humimeter BLO - online wood chip moisture measuring system

Continuous wood chip moisture measurement in the line

The BLO measures the water content of material passing along a conveyor - with no sample taken and no operator. The result goes to two 4-20 mA outputs, one for moisture and one for temperature, so the controller of a boiler or a dryer works on a current figure.

The system consists of an analysing unit and a sensor matched to the mounting position. Without a sensor the device takes no measurement.

Sensors required for the system to work

Art. no.	Picture	Description and measuring range
12122		Sensor for mounting in a screw conveyor. Range 10 to 55 % water content, corresponding to 120 % wood moisture. Determination temperature 0 to +70 °C. Minimum compaction pressure of 20 N/dm² required. Also covers wood shavings, chaff and miscanthus. 5 m cable.
12470		Sensor with a compressing construction, for positions where the material is loosely packed. Range 10 to 55 % water content, resolution 0.5 %. Determination temperature 0 to +70 °C. Minimum compaction pressure of 20 N/dm² required. Also covers shavings, chaff and miscanthus. 5 m cable.
15222		Universal sensor for wood chips, pellets, sawdust and other materials. Range 2 to 60 % water content, corresponding to 150 % wood moisture - the widest of the three. Determination temperature 0 to +70 °C. 5 m cable.

The choice depends on how firmly the material is pressed against the face of the sensor. Where a screw compacts it by itself, the 12122 is enough. Where the material passes loosely, the compressing construction 12470 is needed. The universal sensor 15222 covers the widest range and adds pellets and sawdust.

Your benefits continuous measurement, with no samples taken and no operator two analogue 4-20 mA outputs: water content and material temperature factory calibrated system for the standard sensors calibration accuracy ±2.5 % against the reference material automatic temperature compensation and automatic averaging logger with the measuring point description, supplier details and batch number aluminium housing rated IP 54 can be extended with an Ethernet module and visualisation software

Technical data

Scope of delivery

• BLO analysing unit
• connecting cable 1.9 m long with a five-pin moulded connector
• two analogue 4-20 mA outputs for water content and temperature

The sensor is not part of the set - it is chosen separately from the table above.

Checking the readings The manufacturer recommends comparing the readings periodically with the oven method. For a quick check there is the test block art. no. 12308, listed in the price list for the BLO and for the sensors 12122 and 12470.

Extended accessories

• Art. no. 12215 - 100-240 VAC power supply as an option
• Art. no. 13428 - Ethernet module with an RJ45 socket, built into the analysing unit
• Art. no. 14733 - HumiSenseWare, standard Live Trend licence: water content, temperature and dew point in real time, a scalable graph and export to Excel. For up to three sensors, only together with art. no. 13428
• Art. no. 14734 - HumiSenseWare, data management and logging option
• Art. no. 14713 - HumiSenseWare, extension package for three more sensors
• Art. no. 15359 - protective plate for the universal sensor 15222, spare part
• Art. no. 12308 - test block for checking the readings

BLO or HGT-A

The HGT-A is a single instrument: sensor and electronics in one housing, mounted straight into the wall of the conveyor, factory calibrated for wood chips and accurate to ±5 %. The BLO is an analysing unit with a separate sensor - it costs more and needs room for the unit itself, but it is accurate to ±2.5 %, has a display with a logger on the spot and a choice of three sensors, including the universal one that covers pellets and sawdust.