Omega, PHE - 1411. A high quality, semi-rugged gel filled, double junction probe. Probe body is fiberglass, with 3 foot lead, BNC connector. Standard glass bulb, shielded by probe body. Works well with careful handling. Other probes: PHE - 4202.

 

 

Omega, ORE - 1411 (not shown) An excellent, low cost probe. Fiberglass body provides protection for probe tip.

Omega, ORE-1411- ACRYL-CJ (not shown), for use in high ORP solutions.

 

Oakton 35816-77 Double junction gel probes

 

A note on pH and ORP gel filled probes: all pH and ORP probes should be considered disposable. Gel filled probes are the longest lasting of the non-refillable type and typically have a useful lifetime of approximately 1 to 3 years. Ground currents and other sources of electrical "noise" tend to deplete the internal electrolyte at a much faster rate. Use of an electrically isolated line amplified, like the COS optically isolated amplifiers, usually extends this performance period. The line amplifier also eliminates noise, and lets you place the probe up to 1000 feet away from the MCU or PLC. Where the pH is considerably higher or lower than 7, the lifetime will also be shorter. Please refer to the application note AN1002 "On the care and feeding of pH probes" for additional information.