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Model 933 H
S in Natural Gas
Extended, unattended operation for up to 6 months or longer
Self-recovery after high concentration H
Fast response time to increasing or decreasing H
Concentration measurements of COS and methyl mercaptan optionally available
No consumables, reagents, or disposables other than zero gas
There is worldwide need for a low maintenance, reliable H
S analyzer in order to reduce the high expenses associated with frequent scheduled and unscheduled maintenance.
AMETEK Western Research has responded to the need for a low maintenance, reliable, and rugged H
S analyzer by developing the Model 933. The Model 933 uses a proprietary sampling technique combined with our exceptionally high resolution multi-wavelength UV optical bench. The result is a unique low level H
S analyzer that is designed to operate unattended for six months or more. The analyzer responds quickly to changes in H
S concentration and it quickly self-recovers from extreme upset conditions.
Pipeline quality/custody transfer
Synthetic natural gas (SNG)
AMETEK Western Research's unique sample conditioning system uses frontal elution chromatography to separate and eliminate interfering species. This ensures an accurate analysis of the gas via direct-UV absorption spectroscopy. Two self-regenerating columns are employed in the 933. While one column is conditioning the gas sample, the other is automatically regenerated.
Optionally, the 933 can be configured to output concentration values for COS and methyl mercaptan thereby offering an extremely cost effective solution for monitoring these compounds.
Proprietary frontal elution sampling; nondispersive ultraviolet analysis for hydrogen sulfide (H
S), carbonyl sulfide (COS) and methyl mercaptan (MeSH)
Full Scale Ranges:
ppm ranges are standard; mg/Nm3 and other ranges are available
±2% of full scale
0 to 25 ppm up to to 1000 ppm max. (Secondary higher ranges available.)
0 to 100 ppm min. to 0 to 500 ppm max.
0 to 50 ppm min. to 0 to 250 ppm max.
Higher ranges are available upon request
0 to 3 ppm up to 50 ppm (Secondary higher ranges available.)
0 to 25 ppm up to 250 ppm
0 to 15 ppm up to 100 ppm
±2% of full scale
±5% of full scale
±2% of full scale
less than ±2% of full scale in 24 hours
less than ±5% of full scale in 24 hours
Response Time, Excluding Sampling System
less than 30 seconds to 90% response
less than 60 seconds to 90% response
less than 180 seconds to 90% response
Higher ranges for H
S, COS or MeSH are available upon request.
0.5% of full scale
S concentration measurement—less than 2% of the sum of COS and MeSH
Sample Stream Requirements:
greater than 80% methane, less than 10% ethane, less than 3% propane, less than 1.25% total butanes, less than 0.5% C5+. Maximum water content is 0.6%.1.
Applications that exceed the composition limits possible, but must be reviewed by the factory as different specifications may apply.
Instrument zero purity carbon dioxide; UHP nitrogen, or UHP methane. Minimum auto-zero interval is once per 24 hours.
Process Pressure Requirement:
830 kPag to 13790 kPag (120 psig to 2000 psig)
Maximum Sample Cell Pressure:
100 psig (6.9 barg)
Maximum Sample Gas Temperature:
2.5 L/min. (5 SCFH)
Up to 4 isolated 4-to-20 mA, loop or self-powered; 4 non-isolated 1 to 5 VDC; 5 independent sets of SPDT, Form C, potential free alarm relay contacts, 2 A at 240 VAC
RS485 Modbus port; RS232/RS485 service port
<500 W (excluding sample and vent line)
104 to 132 VAC, 47 to 63 Hz, <3A
207 to 264 VAC, 47 to 63 Hz, <2A
0°C to 50°C (32°F to 122°F)
HxWxD 1185 x 780 x 254 mm (46.65 x 30.7 x 9.97 in.)
Approximately 100 kg (220.5 lbs)
Product Data Sheets
Model 933RM UV H
Combining Spectroscopy and Separation Science in Process and Emissions Monitoring
When Capability is Critical
Model 933 Sample Flow
Gas Concentrations Measured
Natural Gas Process Instrumentation
CEC Class I, Division 1, ExD B, Groups C & D; Ex d IIB T3
Class I, Division 1, Groups B, C&D / Class I, Zone 1, AEx d IIB+H2, T3
CEC/NEC Class I, Division 2, Groups B, C&D, ExP T3 (unit verification)
ATEX II 2 G Ex d IIB T3 Gb
Russian Ex Proof Certification; 1ExdIIBT3 X
Russian Gosstandart Pattern Approval
Complies with all relevant European directives
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