SOR Big Hermet Explosion Proof, Hermetically Sealed, Pressure Switch - Manual (Page 4)

4/8 Form 280 (04.13) ©SOR Inc.
Special Conditions for Safe Use
 The terminal box to which the equipment is attached must, together with the switch,
ensure the requisite thread engagement for Apparatus Group IIC.
 The permanently attached cables are to be suitably terminated and protected from
impact.
 When the switch is attached to an increased safety terminal box the assembly must be
capable of withstanding the impact test specified in BS 5501: Part 1: 1977.
 The sealing arrangements must maintain the minimum IP54 rating required by the
increased safety enclosure.
 The switch must attach to the enclosure using an existing entry.
Calibration Procedure

Remove weathertight cover from housing. It is unnecessary to disconnect electrical
power because the hermetically sealed switching element capsule maintains explosion
proof integrity.

Use 3/4” open-end wrench to turn hex adjusting nut clockwise to increase set point;
counterclockwise to decrease set point. Approximate set point can be obtained by
sighting across top of adjusting nut to calibration scale on interior wall of housing. If
precise set point calibration is required, it will be necessary to use a regulated pressure
source, a suitable continuity tester, and a 1/4% or better test gauge.

Replace housing cover and gasket to ensure weathertightness.
Switching Element Capsure Assembly has been precisely positioned in the
housing and overtravel adjusted at the factory for optimum performance.
Any inadvertent movement or replacement in the fi eld will degrade
performance and could render the device inoperative, unless factory
authorized procedures are followed.