Aquametrix P/R60 Differential pH/ORP Sensors User Manual - Manual (Page 4)

P/R60 & P/R65 Page 4
1. GENERAL INFORMATION
This manual covers all AquaMetrix P60, P65, R60 and R65 Series differential measurement pH and
ORP probes.
All mounting configurations are described.
Both those probes with encapsulated preamplifiers and those with encapsulated two-wire
transmitters are covered. If your probe has five wires it has an encapsulated preamplifier (P60 and
R60). If your probe has two wires, or in the case of an ORP probe four wires, it has an
encapsulated two-wire transmitter (P65 and R65).
The output from a two-wire transmitter type is non-isolated and un-calibrated. The system must
provide 24 Vdc, with “low” isolated from earth ground, and a means of calibrating for offset and
span.
NOTE: Do not discard the protective cap(s) that came with the sensor. If the sensor is removed
from the process for an extended period of time, thoroughly clean the sensor, put a piece of cotton
ball with few drops of water into the protective cap and replace it on the sensor. This keeps the
junction from drying out which causes slow response when put back into operation or causes
permanent damage to the sensor. Sensors should not be left in dry lines or empty tanks for
extended periods.
Do not store the sensors in a dry or humid location. When storing, check the protective cap(s)
regularly to make sure the cotton ball remains moist. Improper storage of sensors voids the
warranty.