Key Features

• Measures gas flow rate in SCFM, NM3/hr, Lbs/hr, Kg/hr, & many more
• Wide measurement range; 100 to 1 turndown typical• Measures process gas temperature
• 4 to 20 mA for flow rate & temperature• Welded, 316 SS sensor construction; Hastelloy C276 optional
• Microprocessor based, field programmable electronics• NIST traceable calibration
• Low-end sensitivity for leak detection• Negligible pressure drop• No moving parts design
• FM (U.S.) & FMc (CANADIAN) approved for Class I, II, III, Division 2, Groups A, B, C, D, E, F, G T4A hazardous locations. NEMA 4X and CE approved.

Gas Gauge Vent Flowmeter

Gas leakage in a reciprocating compressor has a significant economic and environmental cost.  Windrock now has a convenient, highly accurate, affordable way to measure the leakage thru the vent lines.  Our Model 3200 Gas Gauge Flowmeter is available in both an online and portable version. It measures two important process variables in one rugged instrument, gas flow rate and temperature. The Model 3200 measures gas flow rate in standard units without the need for temperature or pressure compensation. It provides isolated 4 to 20 mA and pulse outputs for flow rate, and a 4 to 20 mA output for process gas temperature.

A Windrock supplied compression fitting secures the probe in place. The inline model is available in ¼-inch to 6-inch sizes and includes built in flow conditioners that eliminate the need for long, straight pipe runs. The meter can be ordered with flange or NPT end connections. Both models are supplied with 316 stainless steel wetted materials standard or Hastelloy C-276 as an option.

Theory of Operation

Windrock Flowmeters use a Constant Temperature Differential (ΔT) technology. The sensor has two elements. The Reference RTD measures the gas temperature. The electronics heats the Heated Element above the gas temperature. It is the job of the electronics to maintain a constant ΔT between the gas temperature and the Heated Element. As mass flow increases, the increased numbers of gas molecules remove more heat from the Heated Element.

The electronics senses this temperature reduction and adds additional power to the heated element in order to maintain a constant ΔT. The amount of power delivered to the Heated Element is proportional to the mass flow rate. The microprocessor then linearizes this signal to deliver a linear output.

Introducing Gas Gauge Portable Vent Flowmeter

The new Gas Gauge portable vent flow meter from Windrock gives you a highly accurate, easy to use way to quantify packing vent leakage. It has a measurement range of 0.06 - 6.0 SCFM, accuracy of 1% +/-0.2% full scale, and is calibrated to measure multiple gases.

Armed with accurate information about packing vent leakage, you’ll be able to understand how well your current compressor seals are performing and evaluate the effectiveness of alternative solutions:

• Accurately assess leakage associated with pressure packing and unloaders
• Develop a family of leak curves that compare the performance of different packing styles
• Quantify the difference in performance between standard packing and low leakage engineered packing
• Calculate economic and environmental justification for installing sealing component upgrades

Specifications

Performance Specs

Flow Accuracy: ± 1% of reading ± 0.2 % of full scale*

* Point velocity for insertion flowmeters. Windrock recommends a minimum of 15 diameters of straight pipe upstream of the flowmeter and 10 diameters downstream for insertion flowmeters. Windrock recommends a minimum of 8 diameters of straight pipe upstream of the flowmeter and 4 diameters downstream for inline flowmeters.

Flow Repeatability: ± 0.2% of full scale

Flow Response Time: 0.9 seconds (one time constant)

Temperature Accuracy: ± 1.8° F (± 1.0° C) over -40 to 250° F (-40 to 121° C); ± 3.6° F (± 2.0° C) over 250 to 650° F (121 to 343° C). Minimum velocity 60 SFPM.

Physical Specs

Sensor material: 316 stainless steel standard; Hastelloy C276 optional

Enclosure: FM (U.S.) & FMc (CANADIAN) approved for Class I, II, III, Division 2, Groups A, B, C, D, E, F, G, T4A hazardous locations. NEMA 4X and CE approved.

Operating Specs

Units of Measurement: SCFM, SCFH, NM3/hr, NM3/min, Kg/hr, Kg/min, Kg/sec, Lbs/d, Lbs/hr, Lbs/min, Lbs/sec, NLPH, NLPM, SLPM, SMPS, NMPS, SFPM, MMSCFD, MMSCFM, SM3/hr

Flow Rates for Insertion Flowmeter: 0 to 32,000 SFPM (163 NMPS) - Air at 70F & 1 ATM

To determine if an Insertion Flowmeter will operate properly, divide the maximum flow rate by the pipe area. The application is acceptable if the velocity is within the velocity range above.

Here are flow rates for common pipe sizes:

Gas Pressure (maximum):

• Insertion Flowmeter: 500 psig (34.5 barg)
• In-Line (1/4" through 6"): NPT 500 psig (34.5 barg), 150# flange 230 psig (16 barg)

Note: Pressure ratings stated for temperature of 100°F (38°C).

Temperature:

• Std sensor: -40 to 250°F (-40 to 121°C)
• Enclosure: -40 to 158°F (-40 to 70°C) without display, 32 to 140°F,(0 to 60°C) with display.

Input Power: 24 VDC, ± 10%, 0.75 amp

Output: Two isolated 4 to 20 mA outputs (1 for flow & 1 for temperature);

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Gas Mass Flowmeter &
Temperature Transmitter