Model: NL-QH-1

The problem

Whether a plastic housing, switch base or connector insulator tracks under damp and contaminated conditions decides if the appliance passes safety assessment. CTI is a hard number for material selection and certification filing, yet many factories have no such tester and must send samples out - weeks of queueing, and a formulation change means queueing again.

Capability

Designed to GB/T 4207-2012 and IEC 60112: test voltage adjustable from 100 to 600V (48-60Hz); at a short-circuit current of 1.0+/-0.1A the voltage drop stays within 10%; when the short-circuit leakage current reaches or exceeds 0.5A and persists for 2 seconds, a relay trips, cuts the current and declares the specimen failed - the criterion is current, not an operator judgement. Repeatability details are controlled: rectangular platinum electrodes apply 1.0+/-0.05N to the specimen, electrode size 2x5mm to standard; droplet height adjustable 30-40mm, droplet volume 44-50 drops/cm3, interval 30+/-1s with 0.1% ammonium chloride solution and accurate drop counting. The chamber has at least 0.5m3 internal volume, 1.2mm 304 stainless steel construction and a glass observation door so the whole tracking path stays visible. Structural parts and electrode tips resist high temperature and corrosion; the unit runs on AC220V 50Hz. Both comparative tracking index (CTI) and proof tracking index (PTI) can be determined.

Key specifications

• Application: tracking resistance of solid insulating materials, CTI and PTI
• Test voltage: AC 100-600V adjustable, 48-60Hz
• Short-circuit current: 1.0+/-0.1A, voltage drop <=10%
• Failure criterion: leakage current >=0.5A for 2s, relay cuts off and marks fail
• Electrodes: rectangular platinum, 2x5mm, force 1.0+/-0.05N
• Droplet height: 30-40mm adjustable
• Droplet volume: 44-50 drops/cm3; interval 30+/-1s
• Electrolyte: 0.1% ammonium chloride solution
• Chamber: >=0.5m3, 1.2mm 304 stainless steel, glass observation door
• Supply: AC220V 50Hz

Applications

Material certification for appliance and electrical accessory plastics; switch, socket and connector insulator selection; CTI grading by insulation material suppliers; safety laboratories and CCC/CQC certification support

About the manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd provides non-standard customization, drawing confirmation, factory acceptance, on-site installation and commissioning, operation training and long-term technical service; 12-month warranty and long-term spare parts supply. Tel: 0760-88500902 / 13416787649. Web: en.zsnaili.com.