AMETEK-930 H2S in Sulfur Pit Analyzer

Overview

Using proven ultraviolet (UV) technology, the AMETEK 930 H2S analyzer identifies potential safety risks in sulfur storage locations through simultaneous hydrogen sulfide (H2S) and sulfur dioxide (SO2) measurements.

Capable of stable, sensitive measurements ranging from parts-per-million (ppm) to percentage levels, the analyzer offers output alarms for the lower explosive limit of H2S and the smoldering fire level of SO2.

Engineering & Design

The 930 samples the vapor space gas using reliable UV technology, and the sampling system has a sulfur knock-out at the probe to eliminate entry of excess sulfur vapor or liquid into the system. The ASR900 advanced sulfur reduction sampling probe option uses a temperature-controlled sulfur condenser, providing sulfur vapor control at the sample point so that no plugging occurs in the sample lines and analyzer.

The dual-beam configuration, combined with the reference measurement, ensures low noise performance with minimal baseline and span drift. Sharing a common design with the 900 (air demand) and 910/920 (stack gas) analyzers, the 930 provides simultaneous safety measurements for sulfur recovery and de-gassing in the hydrocarbon processing industry.

Key Features

• Simultaneous H2S and SO2 measurement
• Proven UV technology
• Ppm to percentage level ranges
• Alarms for H2S LEL and SO2 smoldering level
• Sulfur knock-out at the probe
• ASR900 advanced sulfur reduction probe option
• Dual-beam configuration, minimal drift
• Common design with 900/910/920 analyzers
• For sulfur recovery and de-gassing

Applications

• Sulfur pit vapor space monitoring
• Sulfur recovery unit safety
• De-gassing process monitoring
• Hydrocarbon processing plants
• H2S and SO2 safety alarms

Specifications

For sulfur pit safety, the AMETEK 930 H2S analyzer is the established instrument, and Seven Star LLC supplies the AMETEK 930 H2S analyzer with probe options for your installation.

The AMETEK 930 H2S analyzer measures the hydrogen sulfide concentration in the sulfur recovery unit with the solid state sensing element. The analyzer draws the sample from the sulfur pit and the acid gas line and the sensor produces the signal proportional to the H2S content of the gas. The control unit displays the reading in ppm and provides the alarm outputs for the plant operation. The analyzer is certified for the hazardous area of the SRU.

The sample system of the analyzer includes the filters and the flow control to keep the sensor clean. The calibration is performed with the certified span gas and the zero gas, and the reading is verified on the monthly schedule. The spare parts of the 930 analyzer are available with the sensor and the electronic board of the unit.

The 930 analyzer is used in the sulfur recovery unit for the acid gas and the tail gas monitoring, and the sample conditioning removes the entrained liquid from the line. The control unit provides the local display and the 4-20 mA outputs for the SRU control system. The maintenance covers the sensor replacement and the filter cleaning on the routine schedule. The spare sensor and the electronic board are available for the unit.

Why Seven Star LLC

Seven Star LLC supplies the AMETEK 930 H2S analyzer for sulfur pit safety projects across the Gulf, with verified specifications and technical support. Our team assists with probe selection, installation planning, and integration with plant safety systems.

We serve hydrocarbon processing and sulfur recovery customers with reliable B2B supply of analyzers throughout the GCC.

Installation & Operation

The analyzer is installed with the sample probe in the vapor space of the sulfur pit, and the sulfur knock-out at the probe prevents excess sulfur from entering the sample system. The ASR900 probe option adds the temperature-controlled sulfur condenser for plugging protection.

The dual-beam optics maintain the calibration stability between checks, and the simultaneous H2S and SO2 measurements feed the plant alarm system for the LEL and smoldering fire levels.

Selecting the Right AMETEK 930 Configuration

Before ordering, confirm the measurement duty with the process and safety teams. The AMETEK 930 H2S analyzer is specified for the vapour space of sulfur pits and storage tanks, where hydrogen sulfide is released from liquid sulfur and where sulfur dioxide indicates a smouldering fire. The key selection points are:

• The required measuring ranges for H2S and SO2, from ppm to percentage levels, and the alarm set points agreed for the H2S LEL and the SO2 smouldering level.
• The probe type: the standard probe with sulfur knock-out, or the ASR900 advanced sulfur reduction probe with its temperature-controlled condenser for pits with heavy sulfur vapour.
• The hazardous area classification at the analyzer and probe location, and the available utilities (power, instrument air, steam or electrical heat tracing).
• The outputs and alarm contacts required by the plant DCS or safety system.

Installation and Commissioning

Mount the analyzer as close to the sample point as the area classification allows, so that the heated sample path stays short. Keep all sample lines and the probe at a temperature that prevents sulfur from freezing, and confirm heat tracing is working before the analyzer is put into service. During commissioning, verify sample flow, check the zero reading on clean gas, and confirm the span with a certified test gas. Then test each alarm contact end to end to the control room before handing the system over.

Maintenance and Troubleshooting

Most field problems on sulfur pit analyzers come from the sample system rather than the optics. A slow or falling reading usually points to a partially plugged probe, filter or sample line. Check the condenser and tracing temperatures first. Drift between checks can be caused by a contaminated measuring cell window or a failing lamp, and the dual-beam design makes such faults easier to spot. A routine plan normally includes:

• Periodic zero and span verification with a documented result
• Inspection and cleaning of the probe and sulfur knock-out
• Checks of the heat tracing, purge air and alarm function

Applications in Oman and the GCC

Sulfur recovery units in refineries and sour gas processing plants across Oman and the GCC store and handle large volumes of liquid sulfur, often at high ambient temperatures. Continuous vapour space monitoring with the AMETEK 930 H2S analyzer helps operators control degassing, keep H2S below flammable levels, and detect pit fires early.

Sourcing from Seven Star LLC

Seven Star LLC supplies AMETEK analyzers, probes and spare parts to process plants in the region. Share the model, probe option and any existing serial number, and our engineers will check the configuration before dispatch.

Request a Quote for AMETEK-930 H2S in Sulfur Pit Analyzer

For the AMETEK 930 H2S analyzer or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your measurement range, connection and configuration, and our specialists will respond with a detailed commercial proposal and the official AMETEK documentation.

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