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Spectrum Metrology ...

 

Surtronic Meters won't measure slip risk

Rz micro roughness is not a direct measure of slip risk, and cannot help you to monitor changes to the slip risk of your floors. Ask the HSE for the latest correlation between roughness and PTV. Roughness cannot detect change to slip risk caused by wear, contamination or other major causes of change to the slip risk of your floors.

 

Rz Supporters won't come clean

If you have been approached by Spectrum Metrology selling Surtronic meters for slip testing then please ask them for any evidence that Rz is a useful measure of slip risk.

 

1. How can Rz micro roughness give a measure of wet slip risk when tests are taken on clean dry floors and the correlation with real slip measures (PTV-correlated measures) is close to zero? (see HSL graph)
2. How can Rz be a useful way of monitoring the slip risk of floors when it cannot detect contamination or any other cause of change to the slip risk of a floor?
3. If Rz microroughness is such a useful measure when taken alongside a real measure of slip risk then why is there no guidance as to how the Rz measure should be used along with a PTV measure. HSE/HSL reports tend to ignore the Rz measure if it disagrees with the PTV measure. How is that useful?

We have had no response to our questions. Rz supporters know it won't measure slip risk.

 

No claims on commercial websites

You will notice that Spectrum the Metrology makes few detailed claims about the value of slip testing with surtronic roughness meters. They make reference to people who use it and imply it must work. In fact, they know that Rz is not a measure of slip resistance, they know it cannot detect contamination or change to slip risk and they know that there is no evidence that measuring Rz adds any useful understanding of floor slip risk.

 

So why are they selling Surtronic meters for slip testing?

You should ask them to justify their actions.

 

Damaging the Surtronic Brand

The HSE now only recommend only two varieties of roughness meter for slip testing. Nearly 100% of SAT users use either the Surtonic Duo or Surtronic 25. We challenge Taylor Hobson and Spectrum Metrology who supply the Surtronic instruments to withdraw from selling roughness meters for slip testing.

 

answer these simple questions:

1) at what level of macro surface roughness is it possible to accurately measure Rz micro roughness? In other words on real floors is it likely that the Surtronic meters are even measuring Rz accurately?

2) Given that Rz measures on real floors do not predict PTV slip risk, why do you sell your precision instruments for slip testing?

3) given that Rz measures do not change in relation to changing slip risk, and that roughness meters cannot detect contamination, why do you sell your roughness meters for monitoring slip risk?

4) Do you have any guidelines for how Rz measures can be used alongside real slip measures? and if not, then why sell your precision instruments as a complimentary measure to be used with PTV?

 

Selling a brand of precision instruments for a purpose it is unsuited will surely damage the brand.

 

We stronly recommend that Rz is not used for measuring or monitoring the slip risk of floors. Taylor Hobson and

 

Roughness measures smooth metal car parts

We suggest that Rz meters should be used only for the measurements on smooth surfaces and not on floors. Roughness meters are generally used on smooth metal such as car parts.

 

100th width of a hair on your floor

Rz meters measure in microns, roughly 100th the width of a human hair. If your floor has macro-roughness, that is roughness or profiling that you can see then it will probably not be possible to get an accurate measure of the micro roughness. If you measure "roughness" on a floor you will probably not even get an accurate measure of Rz and it definitely won't be useful for monitoing slip risks.

 

Drop roughness testing. Get a real slip tester and make your floors much safer

 

 

Kenny

SlipAlert

Measures slip risk

No

Yes

Detects contamination

No

Yes

Monitors change to slip risk

No

Yes

Consistent Results

No

Yes

Monitors cleaning effectiveness

No

Yes

 

If you have bought a roughness meter, we'd like your feedback.

 

Roughness cannot detect contamination

Micro surface roughness measures will remain unaffected by contamination making it useless as a way of measuring the effectiveness of cleaning regimes or as a tool to explain why one area of a floor appears to be a slip hazard.

Try SlipAlert and get up to £900 cashback!

 

Kenny attempts to "predict" slip risk and is usually wrong

 

Rz roughness does not measure pedestrian slip risk, it won’t detect contamination and won’t tell you when the slip risk of your floors changes. It measures one parameter of micro roughness and tries to predict wet slip risk from 10 random numbers. It’s like using Kenny the "fake slip test" instead of watching Final Score or Match of the Day! Read the claims for kenny carefully. You'll notice that Rz "may" give an indication of slip risk... in the same way that a broken watch "may" tell the right time.

