Converters temperatures A- 2

Converters temperatures A- 2

Converters temperatures A- 2

Temperature Converters A-2 (further – converters) are intended For measurements temperatures of liquid and gaseous media, chemically non-aggressive to the material protective reinforcement or sleeves, with the conversion of the measured temperature into a unified output signal of constant force current With imposed to it with a digital signal of the HART standard or digital signal interface​ Foundation Fieldbus , or With transformation​ And display results​ measurements temperatures on display.

Principle Actions Converters  have a collapsible design And consist from measuring​ inserts – platinum sensitive element (sensor) with nominal static characteristics transformations (NSH) type “Pt100”, placed V protective​ reinforcement or cartridge case And electronic​ converter. The electronic converter  is placed  in the field body, To to whom With with the help of threaded connections at-

 

Converters temperatures A- 2
waveguide-1

connects protective reinforcement or cartridge case With sensor inside.

Internal Part field body divided on two hermetically sealed isolated compartments . One contains terminal block For connections​ cables nutrition And communications, and in the other – an electronics unit and an optional liquid crystal display. Principle actions the converter is based on the phenomenon of change electric resistance​ sensitive element (sensor) – platinum resistance temperature transducer from the temperature of the measured environment, with subsequent transformation of changes in electrical resistance or V electrical continuous output signal of constant current from 4 to 20 mA proportional to the measured temperature with a digital display superimposed on it frequency- modulated signal V standard HART or a digital signal transmitted via an interface Foundation Fieldbus . When equipped with an electronic converter liquid crystal the display shows the measurement results at the location where the converter is installed temperature.

Converters are manufactured V two performances A-2H and A-2T, which differ range​ measurements temperatures and standardization errors measurements​​ temperature.

Technical characteristics

Name characteristics Meaning
Normal conditions operation:
–  temperature surrounding Wednesday, °C
–  relative humidity air, %
–  atmospheric pressure, kPa		 from +5 to +45
from 5 to 95
from 84 to 106.7
Workers conditions operation:
–  temperature surrounding Wednesday, °C
–  relative humidity air, %
–  atmospheric pressure, kPa		 from -40* to +75 from 5 to 95
from 84 to 106.7
Range weekend analog electrical signal:
– constant current, mA		 from 4 to 20
Voltage nutrition (constant current):
–  nominal working voltage, IN
–  minimal, IN
–  maximum, IN		 24
12
30
Overall dimensions dimensions corps measuring transducer
(D X Sh X G), mm, Not more		 160x200x140
Length installation parts, mm from 150 to 850
Weight, kg, Not more 15

* Temperature surrounding Wednesday workers conditions For converters temperatures with liquid crystal display from -30 °C to +75°С

Metrological characteristics

Name characteristics Meaning characteristics for execution
A-2H A-2T
Range measurements temperatures, ºС from -50 to +110 from -80 to +300
Interval measurements temperatures (t max -t min ), ºС* from +15 to +100** from +15 to +220**
Limits permissible basic absolute error converter, ºС ±0.2 –
Limit permissible basic relative error, % – ±0.5
Limits permissible additional absolute error converter at temperature change surrounding Wednesday from normal conditions operation V range ambient temperatures Wednesday workers conditions, ºС ±0.0042 –
Limits permissible additional relative error of the converter when changing temperatures surrounding Wednesday from normal conditions V range ambient temperatures Wednesday workers conditions, % – ±0.005
Conditional designation nominal static characteristics transformations (NSH) sensor (CHE) by IEC 60751/GOST 6651-2009 Pt100

* This interval is configurable V borders range measurements temperatures, respectively, t max And t min – top And lower limits configured interval measurements, lying inside range measurements, °C.
** It is being installed With step by step 1 °C.