User Manual - Cometsystem.com
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1. 340g T3319P 2m probe 380g T3319P 4m probe 460g T7311 1m probe 290g T7311 2m probe 330g T7311 4m probe 410g T3419P 1m probe 260g T3419P 2m probe 300g T3419P 4m probe 380g T7311L T3319L T7411 L T3419 L 1m probe 210 g T7311L T3319L T7411 L T3419 L 2m probe 250 g T7311L T3319L T7411 L T3419 L 4m probe 330 g Material of the case ABS Material of the probe T3319P T3419P duralumin with the black eloxal surface finish End of operation Device itself after its life is necessary to liquidate ecologically TE SNC T33 4 19 T73 4 11 08 14 Technical support and service Technical support and service is provided by distributor For contact see warranty certificate Appendix A Connection of transmitters with RS485 output to the PC CANON 9 female USB PC ELO214 bit gt 6V 200mA ELO E06D gt B PC COM PORT CANON 9 CANON 9 male female The ELO E214 converter is an optional accessory for connection of transmitter with RS485 interface to the PC via USB port Link RS485 is connected across pin 9 A and pin 8 B The pull up pull down and termination resistors are part of the transmitter These internal resistors can be connected to the bus by connecting the corresponding pins of CANON connector for more information see the operation manual for ELO E214 The ELO E06D converter is an optional accessory for connection of transmitter with RS485 interface to the PC via serial port RS232 Connect2. T7311 39 5 mm transmitter with RS232 serial output probe for compressed air measurement z E O lt y 69 0 mm 18 0 mm Typical application wiring of T3319 P and T7311 RS232C PC9 RS232C PC9 5 7 2 5 5 red yellow black brown id ANOUN Power 9 30V red yellow black brown power from communication port IE SNC T33 4 19 T73 4 11 08 power from external voltage source 72 5 mm Dimensions T3419 P T7411 transmitter with RS485 serial output 39 5 mm a probe for compressed air measurement a E uy o E T a eas i y 150 18 0 mm 88 0 mm 69 0 mm Typical application wiring of T3419 P T7411 connection of terminals Power 9 30V TE SNC T33 4 19 T73 4 11 08 72 5mm Dimensions T3319L T3419L T7311L T7411L 88 5 mm 39 5 mm Connection see Appendix B oO rey re X o N y Info mode If in doubt of setting of installed device verification of its address is enabled even without using computer Power should be connected Devices with RS232 interface have address always set to one Unscrew device cover and shortly press button next to connection terminals jumper should be opened Actual adjusted address of t
3. error does NOT affect pressure measurement Rest values are NOT measured It is a serious error contact distributor of the device TE SNC T33 4 19 T73 4 11 08 10 Error 4 there is a reading Err4 on LCD display It is internal device error during pressure sensor initialization Under this condition device does NOT measure atmospheric pressure Value read from device is 999 9 Pressure sensor is probably damaged It is a serious error contact distributor of the device Readings on LCD display C F reading next to this symbol is measured temperature or error state of value RH teading next to this symbol is measured relative humidity or error state of value hPa PSI inHg reading next to this symbol is measured pressure or error state of value If selected pressure unit is mBar or oz in or mmHg or inH2O or kPa there is shown only value number without corresponding pressure unit C F DP reading next to this symbol is calculated dew point temperature or error state of value g m reading next to this symbol is calculated absolute humidity or error state of value g kg reading next to this symbol is calculated specific humidity or mixing ratio depends on device setting or error state of value If specific enthalpy is selected there is shown only value number without corresponding unit symbol 3 near by left display margin is on if jumper is closed Technical parameters of the device RS 485 Interfac
4. measurable resistance of temperature sensor probably opened circuit e Relative humidity is higher than 100 i e damaged humidity sensor or humidity calculation of humidity is not possible due to error during temperature measurement e Computed value calculation of the value is not possible error during measurement of temperature or relative humidity or value is over range Error 2 there is a reading Err2 on LCD display Measured or calculated value is below lower limit of allowed full scale range Value read from the device is 999 9 This state appears in case of e Measured temperature is lower than approximately 210 C i e low resistance of temperature sensor probably short circuit e Relative humidity is lower than 0 i e damaged sensor for measurement of relative humidity or calculation of humidity is not possible due to error during temperature measurement e Measured pressure value with added correction for altitude is outside of range from 300 hPa to 1350 hPa from 4 351 PSI to 19 580 PSI or the pressure sensor is damaged Please check setting of pressure correction for altitude with User s software e Computed value calculation of computed value is not possible error during measurement of temperature or relative humidity Error 3 there is a reading Err3 on LCD display upper line Error of internal A D converter appeared converter does not respond probably damage of A D converter This
