Section 7: SPECIFICATION
7.10 Specification Table
Altitude
2000m
Max. relative humidity of 80% for temperatures up to 31C decreasing linearly to 50% at 40C
Supply Voltage
+/-10%
Pollution Degree
2
Installation Category II
Models 202503 and 202703 conform to ATEX II 3G T4
[ATEX Group II (Explosive Atmosheres), Category 3G (Gases), Temperature T4 (135 C)]
20
Welch
2025
2026
2027
2028
Model
(Analog)
(Analog)
(Digital)
(Digital)
Free Air Displacement
CFM (L/min) @ 60 Hz
1.2 (34)
1.1 (32)
1.1 (32)
1.2 (35)
m3/hr (L/min) @ 60 Hz
1.7 (28)
1.6 (27)
1.6 (27)
1.8 (29)
Vacuum Level, in Hg
29.6
29.85
29.85
29.85
Ultimate Pressure, Torr (mbar)
9 (12)
2 (2.7)
2 (2.7)
2 (2.7)
Motor Horsepower (watts)
1/5 (150)
1/5 (150)
1/5 (150)
1/5 (150)
Bump/Anti-Foam Button
N/A
N/A
N/A
YES
Tubing needed, I.D. in (mm)
1/4" (7)
1/4" (7)
1/4" (7)
1/4" (7)
Intake / Exhaust Thread NPT
3/8
3/8
3/8
3/8
Weight, lbs (Kg)
30 (13.6)
30 (13.6)
30 (13.6)
30 (13.6)
Programmable
Repeat Function
N/A
N/A
N/A
YES
Store Programs
N/A
N/A
N/A
up to 5
Timer
N/A
N/A
N/A
1-999 min.
Overall Dimensions
L in. (cm)
13.6 (42.2)
13.6 (42.2)
13.6 (42.2)
13.6 (42.2)
W in. (cm)
12 (30.5)
12 (30.5)
12 (30.5)
12 (30.5)
H in. (cm)
11.3 (28.7)
11.3 (28.7)
11.3 (28.7)
11.3 (28.7)
Shipping Weight, lbs (kg)
36 (16.3)
36 (16.3)
36 (16.3)
36 (16.3)
Catalog Number
Wired for 115V, 60Hz, 1 Ph
202501
202601
202701
202801
with N. American 115V Plug
Catalog Number
Wired for 230V, 50Hz, 1 Ph
202503
n/a
202703
202803
with Cont. Euro (Schuko) Plug
Catalog Number
Wired for 100V, 50/60Hz, 1 Ph
202505
n/a
202705
202805
with N. American 115V Plug
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