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Laboratory Electronics

Precision Thermometer -200…+850°C with a resolution of up to 0.001°C — LB-499-PT

  •   Pt100 (Pt1000) thermoresistors acting as temperature sensors
  •   3/6 measuring channels (after integration in LB-480/LB-490)
  •   Memory of calibration factors stored inside the probe plug
  •   High resolution (0.001°C, 0.001 Ω)
  •   Measurement uncertainty up to ±0.02°C
  •   Internal auto-calibration circuits
  •   Ease of use
  •   Case made of robust materials
  •   LBX software compatibility
  •   Display
  •   Customised Callendar-Van Dusen factors may be inputted
  •   GSM, Ethernet, and USB interfaces (after integration in LB-480/LB-490)
lb499-pt-02.s.jpgPrecision Thermometer -200…+850°C with a resolution of up to 0.001°C

Precision Thermometer Intended Use

precyzyjny-termometr-lb480-lb499pt-2.jpg

The LB-499-PT is a module of a precision single-channel thermometer enabling temperature measurements within the range of -200…+850°C, with a measurement resolution of 0.01°C or 0.001°C. Practical measurement range will be additionally limited by the working temperature range, provided in the specifications of the external temperature sensor used.

In order to operate correctly, the LB-499-PT module must be integrated with one of the following devices:

  • LB-480 — data recorder (1–3 individual modules),
  • LB-490 — data recorder/weather station (1–6 individual modules).

 

The LB-499-PT module of the precision single-channel thermometer uses Pt100 or Pt1000 platinum thermoresistor as an external sensor protected by an appropriate sensor case (different execution options available). The module automatically recalculates resistance measurement results to temperature using Callendar-Van Dusen equation factors, according to PN-EN 60751 standard: Platinum sensors of industrial resistance thermometers and platinum temperature sensors.

In order to facilitate ease of use and avoid errors, when a probe with a thermometer resistor affixed to the LB-499-PT module of the precision single-channel thermometer is exchanged, the module reads calibration factors from permanent storage located in the measurement probe plug.

The calibration of the LB-499-PT module of the precision single-channel thermometer is performed by calibrating its measurement system with a known precision reference resistor (e.g. 100.000 Ω) and by entering the sensor calibration coefficients provided by the manufacturer or measured in a calibration laboratory. For standard calibration, the factors amount to:

  • R0 = 100.000 Ω
  • A  = 3.908 x 10^-3
  • B  = -5.775 x 10^-7
  • C  = -4.183 x 10^-12

Precision Thermometer 0.001°C — LB-480 with LB-499-PT modules The LB-499-PT module of the precision single-channel thermometer utilises a DB-9 female connection for connecting a four-wire external sensor and connecting the EEPROM with the sensor’s calibration data. All the module’s inputs are galvanically insulated and protected against overcharging — this, however, does not annul the obligation to follow the ESD protection principles.

In the LB-480 data recorder 1–3 LB-499-PT modules of the precision single-channel thermometer may be installed concurrently, thus creating a 1-, 2- or 3-channel precision thermometer. In the LB-490 data recorder 1–6 LB-499-PT modules of the precision single-channel thermometer may be installed concurrently, thus creating a 1- to 6-channel precision thermometer.

Precision Thermometer 0.001°C — LB-480 with LB-499-PT modulesThe results of the measured resistance and calculated temperature are stored in the memory of the LB-480 recorder or LB-490 recorder with a maximum frequency of 1 sps. The results may be averaged within a period of 1–10 seconds. The measurement results may be sent from the thermometer to external systems with the help of all the functionalities available in the LB-480 recorder or the LB-490 recorder (Ethernet, USB, GSM). The thermometer is compatible with SCADA LBX software, which enables archiving, visualising and signalling if the set values for measurement results are exceeded.

The external temperature sensor should be connected by means of a screened four-wire lead and with a screening lead connected to the sensor’s metal case, and properly connected in the LB-499-DB sensor’s plug, which eliminates any unfavourable electromagnetic interference with the measurement result. In order to take measures over a wide temperature range, or with extreme precision, special execution sensors have been designed with an appropriately long screen that eliminates temperature influence with the connection lead; they also feature a precision Pt100 wire thermoresistor — for example, the following sensors: TA-PL-100D, TA-PY-100D or TB-PL-100D (plus, the sensor’s screen dimensions, e.g.: 6x450). Other executions of the temperature measurement module sensors are possible after establishing the technical requirements.

