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Laboratory Electronics

THERMOMETER - HYGROMETER LB-710NL (LB-710/NLH/NLM)


  • functions: thermometer, hygrometer (humidity meter)
  • measurement: temperature, air relative humidity
  • wide scope of work temperatures
  • interface LonWorks (EIA485-39kbps)
  • in accordance with sensor profile T/RH LonMark
  • small size
Termometr higrometr LB-710NL LonWorks

DESCRIPTION

Thermometer – hygrometer LB-710NL is designed for air temperature and relative humidity measurement in closed places (museums, warehouses, archives, laboratories). It is a stationary device, of small size, powered from an outside power supply.

For measurement the device uses data from the temperature sensor Pt-1000 as well as from the capacitive relative humidity sensor. Basing on the knowledge of nonlinear sensor characteristics and digital calibration data stored during the calibration process in a device's memory - the microprocessor (built-in the device) counts the actual relative humidity and temperature measurement results. Those results are sent (in a digital form) from the device to a supervisory system of data collection.

The device is equipped with a digital interface working in LonWorks standard with a transceiver EIA485-39kbps (it is possible to make the device with a different transceiver). The network variables and configuration parameters are in accordance with 'LonMark Functional Profile: Temperature Sensor' and 'LonMark Functional Profile: Relative Humidity Sensor'. Especially there are: temperature output type SNTV_temp_p, humidity output type SNTV_lev_percent, configuration parameters for each value that define the maximum and minimum output variables refreshing time, parameter 'send on delta' and parameter 'offset'. There is also a special communication mode used for connecting a sensor in a measurement system with a concentrator LB-732 that is based on private messages.

The device's interface allows on creating a measurement network, which consists of two pairs of cables (one powering pair and another communication pair) that enclose up to 63 knots (i.e. sensors).

The device does not have any mechanical calibration elements (i.e.: potentiometers). The calibration of the device is performed by sending calibration data obtained in the model climate conditions through a digital interface to the non-volatile memory of device. It guarantees comfort and high calibration accuracy as well as stability of the device's meteorological parameters in time.

Each thermometer - hygrometer (upon a request) can have an individual calibration certificate issued by the LAB-EL Calibration Laboratory .

Each thermometer - hygrometer LB-710 has a certification of type RP T 95 77 issued by the President of Central Measurement Office in Warsaw.

Technical data

TEMPERATURE MEASUREMENT
Measurement inaccuracy
+/- 0.2 °C, +/- 1 last digit
Scope of measurement 0 .. 85 °C version LB-710NL
-40 .. 85 °C version LB-710NLM
HUMIDITY MEASUREMENT
Measurement inaccuracy
+/- 2.0% in the scope of 10...90%, +/- 1 last digit
+/- 4.0% outside of the scope 10...90%
Scope of measurement LB-710NL 10..95% for temperatures up to +40°C
10..60% for temperatures up to +70°C
Scope of measurement LB-710NLH 0..100% for temperatures up to +60°C
0..70% for temperatures up to +70°C
MEASUREMENT READINGS
Parameter Scope of readings Resolution
Air temperature -40.0..+85.0°C 0.01°C (SNVT_temp_p
Relative humidity 0.0..100.0% 0.005% (SNVT_lev_percent)
RECOMMENDED CONSTANT WORK CONDITIONS *)
Scope of temperatures
0..40°C
Scope of humidity 20..80%
Level of environment corrosion aggressiveness accord. PN-71/H-04651 B
*) Going beyond recommended constant work conditions (i.e. when installing the device in the open space) requires using additional protection means for the device's electronic part so that water out dropping does not start inside of the device (protecting the electronics with silicone or using additional external casing).
POWER SUPPLY
Scope of voltage 6..30 V DC
Energy consumption 13 mA

OVERALL DIMENSIONS

Casing type L: approx. 70 x 70 x 22 mm.

EXTENDED VERSIONS

The following versions are available upon a special order:
  • LB-710NLM - with extended scope of work temperatures and measurement to: -40...+85°C,
  • LB-710NLH - with extended compared to standard, scope of constant humidity measurement to: 0...100%,
  • LB-710TN - only temperature measurement, with an outside sensor connected to a cable (mechanical construction analogous to a thermometer LB-710T).
Echelon, LON, LONWORKS, LONMARK, and the LONMARK logo are trademarks of Echelon Corporation registered in the United States and other countries.
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