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    Larson Electronics Hydrogen Gas Detector - Explosion Proof

    • $1,323.68
    Contact Us for Lead Time.

    The EXP-GS-GPM-B from Larson Electronics is an Explosion Proof Hydrogen Gas Detector for Class I, Divisions 1 & 2 flammable environments and facilities that handle or process hydrogen. Equipped with a solid-state sensor, internal relays and a built-in warning alarm, this device operates on 85 V AC to 265 V AC, 50/60 Hz. The detector can be mounted on surfaces, walls, or ceilings using four 3/16" screws.

    The EXP-GS-GPM-B is a hydrogen gas detector for combustible sites and battery storage rooms. This device is compatible with 85 V to 265 V AC, 50/60 Hz and features an 80 dB warning alarm and a 4-second delay upon activation to minimize false readings. Equipped with a solid-state sensor, operators can test the unit via a push-to-test function. The hydrogen gas detector senses concentration levels at 1% and 2%.

    Notification is facilitated by LED status lights and an audible alarm. When the sensor is activated at 1% concentration, the yellow LED light will turn on along with a corresponding relay for activation of a remote, connected device, such as an external alarm or exhaust fan (both not included). At 2% concentration, the red LED light is turned on, along with the built-in warning alarm and corresponding relay (dual-relay model) for remote, connected devices. The sensor also detects decreasing hydrogen gas levels.

    The EXP-GS-GPM-B is Explosion Prevention Systems (NFPA 69, Chap 8) and NFPA 2 Hydrogen Technology Code compliant. This device is non-incendive and meets Class I, Divisions 1 & 2 NEC hazardous atmosphere codes. This detector has been calibrated at room temperature and humidity at sea level. Field calibration is not required.

    Wiring: The EXP-GS-GPM-B contains internal relays and terminal blocks for connections to a preferred single-phase AC power source and remote devices, such as an exhaust fan or external alarm (both not included). An 18G SJT 3-conductor PVC jacket cable for 120V AC electrical connections and 14G wiring for relay connections are recommended. The device`s relay dry contacts are rated at 10 amps/250V AC.

    Mounting: This hydrogen gas detector can be mounted on surfaces, walls, or ceilings using four 3/16" screws. For best results, it is recommended to install the unit at the highest, draft-free section of the room.

    Suggested Applications: Battery-charging rooms, paint spray booths, aircraft maintenance, oil drilling rigs, refineries, solvent and cleaning areas, gas processing plants, chemical manufacturing, waste water treatment plants, offshore applications, and more.

    Returns and Cancellation Notice

    All Larson Electronics orders are subject to a minimum 15% cancellation fee. Larson Electronics UVC products are non-returnable once shipped. If you need help choosing a product, please contact us before ordering.

    About Larson Electronics

    Founded in 1973, Larson Electronic is an industrial lighting company, providing solutions for government, military, aviation, oil and gas, processing, manufacturing, and other markets. The company manufactures power distruction, industrial controls, explosion proof equipment, and UV lighting products in the USA. Larson is also able to provide customized fabrication for complex lighting and power requirements and has over 70,000 square feet of manufacturing and warehouse space.

    Concentration Thresholds1%, 2% (Increasing/Decreasing)
    Dimensions7" x 4.75" x 2.25"
    Frequency50/60 Hz
    Gas TypeHydrogen
    MountingSurface, Wall, Ceiling - (4) 3/16" Screws
    Sensor TypeSolid State
    Volts85-265 VAC
    Warning Alarm80 dB

    ProLampSales Order Code7668704215294
    BrandLarson Electronics


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    Expedited Shipping Rates

    For expedited shipping, please contact us for a price quote and cutoff times.

    Continental United States

    • Shipping for most orders is calculated at checkout*
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    *Certain restrictions apply, including oversize, heavy objects, and some fixtures/equipment.

    For large, heavy, or oversized items, additional shipping charges may apply. The site may not correctly calculate freight shipments at time of order. Large counts of smaller products may also result in additional shipping costs. We apologize for any inconvenience this may cause. Please contact us for an estimate on large items to determine an accurate shipping cost.

    Alaska & Hawaii

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    US Territories

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    International Shipping

    Contact us for a quote. We do not ship most glass bulbs and fixtures internationally. If you have your own UPS/Fedex/DHL account, we may be able to ship using that.

    Shipping to US-Based Freight Forwarders

    For shipments to freight forwarders, we are only responsible for shipping to the freight forwarder directly. Please have your freight forwarder check your items for damage. We are not responsible for shipping damages incurred at or after the items leave the freight forwarder.

    Business Office Hours

    We can be reached by phone (800-784-1998) weekdays from 7:30am to 5pm Pacific Time.

    Our business office is closed Saturday and Sunday throughout the year, Memorial Day, Fourth of July, Labor Day, Thanksgiving day, Christmas day and New Year's day.

    Orders can be placed on the website at anytime - 24/7.

    California Title 20 Notice

    Certain general service lighting products are no longer allowed to be sold in California. We make every attempt to inform you before purchase which items are unable to ship to California. If we discover an item you purchased can not be shipped, we may have to cancel the order. We apologize for any inconvenience this causes. Please contact your state representative for more information.

    California Prop 65

    California Prop 65 WarningWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

    Returns Policy

    Returns are sometimes necessary. Our policy is to provide you with a hassle-free return experience.

    Accepted Returns

    Items Damaged in Shipping

    If the product was damaged during shipping, first keep all packing materials, then call or email us to report the damage. Damage must be reported with 3 days of you receiving the shipment. We will have you return the product using the Returned Material Authorization (RMA) we will provide. We will send you a new product or provide a full refund and we will reimburse you for any shipping charges you may incur.

    Missing Items

    If all the items you ordered are not in the shipment, call us within 3 days of receiving the shipment so we can promptly send the missing item(s).

    Wrong Product Ordered or Product No Longer Needed

    If you ordered the wrong product call or email us so we can help you get the correct product. If the product purchase error was in no way the fault of information provided on ProLampSales.com, you are responsible for the return shipping cost and a 25% re-stocking fee.

    30 Day Return Policy

    Items ordered from ProLampSales can be returned within 30 days of receipt of the shipment in most cases. Please check that all of your items are present and in working condition within this timeframe.

    After 30 days, if the product does not perform to specifications or fails within stated warranty periods, see manufacturer warranty information for procedures to follow.

    Products that Differ from Our General Return Policy

    International Orders

    International orders are non-returnable.

    Gas Detectors & Air Quality Monitors

    For safety reasons, we do not accept returns on gas detectors or air quality monitors. Once these products leave our warehouse, we can not be sure what environments they are used/stored in or what dangerous gases or pollutants they are exposed to.

    Larson Electronics

    Larson Electronics UVC lighting products of any kind are non-returnable. Larson Electronics orders are subject to a minimum 15% cancellation fee. If you need help with a product, please contact us before ordering or verify that you are ordering the correct item.


    Non-Quick Ship Soraa brand products are non-returnable. If an error was made in order fulfillment or shipping, replacements may be sent out or a refund issued.

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