Energoflow EFS-R Reference Rotary Gas Meters

Reference Rotary Gas Meters EFS-R Energoflow.html

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Energoflow EFS-R Reference Rotary Gas Meters is intended for installation on reference calibration rigs for calibration and verification of gas meters of any type with air as the operating environment.

The meters are equipped with an electronics unit (EU) and rotary transducer with mounted binary pulse-frequency sensors and pressure sensors. The meter EFS-R is intended for measuring the volume of gas passing through its input channel of the circular section. The gas flow volume is transmitted to a PC via the EU.


The meters are designed for vertical installation on the reference equipment with DN 20mm, DN 25mm, standard size G 2,5, G 10, G 16. The connection between the meter and PC is carried out via RS-485. Exchange protocol – Modbus RTU.  “Start-stop” synchronization is of two-wire type based on the communication line RS-485.

Ultrasonic gas flow meters ENERGOFLOW GF


Energoflow AG can provide flow metering solutions for the whole spectrum of applications required by the Gas sector.


Our flow meters can operate in a wide range of ambient conditions – we provide flow metering solution for very cold regions (ambient temperature -60 deg. C) as well as for hot locations (ambient temperature +70 deg. C). The Energoflow GF series of gas flow meters is designed to improve reliable and accurate measurement of gas flow in pipelines using the pulse-time method. These flow meters can be used for flow monitoring and measurement of air, natural gas, industrial gases, fuel gas etc. over a vast range of process conditions:

  • For flow speeds as low as 1 m/s and as high as 70 m/s;
  • For ambient temperatures as low as -65 C and as high as +70 deg. C;
  • In hazardous areas and hard to access locations;
  • When the pressure in the pipeline is as high as 160


The major advantages of the Energoflow GF series gas flow meters are:

  1. No obstruction to the flow and zero pressure loss;
  2. No moving parts and no mechanical wear or tear;
  3. Easy installation and simplicity of use;
  4. Easy integration into all kinds of process management systems;
  5. High accuracy, large turn-down ratio, reliable


Energoflow GF series flow meters can be accessed remotely via PC. Using special software, it is possible to display the following data as per customer’s choice:

  • Measurement results of direction and speed of flow, current flow rate, progressive total volume;
  • The waveform of the signal passing through the acoustic channel;
  • Configuration options and settings of the flow meter;
  • Clock readings and calendar;
  • Archive


We supply flow meters of various sizes, with different types of process connections, and for a wide range of ambient and process temperatures and pressure ratings.

The flow meters can be spool type or hot tapped type, depending on the application.

Product Size

DN Standard size Qmax, m 3 /h Qmin, m 3 /h
25 G 16 25 1,25
25 G 10 16 0,53
20 G 2,5 4 0,2

Energoflow EFS-R Technical Data

Parameters Value
General industrial application design Explosion-proof design
Measuring medium air
Operating pressure, MPa 1,6; 4,0; 6,3
Limits of basic relative permissible error,
not worse %
± 0,2
Repetition, at least % ± 0,03
Repeating accuracy within 2 years, at least % ± 0,1
Frequency output with adjusted multiplication factor Fmax, kHz 5
Signal of flow rate excess for the emergency system shutdown Type «dry contact»
Loading capacitance of emergency output shutdown:
voltage, V, max
max current, mA
Operating conditions:
-The temperature of the operating environment and ambient air, °C, at least
– Relative humidity of air at a temperature
+25 °C, %
– atmospheric pressure, kPa
10 up to 30

up to 80
from 84,0 up to 106,7

Power consumption, W, max 0,5 6,0
Supply voltage, DCV from 9 up to 24
Lifetime, min. years 10

Order code for reference rotor gas meter


Elements Legend Meter’s characteristics
1 EFS- Type of the reference meter.
2 Т Type of meter sections: R – rotary
3 D Nominal meter diameter, mm (see Table 1)
4 G Meter standard size (see Table 1)
5 N Flow range:
5 – 1/5 Qmax,
10 – 1/10 Qmax
20 – 1/20 Qmax
30 – 1/30 Qmax
40 – 1/40 Qmax
50 – 1/50 Qmax
100 – 1/100 Qmax
6 P Absolute operating pressure (1,6; 4,0; 6,3) МPа.
7 Ak Meter accuracy: 0,2%, 0.25%, 0,4%
8 Ex Availability of explosion protection: 1 – yes, 0 – no.
9 Sm Counting mechanism: 1 – yes, 0 – no.
10 Mp Availability of seal oil pump: 1 – yes, 0 – no.
11 I Type and quantity of pulse sensors:
0 – no,
1 – one low-frequency (LF),
2 – one high (HF),
3 – one low-frequency (LF) and one high (HF),
4 – two high (HF),
5 – one low-frequency (LF) and two high (HF).
12 Dp Availability of the pressure sensor: 1 – yes , 0 – no.
13 Dt Availability of the temperature sensor: 1 – yes, 0 – no.
14 S Section material : S- Steel.20, А – stainless steel.

Download Catalog: Ultrasonic Gas Flow Meters

Ref: Energoflow.com

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