Installation; Tools Required; Mechanical Installation; Temperature Sensors - Pentair Raychem NGC-20-C-E Guide D'installation, D'utilisation Et De Maintenance

2. INSTALLATION

2.1 Tools required

2.2 Mechanical installation

2.3 Temperature sensors

2.3.1 Lead compensation of RTD connections.

INDUSTRIAL HEAT TRACING SOLUTIONS
For installation/operation, always observe the Equipment Safety Law, the rules of
generally accepted engineering practice (IEC60079-14/EN 60079-14), and the instructions
stated in this Manual. Carry out work on the thermostats in the de-energized state only.
Figure 3: tools required for installation
Raychem NGC-20-CL-E units comprise a temperature controller and a safety
temperature limiter installed in one enclosure. The controllers can be installed in any
position either on a stable structure by means of the 4 mounting holes. Alternatively the
Raychem NGC-20-C(L)-E units can be mounted directly on a pipe by means of a support
bracket type SB-125. In order to provide enough stability the support bracket needs to be
attached on to the pipe by means of 2 pipe straps.
Figure 4: Mounting positions NGC-20
The Raychem NGC-20C(L)-E 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 Raychem NGC-20-CL-E 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). Raychem NGC-20-C-L units on the other hand do not support the third input
(RTD limiter)
Raychem NGC-20-C-E and Raychem NGC-20-CL-E units are capable of providing 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 meter. (3 x 1.5 mm² minimum required) The screen or braid of the extension cable is
to be grounded at the controllers end only.
ML-RaychemNGC20CLE-IM-INSTALL130 Rev8
3 mm terminal screwdriver
7 mm screwdriver
Trimming knife
25 mm spanner (for 20 mm glands)
36 mm spanner (for 20/25 adapter)
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