SOR Mini-Hermet Explosion Proof - Manual (Page 5)

Form 169 (02.13) ©SOR Inc. 5/12
 The permanently attached cables are to be suitably terminated and protected
from
impact.
Special Conditions for Safe Use for ATEX Certifi ed
Mini-Hermet Temperature Switches only
Calibration
Disconnect electrical power to the temperature switch.
NOTE: It is not necessary to disconnect electrical power with the Big Hermet series or models
in B3, B4, B5 and B6 housings provided that only the cover fastened with four captive screws
over Set Point adjustment is removed.
Remove the housing cover (or weathertight cap).
Units in Hazardous Locations – Prior to calibration, make sure that the work
area is declassifi ed before removing the explosion proof cover to calibrate
the unit. Failure to do so could result in severe personal injury or
substantial property damage.
For instruments with 3/4-inch hex set point adjustment:
Use 3/4-inch open-end wrench to turn hex adjusting nut clockwise (in) to increase
set point, and counterclockwise (out) to decrease set point.
Approximate set point can be obtained by sighting across top of adjusting nut to
calibration scale on the housing floor.
If precise set point calibration is required, it will be necessary to use a regulated
thermal bath and suitable continuity tester. Consult factory.
For instruments with dead band adjustment:
Use the fixed dead band procedure (above) to calibrate the desired decreasing
temperature set point. The increasing temperature set point can then be adjusted by
turning the white thumbwheel on the electrical switching element. Setting A yields the
smallest possible dead band. Setting F yields the widest possible dead band. Settings
above E may degrade repeatability.
Do not unthread the adjusting screw more than two threads below the fl ush
point of housing as calibration could be adversely affected.
For instruments with 1/8” hex Allen wrench set point adjustment under weathertight cap:
Use 1/8” hex Allen wrench to turn adjusting screw to achieve desired set point.
Turn the adjusting screw clockwise (in) to increase set point and counterclockwise
(out) to decrease set point.
A calibration scale is not installed, so external measurement of the process
temperature is necessary. Consult the factory.