Table of Contents

Product Overview

HF-LT-303 Post Insulator Ultrasonic Flaw Detector is specially designed to detect internal defects of post insulators based on ultrasonic testing principle. It transmits ultrasonic pulses into post insulators. When ultrasonic waves encounter internal defects such as cracks, inclusions and pores, reflection, refraction and scattering will occur. The flaw detector receives reflected waves and judges the position, size and property of defects according to travel time, amplitude and other waveform features.

It is widely used in power industry for high-voltage ceramic post insulators inside and outside power plants, substations, switching stations and series compensation stations. It also performs ultrasonic inspection on porcelain shells of circuit breakers, CT, PT (including CVT), arresters with outer diameter ≤150 mm to detect internal cracks, pores, inclusions, delamination, burning defects and prevent catastrophic failures, ensuring safe, reliable and economical operation of power grids.

Features

Housing Structure

All-aluminum metal housing, sturdy and durable with excellent electromagnetic shielding performance
360° rotary damping bracket and rubber handgrip for comfortable and convenient operation
Tempered glass panel featuring high hardness, wear resistance and scratch resistance

Display Interface

Full Chinese menu, main/sub menu and guided operation; assisted by shortcut keys and rotary encoder for easy control
Full digital true-color LCD display with resolution 640×480 for delicate waveform presentation
4 optional operation interface styles; adjustable LCD brightness

Screen Capture & Flaw Inspection Report

Real-time screen capture for all pages; images saved as BMP files to USB flash drive (color or grayscale optional)
Export inspection reports to PDF files for archiving and printing; PDF contents customizable as required
BMP pictures and PDF files can be viewed on computers and mobile phones in real time

Detection Range

Zero-incident testing range: 0~15000 mm (steel medium, longitudinal wave), continuously adjustable

Transmitting Pulse

Pulse amplitude: optional 100V, 200V, 250V, 300V, 350V, 400V, 450V, 500V, wide applicable testing range
Pulse width: continuously adjustable within 0.05~10 μs to match probes of different frequencies
Probe impedance: 50Ω, 150Ω, 250Ω, 500Ω optional
Working modes: single crystal straight probe, single crystal angle probe, dual crystal straight probe, dual crystal angle probe, through transmission inspection

Amplification & Receiving

Hardware real-time sampling: high-resolution 16-bit AD, sampling speed 320MHz, highly restored waveform
Detection mode: positive half-wave, negative half-wave, full wave, RF detection
Filter bandwidth: 0.2~20 MHz, automatically matched with probe frequency without manual setting
Gate reading: single gate or double gate reading, peak value reading inside gate optional
Gain: total gain up to 110dB; step options: 0, 0.1dB, 1dB, 2dB, 6dB. Unique auto gain and scan gain functions for fast and accurate inspection

Gate Alarm

Gate A and Gate B share identical functions; gate position, gate width and gate height adjustable.
Selectable wave-in alarm or wave-loss alarm with LED indicator light.

Data Storage

Built-in large-capacity storage; data will not be lost after power-off.
Supports 500 groups of inspection parameter channels and 1000 inspection reports.
Users can preset matching parameters for various probes and set industrial inspection standards freely.
Inspection data can be exported via USB port or USB flash drive.

Video Recording Function

The instrument records inspection processes as video files playable on the device or dedicated software.
Max. 10 local video files, each up to 5 minutes. Unlimited quantity and duration when saving to USB flash drive.
Playback supports pause, fast forward, rewind and stop functions for training and post-analysis.

