Instromet IRM INFINITY User manual

Brand: Instromet

Model: IRM INFINITY

Type: User manual

ROTARY PISTON GAS METER

IRM INFINITY

ROTARY PISTON GAS METER IRM

M-IRM-12

NATIONAL

ACCREDITATION

OF CERTIFICATION

BODIES

GENERAL

The Instromet IRM Infinity rotary piston gas meter is a positive displacement type meter which, by means of a counter,

registers the quantity of gas in units of volume at the prevailing measurement pressure and temperature (operating m3).

The Instromet rotary meter fully complies with the requirements of many international and national standards regar-

ding design and accuracy and is approved to EEC and Dutch specifications by the Nederlands Meetinstituut (NMI). Instro-

met BV is certified in accordance with ISO 9001.

THE IRM INFINITY ROTARY PISTON GAS METER

Stress-free and low-noise replaceable meas-

urement module embedded in flexible seals.

Temperature sensor points

Oil filling

(under index)

Hinged type plate

Oil drain

Low frequency

connections

Oil sight gauge

Pressure Point

OPERATION

The Instromet IRM Infinity meter is a high accuracy positive displacement meter

which is insensitive to changes in the relative density of the gas to be measured.

Measurement takes place by means of two figure eight rotors (synchronized by

gears) which rotate in a chamber of known volume. Four times per revolution, a

fixed unit of volume is displaced (see hatched

areaindrawing). Therevolutionsof

the

rotors are transmitted to the counter by means of amagnetic coupling. The

design, combined with the precision-finishing of both the rotors and the measu-

ring chamber, ensures a

continuous seal without

actual contact between

these components. This

minimizes the possibility of

gas passing through the

chamber without being

measured.

Main-measurement chamber and rotors

The Instromet IRM Infinity meter is

suitable for the measurement of all

non-corrosive gases, such as natural

gas, propane, butane, air, nitrogen,

dry hydrogen, ethylene, etc. The IRM

Infinity meter can be used for meas-

urement where a high accuracy is

requiredoverawideoperating range

APPLICATIONS

CONSTRUCTION AND RANGE

The range or turn down of the Instromet Infinity meter

is far in excess of any other type or design of rotary

meter due to the following features: Instromet uses a

modular type design, which permits the use of a

separate measurement module inserted in the pressure

housing. The measurement module is pressure

balanced and in thermal equilibrium with

the gas. Neither the pressure nor the temperature

of either the gas or the ambient atmosphere

causes any mechanical stress that could affect meter

performance. External forces transferred by the piping

on to the meter body are not transferred to the

measurement module. These features permit

precision machining of the measurement parts,

guaranteeing an extremely low-flow capability with

repeatable high pressure measurement and atmospheric

calibration curves. The pressure balanced design ensures that there are no dimensional changes in the measurement ele-

ment itself and therefore no internal passage of unmeasured gas. By using this modular design, replacement of the

measurement module (pre-calibrated) can be carried out in less than 10 minutes while the meter body remains installed.

This simplifies maintenance.

RESONANCE

OR OSCILLATION

All rotary type meters are subject to

resonance or oscillation at certain

flow points. This oscillation is caused

by a variable discharge of the flow

chamber and may occur at specific

flow rates or revolutions of the

meter.

The unique design of the Instromet

IRM infinity meter, whereby the

space around the flow module func-

tions as a dampener, makes the

meter substantially less prone to

oscillation. This, together with the

wide operating range, make the IRM

an ideal meter for low and high pres-

sure transfer provers.

REPLACEMENT OF

INDUSTRIAL DIAPHRAGM

METERS BY INSTROMET

ROTARY METERS

Because of its exceptional measure-

ment range, Instromet rotary gas

meters are frequently installed to

replace large industrial diaphragm

meters. Not only do they meet all

range requirements but they also

take up less space and thus reduce

installation costs.

NOISE AND

NOISE TRANSFER

The Instromet IRM Infinity measure-

ment module is embedded in flexible

seals in the meter body. Therefore a

large part of the noise created by the

rotors and gas displacement is not

transferred to the meter body and

connecting piping system.

This results in a meter which is

quieter than any other rotary meter.

INCREASING RANGE IN

METERING

By using an Instromet IRM Infinity

meter in combination with a range

extender in a regulating station, the

meter size can be reduced depending

on the available inlet pressure.

Piping, valves and fittings can be

reduced and ranges of over 1:1000

can be achieved. The range extender

provides effective restriction of the

flow rate, eliminating the risk of

overspeeding.

