AMETEK PI - Model 933 -H2S in Natural Gas

The 933 uses AMETEK’s proprietary frontal elution chromatography sampling technique, combined with the exceptionally high-resolution, multi-wavelength 900 Series UV optical bench. These combine to provide an accurate, interference-free measurement.

With optional measurements also available for carbonyl sulfide (COS) and methyl mercaptan (CH₃SH), the 933 is ideal for a range of applications in the hydrocarbon processing, natural gas, and petrochemical industries.

SELF-RECOVERY
Two self-regenerating columns are employed in the 933. While one column is conditioning the gas sample, the other is automatically regenerated.

INTERFERENCE-FREE MEASUREMENTS
The 933 utilizes unique, proprietary frontal elution chromatography to separate H₂S, COS and CH₃SH from interfering components in natural gas.

ACCURATE PERFORMANCE
Non-dispersive, dual-beam hollow cathode UV photometric detection of H₂S (optional COS and CH₃SH) provides accuracy better than ±2% of full scale on standard ranges.

The 933 is a unique high-resolution, multi-wavelength UV analyzer for H₂S, COS, and CH₃SH in natural gas – Find out more.

• Fully integrated analyzer and sample system
• Self-recovery after high-concentration H2S events
• Fast response to changing concentrations
• Optional COS and CH3SH measurements

• Methodology: Proprietary frontal elution sampling; nondispersive ultraviolet analysis for hydrogen sulfide (H2S), carbonyl sulfide (COS) and methyl mercaptan (MeSH)
• Full Scale Ranges: ppm ranges are standard; mg/Nm3 and other ranges are available
• Standard Range: ±2% of full scale
• H2S: 0 to 25 ppm up to to 1000 ppm max. (Secondary higher ranges available.)
• COS option: 0 to 100 ppm min. to 0 to 500 ppm max.
• MeSH option: 0 to 50 ppm min. to 0 to 250 ppm max.
• Higher ranges are available upon request

Low Range

• H2S: 0 to 3 ppm up to 50 ppm (Secondary higher ranges available.)
• COS option: 0 to 25 ppm up to 250 ppm
• MeSH option: 0 to 15 ppm up to 100 ppm

Accuracy

• Standard range: ±2% of full scale
• Low range: ±5% of full scale

Repeatability

• Standard range: ±2% of full scale

Zero Drift

• Standard range: less than ±2% of full scale in 24 hours
• Low range: less than ±5% of full scale in 24 hours
• Response Time, Excluding Sampling System
• H2S: less than 30 seconds to 90% response
• COS: less than 60 seconds to 90% response
• MeSH:
• less than 180 seconds to 90% response
• Higher ranges for H2S, COS or MeSH are available upon request.
• Sensitivity: 0.5% of full scale
• Cross-interference: H2S 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.
• Zero Gas:
• 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: 50°C (122°F)
• Typical Flow: 2.5 L/min. (5 SCFH)
• Outputs: 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
• Digital Communication: RS485 Modbus port; RS232/RS485 service port
• Power Consumption:
• Power:
• • 104 to 132 VAC, 47 to 63 Hz, <3A
  • 207 to 264 VAC, 47 to 63 Hz, <2A
• Ambient Temperature: 0°C to 50°C (32°F to 122°F)
• Dimensions: HxWxD 1185 x 780 x 254 mm (46.65 x 30.7 x 9.97 in.)
• Weight: Approximately 100 kg (220.5 lbs)