Us Control Drawing 21201484A - Mettler Toledo PS7-X Installations- Und Wartungsanleitung

II

US Control Drawing 21201484A

Hazardous Area
FM Entity approved
equipment with
intrinsically safe
data I/O
Scale PS7(a)-(b)X
[1]
Data I/O
Data I/O
Pin 2 to 5 Pin 3 to 5
Voc: 11 V Vmax: 11 V
Isc: 26 mA Imax: 26 mA
µ
Ca: 1 F Ci: 0
La: 15mH Li: 0
[1] Temperature limits: 0 to 40 °C
For an individual scale, numbers
and letters may replace the letters
"a" and "b" in brackets.
Notes:
1. Installation shall be in accordance with the National Electric Code ANSI/NFPA 70 and ANSI/ISA
RP12.6 "Installation of Intrinsically Safe Systems for Hazardous (Classified) Locations".
2. Control room equipment connected to associated apparatus should not use or generate
more than 250 Vrms, or the maximum voltage specified for the barrier.
3. No revisions shall be made to this drawing without prior Factory Mutual authorization.
4. Under "Entity" requirements, the concept allows interconnection of intrinsically safe apparatus to
associated apparatus, not specifically examined in such combination as a system, when the
approved values of Voc (or Vt) and Isc (or It) for the associated apparatus are less than or equal
to Vmax and Imax for the intrinsically safe apparatus and the approved values of Ca and La for
the associated apparatus are greater than Ci and Li for the intrinsically safe apparatus plus the
cable capacitance and inductance parameters.
METTLER TOLEDO
CL I, DIV 1, GP C,D
either / or
connection
[3]
RS232
data I/O
max. length
10 m
grounding
[2]
screw
power
supply
cord
Safe Area
TXD
[3]
GND
RXD
Power Supply
Type PS-EX1
length
8 m Model No. 21201488
alternate: approved power supply with:
Voc: 14.3 V , Isc: 2.28 A , Po: 4.2 W
Ca: 2.28 µF , La/Ra: 0,25 mH/Ω
[2] Connect to earth ground of the building installation.
[3] Safety parameters of data I/O or FM Entity
approved Barrier:
Transmitter Voc: 11 V; Isc: 26 mA
Receiver Vmax: 11 V; Imax: 26 mA
Doc. No. 21201484A
21
Peripheral
Equipment
with FM Entity
approved Data I/O
or with FM Entity
approved barrier
mains
cable
120 V, 60 Hz
issue date: June 7, 2001