Lumel P18S User Manual
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Lumel P18S User Manual

Temperature and humidity transducer
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TEMPERATURE
AND HUMIDITY TRANSDUCER
P18S
USER'S MANUAL
1

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Summary of Contents for Lumel P18S

  • Page 1 TEMPERATURE AND HUMIDITY TRANSDUCER P18S USER’S MANUAL...

  • Page 3: Table Of Contents

    Contents 1. AppliCAtion ................5 2. trAnsduCer set ..............6 3. BAsiC requirements, operAtionAl sAfety ..... 6 4. AssemBly ................... 6 4.1. InstallatIon ............... 6 4.2. ExtErnal connEctIons dIagram ....... 8 5. operAtion ................. 9 5.1. transducEr functIons ..........10 5.1.1.

  • Page 5: Application

    1. AppliCAtion the p18s transducer is designed for continuous measure- ment and conversion of relative humidity and ambient temperature into a digital form (modBus rtu protocol via the rs-485 interface). trans- ducer configuration is possible using the modBus protocol. values measured and calculated by the transducer: • temperature,...

  • Page 6: Transducer Set

    2. trAnsduCer set − p18s transducer 1 pc. − user’s manual 1 pc. 3. BAsiC requirements, operAtionAl sAfety In terms of operational safety, the transducer meets the requi- rements of En 61010-1 standard. safety instructions • the assembly and the installation of the electrical connections may be carried out only by a duly qualified electrician.
  • Page 7 50mm Fig.2. External dimensions of P18S...

  • Page 8: External Connections Diagram

    4.2. external connections diagram the transducer has a 4-wire non-detachable cord which is 2.5 or 10m long or a detachable m8 socket with a 2-meter long wire (depending on the version code) used for supplying and connecting the rs-485 inter- face: M8 socket (terminal number)

  • Page 9: Operation

    5. operAtion after wiring and turning on the power supply, the transducer is ready for operation with the factory settings. operation of the transducer is signaled by a short, repeatable illumination of the yellow lEd located under the sensor cover. the transducer can be configured by recording modBus rtu pro- tocol registers on the rs-485 interface.

  • Page 10: Transducer Functions

    • rs-485 interface support in modBus protocol in rtu mode. 5.1.1. Calculated values the p18s transducer calculates the dew point and absolute humidity va- lues on the basis of the temperature and relative humidity measurement from the following relationships.
  • Page 11  RH AH = 2,1668  AH → absolute humidity: 100  (T + 273,2) where: T → measured temperature [ RH → measured relative humidity [%] DP → dew point temperature [ → saturated steam pressure (vapor pressure) [mbar] AH → absolute humidity [g/m Coefficients used to calculate the dew point < 0 6.119866 7.926104 250.4138 0...50 6.1078 237.3 50...100 5.9987 7.3313 229.1 Table 2: Coefficients used to calculate the dew point...

  • Page 12: Operation Of The Internal Heater

    5.1.2. operation of the internal heater the sensor used in the p18s transducer is equipped with an internal heating element enabling faster release of water molecules from sensors flooded with water or from sensors which operate in a moist environment for a long time. switching on the heater is possible by re- cording the appropriate value to the register 4020 (see table 9).

  • Page 13: Description Of Modbus Protocol Implementation

    5.1.4. description of modBus protocol implementation Zaimplementowany protokół jest zgodny ze specyfikacją PI-MBUS-300 Rev G firmy Modicon. Fabryczne parametry to: adres urządzenia 1, prędkość 9600 [b/s] format ramki 8n1. list of serial link parameters of the p18s transducers in the modBus protocol: • transducer address 1..247, • Baud rate: 2400, 4800, 9600, 19200, 38400, 57600, 115200 [b/s], • operating mode: rtu with frame in the following format: 8n2, 8e1,...

  • Page 14: Description Of Implemented Functions

    5.1.5. description of implemented functions the following modBus functions have been implemented in the p18s transducers: • 3 (03h) – readout of a register group, • 4 (04h) – readout of an input register group. • 6 (06h) – recording of a single register.

  • Page 15: Map Of Registers

    5.1.6 map of registers In the p18s transducer the data is placed in 16- and 32-bit regi- sters. process variables and parameters of the transducer are located in the address space of registers in a manner dependent on the type of the variable.

  • Page 16: Read-Only Registers

    5.1.7. read-only registers 7000 7500 device Id 7002 7501 measured temperature 7004 7502 measured relative humidity 7006 7503 calculated dew point 7008 7504 calculated absolute humidity 7010 7505 min t minimum temperature 7012 7506 max t maximum temperature 7014 7507 min rh minimum relative humidity 7016...

  • Page 17: Registers For Writing And Reading

    Table 8: Read-only registers 5.1.8. registers for writing and reading name range description 4000 Identifier p18s device Id (228 - E4h) 4001 address 1...247 address of modbus device 4002 rs-485 0...6 description interface baud rate...
  • Page 18 4003 transmis- 0...3 description sion mode rs-485 rtu 8n1 rtu 8n2 rtu 8E1 rtu 8o1 4004 a p p l y i n g 0...1 description c h a n g e s and saving no changes c o n f i g u r a - tion to non- configuration save - v o l a t i l e...
  • Page 19 4017 device specifies the current state of status the transducer. the subse- quent bits determine the oc- currence of the given event. value 1 - the event has oc- curred, value 0 - no event. the meaning of the subsequ- ent bits: 15 –...
  • Page 20 4020 control of 0...2 description the internal heater switching the heater switching the heater on until it is manually switched off switching the heater on for a certain time 4021 the time 60...32768 the time the heater is swit- ched on [s]. When the hea- the heater ter is switched on in the time is switched...

  • Page 21: Accessories

    6. ACCessories as standard, the p18s transducer is equipped with a sensor cover designed only for indoor applications. for outdoor applications and indoor applications with exposure to the possibility of condensation, it is recommended to use additional sensor covers (interchangeably), depending on the transducer operating conditions.

  • Page 22: Technical Data

    7. teChniCAl dAtA Basic parameters: - range of relative humidity (rh) measurement 0...95%, without condensation - intrinsic error of humidity processing ± 3%of the range for RH = 10...90% ± 5% in the remaining range - hysteresis of humidity measurement ± 1% RH - basic range of temperature measurement (t) -20...60°c - intrinsic error of temperature processing ± 0,6% within the range 10...40 ...

  • Page 23: Ordering Code

    - pollution degree - operating voltage relative to earth 50 v - altitude above sea level < 2000m 8. ordering Code P18S - Connection way: socket-plug M8 …, 2 m wire (included) wire 2 m wire 5 m wire 10 m...
  • Page 24 LUMEL S.A. ul. Sulechowska 1, 65-022 Zielona Góra, POLAND tel.: +48 68 45 75 100 www.lumel.com.pl Export department: tel.: (+48 68) 45 75 139, 45 75 233, 45 75 321, 45 75 386 fax.: (+48 68) 32 54 091 e-mail: export@lumel.com.pl...

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