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Installation and Configuration Manual 45
SpecificationMaintenance and Fault Finding
Chapter 6
Specifications
6.1 3098 specific gravity meter specifications
Note: Some parts of this specification (marked with *) cannot be guaranteed for 3098 specific gravity
meters supplied without an IP-rated enclosure (see Safety guidelines on page 1).
6.1.1 Performance
Table 6-1 Performance specifications
Specification Description
Specific gravity limits 0.1–3 (typical)
Fluid Dry, clean, non-corrisive
Accuracy
(1)
(1) These figures apply to the measurement of a typical natural gas at a reference pressure of about 6 bars. Two gases
of known specific gravity are required for calibration (typically nitrogen and methane). In practice, the accuracy
achieved will depend on the care taken in calibration. An accuracy of 0.1% of ready can readily be obtained.
Up to ±0.1% reading*
Repeatability
(1)
±0.02% reading*
Temperature coefficient ±0.005% / °F (±0.01% / °C)*
Temperature range –22°F to +122°F (–30°C to +50°C), or as limited by gas dew
point
Control pressure at 20°C 1.2 to 7 bar absolute (17 to 101 psia)
Supply Pressure Maximum: control pressure + 15%
Maximum: control pressure + 100%, up to a maximum of 12 bar
absolute
Gas flow rate 0.012 to 3.66 in
3
/s (0.2–60 normal cc/s)
Response time Less than 5 s upon entry into enclosure with flow at 3.66 in
3
/s
(60 normal cc/s)
Output signal Nominal 6 V peak-to-peak for 3-wire system
2 to 3 V peak-to-peak across 330-Ω resistor for 2-wire system
Operating frequency range (1960 ±10%) Hz at 0 kg/m
-3
(1580 ±10%) Hz at 60 kg/m
-3
Built-in filter 7 µm
Calibration By gas sample of known specific gravity