Common CGR-01 Series User manual

COMMON S.A.
ul. Aleksandrowska 67/93
91-205 Łódź, Poland
Phone no.: [phone]
Fax: [phone]
ROTARY
GAS METERS
series
CGR-01
OPERATION MANUAL
(Technical manual)
CGR / IO12 / MID
July 2012
PLEASE READ THE OPERATION MANUAL BEFORE INSTALLING
AND OPERATING THE GAS METER

CGR/IO12/MID 1
Table of Contents
Page
I. INTENDED USE AND CONDITIONS OF USE 2
II. DESIGN AND FUNCTION 7
III. READOUT DEVICE AND MEASUREMENT OUTPUTS 9
IV. LABELLING AND PROTECTION 14
V. PACKAGING, TRANSPORT AND STORAGE 16
VI. INSTALLATION AND OPERATION 19
VII. OPERATION MONITORING, MAINTENANCE, FAILURES,
REPAIRS 26
VIII. ADDITIONAL EQUIPMENT 28
IX. LIST OF STANDARDS AND TECHNICAL SPECIFICATIONS 31

CGR/IO12/MID 2
I. INTENDED USE AND CONDITIONS OF USE
Intended use
Rotary gas meters CGR-01 are electromechanical pressure devices designed to measure the
volume of gas flowing through a system. In standard embodiment, the gas meters may be
used at sites with probable occurrence of explosive atmospheres formed as mixtures of gases
classified as explosion groups IIA and IIB (and group IIC for the special purpose
embodiment) with air. Table 1 lists the physical properties of the most common gases and gas
mixtures that may be measured with CGR-01 gas meters.
The rotary gas meters can be used both indoors in stabilized temperature conditions and
outdoors (open location); however, in the latter case, it is recommended that the gas meter is
shielded from direct exposure to atmospheric factors (metal containers, casings, roofs, shields
etc.) Ambient temperature range from –25°C to +70°C. System gas temperature range from
—20°C to +60°C. Storage temperature range from –30°C to +70°C. Maximum working
pressure pmax = 1.6 MPa.
Conditions for use
1. Compliance with Directive 2004/22/WE (MID) :
-certificate PL –MI 002 –1450CL0002
-CE marking 1450, Oil and Gas Institute
-ambient temperature range –25° C Ta + 70° C
-gas temperature range from –20° C to + 60° C
-storage temperature range from -30o C to + 70o C
-maximum working pressure pmax = 1.6 MPa
-mechanical environment class M2
-electromagnetic environment class E2
--metrological parameters Table 2.
-metrological accuracy class 1.0
-operational position HV,
- harmonized standards: PN-EN 12480:2005 (EN 12480:2002),
PN-EN 12480:2005/A1:2008 (EN 12480:2002/A1:2006),
2. Compliance with Directive 94/9/WE (ATEX) :
-certificate KDB 04ATEX034,
-CE marking 1453, Central Mining Institute, Experimental Mine
”Barbara”.
-operation conditions standard embodiment II 2G Ex ia IIB T5 Gb
special-purpose embodiment II 2G Ex ia IIC T5 Gb
- meter case index of protection IP66/IP67,
- harmonized standards: PN-EN 13463-1:2010 (EN 13463-1:2009),
PN-EN 60079-0:2009 (EN 60079-0:2009),
PN-EN 60079-11:2010 (EN 60079-11:2007).
3. Compliance with Directive 97/23/WE (PED) :
-certificate 37286/JN/001/04,
-CE marking 1433, Office of Technical Inspection
-compliance with technical specification WUDT/UC/2003.
Mxx

CGR/IO12/MID 3
-maximum calculated pressure for gas meter bodies:
connection PN16 PS = 16 bar,
connection PN20 (ANSI150) PS = 20 bar,
connection PN25 (only cast iron bodies) PS = 25 bar.
- ambient temperature –25° C to + 70° C
4. Compliance with Directive 2004/108/WE (EMC) :
- requirements met by the use of LF and HF pulse emitters (NAMUR)
compliant with the following harmonized standards:
PN-EN 60947-5-2:2011 (EN 60947-5-2:2007),
PN-EN 60947-5-6:2002 (EN 60947-5-6:2000).
Table 1. Physical properties of the most common gases and gas mixtures that may be
measured with CGR-01 gas meters. Densities under pressure of 101.325 kPa at
20oC
Gas
or
gas mixture
Chemical
symbol
(formula)
Density