Exemplary designation of a complete sensor for LB-499-PT inserts: LB-499-DB/TA-PL-100D-6x450.

Practical Applications of the Precision Thermometer

Applications of the LB-499-PT module of precision single-channel thermometer include:

  • laboratory temperature measurements,
  • thermometer calibration,
  • thermostat operation control,
  • automatics and remote measurement systems.

Technical Specifications of the Precision Thermometer

 

Temperature measurement resolution  Mode 1:  0.001°C, noise <±1 mK (averaging: 10 s)
  Mode 2:  0.01°C, noise <±3 mK (averaging: 10 s)
Range of measured temperatures  -200°C … +850°C,
additionally limited by the working temperature range of the external sensor
Range of measured resistances  0.000 Ω … 1,000.000 Ω
  0.00 Ω … 10,000.00 Ω*
Temperature measurement uncertainty  ≤0.02°C in the range of 0°C … 100°C (averaging: 10 s)
 ±0.0004*(T-50°C) outside the range (additionally limited by the class of the external temperature sensor used, averaging: 10 s)
Measurement current  1 mA ±3% for Pt100 sensors
  0.1 mA ±3% for Pt1000 sensors*
Input connection  DB9F
Input power  0.6 W (maximum)
Temperature range  storage: -10°C … +60°C
usage: 10°C … 40°C, no condensation


Remarks:
* The choice of Pt100 or Pt1000 sensor is possible at the stage of manufacturing a particular module. For better long-term stability it is recommended to use the Pt100 wire resistor sensor. The sensor should be connected by means of a screened four-wire lead with a screening lead connected to the sensor’s metal case, and properly connected with the sensor’s plug.

See also
See also
LB-480 LB-480
Termometr internetowy - rejestrator danych z interfejsem Ethernet i GSM/GPRS. Karta pamięci. 8 wejść: cyfrowe S300 lub analogowe (napięciowe, binarne, termistorowe, Pt1000). Wkładki dodatkowych opcji: RS-232, RS-485, USB. Obsługa dowolnego czujnika z interfejsem S300. Obsługa protokołów: IPv4, IPv6, HTML, JSON, XML, SNMP, MODBUS/TCP. Samodzielna sygnalizacja alarmów przez SMS-y, e-maile i przekaźniki. Oprogramowanie SCADA LBX.
LB-490 LB-490
Rejestrator danych z interfejsem Ethernet, USB i GSM/GPRS. Karta pamięci. 16 wejść: cyfrowe S300 lub analogowe (napięciowe, binarne, termistorowe, Pt1000). Moduły dodatkowych opcji: RS-232, RS-485. Obsługa dowolnego czujnika z interfejsem S300. Obsługa protokołów: IPv4, IPv6, HTML, JSON, XML, SNMP, MODBUS/TCP. Samodzielna sygnalizacja alarmów przez SMS-y, e-maile i przekaźniki. Oprogramowanie SCADA LBX.
Sensor Temp Sensor Temp
Termometry z zewnętrznymi sondami są wyposażane w zewnętrzne cyfrowe czujniki o różnej konstrukcji, stosownie do miejsca pomiaru, rodzaju mierzonego medium oraz zakresu mierzonej temperatury. Obudowy czujników chronią precyzyjne termorezystory Pt1000, Pt100 lub termistorem 10k przed uszkodzeniem. Czujniki są wykonywane na indywidualne zamówienie, w różnych rozmiarach, z przewodami o różnej długości.
Tolerancje Tolerancje
Norma PN-EN 60751, oprócz zależności pomiędzy temperaturą a wynikającą z niej rezystancją, podaje także tolerancje pomiaru temperatury w zależności od konstrukcji mechanicznej i precyzji wykonania rezystora termometrycznego, tak zwanej klasy tolerancji. Na dokładność pomiaru temperatury wpływają także: histereza i efekt starzenia rezystorów termometrycznych.
Ocena produktu
LB-499-PT
LB-499-PT jest modułem precyzyjnego jednokanałowego termometru na zakres -200...+850°C z rozdzielczością do 0,001°C, do wbudowania w LB-480 lub LB-490
Ocena: 5/5, liczba głosów: 14
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