Get your money back...

 

Beware of misleading claims about roughness

You need to be very careful when reading the claims about roughness measurement as a means of monitoring slip risk of floors. Some of the claims about roughness are very misleading.


"Surface microroughness can give an indication of the slip resistance of a floor when contaminated"

 

If the sellers of roughness meters made this claim it would be illegal, for it is very misleading. Rz micro roughness is not a measure of slip risk and it cannot detect contamination. Roughness measures are taken on a clean dry floor so there is never a direct measure of the slip resistance of the contaminated floor. A theory that Rz measures will predict wet slip risk has been shown to be wrong. The idea that Rz measures will predict other contamination is nonsense. Roughness can only give an indication of slip risk in the same way that a broken watch "can" give an indication of the correct time if you are lucky and only look at it when it is near the correct time. If you find any misleading claims like this made by people selling roughness then please report them to Trading Standards or contact Jenny.

 

More misleading claims about roughness

The following claim about roughness is technically correct, but on a web page about preventing slip risk it would be illegal if a commercial organisation made this claim.


"You can often use a surface roughness meter in areas where traditional slip resistance tests can't be used or may provide misleading results, e.g. stairs. "

 

It is true that roughness can be measured in small spaces, but it is not true that it will measure slip resistance and the implication that roughness may therefore be better than a traditional measure of slip resistance is misleading nonsense.

 

If you find any misleading claims like this made by people selling roughness then please report them to Trading Standards or contact Jenny.

 

Yet more misleading claims about roughness

This is another very misleading claim about roughness and implies that roughness can be used to monitor changes to slip risk of your floors.

 

"Taking surface microroughness measurements is quick and easy, making it an ideal way to monitor changes in surface finish."

 

If you read carefully you will see it says that roughness measures changes to "surface finish ", but on a web page about monitoring changes to slip risk of floors this is very misleading. In fact roughness cannot be used to measure change to slip risk caused by contamination or wear or any of the known causes of change to the slip risk of floors. Roughness measures are taken on clean dry floors and the roughness meter will not detect contamination. There is no correlation between change to roughness and change to the slip risk of floors caused by wear. The above claim is unfounded, and deliberately designed to mislead the unwary. It is in effect a dangerous lie. The above statement would be illegal if it appeared on website or sales literature from a commercial business selling roughness. If you find any misleading claims like this made by people selling roughness then please report them to Trading Standards or contact Jenny.

 

A misleading claim about roughness that you should question...

If you see anyone claim the following about roughness then please ask them how to use the roughness measure in conjunction with a measure of coefficient of friction.

 

"Surface microroughness is a good complementary measure if used with SAT or in conjunction with an appropriate coefficient of friction test "

 

This statement is nonsense unless someone can tell you how to use the roughness measure along with the real measure of slip risk. In HSE reports that we have seen, the HSE recommend ignoring the roughness measure if it disagrees with the real measure of slip risk. Not sure how that helps. If you ever find anyone who offers a practical use for the roughness measure then please contact Jenny.

 

If you have a roughness meter what can you do?

Please do not use your roughness meter to measure the slip risk of floors. It is very likely that you will get misleading results. 3 things to do with a roughness meter

 

Roughness "predicts" vs SlipAlert measures

On a Saturday night would you rather guess the football scores or watch Match of the Day? Kenny the psychic roughness meter predicts wet slip risk it doesn't measure it. SlipAlert makes quick and accurate measures of your floor. You can test different locations, wet areas, dusty areas, worn areas and get accurate measures in seconds. Guess with Kenny or buy the world's best slip meter. To find out more contact SlipAlert

 

 

Have you been sold roughness testing?

If you have bought a roughness meter or paid for roughness testing of your floors then we'd like to talk to you. Please contact Jenny@slipalert.com or click here.

 

 

SlipAlert more accurate and detects contamination

Watch the HSE video.

contact SLipAlert SlipAlert prices for purchase or lease hire SlipAlert lease hire from £100 per month

 

watch SlipAlert on wet and dry floor - see the difference

 

Roughness and Pendulum

Measures of roughness have poor correlation with the Pendulum. To read more about why it roughness is of little value in floor safety testing click here.

 

RZ and RA Roughness

Rz and RA are 2 forms of roughness measurement neither correlates well with the Pendulum and neither will tell you anything about contamination.

