Thermo Scientific 1300 Series, User Manual

Page: 60 / 130

Method:
1. Lower the front window to a height of 75 mm.
2. Operate the system blowers for approximately 20 minutes.
3. Insert the thermal anemometer probe into the probe holder. Place the
probe holder at the window opening work surface, ensuring it is seated
properly. See Figure 8-1. Adjust the probe so the air passing through
probe is centered in the window opening (37.5 mm).
4. Beginning 150 mm in from the
left inside wall, record
successive readings every
150 mm (7 readings for 1.2 m
models and 11 readings for
1.8 m models).
5. Average those readings and
calculate the inflow velocity
(V1) as described below.
Calculation:
• Inflow velocity (V1) = average of
actual inflow velocity * factor *
0.3
Acceptance:
• 0.5 m/s, ±0.025 m/s
Note The thermoanemometer
probe must be positioned at a 10°
angle from front vertical and
located on the same plane as the
inside of the window glass.
Multiply the K factor (0.9929 for
1.2 m, 0.9918 for 1.8 m) by the
average velocity reading (V1).
Refer to the data plate on the lower
right corner of the unit face.
s
1300 Series A2 8-7 Thermo Scientific
Section 8
Certification Testing
Testing Information
(continued)
Figure 8-1. Constricted Window Method