Hydrogen sulfide is one of the gas quality parameters that matters most on a natural gas network. It is toxic, it corrodes pipe and equipment, and it is normally written into the gas specification of supply and transportation contracts. For a transmission company, a gas processing plant or a large consumer, the question is not only how much H2S is in the gas, but how quickly an excursion is caught and whether the number can be defended when a buyer and seller disagree.
This note looks at the Galvanic ProTech 1000 Z2, a compact lead-acetate tape analyzer for ppb-level H2S and, with an option, true total sulfur. Figures come from the ProTech 1000 Z2 datasheet (the copy hosted on our product page) and the current Tetracon product pages. Where we give general engineering advice, it is labelled as general. No prices are given; ranges, stream count and options should be confirmed at quotation.
Why H2S needs a dedicated online analyzer
- Contract and pipeline limits. Gas specifications typically cap H2S and total sulfur at low ppm levels, so the analyzer has to be sensitive well below the limit, not just at it (general).
- Speed matters. An off-spec slug from a well, a treating unit upset or a saturated scrubber has to be seen quickly enough to divert or shut in before it travels downstream (general).
- Defensible numbers. At custody-transfer and metering points the method itself is part of the argument. The ProTech 1000 Z2 measures H2S per ASTM D4084, a recognised lead-acetate method, and Galvanic describes it as delivering custody transfer-defensible measurement.
How a lead-acetate tape analyzer works
According to our product page, sample gas reacts with a lead-acetate impregnated tape. H2S forms a dark stain, and the darkening is measured optically and converted to a concentration reading. Because the reaction is specific to H2S, the datasheet describes the measurement as no-interference. With the true total sulfur option, the analyzer also measures total sulfur (that option needs a hydrogen supply, listed under utility requirements).
The ProTech 1000 Z2 adds two things to this proven principle:
- Predictive alarms. The datasheet combines low-ppb sensitivity with predictive alarm analysis for a measurement-to-alarm time under 20 seconds. The absolute measurement T90 is 3 minutes, so the fast alarm is the early warning and the full reading follows.
- A new tape drive. Up to 70 days on a single roll, improved tape-to-tape repeatability, and a front-facing tape system that simplifies tape changes and waste removal.
Galvanic ProTech 1000 Z2 at a glance
| Item | ProTech 1000 Z2 datasheet |
|---|---|
| Measurement | H2S per ASTM D4084 (lead-acetate tape); true total sulfur with TS option |
| Ranges | Low 0-100 ppb; standard 0-300 ppm; high 0-100 % with dilution |
| Sensitivity / LDL | 5 ppb |
| Accuracy / repeatability | ±2 % FS / ±2 % FS |
| Response | Measurement-to-alarm under 20 s; absolute measurement T90 3 min |
| Streams | H2S up to 4; total sulfur up to 3 |
| Tape | Up to 70 days on a single roll, front-facing tape changes |
| Communication | Web browser-based configuration (no installs); Modbus TCP/IP or RTU; 2 x RJ45, 1 x RS485 |
| I/O and display | 4 x 4-20 mA analog outputs; 4 digital inputs (wet or dry); 4 dry-contact relays; 5" 800 x 400 colour display |
| Sample | 100 sccm; sample gas 0 to 100 °C; fast-loop sample system preferred |
| Power | 24 Vdc 100 W, 100-125 Vac or 220-240 Vac 100 W; total sulfur option AC-only, 480 W max; dual redundant AC with DC back-up option |
| Enclosure and size | Type 4X / IP68; single stream 406 x 305 x 203 mm, 18 kg before add-ons and options |
| Certification | CSA/UL Class I Zone 2 AEx ec db ic op is IIB+H2 T3 Gc; IECEx Ex ec db ic op is IIB+H2 T3 Gc; Class I Division 2, Groups BCD T3 |
| Ambient | 0 to +55 °C; install indoors or under shelter |
Where it fits on a gas network
- Custody transfer and metering stations. The datasheet highlights compressor stations, metering buildings and brownfield upgrades, where a smaller footprint and lighter weight make retrofits easier.
- Gas processing plant outlets. Continuous ppb- to ppm-level H2S after amine or scavenger treating, with relay alarms to divert off-spec gas (general application of the listed outputs).
- Multi-point monitoring. Up to four H2S streams (or three total sulfur streams) on one analyzer, for example inlet and outlet of a treating unit plus a sales line (general).
- Refining, petrochemical and sulfur recovery. Listed on our product page alongside natural gas pipelines and custody transfer monitoring.
Installation notes from the datasheet
- Shelter. The analyzer must be installed indoors or under shelter, within 0 to +55 °C ambient. For outdoor skids in Pakistan's summer heat, plan an analyzer shelter with cooling (general).
