Lumel P18D User manual

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USER’S MANUAL
TEMPERATURE
AND HUMIDITY
TRANSDUCER
P18D TYPE

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CONTENTS
1. APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. TRANSDUCER SET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. BASIC REQUIREMENTS, OPERATIONAL SAFETY. . . . . . . . . . . . . . . . 5
4. INSTALLATION .......................................................................... 6
4.1. Assembly ............................................................................................6
4.2. Electrical Connections ........................................................................7
5. SERVICING ................................................................................ 9
5.1. Messages after supply switching on ...................................................9
5.2. Description of P18D display ..............................................................10
5.3. Function of capacitive button ............................................................ 11
5.4. Function of the P18D transducer ...................................................... 11
5.4.1. Measured and calucated values ............................................. 12
5.4.2. Chosen of values for analog outputs.......................................13
5.4.3. Individual characteristic of analog outputs ..............................13
5.4.4. Default parameters..................................................................15
6. RS-485 interface...................................................................... 16
6.1. Serial interface connection................................................................16
6.2. Description of the Modbus Protocol Implementation.........................17
6.3. Description of the Modbus functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4. Register map.....................................................................................20
6.5. Register for write or readout..............................................................21
6.6. Register only for readout...................................................................24
6.7. Emergency restoration of default parameters ...................................26
7. ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8. TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9. ORDERING CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10. MAINTENANCE AND GUARANTEE ....................................... 31

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1. APPLICATION
The P18D transducer is device destined for the continuous measure-
ment and conversion of relative humidity and ambient temperature into
a digital form and into a voltage or current standard signal. The trans-
ducer is fixed on a wall. The programming of the transducer is possible
by means of the RS-485 interface. The transducer configuration can
be carried out by the free LPCon program available on our website
www.lumel com.pl/en/.
Applied sensor shields enable the application of the P18D transducer in
various ambient conditions
Fig.1. View of the P18D transducer.
2. TRANSDUCER SET
1. ransducer P18D..................... 1 pc
2. service manual........................ 1 pc
3. guarantee card........................ 1 pc
3. BASIC REQUIREMENTS, OPERATIONAL SAFETY
In the security scope, the transducer meets the requirements of the
EN 61010 -1 standard.
Remarks Concerning the Operator Safety:
1. General
· All operations concerning transport, installation, and commissioning as
well as maintenance must be carried out by qualified, skilled personnel

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· Before switching the transducer on, one must check the correctness
ofconnections to the network.
· The device is destined to be installed and used in industrial electro-
magnetic environment conditions.
4. INSTALLATION
4.1. Assembly
The P18D transducer is designed to be mounted on a wall by means of
a screw connection or glue without the loss of IP65 tightness.
The transducer housing is made of a self-extinguishing plastics.
The transducer has screw connectors placed inside the transducer,
which enable the connection of external wires of 1 mm2cross-section.
Fig.2. Overall Dimensions of the P18D Transducer

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Fig.3. Lay-out of Assembly Holes of the P18D Transducer
4.2. Electrical Connections
The P18D transducer has 8 connecting terminals to which there is
access after removing the cover of the transducer housing.
For electrical connections, one must use a round wire with external dia-
meter from 3.5 mm up to 6 mm.
Before the transducer assembly, one must remove the LCD display,
pass supplying wires through the packing. Twist the packing seal in
order to obtain the leaktightness. If the packing seal is not twisted,
we cannot ensure the required IP 65 leaktightness. After screwing the
wires to the terminal, the LCD dispaly should be put back.
Fig.4. Marking of Terminals for the Connection of External Signals

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Transducer
without analog outputs
Transducer
with current outputs
Transducer
with voltage outputs
Fig. 5. Way of Electrical Signal Connection
To connect the input signals in an environment with high interference,
one must apply shielded wires. The shield must be connected to the
nearest PE point from the feeder side.
OUT1
( C)
OUT 2
(RH)
OUT 1
( C)
OUT 2
(RH)

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5. SERVICING
The transmitter is equipped with a 8x2 characters display field with
backlight and one capacitive button located on the transmitter housing.
After connecting wires, closing and servicing the housing, and connecting
to the supply, the transducer is ready to work with manufacturer’s settings
(table 8).
The transducer can be programmed through the RS-485 interface.
One can program following parameters in the transducer:
-c o mmunication parameters
-a v eraging time of the measurement,
-i n dividual characteristics of analog outputs
(for executions with analog outputs).
There is the possibility to connect the transducer through another trans-
mission media, like: ETHERNET, USB, using LUMEL S.A.’s converters.
5.1. Messages after supply switching on
After connecting external signals and switching the supply on,
the transducer displays the type, the current software version, serial number
and set the communication parameters (address, baud rate and mode).
After about 5 seconds, the transducer automatically switches to the
mode in which it measures and converts into the analog output signal.
The transducer displays the measured value with the unit on the bottom
row of the display, on the top row of the display contains information about
the type of displayed value and pictograms: of transmission on RS-485
link, the mode of presentation of the measured value and the ratio of the
measured value read from the sensor.

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Symbol Description
T: Type of displayed value in the lower line of LCD - temperature
RH: Type of displayed value in the lower line of LCD – relative humidity
DP: Type of displayed value in the lower line of LCD – dew point
AH: Type of displayed value in the lower line of LCD – absolute humidity
Readout ratio of measured value from the sensor
Automatic mode of measured values presentation – type of displayed
value is automatically switched every 3 seconds in following order:
temperature grealtive humidity gdew point gabsolute
humidity gtemperature ...
Indicator of data receive on the RS-485 interface
Indicator of data transmission on the RS-485 interface
5.2. Description of P18D display
Readout field in the transducer P18D is backlite character LCD. The
backlight is lit after turning on the power and the capacitive button is
pressed on the case. The backlight is turned off automatically after 30
seconds of inactivity time.
Fig.6 Description of P18D transducer readout field.
Indicator of measured value
readout from the sensor
Unit
Indicator of automatic presentation
of measured values
Indicator of transmission
on RS-485 interface
Measured value
Type
of measured value
The displayed symbols are shown in the table 1.
Tab le 1