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LB-524 Thermometer & Hygrometer with Wireless GSM Communication, Recorder


The LB-524 GSM temperature and humidity recorder is designed to control and document the course of technological processes, in warehouses and transport, in the pharmaceutical, medical and food industries. It is useful when meeting the requirements of ISO and HACCP quality control. It can be used to control temperature and humidity in distribution centers, cultivation rooms, vehicles, parcels sent, etc.

  • Air temperature, resolution 0.1°C, uncertainty 0.2°C
  • Air relative humidity, resolution 0.1%, uncertainty 2.0%
  • Atmospheric pressure (option), resolution 0.1hPa
  • Light radiation (option)
  • Up to 4 external temperature probes (option)
  • Memory up to 30000 records
  • GSM/GPRS Wireless
  • USB
  • LBX Data server for PC
  • 4xAA (1.5V or 1.2V)
  • 9V DC power supply
Operating range
  • -20°C .. +60°C
  • ABS, IP30, 102x102x43mm

Each wireless thermohygrometer (thermometer), as per order, may feature an individual calibration certificate provided by LAB-EL Calibration Laboratory.

  • thermohygrometer
  • hytherograph
  • wireless GSM/GPRS communication
  • measurement, recording (optionally):
  • functions (optionally):
    • thermometer,
    • hygrometer,
    • light meter,
    • barometer,
    • recorder (thermograph, hygrograph, barograph)
  • USB interface for configuration
  • compatibility with universal SCADA LBX software 
  • small, robust instrument
  • wide operating temperature range
  • housing protection class: IP30
  • battery or externally powered
  • easily replaceable batteries or rechargeable batteries
  • exemplary practical applications

Description of the GSM wireless temperature and humidity recorder

The LB-524 GSM is a battery-powered recorder of air temperature and relative humidity, air pressure and light intensity. According to a programmed time interval, the recorder turns on the GSM/GPRS module and initiates communication with the LBX server with a pre-set IP address. The device is powered by easily exchangeable AA batteries (4x1.5 V) or via an external power unit. When the primary power source fails, the GSM operation is halted, but measuring and recording continue thanks to an integrated rechargeable long-lasting lithium battery. The measurement results and additional information are displayed continuously on an LCD display.

The LB-524 GSM hytherograph may perform various measurements, depending from the optional realization, according to the requirements of the ordering party:

  • temperature measurement (Pt-1000 RTD probe, sensor built into the housing or the external probe on a cable);
  • measurement of up to four temperatures with external measuring probes (the LB-524TX4 version);
  • relative air humidity measurement (hygrometer, sensor built-in inside the housing);
  • light intensity measurement in the range of visible light (luxmeter, sensor built-in inside the housing);
  • atmospheric pressure measurement (barometer, sensor built-in inside the housing).

Control of exceeding the alarm thresholds by the GSM wireless temperature and humidity recorder

Every measured value may be assigned with a lower and upper alarm threshold. When the measurement exceeds this range, an alarms is triggered. When the alarm threshold is exceeded, parameter measurements are carried out in 1-minute intervals, irrespective of the set measurement and recording times.

An additional feature of the alarm delay function enables the alarm to be triggered when the threshold is exceeded continuously beyond the set delay time.

The alarm may also be triggered by switching off the external power supply of the GSM LB-524 recorder, which can be used to signal mains power supply failure to the monitored devices (e.g.: refrigerators).

An alarm triggers additional reporting from the LB-524 recorder to the server working under supervision of the SCADA LBX software (irrespective of the time interval for data transmission). The alarm may also trigger text messages with information about the alarm to a maximum of 4 pre-programmed mobile phones.

Data transmission via GSM module of the wireless temperature and humidity recorder

In a typical application the recorder carries out measurements and records results in the memory over a set interval (ranging from 1 minute to 4 hours). Over a set interval the recorder turns on the GSM interface and transmits current and memory-stored measurement results onto a set permanent public IP address of a computer with SCADA LBX software.

In the absence of a permanent IP address, it is possible to use an additional Proxy LBX server. In particular, the customers using LB-524 recorders may employ a Proxy server shared by LAB-EL. This server provides a proxy service between LB-524 recorders and any customer’s computer with access to the Internet, but without a public IP address.

The registration specifications and IP address of the LBX server to which the recorder should connect must be set during the device configuration. The configuration is performed via USB interface.

Measurement memory of the GSM wireless temperature and humidity recorder

The GSM LB-524 recorder is equipped with a large memory for storage of approx. 30,000 individual measurement results. For example: for the thermometer function only, with recordings set at 20-minute intervals, this is sufficient for over a year of recordings in one recording session. The data are stored in the memory and “overwritten”, which means that when the memory is full, the oldest recordings are deleted.

