H2S Analyzer

Theory of Operation

The PX2+ Photometric Transmitter utilizes Beers Law (the absorbance of light as it passes through a substance) at a specified wavelength to monitor changes in the concentration of an analyte in process. It sends optical radiation from a source within the instrument out to a flow cell and returns the signal to the instrument via fiber optic cable. The path length of the flow cell can be factory set at 0.1 cm. up to 3 meters to monitor concentration ranges as high as 0-100% or as low as 0-10ppm. The signal is linearized, and the resulting analog or digital signal can be sent to a PLC or DCS for process control.

PX2+ Control Panel App

The PX2+ Control Panel App allows the user to adjust the unit’s measurement, output, and logging settings. The Auto-Tune feature automatically optimizes the PX2+’s measurement setting for a particular application, while Auto-Cal determines calibration points using user-provided standards. The PX2+ Control Panel App also allows the user to view historical data, export data to Excel as a csv, and save or restore past measurement methods.

H₂S Analyzer Advantages

  • Wide Range: monitor 0-100% or as low as 0-10ppm
  • Auto-Tune: fill the flow cell with zero gas and let Auto-Cal determine the optimal settings.
  • Pressure/Temp Correction: dedicated outputs for pressure/temp allow for automatic measurement correction.
  • Robust: 3000psi max at inlet, regulated down to 500 psi max within the flow cell.
  • 1 Consumable: Xe light source typically lasts ~5 years.
  • Solid State: no moving parts; gas is brought directly from process and analyzed in flow cell.
  • Fiber Optic Sample Interface: only the sealed optics contact the sample; since the electronics are connected to the sample interface via fiber optic cable, the electronics can be installed away from the process.
  • Area Specific: various enclosure options include NEMA 4X, C1D1, and C1D2 (ask about others)

3052 Series H₂S Flow Cell Specification

ITEM DESCRIPTION
1 7 MICRON PARTICULATE FILTER
2 0-100 PSI PRESSURE REGULATOR
3 0-300 CC/MIN FLOW METER
4 FLOW CELL
5 0.89 - 448 ppm
6 0-100 PSI BACK PRESSURE REGULATO
  • Fiber Optic Connections: SMA-905 to PX2+ Inlet Pressure: 3000psi max. Outlet Pressure: Atmospheric pressure Panel Mount: Standard Path Length: 0.1cm to 3 meters Pressure/Temp Signals: 4-20mA to PX2+ Wetted Materials: 316 SS, Kalrez, and Sapphire standard
  • Inlet Pressure: 3000psi max.
  • Outlet Pressure: Atmospheric pressure
  • Panel Mount: Standard
  • Path Length: 0.1cm to 3 meters
  • Pressure/Temp Signals: 4-20mA to PX2+
  • Wetted Materials: 316 SS, Kalrez, and Sapphire standard

PX2+ Photometric Transmitter Specifications

  • Wavelength Range: 185-2600nm
  • Precision/Accuracy: 1% of full scale or better
  • Light Source: LED, Flash Lamp
  • Detector: PMT, Si Photodiode, InGaAs Photodiode
  • Display: 3.2″ Capacitive Touch Screen Display
  • Alarms: Contact Closure (60 VDC, 0.75 A max.)
  • Analog Output: 4-20 mA, isolated
  • Analog Loop Resistance: 500 ohms @ 24 VDC
  • Digital Output: USB-B, RS-485 (Modbus)
  • Power Consumption: 8.5 watts (max.)
  • Power Requirements: 24 VDC nominal (12-48 VDC)
  • Enclosure Material: Aluminium
  • Size: 5” H x 5.8” W x 2.8” D
  • Temperature: 5-55 C
  • Weight: 3.5 lbs. (1.6kg)