Before removing the sensor, be absolutely certain
that the process pressure is reduced to 0 psig and
the process temperature is lowered to a safe level!
If the sensor is installed in a sidestream
with the sample draining to open atmos-
phere, bubbles may accumulate on the
electrodes. Trapped bubbles will cause
errors. Normally, as bubbles accumu-
late the conductivity reading drifts down.
To control bubble formation, apply a small
amount of back pressure to the sensor.
MODEL 404-16 (PVC body) MODEL 404-17 (stainless steel body)
Wetted Materials Titanium, PEEK (glass filled), PVC, Titanium, PEEK (glass filled),
EPDM, polyethylene 303 SST, EPDM
Temperature Range 32-140°F (0-60°C) 32-212°F (0-100°C)
Maximum Pressure 20 psig (239 kPa abs) at 60°C (140°F) 100 psig (791 kPa abs)
100 psig (791 kPa abs) at 25°C (77°F)
(use FNPT fittings only)
FIGURE 1. Installation of Model 404 Sensor
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The wetted sensor materials may not be compatible
with process com position and operating conditions.
Application compat ibility is entirely the
bility of the user.