RHT
ABUS TECHNOLOGIES INC.
Temperature + Humidity Tx.
User Manual
WARNING
This manual should be passed on to the end user.
The contents of this manual are subject to change without prior notice.
All rights reserved.
ABUS gives no warranty of any kind with regard to this manual, including, but not limited to, fitness
for a particular purpose.
If any question arises or errors are found, or if any information is missing from this manual, please
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inform your supplier or inform at info@abustek.com
The specifications mentioned in this manual are limited to those for the standard type under the
specified model number break-down and do not necessarily apply for customized instruments.
Please note that changes in the specifications, construction, or component parts of the instrument
may not immediately be reflected in this manual at the time of change.
If the customer or any third party is harmed by the use of this product, ABUS assumes no
responsibility for any such harm owing to any defects in the product which were not predictable, or
for any indirect damages.
Although Warning hazards are related to personal injury, and Caution hazards are associated
with equipment or property damage, it must be understood that operation of damaged equipment could,
under certain operational conditions, result in degraded process system performance leading to
personal injury or death. Therefore, comply fully with all Warning and Caution notices.
Information in this manual is intended only to assist our customers in the efficient operation of
our equipment. Use of this manual for any other purpose is specifically prohibited and its contents are
not to be reproduced in full or part without prior approval of Technical Communications Department,
ABUS Technologies
.
HEALTH AND SAFETY
To ensure that our products are safe and without risk to health, the following points must be
noted:
1. The relevant sections of these instructions must be read carefully before proceeding.
2. Warning labels on containers and packages must be observed.
3. Installation, operation, maintenance and servicing must only be carried out by suitably trained
personnel and in accordance with the information given. Any deviation from these instructions will
transfer the complete liability to the user.
4. Normal safety precautions must be taken to avoid the possibility of an accident occurring when
operating in conditions of high pressure and/or temperature.
5. Chemicals must be stored away from heat, protected from temperature extremes and powders kept
dry. Normal safe handling procedures must be used.
6. When disposing of chemicals ensure that no two chemicals are mixed.
Safety advice concerning the use of the equipment described in this manual or any relevant hazard data
sheets (where applicable) may be obtained from the Company address on the back cover, together with
servicing and spares information.
.
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RHT
CATALOGUE
Contents Page No.
1. Introduction 4
2. Presentation
Technical Parameters
3. Dimensions 6
4. Ordering Details 7
5. Connections 8
6. Installation
Recommendation
7. Configuration 9
8. Maintenance 11
9. Safety Precautions 12
10. Warranty 12
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9
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1. INTRODUCTION
The Relative Humidity and Temperature Transmitters RHT-WM and RHT-DM
are microprocessor-based instruments that incorporate high-accurate and stable
sensors whose information is converted to linear 4-20 mA or 0-10 Vdc.
As they are microprocessor equipment, they can be totally configured through
the communication interface ATxConfig and ATxConfig software.
The humidity output can be configured to represent the Relative Humidity
measured or the temperature value at dew point.
The RHT-WM model is intended for wall mounting. The RHT-DM comes with a
probe tip for duct or wall mounting.
2. PRESENTATION
Technical Parameters
HUMIDITY MEASUREMENT
Accuracy: Refer to figure RHT and Temperature accuracies;
Repeatability: ±1 % RH;
Hysteresis: ±1 % RH;
Non-linearity: << 1 % RH;
Stability: < 1 %RH / year;
Span: Any value between 0 and 100 % RH or –40 and 100 °C for dew
point;
Response time: 4 seconds in slow moving air.
TEMPERATURE CHANNEL
Accuracy: Refer to figure RHT and Temperature accuracies;
Repeatability: ±0.1 °C;
Span: Between -40 and 120 °C;
Response time: Up to 30 seconds in slow moving air.
GENERAL SPECIFICATIONS
Power supply: 12 Vdc to 30 Vdc (4-20 mA model) or 18 to 30 Vdc (0-10 V
model).
Outputs: 4-20 mA or 20-4 mA current, 2-wire loop power supply, 0-10
Vdc voltage (optional).
OUT1 output resolution: 0.006 mA (4-20 mA) or 0.003 V (0-10 V);
OUT2 output resolution: 0.022 mA (4-20 mA) or 0.015 V (0-10 V);
Channel isolation: The 4-20 mA outputs are isolated from each other. The 0-10 V
outputs share a common ground;
Output Load (RL): 4-20 mA output: RL (Ohms max) = (Vdc – 12) / 0.02
Let Vdc = Loop power supply (12 to 30 Vdc)
0-10 Vdc output: RL (min) = 10 kilo ohms
Reverse polarity protection: YES
Protection: Electronic circuit case - IP65; Sensors capsule: IP40
Cable entrance: Compress fitting PG7;
Operating limits: Sensor e probe (RHT-DM): See Figure 01;
Electronic circuit: -10 to +65 °C, 0 to 95 %RH.