5. resistance max 240 Q cable capacity max 65 pF m Outside diameter of the cable for T3419 P and T7411 connection must be from 3 to 6 5 mm Suitable cable is e g SYKFY 2x2x0 5 mm where one wire pair serves for device powering and the other pair for communication link For devices T3319L T3419L T7311L and T7411L use cable with respect to female connector parameters Do NOT connect shielding at connector side The cable should be led in one line i e NOT to tree or star Termination resistor should be located at the end For short distance other topology is allowed Terminate the network by a termination resistor The value of the resistor is recommended about 120 Q For short distance termination resistor can be left out The cable should not be led in parallel along power cabling Safety distance is up to 0 5 m otherwise undesirable induction of interference signals can appear Electrical system wiring may do only worker with required qualification by rules in operation The devices T3319P and T3419P are designed to measure pressured air It is good to mount probe directly into high pressure area i e air pressured pipe if it is possible There is other possibility to use flow chamber SH PP see Appendix C Before you remove probe of the transmitter TxxxxP make sure that the pressure in a pressure chamber duct pipe and the ambient pressure are in equilibrium TE SNC T33 4 19 T73 4 11 08 3 Dimensions T3319 P
6. 0 Accuracy 1 5 C 2 7 F at ambient temperature T lt 25 C 77 F and relative humidity RH gt 30 for more details see graphs below 100 T x x 80 aS E oO 2 60 g 1 5 C Tdp 40 2 5 C Tdp 20 5 0 C Tdp 0 20 0 20 40 60 80 100 120 process temperature T C TE SNC T33 4 19 T73 4 11 08 100 80 60 40 20 dew point remperature Tdp C 1 5 C Tdp H 2 5 C Tdp 5 0 C Tdp 0 C Tdp 20 0 20 40 60 80 100 120 process temperature T C 12 Absolute humidity Range 0 to 400 g m Accuracy 1 5g m at air temperature T lt 25 C 104 F for more details see graphs below accuracy g m 20 0 20 40 60 80 100 process temperature T C Specific humidity Accuracy 2 kg at air temperature T lt 35 C 95 F Range 0 to 550 g kg Mixing ratio Accuracy 2 kg at air temperature T lt 35 C 95 F Range 0 to 995 g kg Specific enthalpy Accuracy 3kJ kg at air temperature T lt 25 C 77 F Range 0 to 995 kJ kg The values computed from ambient temperature and relative humidity including their accuracy you can exactly determine by the program Conversions It is free to download at http www cometsystem cz dnload conversio
7. Programmable transmitter of temperature relative humidity and other derived humidity values T3319 T3319P T3419 T3419P Programmable transmitter of atmospheric pressure temperature relative humidity and other derived humidity values T7311 17411 with RS232 RS485 serial output and external probe Instruction Manual Instruction Manual Deire Temperature Humidity Pressure Compared Output Version type values T3319 v v E v RS232 probe with cable T3319P v v a v RS232 probe for compressed air T3419 v y 2 y RS485 probe with cable T3419P y v gt v RS4835 probe for compressed air T7311 v v v v RS232 probe with cable T7411 v v v v RS485 probe with cable The removable probe for compressed air measurement is noninterchangeable part of the device The protection of connector is IP67 Device is designed for measurement of ambient temperature at C or F relative humidity of air without aggressive ingredients Measured temperature and relative humidity are recomputed to humidity expression dew point temperature absolute humidity specific humidity mixing ratio and specific enthalpy Devices T7311 and T7411 support atmospheric pressure measurement at hPa PSI inHg mBar oz in mmHg inH2O and kPa too It is possible to set pressure correction for altitude offset Device setting is provided by user s software see latter Devices T3319 P and T7311 communicates via
8. e Receiver Input Resistance 96 KQ Devices on bus max 256 1 8 Unit Receiver Load Measuring parameters Ambient temperature RTD sensor Pt1000 3850ppm Measuring range 30 to 105 C 22 to 221 F Display resolution 0 1 C 0 2 F Accuracy 0 4 C 40 7 F Relative humidity reading is temperature compensated at entire temperature range Measuring range 0 to 100 RH see Device installation Display resolution 0 1 RH Accuracy 2 5 RH from 5 to 95 RH at 23 C 73 4 F Atmospheric pressure T7311 T7411 only Unit hPa mBar PSI mmHg inHg inH O oz in kPa Range 600 8 70 450 0 17 72 240 9 139 2 60 00 1100 15 95 825 1 32 48 441 6 255 3 110 00 accuracy T 23 C T 73 4 F 1 3 0 02 1 0 0 04 0 5 40 3 0 13 0 lt T lt 40 C 32 lt T lt 104 F 1 5 0 02 1 1 0 04 0 6 0 3 0 15 Else 2 0 0 03 1 5 0 06 0 8 0 5 0 20 TE SNC T33 4 19 T73 4 11 08 11 Measuring temperature and humidity range is limited in accordance with the graph below 100 4 oO fo 70 60 relative humidity relativn vlhkost 40 30 continuous use 50 oblast trval ho 20 50 60 70 80 90 temperature teplota C The value computed from air temperature and relative humidity Dew point temperature Range 60 to 80 C 76 to 176 F 100 11
