temperature

is

monitored

by

a

100

ohm

platinum

RTD.

The

sensors

are

protected

by

a

stainless

steel

filter

cap

that

is

easily

removable

for

cleaning.

The

sealed

probe

has

an

end

cap

that

may

be

removed

for

access

to

calibration

trimmers

when

neces¬

sary.

Signal

and

power

connections

are

made

via

a

4

pin

connector

at

the

end

of

a

12”

cable.

An

adjustable,

removable

duct

flange,

allows

mounting

at

any

depth

between

1

and

9

inches.

Also

provided

is

a

mating

cable

connector

and

a

clip

for

wall

mounting.

The

current

output

version

of

the

probe

is

a

true

2-wire

transmitter

with

an

unusually

low

compliance

voltage

(6

volts),

allowing

for

long

wire

runs.

The

voltage

version

has

internal

voltage

regulation

so

that

any

low

power

source

(3.5ma)

over

a

wide

voltage

range

(6

to

30

volts)

will

operate

the

unit.

Both

current

and

voltage

versions

are

polarity

protected.

B.

UNPACKING

Verify

that

the

following

parts

have

been

received.

1.

Probe

transmitter

2.

2-piece

duct

flange,

with

o-ring,

(3)

flat

head

screws,

and

gasket

3.

4-pin

mating

connector

4.

Wall

mounting

clip

and

screw

5.

Instruction

manual

3

C.

THEORY

OF

OPERATION

A

4

to

20

milliamp

loop

is

a

series

current

loop

in

which

a

transmitter

will

vary

the

current

flow

depending

upon

the

parameter

being

measured

(Relative

Humidity

or

Temperature).

Advantages

of

a

current

output

over

a

voltage

output

is

that

is

less

susceptible

to

noise

interference

and

allows

the

connection

of

more

than

one

meter

or

recorder

to

the

loop

as

long

as

the

maximum

resistance

is

not

exceeded.

The

typical

current

loop

will

consist

of

a

power

supply,

transmitter,

and

a

meter

to

measure

the

current

flow.

The

loop

resistance

is

the

sum

of

the

impedance

of

the

meter(s)

and

the

lead

wire.

The

maximum

allflMbla

IdPp

impedance

of

the

probe

is

found

by

the

Formula:

Rmax

=

(power

supply

voltage-6

volts)/.02

amps

Example:

when

using

a

24VDC

power

supply:

Rmax

=

(24-6)

/

.02

=

900

ohms

(for

total

wire

length

to

and

from

the

transmitter).

The

following

chart

shows

various

resistance

of

lead

wire:

AWG

WIRE

SIZE

RESISTANCE

PER

1000

FEET

24

25

ohms

22

15

ohms

20

10

ohms

18

6

ohms

16

4

ohms

If

the

meter

or

recorder

being

used

accepts

only

voltage,

than

either

the

voltage

version

of

the

probe

(O

to

1

volt)

should

be

used,

or

convert

the

current

to

voltage

by

installing

a

250

ohm

resistor

across

the

input

terminals

of

the

recorder

to

obtain

a

1

to

5

volts

input.

4

D.

TERMINAL

CONNECTIONS

MATING

USER'S

CONNECTOR

PHILLIPS

1.

Remove

small

Phillips

head

screw

from

mating

connector.

2.

Pull

out

pin

section

from

front.

3.

Insert

cable

end

thru

connector

before

soldering

to

solder-cup

pins.

4.

The

terminals

will

accept

No.

26

to

18

AWG

wires

HX94C

HX94V

PROBE

CABLE

CONNECTOR

CURRENT

VOLTAGE

WIRE

COLOR

PIN

NO.

DESIGNATIONS

DESIGNATIONS

BLACK

1

+V

TEMPERATURE

+V

POWER

SUPPLY

WHITE

2

+VRH

-V

GROUND

RED

3

-V

TEMPERATURE

VT

TEMP.

OUTPUT

GREEN

4

-VRH

VRHRH

OUTPUT

E.

WIRING

EXAMPLES

1.

TYPICAL

CURRENT

HOOKUP

*

Wires

R1

and

R2

can

be

combined

into

one

single

wire

with

a

jumper

at

pins

(1)

and

(2).

This

will

mean

3

wires

instead

of

4.

HX94C

(3)

FLAT

HEAD

SCREWS

DUCT

FLANGE

F.

MOUNTING

GASKET

A.

DUCT

MOUNTING

DUCT

WALL-*-

U

STEPS

1.

Slide

flange

holder

onto

probe

with

countersink

hole

facing

front

of

probe

as

shown.

2.

Position

o-ring

on

probe

at

desired

position,

(for

depth

into

duct).

3.

Slide

duct

flange

onto

probe

with

countersink

of

screw

holes

facing

front

of

probe

as

shown.

4.

Fasten

with

(3)

6/32

flat

head

screws

and

tighten

evenly

until

secure.

5.

Position

gasket

between

duct

flange

and

duct

wall

and

fasten

assembly

to

duct

with

(4)

#6

sheet

metal

screws

(not

included).

The

duct

wall

requires

a

13/16“d.

(.812"

or

21

mm)

hole

for

probe,

with

(4)

mounting

holes

(for

#6

sheet

metal

screws)

evenly

spaced

on

a

2.0”

(51

mm)

circle.

Use

duct

flange

as

template.

B.

WALL

MOUNTING

1.

Fasten

plastic

clip

to

wall

with

included

screw.

2.

Snap

probe

into

clip.

6

G.

RH

AND

TEMPERATURE

CALCULATIONS

1.

Max

current

loop

impedance

for

RH

or

Temperature

Rmax

=

(V

supply-6

volts

)/.02

amps

2.

