Standard Horizon HX400IS Intrinsically Safe Marine VHF

The Standard Horizon HX400IS marine VHF radio is built to operate inside areas where flammable gases or vapors may be present, and that single fact defines its place in the Risys lineup right now. It carries an intrinsically safe rating under ANSI/UL913 5th Edition, covering Class I, II, and III Division 1, Groups C, D, E, F, and G, at temperature code T3 — a certification that permits use in locations classified as hazardous, such as fuel transfer areas, drilling platforms, and gas storage terminals. The set covers the marine VHF band from 156.025 to 163.275 MHz plus a land-mobile radio range from 134.000 to 174.000 MHz, transmitting at 5 W on high power and 1 W on low power from a 7.4 V DC supply. This intrinsically safe classification is the axis that sets the HX400IS apart within the marine radio category.

How the Standard Horizon HX400IS Marine VHF Radio Performs in the Field

The radio holds 40 programmable LMR channels on 25 kHz and 12.5 kHz steps, plus the full set of US, international, and Canadian marine channels together with NOAA weather channels, so it is ready for standard marine communication networks without extra channel programming. Power comes from a 2300 mAh Li-Ion battery pack, model FNB-115LiIS, itself certified under the same intrinsically safe rating as the radio body, meaning any replacement pack has to be the same model to keep the certification intact. The unit is rated IPX8, submersible to 1.5 m for 30 minutes, a level of protection built for accidental drops into water on deck or at the dock rather than casual splash exposure alone. On the RF side, receiver sensitivity is 0.25 µV at 12 dB SINAD, adjacent channel selectivity is 70 dB in wide mode and 60 dB in narrow mode, and frequency stability holds at ±2.5 ppm across the -30°C to 60°C range, matching the radio’s overall operating temperature spec. The unit weighs 350 g with its battery fitted, and the case measures 57 x 133 x 40 mm excluding the knob and antenna, keeping it a one-hand-portable set for long duty periods. It transmits analog FM only, with no digital mode support.

Where the HX400IS Fits Saudi Marine and Industrial Operations

The intrinsically safe rating puts this radio in play for sectors that require wireless communication inside zones classified as hazardous, including oil refining sites and LNG export terminals along the Arabian Gulf and Red Sea coasts, where equipment not certified for Class I, II, and III Division 1 environments is typically excluded from those areas. On the commercial marine side, the full set of international and Canadian marine calling channels plus NOAA weather channels supports coordination between crews, port authorities, and vessel traffic control along the Saudi coastline, from Jeddah Islamic Port to the Gulf ports. The IPX8 submersible rating suits maintenance work on deck, on fishing boats, and on landing platforms where the radio is exposed to spray and occasional immersion. Safety and emergency teams at desalination plants and coastal industrial facilities that combine liquids with flammable vapors are another practical fit, given the certified intrinsically safe rating carried by both the radio and its battery pack.

Selecting the Right Radio Within the Marine VHF Category

The HX400IS currently sits in the Risys catalog as a standalone unit within the marine two-way radio category, and its differentiating axis is its own specification set around intrinsic safety rather than a direct comparison against a sibling model listed in the category today. The deciding factor for selection is the work environment: where operations fall inside zones formally classified as hazardous due to flammable gases or vapors, the ANSI/UL913 certification and the matched FNB-115LiIS battery make this the radio that meets that requirement, unlike a standard marine VHF radio without that rating. Where the work environment is ordinary marine use without a hazardous-area classification, the radio’s core specifications, namely full marine channel coverage, IPX8 protection, and the dual marine/LMR frequency range, remain useful, but they are not the specific reason to choose this unit over another marine radio available on the market.

Deployment Notes

The radio ships with its FNB-115LiIS battery pack, a PA-45 charger, a CD-50 charging cradle, a CAT460 antenna, a CLIP-22 belt clip, and a hand strap, enough to put the unit into service without sourcing extra accessories. Because it transmits analog FM only, it fits networks built around standard marine calling channels and analog programmable channels rather than digital radio systems. When operating inside a classified hazardous area, only the certified FNB-115LiIS battery pack should be fitted, since swapping in an uncertified pack voids the intrinsically safe rating for the whole unit. The -30°C to 60°C operating range covers both hot coastal summer conditions and cold storage or chiller environments where the radio might also see use, while the ±2.5 ppm frequency stability holds channel accuracy across that full thermal range.

Package Contents

• FNB-115LiIS Li-ion battery pack
• PA-45 charger
• CD-50 charger cradle
• CAT460 antenna
• CLIP-22 belt clip
• Hand strap