'Function and use'
1, Function:
SL-AY508V 'frequency conversion frequency method' buried pipeline insulation resistance tester can not dig the casing, convenient and accurate measurement of buried metal pipe coating insulation resistance, in order to truly reflect the buried pipeline coating quality situation.
2, Uses:
(I) accurately measure the insulation resistance of the pipeline coating, can be used to determine the integrity of the pipeline coating or damage to determine the replacement, repair or overhaul of the exact pipe;
(Ii) measuring the insulation resistance of the pipeline coating, can be used to guide the strengthening of cathodic protection measures;
(Iii) for cathodic protection design, can improve the design accuracy;
(Iv) For new construction of the pipeline, to ensure construction quality.

'Features'
◆ Measurement method is simple and fast
◆ measurement results are true, clear, good reproducibility
◆ frequency selection frequency method for different diameter, different steel, different anti-corrosion insulation materials, different coating structure of the buried pipeline.
◆ can be measured in a continuous pipeline of any length of pipe, pipe from the pipeline outside the pipe coating quality is good or bad, without the impact of pressure lines are not affected by whether the branch.
◆ Not affected by AC interference
◆ Do not dig pipe, does not affect the normal work of the pipeline, you can not shut down the cathode protection.

'Main Specifications'
3.1 Signal source part
3.1.1 Output frequency range: 0.3kHz ~ 300kHz, the output level range: -40dB ~ +10 dB
3.1.2 frequency resolution: 1Hz, frequency stability: ± 3 × 10 ˉ 6,
3.1.3 Output level error: ± 0.2dB, each step of 10dB, continuous adjustment of 10dB
3.1.4 Output impedance: 0Ω ± 10%, Power supply: DC 7.6V, Ambient temperature: -10 ℃ ~ + 40 ℃
3.1.5 Overall dimensions: 185 × 100 × 50 mm, weight: about 0.7 kg
3.2. Receiver section
3.2.1 Measuring frequency range: 0.3kHz ~ 300kHz, the measurement level range: +40 dB ~ -110dB,

Error: ± 0.2dB
3.2.2 Measurement level Input impedance: ≥ 10kΩ
3.2.3 Ambient temperature: - 10 ℃ ~ +40 ℃, Power: DC rechargeable battery 7.6V
3.2.4 Overall dimensions: 185 × 100 × 50 mm, weight: about 0.8 kg

'Detection principle and method'
By applying an electrical signal to the underground metal anticorrosive pipeline, the transmission of the electrical signal is measured and the insulation resistance of the pipeline coating is determined by the attenuation of the signal transmission.