Page 23 of 26
8.
WARRANTY & SERVICE
8.1 Product Warranty
a. Our products are guaranteed within 1 years warranty against defects in materials and workmanship if used in
accordance with specifications and not subject to physical damage, contamination, alteration or retrofit.
b.
Buyers undertake to check and inspect the goods and to notify SevenStar of shipment incidents by fax, phone
or e-mail as soon as possible after receipting the goods.
c.
During the warranty period, products must only be repaired by Sevenstar or authorized SevenStar service
centers; otherwise, the SevenStar product warranty will be invalidated.
d.
Repairs will be performed free of charge during the one-year warranty period. If MFCs/MFMs are out of
warranty, SevenStar will notify the owner of replacement or repair costs before proceeding. Factory service and
repairs are guaranteed 90 days. The warranty excludes consumable materials and wear parts (in teflon, viton,
etc.).
e.
No MFC/MFM used with dangerous gas will be accepted for repair or warranty without a decontamination and
purge certificate.
8.2
Specific warranty requirements are as follows :
a.
Gas must be clean and particle-free, which means a filter( <30μ) must be fitted in the gas line upstream of the
MFC/MFM.
b.
Gas must comply with the pressure specifications, and never exceed the rated value.
c.
Process gas should be in line with the seal materials chosen in the order, especially in case of corrosive gas. We
shall not be responsible for any damage caused by changing process gas or choosing the wrong seal materials
in order.
d.
Electrical connection requirements are as follows: The system must be wired carefully: non-observance of the
pin out may irreversibly damage the electronic board inside the products. If user self scheme power supply of
MFCs, a stable and anti-jamming power supply is required, with ripple below 5mV.
e.
Gas connections: the fittings must be handled carefully. We guarantee that all fittings have been individually
inspected and are scratch-free.
f.
The MFC/MFM must not be dismounted: the MFC/MFM warranty will be invalidated if the seal between the
MFC/MFM block and cover is torn.
8.3
Service
Our product engineer will help you with issues related to operation, calibration, installation, process specification,
gas convention, etc. And we also provide you with technology support& maintenances, and products operation
training.
Please visit
www.mfcsevenstar.cn
for relevant information and the locations of our service centers.
