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ELMED Isotest II RT, Operating Manual

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ELMED Isotest II RT Operating Manual Download Page 13

Checklist for Insulation Tests

Page 13

FAULT

Buzzer sounds continuously when the test button is pressed.

CAUSE

REMEDY

No or incorrect earthing connection

(valid only for testers with plug-in earth connection:
ISOTEST Type II T / II RT from Serial No. 14796
ISOTEST Type VT / C-VRT from Serial No. 21 000
or from October 1991

The earthing plug must be pushed
into the earthing socket up to the
stop. There must be no material
from the leather carrying case
between plug and socket.

Idle - no electrode contact with the test
specimen
Battery charge too low
ELMED Isotest testers are equipped with
exhaustive discharge protection

Replace battery or inspect old
battery and recharge.

During the test - with test electrode
in contact with the test specimen
Excessive energy flow e.g. due to
moisture

Reduce the display sensitivity at
the adjustment knob until the
continuous signal stops. The
reduction in the display sensitivity
has no effect on the level of the set
voltage!!

In other cases, a "continuous buzzer" is the signal for a detected flaw in the
test specimen!

Summary of Contents for Isotest II RT

Page 1: ...aning of the Acoustic Signals 12 2 Test Voltage 14 2 1 Checking for High Voltage at the Test Electrode 14 2 2 Is the Test Voltage Level Correctly Set 14 2 3 Is the Test Voltage Monitored with a Sphere Gap 14 3 Earthing 14 3 1 Methods of Earthing 14 4 Test Procedure 18 4 1 Is an Automatic Controller Installed in the Tester 18 4 2 Are the Test Electrodes in Order 18 4 3 Special Tests 19 C Table for ...

Page 2: ...r own safety take a few minutes to read the manual before switching on the tester for the first time Important note for wearers of a heart pacemaker For safety reasons wearers of a heart pacemaker should not operate an insulation tester and in particular should avoid contact with the test electrode the tested pipe and or the earth cables irrespective of the type of heart pacemaker or insulation te...

Page 3: ...ge cable for mechanical damage On no account may the plugs on the battery leads be short circuited in order to avoid The risk of fire and Destroying the battery Even a brief short circuit can result in the destruction of the battery and is not a suitable method for checking the state of battery charge CAUTION Should any work be necessary on the tester this should only be carried out by trained spe...

Page 4: ...tition frequency testing speeds of up to 250 mm s are possible The test high voltage is set using a sphere gap in accordance with VDE 0433 The constant adaptation of the power supply by the control electronics guaran tees a constant output voltage even under widely differing load conditions Assuming proper use of the tester see 2 2 residual charges on the test object can be neglected thanks to the...

Page 5: ... earth connection between tester and test specimen otherwise the tester will emit a continuous buzzer tone and will not function see 2 3 and Checklist point 3 Insert the test electrode into the screw fitting on the handle On tester version II RT F set the desired test voltage see 1 3 1 On tester version II T the test voltage is fixed so that setting is not necessary Turn on the tester main switch ...

Page 6: ...he rotary knob by moving lever in counter clockwise direction Setting is now carried out with the black inner part of rotary knob Ž The numeric value before the comma decimal point must appear in the window of the rotary knob the numeric value after the comma must be set with the inner ring linked to the black knob After setting lock the rotary knob again by moving lever in clockwise direction If ...

Page 7: ... knob Anzeige There are four levels for setting If after commissioning the tester and inserting the test electrode a continuous buzzer sounds reduce the display sensitivity by turning the adjustment knob in clockwise direction until the continuous buzzer stops see Checklist point 1 2 The reduction in the display sensitivity has no influence on the level of the set voltage ...

Page 8: ...attery All Type II T II RT F testers have a special electronic system which detects when the battery voltage has dropped below a preset value and indicates this by the buzzer sounding continuously when the tester is switched on The measure prevents a damaging exhaustive discharge of the battery and ensures a reliable function see Checklist point 1 2 2 3 Lack of Earth Connection This section must b...

Page 9: ...ened is metallically bare in order to ensure a reliable connection A poor of lack of earthing connection can result not only in incorrect measurements but also spark overs at the safety switch Alternative methods of earthing and possible faults are described in detail in the Checklist under point 3 1 2 4 Load Exerted by the Test Specimen The wide range of possible applications of the ELMED insulat...

