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Refrigerant Flow Meter 1/2 Inch: Standard Copper Pipeline Fitting Configurations
Quick Answer: For 1/2 inch copper refrigerant lines, a Coriolis mass flow meter with standard flare or compression fittings gives direct mass flow, density, and temperature. It ignores bubbles, oil, and pressure changes. Silver Instruments micro Coriolis meters with DN15 copper connections measure refrigerants like R410A or R134a without recalibration and deliver ±0.2 percent accuracy.
The Standard 1/2 Inch Copper Fitting in HVAC
Most small-to-medium refrigeration and air conditioning circuits use 1/2 inch (DN15) copper tube. The connection is typically a 45-degree SAE flare or a brass compression fitting. This standard comes from decades of HVAC engineering practice in markets like Australia, Southeast Asia, and the Middle East. You find it on refrigerant charging machines, refrigerant recovery units, and chiller test benches. Because the tube size is fixed, any flow meter inserted must match the 1/2 inch connection without adapters that introduce leaks. Silver Instruments builds the flow sensor body with integral 1/2 inch copper male or female connections. That means no extra welding, no reduction fittings, and a pressure rating of 100 bar at 25 degrees Celsius.
What Makes Refrigerant Flow Measurement Tricky
Here is the thing. Refrigerants change phase easily. Liquid refrigerant can flash into gas if pressure drops across a restriction. A turbine meter or a gear meter cannot handle two-phase flow. You get bubbles in the measuring chamber and the reading becomes unreliable. Oil carryover from the compressor adds more complexity. Viscosity changes from 3 cP to over 50 cP when oil mixes with liquid refrigerant. A volumetric meter drifts. A Coriolis meter does not care about phase, viscosity, or oil concentration. It measures mass directly, so you see the true refrigerant charge in kg or lb.
Recommended Silver Instruments Solution
We use a micro Coriolis mass flow meter with 1/2 inch copper process connections. The wetted tube inside is 316L stainless steel, fully compatible with common refrigerants R22, R134a, R404A, R410A, and R32. The standard output is 4-20 mA HART with Modbus RS485 as an option. Process temperature range is -40 °C to 125 °C. Mass flow accuracy reaches ±0.15 percent of rate for liquid refrigerant. The meter body is compact, under 8 kg, and installs directly in a refrigerant charging skid or a test bench panel. Because we supply the fitting as a single-piece copper weldment, you do not need transition joints that collect leak points.
A Real Example from Southeast Asia
A chiller manufacturer in Thailand used a positive displacement meter on th
How to Order and Configure Your Meter
Send us your refrigerant type, process temperature range, inlet pressure, and required flow range in kg/h or lb/min. We will select the right tube size and calibrate the meter on a refrigerant-matched test rig. Standard lead time is 10 working days for a DN15 copper connection model. For hazardous area installations, we can supply ATEX Zone 2 or IECEx certification. To get a quote, email [email protected] or call +86-25-68650347. WhatsApp number is +86-25-52155837 and WeChat ID is +86 15365082610. Tell us your country and application and we will provide a freight-inclusive price for your region.
Frequently Asked Questions
Can the 1/2 inch flow meter handle both liquid and gas refrigerant?
Yes. A Coriolis meter measures mass flow regardless of phase. You can use the same meter for liquid charging and for gas recovery if the flow range fits. The meter will report density in kg/m³ so you can detect phase changes in real time.
What connection standard is on the copper fittings?
We supply 1/2 inch OD tube with a 45-degree SAE flare face as standard. Compression nut fittings are also available. The copper alloy is C12200, rated for refrigerants up to 50 bar working pressure. You can specify male or female connection.
Does oil in the refrigerant affect the reading?
No. The Coriolis principle measures mass directly. Oil fraction changes liquid density but mass flow stays accurate. We have verified this with POE oil mixtures up to 8 percent mass concentration on R410A. There is no drift or offset.
Can I get a meter with ATEX certification?
Yes. We can build the 1/2 inch copper model with ATEX Ex ec or Ex ia certification for Zone 2 gas environments. The sensor and transmitter housing meet IP66 protection. You need to specify the gas group and temperature class when ordering.
What is the minimum flow this meter can detect?
The DN15 Micro Coriolis meter reads down to 0.8 kg/h for liquid refrigerants with a turndown ratio of 100:1. For very low flow dosing, we can offer a smaller 1/4 inch tube option. Most customers in R134a charging lines work between 5 kg/h and 80 kg/h.
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