Hindustan Scale Company · Est. 1955Wireless crane scales — safe-distance readout

The scale that lives outdoors needs to be sealed and still heard.

India’s twelve major ports moved 854.86 million tonnes of cargo in 2024-25, according to the Ministry of Ports, Shipping and Waterways, and about 75 % of the country’s rain falls in four monsoon months, according to the India Meteorological Department. A crane hook at a port, a fishing harbour or a coastal scrap yard works in both. A waterproof crane scale is what buyers ask for — and “waterproof” is really three questions. Is the hook unit sealed? Will its body survive salt? And can its reading still reach the operator, wirelessly, through the rain? Here are the three, the questions to put to any supplier, and a thirty-day trial.

CRHSSWR Series Stainless Steel Water Proof Crane Scale - the HSCo product this paper is about.
The hook unit stays out in the monsoon; the number reaches the operator under the eave. Sealed, and still heard.

An IP rating is two tests, not one word

“IP68” is not a grade of toughness. It is the result of two separate tests defined by IEC 60529 — adopted in India as IS/IEC 60529:2001, which replaced IS 12063. The first digit is dust. The second is water. Each is earned on its own bench.

Digit What the standard promises The test as written in IS/IEC 60529
6 (dust) Dust-tight — “no ingress of dust” Talcum-powder chamber, 2 kg of powder per cubic metre, a vacuum drawn on the enclosure, up to 8 hours
X6 (water) Powerful jets from any direction 12.5 mm nozzle, 100 litres a minute, from 2.5–3 m, for at least 3 minutes
X7 (water) Temporary immersion Lowest point 1 m under water, 30 minutes
X8 (water) Continuous immersion Deeper or longer than X7, on terms “agreed between manufacturer and user”

Two things follow. “IP68” on its own does not say how deep or for how long — the manufacturer sets that, so ask. And a crane scale has two enclosures: the hook unit that hangs in the weather, and the hand-held or desk indicator that lives with the operator. Each needs its own digits. Hindustan Scale Company rates its CRHSSWR stainless-steel crane scale IP68 and its hand-held wireless display “IP65 or higher”; the standard CRH electronic crane scale, aluminium-bodied with a rust- and corrosion-resistant coating, is the dry-bay workhorse. For the digit basics, see HSCo’s explainer Waterproof Scales & IP Rating Explained.

Is an IP68 waterproof crane scale hose-proof?

Not automatically.

In IEC 60529 the water digits are cumulative only up to 6. Clause 6 says an enclosure marked 7 or 8 alone “is considered unsuitable for exposure to water jets” unless it is dual-coded — written IPX6/IPX8, say. The US body NEMA restates the rule in its own enclosure guide.

Three more facts matter in a yard. The rating is a type test on a clean, new sample. The immersion water must be within 5 °C of the unit — a hook unit hosed cold after a hot afternoon is outside the test. And the standard’s own scope note excludes corrosion, corrosive vapours, condensation, icing and mechanical damage. The two digits promise a seal. They promise nothing about salt.

The question list for any supplier, us included:

  1. Which enclosure is rated? The hook unit, the indicator, or both — and to what digits each.
  2. How deep and how long does your “8” mean?
  3. If we hose or pressure-wash the hook unit, does the rating cover jets as well as immersion (a dual code such as IPX6/IPX8), or has the separate hot high-pressure test been done?
  4. What is the body made of, and which grade? That is the salt question, and it is next.
Diagram: the hook unit on the crane and the hand-held indicator with the operator face different hazards and need separate IP ratings, joined by a line-of-sight radio link through a non-metal antenna window
The hook unit faces rain, hose-down, salt and sun; the readout faces condensation, dust and knocks. Rate each on its own — and ask how the radio gets out of a steel body.

