Vaisala K-PATENTS® SAFE-DRIVE Process Refractometer PR-23-SD

Vaisala K-PATENTS SAFE-DRIVE Process Refractometer PR-23-SD is a heavy-duty, digital refractometer for measuring black liquor dry solids % b.w. and green liquor density or TTA in kraft chemical recovery process.

Vaisala K-PATENTS SAFE-DRIVE Process Refractometer PR-23-SD complete system consists of:

  • Retractable SAFE-DRIVE Process Refractometer Sensor
  • SAFE-DRIVE Isolation Valve
  • SAFE-DRIVE Retractor
  • Steam Wash System
  • Indicating Transmitter

SAFE-DRIVE design allows for safe and easy insertion and retraction of the sensor under full operating pressure without having to shut down the process.
The measurement range covers 0-100 % by weight. The accuracy is typically ±0.1 % b.w. and the measurement is automatically temperature compensated. Low and high concentration alarms can be configured. Because of the digital sensing technology, even large amounts of suspended solids, bubbles or color changes do not affect the measurement or the accuracy.

Each sensor is provided with a calibration certificate comparing a set of standard liquids to the actual sensor output. The calibration and accuracy can be verified on-site with the certified Refractive Index liquids. 

SAFE-DRIVE Refractometer PR-23-SD manuals, safety instructions and safety videos

 

Features
SAFE-DRIVE isolation and retractor tool allows for safe and easy insertion and removal of the refractometer sensor under full process pressure. Easy-to-place and self-retaining design. Triple sealing by two lip seals and an O-ring.
Accidental opening or closing of the isolation ball valve is prevented.
The retractable prism wash nozzle can be safely removed for a service check.
SAFE-DRIVE retractor protects the user from accidental spills during retraction and insertion.
The SAFE-DRIVE sensor is very easy to install to any pipe size (2 inch...24 inch) by welding or via a spool piece (diameter 2 inch...20 inch). Can be mounted either on horizontal or vertical pipelines. Maximum static pressure is 40 bar, maximum operating pressure is 10 bar. Spool piece process connection is DIN-flange PN25/ANSI-flange 150 lbs.
Calibration is identical for any SAFE-DRIVE sensor: Refractive Index (nD) 1.3200 – 1.5300, which corresponds to 0-100 Conc at 100°C (212°F). Therefore, all sensors can be freely interchanged without optical calibration or parameter changes.
Process temperature range: -20° – 170°C (-4° – 340°F)
Dual connectivity: one transmitter can operate two sensors independently. A second sensor can be easily integrated later.
Completely digital system: particles and bubbles do not affect operation or accuracy.
CORE-optics module: no drift, no re-calibration, no mechanical adjustments.
Ethernet connection and remote panel through Internet allow for data-logging and remote operation, e.g. review instrument data and diagnostics.
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Key Benefits

Fully digital and robust system
Vaisala K-PATENTS SAFE-DRIVE Process refractometer PR-23-SD combines advanced CCD-camera technology with a rugged SAF2205 Duplex steel SS sensor probe. The probe is designed for demanding process conditions, high temperatures, pressure and vibration.

The SAFE-DRIVE Process Refractometer PR-23-SD is factory calibrated to measure refractive index nD and temperature T in standard units. Each sensor has identical whole range calibration nD=1.32...1.53 (corresponding to 0-100 %). Because the PR-23-SD sensors have identical calibration, and each sensor gives Refractive Index nD and temperature as output, all sensors can be freely interchanged without any inconvenience of optical calibration or parameter changes.
Easy to install and operate
The SAFE-DRIVE Process Refractometer PR-23-SD Sensor is very easy to install by welding to any vertical or horizontal pipeline with 2 inch or larger diameter. The need for separate spool pieces or pipe sections is minimized. A welding stencil guides the correct welding.

The SAFE-DRIVE is a safety design that consists of a sensor isolation valve and a retractor that allow for safe and easy insertion and retraction of the refractometer sensor under full operating pressure without having to shut down the process.

The refractometer has no lamps or moving parts requiring regular maintenance or recalibration. Users can simply 'install-and-forget', getting a low total cost of ownership.
Accurate and reliable
The SAFE-DRIVE Process Refractometer PR-23-SD measurement is based on unique technology utilizing solid-state optics and a CCD-camera to provide a digital measurement of refractive index. The measurement accuracy is ±0.0002 RI (which corresponds to ± 0.1% by weight).

Because of the digital sensing technology, even large amounts of suspended solids, bubbles or color changes do not affect the measurement or the accuracy.