Paper moisture measured on the reel, without stopping the machine
The humimeter PM5 is a handheld meter that determines the absolute water content of paper and board on a running reel - with no sample cut out, no drying oven and no waiting for a laboratory. The sensor bars are pressed against the outer surface of the reel - the smooth circumference, not the flat end where the edges of the layers show - and the result is read off. The same meter also measures paper and board in stacks.
It is made for paper producers, converters and traders: for checking incoming goods, for supervising the process and for settling complaints. It measures a warm reel straight off the machine as well as a reel that has cooled down in the store.
Why measuring a warm reel is difficult
The water content of paper depends on its temperature, and a reel coming off the machine is often considerably warmer than its surroundings. The PM5 measures the paper temperature without contact, by infrared with 90 degree optics, and takes it into account in the result. That is what makes a reading from a warm reel comparable with one from a cooled reel.
The measurement reaches 50 mm deep, so the result describes a layer of paper rather than the outermost sheet alone.
How a measurement on a reel is taken
- Switch the meter on. It asks for the automatic adjustment straight away: hold it by the handles up in the air, with at least 0.5 m of free space behind the sensor bars, and confirm.
- Select the calibration curve by paper density - you work it out from the grammage and the sheet thickness. The meter has 24 curves from 200 to 1600 kg/m³.
- Press the meter with a force of about 4 kg against the outer surface of a reel with a radius of at least 100 mm, so that all three sensor bars rest firmly on the paper. Do not place the bars on the flat end of the reel where the edges of many layers show - such a reading is not reliable.
- Read the result from the backlit display - the water content and the paper temperature appear at once.
- Move the meter along the reel to find sections that are too wet or too dry and to work out an average. On a rotating reel the meter can log a reading every 3 seconds.
- Store the readings together with the measuring point description.
Measuring a stack of paper or board
The PM5 also measures paper and board in stacks. The stack must be at least 50 mm high and the sheets at least 150 × 150 mm. The meter is pressed with about 4 kg onto the top surface of the stack, away from the edges - readings near the edges are not reliable. Several readings at different points give a reliable average.
What the PM5 does not measure
- metallised paper and paper containing graphite,
- corrugated board - use the humimeter RH5 for it,
- single sheets,
- electrostatically charged, rotating paper reels.
Metal and other conductive materials within the measuring range disturb the result.
For paper outside the factory curves the manufacturer creates a characteristic of its own from a sample you send in and converts the absolute water content into relative paper humidity (art. no. 12496).
Your benefits
- Measurement on a running reel, without stopping the machine and without damaging the goods.
- Paper temperature compensated from a non-contact measurement - a reading from a warm reel is comparable with one from a cold reel.
- Measuring depth 50 mm, so the result comes from a layer, not from the surface.
- Result in seconds, with no sample preparation.
- Measurement on reels and in stacks of paper and board.
- Logger for 10 000 readings, automatic and manual, with the measuring point description.
- USB interface with the LogMemorizer software included - at no extra charge.
- Case with a test plate lets you check the calibration yourself every four weeks.
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Technical data
| Parameter |
Value |
| Measuring range |
1 to 25 % water content |
| Resolution |
0.1 % water content |
| Measuring depth |
50 mm |
| Minimum material thickness |
50 mm |
| Calibration curves |
24 curves by paper density, from 200 to 1600 kg/m³, plus the Reference curve for the test plate check |
| Paper temperature measurement |
non-contact, infrared, 90° optics |
| Paper temperature when determining water |
0 to +80 °C (32 to 176 °F) |
| Temperature measuring range |
-25 to +125 °C (-13 to 257 °F) |
| Temperature compensation |
automatic |
| Temperature unit |
°C or °F, selectable |
| Memory |
hold function, automatic and manual logger for 10 000 readings with a measuring point report |
| Display |
backlit 128 × 64 dot matrix display |
| Dimensions |
254 × 138 × 70 mm |
| Weight |
850 g (with the rechargeable battery) |
| Power supply |
lithium-ion rechargeable battery 1800 mAh, 60 to 100 hours of operation, charging via USB up to 6 h |
| Storage temperature |
-20 to +60 °C |
| Protection class |
IP 40 |
| Menu languages |
English, German, French, Italian, Spanish, Portuguese, Czech, Russian, Polish and international |
| Article number |
13800 |
Scope of delivery
- humimeter PM5
- USB interface module with the LogMemorizer software and a USB cable for the PC
- lithium-ion rechargeable battery
- case with a test plate for checking the calibration yourself
The USB module is part of the set, so there is nothing to buy separately.
Extended accessories and services
- Art. no. 14944 - internal Bluetooth 5.0 module with the LogMemorizer software
- Art. no. 11909 - LogMemorizer PRO, annual licence with cloud access. Requires the USB or Bluetooth interface
- Art. no. 12297 - loading an available characteristic (calibration) curve into the device
- Art. no. 11217 - laboratory analysis to prepare a calibration curve for a new material for humimeter devices
- Art. no. 12496 - laboratory analysis to prepare a calibration curve for the customer’s material for the humimeter PM5 and to convert absolute water content into relative paper humidity (max. 0 to 100 %). Please state the measuring range required.
- Art. no. 15444 - thermal printer with rechargeable battery (USB-C version), portable serial printer for humimeter devices with a USB interface
- Art. no. 10600 - factory calibration certificate, a protocol documenting the calibration of material moisture meters before delivery
- Art. no. 14098 - spare parts set: 3 sensor bars for the humimeter PM5
Polski