Novus RHT-WM Manuel utilisateur

NOVUS AUTOMATION 1/8

RHT-WM and RHT-DM Transmitter

INSTRUCTIONS MANUAL – V2.0x A

NOVUS AUTOMATION 2/8

1PRESENTATION

RHT-WM and RHT-DM transmitters feature highly accurate and stable sensors for measuring relative humidity and temperature. The measured

values are converted into 4 to 20 mA output signals linearly related to their readings.

The microprocessor-based circuit can be configured with the TxConfig communication interface and Windows software. It is possible to configure

the measurement and humidity transmission between Relative Humidity and Dew Point.

2INSTALLATION

2.1 MECHANICAL INSTALLATION

The RHT-DM (Duct Mount) model must be attached with a flange. The flange is attached to the duct wall. After this, the transmitter probe must be

inserted into the flange center hole and then fixed. Figure 1 shows the dimensions and drilling of the polyamide 6.6 flange:

Figure 1 -Mounting flange for RHT-DM

The probe is made of stainless steel, with lengths of 150 mm, 250 mm, or 400 mm:

Figure 2 -Model RHT-DM dimensions

The RHT-WM (Wall Mount) model must be attached to the wall. By removing the transmitter cover, you can access the two fixing holes and the

connector, as shown in Figure 3. To ensure the specified accuracy and protection degree, you must mount the transmitter with the sensor

capsule facing down.

Figure 3 -RHT-WM fixing holes and housing dimensions

NOVUS AUTOMATION 3/8

2.2 ELECTRICAL INSTALLATION

The transmitter has a 4-20 mA current output.

Variables can be monitored together or separately. Combinations of mobile jumpers J4 and J5 inside the transmitter housing define how variables

will be used. The jumpers also define the transmitter terminals with available output signals.

Jumper J5

Jumper J4

OUT1

OUT2

Position APosition ATemperature Humidity

Position APosition BTemperature Off

Position BPosition AHumidity Off

Position

Humidity

Temperature

Table 1 - OUT1 and OUT2 outputs configuration

Figure 4 -Location of jumpers J4 and J5 inside the transmitter

Figures below shows the required electrical connections.

Note that loop OUT1 must always be powered!

Figure 5 -4-20 mA connections Figure 6 -4-20 mA connections with a single source Figure 7 -4-20 mA model with a single

source and load with 2 input channels

In the figures above, LOAD represents the measuring instrument of the output signal (indicator, controller, register, etc.).

The connection wires go inside the transmitter trough to the cable gland mounted in the transmitter housing.

INSTALLATION RECOMMENDATIONS

•Electronic and analog signal conductors should run through the plant separately from the output and supply conductors. If possible, in

grounded conduits.

•The power supply for electronic instruments must come from a network suitable for instrumentation.

•In controlling and monitoring applications, you must consider what can happen when any part of the system fails.

•It is recommended to use RC filters (47 Ωand 100 nF, serial) in inductor charges (contactors, solenoids, etc.).

SENSOR CAUTIONS

The humidity sensor calibration may change in case it is exposed to contaminating vapors or to high humidity and temperature conditions for

extended periods. 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.

•For 24 hours, place it within an 80 °C (± 10 °C) oven.

•For 48 hours, place it in a place with temperature between 20 and 30 °C (68 and 86 °F) and humidity over 75 % RH.

•Place the sensor back in the capsule.

NOVUS AUTOMATION 4/8

SENSOR REPLACEMENT

In case of damage, the humidity and temperature sensor may need to be replaced. To perform this procedure, follow the steps below:

•Step 1: Disconnect the transmitter from the power supply. Locate the sensor protective tip.

This example shows the sensor replacement of an RHT-DM transmitter. In it, the sensor is

located at the end of the probe.

•Step 2: Remove the tip by turning it counterclockwise.

•Step 3: Without the tip, the sensor will be exposed. Remove it by pulling it forward to

disconnect it.

•Step 4: Connect the new sensor to the probe tip connector using clean antistatic gloves or

other measures to avoid static discharges. Avoid unnecessary handling.

Hold the sensor by the connector or its surroundings. Avoid

handling the sensor by the thinner end. Do not touch the

sensor.

For this procedure, it is recommended to use clean antistatic

gloves.

•Step 5: Place the protection tip again and turn it clockwise to secure it to the device.

NOVUS AUTOMATION 5/8

3CONFIGURATION

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 USB

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 software can be updated for free on NOVUS website. To install it, run the Tx_setup.exe and follow the instructions.

