Omega Products HX98-2 User Manual

Mounting
holes (2)

4.32
(0.17) dia.

63.50
(2.50)

31.75
(1.25)

127

(5.00)

83.82
(3.30)

16.76
(0.66)

Saturated Environment
Relative Humidity Transmitter

 Waterproof Sensing Element and Housing
 Compact Transmitter with Built-in Sensor
 Bulk Polymer Resistance RH Sensor
 RTD Temperature Measurement Sensor
 Temperature Compensation
 Resistant to Contamination

Applications

 Greenhouses
 Textile Mills
 Food Processing
 Shipping Containers
 Swimming Pools

OMEGA’s relative humidity transmitter
is a waterproof RH sensing element
and package which is ideally suited
for monitoring relative humidity and
temperature in high RH/harsh
environment applications or where
washdowns are required. The unit is
designed for continuous monitoring
of relative humidity and temperature
with ±2% RH accuracy.

Both the sensor and electronics are
contained in an epoxy-hardened
enclosure designed for continuous
service. A water-tight membrane filter
is installed over the RH sensor for
increased protection against high RH,
contaminants and washdowns. The unit
is designed to withstand 100% saturation.

The sensor incorporates a bulk
polymer resistance element. The
polymer is impervious to most
contaminants and, since it is a
bulk resistance device, surface
contaminants such as dust will not
alter the accuracy of the readings.

The unit is provided with continuous
temperature compensation which
adjusts for temperature-induced
change in the RH sensor output.
The compensation provides high
measurement accuracy over the entire
operating range of the instrument.

Dimensions:

mm (in)

Specifications

Humidity Sensing Element: Resistance

change of bulk polymer sensor

Temperature Sensing Element:

100 Pt RTD

Performance

Accuracy: @ 25°C (77°F) ±2% RH

(30 to 95% RH including hysteresis,
linearity and repeatability); ±0.5°C
Temperature Effect: Less than

0.11% per °C (0.06% per °F)

Sensitivity: 0.1% RH
Repeatability: 0.5% RH
Linearity: See accuracy
Hysteresis: Less than 1%

Operating Range

Sensor Electronics: 0 to 100% RH,

-20 to 54°C (-4 to 129°F)

Max Air Velocity: 10,000 ft/min
Output Ranges: 2-wire, loop-powered;

4 to 20 mA for 0 to 100% RH into
0 to 900 Ω; 4 to 20 mA for -28.9 to 60°C
(-20 to 140°F)

Adjustment

Zero: ±20%, non-interactive
Span: ±10%, non-interactive
Long-Term Stability: Less than 2%

drift per year typical

Power

Supply Voltage: 12 to 36 Vdc
Max Load: Ω = supply -10 Vdc x 50 A

Note: Minimum supply voltage of
15 Vdc is required for 10V output units

To Order (Specify Model Number)

Model No. Price Description
HX98-1 $470 RH/temperature transmitter (front wiring)
HX98-2 470 RH/temperature transmitter (rear wiring)
HX98-CASE 91 304 SS case, 16.78 (0.66") thick
HX98-MC 10 Spare mating connector
PSR-24S 60
PSR-24L 60
PSR-24L-230 60 Regulated power supply, 24 Vdc, 400 mA, stripped

PSU-93 40 Unregulated power supply, 16 to 23 Vdc, 300 mA max,

Comes complete with waterproof mating connector and operator’s manual.

To order 3-point NIST-calibration add suffix “-NIST” to model number and add $189 to price.

*

Ordering Example: HX98-1-NIST, RH/TEMP transmitter (front wiring), with HX98-MC, spare
mating connector and NIST traceable calibration, $470 + 189 + 10 = $669.

Recommended Reference Book: Standard Handbook for Civil Engineers,

HX98-1

$

470

ptional*

O

HX98-1, $470,
shown smaller
than actual size.

Wiring Connection:

Deutsch 4-position waterproof connector
(mating connector provided)
(For front wiring only; flying leads for
back wiring)

Storage Temperature:

-65 to 70°C (-85 to 158°F)
Optional Case: 304 SS (HX98-CASE),
protects face from mechanical damage

MOST POPULAR MODEL HIGHLIGHTED!

Regulated power supply, 24 Vdc, 400 mA, screw terminal
Regulated power supply, 24 Vdc, 400 mA, UL stripped leads

leads, 230 Vac input, CE

screw terminal

CE-1201, $158. See Section Y for Additional Books.

Hu-27

Waterproof
mating
connector
included.

One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | [e-mail]

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