Appointment, principle of action
Converters measuring differences of pressure pneumatic 13DD11 (further converters) are intended for work in systems of automatic control and management of productions for the purpose of issue of information in the form of the unified pneumatic signal of pressure difference, a consumption of liquid and gas, and also liquid level. Converters belong to the State System of Devices (SSD). Converters are operated together with the secondary registrars and regulators working from a standard signal of 20100 kPa. Converters are widely used in the chemical, oil-processing, petrochemical industry and some other areas.
The principle of operation of the converter is based on pneumatic power compensation. Under the influence of a difference of pressure (difference) brought to plus "+" and minus "" to cameras on a sensitive element of the measuring block there is an effort proportional to difference of pressure. Under the influence of the measured effort the lever turns on a small corner and moves the gate concerning a nozzle therefore pressure in the camera of the pneumorelay and in the feedback bellow valve connected with it changes. This pressure is an output signal of the converter.
Main technical characteristics
|Extremely allowed working excessive pressure, MPa||2.5||40||16|
|Limits of measurement (kPa)||4,0; 6,3; 10,0||16,0; 25,0; 40,0; 63,0; 100,0; 160,0||16,0; 25,0; 40,0; 63,0; 100,0; 160,0; 250,0; 400,0; 630,0|
|Measurement error ± (%)||0,6; 1,0|
|Output signal (kPa)||From 20 to 100, indulges on the communication line on distance to 300 m (with an internal diameter of the communication line of 6 mm)|
|Climatic modification (for air temperature)||UHL2, T2 (from 10 to +50 °C; from 50 to plus +50 °C)|
|Power supply of the device||Compressed air 140 ± 14 kPa, an air Consumption to 3 l/min.|
|The weight, kg Without valve block||8.0||5.2||5.2|
1 For models 728 on a limit of measurement of 63,0 KPA and model 720 on a limit of measurement of 250,0 KPA an error of measurement of ±1%. 2 Converters of model 720 on limits of measurements 400, 250, 630 kPa are manufactured in coordination with a predpriyatiyemizgotovitel.
Rating statistical data (dependence of an output signal from pressure difference) linear. Converters are supplied by the proofreader of zero allowing to establish the output signal corresponding to zero value of the measured pressure difference. The membrane block of the converter is filled with polimetilsiloksanovy PMS6 liquid in accordance with GOST 1303277 (the code 001 at the order) or water glyceric solution (60% of water and 40% of glycerin for oxygen measurement) the code 002 at the order. Degree of protection of converters against penetration of dust and IP54 water in accordance with GOST 14254 96. Materials of the details adjoining to the measured environment are given in the table.
|Material||Code of execution|
|sensitive elements||other details adjoining to the measured environment|
|TVCh1 tantalum||Carbonaceous steel||5080|