Differential Pressure Testing; Static Pressure Testing - TSI Instruments VelociCalc 9555 Quick Tips

2. Differential Pressure Testing

a. Connect the two lengths of neoprene tubing to the positive and
negative ports at the top of the instrument
b. Place the free end of the positive port tubing in the area being
tested
c. Place the free end of the negative port tubing in the control/ambient zone
1. A positive reading means the variable/sample (+) zone is higher pressure than the
control/ambient (-)
2. A negative reading means the control/ambient zone (-) is higher pressure than the
variable/sample (+) zone

3. Static Pressure Testing

a. Connect one length of neoprene tubing to the positive port at the top of the instrument
b. Keep the negative (-) port open to measure ambient conditions
c. Attach the static pressure tip to the tubing on the positive (+) port
d. Point the static pressure tip directly into airflow to get an accurate reading
1. Positive reading means the pressure in the duct is higher than the measured ambient
conditions
2. Negative reading means the pressure in the duct is lower than the measured ambient
conditions
For complete documentation, see
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