The TxConfig interface connects the transmitter to the PC, as shown in figure below:

Figure 8 -TxConfig Interface USB connections

Once the connection is accomplished, you must run the TxConfig software and, if necessary, use the Help topic to arrange the transmitter

configuration. Figure below shows the TxConfig software main screen:

Figure 9 -TxConfig software main window

The fields in the screen mean:

1. Measuring Range: Define the transmitter humidity and temperature measurement ranges, indicating a Lower Limit value and an Upper Limit

value.

The defined range cannot exceed the Sensor Measuring shown in this same field, and cannot establish a range with a span less than the

Minimum Range indicated below in this same field.

When the Lower Limit is set to a value higher than the Upper Limit, the output current has a decreasing behavior (20 ~ 4 mA).

2. Sensor Failure: Establish the transmitter output behavior in the presence of a sensor fail. When Minimum is selected, the output assumes its

minimum value (4 mA) (down-scale). When Maximum is selected, it assumes its maximum value (20 mA) (up-scale).

3. Zero Correction: Correct, in the output value, small measurement errors presented by the transmitter.

4. Device Information: This field contains data that identifies the transmitter and is important in any queries to the manufacturer.

5. Read Device: When selected, allows you to read the configuration present on the connected transmitter.

6. Apply: When pressed, allows you to send the configuration to the connected transmitter.

Note: The factory default configuration is (unless otherwise specified or ordered):

•Measuring ranges: 0 to 100 °C and 0 to 100 % RH.

•Correction zero: 0 °C.

•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:

NOVUS AUTOMATION 6/8

The humidity sensor has a maximum range of 0 to 100% RH and an accuracy of 3% at 25 ° C, as shown in Figure 11. We can have an error of

up to 3% RH in any adopted range.

This error is even in a wide range as the maximum (0 to 100% RH) or in a narrower range, such as 20 to 80% RH.

A serial port configuration error may occur when other software uses the same serial port. Before using it, you must terminate all

software that uses the serial port specified for TxConfig.

3.1 RETRANSMITTING THE DEW POINT

To use the RHT and transmit the dew point instead of relative humidity, you must follow the following steps:

•Connect the device to the TxConfig interface and run the software.

•The software will recognize the RHT model, read its configuration and make it available to the user.

•In the "Options" menu, enter "Humidity Reading Type" (only available when an RHT model is detected) and select the "Dew Point" option. At

this point, the values of the scales will be converted to the dew point unit, ie degrees (Celsius or Fahrenheit, as selected).

•Proceed with the configuration and send it to the device via the "Apply" button.

Figure 10 -Dew point

If the "Humidity Reading Type" option does not appear even after the RHT transmitter is correctly detected, the TxConfig software version is

probably old and does not support this feature. In this case, download and update the latest version.

NOVUS AUTOMATION 7/8

4SPECIFICATIONS

Humidity measurement

Total accuracy: See Figure 11.

Measurement range: Configurable between 0 and 100 % RH or -100 and 103 °C (-148 to 217.4) for dew

point.

Response time (1/e (63 %)): 8 seconds @ 25 °C (is slow moving air 1 m/s).

Temperature measurement

Total accuracy: See Figure 11.

Total accuracy: Configurable between -40 and 120 °C (-40 to 248 °F).

Response time (1/e (63 %)): Up to 30 s (is slow moving air 1 m/s).

Power supply 12 Vdc to 30 Vdc.

Sensor reading range < 1.5 seconds

Outputs 4-20 mA or 20-4 mA current, 2-wire loop power supply.

Output Load (RL) RL (Ohms max.) = (Vdc - 12) / 0.02 let: Vdc = Power supply in Volts.

OUT1 output resolution 0.006 mA (4-20 mA)

OUT2 output resolution 0.022 mA (4-20 mA)

Isolation between loops 4-20 mA outputs are isolated from each other.

Provides protection against

power supply polarity

inversion

Yes

Protection Electronic circuit case:IP65.

Sensor capsule: IP40.

Cable entrance Cord grip PG7.

Operating limits Sensor and Probe (RHT-DM): See Figure 11.

Electronic circuit

Electronic circuit (WM/DM):

Operating temperature: -10 to 65 °C (14 to 149 °F), 0 to 95 % RH.

Storage temperature: -20 to 80 °C (-4 to 176 °F).

Table 2 – Technical specifications

IMPORTANT

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:

Figure 11 -Humidity and temperature accuracies

NOVUS AUTOMATION 8/8

4.1 CERTIFICATIONS

CE Mark

This is a Class A product. In a domestic environment, this product may cause radio interference in which case the user may be required to take

adequate measures.

5WARRANTY

Warranty conditions are available on our web site www.novusautomation.com/warranty.

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