Rotary Gas Meters EFS-R

Rotary flow meter for gas Energoflow EFS-R

Reference Rotary Gas Meters EFS-R

Overview

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

The meters are equipped with 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 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. 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.  

TABLE -1

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

TABLE - 2

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

24
20
Operating conditions:
-Temperature of operating environment and ambient air, °C, at least
- Relative humidity of air at 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

APPENDIX A - General Appearance

Rotary Gas Meters EFS-R

APPENDIX B - Possible solutions of meter mounting

Picture B.1
Picture B.2

Order code for reference rotor gas meter

EPS-R/200/1600/20/1,6/0,2/0/0/0/4/1/1/S
# 1 2 3 4 5 6 7 8 9 10 11 12 13 14
EFS- P D G N P Ak Ex Sm Mp I Dp Dt S

Legend explanation of typical order codes is given 
in Table

# 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.
Rotary Gas Meters EFS-R

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