Yokogawa EXA PH202 2-Wire pH/ORP Analyzer - Manual (Page 20)

IM 12B07D02-01E
Specification 2-7
2-4. Control Drawing of PH202S mA HART® Specification (IECEx).
PH202S (pH/O R P-transmitter)
Safe area
U o = 31.5 V o lt D C
Io = 100 mA
Po = 1.2 W att
EX ia or ib C ertified R epeater
Pow er Supply
(HAR T C ompatible)
O utput
Supply
SE N SO R (S)
term inals 11-17
+
_
G
SEN SO R (S)
term inals 11-17
Zo ne 0 o r 1
Hazardous area Safe area
+
_
G
Functional
earth Functional
earth
Intrinsically safe design
IEC -Ex standard EX ia IIC : T4 for ambient temp. < 55°C
T6 for ambient temp. < 40°C
C ertificate nr. IEC Ex KEM 06.0052X
PH202S
+
_
Load
R esistance
EX ia or ib
C ertified safety barrier or pow er
w ith R int= 300
:
Io = 100 mA
U o = 31.5 V o lt D C
Zo ne 0 o r 1
Hazardous area
Functional
earth
+
_
24 volts D C N ominal
Supply V oltage.
Intrinsically safe design
IEC Ex standard EX ia IIC : T4 for ambient temp. < 55°C
T6 for ambient temp.< 40°C
C ertificate nr. IEC Ex KEM 06.0052X
(HAR T compatible)
(pH/O R P-transmitter)
・
Sensor(s) are of a passive type to be regarded as ‘simple apparatus’.
・ Electrical data of the PH202S.
- Supply and output circuit (terminals + and -):
Maximum input voltage U
i
= 31.5 V. Maximum input current I
i
= 100 mA.
Maximum input power P
i
= 1.2 W.
Effective internal capacitance C
i
= 22 nF.
Effective internal inductance L
i
= 35 PH.
- Sensor input circuit (terminals 11 through 17):
Maximum output voltage U
o
= 14.4 V. Maximum output current I
o
= 32.3 mA.
Maximum allowed external capacitance Co = 600 nF. (for PH202S-E,-C,-U),
Co = 3.5 PF (for PH202S-N).
Maximum allowed external inductance Lo = 34 mH (for PH202S-E,-C,-U),
Lo = 76 mH (for PH202S-N).
・
Barriers and power supply specification must not exceed the maximum values as shown
in the diagram above. These safety descriptions cover most of the commonly used
industry standard barriers, isolators and power supplies.
・ The Hand Held Communicator must be of a IECEx certified intrinsically safe type in
case it is used on the intrinsically safe circuit in the hazardous area or of a IECEx
certified nonincendive type in case it is used in the nonincendive circuit in the
hazardous area.