• Sample return to process with HAG probe option.
• Minimal sample conditioning required.
• Low-maintenance design with minimal calibration drift.

• Amine-based tail gas treating units.
• Monitoring hydrogen concentrations from cobalt molybdate catalyst beds.
• Quench or absorber outlet monitoring.

• Sulfur recovery.

The 934 Single-Gas Analyzer is designed for measuring hydrogen (H2) in tail gas treating unit (TGTU) applications where hydrogen sulfide (H2S) measurement is not required. It features a rugged design adapted from the 931/932 UV analyzer platform, with a heated sensor and sample system to prevent hydrocarbon or water condensation, allowing for hot-wet H2 measurement without water removal or a pump.

• Methodology: Thermal conductivity detector (TCD).
• Standard range: H2: 0-5% or 0-10%.
• Accuracy: ±2% of full scale of standard range (0-10% H2).
• Linearity: Better than ±1% of full scale for H2S.
• Zero drift: Better than ±2% of full scale over 24 hours with auto-zero disabled.
• Repeatability: Better than 0.5% of full scale of standard ranges.
• Speed of response: Typically less than 30 seconds to T90.
• Outputs: Up to four isolated 4-20 mA, loop or self-powered, 30 VDC Max; Four non-isolated 1-5 VDC; Five independent sets of SPDT, Form C, potential free alarm relay contacts.
• Digital communication: RS485 Modbus port; RS232/RS485 service port.
• Utility requirements: 120 VAC or 240 VAC, 47 to 63 Hz.
• Power consumption: 500 W max.
• Ambient temperature: 0 to 50˚C (32 to 122˚F).
• Physical dimensions: 780 x 1185 x 254 mm.
• Weight: Approximately 145 kg (320 lbs).

• CEC Class I, Division 1, Groups B, C, D; Ex d IIB+H2 T3.
• NEC Class I, Division 1, Groups B, C, D; Class 1, Zone 1, AEx d IIB+H2 T3.
• ATEX: II 2G Ex db IIB+H2 T3 Gb.
• IECEx: Ex db IIB+H2 T3 Gb.
• Complies with all relevant European Directives.