Salt is a material question, not a sealing question

Salt air is a classified hazard, not an adjective. The international corrosivity standard, ISO 9223, grades atmospheres from C1 to C5 plus CX by how fast steel and zinc coupons corrode in their first year, driven by time of wetness, sulphur dioxide and airborne salt. As the UK Steel Construction Institute reproduces the table, a coastal area with low salinity is C3 (bare steel losing 25–50 micrometres a year), moderate salinity C4 (50–80), high salinity C5 (80–200) and offshore CX (200–700). Treat the bands as indicative: a port, fishing harbour or coastal scrap yard is C4–C5 territory, but a category needs a site survey. Sea spray attacks even galvanising: chlorides dissolve zinc’s protective film, the American Galvanizers Association notes. The bill is real — the NACE IMPACT study put the global cost of corrosion at 3.4 % of world GDP, with 15–35 % of it avoidable by known practice.

Figure: bare steel loses 25-50 micrometres a year in a low-salinity coastal area, 50-80 at moderate salinity, 80-200 at high salinity and 200-700 offshore, indicative bands
From a low-salinity coast to a high-salinity one, bare steel corrodes up to four times faster. ISO 9223 / ISO 12944-2 bands as reproduced by the Steel Construction Institute — indicative; a category needs a site survey.

That is why “stainless” is a question, not an answer. The British Stainless Steel Association is blunt: grade 304 “should not be considered suitable for seawater service”; 316, the molybdenum-bearing grade, is the default in every marine environment, because molybdenum resists the chloride pitting that eats stainless from a single point. The International Molybdenum Association agrees. Even 316, the BSSA adds, “cannot be considered corrosion proof” in seawater and shows “tea staining” if it is not washed. HSCo’s CRHSSWR has a stainless-steel body; ask any supplier, us included, which grade, in writing — and rinse the unit after salt exposure.

One number to distrust: “passes 500 hours salt spray”. The salt-spray test (ASTM B117, ISO 9227) fogs a salt mist over a sample in a chamber, and ASTM’s own scope says “prediction of performance in natural environments has seldom been correlated with salt spray results when used as stand alone data”. It sets no exposure period and no pass mark: a quality-control comparison, not a life prediction. Ask instead for the grade and a reference site in the same environment.

Rain does not break the radio. Metal and wet surfaces do.

Buyers worry that a downpour will cut the link. It will not. Derived from the ITU rain model (Recommendation P.838-3), a 100 mm/h cloudburst costs a 2.4 GHz link about 0.02 dB per kilometre — about 0.004 dB over a 200 m yard link, which is nothing; rain fade becomes serious only above about 10 GHz. Three other things do break the link.

The sealed metal body. Steel is opaque to radio: worked from the ITU’s building-materials model (P.2040-4), 2.4 GHz penetrates it a few micrometres, and the US NIST guide to industrial wireless (2018) notes that conductive materials reflect nearly all the energy. A stainless hook unit therefore needs a non-metal antenna window or an external antenna; ask which.

Water on and around the path. The same NIST guide lists “liquids including fog” as significant absorbers. Worked from the ITU table, wet ground absorbs roughly a hundred times more than dry ground at 2.4 GHz, and a water film on the antenna itself is a known extra loss.

Line of sight. The 2.4 GHz band has been licence-free in India since the Department of Telecommunications’ GSR 45(E) of 28/01/2005 — on a shared, non-protection basis. Nobody guards it for you, so the design answer is a link that hops channels and acknowledges every reading. HSCo’s readouts are all line-of-sight company figures: a remote desk display up to 200 m, a hand-held unit up to 30 m, a jumbo wall display up to 20 m, and Bluetooth to the HSCo Android or PC app. Plan the reader’s position before the hook’s.

Yard supervisor in a rain shell reading a hand-held crane-scale display under the eave of a site cabin while the crane works across a wet port yard
Thirty metres of rain between the hook and the hand-held, and the number still arrives. Plan the reader's position before the hook's.

What a waterproof crane scale is not

It is not a weather certificate. The international type-approval recommendation for weighing instruments, OIML R 76-1 (2006), the basis of Indian model approval, requires accuracy between −10 °C and +40 °C unless other limits are marked, and tests electronic instruments for two days at the upper temperature and 85 % relative humidity — with condensation on the instrument forbidden. It contains no rain, hose or immersion test. A stamped scale weighs correctly; whether it is waterproof is proven only by the separate IP test.

