Lead Compensation Of Rtd Connections; Installation Of Temperature Sensors - nVent RAYCHEM Elexant 5010i Bedienungsanleitung

Enclosure interface sealing method
Thickness range for the enclosure wall (t)
Perpendicularity
Permitted use and location of any earth tags
For chamfered holes
Lock nuts
Recommended torque values
1.1.2 Grounding and bonding (earthing)
Elexant 5010i/Elexant 5010i-LIM units must be earthed in accordance with the local wiring regulations. The Elexant 5010i/Elexant 5010i-LIM
earthing system is providing internal and external earth connection facilities. All internal and external parts of the Elexant 5010i/
Elexant 5010i-LIM earthing system are interconnected inside the encapsulant. When using the external earth stud the following
requirements apply for connection.
Outside Enclosure Wall
1
3
5
Figure 6
1.1.3 Temperature sensors
The Elexant 5010i/Elexant 5010i-LIM temperature inputs are designed as intrinsically safe circuits (IEC 60079-11/EN60079-11 Ex [ib])
therefore any type of three wire DIN IEC 751 Class B PT100 resistance temperature devices can be used. The Elexant 5010i-LIM supports
3 local temperature inputs, where 2 are allocated to the temperature controller (RTD 1 and RTD 2). The third temperature input is
reserved for the temperature limiter (RTD limiter). Elexant 5010i units on the other hand do not support the third input (RTD limiter).
1.1.3.1 Lead compensation of RTD connections
Elexant 5010i and Elexant 5010i-LIM units can provide up to 20 Ohm lead resistance compensation. This implies that sensor
connections may be extended using a three-core shielded or braided cable with a maximum length of up to 150 meters
(max. 3 x 1.5 mm²). The screen or braid of the extension cable is to be grounded at the controllers end only.
1.1.3.2 Installation of temperature sensors
The temperature sensors must be installed in such a way that the sensor(s) measure(s) the surface temperature as reliably as possible.
Therefore, the guidelines as described in section 2.3.2.1 need to be followed.
1.1.3.2.1 Temperature sensor of the temperature controller
Important guidelines on sensor positioning and installation:
• The correct position is on top of the pipe. (Figure 7)
• The sensor needs to be attached with sufficient glass tape (GT-66 or GS-54).
• Use two bands of glass tape to ensure its position. (Figure 7)
• The lead wire needs to leave the insulation so that no moisture can enter the cladding-insulation system. (Figure 8)
• Fix the sensor lead wire to prevent accidental strain on the sensor tip, which could alter its position.
If the sealing surfaces are uneven, use PTFE washer NFWM25 or the green fiber
washer GFWM25 (Washers are to be ordered separately).
≥ 4 mm
+/–1° or 0.2 mm at the outer edge of the gland, whichever is smaller.
For metal glands use an internal lock not to assure earth continuity via the
Elexant 5010i/Elexant 5010i-LIM internal earth plate. Alternatively, earth tags
connected to one of the internal PE terminals can be used.
Only parallel threads are allowed.
Only use nVent RAYCHEM locknuts or types recommended by the gland
manufacturer.
The installation instructions provided by the gland manufacturers must be followed.
τ
= 4,5 Nm
4
2
3
4
1. M6 threaded earth stud (Greased, 1 pc)
2. Serrated washer (1 pc)
3. Washer (3 pc)
4. M6 threaded nut (Tightening Torque 4,5 Nm) (2 pc)
5. Seal Nyltite-Siegel (1 pc)
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