2Suparule 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
3Why was the CHM developed? Low wires are a public safety problemMany reported accidents with both electrical and telecom wiresExisting measuring methods were not considered safe enough for operators
4Competitive 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
5Ultrasound Measurement From the cone of instrument, the transducer sends out a burst of soundThe 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 takenCalculates distance, based on speed of sound. Adjusts for air temperature.The microcontroller calculates the distance in either imperial or metricInstrument Time Echoes from wires
6How to use of Cable Height Meter CHM Operation 1. Select: M (metric) or I (imperial) at the back2. Set the CAL mode switch to the WIREposition.3. Press the ON key to power4. 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).
7Cable 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.DateReadings
8Range Specification of the CHM 190-300-600 measures up to 15m (50ft)
9Range Specification of the CHM 300E-600E measures up to 23m (75Ft)
11Just simply stand under the O/H line, center yourself under the conductors and press the button.
12Reading #1 gives the height to the lowest conductor
13Reading #2 gives the distance between 1st and 2nd wire
14Reading #3 gives the distance between 2nd and 3rd wire
15Reading #4 gives the distance between 3rd and 4th wire
16The memory stores the measurements so that you can scroll through them in order to record them on paper etc.
17By pressing button once, readings of up to 6 conductors are taken provided the wires are all within the ultrasonic beam
18CHM & Ultrasonic beamPush 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 perpendicularto overhead wire, as otherwisereflection will not be receivedin cone.
19CHM 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 5.025mThe 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 m and 5.035m.Accuracy is met when CHM is regularly calibrated. Best practice require a 12 month calibration.
20CHM Battery Battery Life 50,000 measurements Battery used: 9V, PP3, non-rechargeable, Alkaline, Long-life (>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.
21Do & Don’t with CHM Do’s: Don’ts: · 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.
22Suparule Cable Height Meters : Get the most out of CHMs Let temperature settle, otherwise incorrect reading is displayed.Press measure button until reading is stable. Unit needs to get a clear/clean echo back, to calculate correct distance.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.CHM is not waterproof, so keep unit dry as much as possible. If wet, leave it in a warm place upside down, until dry.Regular calibration a must to get best accuracy
23Who uses the CHM? Planners Safety Officers Line Managers Linesmen / InstallersContractorsHaulage companiesRegulatory Inspectors
24Warranty & RepairThe CHM is covered by a 24 month warranty on all parts and labourAny defective instrument will be replaced free of charge during this periodDamaged or broken instruments will be repaired and charged at costEach instrument is pre-set, and calibrated at SuparuleService contract available, please contact your distributor/suparule.
25Suparule Cable Height Meters No better instrument for wire distance measurementYour key partner to safetyOrder NOW