The MF-P-HTD is a sensor that measures the moisture of paper, board and pulp sheets while they are being produced. It is mounted above the web and reports the absolute water content and the material temperature in real time - no sampling, no stopping the machine, no contact with the product.
The reading does not depend on web speed, so the same sensor measures material standing still and material running along the line, on a corrugator for instance. The value reaches the control room over the selected interface and serves both to document quality and to control humidification or drying.
How the sensor measuresWater content is determined by a high-frequency capacitive measurement, and the material temperature by a built-in infrared sensor. The temperature reading is not a separate extra function: it is what compensates the moisture result, because warm and cold paper with the same water content give a different signal. The measuring field of the infrared sensor lies just ahead of the moisture measuring field, so both refer to the same spot on the web. |
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Basis weight decides the choice: MF-P-HTD or MF-S-HTDBoth sensors share the same housing, the same measuring range of 1 to 20 % water content and the same interfaces. What separates them is the basis weight of the material:
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The sensor is ordered together with an interface, because the interface decides how it is powered and how the data reaches the control room:
Operating status at a glanceThere is a button and two LEDs on the front of the sensor. Operation on the line comes down to a single glance: green says the sensor is running and delivering a reading, red says it needs attention. The operator does not have to walk back to the control room to check whether the measurement is running at all. |
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Moisture profile across the full web widthMounted on a traverse, the sensor travels across the web and records the moisture profile over its whole width. That shows not only the average but whether one edge is drying faster than the middle - the most common cause of waving, curling sheets and complaints. |
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The sensor converts the signal into water content using a curve developed for the given product. The curve is produced by the manufacturer’s laboratory from samples supplied by the customer - five A4 sheets of each type are needed. Art. no. 13762 covers one type of paper in one basis weight, art. no. 15316 the same material in up to three basis weights.
HumiSenseWare is PC software written for these sensors. It shows the values in real time, converts them into moisture, runs the calibration of paper types and manages the measurement data. The standard licence is art. no. 14715 and requires the Modbus TCP interface (art. no. 14436). The extensions cover the function range of the LF-TD series, a Modbus interface, a TCP/IP ASCII interface, customer interface integration and a package for adding three further sensors.
Advantages
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| Measuring range | 1 to 20 % water content (depending on the material) |
| Basis weight range | 80 to 500 g/m² |
| Material temperature | 0 to +100 °C |
| Ambient temperature | 0 to +70 °C |
| Temperature measurement | infrared sensor, automatic compensation |
| Power supply | Power over Ethernet, or 12 to 28 VDC with the analogue output |
| Dimensions | 242 × 233 × 120 mm |
| Weight | 4.9 kg |
MF-P-HTD sensor with the paper temperature sensor and the web guide rollers. The interface is ordered separately.
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