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TM
HX71-NB
TM
MODEL
User’s Guide
Shop online at
omega.com
e-mail: [email protected]
For latest product manuals:
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HX71 MODEL
HX71 SERIES
RH Probe/Transmitter
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TM
omega.com [email protected]
Servicing North America:
U.S.A.: Omega Engineering, Inc.
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: (203) 359-1660 Fax: (203) 359-7700
e-mail: [email protected]
For Other Locations Visit omega.com/worldwide
The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains,
and reserves the right to alter specifications without notice.
Page 3
HX71 SERIES
RH Probe/Transmitter
TABLE OF
CONTENTS
Section Page
1. General Description .................................................................. 1
2. Unpacking ................................................................................... 1
3. Theory of Operation .................................................................. 2
4. Installation and Mounting ................................................... 3-4
5. Electrical Connections .............................................................. 5
6. Wiring Examples ........................................................................ 6
7. Relative Humidity Output Calculations ................................ 6
8. RH Measured Vs Output Reading Table .............................. 7
9. Calibration and Maintenance .................................................. 8
10. Specifications .............................................................................. 9
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FIGURES
HX71 SERIES
RH Probe/Transmitter
Figure Page
Figure 1 Basic Transmitter Set-up
With Current Loop Output ............................................ 2
Figure 2 HX71 Dimensions ............................................................ 3
Figure 3 HX71 Mounting ................................................................ 3
Figure 4 HX71-NB Dimensions and Mounting .......................... 4
Figure 5 Current Transmitter Wiring Example
(4-20 mA) ........................................................................... 6
Figure 6 Voltage Transmitter Wiring Example
(0-1 Vdc and 0-5 Vdc) ...................................................... 6
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1. General Description
The OMEGA® HX71 Series Relative Humidity Transmitter’s provide
a linearized and temperature compensated output signal of 4 to 20
mA, 0 to 1 Vdc or 0 to 5 Vdc depending upon the model selected. The
output signal has been calibrated and scaled 0 to 100% for Relative
Humidity. A thin film polymer capacitor senses relative humidity and is
protected by a stainless steel cap that is easily removed for cleaning. The
Nema-4 stainless steel enclosure and cable entry connection provides
weathertight protection.
2. Unpacking
Remove the packing list and verify that you have received all your
equipment. If you have any questions about the shipment, please call
our Customer Service Department at:
When you receive the shipment, inspect the container and
equipment for any signs of damage. Note any evidence of rough
handling in transit. Immediately report any damage to the shipping
agent.
General Description
NOTE
1
The carrier will not honor any damage claims unless all shipping material
is saved for inspection. After examining and removing contents, save
packing material and carton in the event reshipment is necessary.
The following items are supplied in the box with your HX71 transmitter.
• This Manual, # M-4543 (1 ea.)
• Dewpoint Card (1 ea.)
Recommended Power Supply
For HX71-MA and HX71-MA-NB, Omega Model PST-10
For HX71-V1, HX71-V2, HX71-V1-NB and HX71-V2-NB: Omega
Model FPW-15
Complimentary Instruments
®
iSeries
Panel Meters and Controllers
Recommended Accessories
Duct/Wall Mounting Kit, OMEGA® Part No.: IND-KIT (For HX71MA, HX71-V1, HX71-V2)
Transmitter Cable, OMEGA
RH Calibration Kit, OMEGA
®
Part No.: TX4-100 (100 ft)
®
Part No.: HX92-CAL
1
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3
Theory of Operation
3. Theory of Operation
A 4-20 mA loop is a series loop in which a transmitter will vary the
current flow depending on the input to the transmitter. In the HX71
Series the amount of current allowed to flow in the loop will vary
depending on the relative humidity or temperature being measured
by the sensor(s). Some advantages of a current output over a voltage
output is that the signal measured is less susceptible to electrical
noise interference and the loop can support more than one measuring
instrument as long as the maximum loop resistance is not exceeded.
A typical application utilizing a current loop will normally consist of
a power supply, the transmitter and a meter, recorder or controller
to measure the current flow. The loop resistance in the sum of the
measuring instruments and wire used. The maximum allowable loop
resistance for the HX71 to function properly is found by using the
following formula:
R
= (power supply voltage – 8 volts) ÷ 0.02 amps
max
EXAMPLE: (When using a 10 Vdc power supply).
