- 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
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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.| TEMPERATURE
MEASUREMENT |
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|---|---|---|
| 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 |
| POWER SUPPLY | |
|---|---|
| Scope of voltage | 6..30 V DC |
| Energy consumption | 13 mA |
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Produced by: LAB-EL Laboratory Electronics 68b, Bodycha Str., 02-495 Warsaw tel: (022) 667 71 18, 0601 209656, fax: (022) 867 53 32 e mail: info@label.com.pl home page: http://www.label.com.pl internet meteorological station: http://www.meteo.waw.pl meteorological station on a mobile phone: wap.meteo.waw.pl Last updated: 08.07.2004 |
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