LUBRICATION SYSTEM

Another example of the user-friend-

liness of the IRM rotary meter is the

integration of the lubricating system.

Whereas existing rotary meter

designs require oil changes to be per-

formed at each side of the meter

(variety of drainage/filling points),

the Instromet IRM rotary meter

features a single drainage and filling

plug. The ideally chosen position of

the drainage and filling point ena-

bles the meter to be used in both the

vertical and horizontal flow direc-

tions. All meters with a compact

index or universal index have a lubri-

cation fill and sight glass on the

front.

OPTIONAL FLOW

DIRECTION

The IRM Infinity rotary meter with a

universal index can be installed for

either left, right, top or bottom flow

entry, without changes to the meter

or calibration curve, thus reducing

inventory requirements.

On request both calibration curves

can be provided.

Type IRM-A FLANGED WITH MULTI-

INDEX

Pressure rating : PN 16

Housing material : Aluminium

Max. oper. pressure : 16 Bar

Flanged Connection: PN 16

(Din 2633)

ANSI 125/150

Measurement

range : G16 - G250

(25 to 400m3/h)

Counter mechanism: Multi index

AUTOMATIC INTERNAL

BY-PASS OPTION

Instromet Rotary meters offer an

extremely large range and therefore

are widely used in applications and

installations where gas consumption

may vary from litres per hour to

many cubic metres per hour. All

rotary meters of all manufacturers

may malfunction and block the gas

flow due to external causes, such as

FOD (Foreign Object Damage) or by

installation or application errors. To

guarantee the gas flow, Instromet

offers, as an option, a built-in auto-

matic by-pass which opens at the

occurrence of such a blockage or at a

specified maximum pressure differen-

tial. This option is particularly recom-

mended when an uninterrupted gas

supply is essential (hospitals, factories

etc). The opening of the by-pass valve

can be recorded and signalled by a

pressure differential switch, incorpo-

rating a contact for recording or

memory function.

MATERIALS

Magnetic coupling : Ferroxdure

Meter housing : Aluminium / Ductile / Steel

Meter housing cover : Aluminium / Ductile / Steel

Rotor housing : Aluminium, Hard anodized

Rotors : Aluminium, Hard anodized

End caps of rotor housing : Aluminium, Hard anodized

Rotor shafts : Stainless steel

Counter mechanism head : Aluminium

COATINGS

Meter housing : Synthetic paint, yellow, RAL1004

Meter housing cover : Synthetic paint, yellow, RAL1004

Counter mechanism head : Synthetic paint, white, RAL9001

Flange connection : DIN 2633 ND10/ND16 - ANSI 125 / 150 / 300 / 600

Diameters : 11/2”, 2”, 3” and 4” (40, 50, 80 and 100 mm)

Seals : VITON/NBR

Measuring range : See table

Accuracy : Per approval specifications - generally ± 2% Qmin

to 0.2 Qmax and < 0,5% - 0.2 Qmax to Qmax

Reproducibility : Better than 0.1%

Gas Temperature Range : -20° to +60°

Max. oper. pressure : Aluminium: 16 bar / Ductile: 16 bar

For low and medium pressure applications Instromet uses either extruded alumini-

um bodies or ductile iron. The aluminium is manufactured to DIN 1748. The ductile

iron used, meets a number of standards and is specifically approved for higher

temperatures. Instromet has also developed carbon steel body versions of the

rotary meter for high pressure applications to 100 bar. Specifications and other

information about this unique meter are available on request.

TECHNICAL SPECIFICATIONS

Special High pressure IRM with inte-

grated by-pass and pressure diffe-

rential gauge.

Universal index*

- Counter mechanism with LF

impulse transmitter

(either flow direction)

Compact index *

- Counter mechanism with LF

impulse transmitter

Multi index*

- Counter mechanism with LF or HF

impulse transmitter

TYPICAL CALIBRATION CURVE

MEASUREMENT RANGES / PULSE DATA

The above HF pulse data are approximate values.

