PH /ORP AMPLIFIERS

All pH circuits require a high impedance pre-amp to which the electrode connects.

This pre-amp will either be a part of the the meter or is available as a separate external component. Many process controllers require external preamplifiers, to match the impedance gain of the electronic circuit to the actual pH electrode.
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Sensorex electrodes can be connected directly to the meter, when the pre-amp is built into the circuit, and the cables are relatively short.

For longer cable runs (more than about 22 feet or about 7 meters) or where there is significant plant electrical "noise", an external preamplifier will help to provide a cleaner signal. You may even be able to obtain longer life from your pH electrodes!

When the Original Equipment Pre-amp cannot be accessed; (for example, it may be built into a disposable electrode), a Sensorex Pre-amp will be needed, regardless of the length of cable.

Low cost battery powered inline preamplifiers such as our PHAMP-1 may be adequate to match up to your controller. The economical Sensorex PHAMP-1 is a battery powered in-line design. It is designed to boost the signal and lower the impedance from a pH electrode to a pH monitor, controller or transmitter. It can be used for long cable runs of up to 1,200 feet (300 meters). Use this pre-amp when your instrument is not designed to power a remote amplifier. The PHAMP-1 can also be used to input a pH electrode signal directly into a device which can accept voltage inputs. The batteries are sealed, and have an estimated life of more than 3 years. The PHAMP-1 has an operational output of +/- 2000 mV. The BNC connector from your coax electrode cable is attached to the BNC Receptacle input connection on the PHAMP-1. The output is a BNC connector. You must have a BNR receptacle on your Cable to connect from the output and go to your controller. Sensorex provides accessory cables and adapters to make this transition. The PHAMP-1 is not water proof, you must protect it from water and the elements.

OEM line powered preamplifiers are more economical over the long term, and provide the optimum service life for the majority of installations. Refer to the Preamplifier Guide (below) to select the Pre-amp Locate the Original Equipment meter in Column A and order the Pre-amp listed in Column B. Download pre-amp wiring diagrams.

PREAMPLIFIER GUIDE
Meter-Transmitter-Controller	Preamplifier	Great Lakes, 670 300	Preamplifier
All controllers not pre-amp ready	PHAMP-1	L & N, 7073, 7075 , 7082, 7083, 7084	PHAMP-1
Beckman, SoluComp	U698-03	L & N, 7076, 7079	U698-03
Beckman, 940	V-1	Lakewood 820,830,	V-1
Beckman, 960	V-2	Rosemount/Uniloc, 1000, 1001, 1002, 1003	V-2
Foxboro, 2220	V-1	Rosemount/Uniloc, 1050, 1181	V-1
Foxboro, 870, 872, 873, 874	V-2	Rosemount, 1054, 1054A, SoluComp	V-2
Great Lakes, 60, 70	V-1	Rosemount 2081	V-1
Great Lakes, 90, 95, 570, 671, 672, 690 300	GL90-A	Signet 710, 719, 750, 9750, 9759, 9030	GL90-A

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email: info@phorp.com