[kg/m3]
Relative
density
w
Gas meter
embodiment
argon
Ar
1.66
1.38
standard IIB
nitrogen
N2
1.16
0.97
standard IIB
butane
C4H10
2.53
2.1
standard IIB
carbon dioxide
CO2
1.84
1.53
standard IIB
ethane
C2H6
1.27
1.06
standard IIB
ethylene
C2H4
1.17
0.98
standard IIB
natural gas
CH4
ca. 0.75
ca. 0.63
standard IIB
helium
He
0.17
0.14
standard IIB
methane
CH4
0.67
0.55
standard IIB
propane
C3H8
1.87
1.56
standard IIB
carbon monoxide
CO
1.16
0.97
standard IIB
acetylene
C2H2
1.09
0.91
special IIC
hydrogen
H2
0.084
0.07
special IIC
air
–
1.20
1
standard IIB
Basic metrological parameters of CGR-01 rotary gas meters are listed in Tables 2a and 2b.
The table should not be taken as current sales offer; relevant information may be obtained at
Common S.A. .
The gas meter causes a gas pressure drop in the system. The values of the gas pressure drops
as determined at Qmax (for atmospheric air conditions with density 0= 1.2 kg/m3) for all
CGR gas meter embodiments may be found in Table 2.
In actual conditions, pressure loss pr[Pa] is calculated according to the formula:
where: w = / 0 –relative gas density (compared to air density) as in Table 1,
pa–atmospheric pressure (pa101 [kPa] ),
p –gauge gas pressure upstream the gas meter [kPa],
Wpd –Pressure drop ratio determined from Fig. 1
p –pressure drop at Qmax determined from Table 2 [Pa].

·Wpd·p
p
p
p
p
rz
a
a



w

CGR/IO12/MID 4
Fig. 1. The pressure drop ratio as a function of the relative flow Q/Qmax.

CGR/IO12 5
Table 2a. Basic metrological parameters of CGR-01 gas meters in aluminium bodies.
DN
nominal
diameter
G
Gas meter
size
Qmax
Maximum
flow
Qmin
minimum flow in [m3/h ]
LF
emitter constant
HF
emitter constant
(approximate)
V
cyclic
volume
∆p
loss of pressure
at Qmax
Gas meter
series
[mm]
[m3/h]
scale:
[pulses/m3]
[pulses/m3]
[dm3]
[Pa]
[–]
1:50
1:65
1:100
1:160
1:200
1:250
40/50
G10p
16
0.3
0.25
0.16
–
–
–
10
15459
0.23
110/85
"171"
40/50
G16p
25
0.5
0.4
0.25
0.16
–
–
10
15459
0.23
185/140
"171"
40/50
G16w
25
0.5
0.4
0.25
0.16
–
–
10
11470
0.31
105/80
"171"
40/50
G25s
40
0.8
0.65
0.4
0.25
0.2
0.16
10
15459
0.23
375/280
"171"
40/50
G25p
40
0.8
0.65
0.4
0.25
0.2
0.16
10
11470
0.31
240/180
"171"
40/50
G25w
40
0.8
0.65
0.4
0.25
–
–
10
7111
0.50
110/80
"171"
40/50
G40s
65
1.3
1.0
0.65
0.4
0.3
0.25
10
11470
0.31
480/360
"171"
40/50
G40p
65
1.3
1.0
0.65
0.4
0.3
0.25
10
7111
0.50
280/210
"171"
40/50
G40w
65
1.3
1.0
0.65
0.4
–
–
10
4390
0.81
195/150
"171"
50/80
G65s
100
2.0
1.6
1.0
0.65
0.5
0.4
10
7111
0.50
420/320
"171"
50/80
G65p
100
2.0
1.6
1.0
0.65
0.5
0.4
10
4390
0.81
325/290
"171"
50/80
G65w
100
2.0
1.6
1.0
0.65
–
–
10
2867
1.24
245/200
"171"
50/80
G100s
160
3.2
2.5
1.6
1.0
0.8
0.65
1
4390
0.81
570/430
"171"
50/80
G100p
160
3.2
2.5
1.6
1.0
0.8
0.65
1
2867
1.24
505/395
"171"
80/100
G100p
160
3.2
2.5
1.6
1.0
0.8
0.65
1
1654
1.29
220/160
"241"
80/100
G100w
160
3.2
2.5
1.6
1.0
–
–
1
1067
2.00
180/135
"241"
80/100
G160s
250
5.0
4.0
2.5
1.6
1.3
1.0
1
1654
1.29
530/400
"241"
80/100
G160p
250
5.0
4.0
2.5
1.6
1.3
1.0
1
1067
2.00
370/280
"241"
80/100
G160w
250
5.0
4.0
2.5
1.6
–
–
1
639
3.34
270/210
"241"
100
G250s
400
8.0
6.5
4.0
2.5
2.0
1.6
1
1067
2.00
660
"241"
100
G250p
400
8.0
6.5
4.0
2.5
2.0
1.6
1
639
3.34
510
"241"
100
G400s*
650
13
10
6.5
4.0
3.2
2.5
1
639
3.34
1380
"241"
Gas meter size p –basic version;
w –low-speed version (larger overall dimensions, reduced pressure loss and noise level),
s–high-speed version (smaller overall dimensions, increased pressure loss and noise level),
* –MID certificate does not apply to this version.

