Omega Products HX71-MA User Manual

Economical RH
Sensor/Transmitter

For Wall or Duct Mounting

HX71 Series

†

Optional

U 316 SS Housing or

ABS Plastic Watertight
Enclosure

U Accurate to ±3.5% RH

@ 23°C

U 3 Different Output Models:

4 to 20 mA, 0 to 1 Vdc
or 0 to 5 Vdc

U Removable Stainless

Steel Sensor Cap

U Ideal for Wall or

Duct Mounting

The HX71 Series relative humidity
sensor/transmitter provides a
reliable and economical method for
most relative humidity monitoring
applications. The compact design is
ideal for wall or duct mounting. Each
unit is factory calibrated to provide
excellent sensitivity, fast response,
and stability. The unit features a
simple installation and hookup. The
linearized current or voltage output
permits interfacing with most display
and control devices like meters,
controllers, recorders, and data
loggers. The design features a
316 SS NEMA 4 (IP66) housing and
includes a shielded output cable
with stripped wire leads. A mounting
kit is available that allows for wall or
duct mounting.

HX70-MKIT wall/duct mounting kit,

shown smaller than

actual size.

Specifications

Accuracy RH:

±3.5% RH from 15 to 85% RH@23°C
±4% RH below 15 and above 85%
RH@23°C

Input Voltage Range:

HX71-MA: 8 to 12 Vdc (polarity protected)

HX71-V1, HX71-V2: 8 to 24 Vdc

(polarity protected)

Output:
HX71-MA: 4 to 20 mA for 0 to 100% RH
HX71-V1: 0 to 5 Vdc for 0 to 100% RH
HX71-V2: 0 to 1 Vdc for 0 to 100% RH
RH Temperature Compensation:

-25 to 85°C (-13 to 185°F)

Repeatability: ±1% RH
Housing: 316 stainless steel
Connections: 2 m (6') shielded cable,

stripped leads, PVC sheath
Dimensions:

Stainless Steel Tube Model:
130 L x 16 mm D (5.125 x 0.625")

ABS Enclosure Model:

49.8 L x 64.8 W x 34.8 mm D

(1.96 x 2.55 x 1.37")

Removable

sensor

filter.

To Order Visit omega.com/hx71 for Pricing and Details

Model No. Description
HX71-MA RH sensor/transmitter with 4 to 20 mA output
HX71-V1 RH sensor/transmitter with 0 to 5 Vdc output
HX71-V2 RH sensor/transmitter with 0 to 1 Vdc output

For ABS Enclosure Models add “-NB” to the model number, no additional charge.

Accessories

Model No. Description
HX70-MKIT Wall/duct mounting kit

PSR-12L Regulated power supply, US plug, 100 to 250 Vac input,

12 Vdc output, 1.2A, stripped leads

PSR-24S Regulated power supply, US plug, 90 to 264 Vac input,

24 Vdc output, 400 mA, screw terminals (not recommended
for HX71-MA)

TX4-100 4-conductor shielded transmitter cable, 30 m (100')
CAL-3-HU† NIST traceable calibration with 3 data points

Comes complete with an integral shielded cable with striped wire leads, removable protective
sensor cap and operator’s manual.

Ordering Examples: HX71-MA, RH sensor/transmitter with 4 to 20 mA output.
HX70-MKIT wall/duct mounting kit, and PSR-12L regulated power supply.

HX71-V1, RH sensor/transmitter with 0 to 5 Vdc output, HX70-MKIT wall/duct mounting kit,
PSR-24S regulated power supply, and TX4-100 4-conductor shielded transmitter cable.

HX71-MA-NB, RH sensor/transmitter with 4 to 20 mA output and ABS Enclosure.

Exclusively

from OMEGA!

HX71-MA

shown actual size.

Weight:

Stainless Steel Tube Model:
67 g (0.18 lb)

Enclosure Model: 82 g (2.9 oz)

HX71-MA-NB
shown smaller than
actual size.

Hu-15