chm power point presentation

7/28/2019 CHM Power Point Presentation

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Suparule Cable Height Meter:

A guide

Jan 2012


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Key Features:Safest - no contact with conductors/wireSimple - One button- one man operationEasy to use - stand underneath, press the button, andread the measurement

Fast - measurements in secondsAccurate - less than 0.5% error in reading

Suparule Cable Height MetersCable Height Meteran ultrasonic device to check wire clearance to ground and

spacing of overhead conductors.


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Why was the CHM developed?

Low wires are a public safety problem

Many reported accidents with both electrical and telecomwires

Existing measuring methods were not considered safeenough for operators


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Competitive Instruments

Laser type surveying equipment. (Very expensive, and notapplication specific)

Fibre-glass hot sticks (frequently breaks, conveyselectricity if dirty/wet)

Optical device (inaccurate, cannot differentiate betweenconductors)

No real competitive instrument to the CHM


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Ultrasound Measurement From the cone of instrument, the transducer sends out a burst of sound

The sound bounces off the cable, and need to be received in cone, as

transducer is at the same time transmitter & receiver.

The CHM clocks the amount of time taken

Calculates distance, based on speed of sound. Adjusts for air temperature.

The microcontroller calculates the distance in either imperial or metric

Instrument Time Echoes from wires


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How to use of Cable Height Meter

CHM Operation

1.Select: M (metric) orI (imperial) at the back2.Set the CAL mode switch to the WIRE

position.

3.Press the ON key to power4.Stand directly underneath the conductors(s)

to be measured.

5. Press the MEASURE Key to takemeasurement. Press the READ key todisplay each of the stored wire height

differences (Stored Measurements).


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Cable height meter: CAL (Calibration) Mode The CAL mode switch allows the user to periodically check the unit,

to ensure that it is still operating within specification.

For cable height measurement, this switch should be in the WIREposition.

When the switch is put to the WALL (CAL) position horizontalmeasurements to large objects, e.g. walls, can be taken.

When the unit is first used, a horizontal reading to an object, e.g. wall,from a fixed position should be taken. The reading should berecorded, together with the date. Whenever the unit is to be checkedfor accuracy, a reading should be taken from the same point, noting

the result and date. If the reading is outside of specification, the unitshould be returned to Suparule. Date

Readings


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Range Specification of the CHM 190-300-600

measures up to 15m (50ft)


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Range Specification of the CHM 300E-600E

measures up to 23m (75Ft)


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Cable height meters: Model choiceCHM models 300 300E 600 600E

Range (25mm cable

min) 3 15m(10-50ft) 3 23m(10-75ft) 3 15m(10-50ft) 3 23m(10-75ft)Range (12mm cablemin) 3 15m(10-50ft) 3 15m(10-50ft) 3 15m(10-50ft) 3 15m(10-50ft)Range (5.5mm cable

min) 3 12m(10-40ft) 3 12m(10-40ft)Range (2.5mm cable

min) 3 10m(10-33ft) 3 10m(10-33ft)No. of wires

measured 3 3 6 6


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Just simply stand under the O/H line, center yourself under the

conductors and press the button.


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Reading #1 gives the height to the lowest conductor


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Reading #2 gives the distance between 1st and 2nd wire


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Reading #3 gives the distance between 2nd and 3rd wire


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Reading #4 gives the distance between 3rd and 4th wire


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The memory stores the measurements so that you can scroll

through them in order to record them on paper etc.


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By pressing button once, readings of up to 6 conductors aretaken provided the wires are all within the ultrasonic beam


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CHM & Ultrasonic beam Push Measure button once, provided wires are within

the ultrasonic beam.

If not, take a number of readings underneath each ofthe wire.

Make sure the cone is perpendicular

to overhead wire, as otherwise

reflection will not be received

in cone.


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CHM Accuracy : Error typically less than 0.5% +/-2digits

If the actual distance being measured is 5m, tolerance of +/-0.5%, the CHM will give a reading between 4.975m and 5.025m

The Number of digits specification is an extra tolerance on thedisplay reading. 2 digits = 10mm. The +2d specificationtherefore means that a further +/-10mm can be added to thedisplay reading, i.e. 4.965m and 5.035m.

Accuracy is met when CHM is regularly calibrated. Bestpractice require a 12 month calibration.


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CHM Battery

Battery Life 50,000 measurements

Battery used: 9V, PP3, non-rechargeable, Alkaline, Long-life (>600mAH)

The cable height meters automatically switch off after3mn if no buttons are pressed to save battery.

When battery is low, a low battery warning symbol popup on screen: Need to change the battery.


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Do & Dont with CHMDos:

Position the unit on the ground, directlyunderneath the conductor(s) to bemeasured.

Align the unit in the direction of the

conductor, with the cone pointing towardsthe conductor(s).

The ultrasonic waves need to be sent andreceived in the cone, so alignment isimportant.

Keep the unit dry; if it does get wet, leave itupside down in a warm area

The unit will work in a humid environment;however, if water gets into the electronics,long-term damage can occur.

Donts:

Avoid clutter.

Too many branches/leaves couldconfuse the unit, as the ultrasonic waveswill bounce back from any obstacles.

Avoid water.

It can damage the electronics

Avoid sudden changes of temperature.

The Cable Height Meter takes intoaccount temperature to measure thespeed of sound travelling in air. If there

are sudden temperature changes, i.e.from a warm car in winter to cold icyground, leave the unit to adjust for a fewminutes.


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Suparule Cable Height Meters :Get the most out of CHMs

1. Let temperature settle, otherwise incorrect reading is displayed.

2. Press measure button until reading is stable. Unit needs to get aclear/clean echo back, to calculate correct distance.

3. Make sure echo gets back into cone, as otherwise, unit will notdisplay reading. May need to tilt unit to get a reading if overheadwires are sloped.

4. CHM is not waterproof, so keep unit dry as much as possible. Ifwet, leave it in a warm place upside down, until dry.

5. Regular calibration a must to get best accuracy


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Who uses the CHM?

Planners

Safety Officers

Line Managers

Linesmen / Installers

Contractors

Haulage companies

Regulatory Inspectors


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Warranty & Repair

The CHM is covered by a 24 month warranty on all partsand labour

Any defective instrument will be replaced free of charge

during this period Damaged or broken instruments will be repaired and

charged at cost

Each instrument is pre-set, and calibrated at Suparule

Service contract available, please contact your

distributor/suparule.


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Suparule Cable Height Meters

No better instrument for wire distance measurement

Your key partner to safety

Order NOW

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