pH/ORP Preamplifiers

The NEWPORT® PHAMP Series Preamps are unity gain preamplifiers which convert the high impedance mV signal of a pH or ORP electrode to a low impedance signal which can travel 1,000 feet over ordinary wire and connectors not only to pH meters and controllers which are designed with high impedance input circuitry, but also to Process Meters and Controllers such as the iSeries which can not otherwise register the high impedance signal. In many applications the PHAMP series Preamps will also extend the useful life of expensive pH electrodes, lowering the output impedance of an aging electrode allowing it to continue providing a measurable signal.

The PHAMP-1 is powered by lithium batteries with an estimated life of 5 years when used with high input impedance instruments. The electronics are entirely encapsulated in an epoxy filled stainless steel enclosure. The input and output connections are industry standard BNC. The output can be split from coaxial to separated leads with the 3073 adapter.

The PHAMP-2 is a 10-40 volt dc powered preamp which can be powered by the excitation of a process meter or the optional power supply. The electrodes are entirely encapsulated in a compact epoxy filled enclosure designed for easy mounting in a manufacturing process. The PHAMP-2 offers redundant outputs from either a BNC connection, terminal strip or both at the same time.

The PHAMP-3 is the same as the PHAMP-2 (above) with the added feature of AUTOMATIC TEMPERATURE COMPENSATION. With the output of a PHAMP-3 automatically compensated for temperature variations, it is possible to use an inexpensive but sophisticated process meter or controller (such as the iSeries) to monitor and control pH in place of more expensive dedicated pH meters. The Automatic Temperature Compensating element required is a 1,000 Ohm RTD. (ATC is not used on ORP measurements.)

pH Preamplifiers

SPECIFICATIONS - COMMON
Output Offset: 1 mV typical; 2 mV max. which corresponds to 0.033 pH
Input Impedance: 10 to the power of 13, Ohms
Output Impedance: 20K Ohms
Output Voltage: -2000 mV to +2000 mV
Operating Temperature: 0 to 60°C (32 to 140°F)

PHAMP-1 Internal Battery Powered Model
Dimensions: 95.25 L x 17.8 mm D,(3.75" x 0.7")
Weight: 5.7 g, (2 oz.)
Battery Life: Approximately 5 Years

PHAMP-2, PHAMP-3 External Powered Dual Output
Model Power: 10 to 40 Vdc
Dimensions: 38.1 H x 76.2 W x 38.1 mm D, (1.5" x 3" x 1.5")