11
Reassembling the pump.
1. Place the head assembly on the housing, observing the
position of the air intake and exhaust ports.
Note: Make sure the diaphragm is seated properly
in the well of the housing and head. Do not pinch the
diaphragm or liner.
2. Insert the head screws and tighten each screw until it
is snug in a criss cross pattern. Do not completely tighten
the screws yet.
3. Using a torque wrench with the T-25 Hex attachment,
tighten each head screw to 45 inch-pounds, in a criss
cross pattern.
Caution: To avoid property damage or personal injury, always
try rotating the fan by HAND, prior to connecting the unit to the
power source. Check for suction at the air inlet port by placing your
fi nger over the port as you turn the fan. You should feel a slight
suction with each rotation of the fan. If you don’t feel suction, or if
you feel or hear a thump as you turn the fan, DO NOT CONNECT
THE UNIT TO A POWER SOURCE; review the assembly
procedure for possible error.
Section 6: SPECIFICATIONS
6.10 Specifi cation
Welch Model
2019B-01
2019C-02
Free air Displacement
CFM (L/min) @ 60Hz
CFM (L/min) @ 50Hz
1.3 (36)
1.1 (30)
1.3 (36)
1.1 (30)
Maximum Vacuum InHg
24
24
Ultimate Pressure Torr (mbar)
150 (200)
150 (200)
Maximum Continuous Pressure
PSIG
18
18
Tubing needed, I.D., inches
1/4
1/4
Weight, Ibs (kg)
10.2 (4.6)
11.2 (5.1)
Cord
North American 115V Plug
European Schuko Plug
Motor H.P.
1/15
1/15
Motor Voltage & Frequency
115V, 60Hz, 1 Phase
230V, 50Hz, 1 Phase
Motor Amps
3.5
1.7
Overall Pump Dimensions
L x W x H inches (cm)
8.75 x 5.0 x 8.75
(22.2 x 12.7 x 22.2)
10.4 x 5.0 x 8.75
(26.4 x 12.7 x 22.2)
Carton Dimensions
L x W x H inches (cm)
15.31 x 12.31 x 12.69
(38.9 x 31.3 x 32.2)
15.31 x 12.31 x 12.69
(38.9 x 31.3 x 32.2)
Shipping Weight, pounds (kg)
12.4 (5.6)
13.4 (6.1)
