Optical Process Monitors
Designed to operate with Polestar’s oxygen, pH, and CO2 sensors, the DSP Series Monitors are the core of any Polestar process monitoring system. The DSP Series transmitters include automatic temperature and pressure compensation as will as a proprietary AGC (automatic gain control) to optimize readings and maximize sensor lifespan. The NEMA 12/4X IP 65 enclosure has water-tight cordgrips for brining in process temperature and pressure data via 4-20 mA signals, a simple and intuitive menu, and a high visibility VFD display. The system also offers 4-20 mA isolated loop analog outputs. If desired, process temperature can be monitored using on-board circuitry for PT100 RTDs. By virtue of its rugged design and reliable, long-term measurement performance, Polestar’s DSP Optical Process Monitors are suitable for use in a range of environments, including laboratories, pilot and production plants, as well as outdoors. Applications enabled by the robust, non-electrode design include bioprocessing, food and beverage, high purity water, fuels and biofuels, and environmental monitoring.
Depending upon the sensing chemistry, Polestar’s DSP Optical Process Monitors utilize either fluorescence lifetime (O2) or ratiometric fluorescence analysis (pH, CO2) to measure the parameter of interest. Because they are inherently self-referencing, both of these detection approaches eliminate the potential for measurement error arising from changes in sample turbidity, refractive index, viscosity, or color. This ensures stable, drift-free calibration and hence reliable measurements throughout the lifespan of a sensing element.
Polestar’s sensors, whether incorporated into stainless steel probe configurations, welded onto disposable bioprocess bags, or applied to shake flasks, are solid0-state with no fragile membranes or filling solutions. Unlike electrodes, they exhibit no electromagnetic emissions and can be stored dry.
The DSP Series Monitors are designed for easy installation and operation and may be pipe-, surface-, or panel-mounted, or used on the benchtop. They feature a large easy-to-read four-line VFD display and intuitive menu-driven software. The keypad is ESD and EMI shielded with no double assignment of keys; it is also sealed and washable, and offers positive tactile feedback.
