Do402G Specifications; General - YOKOGAWA EXA DO402G Instruction Manual

2. DO402G SPECIFICATIONS

2-1. General

A. Input specifications
: The DO402G Dissolved
Oxygen converter measures
the current, that is generated
by the Dissolved Oxygen
sensor. The flexibility of the
input circuit allows the use of
many commercially available
sensors, whether they are of
the Galvanic type (driving
voltage generated internally) or
Polarographic type (driving
voltage supplied by converter)
The input range varies from
0.0 nA up to 500 nA for
polarographic sensors and 0.0
to 50 µA for galvanic sensors.
Temperature measurement for
automatic temperature
compensation utilizes Pt100,
PT1000 RTD elements or 2k2
NTC as used in DOX8 and
DO30 sensors, as well as the
22 k NTC as used by SM31.
B. Input ranges
- DO : 0- 50 mg/l (ppm)
- Temperature : 0- 50 ºC (30- 130 ºF)
C. Span
- DO concentration
: minimum: 1 mg/l (ppm)
maximum: 50 mg/l (ppm)
- % saturation : minimum: 10 %
maximum: 300 %
- Temperature : minimum: 25 ºC (50 ºF)
maximum: 50 ºC (100 ºF)
D. Transmission Signals
: Two isolated outputs of 0/4-
20 mA DC with common
negative. Maximum load 600
Ohm. Auxiliary output can be
chosen from Temperature,
DO, PI control, table, burn up
(22 mA) or burn down (0 or
3.5 mA) to signal failure
E. Temperature compensation
: 0- 50 ºC
Sensor types: Pt100 or
Pt1000 RTD; 2k2 NTC (PB36:
Yokogawa compatible);
22 k NTC (Ingold compatible)
Automatic or Manual
temperature compensation
F. Calibration : Semi-automatic calibration
with automatic compensation
for influence of barometric
pressure and altitude on
partial pressure of oxygen in
air (or solubility of oxygen in
water). Automatic compensa-
tion for influence of salinity of
water on solubility of oxygen in
water is programmable
The correction for pressure,
salinity and temperature meets
ISO 5814
Possible calibration routines
are:
- Slope (span) calibration in
- Slope (span) calibration in
- Zero calibration (normally
G. Serial Communication
: Bi-directional according to the
EIA-485 standard using HART
protocol and PC402 software.
H. Logbook : Software record of important
events and diagnostic data.
Available through RS485.
I. Display : Custom liquid crystal display,
with a main display of 3
digits 12.5 mm high. Message
display of 6 alphanumeric
characters, 7 mm high.
Specification 2-1
ambient air. The calibration
table is based on 70 % RH
and is determined
empirically.
water, saturated with air:
according ISO 5814
inactive)
IM 12J6B3-E-H
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