Omega Products HX94AC User Manual

Relative Humidity/Temperature
Transmitters

For Duct or Wall Mounting

HX94ACW

$

245

†

ptional

O

⻬ Accurate to ±2.5%

Relative Humidity
and ±0.6°C (±1°F)
Temperature

⻬ Provides Independent

Analog Outputs for Both
Humidity and Temperature
Measurement

⻬ Stainless Steel

NEMA 4 (IP66) Housing

⻬ 3 Different Output

Connection Styles
Available

⻬ Models with 4 to 20 mA or

0 to 1 Vdc Outputs

⻬ Removable Stainless Steel

Sensor Filter

⻬ Includes Hardware for

Wall and Duct Mounting

⻬ Standard Models Include

Cable and Connector Pair

†

Refer to ordering chart on next page for

NIST calibration ordering information.

HX94AC, $275, shown much
smaller than actual size.

Connector pair included with
models HX94AC and HX94AV only.

The HX94A relative humidity/
temperature transmitter provides
a reliable and low cost method for
duct or wall mount monitoring
applications. Solid state sensors
provide excellent sensitivity, fast
response, and stability.

All models include mounting kit,
shown above.

Simple hookup and linearized
output permit interfacing with most
display and control devices like
meters, controllers, recorders, and
data loggers. The design features
a rugged stainless steel NEMA 4
(IP66) housing.

MODELS AVAILABLE WITH THREE DIFFERENT CONNECTION STYLES SHOWN BELOW!

Standard connector model. “W” and “NPT” models

come with stripped leads.

Hu-21

NPT fitting model

with stripped leads.

1.0 m
(3.0')

CABLE

4-PIN

CONNECTOR

1

9 (0.75) dia.

25.4 to 227
(1 to 9)

VARIABLE
DEPTH
FLANGE

R

EMOVABLE

S

TAINLESS STEEL

F

ILTER CAP

254 (10.0)

Dimensions:

4

3

2

1

+

*R2

*

R1

PROBE

C

ONNECTOR

*R1 and R2 CAN 
COMBINE IN 
ONE WIRE PLUS 
J

UMPER PINS 1 AND 2

T

EMP. 

M

ETER
OR
RECORDER

R

H METER 
OR 
R

ECORDER

6-30 VDC
POWER
S

UPPLY

R LOAD R LOAD

MAX R LINES = (V SUPPLY-6)/0.02
F

or 1 to 5 Volt Output, R Load = 250 Ohm

-

+

-

+

-

4

3

2

1







+

PROBE

C

ONNECTOR

TEMP. 
M

ETER

O

R

RECORDER

RH METER 
OR 
R

ECORDER

6

-30 Vdc
POWER
S

UPPLY

-

+

-

+

-

mm (in)

Specifications

Relative Humidity

hin-film polymer capacitor

T

ower: 6 to 24 Vdc (polarity protected)

P
Measurement Range: 3 to 95% RH
Accuracy: ±2.5% @ 22°C (72ºF) from

20 to 80% RH; ±3.1% @ 22°C (72ºF)
below 20 and above 80% RH; with an
added temperature coefficient error of
±0.1% RH/°F (both increasing and
decreasing in temperature)

Repeatability: ±1% RH
Temperature Compensation:

-20 to 85°C (-4 to 185°F)

Current Output:

Voltage Output:

Time Constant: (for 90% response at

25°C; in moving air, 1m/sec)

Temperature

Thin-film 100 Ω Platinum RTD
(DIN 43760)

Input Voltage Range:

6 to 24 Vdc (polarity protected)

Range: 0 to 100°C (32 to 212°F)
Accuracy: ±0.6°C (±1°F)
Repeatability: ±0.3°C (±0.5°F)
Current Output:

Voltage Output:

Time Constant: (for 60% response)

Less than 2 seconds in moving air
(1m/sec), less than 10 seconds in still air

Mechanical

Housing: 316 SS NEMA 4

(IP66) enclosure
Probe: 254 x 19 mm dia. (10 x 0.75"),
305 mm (12") cable
Duct Flange: Removable, variable

25.4 to 227 mm (1 to 9") depth. 70 mm
(2.75") dia., duct hole 21 mm (0.812")
dia. 4 mtg holes 4 mm (0.156") dia.
(for #6 sheet metal screws) on 51 mm
(2.00") dia. circle; wall mounting
bracket included

Connections:

Weight: 198 g (7 oz) with duct flange

HX94AC: 4 to 20 mA (0 to 100% RH)

HX94AV: 0 to 1.0 V (0 to 100% RH)

Less than 20 Seconds: 10 to 90% RH
Less than 30 Seconds: 90 to 10% RH

HX94AC: 4 to 20 mA for 0 to 100°C

HX94AV: 0 to 1.0 V for 0 to 100°C

HX94AC/94AV: 4 pin mating

connector accepts 26 to 18 AWG wires
HX94ACW/94AVW: 1 m (3') braided
and shielded cable, PVC sheathing

HX94ACNPT/94AVNPT:

conductor with 1 m (3') braided and
shielded cable

1

⁄2" male NPT

Voltage Connector Models

Current Connector Models

Lead Wire Models

Models: HX94ACW, HX94ACNPT
(2-Wire Current Output with
stripped leads)
Relative Humidity:

White Wire: + Power supply
Green Wire: 4 to 20 mA output
Bare Wire: Shield, earth ground

Temperature:

Black Wire: + Power supply
Red Wire: 4 to 20 mA output

Models: HX94AVW, HX94AVNPT
(3-Wire Voltage Output with
stripped leads)
Relative Humidity:

Black Wire: + Power supply
Green Wire: 0 to 1 Vdc putput
White Wire: - Power supply
Bare Wire: Shield, earth ground

Temperature:

Black Wire: + Power supply
Red Wire: 0 to 1 Vdc output
White Wire: - Power supply

MOST POPULAR MODELS HIGHLIGHTED!

To Order (Specify Model Number)

Model No. Price Description
HX94AC $275 RH/temp transmitter with 4 to 20 mA outputs with

HX94AV 275 RH/temp transmitter with 0 to 1 Vdc outputs with

HX94ACW 245 RH/temp transmitter with 4 to 20 mA outputs with

HX94AVW 245 RH/temp transmitter with 0 to 1 Vdc outputs with

HX94ACNPT 255 RH/temp transmitter with 4 to 20 mA outputs with

HX94AVNPT 255 RH/temp transmitter with 0 to 1 Vdc outputs with

HX94-MC 10 Spare 4-pin mating connector
PSR-24S 60

PSR-24L 60

PSR-24L-230 60

TX4-100 35 4 conductor shielded transmitter cable, 30 m (100')
CAL-3-HU

Comes complete with mating connector (models HX94AC and HX94AV only), removable

†

protective sensor filter, removable duct flange, wall mounting bracket, and operator’s manual.
Ordering Example: HX94AC, duct mount RH/temperature transmitter with 4 to 20 mA output, $275.

Hu-22

4-pin connector

4-pin connector

1 m (3') lead wires

1 m (3') lead wires

1

⁄2" male NPT fitting and 1 m (3') leads

1

⁄2" male NPT fitting and 1 m (3') leads

Regulated power supply, US plug, 90 to 264 Vac input,
24 Vdc output, 400 mA, screw terminals, UL

Regulated power supply, US plug, 90 to 264 Vac input,
24 Vdc output, 400 mA, stripped leads, UL

Regulated power supply, European plug, 230 Vac input,
24 Vdc output, 400 mA, stripped leads, CE

125 NIST-traceable calibration

H

u