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Lumel P18 User Manual

Temperature and humidity transducer
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TEMPERATURE AND HUMIDITY
TRANSDUCER
P18(D)
USER'S MANUAL
1

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  • Page 1 TEMPERATURE AND HUMIDITY TRANSDUCER P18(D) USER’S MANUAL...

  • Page 3: Table Of Contents

    5.3. Functions of the P18D transducer capacitive button .... 13 5.4. Programming parameters menu of the P18D transducer ..14 5.5. Functions of the P18(D) transducer ........15 5.5.1. Calculated values .............. 16 5.5.2. Selection of controlling values for analog outputs ..... 16 5.5.3.

  • Page 5: Application

    Applied sensor shields enable the application of the transducers in various ambient conditions. Fig. 1. Overview of the P18 and P18D transducers with the probe on the housing.
  • Page 6 Fig. 2. Overview of the P18 and P18D transducers with the probe on the wire 0,5 m.

  • Page 7: Transducer Set

    4. INSTALLATION 4.1. Assembly The P18(D) 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 trans-...
  • Page 8 Fig. 3. Overall dimensions of the P18(D) transducer mounting holes Fig. 4. Lay-out of mounting holes of the P18(D) transducer...

  • Page 9: External Connection Diagrams

    4.2. External connection diagrams The P18(D) transducer version P18(D)-1XXX or P18(D)2XXX has 8 connecting terminals, version P18(D)-0XXX has 4 terminals (ver- sion without analog outputs). Access to the terminals is possible after removing the cover of the transducer housing. You should use a multi- conductor round wire with external diameter from 3.5 mm up to 6 mm...
  • Page 10 Transducer with voltage outputs Fig. 6. Wiring diagram of the P18(D) transducer with analog outputs Use shielded cable for supply and output signals in environ- ments with high levels of interference. The shield must be connected to the nearest PE point from the feeder side.

  • Page 11: Service

    The P18D transducer is equipped with a display field 8x2 characters with illumination and one capacitive button located on the housing. The P18 transducer is not equipped with a display or a button. After connecting the wires, closing and servicing the housing, and connecting to the supply, the transducer is ready to work with manufacturer’s settings (Tab.

  • Page 12: Description Of The P18D Transducer Readout Field

    5.2. Description of the P18D transducer readout field The illuminated character LCD is a readout field in the trans- ducer P18D. The illumination is turned on after switching on the supply and after the capacitive button on the housing is pressed. The illumina- tion is automatically switched off after 30 sec.

  • Page 13: Functions Of The P18D Transducer Capacitive Button

    Type of the displayed value in the bottom line of the LCD - dew-point Type of the displayed value in the bottom line of the LCD - absolute humidity The indicator of the measuring value from the sensor Automatic mode of measurement results presentation - a type of displayed value is automatically switched every 3 seconds in the following order: temperature →...

  • Page 14: Programming Parameters Menu Of The P18D Transducer

    Capacitive button is used to: • switch the display illumination on • change the presentation mode of the measurement results - holding the button for about 2 seconds switches from automatic mode to manual mode or inversely • change the type of displayed values in the manual mode of presen- tation of the measurement results - pressing the button for a short time changes the displayed value.

  • Page 15: Functions Of The P18(D) Transducer

    Fig. 10. Programming parameters algorithm of the P18D transducer 5.5. Functions of the P18(D) transducer The P18(D) transducer carries out the functions: • measurement of the ambient temperature and relative humidity • calculation of chosen physical quantities (dew-point temperature, absolute humidity, wet bulb temperature) •...

  • Page 16: Calculated Values

    5.5.2. Selection of controlling values for analog outputs The P18(D) transducers in versions P18(D)-1XX, P18(D)- -2XX, P18(D)-4XX, P18(D)-5XX are equipped with two programmable analog outputs (voltage or current). By default, the first analog output is set for a presentation of the ambient temperature and the second analog output is controlled by the value of the relative humidity.

