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Eldridge Flow Meter Catalog: Premium Thermal Mass Gas Flow Transmitters for Gas Lines
Quick Answer: The Eldridge Flow Meter Catalog: Premium Thermal Mass Gas Flow Transmitters series covers insertion and inline devices for direct gas mass flow. Silver Automation Instruments supplies comparable insertion and inline thermal mass flow transmitters. Send your gas type, pressure (bar), temperature (°C), pipe size (DN), and flow range for a quote.
What the Eldridge Flow Meter Catalog Covers
We see many requests from water, chemical, and oil field contractors who compare Eldridge Flow Meter Catalog models before they buy. Most of those requests focus on premium thermal mass gas flow transmitters in two body styles. Insertion probes handle large pipes and ducts. Inline flow bodies handle small gas lines from DN15 to DN50.
The standard output options are 4-20 mA, 4-20 mA HART, RS485 Modbus RTU, and pulse. Sensor elements are PT100 or thermopile type. Calibration is normally done for air, nitrogen, methane, carbon dioxide, oxygen, biogas, or argon. Silver Automation Instruments carries the same range of outputs and calibration gases without forcing you to change your control system wiring.
Sensor and Transmitter Specifications
Our premium thermal mass gas flow transmitters cover pipe sizes from DN15 to DN3000. Inline models fit DN15, DN20, DN25, DN40, and DN50 lines with process connections from 1/4 inch NPT to 1 inch NPT. Insertion models use a 3/4 inch NPT compression fitting or a ball valve retractor for hot tap installation. Probe lengths range from 300 mm to 1500 mm.
Flow range depends on gas density and pipe diameter. A typical DN25 inline air transmitter covers 0.5 Nm3/h to 200 Nm3/h at 5 bar. A DN200 biogas insertion probe can measure 20 Nm3/h to 1600 Nm3/h at 0.3 bar. Accuracy is plus or minus 1.0 percent of reading plus 0.5 percent full scale. Repeatability is plus or minus 0.2 percent full scale. Temperature rating for standard inline models is -20 °C to 120 °C. Remote electronics can handle gas temperatures up to 200 °C on insertion probes.
Wetted parts are 316L stainless steel. Hastelloy C22 is available for corrosive gas applications. Enclosure rating is IP65 or IP67. Hazardous area approvals include ATEX Zone 1, ATEX Zone 2, NEC Class I Division 2, and IECEx. Power supply is 18 to 36 VDC. Most users run the loop at 24 VDC.
Direct Mass Flow Without Extra Instruments
A thermal mass flow transmitter reports mass flow directly in kg/h, Nm3/h, or scfm. You do not need a temperature sensor, a pressure transmitter, or a flow computer. This cuts the installed cost on combustion air, stack gas, biogas, and compressed air lines. The sensor measures heat transfer from a heated RTD to a reference RTD. Gas velocity changes the cooling rate. The transmitter converts that signal to mass flow.
In practice this works well for gases with stable composition. We have seen many sites where a customer added a thermal mass meter only after a vortex meter failed on low velocity. A paint manufacturer in Vietnam replaced a differential pressure setup with one DN40 inline thermal mass transmitter on a compressed air header. The pressure was 8 bar and the temperature was 30 °C. The flow range was 80 Nm3/h to 800 Nm3/h. The installation took one day.
Applications Where These Transmitters Fit
Compressed air systems in food and beverage plants often use inline thermal mass transmitters on DN25 to DN80 branch lines. A typical setup reports air flow at 7 bar, 25 °C, and 50 to 500 Nm3/h. The 4-20 mA signal goes to a PLC or a paperless recorder.
Biogas lines from anaerobic digesters are dirty and wet. Insertion thermal mass probes handle these conditions better than many other gas meter types. For a palm oil mill in Indonesia, we supplied a D
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Natural gas distribution stays a strong application. A DN25 inline meter with 4-20 mA HART can send mass flow and diagnostics to a flow computer. Typical pressure is PN40. Typical flow range is 1 Nm3/h to 80 Nm3/h depending on pressure. For hazardous areas, choose ATEX Zone 1 or NEC Class I Division 2.
Stack gas and flue gas applications need an insertion probe with a long stem. These lines often run negative pressure or very low positive pressure. We supply probes up to 1500 mm long for duct sizes above DN500. Process temperature can reach 150 °C on standard probes. Specify the gas components and moisture level when you ask for a quote.
How to Specify a Thermal Mass Gas Flow Transmitter
Most engineers skip this part and then face delays. Here is the thing. Thermal mass flow meters depend on gas composition, pressure, and temperature. You need to list all three data points, not just pipe size. A meter calibrated for air will not read methane correctly because the thermal properties differ. If your gas mix changes often, we can calibrate for the expected mix and note the accuracy limit.
Send us the following details for a quote. Gas type and gas composition. Pressure in bar. Temperature in °C. Pipe size in DN. Flow range in kg/h or Nm3/h. Process connection type. Signal output needed. Hazardous area classification. With these eight items we can recommend an inline model or an insertion probe from our thermal mass flow transmitter range.
FAQ
What is the output signal from Silver Automation Instruments thermal mass gas flow transmitters?
Standard output is 4-20 mA. You can also specify 4-20 mA HART, RS485 Modbus RTU, or pulse. Power supply is 18 to 36 VDC, with 24 VDC being the most common field voltage.
Can these transmitters measure biogas with high moisture?
Yes. Insertion probes with 316L stainless steel wetted parts and a ball valve retractor handle wet biogas from digesters. Tell us the moisture level and methane content before calibration. We may add a water trap or heated sensor option for very wet gas.
What pipe sizes do insertion and inline models cover?
Inline models cover DN15 to DN50. Insertion models cover DN50 to DN3000. For rectangular ducts we use the equivalent diameter and specify probe length.
How is the flow transmitter calibrated for different gases?
Calibration is performed in our facility using the actual gas or a known gas mixture. Air is a common reference gas. For methane, natural gas, and biogas we use composition data from your site to correct the calibration curve and set the flow range.
What information do you need to prepare a quote?
Send us your gas type, pressure (bar), temperature (°C), pipe size (DN), and flow range in kg/h or Nm3/h. Also include signal output and hazardous area class. You can contact Silver Automation Instruments by phone or message.
Contact and Quote Request
For a price on a premium thermal mass gas flow transmitter, send your gas type, pressure (bar), temperature (°C), pipe size (DN), and flow range. We respond within one working day with a model, datasheet, and quotation.
Tel: +86-25-68650347
Whatsapp: +86-25-52155837
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Silver Automation Instruments supplies thermal mass gas flow transmitters, Coriolis mass flow meters, electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, oval gear flow meters, pressure transmitters, and paperless recorders to industrial users and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
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