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Chapitre 5: Caractéristiques techniques et accessoires
36
5.6
Control Drawing Viper Ex 21204099
Hazardous (classified) location
VIPER EX SW
VIPER EX SW MB
VIPER EX M
VIPER EX MB
Viper Ex intrinsically safe input parameters
Viper Ex
pin 1 to pin 2 or 4
pin 3 to pin 2 or 4
pin 5 to pin 2 or 4
pin 6 to pin 7
pin 9 to pin 8
pin 10, pin 11
Notes for using the intrinsically safe scales Type Viper Ex:
• Install the scale Type Viper Ex in a hazardous location classified Class I, Division 1, Groups A,B,C,D (or
Zone 1 to European Standards).
• Temperature range: –10 °C to +40 °C.
The useful temperature range of the scale can be restricted in regard to its weighing specifications.
• Installation shall be in accordance with national standards for hazardous locations. In the US, follow the
National Electric Code ANSI/NFPA 70, and ANSI/NFPA RP12.6 "Installation of Intrinsically Safe Systems
for Hazardous (Classified) Locations.
• Warning: substitution of components may impair intrinsic safety.
• No revisions shall be made to this drawing without prior authorization from KEMA or Factory Mutual.
• The connection to the building ground shall be made by using the grounding screw in the backplate of
the scale.
• The Viper Ex must be connected to a power supply unit with approved intrinsically safe outputs and with
mating safety parameters (entity concept).
Control Drawing Viper Ex 21204099
Rev. 0, 14.08.2002
Class I, Div. 1, Groups A,B,C,D
U1
1
GND
2
U2
3
GND
4
U BL
5
TxD +
6
TxD –
7
RxD –
8
RxD +
9
N.C.
10
N.C.
11
grounding screw
Ui
li
8.7 V
133 mA
12.6 V
42 mA
10.5 V
74 mA
15.0 V
24 mA
15.0 V
24 mA
not connected
PSUx/230V
Installation
Drawing:
22006397
PSUx/120V
Control Drawing:
22006399
Note: Use either PSUx or PSU
Pi
Ci
1.15 W
111 nF
0.53 W
111 nF
0.78 W
1 nF
0.36 W
1 nF
0.36 W
1 nF
Unclassified location
PSU
Control
Drawing:
22006477
Li
0
0
0
0
0
ME-21204099
METTLER TOLEDO
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