Specifications of SS 4203 Gas Flow Computer
| Functional |
| Flow Calculations |
AGA-3 1992/2000 orifice plate, V-Cone and AGA-7 turbine meter |
| Density Calculations |
AGA-8, 1992 and NX-19 |
| Event/Alarm/History Logs |
35 days hourly history, 35 days daily history, 700 events and 300 alarms (as per API 21.1) |
| Features |
| Protocols |
Modbus master/slave with store and forward
EFM (Enron) Modbus
Optional DNP 3 |
| Discrete Input/Output |
One, dry contact, usable for level or pulse inputs to 10 kHz shared with 0.5 A sinking digital output |
| Turbine Meter Input |
One turbine meter input with integral pre-amplifier to 10 kHz shared with 0.5 A sinking digital output (DS version only) |
| Analog Inputs |
Two 0 to 5 V, 15-bit resolution (DS version only) |
| Analog Outputs |
Two 0 to 20 mA, sinking, 12-bit resolution (DR version only) |
| Communication Ports |
Two configurable RS-232/485 ports, 1200 to 115200 baud |
| Processors |
One 32-bit ARM microcontroller, 32 MHz clock
One sensor interface co-processor |
| Memory |
4 Mb CMOS static RAM
8 Mb flash ROM (remotely downloadable)
1024 bytes EEPROM |
| Battery |
RAM memory and clock calendar retained for two years |
| Sensor Performance |
| Differential and Absolute Pressure |
Accuracy ±0.05% of span (for spans between 10% and 90% of URL) |
| Digital Output (spans <10% URL) |
Accuracy ±(0.005)x(URL/span)% of span* |
| Long Term Drift Stability |
<±0.05% of URL per year over five years |
| Temperature Accuracy |
Accuracy ±0.5°F (0.28°C), not including RTD uncertainties |
| Static Pressure Effect on Differential
Pressure Readings |
The zero shift and span shift for a 1000 PSI (7 MPa) static pressure change is:
ZERO Shift ±0.05% of URL, SPAN Shift ±0.1% of reading |
| Ambient Temperature Effect |
Total effect for a 50°F (28°C) change within normal operating condition limits for absolute and differential pressure is:
Digital Output: ±(0.0625% URL + 0.125% Reading) |
| Power |
| Supply Requirements |
9 to 30 Vdc, 330 mW typical at 12 Vdc |
| Certifications |
c(CSA)us Explosion Proof, Class I, Division 1, Groups B, C and D Hazardous Locations
c(CSA)us Class I, Division 2, Groups A, B, C and D Hazardous Locations
IECEx to Exd IIC T6
ATEX to EEx d IIC T6
RTD connections rated non-incendive in Division 2 areas |
*Accuracy stated includes the effects of linearity, hysteresis and repeatability.
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