It is not the crane’s safe-load indicator. The dock-safety regulations require a crane with a variable safe working load to carry its own automatic indicator that warns the operator. A crane scale weighs the load; it does not replace that.

It is not corrosion-proof. Even the right grade stains in salt if it is never rinsed. Sealing and corrosion resistance are two purchases inside one product — and a salt-spray figure compares batches, it does not predict years.

What changes for you on Monday morning

  1. You weigh in the weather. The hook unit stays on the crane through the monsoon; nobody carries it in at the first drop.
  2. The operator reads from shelter. The number arrives on the hand-held or desk display, away from the load and out of the rain.
  3. The register gets defensible numbers. Under the dock-safety regulations — now continued under the Occupational Safety, Health and Working Conditions Code, 2020, in force since 21/11/2025 — every lifting appliance is tested by a competent person before first use and at least every five years, thoroughly examined at least every 12 months, entered in a register kept for five years, and never loaded beyond its marked safe working load. The test weights must themselves be checked on a weighing machine of certified accuracy. A crane scale that survives the yard is part of that calendar, not an extra.
  4. One rinse a shift replaces one replacement a year. A fresh-water rinse after salt exposure is the cheapest maintenance in the yard.

How to start: one hook, thirty days

  1. Pick the wettest hook — the one whose scale is carried indoors when it rains, or whose body is already staining.
  2. Write down its world: hosed or pressure-washed? Salt air? How far is the reader?
  3. Put the four questions to your supplier and get the answers in writing — digits per enclosure, depth and time for the 8, jets or not, the body grade.
  4. Fit the unit. Rinse it with fresh water at the end of each shift. Log every reading that reaches the display, and every one that does not.
  5. After thirty days, check dropped readings, staining on the body and hours per charge. Roll out only what the log justifies.

Hindustan Scale Company has made weighing instruments in Mumbai since 1955 and builds the CRHSSWR stainless-steel waterproof crane scale itself: a stainless-steel body the company rates IP68, capacities of 3,000 to 50,000 kg, a steel-alloy load cell with a 200 % overload margin, 40 hours and more per charge, a 4-inch jumbo green display and a one-year warranty. Indicative prices before GST run from about ₹36,500 to ₹3,29,000; a double J-hook version exists for the same duty. For a dry bay the aluminium-bodied CRH costs less; the full crane scale range and waterproof scale range are on the site.

Frequently asked questions

What does IP68 mean on a crane scale?

Two separate tests under IEC 60529 (IS/IEC 60529:2001 in India): the 6 means dust-tight, proven in a talcum-powder chamber with a vacuum on the enclosure; the 8 means continuous immersion deeper or longer than the 1 m / 30 minute test for a 7, on terms the manufacturer sets. Ask how deep and for how long.

Can I hose down or pressure-wash an IP68 crane scale?

Only if the rating says so. In the standard, water digits are cumulative only up to 6, and a unit marked 7 or 8 alone is “considered unsuitable for exposure to water jets” unless it is dual-coded, such as IPX6/IPX8. Ask any supplier whether jets were tested, and whether the separate hot high-pressure test was done, before the first wash-down.

Do I need a stainless-steel crane scale for a port or fishing harbour?

Usually, and the grade matters more than the word. The British Stainless Steel Association says grade 304 is not suitable for seawater service, and 316 is the default in marine environments because its molybdenum resists chloride pitting. Even 316 is not corrosion-proof; rinse the unit with fresh water after salt exposure.

Does rain affect a wireless crane scale’s signal?

Barely. Derived from the ITU rain model, even a 100 mm/h cloudburst costs a 2.4 GHz link a few thousandths of a decibel over 200 m. What breaks the link is a metal body with no antenna window, wet surfaces and foliage near the path, and lost line of sight to the reader.

Does a stamped or trade-approved crane scale mean it is waterproof?

