931 Single Gas H2S Analyzer

The 931 uses a sophisticated UV-VIS photometer to measure any single UV-absorbing gas species for process monitoring and control. Additional IR and thermal conductivity sensors capable of detecting non-UV absorbing species, such as CO2 and H2 can be incorporated into the design. The 931 is provided as an explosion-proof package making it suitable for most chemical and petrochemical applications.

Features

  • Class I, Division 1, or ATEX II 2 G Hazardous Area Rating
  • Direct measurement
  • Provision to return sample to process (with heated acid gas probe option)
  • Minimal sample conditioning
  • Dual-beam, dual-wavelength design
  • Optional detectors available (thermal conductivity-hydrogen and IR-hydrocarbon

Industrial

  • Oil & Gas
  • Chemical & Petrochemical
  • Power Plant

Description

Specifications

Methodology Dual wavelength, high resolution, nondispersive UV/VIS
Full Scale Ranges ppm and % vol are standard, other ranges are available
Standard Range
H2S 0 to 4,000 ppm min. to 0 to 100% max.
Other components and ranges are available upon request. Other components may include NH3, COS, CS2 and SO2
Accuracy Standard range (UV): ±1% of full scale
Optional (TCD) H2 sensor for TGTU applications: ±2% of full scale
Optional (IR) sensor for THC, CO2: application specific, consult factory
Repeatability Better than ±0.5% of full scale
Linearity Better than ±1% of full scale for H2S
Zero Drift Better than ±2% of full scale, with auto zero disabled over 24-hour period
Speed of Response Typically less than 30s to T90 (excluding sample system)
Number of Gases one
Zero Gas Nitrogen or instrument air
Maximum Sample Cell Pressure: 6.9 barg (100 psig)
Maximum Sample Gas Temperature: 165 ºC (329 ºF)
Typical Sample Flow 2.5 L/min (5 SCFH)
Sample Transport Application dependant (options include Heated Acid Gas probe)
Outputs Up to 4 isolated 4-to-20 mA, loop or selfpowered, 30 VDC Max; 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
Utility Requirements 120 VAC (104 to 132 VAC), 47 to 63 Hz, <3A
240 VAC (207 to 264 VAC), 47 to 63 Hz, <2A
Power Consumption 500 W max. (with heated probe and cell)
Ambient Temperature 0 to 50˚C (32 to 122˚F)
Physical Dimensions 1185 x 780 x 254 mm (46.65 x 30.7 x 9.97 in.)
Weight Approximately 145 kg (320 lbs)

Title

Go to Top