NOVUS RHT-P10 - Manual (Page 2)

SPECIFICATIONS
Humidity measurement:
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 %)): 4 seconds @ 25 ºC (in 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 (in slow moving air 1 m/s);
General specifications:
Power supply: 4-20 mA model: 12 Vdc to 30 Vdc
0-10 V model: 18 to 30 Vdc / 15 mA max.
Outputs: 4-20 mA or 20-4 mA current, 2-wire – loop power supply;
0-10 Vdc / 2 mA máx. (0-10 V model)
Output Load (RL): 4-20 mA output: RL (Ohms max.) = (Vdc – 12) / 0.02
Where: Vdc= Loop 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 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:
Electronic circuit: -10 to +65 °C, 0 to 95 % RH.
Sensor: See Figure 01.
Max. pressure allowed in the probe: 10 Bar (145 PSI)
Protection standard: Electronic circuit case: IP65; Sensors capsule: IP40
Cable entrance: Compress fitting PG7
Process connection: stainless steel 304, ½” NPT thread (others upon request)
Cable length: 3 m (other lengths available upon request)
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:
Relative Humidity Accuracy @ 25 ºC Temperature Accuracy
Dew Point Accuracy @ 25 ºC RH Sensor Operating Conditions
Figure 01- RH and Temperature accuracies
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.
Figure 04 – TxConfig software main window
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 (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 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 %).
During configuration, the transmitter needs to be electrically powered. TxConfig-USB interface
can provide the power to the transmitter, but this also depends 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 05 – TxConfig Interface connections – Loop powered
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.
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.