NOVUS RHT - D M - Manual

INSTALLATION
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. Fig. 04 below shows flange dimensions and holes. Available in stainless steel
or polyamide 6.6.
Fig. 04 - Mounting flange for RHT/DM.
The probe is made in stainless steel, with standard lengths of 150 mm, 250 mm and 400 mm.
Fig. 05 - Model RHT/DM dimensions.
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 connector, as shown in Fig. 06.
The transmitter sensor capsule must be placed faced down in order to assure the
specified accuracy and protection level.
Fig. 06 - RHT/WM fixing holes and housing dimensions.
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.
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
Table 01 – Configuration of OUT1 and OUT2 outputs
Fig. 07 – J4 and J5 position within the transmitter
Fig. 08 and 09 show the required electrical connections.
Check that loop OUT1 must always be powered in 4-20 mA model!
Fig. 08 – 4-20 mA connections Fig. 09 – 0-10 Vdc connections
Fig. 10 – 4-20 mA connections with single source Fig. 11 – 4-20 mA model with single source and
load with two input chanels
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.
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 H T - W M a n d R H T - D M
O P E R A T I N G M A N U A L
Man 5000232
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.
WARRANTY
Warranty conditions are available on our web site www.novusautomation.com .