Jerome 631-X Gold Film Hydrogen Sulfide Analyzer

$14,883.00 - $17,436.00

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Note: Accessory kits (sold separately) are necessary to operate this product. Accessory kits and other requirements like power cords can be purchased using the following links:
Purchase Jerome® accessory kits
Purchase power cords (only for 220V)
Purchase Operation Manual

Gold Film Hydrogen Sulfide Analyzer 

The portable Jerome® 631-X Hydrogen Sulfide Analyzer displays low-level concentrations in just seconds. It offers an analysis range of 0.003-50 ppm for odor and corrosion control, safety, and leak detection. This is important for industries such as wastewater treatment, oil and gas, pulp and paper, and farming. This simple-to-use instrument utilizes an internal rechargeable battery pack or AC power and is easily carried to suspected sources of hydrogen sulfide for detection and measurement. Locked in survey mode, the 631-X automatically displays hydrogen sulfide concentrations as quickly as every 3 seconds. 

  • Ultra-Sensitive: Detect hydrogen sulphide in the air at levels as low as 3 parts per billion (3ppb).
  • Rugged: Its sturdy metal housing makes the 631-X tough enough for nearly any environment.
  • Proven: The Jerome’s gold film sensing technology has been validated in the laboratory and in the field for more than 35 years.
  • Simple to Operate: Get an accurate hydrogen sulphide reading at the touch of a button.
  • Data Logging: The available data logger module can store up to 1,000 measurements.

Features and Benefits

  • Low-Level Detection: The Jerome® 631-X can detect H2S in the air from 0.003 ppm to 50 ppm, making it ideal for regulatory compliance and odor control monitoring, scrubber efficiency testing, monitoring corrosion in control rooms, and more.
  • Gold Film Sensor: Validated in the field and in the lab for over 35 years, our proprietary gold film sensor ensures repeatable results across a wide range of applications.
  • Rugged Construction: Housed in a sturdy metal case, the 631-X is built to withstand rough operating conditions and deliver accurate results whether it is in the field or in the lab.
  • Easy to Use: The quick reference guide beneath the handle helps simplify day to day use and the easy to read display screen is equipped with an automatic backlight that activates in low-light situations.
  • Regulatory Compliance: 631-X is in active use by many regulatory agencies and landfills, water treatment, and waste management facilities across the world.
  • Survey Mode: The 631-X features a survey mode that allows the user to continuously draw in samples of air in order to sweep an area for hydrogen sulfide hot spots and enable corrective action to be taken.
  • Optional Data Logging: When equipped with data logging capabilities, the 631-X can store data for up to 1,000 samples, including date and time.
  • Optional Autosample Mode: The 631-X offers an optional autosampler mode that can be programmed to take a sample at various intervals between 1 and 60 minutes.
  • Field Regeneration: Sensor regeneration for the 631-X can be performed in the field using the optional Power Inverter Kit, allowing for extended on-location testing.



Detection Range:

 0.003 ppm to 50 ppm


0.001 ppm *range dependent


±0.003 ppm at 0.05 ppm
±0.03 ppm at 0.5 ppm
±0.3 ppm at 5 ppm
±2 ppm at 25 ppm

Response Time:

Survey Mode: 3-20 seconds
Sample Mode: 12-30 seconds

Flow Rate:

150 ± 10 mL/min

Result Units:


Optional Integrated Data Storage: 

1,000 test results; retain date and time

Optional Autosample Mode:

Intervals between 1 and 60 minutes


Backlit LCD


Rechargeable NiCad
6-hour life, charges in 14 hours

Power Requirements:

100-120 VAC, 50/60 Hz, 1A or
220-240 VAC, 50/60 Hz, 1A


F1A 250 V, 5 mm x 20 mm

Operating Environment:

0°C to 40°C, non-condensing, non-explosive


RS-232 Serial Port
Analog: 4-20 mA passive current loop


Standard: 13″ L x 6″ W x 4″ H (33 cm L x 15 cm W x 10 cm H)
XE Model: 14″ L x 7″ W x 7″ H (35 cm L x 18 cm W x 18 cm H)


Standard: 7 lbs. (3.18 kg)
XE Model: 8 lbs. (3.5 kg)


1 year, factory parts and labor


CE (220-240 VAC, 631-XE model only)

Contact our sales team for more information on our Jerome® series. 


Jerome J631-X Brochure