R
resistance
max
HX71 CABLE
= (10 – 8) ÷ 0.02 amps = 800 ohms max loop
PANEL METER
BLACK WIRE
RED WIRE
SHIELD WIRE
+
50%
+
10V
POWER SUPPLY
–
–
Figure 1 - Basic Transmitter Set-up With Current Loop Output
2
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Installation and Mounting
4. Installation and Mounting
Your HX71 Series RH Probe/Transmitter needs to be installed in
applications that allow for well circulated air flow to meet the published
specifications outlined here in this manual in Section 10.
4
NOTE
OMEGA’s HX71 transmitter’s are designed for either wall or duct
mounting. A wall/duct mounting kit is available, OMEGA
No.:HX90DM-KIT.
131 (5.18)
MOUNTING GASKET
MOUNTING PLATE
MOUNTING SCREW
MOUNTING BUSHING
DIMENSIONS: mm (in)
Figure 1-3. - RH-USB Dimensions
DUCT WALL
MOUNTING
SCREW
CLAMP
Ø 16 (5/16)
®
Part
HX71
MOUNTING
NUT
HX71
Figure 3 - HX71 Mounting
3
Page 8
4
50 (1.97)
4.3 (0.17) DIA.
Installation and Mounting
19.5
(0.76)
38 (1.50)
MOUNTING HOLE
4.3 (0.17) DIA.
45.3 (1.78)
MOUNTING
HOLE
52.6 (2.07)
65 (2.56)
DIMENSIONS: mm (in)
Figure 4 - HX71-NB Dimensions and Mounting
16 (0.62) DIA.
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5. Electrical Connections
All electrical connections and wiring should be performed by a suitably
trained professional only.
Model: HX71-MA, HX71-MA-NB
(2-Wire Current Output)
Red Wire: + Power Supply
Black Wire: 4-20 mA Output
Bare Wire: Shield, Earth Ground
Model: HX71-V1, HX71-V2, HX71-V1-NB, HX71-V2-NB
(3-Wire Voltage Output)
Red Wire: + Power Supply
Black Wire: - Power/-Output
Wire: + Output
White Bare Wire: Shield, Earth Ground
Electrical Connections
CAUTION
5
CAUTION
Your HX71 Series RH Probe/Transmitter has not been designed for, nor
is it recommended for, use in medical or nuclear applications.
Your HX71 Series RH Probe/Transmitter should never be installed in or
anywhere near explosive or flammable materials.
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Page 10
HX71 CABLE
RED WIRE
SHIELD WIRE
BLACK WIRE
PANEL METER
POWER SUPPLY
+
10V
–
50%
+
–
HX71 SERIES
6
RH Probe/Transmitter
6. Wiring Examples
Current output model HX71-MA, HX71-MA-NB (4 to 20 mA)
HX71 CABLE
Figure 5 - Current Transmitter Wiring Example
BLACK WIRE
RED WIRE
SHIELD WIRE
PANEL METER
+
50%
+
10V
POWER SUPPLY
–
–
Voltage output models HX71-V1, HX71-V2, HX71-V1-NB, HX71-V2-
NB (0 to 1 Vdc or 0 to 5 Vdc)
PANEL METER
+
HX71 CABLE
WHITE WIRE
BLACK WIRE
RED WIRE
SHIELD WIRE
+
POWER SUPPLY
Figure 6 - Voltage Transmitter Wiring Example
7. Relative Humidity Output Calculations
To calculate % Relative Humidity by measuring the current or voltage
output use the following formulas.
