Water flowmeters (water meters) Floukor DRC-4A, DRC-4B, etc.

• DRK-4A - has only a pulse output; during the time between two pulses, a given volume of liquid is pumped through the pipeline, called the pulse price;

• DRK-4V - has a pulse output, an indicator of accumulated volume, instantaneous flow and operating time, as well as a current output signal of 0-5 or 4-20 mA and a built-in power supply operating from a 220 V, 50 Hz network. In addition, DRK-4B flowmeters have an archive with hourly registration of the accumulated volume for 46 days, an RS-232 port for communication with a computer and an RS-485 port (optional).

According to the diameter of the pipeline in which the measurement is made, the flowmeters have two versions:

• DRK-4A (B)1 - designed for installation on pipelines with an internal diameter from 80 to 350 mm.
• DRK-4A (B)2 - designed for installation on pipelines with an internal diameter of more than 300 mm.

• Safety requirements: sensors belong to class 0 according to GOST 12.2.007.0-75
• Protection against dust and water penetration - IP54 according to GOST 14254-80
• Relative humidity (at a temperature of 35 ° C) - up to 95%
• Ambient air temperature from -40 to +50 ^o C
• The storage time of information in the counters of accumulated volume and operating time with power off is at least 10 years
• The total average service life of the meters is 8 years
• The devices are designed to measure the volume of liquid with parameters:
  • Working fluid temperature from +1 to +150 ^o C
  • Working fluid pressure up to 2.5 MPa (25 kgf/^cm2)
  • The viscosity of the liquid is up to 2.0 cSt
• The internal diameter of the pipeline is from 80 to 4000 mm.
• The minimum measured flow rate (on pipes with an internal diameter of 80 mm.) is 2.7 ^m3/h
• The maximum measured flow rate (on pipes with an internal diameter of 4000 mm.) is 452000 ^m3/h
• Limits of permissible relative error in measuring volume and flow by pulse signal and indicator: ± 1.5%
• Limits of the measured reduced error of flow measurement by Current signal: ± 1.5%
• The length of the straight section in front of the acoustic transducers:
  • not less than 5d (if a round knee, a fully open gate valve or a conical narrowing with an angle of no more than 30 ^o are located in front of them)
  • at least 10D in other cases ( there should be a free pipe along the pipe axis in front of the primary converter, which does not have elements protruding inside - temperature sensors, pressure gauges, etc.)
• The length of the straight section after the acoustic transducers is at least 2Du
• The sensors have a pulse output signal (all versions), which can be transmitted as current pulses or removed from the optocoupler output, as well as a DC output signal proportional to the instantaneous flow rate (only DRC-4V). Signal Parameters:
  Pulse
  • pulse duration - at least 125 ms
  • the amplitude is (10 ± 3) mA with a load of no more than 500 ohms
  Optocoupler output
  • pulse duration - at least 250 ms
  • voltage in the output circuit - no more than 30 V
  • the value of the current pulse in the output circuit is not more than 100 mA
  Parameters of the current output signal
  • 0-5 mA with a load resistance of no more than 2 kOhm
  • 4-20 mA with a load resistance of no more than 500 ohms
• The DRK-4V devices are powered from an alternating current network with a voltage of (187... 242) V and a frequency of 50 ± 1 Hz. Consumed power not more than 20 VA
• The DRK-4A devices are powered from a stabilized DC source (11.5...15) V at a load of up to 500 mA. The resistance of the communication line is not more than 5 ohms per core

• Water flowmeters, DRC-4 water meters. User Manual

• Correlation DRC-4 water flowmeters. Description of the type of measuring instrument.

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