NGC-20 INSTALLATION MANUAL
6
1.7 Area of use
DigiTrace NGC-20-C(L)-E controllers are used for temperature control and temperature
limiting of electrical heaters in industrial and potentially explosive atmospheres. The
DigiTrace NGC-20-CL-E consists of a temperature controller and an additional safety
temperature limiter. DigiTrace NGC-20-C(L)-E units are approved for use in hazardous
area Zone 1 and Zone 2 (Gas) and Zone 21 and Zone 22 (Dust). Where needed the
temperature sensor of the unit can be placed in Zone 0 (Zone 20) However, the control
unit itself is not approved for being installed in Zone 0 (Zone 20).
1.8 safety instructions
During operation, do not leave this Instruction Manual or other objects inside the
enclosure. Use the temperature controller and limiter only for its intended purpose and
operate it only in clean, undamaged condition. In the event of incorrect assembly, the
requirements of IP66 as specified by IEC 60529:2001 are no longer met. Do not make any
modifications to the temperature controller and limiter that are not expressly mentioned
in this Instruction Manual.
Whenever work is done on the temperature controller and limiter, be sure to
observe the national safety and accident prevention regulations and the safety
instructions given in this Instruction Manual.
1.9 Conformity with standards
DigiTrace NGC-20-C(L)-E units meet the requirements of the following Hazardous
area- and functional safety standards and are developed, manufactured and tested in
accordance with state-of-the-art engineering practice.
Table 1: Standards overview.
1.10 Technical data
Application type
DigiTrace NGC-20-Cx-E units are approved for use in Hazardous area Zone 1 or Zone 2
(Gas) or Zone 21 or Zone 22 (Dust) and non hazardous areas
Hazardous area Approval
Baseefa08ATEX0184X
II 2 GD Gb Ex e mb ib IIC T* Db Ex tD A21 IP66 T95°C
IECEx BAS 08.0047X
Gb Ex e mb ib IIC T*
Db Ex tD A21 IP66 T95°C
T*: The switching capacity depends on the hazardous area temperature classification
(T-Class) and the maximum expected use temperature. Ratings as shown in table below
Functional Safety Approval
Baseefa08SR0134 SIL2
IEC 61508-1:1998 & IEC 61508-2:2000
IEC 60079-0, EN60079-0
General requirements
IEC 60079-7, EN60079-7
Increased safety
Ex e
IEC 60079-18, EN60079-18
Encapsulation
Ex m
IEC 60079-11 EN60079-11
Intrinsic safety
Ex i
IEC 61241, EN 61241 Parts 1 to 3
Electrical apparatus for use in the
presence of combustible dust
IEC 61508-1:2000 and IEC 61508-2:2000
For NGC-20-CL-E only: Functional Safety
of Electrical /Electronic / Programmable
Electronic Safety-related Systems
Temperature Class T5
Temperature Class T4
maximum Ambient
Temperature
maximum switching
Current
maximum Ambient
Temperature
maximum switching
Current
+ 50 °C
25 A
up to 56 °C
25 A
+ 54 °C
20 A
+ 56 °C
16 A
All values as per hazardous area certification.
Current ratings are given for a supply voltage of 254V +/-10%, 50/60 Hz and
resistive loads only.
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