RH

current

output:

(i

=

current

output

in

milliamperes)

%RH

=

(i

—4)/.16

'RH

=

(%RH)

x

(.16)

+

4

3.

Temperature

current

output

°C

=

(i

-4)

x

(100/16)

'C

=

(°C)

x

(16/100)

+

4

°F

=

(i

-4)

x

(180/16)

+

32

'F=

(°F-32)

x

(16/180)

+

4

4.

RH

voltage

output:

(V

=

voltage

outage

in

millivolts)

%RH

=

V/10

5.

Temperature

voltage

output

°C

=

V/10

°F

=

(V/10)

x

(1.8)

+

32

V

R

H

=

(%RH)

x

(10)

V

C

=

(°C)

x

(10)

V

F

=

(°F-32)

x

(10/1.8)

7

H.

RH

CALIBRATION

1.

Unscrewing

cable

endcap

will

expose

two

trimpots,

S

(SPAN)

on

the

left,

and

Z

(ZERO)

on

the

right.

2.

Place

sensor

end

of

probe

in

“low”

RH

environment

(e.g.

Lithium

chloride

solution,

11.3%RH)

3.

Adjust

trimpot

Z

so

that

output

decreases

to

a

minimum

value

and

further

adjustment

produces

no

change.

Output

will

be

approximately

4ma

for

current

version

(

(O

volts

for

voltage

version).

4.

Adjust

trimpot

Z

until

output

just

starts

to

increase

from

4ma

(0

volts)

5.

Place

sensor

end

of

probe

in

“high”

RH

environment

(e.g.

Sodium

Chloride

solution,

75.3%RH).

6.

Adjust

trimpot

S

until

output

reading

is

equivalent

to

the

difference

between

the

“low”

and

“high”

RH

environments.

Example:

75.3%

RH-11.3%RH

=

64%RH,

which

is

equivalent

to

14.24

miiliamperes

(640

millivolts

for

voltage

version).

(See

calculation

section

formulas.)

7.

Adjust

trimpot

Z

until

output

reading

is

equivalent

to

the

“high”

RH

environment

(e.g.

75.3%RH

is

16.05

miiliamperes

(753

millivolts)

as

determined

by

formulas).

8

I.

TEMPERATURE

CALIBRATION

Temperature

is

factory

calibrated

only,

and

does

not

require

any

further

calibrations.

J.

MAINTENANCE

If

the

probe

is

operated

in

a

dusty

environment,

the

protective

sensor

filter,

if

clogged,

may

be

removed

for

cleaning.

Unscrew

filter

and

gently

blow

compressed

air

through

screen.

If

necessary,

use

a

soft

brush

to

remove

lint

from

sensors.

If

the

sensors

are

subjected

to

100%

condensation,

they

must

be

dried

to

obtain

correct

readings.

There

is

no

permanent

calibration

shift,

nor

is

recalibration

necessary

if

100%

condensation

occurs.

The

instrument

should

not

be

exposed

to

high

concentrations

of

ammonia

or

alcohol

vapors.

However,

any

environment

that

is

breathable

under

normal

HVAC

applications

should

not

affect

the

sensors.

To

maintain

original

specifications,

it

is

generally

recommended

that

the

RH

sensor

be

recalibrated

on

an

annual

basis

depending

upon

operating

conditions.

The

temperature

sensor

does

not

require

recalibration.

9

K.

SPECIFICATIONS

1.

RELATIVE

HUMIDITY:

Thin

film

polymer

capacitor

INPUT

VOLTAGE

RANGE:

6

to

30VDC

(Polarity

protected)

RANGE/ACCURACY/REPEATABILITY:

3%RH

to

95%RH/

±2%RH/±1%RH

TEMPERATURE

COMPENSATION:

-20°C

to

85°C

CURRENT

OUTPUT:

4

to

20ma

for

0

to

100%RH

VOLTAGE

OUTPUT:

0

to

1.0

volt

for

0

to

100%RH

TIME

CONSTANT:

(for

90%

responses

at

25°C;

in

moving

air,

IM/sec)

Less

than

20

seconds,

10%RH

to

90%RH

Less

than

30

seconds,

90%RH

to

10%RH

2.

TEMPERATURE:

Thin

film

100

ohm

platinum

RTD

(DIN

43760)

INPUT

VOLTAGE

RANGE:

6

to

30VDC

(polarity

protected).

RANGE:

0°C

TO

100°C

(32°F

TO

212°F)

ACCURACV/REPEATABILITV:

±fl.6°£

(±1°F)/±o.3°c

(±o.

5

°f)

CURRENT

OUTPUT:

4

to

20ma

for

0°C

to

100°C

VOLTAGE

OUTPUT:

O

to

1.0

volt

for

0°C

to

100°C

TIME

CONSTANT:

(for

60%

response)

less

than

2

seconds

in

moving

air

(IM/sec);

less

than

10

seconds

in

still

air.

3.

M

ECHANICAL

HOUSING:

Stainless

steel

water

tight

enclosure

meets

NEMA

4

specifications.

DIMENSIONS:

PROBE;

10.00"

(254mm

long),

.75"

(19mm)

diameter,

12"

cable.

DUCT

FLANGE;

variable

1

“

to

9"

(25.4

to

227mm)

depth.

2.75"

(70mm)

diameter,

duct

hole

.812"

(21mm)

diameter,

with

4

mounting

holes

.156"

(4mm)

diameter

(for

#6

sheet

metal

screws)

on

2.00"

(51mm)

circle.

CONNECTIONS:

4

pin

mating

connector

accepts

26

to

18

AWG

wires.

WEIGHT:

7

ounces

(198

grams)

with

duct

flange.

CE

Approved

10