Hydrosteel 7000 Fixed Corrosion Monitor

General Details

Hydrosteel 7000 is a fixed, totally non-intrusive corrosion monitoring device for the continuous measurement of hydrogen flux. The proven technology is ideal for use at highly critical sites within petrochemical and gas production, and petrochemical refining operations.

Hydrogen flux measurement relates directly to active sour and HF corrosion at <100 °C, and any acid corrosion (e.g. sulfide/napthenic acid) at higher temperatures.

The Hydrosteel 7000 corrosion monitor is designed for fixed monitoring on steel surfaces subject to corrosion scenarios including; sour gas wells, lines, storage facilities and treatment plants, amine and alkylation units, distillation columns, outlets and heat exchangers (NAC), and cracking unit overheads.

  • Fixed instrument for continuous hydrogen flux measurement
  • Exceptional performance without human interference
  • Can be applied to steel surface up to 500 °C
  • Intrinsically safe (approvals pending)
  • Waterproof to IP66 (pending) to protect from heavy and driven rainfall
  • Withstands harsh environments operating in ambient temperatures between -20 and 55 °C (-4 to 131 °F), in dust storms, and in environments containing volatile organics, hydrogen and humidity
  • Logs flux and steel temperature data every ten minutes

Continuous hydrogen collection and analysis

Hydrosteel 7000 analyser: includes all sensing, pneumatic, electrical and diagnostic circuits. Solid impact resistant GRP IP66 rated enclosure with support holes for racking, gland connectors for power input, thermocouple input, 2 x 4-20 mA output. Flux and ambient gas and thermocouple inputs.
Non-intrusive probes: Hydrosteel AT-F for use on steel from -40 oC to 500 oC, includes magnetic and banding attachment means for attachment to steel >4” diameter.
Conduit: Incorporates ambient and flux sample and K-type thermocouple, up to 20 ft or 6 m.
Software: Enabling downloading of internally stored data via RS-232 in a safe area or with a permit in hazardous areas.

Ingress protection rating IP66
II 2G Ex ia IIC T4 Baseefa 04ATEX0205
-40 oC < = T ambient < = +60 oC
US Equivalent
NEC 505 Class 1, Zone 1, Gas Group B, T4
NEC 500 Class 1, Division 1, Gas Group B, T4

Logged and output data: ± 10% logged reading ± resolution

< 3 minutes

1 pl/cm2/s (AT-S probe)
(note 1 pl = 10-12 Litres at s.t.p)

AT-F probe: 0 to 2000 pl/cm2/s

Via analog outputs or internally

At factory. Checked with CalCheck Hydrogen

24 V (accepts 15 – 26 V) d.c.

Analyser: -20 oC to 55 oC (-4 oF to 131 oF)
Probe: steel surface up to 500 oC

Analyser (excluding ports): 4” x 7” x 10”, or 10 x 16 x 26 cm
AT-F probe: 6” or 15 cm diameter

Analyser: less than 5.75 lb or 2.6 kg
Conduit and collector: less than 5.75 lb or 2.6 kg


The need for a fixed hydrogen flux monitor emerged from findings that corrosion is often highly episodic. Continuous monitoring is required at most high criticality sites, especially at times of high flux incidents which often occur during process upsets when inspection staff are not available.

Typical applications:

  • Corrosion control
  • Feedstock blending
  • HIC damage reduction and control
  • Sour, HF acid and high temperature corrosion monitoring
  • Risk based inspection of prospective hydrogen damage

Typical locations for monitoring include:

  • Sour gas lines
  • Amin treatment plants
  • HF alkylation units
  • Delsufurisation units
  • Distillation outlets and heat exchangers
  • Distillation and cracking unit overheads