Page 10: ...xpensive repairs As a reminder the date of the next inspection is marked on the test label Although thanks to their sturdy and proven design ELMED Isotest testers are rela tively unsusceptible to faults the following points should nevertheless be observed Do not expose the tester to high humidity or to wetness Clean the plugs and sockets regularly to avoid dirt Do not allow the high voltage cable ...

Page 11: ...ng continuous operation approx 3 hours During cyclic operation approx 9 hours A 1 2 Test Voltage Voltage form unipolar pulses Pulse repetition period approx 10 µs Pulse repetition frequency 25 30 Hz Current effective value approx 40 mA A 1 3 Dimensions and Weights Length 280 mm Height 235 mm Width 100 mm Length of high voltage cable 1500 mm Weight incl handle 4 5 kg Weight of the battery 1 0 kg ...

Page 12: ...nual for the battery charger 1 2 Meaning of the Acoustic Signals A brief buzzer sound when the test button is pressed indicates that the tester is ready for operation FAULT Buzzer does not sound when the test button is pressed CAUSE REMEDY Main switch on tester has not been turned on Turn main switch to ON or I No battery installed in tester Install battery Battery discharged Replace battery or in...

Page 13: ...the leather carrying case between plug and socket Idle no electrode contact with the test specimen Battery charge too low ELMED Isotest testers are equipped with exhaustive discharge protection Replace battery or inspect old battery and recharge During the test with test electrode in contact with the test specimen Excessive energy flow e g due to moisture Reduce the display sensitivity at the adju...

Page 14: ...thane tar or epoxy resin coatings observe DIN 30 667 and the manufacturer s instructions 2 3 Is the test voltage monitored with a sphere gap DIN 30 672 section 5 5 5 prescribes a sphere gap as obligatory Point gaps are particularly susceptible to changes in atmospheric pressure and humidity and can under certain circumstances result in seriously incorrect settings of the test voltage ELMED testers...

Page 15: ... which the earthing clip is fastened is metallically bare in order to ensure a reliable connection 3 1 2 Indirect earthing with the earthing rod and trailing earth With this method of earthing the test specimen is connected to the ground at an accessible and metallically bare point using the earthing rod Push the earthing rod as far into the ground as possible Connect the earthing clip to a metall...

Page 16: ...ester is earthed but not the test specimen Connect the test specimen to the ground using the earthing rod Use only ELMED earthing rod supplied Do not use home made earths Poor conductive link between the test specimen and the ground In view of the ground conditions sand extremely dry or stony soil it can be expedient to soak the point at which the earthing rod is inserted into the ground with wate...

Page 17: ...or large nut is attached to the end 3 1 3 Special forms of earthing If due to the confines of the process earthing as described in section 3 1 1 and 3 1 2 is not possible it is possible to use a capacitive earth Since in such cases conditions specific to the particular application have to be taken into consideration please contact ELMED beforehand in order to enable us to recommend a solution tail...

Page 18: ...t sag as this will result in incorrect measurements 4 2 2 Has the test brush appropriate to the pipe diameter been selected The electrode must be in contact with the pipe over the full brush surface Gaps between pipe and brush will result in incorrect measurements 4 2 3 Are the brush electrodes solid brushes Thanks to their higher stability solid brushes with continuous brush cover can ensure the ...

Page 19: ...ssary here 4 3 2 Correct Testing of Socket Pipes The insulation of the insertion end of pipes for socket connections applied at the factory mean that there is no conductive connection between the two pipes The last pipe laid can be easily earthed with the earthing cable of the tester but not the last pipe but one This is of significance particularly during the examination of the subsequent socket ...

Page 20: ...22 0 23 0 24 0 25 0 3 71 4 02 4 35 4 71 5 03 5 37 5 69 6 03 6 39 6 78 26 0 27 0 28 0 29 0 30 0 31 0 32 0 33 0 34 0 35 0 7 26 7 77 8 30 8 86 9 45 10 04 10 70 11 45 12 35 13 55 For testers with micro drive only II RT F kV S kV S kV S 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 0 36 0 41 0 46 0 52 0 57 0 62 0 78 0 93 1 12 1 32 1 53 1 75 2 00 2 25 2 52 10 0 10 5 11 0 11 5 12 0 12 5 13 ...

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