Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 19)

IM 12J05C01-01E
・ Electrical data of the DO202S.
- Supply circuit (terminals + and -):
Maximum input voltage Vmax = 31.5 V. Maximum input current Imax = 100 mA.
Maximum input power Pi = 1.2 W.
Effective internal capacitance Ci = 22 nF. Effective internal inductance Li = 35 PH.
- Sensor input circuit (terminals 11 through 18):
Maximum output voltage V
t
= 14.4 V. Maximum output current I
t
= 10 mA.
Maximum allowed external capacitance C
a
= 643 nF.
Maximum allowed external inductance L
a
= 340 mH.
・ If Hand Held Terminal (HHT) is not connected to the power supply lines of the DO202S
(see figure 1):
Any FM Approved barrier or power supply may be used that meets the following requirements.
V
oc
or V
t
d 31.5 V; I
sc
or I
t
d 100 mA; C
a
t 22nF + C
cable
; L
a
t 35PH + L
cable
If HHT is connected to the power supply lines of the DO202S (see figure 2):
The Hand Held Terminal must be FM Approved. Refer to the manufacturers control drawing of the
HHT and the barrier/power supply to determine the cable parameters.
(V
oc
or V
t
) + V
HHT
d 31.5 V; (I
sc
or I
t
) + I
HHT
d 100 mA;
C
a
t 22nF + C
cable
+ C
HHT
; L
a
t 35PH + L
cable
+ L
HHT
When installing this equipment, follow the manufacturer ’s installation drawing.
Installation should be in accordance with ANSI/ISA RP 12.06.01 “Installation of Intrinsically Safe
Systems for Hazardous (Classified) Locations” and the National Electrical Code (ANSI/NFPA 70).
Control equipment connected to the barrier/power supply must not use or generate more than 250
Vrms or Vdc.
・ Resistance between Intrinsically Safe Ground and earth ground must be less than1.0 Ohm.
・ In case of using cable glands in Outdoor location, they shall be UV rated or made of metal.
WARNING
- Substitution of components may impair Intrinsic Safety
- To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing or
read, understand and adhere to the manufacturer ’s’live maintenance procedures.
Sensor
terminals 11-18
Max. cablelength: 60 mtr.
Cable dia. : 3…12 mm.
Sensor
terminals 11-18
Max. cablelength: 60 mtr.
Cable dia.: 3…12 mm.
Ùnclassified Location
FM Approved
Power Supply
(HART compatible)
Output
Supply
+
_
G
Classified Location Unclassified Location
+
_
G
Functional
earth Functional
earth
Intrinsically safe design
FM Class I, Div.1, Group ABCD,
T4 for ambient temp. < 55°C
T6 for ambient temp. < 40°C
DO202S transmitter
+
-
Load
Resistance
Classified Location
Functional
earth
+
_
24 volts DC Nominal
Supply Voltage.
FM Approved safety barrier or
power supply
with Rint = 300
:
(HART compatible)
For electrical data:
see text below.
For electrical data:
see text below.
Intrinsically safe design
FM Class I, Div.1, Group ABCD,
T4 for ambient temp. < 55°C
T6 for ambient temp. < 40°C
DO202S transmitter
Figure 1
Figure 2
General Specifications 2-8
2-6. Control Drawing of DO202S mA HART® Specification (FM Intrinsically safe design)
Application Doc. No.: IKE030-A10 P.5 to P.6