Scully Signal Company
5
Insallation
Mounting into Threaded Opening
Sensors with Model MHC holder may be mounted (threaded) directly into a 2-inch NPT threaded opening
(bushing). This is the preferred mounting method as it provides the most secure installation, requiring the
least amount of periodic maintenance. When installing the sensor holder in this manner, the gasket and
conduit nut is not used. Before installation, always apply a liberal amount of Anti-Seize/Thread Lubricant
to the threads of the holder. This will assure a vapor tight joint which will be able to be easily
disassembled, if required, in the future. Scully recommends FEL-PRO® C5A® Copper Based Anti-
Seize/Thread Lubricant or equivalent.
Mounting into Through-Hole Entry
Although Scully does not recommend this mounting method, if this method is used, the Model MHC
sensor holder may be mounted directly through a 2 3/8-inch diameter opening (hole) using the nut and
gasket supplied. The gasket is positioned on the sensor holder threads outside the opening, and the
conduit nut secures the sensor holder to the tank from inside the opening. This mounting method
requires the conduit nut be tightened securely against the inside of the tank opening to compress the
gasket sufficiently to effect a vapor tight seal. In addition, like all threaded connections subject to
vibration, this mounting method requires that the conduit nut be periodically checked for proper and
continued tightness. We recommend at least a yearly check.
Flanged Holder Mounting
Sensors with MHCF style holders (shown in Sensor Outline Drawing) have a 6-bolt pattern conforming to
the 2 1/2-inch TTMA flange patten for mounting directly onto a man lid or tank shell. Install the gasket
supplied between the holder and the tank. The sensor holder is secured to the tank using (6) six 1/4” hex
head bolts, nuts and lock-washers. If there is a mating flange welded on the tank, use appropriate bolts to
thread into the mating flange. Tighten the bolts securely to compress the gasket sufficiently and effect a
vapor tight seal.
Caution: Do not install the sensor in aggressive substances that may attack the
exposed materials on the sensor.
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