The WEL-MVR-NN uses a platinum rod and is used where the oxidizer level is below 0.25 mg/l.
Sensors are compatible with W100, W600, W900 & Intuition 6 & 9 controllers
The 191988 housing is used for ORP cartridges, and so has no ATC element and the 4-20 mA signal is proportional to -500 to 1000 mV. 20ft cable
Preamp compatible with W600, W900 & Intuition 6 & 9 controllers
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