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PORTABLE MOISTURE DETECTOR

LH-20S

(RESISTANCE ALARM SYSTEM)

USER MANUAL

levr

Ver. 2.6

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Содержание LH-20S

Страница 1: ...PORTABLE MOISTURE DETECTOR LH 20S RESISTANCE ALARM SYSTEM USER MANUAL levr Ver 2 6 ...

Страница 2: ... moisture in the insulation The resistance wire of the alarm loop is also used to locate the leakage moisture 2 Representation of Measured Values The LH 20S detector is designed to measure the resistance of polyurethane insulation and the alarm loop The resistance of the loop is used to automatically calculate the length of the tested pipeline section Insulation resistance in turn is used to deter...

Страница 3: ...line displays the following information length the heating pipeline section m resistance of the alarm loop Ω The device can also display text messages The first line of the display displays text messages which inform of possible problems with the measurement of polyurethane insulation resistance Brak kontaktu No Contact poor quality of the connection between the carrier pipe and the LH 20S detecto...

Страница 4: ...lation resistance while the second line displays the calculated length of the pipeline section in meters and the measured alarm loop resistance in ohms Practical Advice Primary measurements should be performed regularly during the installation of the alarm system to ensure correctness of installation Reasons for the importance of control measurements are illustrated in fig 2 depicting three pipeli...

Страница 5: ...the MH value drops to 12 Three supposedly correct sections MH 0 of the alarm system after they are joined together barely meet the technical specifications regarding moisture levels MH 12 An inexperienced person will be misled by the results and will look for faults in the joints between the three sections 3 2 Secondary Measurements when MH 11 and when the ZWARCIE SHORT CIRCUIT or C Messages are d...

Страница 6: ...surement was made and so on Accidental shorting of the copper wire with the carrier pipe or damaged insulation in the moist location causes the wire to be no longer useful for measurements The location of the short circuit or moisture between the copper wire and the carrier pipe can only be determined with the reflectometer Note however that the heating line consists of two identical pipelines fee...

Страница 7: ...he twin dry wire MH 0 99MΩ from the second pipe Only after forming such substitute alarm loops you can attempt to locate the leakages moisture Note that the length of the alarm loop formed from two resistance wires located in separate pipes is twice as large as the length specified in the technical documentation Furthermore if the pipeline system is branched the resistance wire in one branch may b...

Страница 8: ...e that only one break exists The ends of the broken wire of the alarm loop are connected electrically by the moisture The resistance of the connection is added to the resistance of the wires and is high enough to exceed the alarm loop resistance length measurement range Simultaneous indication of moisture MH 6 and displaying of the HI message suggests that the fault is caused by external reasons t...

Страница 9: ...ndition if the measurement results are between 0 11m and 0 60Ω Measurement results depend on the length of the tested wire 0 036Ω m and on the resistance of the contacts between the magnetic connectors and the carrier pipe Practical Advice Connections for secondary measurements need to be made carefully to ensure that they do not affect measurement results Fig 6 presents a method of testing the qu...

Страница 10: ...y be extended with the copper wire In such case connect the end of the wire to the pipe In general breaks in the isolated sections of the alarm loop wire should be located with a reflectometer Capacitive measurement method may be used to locate the break in the wire only if there is no moisture in the area of the wire break result 1 Note In each of the above described secondary measurements any in...

Страница 11: ...e is displayed try rubbing the magnetic connector along the carrier pipe If this produces no results check the condition of the two black detector wires To do so connect the two wires together and start the measurement If the Brak kontaktu No Contact message appears the wires are faulty and should be repaired or replaced Often the black wires are damaged because the magnetic connector was disconne...

Страница 12: ...f the resistance measurement used in MH level determination 5 accuracy of the alarm loop resistance measurement 0 2 4 Text messages poor quality of the connection between the detector and carrier pipe Brak kontaktu No Contact electric break in the alarm loop Przerwana pętla Open Loop short circuit of the alarm wire with the carrier pipe C metallic contact between the detector wire and the carrier ...

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