In the case of lack GSM communication, the measurements are independently recorded in the LB-524 recorder memory, and after re-establishing a connection, the outstanding results are transmitted from the recorder’s memory to the data base of the SCADA LBX software that monitors the functioning of the LB-524 GSM recorder.

The LBX software makes it possible to work with many LB-524 GSM recorders concurrently.

Calibration certificate issued by an accredited laboratory for the GSM wireless temperature and humidity recorder

Every wireless thermohygrometer (thermometer, hygrometer), barometer, as per order, may feature an individual calibration certificate provided by the LAB-EL Calibration Laboratory.

Application of the GSM wireless temperature recorder and …

The LB-524 GSM temperature and humidity recorder is designed for controlling and documenting the course of technological processes in production facilities, warehouses and transportation — especially in pharmaceutical, medical and food industries. It is especially useful in meeting the requirements for ISO and HACCP production quality control. It may be used to control the temperature and humidity in distribution centres, growing cellars, vehicles, shipped packages, etc. The wireless four-channel temperature and humidity recorder supporting GSM transmission may perform temperature and humidity monitoring inside packages containing medicine, vaccines, food articles and other commodities subject to temperature and humidity during their transport via different means of transportation, overland, by sea or air. Even if over a certain period of time there is no connection to the GSM network, after re-establishment of the network connection, the recorder will send all the overdue measurement results to the database served by the LBX software, and so no data will be lost.

Technical Data

 Temperature measurement uncertainty  ±0.2°C   ±1 final digit, within the range of 0… +50°C 
 ±0.6°C   ±1 final digit, within the range of -30… +50°C 
 ±1.2°C  ±1 final digit, within the range of -100…+200°C
 ±2.4°C  ±1 final digit, within the range of -200…+550°C
 Measurement range  -20…+60°C  with an external temperature sensor
 -100…+200°C  with an external temperature sensor, for LB-524TX or LB-524TX4
 -200…+550°C  with an external temperature sensor, for LB-524TXE or LB-524TXE4 (*1)
 Measurement resolution 0.1°C  
 Humidity measurement uncertainty of LB-524  ±2.0%  within the range of 10…90% ±1 final digit
 ±4.0%  outside the range of 10…90%
 Humidity measurement range of LB-524  10…95%  for temperatures up to +40°C
 10…60%  for temperatures up to +70°C
 10…40%  for temperatures up to +85°C
 Humidity measurement range of LB-524H  0…100%  for temperatures up to +60°C
 0…70%  for temperatures up to +70°C
 0…40%  for temperatures up to +85°C
Measurement resolution  0.1%  
 Spectral range - visible light
- UV range (optionally)
 Measurement range  0–180 kilo-lux  
 Measurement range  500–1,100 hPa  
 Measurement resolution  0.1 hPa  
 Memory capacity  30,000 entries  of individual results of a single measurement
 GSM interface  900 MHz and 1,800 MHz  
 Power source  4 x 1.5 V AA batteries  AA alkaline batteries
 4 x 1.2 V AA rechargeable batteries  recommended Ni-MH Eneloop HR-3UTGB Sanyo or BK-3MMC Panasonic rechargeable batteries
 9… 12 V / DC  optional external power supply source
Power consumption  1 mA  average (measurement and recording)
 500 mA  maximum (active GSM transmission)
 Battery operation time  This time is not unequivocally defined. It depends on many parameters, among others: from the set interval for establishing communication via GSM, GSM network signal quality and the set interval between measurements. For typical working conditions of the GSM network signal, an operation temperature of 20°C, dedicated Eneloop rechargeable batteries fully charged, with the following settings:
- GSM connection interval: 30 minutes;
- measurement and recording every 10 minutes;
the operation time of the batteries is 1–2 months.
  Dimensions  102 x 102 x 43 mm  dimensions without external antenna
 Material, housing protection class  ABS  IP 30
 Operating temperature range  -20…+60°C  


Per special order, there are realizations of any chosen set of the above mentioned measured values possible.

Remark (*1): The given measurement range may be additionally limited by the parameters of the external sensor used.
Remark (*2): The battery is not subject to warranty.

Optional equipment (per order)

  • External 9 V power unit for powering from mains of 230 V/AC (note: the rechargeable batteries are not charged inside the LB-524; the rechargeable batteries should be charged after removing from the device and with the use of an external charger).
  • USB A-micro cable, type B.
  • Ni-MH Eneloop HR-3UTGB Sanyo or BK-3MCC Panasonic rechargeable batteries.
  • Eneloop NC-MQN09W charger for rechargeable batteries.
  • Wall-mounted LB-528B plastic holder for the LB-524 thermo hygrometer.
See also
See also
Thermometer LB-524T4Thermometer LB-524T4
Battery supplied thermometer and recorder of four temperatures measured by Pt1000 external temperature sensors.