** Optional: the LF pulse values can be multiplied by 2, 5 or 10

LOW

Q-MAX. RANGE FREQUENCY HF PULSER

TYPE/UNIT RATED CAPACITY ERROR STARTRATE STOPRATE PULSES m3

RATING m3/h < 10%

at ±1% at ±2% ** 1 pulse/m3Pulse Frequency

per m3/Hz

G 10 16 1:50 1:100 0.04 (1:400) 0,02 (1:650) 0,014 (1:1500) 10

G 16 25 1:80 1:125 0.05 (1:500) 0,03 (1:830) 0,015 (1:1670) 10 8554.68 59

G 25 40 1:100 1:130 0,07 (1:570) 0,060 (1:670) 0,040 (1:1000) 10 5344.75 59

G 40 65 1:120 1:150 0,100 (1:650) 0,060 (1:1080) 0,050 (1:1620) 10 3332.56 60

G 65 100 1:130 1:170 0,150 (1:670) 0,075 (1:1330) 0,050 (1:2000) 10 2141.00 59

G 100 160 1:150 1:250 0,150 (1:1070) 0,075 (1:2130) 0,050 (1:3200) 1 1689.50 75

G 160 250 1:200 1:280 0,200 (1:1250) 0,100 (1:2500) 0,060 (1:4170) 1 802.73 56

G 250 400 1:200 1:300 0,200 (1:2000) 0,200 (1:4000) 0,060 (1:6670) 1 505.74 56

COUNTER MECHANISM MODELS

PRESSURE LOSS

The calibration curve for the G25 IRM Infinity.

Flow rate in %

* HF Impulse transmitter optional

DIMENSIONS AND WEIGHTS

IRM-A G16 .... G100

Compact / universal index

C /U= Compact Index / Universal Index

M = Multi Index

N = Number of bolts

W = Weight (Kg)

Dimensions in mm

IRM-A G16 .... G100

Multi index

INSTALLATION AND

OPERATING INSTRUCTIONS

1. The gas should be clean and dry.

It is recommended that a 5 µ dust

filter be placed upstream the

meter.

2. Check the flow direction.

3. The oil reservoir may only be fil-

led after installation of the

meter. The meter is supplied with

a container of the recommended

oil.

4. Fill the oil reservoir until the oil

level reaches the middle of the

sight glass (meter must be

depressurized).

5. The meter must not be exposed

to vibration.

6. Start-up should be performed

with care, i.e. pressurize the sys-

tem gradually, The flow rate

should never exceed the maxi-

mum meter flow rate.

7 IRM meters are suitable for out-

door installation provided they

are protected against direct cli-

matic effects.

8 The temperature of the gas

should remain within the range

of -20°C to +60°C. The ambient

temperature should preferably

not vary from these values by

more than 5°C upwards or down-

wards.

9. When installing a gauge and/or

pressure recorder for custody

transfer, the location of the pres-

sure reference point Pr should be

carefully noted.

IMPULSE TRANSMITTERS

LF: All IRM Infinity meters are fitted with two low-frequency impulse trans-

mitters in the counter mechanism.

HF: Additionally, a sensor can be fitted on the rotor shaft, which provides a

stable high-frequency signal.

MAINTENANCE

The Instromet IRM rotary meter requires an oil change once every 5 to 10 years,

depending on the service conditions. Checks of the oil level should be per-

formed using the sight glass on the meter. An accuracy indication can be ob-

tained with a simple differential pressure measurement technique.

IRM meters which are fitted with the universal index or the compact index have

the oil level gauge and filler cap on the same end as the index, thus permitting

back-to-wall installation. Those meters with the multi index have the gauge

and filler cap on the opposite end.

HOW TO ORDER

To supply the best meter for your application, please provide us with the follow-

ing information:

1. Capacity in reference volume units and reference conditions.

2. Operating pressure: minimum and maximum

3. Service temperature: minimum and maximum

4. Ambient temperature: minimum and maximum

5. Type of gas

6. DIN or ANSI flanges, or other type of connection

7. Counter mechanism model (compact, multi, universal)

8. Meter type

9. Preferred flow direction.

10. Accessories: Electronic Volume Corrector, LF/HF impulse transmitter, etc.

OTHER OPTIONS

The measured volume can be cor-

rected for temperature alone or for

temperature and pressure by means

of an Instromet electronic volume

corrector, which is pulse driven from

the rotary meter. One or two ther-

mal wells for fitting of temperature

probes can be provided. For high

resolution can be equipped with a

high-frequency output signal in addi-

tion to the standard low frequency

output pulse from the index. G-25 IRM Infinity with Instromet volume corrector

Instromet IRM INFINITY User manual

Brand: Instromet

Model: IRM INFINITY

Type: User manual

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Instromet IRM INFINITY User manual

Instromet IRM INFINITY User manual

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