Current position > News detail
『Flow meter pulse signal』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. How to convert pulse signal into flow rate
The method of converting pulse signal into flow rate usually involves determining the instrument coefficient of the flowmeter, and then converting the pulse signal into a flow rate value based on this coefficient. Specific operation process: Measuring pulse signal: It is necessary to measure the pulse frequency and number of pulses of the pulse signal. Pulse frequency represents the number of pulses emitted per unit time, while pulse count represents the total number of pulses emitted over a period of time. This is usually done using specialized electronic counters or frequency meters to ensure the accuracy of measuring the obstruction. Determine the instrument coefficient: The instrument coefficient is a key parameter that represents the fluid volume or mass corresponding to one pulse output by the flowmeter. This coefficient is usually calibrated by the flowmeter manufacturer at the time of leaving the factory and will be indicated in the product manual or nameplate. Calculate flow value: Calculate the flow value based on the measured pulse frequency or number of pulses and instrument coefficient. The specific conversion formula is: flow value=(pulse frequency or pulse number/instrument coefficient) x unit conversion coefficient. Among them, the unit conversion factor is used to convert the calculation results into the required flow rate units, such as cubic meters per hour, liters per minute, etc. Using a flow integrator (optional): For the pulse output of gas flow meters, flow conversion can be performed using specific conversion formulas. But in order to simplify the operation process and improve measurement accuracy, a flow integrator can be used. The flow in
2. How to read the pulse signal of the flowmeter
The reading method of the pulse signal change crack number of the flowmeter mainly depends on the type of signal and the reading equipment used to read it. The core is to convert the flow value by counting the pulse frequency or quantity.
.Firstly, signal type recognition requires confirmation of the electrical characteristics of the flowmeter pulse output.
1. Open collector circuit (NPN/PNP): The most commonly used and requires external power supply (usually 12-24VDC), with a level jump during the pulse (NPN pulse pulls down to 0V, PNP pulls up to the supply voltage).
Voltage pulse: Directly output 5V/12V/24V level pulses 3. NAMUR: Intrinsic safety type, to be used in conjunction with isolation barriers 4 Relay contacts: mechanical contacts for on/off, no polarity requirements but low frequency2. Hardware connection scheme: Select the matching reading device according to the signal type: • PLC high-speed counter: the most commonly used scheme, supporting frequencies above 100kHz (such as HSC of Siemens S7-1200) • Pulse collection module: RS485/Ethernet pulse module (such as Advantech ADAM-4080) can be selected for IoT applications • Single chip microcontroller acquisition: Arduino/STM32 reads through interrupts or external counte