- Sample system. A fast-loop sample system is preferred. The analyzer itself consumes 100 sccm of sample, and sample gas temperature can be 0 to 100 °C.
- Utilities. An eductor drive gas is required (air, nitrogen or sample gas). The total sulfur option also needs hydrogen and AC power (480 W max).
- Area classification. The certifications are Zone 2 / Division 2 (Ex ec db ic op is IIB+H2 T3 Gc). Check that this matches the area classification of the analyzer location (general).
- Integration. Four 4-20 mA outputs and four relays suit a direct hard-wired link to the station RTU or DCS, while Modbus TCP/IP or RTU carries the full data set (general).
Other sulfur measurement options from Tetracon's principals
| Duty | Product | From the datasheet / product page |
|---|---|---|
| Compact ppb-ppm H2S and total sulfur, custody transfer, Zone 2 | Galvanic ProTech 1000 Z2 | 5 ppb LDL, 0-100 ppb to 0-300 ppm (0-100 % with dilution), alarm under 20 s, 70-day tape |
| Proven tape analyzer, Div 1 areas, remote sites | Galvanic ProTech903 | 5 ppbv, 0-100 ppbv and 0-1 ppmv ranges, 5-14 week tape life, CSA Class I Div 1 & 2, solar option (H2S variant) |
| Sulfur speciation and heating value | Galvanic AccuChrome GC5 | Modular GC, variants include BTU+H2S, BTU+Odorants and Sulfur; Modbus TCP/IP or RTU |
| Sulfur recovery unit tail gas and pit gas | Galvanic Brimstone | UV analyzer, H2S, SO2, COS and CS2 simultaneously, air-demand calculation |
| ppm H2S in natural gas or biogas, low cost | AII GPR-7500 (A)IS | Electrochemical, 0-20 to 0-2000 ppmV ranges, ATEX / IECEx Ex db ia, 4-20 mA |
Typical uses in Pakistan
- Gas transmission and distribution companies at custody-transfer, metering and compressor stations.
- Exploration and production companies at gas processing plant outlets and sales gas lines.
- Refineries and petrochemical plants monitoring fuel gas and process streams.
- Fertilizer, power and other large gas consumers checking incoming feed gas quality.
These are general application areas from our product page and our experience of the sector; they are not customer references.
What to send with an enquiry
- Expected H2S range and the contract or alarm limit, and whether total sulfur is also required.
- Number of streams and the line pressure and temperature at each sample point.
- Area classification at the analyzer location and whether a shelter already exists.
- Available utilities: power (AC or 24 Vdc), instrument air or nitrogen, and hydrogen if total sulfur is needed.
- How results go to the control system: 4-20 mA, relays, Modbus TCP/IP or Modbus RTU.
FAQ
What is the Galvanic ProTech 1000 Z2?
A compact lead-acetate tape analyzer from Galvanic Applied Sciences for continuous ppb-level H2S measurement per ASTM D4084, with an option for true total sulfur.
What ranges and sensitivity does it offer?
The datasheet lists a low range of 0-100 ppb, a standard range of 0-300 ppm and a high range of 0-100 % with dilution, with 5 ppb sensitivity and ±2 % FS accuracy.
How fast does it alarm?
Measurement-to-alarm is under 20 seconds using predictive alarm analysis. The absolute measurement T90 is 3 minutes.
How long does a tape roll last?
Up to 70 days on a single roll, according to the datasheet, with front-facing tape changes.
Can one analyzer monitor several sample points?
Yes. Multi-stream versions handle up to 4 H2S streams, or up to 3 streams with the total sulfur option.
Where can it be installed?
Indoors or under shelter, at 0 to +55 °C ambient. It carries Zone 2 / Division 2 certifications (CSA/UL and IECEx) and a Type 4X / IP68 enclosure.
Next steps
Tetracon (Pvt.) Ltd. is the sole authorized agent for Galvanic Applied Sciences Inc. in Pakistan and supplies Galvanic gas quality analyzers with local technical support. Send us your H2S range, stream count, area classification and utilities, and we will propose the right ProTech configuration and sample system. Use the contact page or see our services. Start with the ProTech 1000 Z2, compare the ProTech903, AccuChrome GC5 and Brimstone, browse gas analysis and chromatography, or see all Galvanic Applied Sciences products and the full product catalogue. Related notes: H2S and total sulfur monitoring in natural gas, natural gas BTU and composition with the AccuChrome GC and sulfur recovery analyzers with the Galvanic Brimstone. Free technical guides are collected under Guides.