Transcript Vorstellung einer Neuheit

Suparule Cable Height Meter:
A guide
Jan 2012
Suparule Cable Height Meters
Cable Height Meter –
an ultrasonic device to check wire clearance to ground and
spacing of overhead conductors.
Key Features:
Safest - no contact with conductors/wire
Simple - One button- one man operation
Easy to use - stand underneath, press the button, and
read the measurement
Fast - measurements in seconds
Accurate - less than 0.5% error in reading
Why was the CHM developed?
• Low wires are a public safety problem
• Many reported accidents with both electrical and telecom
wires
• Existing measuring methods were not considered safe
enough for operators
Competitive Instruments
• Laser type surveying equipment. (Very expensive, and not
application specific)
• Fibre-glass hot sticks (frequently breaks, conveys
electricity if dirty/wet)
• Optical device (inaccurate, cannot differentiate between
conductors)
• No real competitive instrument to the CHM
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
How to use of Cable Height Meter
CHM Operation
1. Select: M (metric) or I (imperial) at the back
2. Set the CAL mode switch to the WIRE
position.
3. Press the ON key to power
4. Stand directly underneath the conductors(s)
to be measured.
5. Press the MEASURE Key to take
measurement. Press the READ key to
display each of the stored wire height
differences (Stored Measurements).
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 WIRE
position.
• When the switch is put to the WALL (CAL) position horizontal
measurements 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 be
recorded, together with the date. Whenever the unit is to be checked
for accuracy, a reading should be taken from the same point, noting
the result and date. If the reading is outside of specification, the unit
should be returned to Suparule.
Date
Readings
Range Specification of the CHM 190-300-600
measures up to 15m (50ft)
Range Specification of the CHM 300E-600E
measures up to 23m (75Ft)
Cable height meters: Model choice
CHM 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 cable
min)
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
Just simply stand under the O/H line, center yourself under the
conductors and press the button.
Reading #1 gives the height to the lowest conductor
Reading #2 gives the distance between 1st and 2nd wire
Reading #3 gives the distance between 2nd and 3rd wire
Reading #4 gives the distance between 3rd and 4th wire
The memory stores the measurements so that you can scroll
through them in order to record them on paper etc.
By pressing button once, readings of up to 6 conductors are
taken provided the wires are all within the ultrasonic beam
CHM & Ultrasonic beam
• Push Measure button once, provided wires are within
the ultrasonic beam.
• If not, take a number of readings underneath each of
the wire.
• Make sure the cone is perpendicular
to overhead wire, as otherwise
reflection will not be received
in cone.
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 the
display reading. 2 digits = 10mm. The +2d specification
therefore means that a further +/-10mm can be added to the
display reading, i.e. 4.965m and 5.035m.
• Accuracy is met when CHM is regularly calibrated. Best
practice require a 12 month calibration.
CHM Battery
• Battery Life 50,000 measurements
• Battery used: 9V, PP3, non-rechargeable, Alkaline, Longlife (>600mAH)
• The cable height meters automatically switch off after
3mn if no buttons are pressed to save battery.
• When battery is low, a low battery warning symbol pop
up on screen: Need to change the battery.
Do & Don’t with CHM
Do’s:
Position the unit on the ground, directly
underneath the conductor(s) to be
measured.
Align the unit in the direction of the
conductor, with the cone pointing towards
the conductor(s).
The ultrasonic waves need to be sent and
received in the cone, so alignment is
important.
Keep the unit dry; if it does get wet, leave it
upside 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.
Don’ts:
Avoid clutter.
Too many branches/leaves could
confuse the unit, as the ultrasonic waves
will bounce back from any obstacles.
Avoid water.
It can damage the electronics
Avoid sudden changes of temperature.
The Cable Height Meter takes into
account temperature to measure the
speed of sound travelling in air. If there
are sudden temperature changes, i.e.
from a warm car in winter to cold icy
ground, leave the unit to adjust for a few
minutes.
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 a
clear/clean echo back, to calculate correct distance.
3. Make sure echo gets back into cone, as otherwise, unit will not
display reading. May need to tilt unit to get a reading if overhead
wires are sloped.
4. CHM is not waterproof, so keep unit dry as much as possible. If
wet, leave it in a warm place upside down, until dry.
5. Regular calibration a must to get best accuracy
Who uses the CHM?
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Planners
Safety Officers
Line Managers
Linesmen / Installers
Contractors
Haulage companies
Regulatory Inspectors
Warranty & Repair
• The CHM is covered by a 24 month warranty on all parts
and 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.
Suparule Cable Height Meters
• No better instrument for wire distance measurement
• Your key partner to safety
• Order NOW