CGR/IO12/MID 6
Table 2b. Basic metrological parameters of CGR-01 gas meters in cast iron bodies.
DN
nominal
diameter
G
Gas meter
size
Qmax
Maximum
flow
Qmin
minimum flow in [m3/h ]
LF
emitter constant
HF
emitter constant
(approximate)
V
cyclic volume
∆p
loss of pressure at
Qmax
Gas meter
series
[mm]
[m3/h]
scale
[pulses/m3]
[pulses/m3]
[dm3]
[Pa]
[–]
1:50
AM
1:65
1:100
1:160
1:200
1:250
40/50
G10w
16
0.3
0.25
–
–
–
–
10
7111
0.50
33/17
"171"
40/50
G16w
25
0.5
0.4
0.25
–
–
–
10
7111
0.50
45/35
"171"
40/50
G25w
40
0.8
0.65
0.4
0.25
–
–
10
7111
0.50
110/80
"171"
40/50
G40p
65
1.3
1.0
0.65
0.4
0.3
0.25
10
7111
0.50
280/210
"171"
40/50
G40w
65
1.3
1.0
0.65
0.4
–
–
10
4390
0.81
195/150
"171"
50/80
G65s
100
2.0
1.6
1.0
0.65
0.5
0.4
10
7111
0.50
420/320
"171"
50/80
G65p
100
2.0
1.6
1.0
0.65
0.5
0.4
10
4390
0.81
325/290
"171"
50/80
G65w
100
2.0
1.6
1.0
0.65
–
–
10
2867
1.24
245/200
"171"
50/80
G100s
160
3.2
2.5
1.6
1.0
0.8
0.65
1
4390
0.81
570/430
"171"
50/80
G100p
160
3.2
2.5
1.6
1.0
0.8
0.65
1
2867
1.24
505/395
"171"
80/100
G100w
160
3.2
2.5
1.6
1.0
–
–
1
1067
2.00
180/135
"241"
80/100
G160p
250
5.0
4.0
2.5
1.6
1.3
1.0
1
1067
2.00
370/280
"241"
80/100
G160w
250
5.0
4.0
2.5
1.6
–
–
1
639
3.34
270/210
"241"
100
G250s
400
8.0
6.5
4.0
2.5
2.0
1.6
1
1067
2.00
660
"241"
100
G250p
400
8.0
6.5
4.0
2.5
2.0
1.6
1
639
3.34
510
"241"
100
G400s*
650
13
10
6.5
4.0
3.2
2.5
1
639
3.34
1380
"241"
Gas meter size p –basic version;
w–low-speed version (larger overall dimensions, reduced pressure loss and noise level),
s –high-speed version (smaller overall dimensions, increased pressure loss and noise level),
* –MID certificate does not apply to this version.

