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| After-sales Service: | Online Instruction |
| Warranty: | 1year |
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A.[Features of thermal mass flowmeter]
Convenient and accurately measuring
The thermal mass flowmeter can measure the gas flow rate without temperature and pressure consumption;
Large ratio of measuring range
The Hot Sale And Loner Warranty Period Nitrogen Gas Flow meter could measure gas with velocity of flow from 100Nm/s to 0.5Nm/s
Good performance and longer working life
The digital thermal mass flow meter with good anti-seismic performance and longer working life,the transmitter don't cantain movable part and pressure sensor,
High Qulaity Material
The Hot Sale And Loner Warranty Period Nitrogen Gas Flow meter with high quality stainless steel 304 material or ss316 optional
B.[Parameters]
| Production Name | Thermal mass flowmeter |
| Medium | all kinds of gas |
| Diameter | DN20~DN2000 |
| Flow rate | 0.5~100Nm/s |
| Accuracy | 1.0%;1.5% |
| Temperature | Sensor:Ambient temperature:-10~200ºC |
| Max temperature:10~350ºC | |
| converter: 10~45ºC | |
| Pressure | Medium pressure≤4.0Mpa |
| Power supply | Integrated:DC24V or AC220V≤180W |
| Splited:AC220V≤19W | |
| Feedback speed | 1s |
| Output | Standard output:4~20mA;Can customized for RS485 |
| Material | Stainless steel 304 material |
| Display | LCD Display |
| Display | mass flow;volume flow;total flow;time;temperature;standard flow. |
| Protection class | IP67 |
| Converter material | stainless steel material |
1.Flow range
| Item | The thermal mass flow meter flow range table |
| Diameter | Flow range (Nm3/h) |
| DN20 | 1.2~120 |
| DN25 | 2.5~168.5 |
| DN32 | 4~275 |
| DN40 | 6~430 |
| DN50 | 9~671.5 |
| DN80 | 20~1718.5 |
| DN100 | 30~2685 |
| DN150 | 60~6045 |
| DN150 | 60~6045(plug-in) |
| DN200 | 120~12738.5(plug-in) |
| DN250 | 150~18779(plug-in) |
| DN300 | 200~28000(plug-in) |
| DN400 | 350~48955.5(plug-in) |
| DN500 | 600~77177.5(plug-in) |
| DN600 | 800~100000(plug-in) |
The common problems and solutions of thermal gas mass flow meters are as follows, classified by fault type:
1, Display Exception
No display or black screen
Reason: Power failure (power outage, unstable voltage), internal circuit damage, loose or damaged display screen pins, DC24V power supply polarity reversed.
Solution: Check the power connection and voltage stability; Confirm that the positive and negative poles of DC24V are correct; Re insert the display screen pins or replace the display screen; Contact the manufacturer to repair the circuit.
Instantaneous flow anomaly (large fluctuation/zero display)
Reason: reversed probe direction, dirty or damaged sensor, incorrect parameter settings (range/filtering coefficient), flow field disturbance (insufficient straight pipe section, valve interference).
Solution: Correct the direction of the probe; Clean or replace sensors; Check the flow rate parameters and filtering coefficients; Ensure that the upstream straight pipe section is ≥ 5D (pipe diameter) and away from valves/elbows.
2, Measurement accuracy issue
Large reading deviation
Reason: Changes in gas composition, fluctuations in environmental temperature and pressure, sensor contamination, improper installation location (not in the center of the pipeline/liquid accumulation).
Solution: recalibrate the instrument; Clean the sensor; Adjust the installation position to the center of the pipeline; Vertical pipelines prevent misjudgment of airflow direction.
Abnormal 4-20mA output
Reason: Range setting error, wiring loop issue, converter failure 9.
Solution: Verify the range configuration; Check the wiring and eliminate interference; Contact the supplier to repair the converter.
3, Response performance issues
Slow response speed
Reason: Sensor aging, internal processing delay.
Solution: Replace the sensor; Upgrade the instrument firmware or hardware.
Unstable flow control (fluctuation)
Reason: Low or unstable air source pressure, loose circuit connectors, and faulty regulating valves.
Solution: Stabilize the gas source pressure; Tighten circuit connectors; Repair or replace the regulating valve.
4, Installation and maintenance issues
Installation errors leading to malfunctions
Error type: Reverse flow direction (probe arrow does not match airflow), insufficient straight pipe section (<5D), misjudgment of airflow direction in vertical pipeline.
Consequence: Negative flow display, error exceeding ± 15%.
Correction: Install strictly according to the flow direction markings; Ensure the upstream straight pipe section; Confirm the airflow from bottom to top in the vertical pipeline.
Sensor blockage or contamination
Prevention: Clean the pre filter monthly; Blow dry nitrogen in both directions for at least 30 minutes during shutdown.
5, Environmental and operational requirements
Temperature and humidity influence
Requirement: Environmental temperature -20 ºC~55 ºC; Avoid high humidity environments (which may cause the probe to become damp).
Operation taboos
It is prohibited to install/remove non plug and unplug probes under pressure;
Avoid sudden valve opening causing flow shock;
Disable compressed air blowing instrument.
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