4.2
MA-120-B Submersed Fixed Installation
The ST-773 may be installed in a submersed/fixed application using the MA-120-B Submersion Adapter
Mounting Bracket and probe adapter coupler in 1-inch FNPT. (
Please note the ST773 outer diameter is 3/4 -
inch NPT. A 3/4 to 1-inch NPT bushing is required for installation
) The ST-773 dissolved oxygen sensor needs
to be installed as shown in Figure 3. For installation, users only need to purchase the MA-120-B from Pyxis
Lab and may obtain water-tight conduit and cable seal adapter from their supplier of choice. For sensor
replacement and maintenance, users only need to pull the MA-120-B and DO sensor from fixing bracket
vertically (upwards).
Figure 3.
ST-773 in a submersed fixed installation
ST-773 User Manual
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