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Introduction
VCT & VC Multichannel Transmitter
The VCT family of transmitters utilize the latest LED based strobe techniques
using multi-frequency light measurement. The VCT measures Consistency in the
0 to 12%CS range. The VC multichannel measures Consistency on channel one
and one of the following measurements on channel two: Ash, Brightness,
Freeness, Kappa, Fiber Length or Shives Content.
The Remote Display Unit (RDU) provides a local display of the measured values
and serves also as a simple menu-driven calibration and troubleshooting
interface.
The RDU includes two analog 4-20 mA outputs, 3 dry contact binary inputs and
3 contact outputs.
Process Measurement Techniques
The VC family of transmitters measures process parameters by transmitting
multichannel strobes of light into the pulp and measuring the back-scatter characteristics. These
measurement values are calibrated by sampling and laboratory analysis of process and the measurement
accuracy is determined by the accuracy of the laboratory analysis results.
Since the calibration is dependent on sampling and analysis, it is imperative that the sampling techniques
described in the Calibration section are carefully followed.
Installation
Transmitter Installation
The location of the transmitter should be on the high-pressure
discharge of the pump in the turbulent flow. The optimal
location is on a 45-degree angle off the centerline of the
discharge.
Drill a 34 mm diameter hole at 15°angle into the pipe so that
the nipple inserts through the pipe wall. After welding, ensure
that nothing (welding slag) obstructs the insertion path
through the pipe.
Attach the isolation ball valve to the coupling. Once this is
complete and the valve closed, the process can be restarted.
Important: while the process is down, attach the ball valve and
check that the transmitter will insert fully into the pipe and
can be locked in the place with the locking nut.
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