Omega | HX801 & HX802 | Owner Manual | HX801 & HX802

HX801 & HX802
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M3475/0302
HX801 & HX802 SERIES
HUMIDITY & TEMPERATURE TRANSMITTER
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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly
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device upon certification.
The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for any errors it
contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected applications.
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 handling and shipping time. This ensures that
OMEGA’s customers receive maximum coverage on each product.
If 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 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
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RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
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FOR WARRANTY RETURNS, please have the
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1. P.O. number under which the product was PUR
CHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific problems
relative to the product.
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have the
following information available BEFORE con
tacting 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
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OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers
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 Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced,
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OMEGA ENGINEERING, INC.
The Proper Installation & Maintenance .
MOUNTING.
(1)
Mount in a clean environment.
(2)
Do not subject to vibration.
(3)
Avoid mounting near power control equipment.
(4)
Mount the HX802 on a solid wall or panel, where air will flow freely around it.
(5)
Mount the HX801 through a HX801-FLG 100mm flange, into the duct.
(6)
Always mount the transmitter so that the protective cap is either horizontal or sloping downwards. This helps
prevent condensate build up in high humidity situations.
(7)
Avoid mounting where the protective cap will get wet as this may cause false readings.
(8)
Again ensure there is adequate air flow over the sensor.
(9)
To maintain compliance with the EMC Directives, the metal enclosure must be properly earthed, with
appropriate input / output entry points, cabling and filtering.
WIRING.
(1)
All cables should be good quality overall screened INSTRUMENTATION CABLE with the screen earthed at one
end only.
(2)
Signal cables should be laid a minimum distance of 300mm from any power cables.
(3)
For the two, 2 wire current loops Austral Standard Cables B5002CS is recommended.
(4)
It is recommended that you do not ground current loops and use power supplies with ungrounded outputs.
(5)
Lightning arrestors should be used when there is a danger from this source.
(6)
Refer to diagrams for connection information.
TEMP
%RH
HX801 & HX802 Humidity
and Temperature
Transmitters
Features.
l
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l
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l
Dual 4~20mA Outputs.
Monolithic IC Humidity Sensor.
%RH Temperature Compensated Linear Output.
Pt100 RTD Sensor.
Temperature Output 0~100C. (0~200F Optional)
Temperature Output Linearised.
HX801-FLG
Very Compact Design.
High Accuracy.
Low Cost.
Easy to Install.
Reverse Polarity Protection.
Internally Accessible Span & Zero Adjustments.
Wide Power Supply Range.
HX801
4~20mA HUMIDITY
4~20mA TEMPERATURE
HX802
Description.
COMMISSIONING.
(1)
Once all the above conditions have been carried out and the wiring checked apply power to the loops and
allow five minutes for them to stabilize.
(2)
To check humidity accuracy use a calibration standard %RH device in the same location. Check that the readings
agree within 2% + % error of the calibration device. Alternatively expose the transmitter to a known %RH
atmosphere, and check the readings agree within 2% + % error of atmosphere.
All readings should be referenced against the ASTM Relative Humidity tables, and allowances made for pressure
effects if necessary. Any differences can be corrected using the Humidity Zero and Span trimpots .
(Clockwise to increase the output reading, and anticlockwise to decrease the output readings.)
(3)
To check temperature accuracy use a calibration standard RTD in the same location. Check that the readings
agree within 0.1% of the calibration device. Any differences can be corrected using the Temperature Zero and
Span trimpots . (Clockwise to increase the output reading, and anticlockwise to decrease the output
readings.)
The HX801 & HX802 is a complete relative humidity and temperature sensing module, with two independant loop powered
4~20mA output signals, representing 0~100%RH and 0~100C.
Two versions are available:
(i) Wall mount.
(ii) Duct mount.
Both version come complete in an industry standard aluminium connection head. The relative humidity sensor and
temperature compensating sensor protrude from the head inside a protective cap. This cap allows air to circulate to the
sensors.
Reliability.
The wide operating range of the humidity and temperature sensors offer long term reliability over a broad range of
applications. The sensors resist contaminating vapours such as organic solvents, chlorine, and ammonia.
MAINTENANCE.
(1)
Repeat 2 and 3 of Commissioning - breathing on the protective cap will cause the %RH and Temperature readings
to alter.
(2)
Do it regularly - at least once every 6 months.
(3)
Check cables entering the head.
CLEANING OR REPLACING THE PROTECTIVE CAP.
If the protective cap becomes dirty it can easily be removed for cleaning, or replaced, as follows:
(1)
Disconnect power.
(2)
Carefully unscrew the cap by hand. No tools to be used - they may damage the protective cap.
(3)
The cap may now be cleaned or replaced.
(4)
Ensure the cap is thoroughly dry before replacing.
