Ulvac G-20DA - 2 General Description of the Pump; Principal Features

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2.General Description of the Pump
2.1 Principal Features
This oil rotary vacuum pump is a sliding vane type (so called Gaede type), with direct driven
motor. As it is a small sized, lightweight, and simple structure, it is easy to maintain or
over-haul.
Table-1 Specification
Model
G-20DA G-25SA G-50DA G-50SA
Type
Sliding vane
2 stages
Sliding vane
1 stages
Sliding vane
2 stages
Sliding vane
1 stages
50Hz 20 20 50 50
Pumping speed
L/min
60Hz 24 24 60 60
Ultimate pressure Pa 1.3×10
-1
9.3 1.3×10
-1
9.3
Motor W,（Poles） 100（4） 200（4）
50Hz 3.7 5.6
Full load current
A
60Hz 3.0 4.8
50Hz 1,450 1,440
Motor revolution
ｒ/min
60Hz 1,740 1,730
Recommended SMR-100
Pump oil
Capacity, (mL) 180 230 260 360
Note 1. Ultimate pressure indication by McLeod gauge.
For G-20DA,50DA : 1 order higher pressure indication by Pirani gauge.
For G-25SA,50SA : same pressure indication by Pirani gauge.
2. Vapor pressure, viscosity, or characteristics of vacuum pump oils are different
respectively. Our recommended oil is SMR-100.