CGR/IO12 7
II. DESIGN AND FUNCTION
The rotary gas meter is a volumetric rotary machine based on the principle of proportionality
of the speed of rotation of rotors to the actual volume of gas flowing through the gas meter at
particular pressure and temperature conditions. The gas flowing into the gas meter (Fig. 2)
fills the measurement chamber and the inlet overpressure causes rotation of rotors and
transport of a portion of gas to the gas meter outlet. The rotational motion of rotors is
transmitted to the counter by means of gears and magnetic clutch. The counter mechanism
totals up the volume flowing through the device, and a revolving counter indicates the total
volume.
Fig. 2. Operation of the CGR-01 rotary gas meter.
The rotary gas meter (Fig. 3) is built of the following basic elements:
Main body. The main body assembly consists of the main body and the front and back
covers. The covers are bolted to the body and secured with seals. The main body is complete
with sockets for the measurement of gas pressure and temperature and two flat face
connections with threaded holes to install the gas meter in the pipeline. The front cover
includes a gas-tight partition to separate the gas chamber from the environment as well as the
oil filler plug and oil level inspection window.
The measurement assembly. The measurement assembly is secured between the main body
covers using elastic sealing inserts. The assembly consists of the measurement chamber with
rotating rotors and two side chambers separated by internal partitions. The rotors are installed
in these covers using roller bearings. Both side chambers contain a reserve supply of oil for
lubrication of bearings and gears of the measurement system. Lubrication is achieved by
means of oil spray generated by blades installed on rotor shafts.
Drive transmission assembly. The drive transmission assembly is installed in the front cover
and transmits the rotary motion of the rotors from the measurement assembly to the counter
through a gas-tight partition. The assembly consists of a cog gear and a magnetic clutch. The
driven part of the clutch may be complete with an inducer for the high frequency emitter.
The counter assembly. The counter assembly further reduces the rotational speed (by means
of a worm gear and cylindrical gears) to drive the mechanical counter and the elements that
induce the low frequency electric signal emitters. The assembly is also complete with sockets
for transmitting the low and high frequency electric signals outside the gas meter.

CGR/IO12/MID 8

CGR/IO12/MID 9
Fig. 3. Cross-section of the rotary gas meter CGR-01

CGR/IO12/MID 10
III. READOUT DEVICE AND MEASUREMENT OUTPUTS
The gas meter CGR-01 is equipped with a readout device in the form of a mechanical counter
and electric signal outputs, a pressure measurement output and temperature measurement
output (optional). The outlets allow to monitor the gas meter operation and to connect the
external equipment. Fig. 4 shows the location of the measurement outlets on the gas meter.
The mechanical counter is located inside the counter assembly and visible through a
polycarbonate inspection window. The counter allows direct readout of the actual volume of
gas that has flown through the gas meter under particular pressure and temperature conditions.
The counter assembly may be rotated around the horizontal axis of the gas meter in a range of
ca. 350o, allowing for convenient readout of the counter from virtually all directions.
Fig. 4. Location of measurement outlets of a CGR-01 gas meter.
Electric signal outlets. There are two possible types of electric signal outlets: low frequency
(LF) outlets and high frequency (HF) outlets. The counter may be equipped with the
maximum of two sockets and six electric pulse emitters.
-Two low frequency reed contact emitters (LFK),
-two inductive low frequency emitters (LFI),

CGR/IO12/MID 11
-two inductive high frequency emitters (HF),
and with a control circuit featuring a normally closed reed relay switch AFK or, alternatively,
any other emitter.
The reed relay emitters LFK are designed to work with a battery-powered or grid/battery-
powered data logger and volume converter located in the vicinity of the gas meter (up to ca. 2
m). The induction emitters, both of the LFI and the HF type, may emit electric current signals
over significantly longer distances (up to ca. 200 m, depending on conditions). Due to high
power consumption, they are designed to work only with grid-powered volume converters.
Gas volumes corresponding to individual pulses of the LF emitter are presented in Table 2.
The number of HF pulses per one square meter of gas is determined individually for each gas
meter and listed on the type plate. The approximate value of the HF emitter constant is given
in Table 2. The HF outlet is particularly useful for tracking changes in the flux of the gas
flowing through the gas meter.
All emitters located in the gas meter counter assembly are connected to Amphenol-Tuchel
C091 31N006 100 2 sockets located in the back wall of the counter case. Cords connected to
sockets should be equipped with Amphenol-Tuchel C091 31H006 100 2 plugs. Amphenol-
Tuchel connections in CGR gas meters are in the IP67 protection class. Table 3 presents
potential connections of emitters to individual electric signal output sockets.
Table 3. Potential connections of gas meter emitters to electrical output sockets.
conta
ct
polarity
LFK 1
LFK 2
AFK
LFI 1
LFI 2
HF 1
HF 2
1

