Product overview
LLQ series gas waist wheel flowmeter is an instrument for accurate measurement of gas flow. Based on the principle of volumetric measurement, it is used to accurately measure the total amount of gas flowing through the closed pipe. The basic type of flowmeter is composed of two parts: waist wheel flow sensor and flow totalizer (secondary meter)< br />
Measurable gas < br / >
It is suitable for measuring non corrosive gases such as natural gas, city gas, propane, nitrogen and industrial inert gas< br />
Main applications < br / >
It can also be used as standard flow meter for gas commercial settlement in catering, hotel and other industries, gas metering in transmission and distribution network, gas metering in gas pressure regulating station, gas metering in industrial and civil boilers, etc.
 
Product features
High precision and good repeatability. The internal rotor is precisely processed and balanced, no contact rotation, good oil lubrication, to ensure the accuracy of the flowmeter unchanged, long working life;
There is no need for straight pipe before and after the flowmeter, so it can be installed in narrow environment;
Small initial flow and wide range ratio are suitable for measuring gas flow with large load variation;
Measurement accuracy is not affected by pressure and flow changes, stable performance and long service life
All roots flow sensors can use universal accessories;
It is equipped with RS-485 communication interface and special signal concentrator to form a remote data acquisition and monitoring system through GPRS / CDMA, Internet and telephone network, which is convenient for centralized data acquisition and real-time management;
The circuit adopts surface mounting technology, compact mechanism, strong anti-interference ability and high reliability;
Using high performance microprocessor and modern digital filtering technology, the software has powerful function and high reliability;
It adopts floating-point operation and five section instrument coefficient automatic correction, and has the function of fault self diagnosis and alarm;
Adopting micro power consumption high technology, internal and external power supply, low power consumption;
Local display of flow value, with a variety of signal output functions;
High contrast liquid crystal display is adopted, which can display standard cumulative flow, standard volume flow, percentage of working condition volume flow, medium temperature, pressure value and percentage of battery capacity with Chinese prompt;
It has the function of real-time data storage, which can prevent the data loss when the battery is replaced or the power is suddenly turned off. In the power failure state, the internal parameters can be permanently saved;
The instrument has explosion-proof function, and the explosion-proof mark is Exia Ⅱ cT4;
The protection grade of flowmeter shell is IP65.
 
technical parameter
Executive standard
Gas waist wheel flowmeter JB / T 7385-1994
Verification regulation
Gas volumetric flowmeter jjg633-2005
Nominal diameter
25mm~250mm
Accuracy class
± 1.5%R、± 1.0% R (to be customized)
Withstand voltage level
1.0MPa
Working power supply
Dc3.6v lithium battery (1 set)
Overall power consumption
Average power consumption & le; 6MW, sleep state, power consumption & le; 1.8mW
Data storage function
Start stop record, diary record, fixed time interval record, etc
Conditions of use
Medium temperature
-20℃~+80℃
relative humidity
5%~90%
ambient temperature
-30℃~+60℃
atmospheric pressure
86Kpa~106Kpa
Instrument material
Body
Aluminum alloy or cast iron
converter
Cast aluminum
Lumbar chakra
aluminium alloy
Bearing
Cemented carbide
Protection level
IP65
Explosion proof grade
Exia Ⅱ cT4 (intrinsically safe)
Comply with relevant parts of GB 3836.1-2000 electrical apparatus for explosive gas atmospheres Part 1: General requirements and GB 3836.4-2000 electrical apparatus for explosive gas atmospheres Part 4: intrinsically safe type; i” 》 Standards.
 
measuring range
Nominal diameter (mm)
Flow range & nbsp< br />
m3/h
Initiating flow & nbsp< br />
m3/h
Maximum pressure loss & nbsp< br />
Pa
Nominal pressure & nbsp< br />
Mpa
Accuracy class%
Range ratio
texture of material
twenty-five
0.8-16
zero point zero five
one hundred and twenty
one
1.0、1.5
20:1
aluminium alloy
twenty-five
1-20
zero point zero five
one hundred and twenty
one
1.0、1.5
20:1
aluminium alloy
forty
1.5-30
zero point zero seven
one hundred and thirty
one
1.0、1.5
20:1
aluminium alloy
forty
1.5-40
zero point zero seven
one hundred and eighty
one
1.0、1.5
30:1
aluminium alloy
fifty
1-60
zero point zero seven
one hundred and eighty
one
1.0、1.5
60:1
aluminium alloy
fifty
1.2-85
zero point zero seven
two hundred and ten
one
1.0、1.5
70:1
aluminium alloy
eighty
1.4-100
zero point zero seven
two hundred and twenty
one
1.0、1.5
70:1
aluminium alloy
eighty
1.2-140
zero point zero eight
two hundred and twenty
one
1.0、1.5
120:1
aluminium alloy
eighty
2.9-200
zero point one five
two hundred and twenty
one
1.0、1.5
70:1
aluminium alloy
one hundred
3.1-250
zero point one one
two hundred and forty
one
1.0、1.5
80:1
aluminium alloy
one hundred
2.7-300
zero point one one
two hundred and eighty
one
1.0、1.5
110:1
aluminium alloy
one hundred
4.1-450
zero point one one
three hundred
one
1.0、1.5
110:1
aluminium alloy
one hundred
4.5-500
zero point one one
five hundred and forty
one
1.0、1.5
110:1
aluminium alloy
one hundred and fifty
8.1-650
zero point six five
five hundred and eighty
one
1.0、1.5
80:1
cast iron
one hundred and fifty
10-800
zero point seven six
five hundred and ninety
one
1.0、1.5
80:1
cast iron
one hundred and fifty
12.5-1000
zero point seven six
six hundred
one
1.0、1.5
80:1
cast iron
one hundred and fifty
13.3-1200
zero point seven six
seven hundred
one
1.0、1.5
90:1
cast iron
two hundred
31-1600
one point one five
six hundred and fifty
one
1.0、1.5
53:1
cast iron
two hundred and fifty
75-3000
eight
four hundred and fifty
one
1.0、1.5
40:1
cast iron
 
Product classification
Instrument model
LLQ
LLQZ
signal output
nothing
Pulse signal, IC card controller output signal & nbsp< br />
4-20mA
Power supply
+24VDC± 15% or lithium battery
+24VDC± 15% or lithium battery
Accuracy class
Grade 1.5-1.0
1.5～1Grade 1.0
measuring range
Standard range
Standard range
monitor
nothing
yes
Temperature and pressure compensation
nothing
yes
communication interface
nothing
RS-485
Real time recording
yes
yes
Instrument material
Aluminum alloy or cast iron
Aluminum alloy or cast iron
Explosion proof grade
ExiaIICT4
ExiaIICT4
Protection level
IP65
IP65
Overall power consumption
< 1W
< 1W
Instrument thoroughfare
DN25～DN250
DN25～DN250
Installation method
Vertical installation
Flange installation
Medium temperature
-20℃～80℃
-20℃～80℃
 
On site cases




Installation and use in catering industry
Application in natural gas measurement
Field installation in engineering gas
Welding requirements in industrial measurement