Yokogawa EXA PH202 2-Wire pH/ORP Analyzer - Manual (Page 21)

IM 12B07D02-01E
2-8 Specification
2-5. Control Drawing of PH202S mA HART® Specification (ATEX)
PH 202S (pH/O R P-transmitter)
Safe area
U o = 31.5 V o lt D C
Io = 100 mA
Po = 1.2 W att
E Ex ia or ib C ertified R epeater
Pow er Supply
(H A R T C ompatible)
O utput
Supply
SE N SO R (S)
term inals 11-17
+
_
G
SEN SO R (S)
term inals 11-17
H azardous area Safe area
+
_
G
Functional
earth
Functional
earth
Intrinsically safe design
C EN ELEC standard EEX ia IIC : T4 for ambient temp. < 55°C
T6 for ambient temp. < 40°C
C ertificate nr. K EM A 06A TE X 0218 X
PH202S
+
_
Load
R esistance
E 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
Hazardous area
Functional
earth
+
_
24 volts D C N ominal
Supply V oltage.
Intrinsically safe design
C EN ELEC standard E Ex ia IIC : T4 for ambient temp. < 55°C
T 6 for ambient temp.< 40°C
C ertificate nr. KE M A 06AT EX 0218 X
(HA R T compatible)
(pH /O R P-transmitter)
Zone 0 or 1
Z one 0 or 1
・ 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 safety barrier shall be certified by notify body.
・ Installation should be in accordance with local installation requirements.
・ If use ordinary wirings, the general purpose equipment must have Nonincendive
Field Wiring terminal approved.
・ The Hand Held Communicator must be of a ATEX certified intrinsically safe type in case
it is used on the intrinsically safe circuit in the hazardous area or of a ATEX certified
non-incendive type in case it is used in the non-incendive circuit in the hazardous area.