  • Page 17: Individual Characteristic Of Analog Outputs

    4016 for the second analog output (Tab. 14). 5.5.3. Individual characteristic of analog outputs The P18(D) transducers in the version with analog outputs enable the conversion of measured values into an output signal ba- sed on the strength of individual linear characteristic of analog outputs.
  • Page 18 The configuration of the individual characteristic of analog outputs amounts to the introduction of suitable values X1, X2, Y1, Y2 in corresponding registers to them from the range 4007 – 4014 Tab. 3. The values introduced in these registers must be integral values corre- sponding to the set point values multiplied by the value 100.

  • Page 19: Support Of A Sensor Heater

    5.5.4. Support of a sensor heater The sensors used in the P18(D) transducers are equipped with internal heating elements to allow faster release of water molecu- les from the sensor being flooded or working a long time in highly hu- mid environments.

  • Page 20: Default Settings

    5.5.5. Default settings The Table 4 shows the standard settings of the P18D transdu- cer. The settings can be restored via the RS-485 interface after writing the value „1” to the registry 4020. Table 4 Standard value Para- Parameter meter P18D-0XX, P18D-1XX, P18D-2XX,...

  • Page 21: Rs-485 Interface

    Caution: For the transmitter versions without analog outputs (P18 (D) -0XX and P18 (D) -3XX), the RS-485 interface is galvanically isolated from the supply - 1 kV separation. For the transmitter versions with analog outputs, the RS-485 interfa- ce is not isolated from the supply or from the analog outputs.
  • Page 22 Output of the interface line is shown in Fig. 6. It is required to con- nect the lines A and B in parallel with their equivalents in other devices to obtain the correct transmission. The connection must use a shielded wire.

  • Page 23: Description Of The Modbus Protocol Implementation

    6.2. Description of the MODBUS protocol implementation The implemented protocol is compliant with the PI-MBUS-300 Rev G specification of Modicon. Set of parameters of the P18D transducer serial link in the MODBUS protocol: • Transducer address 1..247. • Baud rate: 4800, 9600, 19200, 38400, 57600, 115200 [b/s]. •...
  • Page 24 Readout of n-registers (code 03h) Example 1. Readout of 2 registers, starting with the register address 1D4Dh (7501) float (32-bit), (register values 25.68, 20.25.) Request: Table 5 Register address Number of registers Device CRC check- Function address 5270h Response: Table 6 Value from the register Value from the register Num-...
  • Page 25 Writing n-registers (code 10h) Example 3. Writing the value 78h (120) and the value 4h (4) to the regi- sters FA1h, FA2h (4001, 4002) Table 9 Request: Register Register Num- value value Device Fun- Register Number of ber of 4001 4002 address ction...

  • Page 26: Map Of The Registers

    IEEE-754 standard. Bytes sequence: B3 B2 B1 B0 – the oldest byte is transmitted as the first. A following map is the map of P18(D) transducers registers. Caution: All listed addresses are physical addresses. Some computer programs use logic addressing, then the addresses should be increased by 1.

  • Page 27: Registers For Writing And Readout

    Table 14 6.5 Registers for writing and readout Name Range Description 4000 Identifier P18 device identifier P18D device identifier 4001 Address 1...247 Device address 4002 RS-485 0...5 Description baud rate 4800 bit/s 9600 bit/s 19200 bit/s 38400 bit/s 57600 bit/s...
  • Page 28 4004 Confir- 0...1 Description mation of trans- No change mission parameters Confirmation of changes changes 4005 Averaging 6...3600 Averaging time of the mea- time surement [s] 4006 Erasing 0...1 Description the extre- No change Erasing the min. and max. values 4007 X1 of -32768 Value controlling...
  • Page 29 4015 Value 0...3 Description controlling 1 analog Temperature output. Relative humidity Dew-point Absolute humidity Wet bulb tempera- ture 4016 Value 0...3 Description controlling 2 analog Temperature output. Relative humidity Dew-point Absolute humidity Wet bulb tempera- ture...
  • Page 30 4017 Status -32768 Transducer status. Shows ...32767 the current state of the trans- ducer and the hardware con- figuration. Successive bits represent the event. Bit set to 1 indicates that the event took place. Bit15 Restart of the su- pply, writing the value -32768 (8000h) will clear the status bit Bit14 Error of the calibra-...
  • Page 31 Bit12 not used Bit11 Indicator of switching the heater on Bit10 Indicator of erasing extremes, wri- ting the value 1024 (400h) erases status bit Bit9 Temporary commu- nication parameters are set (shorten jum- per „ZW”) Bit8 LCD display error Bit7 Error reading the va- lue from the sensor Bit5,...
  • Page 32 Bit2 results averaging in- terval has ended Bit1 transducer equipped with analog outputs - vol- tage. Bit0 transducer equipped with analog outputs - cur- rent. 4018 Software 1...999 Software version x100 version...

