Omega HX94 User manual
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
omega.com
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V
A
■
0MEGA
*°
comply
with
all
worldwide
safety
and
EMC/EMI
regulations
that
apply
OMEGA
is
constantly
pursuing
certification
of
its
products
to
the
European
New
Approach
Directives.
OMEGA
will
add
the
CE
mark
to
every
appropriate
device
upon
certification.
comalned
in
,his
document
is
believed
to
be
correct
but
OMEGA
Engineering
Inc
accepts
WARNINr
Th
anv
er,
H
rS
"
con,ams
'
and
reserves
the
right
to
alter
specifications
without
nobce.
WARNING.
These
products
are
not
designed
for
use
in,
and
should
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be
used
for,
patient
connected
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pH,
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Oxygen
Instruments
M2750/0497
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