S
O
4
+
S
O
Socket 1
2

O
P
P
O
O
5
+
O
P
P
O
O
3

O
P
6
+
O
P
1

P
O
4
+
P
O
Socket 2
2

O
O
P
O
5
+
O
O
P
O
3

O
P
6
+
O
P
S –standard connections
P –preferred connections
O –optional connections
Standard embodiment of the CGR-01 gas meter features only one
low frequency reed relay emitter LFK 1.
One of the inductive emitters installed in the counter may act as a control element in the
CGR-01 gas meter. If the counter is not equipped with a HF emitter, an external control
element may be connected to the gas meter for testing purposes (see section VII). Inductive
HF emitter type Bi1-EG05-Y1 by Hans Turck GmbH should be used as the external control
element. The type plate of the gas meter includes the value of the constant for emitters HF1
and HF2; this value is also valid for the external control element emitter. After disconnecting
the control element, the socket is tightly plugged and sealed (Fig. 9).

CGR/IO12/MID 12
In line with the conditions for use, the CGR-01 gas meters should be equipped with emitters
allowing for at least II 2G Ex ib IIC T5 Gb protection. This condition is satisfied for
instance by the following emitters used in the counter:
-HF type Bi1-EG05-Y1(1) by Hans Turck GmbH; II 1G Ex ia IIC T6.
-LFI type Si5-K09-Y1-LF(1) by Hans Turck GmbH; II 1G Ex ia IIC T6.
-LFK type CLFK-02 by Common S.A. II 2G Ex ia IIC T6.
(1) –required linear characteristics of the emitter power circuit.
Acceptable intrinsic safety parameters
HF
LFI
LFK
Ui= 20 V DC
Ui= 20 V DC
Ui= 15.5 V DC
Ii= 60 mA
Ii= 60 mA
Ii= 52 mA
Pi= 200 mW
Pi= 130 mW
Pi= 169 mW
Li= 150 μH
Li= 350 μH
Li≈ 0
Ci= 150 nF
Ci= 250 nF
Ci≈ 0
Intrinsic safety parameters of the emitters installed in the gas meter are listed on the type
plate.
Nominal operating parameters of the emitters:
reed relay emitter CLFK-02:
closed switch resistance Rz= 100÷ 2 k,
open switch resistance Ro> 100 M,
max. switching frequency fp= 2 Hz .
inductive emitters Si5-K09-Y1-LF Bi1-EG05-Y1
max. switching frequency fp= 2 Hz, fp= 0.5 kHz.
The remaining nominal operating parameters of the emitters used in the gas meters are in line
with the requirements of the PN-EN 60947-5-6:2002 standard.
Pressure measurement outlet.
Pressure measurement outlets (pulse openings) are located at both sides of the main body
(Fig. 4). Openings are complete with ¼ NPT threaded slots (Fig. 5).
a.) b.)
Fig. 5. ¼ NPT pressure measurement slot
The outlets are used to connect pressure transducers, either directly to the socket (Fig. 5b) or
via three-way valves. Outlets that are not in use are blinded with plugs (Fig. 5a). Both plugs
and sockets may be protected by installation seals.

CGR/IO12/MID 13
Temperature measurement outlet.
The turbine gas meter CGR-01 allows temperature measurements only when delivered as a
special order version; temperature measurements are not available in the standard version.
Temperature measurement outlets are located at both sides of the main body (Fig. 4). The
body openings are complete with temperature pockets (Fig. 6) with the length of L=110 mm
for the bodies of the “171” series and L=120 mm for the bodies of the “241” series. The
temperature pockets feature G ½” thread sockets (M12 x 1.5 in special embodiments).
Electric thermometer tips or temperature transducers are immersed in silicone oil in the
thermometric ferrules (Fig. 6b). Temperature pockets not in use (Fig. 6a) are blinded with
plugs. Outlets that are not in use are blinded with ¼ NPT plugs (Fig. 5a).
a) A temperature pocket b) Temperature pocket with a thermometer
Fig. 6 Temperature pockets

CGR/IO12/MID 14
Mechanical counter outlet (option)
The gas meter may be optionally equipped with a mechanical outlet. The mechanical outlet
may be used to drive external, removable devices connected to the gas meter counter. A
paddled tip of the counter shaft is located on the right side of the counter and covered by a
protective cap. The rotational speed of the shaft is identical to the speed of the fastest counter
barrel. The shaft rotates in counter-clockwise direction; the direction is marked on the plate
(Fig. 7b) fixed at the mechanical outlet cover. The values of the maximum acceptable
allowable momentum of the mechanical outlet shaft tip Mmax = …… [Nmm] and the constant
corresponding to one complete turn of the drive shaft, 1 tr = …… [m3] are also given on the
plate.
Fig. 7a Mechanical outlet drive shaft
Fig. 7b Mechanical outlet type plate

