User Manual - P series
4
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4.
Qualified equipment in accordance with RCC-E
The pressure switches and temperature switches of the P series meet the design and construction rules for electrical
equipment of nuclear plants.
Refer to the equipment identification sheet (according to the last index NTP N 100 – consult us) for a definition,
installation rules and recommendations for maintenance of the equipment in accordance with the associated quality
and general requirements.
5.
General information concerning functions
The instruments may be equipped with electrical or pneumatic functions.
5.1. Electrical functions
Note:
The dead band values given in our catalogues are indicative values recorded in a laboratory, measured
between the maximum and minimum settings. If the instrument is used outside its operating limits, the set
point(s) and dead band values may be affected.
The electrical operation of the instrument differs according to the type of microswitch used. Many different
versions are on offer (gilt, tropicalised, nitrogen sealed, etc.).
5.1.1. Single fixed dead band electrical operation:
Microswitch “only“. Each type of microswitch has its own characteristics, as indicated in the catalogue.
Models: 4, 4D, 10, 10D, 16, 16D, 8, 98, 60, 60C, ...
5.1.2. Single adjustable dead band electrical operation:
Microswitch combined with a spring (RE) to increase the microswitch dead band value in a given range
(refer to the dead band table in the catalogue)
The trigger value of the upper threshold can be offset using the RE.
This action has no effect on the lower threshold.
Models: 6, 6V, 96, 62, 62C, ...
5.1.3. Electrical operation with two simultaneous contacts:
Combination of two single functions set to act at the same time, either upwards or downwards. The dead band of a
simultaneous function is greater than that of a single function. When rolling out from the factory, the simultaneity is
wedged to the decrease of pressure / temperature.
Fixed dead band models: 44, 30, 36, 38, 108, 160, 160C, ...
Adjustable dead band models: 34, 34V, 106, 162, 162C, ...
5.1.4. Electrical operation with two offset contacts:
Combination of two single functions adjusted to act with a gap between. The spring (RE) is used to adjust the gap
between the interlocking of the switches.
Models: 46, 54, 54V, 50, 56, 116, 118, 172, 172C, 170, 170C, ...
5.1.5. Electrical operation with manual reset:
Once triggered, the switch returns to its initial position only if you press the button located on the side of the housing,
and only if the pressure or temperature has dropped (type 18 max. cut-off device) or climbed
(type 20 min. cut-off device) beyond the set point.
