AB Lorentzen & Wettre Non-contact Moisture Sensors

AB Lorentzen & Wettre Moisture sensors DS

Non-contact moisture sensors

Lorentzen & Wettre’s double-sided, non-contacting measuring sensors (DS) can be fitted on O frames or C frames. Non-contacting measurements is an advantage when measuring the moisture content of multi-ply products such as boxboard and corrugated cardboard, and when measuring coated paper grades. L&W Moisture Sensors DS are the only sensors on the market that can measure moisture content through all the layers of finished corrugated board. L&W Moisture Sensor DS-115C is a new compact measuring head that allows fast traversing of scanning platforms.

L&W Moisture Sensors DS are primarily intended for continuous measurement in on-line installations. They can be fitted on O frames or C frames in order to measure cross-direction profiles or machine-direction profiles. The measurement signals are transferred to a signal processing unit.

L&W Mositure sensor DS-20

      
L&W Moisture Sensor DS-115C

Small and light

L&W Moisture Sensor DS-115 is a moisture sensor with an increased measurement range that covers all types of newsprint, including that manufactured from recycled fibre and containing printing ink residue. It is also perfect for measuring multi-ply material such as boxboard, liner, and coated paper.

To achieve maximum resolution in the control of the cross profile, the measurement area should be as small as possible, therefore, the measurement area of the L&W Moisture Sensor DS-115 is only 40 mm in the cross direction and 60 mm in the machine direction.

80 measurements per second

L&W Moisture Sensor DS-115 has a sampling frequency of 80 measurements per second, which makes it possible to move very quickly across the web. The resolution in the machine direction is excellent, even at high machine speeds.

The head clearance of the meter should be 10 mm. Variations in the head clearance vertically (Z) and laterally (X and Y) are compensated for electronically and mechanically. This means that the mechanical precision of O frames is no longer critical. L&W Moisture Sensor DS-115 can handle variations of up to ±1.5 mm in the Z axis and ±3 mm in the X and Y axes.

The algorithms for calibrating L&W Moisture Sensor DS-115 are the same as those for earlier models.

Use of the microwave resonance method is a guarantee of minimum calibration compared to other measurement methods.

L&W Moisture Sensor DS-155 is inrended for mounting on C or O frames or in a fixed position.

Specifications

  • Small and compact design
  • Light: only 3.6 kg
  • Increased measurement range: 30 g/m² across the entire measurement range 2–70% H2O
  • Small measurement area
  • The measuring signal is taken straight from the sensor, no separate electronics are required outside the measurement frame

Specification
L&W Moisture Sensor DS – Code 842/843

ds-20*
code 842

ds-30
code 842

ds-115
code 843

ds-115c
code 843c






Measurement




Measuring range H₂O

max 600g/m²
2–70%

600 – 1500 g/m²
2–70%

max 70 g/m²
2–70%

max 70 g/m²
2–70%






Instrument




Measuring gap
13 mm
13 mm
7–11 mm ± 1.5 mm dynamical
10 mm
Measuring area
100 mm diameter
100 mm diameter
Oval 40 × 60 mm
Oval 40 × 60 mm
Readout rate
80 mean values/s
80 mean values/s
80 mean values/s
80 mean values/s





Installation requirements

Supply voltage
28V DC
28V DC
24V DC
24V DC
Air flow requirements
0.3 MPa 5 l/min
0.3 MPa 5 l/min

0.3 Mpa 8 l/min
Temperature
70/110 °C
70/110 °C
max 70 °C
max 70 °C

Size

Measuring head
DS-20
DS-30
DS-115
DS-115C





Dimensions
235 × 235 × 295 mm
9 × 9 × 11.6 in
230 × 235 × 290 mm
9 × 9 × 11.6 in
119 × 132 × 213 mm
4.7 × 5 × 8 in
290 × 160 × 200 mm
11.6 × 6.3 × 7.9 in





Net weight
6 kg
13 lb
6 kg
13 lb
3.6 kg
7.9 lb
6.5 kg
14.3 lb

 

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