Valmet OC uses a single light source and measures the reflected/backscattered light from the pulp suspension. The simple and effective installation method enables location close to the dilution point and pump for short dead time and maximized controllability independent of flow. There are no electronic components or other sensitive parts on the probe, making it resistant to high temperatures, pressure and vibrations. The pencil probe has a self-cleaning design to avoid the adherence and accumulation of process substances and eliminates any risk of plugging risk.

The outstanding features of Valmet OC:

– Reliable measurement

– Quick and easy calibration

– Low life time cost

– Simple and safe installation

1. Long experience

Valmet has utilized optical techniques for many years, not only in consistency measurements but also in more advanced analyzers typically used in the pulp and paper industry as well as wastewater treatment. Particularly in low-consistency measurements, optical measurements are frequently the only possible measurement technique to provide reliable results and the Valmet Optical Consistency Measurement (Valmet OC) has gained a deserved reputation for accuracy, reliability and ease of installation. Continued development for applications that have been particularly challenging for optical consistency measurements has expanded the Valmet OC family with measurements optimized forwide range of consistency applications. Besides measuring total consistency, further developments now allow the possibility to measure ash as well.

2. Versatility

Valmet OC measurement combines optimized components and modules tailored for each application, offering the benefits of both HART and Profibus PA technologies. Additionally, it provides seamless integration with asset management systems such as Valmet DNA Field Device Manager. With an operating range between 0–12 %, inline consistency measurement has never been easier.

3. Ash measurement

Valmet OC2R and Valmet OC2W offer the possibility to measure ash in recycled pulp manufacturing applications as well as general stock preparation applications in paper, tissue and board. They share the total consistency measurement method utilized in the original Valmet Optical Consistency Measurement, with the added capability of measuring ash consistency (0-10%) available as a second measured value. The addition of the ash measurement to total consistency opens new possibilities for greater control of stock preparation and wet end processes with all kinds of furnishes from virgin or recycled fiber to mechanical and chemical pulp.

A small profiled process coupling welded to the process pipe ensures that the probe position will be correct without any special tools or measurements. Safe, easy and quick insertion and removal of the probe is provided by a 1/2” ball valve with a safety system that even at a high process pressure makes it quite easy to insert the probe, due to its small size.

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