Comprehensive Inspection Functions

Built-in common industry inspection standards for direct quick access
Auto calibration: probe zero point & K value auto calibration; sound velocity auto measurement; peak memory for maximum defect echo
Defect positioning: real-time display of horizontal depth and sound path position
Defect quantification: real-time display of defect equivalent dB value or equivalent size
Defect characterization: judge defects manually via echo envelope waveform
Curved surface correction: display circumferential position of defects for curved workpieces
DAC/AVG: auto curve generation, unlimited sampling points, support compensation and correction; auto floating gain, auto extension with sound path
AWS D1.1 standard: provides dynamic reflector defect grading for AWS weld inspection
Crack height measurement: automatically calculate crack height using tip diffraction echo
Gate zoom: magnify echo details for waveform analysis
Continuous recording: real-time waveform storage and playback
Waveform freeze: freeze screen waveform for defect analysis
Echo coding: display echo zones 1~9 with different colors for defect positioning
Peak marking: capture and mark peak values in real time
B-scan: real-time cross-section scanning, visualize workpiece defect morphology

Real-time Clock

Track and record inspection date and time, support data storage.

Communication Interface

USB2.0 high-speed transmission; support USB flash drive mode and data connection mode.
Back up data to PC, upload and download data via dedicated software.

Battery Module

High-capacity lithium battery module supports continuous operation over 12 hours.

Waveform Display

Adjustable gate waveform color, waveform filling and peak marking.

Repetition Frequency

Max. repetition frequency up to 2000Hz, higher frequency optional upon request.

Program Upgrade

Complete upgrade within two steps; users can upgrade firmware independently without black screen or equipment damage.

Technical Specifications

Item	Parameter
Detection Range	0 ~ 15000 mm
Operating Frequency	0.2 ~ 20 MHz
Sound Velocity Range	100 ~ 20000 m/s
Repetition Frequency	20 ~ 2000 Hz
Dynamic Range	≥36 dB
Vertical Linearity Error	≤1.5%
Horizontal Linearity Error	≤0.1%
Resolution	>42dB (5P14)
Sensitivity Margin	>65dB (Φ2 flat-bottom hole at depth 200mm)
Digital Suppression	0~80%, no impact on linearity and gain
Electrical Noise Level	≤10%
Supported Probes	Straight probe, angle probe, dual crystal probe, through transmission probe
Alarm Mode	Buzzer alarm & LED light alarm
Power Supply	DC 9V lithium battery; continuous working ≥12h
Overall Dimension	263×170×61 mm
Main Unit Weight	1.92 kg
Ambient Temperature	-10 ~ 50 ℃
Relative Humidity	20 ~ 95% RH

FAQ for Post Insulator Ultrasonic Flaw Detector

Q1: What is the core application of this post insulator tester?

A1: It adopts ultrasonic principle to detect internal hidden defects of ceramic post insulators, circuit breakers, CT, PT, lightning arresters and other porcelain equipment, such as cracks, pores, inclusions and delamination.

Q2: What maximum detection thickness can the instrument achieve?

A2: The zero-incident detection range reaches 0~15000 mm, which can satisfy the inspection requirements of most power porcelain components.

Q3: Can it be used for outdoor field inspection in substations?

A3: Yes. Portable all-aluminum housing, built-in lithium battery supporting more than 12 hours continuous work, suitable for on-site patrol inspection.

Q4: What types of probes are compatible with the tester?

A4: It supports straight probe, angle probe, dual crystal probe and through transmission probe. Multiple probe impedance options are available.

Q5: Can I save test data and export formal inspection reports?

A5: Definitely. It supports real-time screen capture, waveform storage, video recording. Test reports can be exported as PDF and pictures via USB flash drive for archiving and printing.

Q6: Does the device support B-scan display? What is its advantage?

A6: Yes. B-scan function realizes cross-section scanning, visually showing the shape and distribution of internal defects, making judgment more intuitive.

Q7: Is auto calibration available during testing?

A7: It supports automatic calibration of probe zero point, K value and sound velocity. It can automatically record peak echo for defect quantification.

Q8: What is the maximum repetition frequency of transmitting pulse?

A8: The maximum repetition frequency can reach 2000 Hz; higher frequency can be customized according to customer demands.

Q9: Can users upgrade the firmware by themselves?

A9: Yes. Only two simple steps are needed for program upgrade. Independent upgrade will not cause black screen or equipment damage.

Q10: What are the applicable ambient conditions for operation?

A10: Working temperature: -10℃ ~ 50℃; relative humidity: 20%~95%RH, adapting to various complex outdoor substation environments.

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