『Gas Flow Meter Tester Kits: Portable Differential Pressure Gauges for Field Ventilation Audits』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
Gas Flow Meter Tester Kits for Field Ventilation Audits
Quick Answer: A portable differential pressure gauge combined with a pitot tube measures gas velocity and air flow in duct systems. Silver Automation Instruments supplies test kits for ventilation audits in process plants and commercial buildings. Send your duct size, gas type, pressure range, and temperature via WhatsApp for a quote.
We have seen many field audits delayed by bulky equipment. A good portable kit solves that problem. It fits in a small hard case and runs on battery power. The kit measures differential pressure, calculates velocity, and logs data for later review.
What the Kit Includes
The basic field kit from Silver Instruments includes three main parts. First is the SI-DP-PRO portable differential pressure gauge. Second is a pitot tube set with lengths of 300 mm, 500 mm, and 1000 mm. Third is the silicone hose pair with quick connectors. You also get a calibration report and a hard carry case.
The gauge accepts pressure from minus 5 kPa to plus 10 kPa as standard. Other ranges are available for gas flow in large stacks or small duct lines. Accuracy is 0.5 percent of full scale at 25 °C. The temperature input accepts a PT100 probe for density correction. This helps you get actual gas flow instead of standard air only.
How Field Ventilation Audits Use Differential Pressure
Field ventilation audits answer one main question. Is the duct moving the right amount of gas at the right pressure drop? You insert the pitot tube into the duct through a test port. The gauge reads velocity pressure. The gauge calculates air velocity from the pressure. Then you multiply velocity by duct cross section area to get volume flow.
The normal method is a duct traverse. Insert the pitot tube through the test port. Take readings at six or twelve points across the duct plane. The gauge averages the velocity pressure and calculates flow. This takes about ten minutes per duct line. Log the data. Move to the next test point.
In practice most engineers skip this part. They assume the fan curve is still correct. Dirt, filter loading, damper changes, and duct leaks change the actual flow. A portable kit gives you real numbers in 10 minutes per test point. That is the practical value.
We have seen this on customer sites many times. A paint manufacturer in Southeast Asia used our kit to check exhaust flow on a spray booth. The reading was 18 percent below design. The cause was a blocked filter bank, not the fan. They replaced the filters and airflow returned to specification. This kind of check prevents product quality problems and unsafe solvent buildup.
Matching the Right Range and Accuracy
Select the differential pressure range based on your duct velocity and gas density. For most HVAC audits 0 to 2000 Pa is enough. For industrial exhaust or gas lines, use the minus 5 kPa to plus 10 kPa range. The SI-DP-PRO displays in Pa, kPa, mbar, mmH2O, and inH2O. You can switch units in the field without a laptop.
For fixed installations we also supply the SI-3151DP differential pressure
Temperature matters more than people expect. A hot exhaust stack at 120 °C has lower gas density than room air. Without temperature correction the flow error can be 10 percent or more. Use the PT100 input on the gauge and enter the duct area. The meter stores the readings with time stamps. It logs 50000 data points. You can export them over USB.
What to Send for a Quote
Tell us your gas type, temperature range, duct diameter or cross section, and expected pressure range. Also confirm if you need ATEX Zone 1 or Zone 2 approval for the audit area. For biogas, landfill gas, or solvent vapors we can check the wetted materials and certification. Send this via WhatsApp at +86-25-52155837 or call +86-25-68650347. Our engineers reply with a model selection and price.
Most orders ship within 5 working days. We can include an English calibration certificate and a quick start guide. For customers in Vietnam, Thailand, Indonesia, and the UAE we ship by DHL or FedEx. We also support local dealer pricing if you resell portable test kits in your region.
FAQ on Portable Differential Pressure Test Kits
Can one kit measure gas flow in both round and rectangular ducts?
Yes. You measure the duct cross section and enter that value in the gauge. For rectangular ducts measure width and height. For round ducts use the internal diameter. The gauge calculates volume flow from velocity and area.
Do I need temperature correction for air duct audits?
For room temperature or ambient air it is optional. For hot air, flue gas, or process gas use the PT100 input. It improves total flow accuracy. The gauge can calculate actual gas density when you enter the gas type.
What pressure range fits a cleanroom ventilation audit?
Cleanroom audits often need 0 to 1000 Pa or 0 to 2000 Pa. The minus 5 kPa to plus 10 kPa range also works but has lower resolution at very low pressure. Tell us the typical air velocity if you are not sure. We will suggest the right sensor range.
Can the kit be used for gas flow in pipes with pressure above atmospheric pressure?
Yes, if the static pressure is within the gauge limit. The standard model works up to 100 kPa static pressure. For higher static pressures ask for the high pressure version. Provide the line pressure and gas type during the quote.
Does Silver Instruments provide repair and calibration services?
Yes. We calibrate the gauge against a reference standard and issue a certificate. The recommended calibration interval is 12 months. You can ship the device to our Nanjing service center or use a local partner.
For pricing and delivery time, send your duct size, gas type, pressure range, and temperature. WhatsApp us at +86-25-52155837. You can also call +86-25-68650347 or add WeChat +86 15365082610. Ask for the gas flow meter tester kit and the SI-DP-PRO data sheet.
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