9. esponse times to shorten the length of the sample tubes to a minimum few meters closing valve 2 allows access to the sample system without interrupting the main line closing valve 5 the sample flow is regulated by this valve Measurement accuracy is typically not affected by the sample flow rate but at low speeds increasing response time outlet tube 6 if the measured sample of air is released into the atmosphere select the length of the outlet tube of 1 5 m recommended for tube diameter 6mm The reason is to ensure the accuracy of the sample in the flow chamber and avoid back diffusion of moisture from the ambient air That basic structure of sampling system can be supplemented with filters coolers flow measurement pressure measurement etc For the accurate operation of sampling system is important to ensure perfect tightness of all connections and to use corrosion resistant materials Tube inclination is chosen so as to avoid the accumulation of fluid in the system Technical specification flow chamber SH PP Material of flow chamber stainless steel DIN 1 4301 Inlet and outlet connection G1 8 Probe connection G1 2 Sample flow rate 0 1 to 3 l min Operating pressure up to 25 bar Weight 580 g Note Screw coupling not included TE SNC T33 4 19 T73 4 11 08 16
10. ets to Olh and communication speed to 9600Bd after button press there is dEF message blinking at LCD display Six seconds later message dEF stays shown it means manufacturer setting of communication protocol is done Device sends two stop bits for receive one stop bit is enough IE SNC T33 4 19 T73 4 11 08 7 Modbus registers of the device Variable Unit cae E Se Format Size Status Measured temperature C F 0x0031 49 Int 10 BIN16 R Measured relative humidity 0x0032 50 Int 10 BIN16 R Computed value i 0x0033 51 Int 10 BIN16 R Address of device 0x2001 8193 Int BINI6 R W Code of communication speed 0x2002 8194 Int BINI6 R W Serial number of device Hi 0x 1035 4150 BCD BIN16 R Serial number of device Lo 0x 1036 4151 BCD BIN16 R Version of Firmware Hi 0x3001 12289 BCD BINI6 R Version of Firmware Lo 0x3002 12290 BCD BINI6 R Addition for devices T7311 and T7411 with atmospheric pressure measurement Variable Unit ae PS S Format Size Status hPa Int 10 PSI Int 1000 inHg Int 100 Atmospheric pressure mpa 0x0034 52 m T BIN16 R mmHg Int 10 inH O Int 10 kPa Int 100 Since FW version 02 44 there is possibility to read the all computed values from registers Variable Unit m e 3 J Format Size Stat
11. f communication channel where the measured value is mapped Command for value reading is AAx CRC cr where AA is device address x is number of communication channel CRC is check sum can be used or not Measured value Number of communication channel Temperature 0 Relative humidity 1 Computed value 2 Atmospheric pressure 3 Command AA CRC cr for reading all measured values at once is supported for multi channel devices since firmware version 02 60 Response gt temperature relative humidity dew point temperature absolute humidity specific humidity mixing ratio specific enthalpy atmospheric pressure cr ARION communication protocol AMiT company The device supports communication protocol ARiON version 1 00 For more details see file Description of communication protocols of Txxxx series or www amit cz Communication with HWg Poseidon units Device supports communication with HWg Poseidon units For communication with this unit set the device with setup software TSensor to communication protocol HWg Poseidon and set correct device address This communication protocol supports read temperature at C relative humidity one of computed value dew point temperature or absolute humidity and barometric IE SNC T33 4 19 T73 4 11 08 9 pressure at kPa depended by device type For atmospheric pressure correction to altitude setting there is Users software Tsensor Jumper and button If commu
