PCE-MWM 240-B VHF-Band Sensor / continuous moisture measurement in bulk (tank / silos)
Designed specifically for use in humidity measurement of bulk material, this moisture sensor is installed in bins, silos, troughs, bunkers case, distributors, screw conveyors and on conveyors. Material in bulk or flowing mass, such as dyes, gravel, sawdust, fly ash (mineral), wood chips (surface to 5 cm) feed grain, flour, seed, pastes, ... is smoothly and continuously measurable in the process.
in this humidity sensor, the
measuring principle is based on the use
of waves in the VHF
unit used for measuring moisture consists
of an electronic box and the moisture sensor
sensor part is
manufactured in two versions. Both are
made of AISI 321 stainless
steel (tube diameter 15 ... 30mm), but differ in their structural
Variant 1 (PCE-MWM 240-A): Bow sensor (length 200 mm)
The bow shape makes it extremely robust against shocks and mechanical abrasion. It is fastened by means of adapters on the wall of tanks and silos.
Variant 2 (PCE-MWM 240-B): Rod sensor (length 500 ... 1500 mm)
It is attached like a connecting strut between two container walls.
Variant 3 (PCE-MWM 240-C): Bow sensor (length 200 mm)
A bow sensor that is designed specifically for high conductivity materials like iron ores, coal, and other metals.
Both sensor types require a perfect cover with bulk (100mm) in order to ensure a high measurement accuracy. For this reason, the rod sensor is often installed in case hoppers. On the bow shaped sensor additional guiding plates provide sufficient coverage with the material to be measured. Regulation of the speed of a conveyor belt may also be sufficient to always keep a sufficient cover on the humidity sensor. This is particularly important to keep the density of the material to be measuredas even as possible.
|Measuring range||0 ... 100 %|
|Maximum permissible error (absolute)||Verified by lab tests|
|Operating temperature range||0 ... +80 °C|
|Working mode||continuous operation|
|Measuring rate||1 s|
|Power supply||24 VDC|
|Current consumption||200 mA|
|Warm-up time (start-up)||30 min|
|Outputs||RS485 (Modbus RTU), 4-20 mA|
[RS485: max. cable length 1000 m; 4-20 mA: max. length 100 m (max. length up to SPS)]
|Inputs||2 x digital 24 VDC|
|Dimensions rod sensor||L 500 ... 1000 mm, 15 ... 30 mm dia.|
|Dimensionsbow sensor||L 200 mm, 15 ... 30 mm dia.|
|Dimensions (electronics unit)||255 х 170 x 60 mm|
|Protection (electronic unit)||IP54|
|Rod sensor||2 ... x kg (depending on the length)|
|Bow sensor||3 kg|
|Electronics unit||2 kg|
Please note that we will need further information to provide a final price for supply and fit. We will need to know what materials are to be measured, we will need samples of the material, and we will need a technical drawing showing where the sensor is to be installed.