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

2. INSTALLATION
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.
2.1 Tools required
Figure 3: tools required for installation
2.2 Mechanical installation
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 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
2.3 Temperature sensors
The 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 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). NGC-20-C-L units on the other hand do not support the third input (RTD limiter)
2.3.1 Lead compensation of RTD connections.
NGC-20-C-E and 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.
RAYCHEM-OM-INSTALL130-NGC20CLE-ML-2204
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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