12. he device is displayed on LCD display at decimal base for HWsg Poseidon s communication protocol there is shown number corresponding with ASCII address code Next press of button exits info mode and actual measured values are displayed Note No measurement and communication is possible during info mode If device stays in info mode for longer than 15 s device automatically returns to measuring cycle TE SNC T33 4 19 T73 4 11 08 6 Setting of pressure correction for altitude For devices T7311 and T7411 only If there is necessary to read value of atmospheric pressure corrected with respect to altitude it is possible to set corresponding pressure offset for this altitude It is possible to do it with Users software This value is then automatically added to measured pressure value The resultant value of pressure with added correction for altitude must be between 300 hPa and 1350 hPa from 4 351 PSI to 19 580 PSI Outside this range device sends value of Error 2 Description of communication protocols Detailed description of each communication protocols including examples of communication is available in individual document Description of communication protocols of Txxxx series which is free to download at www cometsystem cz Note After switching ON the power of the device it can last up to 2 s before the device starts to communicate and measure Modbus RTU Control units communicate on master slave principle in half duplex operati
13. id phase stays inside sensor s cover and can t escape from the cover easily It can dramatically increase response time to relative humidity change If water condensation occurs for longer time it can cause sensor damage Similar effect can occur under water aerosol conditions Don t connect device while power supply voltage is on Interconnection terminals for T3319 P T3419 P T7311 and T7411 devices are accessible after unscrewing four screws and removing the lid Measuring temperature relative humidity and eventually pressure sensors are non removable device parts Lace the cable through a gland at the case wall Connect the cable to terminals with respecting the signal polarity see figure Terminals are self clamping and can be opened by a suitable screwdriver For the opening insert the screwdriver to smaller terminal hole and lever by him Do not forget to tighten glands and case lid with inserted packing after cables connecting It is necessary for warranting of protection IP65 Connect complementary female connector for T3319L T3419L T7311L and T7411L transmitters in accordance with the table in Appendix B of this manual Devices T3319 P and T7311 are supplied with connection cable equipped with connector for connection to RS232 interface For devices with RS485 output there is recommended to use shielded twisted copper cable maximal length 1200m The cable must be located at indoor rooms Nominal cable impedance should be 100 Q loop
14. ing temperature range case with electronics 30 to 80 C 22 to 176 F external probe with cable 30 to 105 C 22 to 221 F It is recommended to switch off the LCD display at ambient temperature above 70 C 158 F around electronics Operating relative humidity range 0 to 100 RH Operating pressure range of probe T3319P T3419P up to 25 bar Air flow velocity T3319P T3419P probe up to 25 m s at a pressure of 1 bar 1m s at a pressure of 25 bar Outer influence in accordance with Czech National Standard 33 2000 3 normal environment with those specifications AE1 AN1 ARI BEI Working position negligible see device installation Electromagnetic compatibility complies EN 61326 1 Not allowed manipulation It is not allowed to operate the device under conditions other than specified in technical parameters Devices are not designed for locations with chemically aggressive environment Temperature and humidity sensors must not be exposed to direct contact with water or other liquids It is not allowed to remove the sensor cover to avoid any mechanical damage of the sensors Do not use the device in an explosive environment Mechanical connection of probe T3319P T3419P G1 2 with O ring Storing conditions temperature 30 to 80 C 22 to 176 F humidity 0 to 100 RH without condensation Dimensions see dimensional drawings Weight approximately T3319 1m probe 290g T3319 2m probe 330g T3319 4m probe 410g T3319P 1m probe
15. link RS232 without galvanic isolation devices T3419 P and T7411 via galvanic isolated link RS485 Supported communication protocols are Modbus RTU protocol compatible with standard Advantech ADAM ARION and communication with HWg Poseidon devices Devices are preset from manufacturer to Modbus RTU communication protocol If you would like to use different communication protocol then Modbus RTU it is necessary preset them through user s software see latter Temperature relative humidity eventually pressure sensors are non removable device parts excepting T3319P and T3419P transmitters pressure sensor is placed inside the electronic case Measured and computed values are optionally shown on dual line LCD display If there are two values displayed at one LCD line they are periodically switched between both readings with period of 4 seconds Display can be switched OFF totally too Use user s software Tsensor for setting of all device parameters recommended It is free to download at http www cometsystem cz english download transmitters htm It supports make the adjustment of the device too This procedure is described at file Calibration manual pdf which is installed commonly with the software Change of some parameters is possible to do without user s software with Windows hyperterminal change of communication protocol its parameters LCD display setting It is described in file Description of communication protocols of Tx