  • Page 33: Registers For Readout

    6.6 Registers for readout Table 15 7000 7500 P18(D) device identifier 7002 7501 Measured temperature 7004 7502 Measured relative humidity 7006 7503 Calculated dew-point 7008 7504 Calculated absolute humi- dity 7010 7505 min T Min. of temperature 7012 7506 max T Max.
  • Page 34 7028 7514 Water vapor pressure Table 16 shows the registers of measuring values of the P18D transdu- cer working in the registers 7000 and 7500 compatibility mode with the P14W transducer Table 16 Name 7000 7500 P18(D) device iden- tifier...
  • Page 35 7002 7501 Measured tempera- ture 7004 7502 Calculated dew-point 7006 7503 Measured relative 7008 7504 humidity 7010 7505 Calculated absolute humidity 7012 7506 7014 7507 7016 7508 7018 7509 min T Min. of temperature 7020 7510 max T Max. of temperature 7022 7511 min DP...

  • Page 36: Emergency Restoration Of Default Parameters

    6.7 Emergency restoration of default parameters If the communication parameters have been changed and the new configuration is lost, you can use the jumper marked „ZW” on the transmitter’s board to set the temporary communication parameters: • address • baud rate 9600 kb/s •...

  • Page 37: Error Codes

    P18D display during operation. The table below lists the error codes which are possible to be displayed and their reasons as well as the recommended user responses. Information about the existing errors is also available in the P18(D) transducers status register - register 4017. Table 17 bit no.

  • Page 38: Accessories

    8. ACCESSORIES As a standard, the P18(D) transducer is equipped with a shield of the sensor, destined only for indoors applications. It is recommended to use additional shields of the sensor (interchangeable) for outdoors or indoors applications exposed to the possibility of water vapor condensa- tion, depending of the transducer working conditions.

  • Page 39: Technical Data

    - basic error of temperature conversion ± 0.5% of the range* * for the versions with analog outputs P18(D)-1, P18(D)-2, P18(D)-4 or P18(D)-5, a basic error of temperature conversion may increase by 0.2°C - calculated values absolute humidity (a) [g/m...

  • Page 40: Electromagnetic Compatibility

    Rated operating conditions: - supply 9...24 V a.c./d.c. - power consumption < 0.5 VA - ambient temperature - 20...23...60 - relative air humidity < 95% - rate of air flow  0,5 m/s - preheating time 15 minutes - protection grade ensured by the housing IP 65 - fixing...

  • Page 41: Ordering Code

    7. ORDERING CODE Table 10 Code Description P18 000M0 Temperature and humidity transducer P18 without analog outputs; sensor on the housing; documentation and descriptions in Polish and English version, without any extra requirements P18 100M0 Temperature and humidity transducer P18 2x analog output 4-20mA;...

  • Page 42: Technical Support

    LUMEL S.A. ul. Słubicka 4, 65-127 Zielona Góra, Poland tel.: +48 68 45 75 100, fax +48 68 45 75 508 www.lumel.com.pl Technical support: tel.: (+48 68) 45 75 143, 45 75 141, 45 75 144, 45 75 140 e-mail: export@lumel.com.pl Export department: tel.: (+48 68) 45 75 130, 45 75 132...

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P18d

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