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
humidity output type
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.
||+/- 0.2 °C, +/- 1 last digit|
|Scope of measurement||0 .. 85 °C||version LB-710NL|
|-40 .. 85 °C||version LB-710NLM|
||+/- 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|
|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
|Scope of humidity||20..80%|
|Level of environment corrosion aggressiveness accord. PN-71/H-04651||B|
|Scope of voltage||6..30 V DC|
|Energy consumption||13 mA|