16. nication with HWg Poseidon unit is selected the function of jumper and button is as follows e Jumper opened and button shortly pressed device goes to Info mode see chapter Info mode e Jumper closed and button pressed for longer than six seconds causes restoring of manufacturer setting of communication protocol i e sets Modbus RTU communication protocol device address sets to 01h and communication speed to 9600Bd after button press there is dEF message blinking at LCD display Six seconds later message dEF stays shown it means manufacturer setting of communication protocol is done Error States of the device Device continuously checks its state during operation In case error is found LCD displays corresponding error code Error 0 first line displays Err0 Check sum error of stored setting inside device s memory This error appears if incorrect writing procedure to device s memory occurred or if damage of calibration data appeared At this state device does not measure and calculate values It is a serious error contact distributor of the device to fix Error 1 measured or calculated value except in pressure is over upper limit of allowed full scale range There is a reading Errl on LCD display Value read from the device is 999 9 for pressure reading there is 999 9 hPa correct value This state appears in case of e Measured temperature is higher than approximately 600 C i e high non
17. ns exe Response time with stainless steel mesh sensor cover F5200B and bronze sensor cover F0000 selectable option air flow approximately 1 m s temperature 1T3319 L T3419 L T7311 L T7411 L t90 lt 6 min temperature step 20 C 36 F T3319P T3419P t90 lt 16 min temperature step 20 C 36 F relative humidity t90 lt 30 s humidity step 65 RH constant temperature atmospheric press t90 lt 44s Recommended calibration interval year This value depends on the barometric pressure If device doesn t support pressure measurement then constant value stored inside device memory is used Default value preset by manufacturer is 1013hPa and can be changed by user s software This maximum is reached under conditions about 70 C 100 RH or 80 C 70 RH 4 There is possible to change response time For more details see file Description of calibration and adjustment procedure pdf which is installed together with Users software TE SNC T33 4 19 T73 4 11 08 13 Measuring interval and LCD display refresh 0 5 s atmospheric pressure 2 s Power 9 to 30 V dc Consumption T3319 T7311 RS232 6mA T3419 T7411 RS485 max 0 5 W Protection T3319 L P T3419 L P electronics IP65 sensors are located in cover with IP40 protection T7311 L T7411 L electronics IP54 sensors are located in cover with IP40 protection Filtering ability of the sensor cover 0 025 mm Operating conditions Operat
18. on Only master can send request and only addressed device responds During sending of request no other slave station should respond During communication data transfer proceeds in binary format Each Byte is sent as eight bit data word in format 1 start bit data word 8 bit LSB first 2 stop bits without parity Device supports communication speed from 110Bd to 115200Bd Sent request and response have syntax ADDRESS OF DEVICE FUNCTION Modbus CRC Supported functions 03 0x03 Reading of 16 bit registers Read Holding Registers 04 0x04 Reading of 16 bit input gates Read Input Registers 16 0x10 Setting of more 16 bit registers Write Multiple Registers Jumper and button Jumper and button are located next to connection terminals If communication protocol Modbus is selected the function of jumper and button is as follows e Jumper opened device memory is protected from writing from the device side it is only enabled to read measured value writing to memory is disabled no change of device address communication speed and LCD setting is enabled Jumper closed writing to device memory is enabled by means of User s software Jumper opened and button shortly pressed device goes to Info mode see chapter Info mode e Jumper closed and button pressed for longer than six seconds causes restoring of manufacturer setting of communication protocol i e sets Modbus RTU communication protocol device address s
19. or marked RS232 connect directly to the PC Power voltage 6V DC from an external acdc adapter connect to pin 9 of connector marked RS485 OV connect to pin 5 and link RS485 connect across pin 3 A and pin 4 B Time out setting is performed by connecting the corresponding pins of connector marked RS485 for more information see the operation manual for ELO E06D Appendix B Female Transmitter Transmitter Transmitter Transmitter Pamoa Tx1xxL Tx2xxL Tx3xxL Tx4xxL a 9 with 4 20mA with 0 10V with RS232 with RS485 connectar outputs outputs output output 1 11 Udd Uout1 2 3 Uout2 4 GND IE SNC T33 4 19 T73 4 11 08 15 Appendix C The probe for measuring the moisture of compressed air should be placed directly on the pressure pipelines to achieve higher measurement accuracy and fast response times But they are cases where such placement is not possible The reason is the high air speed high temperature high pollution small diameter pipes etc Such situation can be solved by placing the probe into the flow measuring chamber The picture shows the basic layout of the sampling system with chamber SH PP Sampling closing valve probe flow chamber SH PP closing valve outlet tube 6 sampling 1 end of the tube placed in the centre of pressure pipelines distribution of moisture in the pipe cross section is not homogeneous To achieve fast r