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Relative Humidity Accuracy at 25
°C
Temperature Accuracy
Dew point accuracy at 25°C
Sensor Operating Conditions
IMPORTANT NOTE: The transmitter sensor may be damaged or lose calibration if it is exposed to
aggressive atmospheres with high concentrations as Chloride Acid, Nitride Acid, Sulphuric Acid and
Ammonia. Acetone, Ethanol and Propylene Glycol may cause reversible measurement errors. No
accuracy improvement results from narrowing the range for the 4-20 mA output. For example, 3 %RH
accuracy will be achieved for a transmitter configured to a 20-80 %RH or to a 30-40 %RH range.
Shall any error occur in the measures taken by the sensor, they can be corrected with the
ATxConfig software? The ATxConfig interface can be connected to the transmitter even connected to
the process and under operation. See figure and Zero Correction field in the main screen of the
ATxConfig software. Measures accuracy and sensor operating limits:
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RHT and Temperature accuracies
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3. DIMENSIONS
The RHT-DM (Duct Mount) model transmitter should be installed with a flange.
This flange is first screwed onto the duct wall and the transmitter probe is then inserted
into the flange central hole and locked. Figure Mounting Flange for RHT, below shows
flange dimensions and holes. It is also available in stainless steel or polyamide 6.6.
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Mounting flange for RHT-DM.
The probe is made in stainless steel, with standard lengths of 150 mm and 250 mm.
Model RHT/DM dimensions.
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The model RHT/WM (Wall Mount) was designed to be mounted directly onto a
wall. With the cover off, the user can access the 2 fixing points and the signal
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connector, as shown in figure
RHT/WM fixing holes and housing dimensions,
below. The
transmitter sensor capsule must be placed faced down in order to assure the specified
accuracy and protection level.
RHT/WM fixing holes and housing dimensions.
4. ORDERING DETAILS
TYPE DESCRIPTION
Product
Mounting
Configuration
Output
Immersion
Length
Accessories
RHT
D
*
W Standard Length Wall Mounting
*
If Mounting is opted as
“D”, please mention the
immersion length.
M
N All parameters Factory Setting
Example: RHT > D > M > 4 > 6 > Y
Humidity and temperature transmitter
Please Specify
Immersion Length
0
4 4~20mA dc
6
10 250mm
? Customized
Duct Mounting
Range (Temp. & HY), Burnout, Programmable
0~10V dc
150mm
N None
L With LCD Display
Y With RS485 Communication
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Configuration of OUT1 and OUT2 outputs
5. CONNECTIONS
The transmitter can be ordered as 4-20 mA current output or 0 to 10 Vdc
voltage output. The output signal is defined on purchase and cannot be later changed.
Variables can be monitored together or separately. Combinations of mobile jumpers
J4 and J5 within the transmitter case define how variables will be used. The jumpers
also define the transmitter terminals with available output signals.
Jumper J5 Jumper J4 OUT1 OUT2
Position A Position A Temperature Humidity
Position A Position B Temperature Off
Position B Position A Humidity Off
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Position B Position B Humidity Temperature
Figures below shows the required electrical connections:
4-20 mA connections 0-10 VDC connections
J4 and J5 position within the transmitter
4-20 mA connections with single source
LOAD represents the output signal measurement equipment (controller, register, etc).
The connection wires go inside the transmitter through to the cable gland mounted in
the transmitter case.
04-20 mA model with single source and load with
two input channels
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6. INSTALLATION
Recommendation
Conductors of small electrical signals must be distant from activation or high-
tension/current conductors, preferably passing through grounded conduits.
A specific electrical power supply network should be provided for instruments use
only.
In controlling and monitoring applications, possible consequences of any system
failure must be considered in advance.
RC filters (47 R and 100 nF, serial) in inductor charges (contactors, solenoids, etc.)
are recommended.
7. CONFIGURATION
If the default configuration or the ordered configuration satisfies the application,
then no further configuration is necessary and the transmitter is ready to be used. If a
new setting is desired, this can be accomplished by the ATxConfig and sent to the
transmitter through the ATxConfig interface.
