Three methods in the standard: a method for determining the diffusible hydrogen content in a deposited metal by a glycerin displacement method, a gas chromatography method, and a mercury displacement method. When the diffusible hydrogen content in the deposited metal measured by the glycerin displacement method is less than 2 mL/100 g, it must be measured by gas chromatography. The standard glycerin replacement method and gas chromatography are suitable for manual arc welding, submerged arc welding and gas shielded welding. The mercury replacement method is only used for manual arc welding.
Elevator Door Operator , Center Opening Door
Machine
Permanent magnet variable frequency and voltage regulation control
Corresponding to center opening landing door device
Operating voltage AC 220V
Asynchronous door vane, synchronous belt drive
Optional mounting: mounted on straight beam or top of the car
Fully digitized closed-loop control
Center opening door machine
Elevator Door Operator
Elevator Door Operator, Lift Door Operator, Elevator Car Door Operator
Ningbo Xinda Elevator Traction Technology Co., Ltd. , https://www.nbelevator.de