ProductSpecifications
Sarasota SG900Specific Gravity Analyzer
The Sarasota SG900 specific gravity
analyzer is designed for the high
accuracy measurement of gas specific
gravity/relative density (SG) or molecular
weight (MW). Used in wet or dry gas
applications, the Sarasota SG900 has
a key role in energy determination,
blending control, standard volume
(mass) flow calculation and fuel gas
monitoring to ensure process optimization
and environmental compliance within
the oil and gas, petrochemical,
chemical, and power industries.
Analyze • Detect • Measure • ControlTMFormerly Thermo Measurement
Gas specific gravity (SG) measurementapplications such as fuel gas monitoringand energy determination requirecontinuous, high accuracy measurements toensure maximum efficiency and minimumwastage. Fast response is critical to ensureeffective burner, furnace or flare gasmonitoring and control.
Thermo Electron Corporation’s SarasotaSG900 specific gravity analyzer is recommendedin applications where specific gravity (SG) or molecular weight (MW) can be used toinfer density elsewhere in the plant, andwhere the gas is dirty or wet and requiresfiltering prior to the measurement.
The Sarasota SG900 is available in threestandard configurations to suit theapplication—the basic system, a dry gassystem, and a wet gas system. Specificconfiguration requirements may also beaccommodated within the systems if needed.
Housed in a weatherproof enclosure, the basic Sarasota SG900 system comprisesa Sarasota FD792 gas density assembly,temperature element, and flow controlvalve. All components are interconnected by 6 mm (0.24 in) stainless steel tubing. Thebasic system is ideal for applications wherethe analyzer is used in conjunction with anexisting gas conditioning system thatprovides a clean, dry sample at a pressurebelow 4 bar A (58 psi A).
Applications• Gas blending control• Standard volume flow control• Refinery fuel gas monitoring (CV estimate)• Oven/furnace gas monitoring (CV estimate)• Flare control systems (MW monitoring)
Features• Accurate to 0.2% reading above
0.5 SG at reference conditions• User selectable reference conditions• Integral sample conditioning• Options to suit dry or wet gas applications• Hazardous area use• Rugged construction for harsh environments• No on-site calibration required
SarasotaSG
900Specific
Gravity
Analyzer
In applications where the gas is alwaysabove its dew point, but the sample is notfiltered and the pressure not controlled, aspecific ‘dry gas’ configuration is available.This is similar to the basic system, but withan inlet pressure regulator, particulate filter,safety vent, calibration point, sampleflowmeter, flow control needle valve, and isolation valves.
Gas streams with a possibility of significantmoisture content require the ‘wet gas’ systemwhich is based on the dry gas system but with the addition of a coalescing filterand auto drain.
To maintain the measurement systemabove the gas dew point and to giveadditional repeatability, an optional steamor electric heater may be mounted withinthe enclosure.
Signal outputs from the transducers maybe fed to a Sarasota CM200 control roommounted density converter. Alternatively,the Sarasota HME900 field mounted densityconverter option provides a direct HART®
compatible output. Designed for use within harsh environments,
the Sarasota SG900 requires minimalmaintenance. Whilst regular checks on component parts are recommended, the frequency of maintenance depends upon the operating conditions.
600 mm(23.6 in)
300 mm(11.8 in)
30 mm(1.18 in)
100 mm(3.94 in)
620 mm(24.4 in)
Filter Assembly*
Autodrain Assembly*
Flowmeter Assembly*
Pressure Regulator*
Isolating Valve*
Isolating Valve
PRT Assembly
EExd Heater Terminal Box*
EExd Heater*
Density Meter PRT (RTD) &Pressure Terminal Box
Flow Out
Drain*
Calibration Gas Inlet*
Safety Vent*
Bulkhead Pipe Fitting
Flow In
Density Meter Assembly
*Optional Components
Ø8.5 mm (Ø0.33 in)
GRP Enclosure
Conduit
Isloating Valve*
High Pressure Isolating Valve*
Pressure Relief Valve
Pressure Transmitter
Flow Control Valve
800 mm(31.5 in)
727 mm(28.6 in)
Sarasota SG900 Specific Gravity Analyzer — Dimensional Diagram
SpecificationD
rawings
Ordering
Information
MODEL NUMBERSG900: Sarasota Specific Gravity Analyzer
SYSTEMTYPE
MO
DEL
NU
MB
ER
INTERN
AL
HEATER
SIGN
AL
OU
TPUT
SG900 A B C
SPOO
LM
ATERIAL
D
CERTIFICATION
OPTIO
NS
E F
A. SIGNAL OUTPUTF: Frequency outputH: Smart headmounted electronics
B. SYSTEM TYPEB: Basic systemD: Dry gasW: Wet gas
C. INTERNAL HEATERO: No internal heaterE: Electrical heaterS: Steam heater
D. SPOOL MATERIALZ: Ni-Span CY: FV520B
E. CERTIFICATIONS: Non-hazardous / safe area applicationI: Intrinsically safe / flameproof (if heater fitted)
F. OPTIONSL: Local display (headmounted version only)M: Wetted parts traceability certification to BS EN 10204.3.12.bN: BS EN ISO 15156 / NACE MR0175 conformance certificationT: Traceable calibration equipment listingW: WinHME900 communication software and modem (headmounted versions only)
NOTE: Consult your Thermo representative for details of maintenance contracts and additional services including installation, commissioning, re-calibration, service and repair
FLOW200
100
40
R
%
425
300
OUTPUT %
No.
ONLY
600 mm(23.6 in)
300 mm(11.8 in)
30 mm(1.18 in)
100 mm(3.94 in)
620 mm(24.4 in)
Filter Assembly
Flowmeter Assembly
Pressure Regulator
Ball Valve Assembly
Flow Out
Calibration Gas Inlet
Safety Vent
Flow In
Density Meter Assembly
Pressure Transmitter
Ø8.5 mm (Ø0.33 in)
GRP Enclosure Wall Fixing Lugs
High Pressure Isolating Valve
Pressure Release Valve
Ball Valve Assembly
Flow Control Valve
800 mm(31.5 in)
727 mm(28.6 in)
Sarasota SG900 Specific Gravity Analyzer with Sarasota HME900 Density Converter — Dimensional Diagram
