The BLC is a moisture transmitter for continuous operation, mounted straight in the material flow. It measures the water content of wood biomass in real time and delivers it as a 4-20 mA signal that the controller of a boiler, a dryer or a pelleting line reads directly. There are no samples to take and no manual measurements - the device stays in the installation permanently.
Typical positions are biomass boiler houses and wood gasifiers, sawdust and wood chip dryers, pellet and briquette production, and wood-based panel plants.
The manufacturer offers the BLC under two article numbers, matched to the material being measured:
The version is chosen according to what actually flows through the installation.
The sensor goes where the material moves: in the side wall of a bunker or in the floor of a screw conveyor, at a point the screw flights do not pass over. Four holes of 9.0 mm are provided for fixing. The device is rated IP 54, and for outdoor work the manufacturer offers an insulated cover (art. no. 14750).
What matters is that material really flows through the measuring zone - a measurement in a dead corner of the bunker shows the state of the layer sitting there, not of the current batch.
The BLC comes with a display and keypad in the housing as standard. They are used to switch between calibration curves: when the measured material changes, the matching curve is selected directly on the transmitter.
The 4-20 mA output drives the dryingThe water content leaves as a 4-20 mA current signal. The scaling depends on the material measured: 0 to 60 % for sawdust and wood chips, or 0 to 20 % for pellets. An optional second output gives the material temperature scaled from -10 to +70 °C (art. no. 12327). The supply is 24 VDC in the range 18 to 29 VDC, current consumption about 50 mA, permissible load resistance below 500 Ω. Continuous measurement makes it possible to control the process as it runs instead of reacting afterwards: to dry exactly as much as needed, to keep pellet quality constant and not to burn material that is too wet. The manufacturer states a calibration accuracy of ±2.5 % water content. |
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| Parameter | Value |
|---|---|
| Article numbers | 13573 (sawdust and shavings), 15195 (wood chips, pellets and other materials) |
| Measuring range, wood chips and sawdust | 2 to 60 % water content |
| Measuring range, pellets | 2 to 20 % water content |
| Calibration accuracy against the reference material | ±2.5 % water content |
| Temperature measuring range | -10 to +70 °C |
| Operating temperature | 0 to +50 °C |
| Temperature compensation | automatic |
| Power supply | 24 VDC (18 to 29 VDC) |
| Current consumption | 50 mA (without the output) |
| Moisture output | 4-20 mA, scaled 0 to 60 % (sawdust, wood chips) or 0 to 20 % (pellets) |
| Temperature output | optional, 4-20 mA, scaled -10 to +70 °C |
| Permissible load resistance | below 500 Ω |
| Protection rating | IP 54 |
| Operation | display and keypad in the housing as standard, switching between calibration curves |
| Dimensions | 230 × 160 × 93 mm |
| Weight | 3305 g |
| Mounting holes | four, Ø9.0 mm |
| Electrical connection | connecting cable 1.9 m |
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