 

Roughness and poor cleaning...

Contamination makes no difference to the roughness measure of a surface, and so measuring roughness offers no value in testing your cleaning regime.

 

Slip Accident Blackspot and roughness

From time to time an area of your floor may become a slip accident blackspot. When you first observe a slip or a small number of slips i the same area of floor, you may wish to test the area of floor to discover if that area of floor has become dangerous. It may have been caused by a spill that has not been cleaned properly and has made that area of floor slippery. In these situations roughness measures will not help you. You need SlipAlert.

contact SLipAlert SlipAlert prices for purchase or lease hire SlipAlert lease hire from £100 per month

 

Roughness, spills and contamination

Spills and contamination are one of the biggest causes of floors becoming slippery. Roughness cannot measure contamination on a floor.

 

Roughness and SAT

The HSE suggest using roughness measures with SAT, the Slips Assessment tool. Hover the logic for SAt was based on the PTV values of 20 = poor slip resistance and 40 = very good slip resistance. click here to find out more about using SAT with SlipAlert.

 

SlipAlert / Pendulum and SAT

The SAT programme uses these points of reference and a notional correlation of 2:1 between Rz and PTV. It would make more sense to use pendulum-correlated vales (from a Pendulum or SlipAlert) and then half the value and enter into SAT.

Rough Luck...

A floor being rough does not mean that it is not slippery. Nor is it always true that a floor that is smooth must necessarily be slippery. Some of our clients have discovered this to their cost. Don't trust your luck by measuring roughness when you can get a much more reliable and accurate reading from your SlipAlert.

 

Kenny Surtronic Duo

Taylor Hobson Surtronic Duo is the biggest selling Rz meter used for floor testing. Until March 2009 it was the only Rz micro surface roughness meter recommended by the UKSRG. the kenny is supplied by Spectrum Metrology and by Watco. You should know that Rz microroughness does not measure slip resistance, Rz cannot detect contamination, and Rz cannot measure changes to the slip risk or your floors.

SlipAlert

contact SLipAlert SlipAlert prices for purchase or lease hire SlipAlert lease hire from £100 per month

 

 

Floor maintenance is an opportunity to reduce slip accidents an effective cleaning regime that you can easily manage that also reduces slip accidents save money on floor maintenance save money on your cleaning without sacrificing floor safety save time monitoring an effective cleaning regime Save Time when purchasing, specifying, installing a new floor Slips can be a big headache for H&S managers, now you can save time and enjoy easy ways to improve floor safety SlipAlert helps many aspects of operations management and that can save you time and avoid needless operations headaches Using SlipAlert to check new floors will save you time and money and will reduce slip accidents SlipAlert can save you money and reduce the headaches that slips cause for Operations Managers Save money and implement more effective H&S policies that reduce slip risk SlipAlert can help you to improve floor maintenance, improve floor safety and reduce costs saves you money when specifying, buying or installing a new floor Helping Ops managers to reduce slip risk,  reduce slip accidents and reduce slip injuries Helping H&S managers to raise awareness of slip risks and implement effective policies that reduce slip accidents new floor: save time, save money, prevent slip accidents SlipAlert saves you time with new floors, floor maintennace, H&S, Ops, and floor maintenance floor safety home

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SlipAlert is the easiest, most reliable way to check that your floors are safe.

 

SlipAlert better than roughness... (HSE)

“SlipAlert is able to distinguish between a given floor surface in clean condition and in a contaminated condition. This is a key advantage of SlipAlert compared with using surface micro roughness and makes it ideal for monitoring the effectiveness of cleaning” UK HSE

 
 

Rz Roughness is not a measure of slip risk...

If you thought roughness was a measure of floor slip risk, then get your money back.

 

Latest HSE data shows Rz does not measure slip risk

The latest HSL graph shows that Rz predicts slip risk categories (1 in 3 chance) about 33.4% of the time. Almost a perfect guess.

SlipAlert is far better than roughness

Rz roughness does not measure slip resistance

 

Rz micro roughness does not measure slip resistance. Measures are taken in the dry and supposed to predict wet slip risk, but even that doesn't work. There appears to be no useful correlation between roughness (Rz) and PTV (Pendulum Test Values) and roughness cannot detect change to slip risk making it useless as a means of monitoring your floors.

 

3 things to do with a roughness meter

 

 

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