A Boss For Pressure Relief Device - Its Use; Separately Mounted Transmitter Installation - Oval ALTI mass CA00A Instructions Manual

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6.8 A Boss for Pressure Relief device － Its Use
ALTImass Type U for high pressure service is
provided with a boss (Rc 1/4) to house a pressure
relief device. Intended to release internal pressure
on a rare occasion of tube rupture caused by a
process pressure buildup exceeding the tube
permissible pressure (Fig. 6.26).
Since the permissible pressure the sensor housing
can withstand is lower than that of the tube, should
an emergency occur with tube rupture, the housing
of sensor unit might eventually be damaged
depending on the process conditions.
Prior to shipment from the factory, a hex socket
head plug (R 1/4) is screwed in the female taper
pipe thread (Rc 1/4) of the boss. You may, for
added security to protect the housing against
damage, install a pressure switch or relief valve in
the boss.
WARNING: The housing of sensor unit is filled with an inert gas; do not attempt to
remove the hex socket head plug unless it is absolutely necessary.

6.9 Separately Mounted Transmitter Installation

(1) The maximum transmission cable length varies with the type of sensor unit: locate the transmitter
within this range.
(2) Secure the transmitter to a horizontal or vertical steel pipe 2 inches in nominal size using the U-bolt
furnished as standard accessories.
(3) Installation location should be accessible for maintenance and in good environment.
(4) The customer to furnish the stanchion (steel pipe).
CAUTION
Avoid installation in such location as
① Difficult to access for maintenance and servicing.
② Excessive temperature changes and vibration.
③ Potential immersion in water.
Installation on a vertical pipe
U-bolt
(2˝×1) ※

,
s
Boss
Fig.6.26 A boss to house a pressure
Hold-down hardware ※
※: U-bolt, hold-down hardware and bolts
are standard accessories.
Fig.6.27
relief device