20. us Dew point temperature C F 0x0035 53 Int 10 BIN16 R Absolute humidity g m 0x0036 54 Int 10 BINI6 R Specific humidity g kg 0x0037 55 Int 10 BIN16 R Mixing ratio g kg 0x0038 56 Int 10 BIN16 R Specific enthalpy kJ kg 0x0039 57 Int 10 BIN16 R Explanation e depends on device setting by User s software Ww Int 10 register is in format integer 10 R register is designed only for reading register is designed for writing for details see file Description of communication protocols of Txxxx series register addresses are indexed from zero register 0x31 is physically sent as value 0x30 0x32 as 0x31 zero based addressing Note In case there is a need for reading of measured values from the device with higher resolution than one decimal measured values in device are stored also in Float format which is not directly compatible with IEEE754 Protocol compatible with Advantech ADAM standard Control units communicate on master slave principle in half duplex operation Only master can send requests and only addressed device responds During sending request any of slave devices TE SNC T33 4 19 T73 4 11 08 8 should respond During communication data is transferred in ASCII format in characters Each Byte is sent as two ASCII characters Device supports communication speed from 1200Bd to 115200Bd parameters of communication link are 1 start bit eight bit data word LSB first 1 stop bit
21. without parity Jumper Jumper is located next to connection terminals If communication protocol compatible with standard Advantech ADAM is selected its function is the following e If jumper during switching ON the power is closed device always communicates with following parameters regardless stored setting in the device communication speed 9600 Bd without check sum device address 00h e If jumper during switching ON the power is not closed device communicates in accordance with stored setting e If jumper is closed during device operation device temporarily changes its address to OOh it will communicate in the same communication speed as before closing jumper and will communicate without check sum After jumper is opened setting of address and check sum is reset in accordance with values stored in the device e Communication speed and check sum are possible to change only if jumper is closed e Jumper closed and button pressed for longer than six seconds causes restoring of manufacturer setting of communication protocol i e sets Modbus RTU communication protocol device address sets to 01h and communication speed to 9600Bd after button press there is dEF message blinking at LCD display Six seconds later message dEF stays shown it means manufacturer setting of communication protocol is done For communication with device which measure more than one value there is necessary to add at the end of command the number o
22. xxx series which is free to download at the same address Transmitter version TxxxxL with watertight male connector instead of a cable gland RS232 or glands RS485 is designed for easy connection disconnection of communication cable Male Lumberg connector RSFM4 has protection IP67 Transmitter version TxxxxP is designed for compressed air measurement up to 25 bars Models marked TxxxxZ are non standard versions of the transmitters Description is not included in this manual Please read instruction manual before the first device connection Device setting from the manufacturer If special setting was not required in the order the device is set from the manufacturer to the following parameters IE SNC T33 4 19 T73 4 11 08 2 communication protocol Modbus RTU device address 01 communication speed 9600Bd without parity 2 stop bits display switched ON value displayed at higher line temperature temperature pressure by device type value displayed at lower line relative humidity only temperature unit C pressure unit hPa preset computed value dew point temperature correction for altitude 0 hPa absolute pressure Device installation Device is designed for wall mounting There are two mounting holes at the sides of the case It is NOT recommended to use the device for long time under condensation conditions It could be the cause of water steam condensation inside the sensor s cover into water phase This liqu
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