Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
P4, P8, H4, H8 Switch Mechanisms - Simple Apparatus
When used as “Simple apparatus” within a hazardous atmosphere the following should be noted:
1.The product should be installed by suitably trained personnel, in accordance with all applicable local and national codes.
2.As the product has no source of internal heating, the temperature classification is dependent on the ambient air
temperature and the temperature of the process vessel to which it is attached.
3.Materials of construction: Refer to product catalogue or customer drawing for actual material of level switch concerned.
Housing and Cover:
Carbon Steel, or Stainless Steel 316 type, or Aluminum Alloy LM25 or LM24
or B85 grade 360, or Cast Iron grade 250
Pressure Tube & Union:
Stainless Steel types 316, 321 or 304, or Carbon Steel 220M07 or ASTM A108, or
Alloy NA18, or Alloy C-276 (UNS N10276) or Alloy 625 (UNS N06625), or Alloy 825
(UNS N08825)
If the equipment is likely to come into contact with aggressive substances, it is the responsibility of the user to take suitable
precautions that prevent it from being adversely affected, thus ensuring that the type of protection is not compromised.
Aggressive substances: e.g. acidic liquids or gases that may attack metals or solvents that may affect polymeric materials.
Suitable precautions: e.g. regular checks as part of routine inspections or establishing from the material’s data sheet that it
is resistant to specific chemicals.
4.It is the responsibility of the user to ensure:
a. The joint requirements between the switch housing and vessel are compatible with the process media.
b. The joint tightness is correct for the joint material used.
c. That suitable temperature rated cable is used.
Note
: The cable entry temperature may exceed 70°C
d. The float is protected from impact or friction, or static electrical build-up from fast flowing non-
conductive fluids, that could generate an ignition source.
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