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MWM - WLM-Sensor - Flow Metering System
The flow measurement of the WLM-Sensors is based on magnetic inductive principle. A coil produces an alternating magnetic field which induce a tension equivalent to the flow speed. The proven methodology is characterized by high accuracy and long-term stability. The most important factor is the ability to measure lowest flows. MARTINEK put special emphasis on this which enables the WLM-Sensor to measure flows as low as 1cm/s significantly which is especially important in the mostly oversized networks. The WLM-Sensors are working independent from the pipe dimensions as well as its material and can be installed under pressure without interrupting the network (hot tapping). Of course, all flow sensors can be equipped with additional pressure, noise and temperature sensor. The various interfaces enable the WLM-Sensors to be connected to all SCADA or data loggers.
Mechanical data
- Housing dimensions: : D = 5/4 inch
- Length: : 340-990mm
- Weight: : 0.5kg without cable
- Cable: : 5m (waterproof)
- Protection class: : IP68
- Probe material: : stainless steel 1.4571
- Probe head: : plastic PAS-L
- Ambient temperature: : -10 - 40°C
- Storage temperature: : -30 - 60°C
- Medium temperature: : 0 - 60°C
Data storage
- Sensor interface: : RS232, 4-20mA (optional)
- Measuring interval: : 1 sec. (from 1sec. to 1hour)
- Storage interval: : 1 minute (from 1sec to 1hour)
- Calculation value: : current, min, max, average
- Memory size: : up to 154,000 values
- Data output: : RS232, 4-20 mA, Modbus (RTU/TCP)
- Data transmission: : GPRS, GSM, Analog, Ethernet
Flow measurement
- Measuring principle: : magnetic inductive
- Flow velocity: : 0.01 - 9.99m/sec
- Resolution: : 0.001m/sec
- Flow direction: : bidirectional
- Medium: : minimum conductivity 50µS
Pressure measurement
- Measuring principle: : piezo resistive ceramic technology
- Membrane: : ceramic
- Measuring range: : 0 - 16bar
- Overpressure: : up to 30bar
- Accuracy: : typ. +/-0.25% FS
Noise measurement
- Measuring principle: : piezzo electric-polymer sensor
- Frequency range: : 8 - 3500Hz
- Output: : analog (correlator), digital
Water temperature measurement
- Range: : 0 - 60°C
- Accuracy: : typ. +/-0,25°C
- Measurement position: : probe head
Connection data
- Power supply: : 110-240VAC, battery, solar
- Pipe material: : all pipe materials
- Pipe diameter: : 80-2000mm