NOVUS RHT-XS User Manual
INSTALLATION
Figure 06 – Electronic module dimensions
Figure 07 – Fixing holes
Figure 08 – Remote sensor model dimensions (mm)
Jumper J5
Jumper J4
OUT1
OUT2
Position A
Position A
Temperature
Humidity
Position A
Position B
Temperature
Off
Position B
Position A
Humidity
Off
Position B
Position B
Humidity
Temperature
Check that loop OUT1 must always be powered in 4-20 mA model!
Figure 11a – 4-20 mA connections
Figure 12a – 0-10 Vdc connections
Figure 11b – 4-20 mA connections with single source
Figure 12b – 4-20 mA model with single source
and load with two input channels
The RHT-P10 electronic housing is designed for wall mounting, while its remote sensor probe is
intended for inserting and screwing in a flange.
Remove the housing front panel to access the two fixing holes, shown in Figure 07.
ELECTRICAL 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.
Figure 10 – J4 and J5 position within the transmitter
Figures 11 and 12 show the required electrical connections.
H U M I D I T Y A N D T E M P E R A T U R E T R A N S M I T T E R
R HT- XS
O P E R A T I N G M A N U A L
Table 01 – Configuration of OUT1 and OUT2 outputs
LOAD represents the output signal measurement equipment (controller, register, etc.).
The connection wires go inside the transmitter trough to the cable gland mounted in the
transmitter case.
INSTALLATION RECOMMENDATIONS
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.
ATTENTION
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.
Man 5000282
WARRANTY
Warranty conditions are available on our web site www.novusautomation.com.
SPECIFICATIONS
Relative Humidity Accuracy @ 25 ºC
Temperature Accuracy
Dew Point Accuracy @ 25 ºC
RH Sensor Operating Conditions
The TxConfig interfaces contain dedicated circuitry for proper
communication between transmitters and computer. Always make use of
the TxConfig interfaces for configuration purposes, otherwise the
transmitters may get damaged, voiding the warranty.
Humidity:
Total accuracy: Refer to Figure 01;
Measuring range: Configurable between 0 and 100 % RH or –100 and 103 °C for dew point;
Response time (1/ e (63 %)): 8 seconds @ 25 ºC (is slow moving air 1 m/s);
Temperature measurement:
Total accuracy: Refer to Figure 01;
Measuring range: Configurable between -40 and 120 °C (*);
Response time (1/ e (63 %)): up to 30 seconds (is slow moving air 1 m/s);
General specifications:
Outputs: 4-20 mA model: 4-20 mA current, 2-wire (loop power supply)
0-10 V model: 0-10 Vdc / 2 mA max.
Power supply: 4-20 mA model: 12 Vdc to 30 Vdc
0-10 V model: 18 to 30 Vdc / 15 mA max.
Output Load (RL): 4-20 mA model: RL (Ohms max.) = (Vdc – 12) / 0.02
Where: Vdc= Voltage supply in Volts.
0-10 Vdc model: 2 mA max.
OUT1 output resolution: 0.006 mA (4-20 mA) / 0.003 V (0-10 V);
OUT2 output resolution: 0.022 mA (4-20 mA) / 0.015 V (0-10 V);
Isolation between loops: The 4-20 mA outputs are isolated from each other.
The 0-10 V are not isolated from each other.
Provides protection against power supply polarity inversion;
Operating limits: Eletronic circuit: -10 to +65 °C, 0 to 95 % RH
Sensor: -10 to +65 °C, 0 to 95 % RH (*)
Protection standard: Eletronic circuit case: IP65; Sensors: IP40
Cable entrance: Compress fiting PG7
Cable length: 3 m (other lengths available upon request)
(*) Although the transmitter can be configured with a measuring range from -40 up to +120 °C,
the sensor module must not be submitted to temperatures out of the -10 to +65 °C range.
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.
Measures Accuracy and Sensor Operating Limits:
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 TxConfig and sent to the transmitter through the TxConfig
interface.
The TxConfig Interface and Software compose the Transmitter Configuration Kit, with can be
purchased separately from the manufacturer or one of its distributors. The latest release of this
software can be downloaded from our web site. To install, run the Tx_setup.exe and follow the
instructions.
The TxConfig interface connects the transmitter to the PC, as shown in Figures 02 and 03.
There are two types of interface: TxConfig-RS232 and TxConfig-USB.
Figure 02 – TxConfig Interface connections model RS232.
Figure 03 – TxConfig Interface USB connections
Once the connection is accomplished, the software shows the configuration options of the
transmitter model attached. Access the Help for usage instructions.
Figure 04 shows the TxConfig software main screen.
The fields in the screen mean:
1. Measuring Range: Defines the output scale for the input sensor. Program here the
measurement Lower Range Value and the Upper Range Value.
The values configured in these fields cannot be beyond the sensor measuring range. The
minimal span value has to be observed as well.
When the lower limit is defined with a value higher than the Higher Limit the output current
operates from 20 to 4 mA.
2. Sensor Failure: 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 (downscale), 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 informed
when the user contact us.
5. Read Device: Brings to the screen the current transmitter parameters configuration.
6. Apply: Sends a new configuration to the transmitter.
Note: The factory default configuration is (unless otherwise specified or ordered):
RHT sensor, temperature span 0 to 100 ºC and humidity span 0 to 100 % RH;
0 °C of zero correction.
Upscale when sensor fails.
It is important to notice that the transmitter accuracy is always based on the total span of the
used sensor, even if a narrower range is configured. Example:
Humidity sensor has a total span of 0 to 100 % and accuracy of 3 % at 25 °C, as showed in
Figure 01. This 3 % RH error is the same no matter if the total span is configured (0 to 100 %) or
a narrower span (like 20 to 80 %).
Este erro é mesmo em uma faixa ampla como a máxima (0 a 100 %RH) ou em uma faixa mais
estreita, como 20 a 80 %RH.
During configuration, the transmitter needs to be electrically powered. TxConfig-USB interface
can provide the power to the transmitter, but this also depe nds on the used computer hardware.
The TxConfig-RS232 interface, however, requires an auxiliary supply for guarantee reliable
communication with the computer. An external 9 V battery can be used for this purpose (Figure 02).
An alternative is to configure the transmitter while it is in operation; this way, the needed energy is
supplied by the current loop. See Figure 05.
Figure 01 – RH and temperature accuracies
Figure 04 – TxConfig software main window
Figure 05 – TxConfig Interface connections – loop powered
Serial port configuration errors may occur when other software are sharing the same serial port.
Close all serial port applications prior to using the TxConfig software.
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