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.

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
Ref: Energoflow.com