Voltage preamplifier PHA series

measuringbipolartemperature

COMECOs PHA preamplifier amplifies the voltage from pH or REDOX potential (ORP) probes through a special amplifier that serves as input buffer and provides the high input impedance necessary for normal operation of pH/ORP probes. The low impedance output of the preamplifier may be connected to a standard indicator, data logger, or controller. Two PHA variants are available: - variant 100 with low IP protection class that needs bipolar supply voltage; - variant 150 with high IP protection class and single polarity supply voltage. PHA100 serves only as a high input impedance buffer; no change of voltage signal is performed. PHA150 shifts input signal so that the output voltage has single polarity (its polarity does not change), and allows temperature compensation measurement via an additional Pt100 input. Variant 150 is designed for wall mounting, while PHA100 is to be either left to hang freely on its wires or mounted by the means of a bracket. Both variants are applicable in cases in which there is a need to connect pH/ORP probes to measurement devices without posing special requirements to devices input circuits and connection cables. The fields of application include biotechnological, chemical, food, and other industries, and research.