German VSE flowmeter spot instrument A350-28

German VSE flowmeter spot instrument A350-28

AllFlow meter converter instrumentA350-28Flow meter wiring

Preparation before wiring

Tools and Materials

Prepare a cross screwdriver, wire stripping pliers, insulation tape, and multimeter (for detecting circuit continuity and voltage)

Confirm the flowmeter converterA350-28Match the model of the matching flowmeter and verify the voltage level on the equipment nameplate (e.gDC 24V）Signal type (such as4-20mAPulse signal and interface specifications (such asM12Circular connector or terminal block

Safety precautions

Disconnect the power supply before wiring to ensure that the equipment is in a power-off state and avoid electric shock or damage to the circuit

Check if the insulation layer of the cable is intact, without any damage or aging, and avoid damaging the core wire when stripping

Interface definition and pin description

A350-28Transformers are typically equipped with input interfaces (for connecting flow meter sensors) and output interfaces (for connecting control systems or display devices)

Input interface (flowmeter sensor connection)

pin1（VCC）The positive pole of the sensor power supply is usuallyDC 24V(Consistent with the power supply requirements of the flowmeter sensor)

pin2（GND）Negative pole of sensor power supply/Signal ground, shared with the negative pole of the power supply

pin3（SIG IN）Flow signal input, receiving pulse signals output by flow meter sensors (such asNPN/PNPType) or analog signal (corresponding mode needs to be selected according to the sensor type, set through the converter dip switch)

Output interface (control system connection)

pin4（4-20mA OUT+）Analog output positive pole, connectedPLC/DCSofAIModule positive pole

pin5（4-20mA OUT-）Analog output negative pole, connectedPLC/DCSofAIModule negative pole

pin6（PULSE OUT）Pulse signal output (optional), used for cumulative flow measurement, can be connected to a counter or pulse acquisition module (pulse type needs to be confirmed)NPNOpen collector orPNP）

pin7（ALARM）Alarm signal output (optional, normally closed)/Normally open (configurable), triggered when there is abnormal flow (such as over range, sensor failure), connectedPLCofDImodule

Wiring steps

Connection between flowmeter sensor and converter

step1Thread the flowmeter sensor cable through the waterproof joint and peel off the outer insulation layer (approximately)5cm）Expose the core wire (recommended core wire length)5-8mm）

step2According to the sensor pin definition (refer to the sensor manual), connect the positive terminal of the sensor power supply to the input interface pin of the converter1（VCC）Connect the negative terminal of the power supply to the pin2（GND）Connect the signal output line to the pin3（SIG IN）

step3Use a screwdriver to tighten the terminals, ensuring that the wiring is secure, without looseness or poor contact, and wrap the exposed core wire with insulating tape (if it is a non insulated terminal)

Converter and control system connection

step1Control the system (such asPLCofAIThe module cable is connected to the output interface of the converter,4-20mAPositive terminal pin4, negative terminal pin5If a pulse signal is required, connect the pulse acquisition line to the pin6; Alarm signal line pin connection7(Pay attention to distinguishing between normally open)/Normally closed contacts

step2Confirm the power input of the converter (usuallyDC 24V, PinL+andM）Connect the positive pole of the external power supplyL+Negative pole connectionMPlease note that the polarity cannot be reversed

Grounding treatment

The converter housing needs to be reliably grounded (through grounding terminals or screws), and the grounding resistance should be less than4ΩTo avoid electromagnetic interference affecting signal stability

Wiring inspection and debugging

Line continuity detection

Use a multimeter in the resistance range to check if the wires between each pin are conductive, and eliminate any open or short circuits (such asVCCandGNDThere should be insulation between them, and there should be no short circuit between the signal input line and the ground

Power and signal testing

Connect the power and observe the converter indicator light（POWERThe constant light indicates that the power supply is normal,SIGNALThe flashing light indicates that a traffic signal has been received

Connect the current range of the multimeter in series4-20mAIn the output circuit, check if the no-load current is4mAWhen there is no flow, manually push the impeller of the flowmeter, and the current should increase linearly with the increase of flow20mA(Full scale)

Parameter Configuration

Set the range through the converter button or upper computer software (such as0-100L/min）Signal type (pulse)/Simulate parameters such as flow meters and alarm thresholds to ensure compatibility with flow meters and control systems

Common Problems and Solutions

No signal output

Check if the sensor power supply is normal (pins)1and2The voltage between them should be24V）Whether the sensor cable is connected in reverse or has poor contact; Confirm if the dip switch of the converter is correctly set for the signal type (e.gNPN/PNPSelect)

The output signal fluctuates greatly

Check if the grounding is good and keep away from strong electromagnetic interference sources (such as motors and frequency converters); Check if the sensor is securely installed and if the impeller is stuck

Alarm triggered incorrectly

Re calibrate the alarm threshold to ensure it matches the actual working conditions; Check if there is any malfunction in the sensor (such as impeller wear or blockage), and clean or replace the sensor

Precautions

After the wiring is completed, organize the cables and secure them to avoid pulling and loosening the terminals; Waterproof measures should be taken during outdoor installation to ensure good sealing at the joints

Regularly check whether the wiring terminals are oxidized and whether the cables are aged during long-term use, and maintain them in a timely manner to ensure measurement accuracy

achievableAll A350 -28The correct wiring of converters and flow meters ensures stable transmission of flow signals to the control system, meeting the measurement and monitoring needs in industrial processes

VS0.1GP012V-32N11/4 ‌

‌ VS1GP012V-32N11/4 ‌

‌ VS4GP012V-32N11/6 ‌

‌ VSI0.4/16GPO12V-32W15/4 ‌

Vsi2 / 16gpo54v-32n11 / 4

‌ VSI0.04/16EPO12E42R11

German VSE flowmeter spot instrument A350-28

KRACHT Clark from Germany provides on-site selection and technical support for flow meters and indicators, and has competitive purchasing prices for gear pumps, valves, and spare parts

VSE Germany (flowmeter provides project selection and technical support)

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