The ATxConfig Interface and Software compose the Transmitter Configuration
Kit, which can be purchased separately from ABUS or one of its distributors. The latest
release of this software can be downloaded from our web site. To install, run the
ATx_setup.exe and follow the instructions.
Serial port configuration errors may occur when other software are sharing the
same serial port. Close all serial port applications prior to using the ATxConfig
software.
The ATxConfig interface cable is 1.5m long. One extremity is connected to the
transmitter. The other extremity has a female connector DB9, which must be
connected to the serial port available in the PC.
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Loop Powered or Power Supply 9 Vdc Battery Power
Connections of the ATxConfig Interface
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The transmitter requires to be powered during configuration. The ATxConfig
provides powering; however this depends on the PC used. To assure proper
communication, it is recommended to apply external power to the transmitter. A 9V
battery connected to the battery socket in the ATxConfig interface extremity can be used
to power the transmitter during the configuration. Another option is to run the transmitter
configuration when it is already connected to the process, using the same power that
powers the process. Refer to figure Connections of the ATxConfig Interface.
After making such connections, users must run the ATxConfig software and, if
necessary, use the Help to configure the transmitter. Figure ATxConfig software Main
Window, shows the ATxConfig Main Windows.
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ATxConfig Main Window
The fields, in the above ATxConfig main window, are described as under:
1. Measuring range: Defines the beginning and the end of the transmitter humidity
and temperature range.
a. Lower Value: sets the value of the input signal (RH or temperature)
associated to the 4 mA output.
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b. Upper Value: sets the value of the input signal that will correspond to the 20
mA output.
When the lower limit is defined with a value higher than the higher limit the output
current operates from 20 to 4 mA. The values configured in these fields can not be
beyond the sensor measuring range. The minimum span value has to be observed as
well.
2. Sensor Failure Detection: Establishes the transmitter output behavior (upscale or
down-scale) in the presence of a sensor fail. When Minimum is selected, the output
current is < 4 mA (down-scale), typically used for refrigeration. When Maximum is
selected, the output current is > mA (up-scale), typically used in heating systems.
3. Zero Correction: Allows for small sensor corrections.
4. Device Information: Transmitter identification data. These information must be
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informed when the user contact us.
5. Read Device: Brings to the screen the current transmitter parameters
configuration.
6. Send configuration: Sends a new configuration to the transmitter.
Note: The factory default configuration is (unless otherwise specified or ordered):
Sensor RHT, temperature span 0 to 100 °C and humidity span 0 to 100 %RH;
0 °C of zero correction
Upscale when sensor fails.
8. MAINTENANCE
The calibration of the humidity sensor may change in case it is exposed to
contaminating vapors or to high humidity and temperature conditions for extended
periods. In order to speed up the calibration restoration, proceed as described below:
Remove the sensor from the capsule.
Wash it with water in case there are solid particles on it.
Place it within a 80 °C (+-10 °C) oven for 24 hours
Place it for 48 hours in a place with a temperature between 20 and 30 °C and
humidity over 75 % RH.
Place the sensor back in the capsule.
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9. SAFETY PRECAUTIONS
1. The unit should be powered for 15 minutes before use.
2. Use in ambient temperature of 0-60˚C.
3. Avoid vibrations, shock, excessive dust, corrosive chemical materials or gaseous
environment.
4. Input wire should not be too long. If measured signal have to be far away from the
unit, please use 2-core shielded cable.
5. Use this instrument in the scope of its specifications, otherwise fire or malfunctions
may result.
6. Contact of the instrument, with organic solvents or oils should be avoided.
7. Do not turn on the power supply until all of the wiring is completed. Otherwise
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electrical shock, fire or malfunction may result.
8. Do not disassemble, repair or modify the instrument.
9. All connections should be tightened properly.
10. Power supply should be constant, should not be fluctuating.
10. WARRANTY
ABUS provides the original purchaser of this instrument a one (1) year warranty
against defects in material and workmanship under the following terms:
The one year warranty begins on the day of shipment as stated on the sales bill.
During the warranty period all costs of material and labor will be free of charge
provided that the instrument does not show any evidence of misuse.
For maintenance, return the instrument with a copy of the sales bill to our factory.
All transportation and insurance costs should be covered by the owner of the
equipment.
Should any sign of electrical or mechanical shock, abuse, bad handling or misuse
be evident the warranty voids and maintenance costs will be charged.
ABUS TECHNOLOGIES INC.
www.abustek.com, E-M ail: info@abustek.com
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