3 Valmet Optical Consistency Measurement – Valmet
OC2R
Valmet Optical Consistency Measure-
ment – Valmet OC2R measures the total
and ash consistency of pulp based on the
amount of light reflected from the pulp.
The system uses a LED light source
which in practice does not wear in use.
Predefined linearization curves for differ-
ent pulp types enable easy calibration of
the measurement signal and facilitate the
setting up of the measurement.
The calibration curve is adjusted to the
process conditions by means of single-
point or two-point calibration. When
measuring ash-containing pulps, multi-
point calibration is applied to perform
compensation calculations that take into
account the variation of ash content in
the total consistency. Multi-point calibra-
tion is also used for ash consistency cali-
bration.
3.1 Operating unit (TCU)
TCU is the user interface, power supply and calculation unit of the system. The device
is operated by using the TCU keypad and four-line display. The TCU is mounted on a
protective cover which protects it from falling dirt, water, pulp, etc.
The TCU has the following connectors:
• sensor cable, sensor power supply and RS485 serial port;
• 4–20 mA current output (passive) to mill DCS;
• digital communication using HART
®
protocol;
• RS232 connection for a PC (for service purposes);
• mains voltage;
• binary inputs for recipe selection and sampling status.
Valmet Optical Consistency Measurement – Valmet OC2R | 7 (48)
K20798 V1.1 EN - 1 - 12/2019
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