ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 120

PITOT TUBE AIR FLOW METERS
Specifications:
Maximum Air 250 °F (standard)
Temperature: 300 °F (high temp version)
Max. Operating 15 psig (standard unit)
Pressure 35 psig (medium pressure unit)
80 psig (high pressure unit)
Repeatability: 1% of scale at calibration point
The following table provides recommended flow rates for each meter at a given operating pressure range. These values are suitable for temperatures
between 70-100 deg F. For meter applications outside this temperature range and outside of the operating pressure ranges listed below please contact
our sales department for help in choosing a suitable meter.
Operating pressure
PFLOW 1"
PFLOW 1-1/2"
PFLOW 2"
PFLOW 3"
PFLOW 4"
PFLOW 6"
PFLOW 8"
Calibration and Correction Factors:
Each PFLOW pitot tube is calibrated for a specific operating temperature and pressure. If the pitot tube operates at
a different pressure or temperature than the original design, the flow measurement can be adjusted with the
following equation: (Units of Flow
Flow = Flow x (P /P
1 2 2
Pressure units: psia, Temperature units: °F
Options Table:
Option Description
Orientation: The flow meter gauge can be oriented for flows from Left to Right, Right to Left, Up or Down as required for your specific application.
Site Specific The following information is required to calibrate the flow meter for your specific application:
Calibration and Operating Pressure (psia):
Gauge Range: Operating Temperature (°F or °C):
Operating Flow Rate (acfm or scfm or other scales as required):
Maximum Flow rate (better accuracy is achieved when the operating flow rate is approximately ¾ of the scale range of the flow meter)
4-20ma Option Flow meters can be ordered with 4-20ma outputs for control systems. Three versions are available:
Nema 7 (Class 1 Div 1)
FM or CSA approved
Two Wire Connection: 24VDC+, Signal Output
Power Consumption: 20mA
316SS Wetted parts
Nema 4 (Weatherproof) or Nema 1 (General Purpose)
Three Wire Connection: 24VDC+, 24VDC-, Signal Output
Accuracy on all 4-20ma outputs: 2.5% of full scale for meter
Aluminum with Silicon diaphragm
Shutoff Valves The pressure gauges are not designed to operate with water collecting within the internal components. If you will be operating with hot
wet air or condensing air streams, then it is recommended that we install shutoff valves in the pressure communication lines to isolate
the gauge from the process lines when the operator is not taking a flow reading.
Pre Installed The flow meters can be preinstalled in a section of pipe with any configuration of material and fittings on the end. This will allow the
Section of Pipe PFLOW meter to be factory installed and tested in this section of pipe before leaving our facility.
Pipe Mounting A pipe-mounting bracket can be supplied to allow the gauge to mount directly on the pipe as shown in the above picture.
Bracket
PFLOW SERIES
0-5 psi 5-10 psi
15-40 17-50
35-90 40-115
60-160 70-200
135-360 150-450
250-650 275-800
550-1500 600-1800
1000-2500 1100-3200
and Flow will be the same)
1 2
1/2
x ((T +460) / (T +460))
1 1 2
Accuracy: 2.5 % of scale at
calibration point
Pressure Drop: Less than 2" WC
pressure drop in high
flow applications
Recommended Operating Flow rates (SCFM)
0-10" Hg
12-35
25-75
50-150
100-300
200-550
450-1200
750-2250
10-20" Hg 20-26" Hg
8-25 6-20
20-60 15-50
30-100 25-80
75-250 50-180
120-450 100-320
275-1000 200-750
500-1750 350-1250
E-1255