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Jerome® 631-X

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 in such industries 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.

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  • Ultra Sensitive:

    Detect hydrogen sulfide in 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 sulfide reading at the touch of a button.

  • Data Logging

    The available data logger module can store up to 1,000 measurements.

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

  • Specifications +


    Detection Range: 0.003 ppm to 50 ppm
    Resolution: 0.001 ppm *range dependent
    Accuracy: ±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: ppm
    Optional Integrated Data Storage: 1,000 test results; retains date and time
    Optional Autosample Mode: Intervals between 1 and 60 minutes
    Display: Backlit LCD
    Battery: 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
    Fuse: F1A 250 V, 5 mm x 20 mm
    Operating Environment: 0°C to 40°C, non-condensing, non-explosive
    Output: RS-232 Serial Port
    Analog: 4-20 mA passive current loop
    Dimensions: 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)
    Weight: Standard: 7 lbs. (3.18 kg)
    XE Model: 8 lbs. (3.5 kg)
    Warranty: 1 year, factory parts and labor
    Certifications: CE (220-240 VAC, 631-XE model only)
  • Features +


    Low-Level Detection: The Jerome® 631-X can detect H2S in 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: The 631-X is in active use by many regulatory agencies and landfill, 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 autosample 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.

  • Documents & Downloads +

  • Accessories, Parts & Consumables +


    Part Number Description
    990-0183 Ammonia Filter
    990-0225 10:1 Dilution Model
    1400 0052 Soft-Sided Field Carrying Case
    1400 2002 Probe
    2300 0001 Trimmer Tool
    2600 3039 Pack of 20 Fritware, .25 cm diameter
    6000 1055 Cable Assembly, JCI/JCS Interface
    6000 4003 Line Cord, 115 VAC
    6100 0010 Data Logger
    PS-151 Tube Nut
    Y411 0904 Hard-Sided Carrying Case Assembly
    Y631 0901 Accessory Kit
    Y631 0905 Maintenance Kit
    Y990-0257 Jerome Communication Software Kit (Windows 7/8)
    Y990-0259 Jerome Communication Software Data Logger Kit (Windows 7/8)
    Y2600 3945 Straight Intake Kit
    Z2600 0918 Jerome® Functional Test Module, 250 ppb, 115V
    Z2600 0930 Jerome® Functional Test Module, 30 ppb, 115V
    Z2600 3905 Zero Air Filter
    Z2600 3930 Scrubber Filter
    Z2600 3933 Scrubber Filter, LFS
    Z2600 3934 Scrubber Filter, LFD
    Z2600 3940 Chlorine Filter
    Z4000 0907 Battery Pack Assembly X431/X631

For Immediate assistance,
Call 1-508-946-6200 (US ET)
Monday - Friday from 8:00AM - 5:00PM