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Comet T3319P Instruction Manual

Programmable transmitter of temperature, relative humidity and other derived humidity values, programmable transmitter of atmospheric pressure, temperature, relative humidity and other derived humidity values with rs232 / rs485 serial output and external
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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, T7411
with RS232 / RS485 serial output
and external probe
Instruction Manual
March 2025

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Summary of Contents for Comet T3319P

  • Page 1 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, T7411 with RS232 / RS485 serial output and external probe Instruction Manual...
  • Page 2 It is prohibited to copy and make any changes in this manual, without explicit agreement of company COMET SYSTEM, Ltd. All rights reserved. COMET SYSTEM, Ltd. makes constant development and improvement of their products. Manufacturer reserves the right to make technical changes to the device without previous notice. Misprints reserved.
  • Page 3 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.

  • Page 4: Device Setting From The Manufacturer

    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.
  • Page 5 Dimensions – T3319(P), T7311 transmitter with RS232 serial output probe for compressed air measurement Typical application wiring of T3319(P) and T7311 power from communication port power from external voltage source IE-SNC-T33(4)19+T73(4)11-11...
  • Page 6 Dimensions – T3419(P), T7411 transmitter with RS485 serial output probe for compressed air measurement Typical application wiring of T3419(P), T7411, connection of terminals IE-SNC-T33(4)19+T73(4)11-11...
  • Page 7 Dimensions – T3319L, T3419L, T7311L, T7411L Connection: see Appendix B 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.

  • Page 8: Description Of Communication Protocols

    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.
  • Page 9 Modbus registers of the device Address Address Variable Unit Format Size Status [hex] [dec] [°C] [°F]* Measured temperature 0x0031 Int*10 BIN16 Measured relative humidity 0x0032 Int*10 BIN16 Computed value 0x0033 Int*10 BIN16 Address of device 0x2001 8193 BIN16 R/W* Code of communication speed 0x2002 8194 BIN16...
  • Page 10 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, without parity.

  • Page 11: Error States Of The Device

    pressure at kPa (depended by device type). For atmospheric pressure correction to altitude setting there is Users software Tsensor. Jumper and button If communication with HWg Poseidon unit is selected, the function of jumper and button is as follows: • Jumper opened and button shortly pressed – device goes to Info mode, see chapter „Info mode“.

  • Page 12: Readings On Lcd Display

    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.
  • Page 13 Measuring temperature and humidity range is limited in accordance with the graph below! The value computed from air temperature and relative humidity: Dew point temperature -60 to +80 °C (-76 to 176 °F) Range: ±1.5 °C (±2,7 °F) at ambient temperature T < 25°C (77°F) and relative Accuracy: humidity RH >30%, for more details see graphs below IE-SNC-T33(4)19+T73(4)11-11...
  • Page 14 T3319(L), T3419(L), T7311(L), T7411(L) t90 < 6 min (temperature step 20 °C (36 °F) ) T3319P, T3419P t90 < 16 min (temperature step 20 °C (36 °F) ) relative humidity: t90 < 30 s (humidity step 65 %RH, constant temperature) atmospheric press.

  • Page 15: End Of Operation

    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)
  • Page 16 Appendix A Connection of transmitters with RS485 output to the PC To connect a transmitter with an RS485 interface to a computer, you can use a suitable commercially available converter. Connect the converter according to the converter's manual. In case of communication problems, check whether it is necessary to configure the resistor connections for defining the idle state, the termination resistor or the time delay.
  • Page 17 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.

This manual is also suitable for:

T3319T3419T3419pT7311T7411T3319-2 ... Show all

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