CGR/IO12/MID 15
IV. LABELLING AND PROTECTION
Information on the basic technical parameters of the gas meter along with the serial number
and manufacture year is listed on rating plates (Figs. 8a and 8b) bolted to the counter casing.
Fig. 8a. Type plates –standard version IIA and IIB
Fig. 8b. Type plates –special version IIC
The top of the gas meter body features signs informing about the direction of gas flow and the
locations of pressure and temperature measurement outlets (Fig. 4).
Following verification by the authorized manufacturer laboratory, each gas meter is protected
with seals placed in locations shown in Fig. 9. Seal P1 features the initial verification or
secondary verification stamp (Fig. 10) while seals P2, P3, P4, P5, P6, P7, P8 feature

CGR/IO12/MID 16
protection stamps. By request of the customer, the gas meter may be delivered along with the
verification certificate that documents its verification.
Fig. 9. Locations of seals on CGR gas makers
The initial verification period depends on metrological regulations in the country of
installation. Before the end of the verification period, the gas meter should be submitted for
secondary verification at an authorized laboratory (one should also provide for the waiting
time before the actual legal approval date)
Common S.A. offers secondary verification at the manufacturer's laboratory, allowing for
adjustments or repairs of the gas meters, if required.
Retaining the verification stamp seal is required for the gas meter to be considered a
legal measurement device.
Fig. 10 Initial verification stamp

CGR/IO12/MID 17
V. PACKAGING, TRANSPORT AND STORAGE
The gas meter is supplied in factory-made packaging which provides appropriate protection
during transport and storage (Figs 11a and 11b). The packaging consists of reinforced
cardboard box and profiled cardboard inserts. Appropriate information regarding the contents
and restrictions regarding gas meter loading/unloading and transport is printed on the
packaging. Side walls of the box feature handle holes for transporting the gas meter. Gas
meters submitted for repair or renewed legal approval should be sent in factory-made
packaging or other packaging providing at least equal protection during transport.
Every rotary gas meter produced by Common S.A. is supplied with the following:
-a 6-pin Amphenol-Tuchel C091 31H006 100 2 plug to be used for connecting a
converter or data logger to the low frequency electric signal outlet;
-a bottle of oil for gas meter lubrication;
-a set of elements for fixing the gas meter in the installation: hexagonal flat end
M16x70 set screws compliant with the PN-EN ISO 4026:2004 standard, washers
and nuts;
-the technical manual.
The rotary gas meter is a high precision measurement device
and should be handled with appropriate caution.
Following principles should be observed during transport and storage of the gas meters:
1. Gas meters should not be thrown, turned over or subjected to strong impacts (e.g. during
fast transport using carts without springs).
2. One must not lift or carry the gas meter by holding the counter assembly case.
3. Factory-placed covers or other shields of gas meter orifices should not be removed until
directly before installation.
4. The storage site should protect the gas meter from atmospheric precipitation and moisture.
5. Care should be taken of the seals placed on the gas meter. Damage of seals may lead to
warranty voidance and legal consequences as regards the clearance of accounts
between the gas supplier and the customer.
6. It is not required for the gas meter to be primed with oil during warehouse storage.

CGR/IO12/MID 18
Fig. 11a & 11b. Packaging of the CGR-01 gas meters series “171” & “241”

CGR/IO12/MID 19
VI. INSTALLATION AND OPERATION
Before installing the gas meter ensure that it is suitable for the system's operational
parameters. In particular, following type plate information should be taken into consideration:
Acceptable gas meter gauge pressure [MPa], labelled pmax,
Maximum actual flow [m3/h], labelled Qmax .
Maximum load of the gas meter, Qmax, may be exceeded
by not more than 25% for not longer than 30 minutes.
Rotary gas meters CGR-01 may be operated in the following four operating positions (Figure
12 a, b, c, d):
Fig. 12. Operating positions of the CGR-01 rotary gas meter.
The gas meter may not be placed vertically!
Figure 12 e) & f)
Fig. 13. Acceptable deviations from the horizontal position of the gas meter.