For 4-20 mA output:
% RH = (Current measured in milliamps – 4) ÷ 0.16
EXAMPLE: (11.04 mA – 4) ÷ 0.16 = 44% RH
For 0 to 1 Vdc output:
% RH = (Voltage measured in volts x 100)
EXAMPLE: 0.44 Vdc x 100 = 44% RH
50%
24V
–
–
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RH Measured Vs Output Reading Table
8. RH Measured Vs Output Reading Table
% Relative
Humidity 4-20 mA 0-1 (0-5) Vdc
5 4.8 0.05 (.25)
10 5.6 0.10 (.50)
15 6.4 0.15 (.75)
20 7.2 0.20 (1.00)
25 8.0 0.25 (1.25)
30 8.8 0.30 (1.50)
35 9.6 0.35 (1.75)
40 10.4 0.40 (2.00)
45 11.2 0.45 (2.25)
50 12.0 0.50 (2.50)
55 12.8 0.55 (2.75)
60 13.6 0.60 (3.00)
65 14.4 0.65 (3.25)
70 15.2 0.70 (3.50)
75 16.0 0.75 (3.75)
80 16.8 0.80 (4.00)
85 17.6 0.85 (4.25)
90 18.4 0.90 (4.50)
95 19.2 0.95 (4.75)
Output
8
7
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9
Calibration and Maintenance
9. Calibration and Maintenance
Calibration
Your transmitter has been factory calibrated to meet or exceed
the specifications outlined in this manual. The economical design
of the HX71 Series does not allow for field adjustment. Contact
our Customer Service Department if you believe your unit is not
functioning correctly.
Maintenance
If your Humidity transmitter will be used in a dusty environment, the
protective sensor cover may be removed for cleaning. Unscrew the
protective cover and gently blow compressed air through the cap. A
soft brush may also be used to remove dirt particles.
If the sensor is subjected to 100% condensation, it must be dried
to obtain correct readings. There will be no permanent damage or
calibration shift to the unit.
Units should not be exposed to high concentrations of ammonia or
alcohol vapors.
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Page 13
10. Specifications
Relative Humidity
Measuring Range: 5 - 95% (non-condensing)
Accuracy:* ±4%RH @ 22°C (72ºF) from 15 to 85%
* EMC (Electro Magnetic Compatibility)
Some of these devices may be subject to an additional reading error
of up to 2% by RFI (Radio Frequency Interference) when subjected to
a field strength of 3V/m between 625MHz and 725MHz.
Repeatability: ± 1% RH
Operating
Temperature Range: -25 to 85ºC (-13 to 185ºF)
Output
Model HX71-MA,
HX71-MA-NB: 4 to 20 mA (Scaled for 0 to 100% RH)
Model HX71-V1,
HX71-V1-NB: 0 to 5 Vdc (Scaled for 0 to 100% RH)
Model HX71-V2,
HX71-V2-NB: 0 to 1 Vdc (Scaled for 0 to 100% RH)
Power
Model HX71-MA,
HX71-MA-NB: 8 – 12 Vdc @ 20mA
Model HX71-V1, HX71-V2
HX71-V1-NB, HX71-V2-NB: 8 – 24 Vdc @ 20mA
Max Loop Resistance: Ohms = (V supply – 8 V)/0.02 A
Sensor Type: Thin Film Polymer Capacitor
Enclosure Housing
Tube Version: 316 Stainless Steel, NEMA 4
Enclosure Version: Polycarbonate, NEMA 4
Electrical Connections: 2 m (6') 4-conductor shielded PVC
cable with stripped wire leads.
Dimensions: See “Mounting” Section
Weight: 200 g (7 oz)
Approvals: CE Marked
Specifications
RH;
±4.5%RH @ 22°C (72ºF) below 15 and
above 85% RH
10
9
Page 14
NOTES:
NOTES:
HX71 SERIES
RH Probe/Transmitter
10
Page 15
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’s WARRANTY adds
an additional one (1) month grace period to the normal one (1) year product warranty to
cover handling and shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone
or written request. Upon examination by OMEGA, if the unit is found to be defective, it
will be 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 WARRANTY is VOID if the unit shows evidence of having been tampered with or shows
evidence of having been 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 in which wear is not warranted, include
but are 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 the company 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The 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.
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
RETURN REQUESTS/INQUIRIES
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. Purchase Order 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.
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 2016 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
the prior written consent of OMEGA ENGINEERING, INC.
FOR NON-WARRANTY REPAIRS,
consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:
1. Purchase Order number to cover the
COST of the repair,
2. Model and serial number of theproduct, and
3. Repair instructions and/or specific problems
relative to the product.
Page 16
Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
Shop online at omega.com
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