Stamp Company : Stamp Certification Institute :
Signature : Remarks :
Model EXA SC202S-A
Model EXA SC202S-N
Title : Installation Drawing SC202S CSA
Number : FF1-SC202S-00 Page : 3 of 10
Revision : 2.4
Safe area
Vmax = 31.5 VoltDC
Imax = 100 mA
Pmax = 1.2 Watt
CSA certified
Power Supply
(HART compatible)
Output
Supply
SENSOR
terminals 11-16
+
_
G
SENSOR
terminals 11 -16
Hazardous area
Safe area
+
_
G
Protective
earth
Protective
earth
Intrinsically safe design
analyzer
EXA SC202S
+
_
Load
Resistance
Imax = 100 mA
Vmax = 31.5 VoltDC
Hazardous area
Protective
earth
+
_
24 volts DC Nominal
Supply Voltage.
Intrinsically safe design
CSA Ex ia Class1, Div.1, Group ABCD, T4 for ambient temp. < 55¡C
T6 for ambient temp. < 40¡C
EXA SC202S analyzer
CSA certified
safety barrier or power supply
with Rint=300
Ω
Suitable values are:
(HART compatible)
CSA Ex ia Class1, Div.1, Group ABCD, T4 for ambient temp. < 55¡C
T6 for ambient temp. < 40¡C
For electrical data:
see text below.
For electrical data:
see text below.
Suitable values are:
• Sensor is a thermocouples, RTD s, passive resistive switch devices, or is CSA entity approved and meet connection
requirements.
• Electrical data of the EXA SC202S :
- Supply and output circuit (terminals + and -)
Maximum input voltage V
max
= 31.5 V.
Maximum input current I
max
= 100 mA.
Maximum input power P
max
= 1.2 W.
Effective internal capacitance C
i
= 22 nF.
Effective internal inductance L
i
= 22 µH.
- Sensor input circuit (terminals 11 through 16):
Maximum output voltage V
oc
= 14.4 V.
Maximum output current I
sc
= 12.8 mA.
Maximum allowed external capacitance C
a
= 103 nF.
Maximum allowed external inductance L
a
= 200 mH.
• Barriers and power supply should be CSA certified. The specifications must not exceed the maximum values as shown in the
diagram above. Installation should be in accordance with Canadian Electrical Code, Part I or CEC, Part I.
Maximum safe area voltage should not exceed 250 V
RMS
.
For Class I, Div. 2, Group ABCD the CSA certified barrier is not required, and the Sensor input circuit (terminals 11
through 16) is non-incendive having the parameters :
Maximum output voltage V
oc
= 14.4 V.
Maximum output current I
sc
= 12.8 mA.
Maximum allowed external capacitance C
a
= 1.4 µF.
Maximum allowed external inductance L
a
= 900 mH.
• The Hand Held Communicator must be of a CSA certified intrinsically safe type in case it is used on the
intrinsically safe circuit in the hazardous area, or of a CSA certified non-incendive type in case it is
used on the
non-incendive circuit in the hazardous area.
YOKOGAWA EUROPE B.V.
Date : 26/07/2004
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