No. The international type-approval recommendation, OIML R 76, tests accuracy from −10 °C to +40 °C and at 85 % humidity for two days with no condensation allowed, but has no rain, hose or immersion test. Water-tightness is proven only by the separate IP test.

How much does a waterproof crane scale cost in India?

As an indication, before GST, HSCo’s CRHSSWR stainless-steel waterproof crane scale runs from about ₹36,500 for 3,000 kg to about ₹3,29,000 for 50,000 kg, with a one-year warranty. The exact price depends on capacity and on which wireless readout you pair with it.

Next step

Tell us where the hook works — hosed, salted, and how far from the reader — and we will propose a thirty-day trial on that one hook.

Hindustan Scale Company (HSCo) · Mumbai · est. 1955 · www.hindustanscale.com · hsc@hindustanscale.com

Sources

  1. IS/IEC 60529:2001 — Degrees of protection provided by enclosures (IP Code), BIS adoption of IEC 60529 (current consolidated edition IEC 60529:1989+AMD1:1999+AMD2:2013): Tables 2–3, clause 6 (dual coding), clause 11.2 (type tests), clauses 13.4–13.6 and 14.2.6–14.2.8 (test conditions), clause 1 note (exclusions).
  2. NEMA — NEMA Enclosure Types (November 2005): meaning of the two IP numerals; restatement of the dual-coding rule; IEC 60529 does not cover condensation or corrosive vapours.
  3. ISO 9223:2012 — Corrosivity of atmospheres — Classification, determination and estimation (method and drivers); corrosivity table C1–CX as reproduced by the Steel Construction Institute / BCSA, steelconstruction.info, Corrosion protection.
  4. American Galvanizers Association — In the Atmosphere: chlorides from sea spray and zinc’s protective film.
  5. NACE International (now AMPP) — IMPACT study executive summary (2016); World Corrosion Organization — Now is the Time (G. F. Hays): global cost of corrosion.
  6. ASTM International — ASTM B117-19, Standard Practice for Operating Salt Spray (Fog) Apparatus, Scope; ISO 9227.
  7. British Stainless Steel Association — Selection of 316, 304 and 303 types of stainless steels for seawater applications and Selection of stainless steels for building external applications; International Molybdenum Association — Stainless steel in Architecture, Building & Construction.
  8. ITU-R Recommendation P.838-3 (2005) — Specific attenuation model for rain, Table 5; ITU-R Recommendation P.2040-4 (September 2025) — Effects of building materials and structures on radio-wave propagation, Table 3 and equation (27). Attenuation figures in the article are derived from these coefficients.
  9. NIST Advanced Manufacturing Series 300-4 — Guide to Industrial Wireless Systems Deployments (2018), chapters 2 and 7.
  10. Department of Telecommunications (WPC) — Delicensing in 2.4–2.4835 GHz band, GSR 45(E) of 28/01/2005; TEC essential requirements.
  11. OIML R 76-1 Edition 2006 (E) — Non-automatic weighing instruments, Part 1: clauses 3.9.1.2, 3.9.2.1–3.9.2.2, 5.3.2 and Annex B.
  12. Dock Workers (Safety, Health and Welfare) Regulations, 1990 — Regulations 41, 42, 47, 51 and Schedule I; Factories Act, 1948, section 29; Occupational Safety, Health and Working Conditions Code, 2020, section 143 and Second Schedule (DGFASLI official copies); Press Information Bureau release of 27/02/2026 on the Labour Codes’ commencement.
  13. Ministry of Ports, Shipping and Waterways — Annual Report 2025-26; IBEF — Ports — India Shipping (September 2026): major-port cargo, coastline, share of trade by sea.
  14. India Meteorological Department — Monsoon Report 2025; IMD press release of 14/09/2026.
  15. Hindustan Scale Company — CRHSSWR stainless-steel waterproof crane scale, CRH electronic crane scale and wireless readout product pages; Waterproof Scales & IP Rating Explained (26/02/2025); indicative prices September 2026, before GST.