(5)
Carefully screw the cap back on by hand, and reapply the power.
NOTE: Do not be operated without the protective cap, as the humidity sensor reading is affected by light.
Quality Assurance Programme.
The modern technology and strict procedures of the ISO9001 Quality Assurance Programme applied during design,
development, production and final inspection grant the long term reliability of the instrument.
Terminals and Layout.
RH Transmitter Specifications.
Accurate to
<±2% FSO Typical. 0~100%RH @ 25C Saturated Salt Calibration.
For continuous measurements of ≥95%RH, refer to note 4 below.
<±0.05%/C FSO Typical.
-Hysteresis
±0.8% of Span Typical.
-Linearity
±0.5%RH Typical.
-Repeatability ±0.5%RH Typical.
-Long Term Drift ±1%RH Typical at 50%RH in 5 years.
Important:
Ambient Temperature Drift
Humidity Sensor
TEMPERATURE SPAN ADJUSTMENT
TS
TEMPERATURE ZERO ADJUSTMENT
TZ
+
%RH
LPN-H
T EMP
<±0.1% FSO Typical.
<±0.1% FSO Typical.
<±0.02%/C FSO Typical.
Pt100 RTD, Class A Din 43760.
0.5mA.
+
Accurate to
Linearity and Repeatability
Ambient Temperature Drift
RTD Sensor
Sensor Current
-
SENSORS CONNECTOR
(2x5 HEADER)
Temperature Transmitter Specifications.
HS
HUMIDITY SPAN ADJUSTMENT
-
Common Specifications.
HUMIDITY ZERO ADJUSTMENT
Output.
2 wire 4~20mA (Loop Powered).
Power Supply.
9~40Vdc.
Supply Voltage Sensitivity.
<±0.01%/V FSO.
Maximum Output Current.
Limited to <36mA.
Output Load Resistance.
750Ω @ 24Vdc. (50Ω/V Above 9Vdc).
R.F. Immunity.
<1% Effect FSO Typical.
Isolation Between %RH and Temperature 50Vac/dc Max.
Operating Temperature. -at headA)
0~70C.
-30~85C (LPN-H-D)
-at sensorB)
Storage Temperature.
-30~85C.
Operating Humidity.
-at headA)
90%RH Max. Non-condensing.
-at sensorB)
0~100%RH. Refer note 4 below.
Note 1.
Note 2.
Note 3.
Note 4.
Graph Of Maximum Load Versus Power Supply.
1550
1350
Maximum Load (Ω)
Note:
HZ
A)
'at head' refers to ratings for electronics housed in the connection head.
B)
'at sensor' refers to ratings for electronics housed in the protective cap.
Good airflow and good air mixing must be maintained over the sensor to minimise local temperature fluctuations, and to ensure accurate measurements.
Specifications based on Standard Calibration Unit, unless otherwise specified.
Due to ongoing research and development designs, specifications, and documentation are subject to change without notification.
No liability will be accepted for errors, omissions or amendments to this specification.
The RH sensors quickly recover from condensation or wetting with no shift in calibration. However, after 24 hours or longer exposures to
either high >95%RH or continuous condensation, an upward shift of 2% to 3%RH may occur. This shift is repeatable and can be reversed
by placing the sensor in a low 10%RH environment for a 10 hour period.
CONDENSATION occurs whenever the surface temperature of the sensor's active area drops below the ambient dew point of the
surrounding gas. Condensation forms on the sensor (or any surface) even if the surface temperature only momentarily drops below the
ambient dew point. Small temperature fluctuations near the sensor can unknowingly cause condensation to form when operating at humidity
levels above 95%.
While quick to condense, water is slow to evaporate in high humidity conditions. (ie when the surface temperature of the sensor is only
slightly above the ambient dew point.) Because of this, a sensor's recovery from either condensation or wetting is much longer than its
normal time response. During recovery, the sensor outputs a constant 100%RH signal, regardless of the ambient RH.
HX802 Dimensions.
1150
950
750
550
350
150
0
9
12
16
20
24
28
32
36
40
Power Supply (Vdc)
HX801-FLG Dimensions.
Connection Example.
=8mm
9~40Vdc
Power Supply
Typical 24Vdc
Allow 40mA per Signal.
44mm
24mm
Grub Screw
M6 x 8
100
24 40
90
Mitre for
O-ring
69mm
+
50mm Nom.
-
170mm
4 x 6mm
countersunk holes
PCD = 90mm
HX801 Dimensions.
3
12
24mm Nom.
HX801 & HX802
160mm nom.
50mm Nom.
%RH
Transmitter.
+
-
Temperature
Transmitter.
+
-
Input 1
E.g. 2100-M-I or PLC
+
Single Ended Inputs.
(i.e. All '-' inputs
connected together).
Input 2
+
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