『R600a Flow Meter: Microfluidics for Isobutane Domestic Refrigeration Loops』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
R600a Flow Meter: Microfluidics for Isobutane Domestic Refrigeration Loops
Quick Answer: A micro Coriolis mass flow meter from Silver Automation Instruments gives you direct mass measurement of isobutane (R600a) inside domestic refrigerator cooling loops. The meter covers minuscule flow rates, 0.05 kg/h to 30 kg/h, with ±0.2 % accuracy and ATEX safety for flammable refrigerants. This removes guesswork from the charge station and helps refrigerator makers hit tight A+++ energy labels.
Why Microfluidics Matters for R600a Domestic Refrigeration
Most domestic refrigerators run on a charge of 50 to 150 grams of R600a. A deviation of just 1 gram shifts the evaporator superheat and pulls the COP down. Old timed charge systems drift when supply pressure moves, when the liquid temperature changes, or when the cylinder level drops. In practice, fridge assembly plants in Thailand and Mexico we visited still rely on a stopwatch and a solenoid valve. But a clock cannot see density, and it cannot see bubbles. A microfluidic Coriolis meter can. Because it reads mass directly, not volume, the charge stays rock solid even on a hot afternoon when the liquid isobutane expands.
Silver Instruments Micro Coriolis Flow Meter for R600a
Silver Automation Instruments supplies a dedicated micro Coriolis meter designed for hydrocarbon refrigerants. The sensor wetted parts are 316L stainless steel, fully compatible with isobutane. Process connections come in DN1.5, DN2, and DN4. The flow range goes from 0.05 kg/h up to 30 kg/h, which easily covers a fridge charge cycle of 2 to 5 kg/h peak flow. Accuracy is ±0.2 % of rate, and the repeatability is better than ±0.05 %. Output options include 4-20 mA HART, pulse, and RS485 Modbus RTU, so the meter talks to any PLC or batch controller on the line.
The meter carries ATEX II 2G Ex ia IIC T4 certification. That means you can place it inside a Zone 1 area where R600a vapor may be present. The electronics can be remote mounted up to 100 metres away. We often see engineers pair this meter with a simple batch controller that stops the charge valve exactly at the target gram weight. No overfill, no underfill.
Here is the thing. Most micro Coriolis meters on the market struggle below 0.5 kg/h, or they need long settling times. Our sensor tube geometry is tuned for low cP fluids like liquid isobutane, so you get a stable reading within 200 milliseconds. This matters when you charge a fridge every 12 seconds on a moving conveyor.
Send us your refrigerant type, operating pressure (bar), temperature (°C), pipe size (DN), and target flow range in kg/h. We will propose a complete meter with transmitter, cable, and
A Real Site Example: Refrigerator Line in Vietnam
Last year a Vietnamese white goods manufacturer approached Silver Instruments with a simple problem. Their pneumatically timed R600a charge station gave a shot-to-shot variation of ±3 grams on a nominal 80 gram charge. Three percent of the units rolled off with an energy label mismatch and needed rework. The engineering team grumbled that a Coriolis meter was too expensive for a domestic fridge. We did a payback calculation on a call. The meter cost was offset by refrigerant savings and rework reduction in 11 weeks. After installation of a DN2 micro Coriolis meter from Silver Instruments, the charge variation dropped below ±0.5 grams. Rework from refrigerant mischarge fell from 3 % to 0.1 %. The line now charges 280 units an hour without human adjustment.
FAQ
What is the minimum flow rate you can measure with R600a?
Our standard micro Coriolis meter reads down to 0.05 kg/h for liquid isobutane. That is roughly 0.8 grams per minute. The turndown ratio is 100:1, so the same meter can also handle a 30 kg/h flush cycle.
Does this meter work with propane (R290) as well?
Yes. The sensor and seals are fully compatible with R290. We just adjust the calibration factor for the slight density difference. The same ATEX certification covers propane too.
Do I need ATEX certification for a domestic refrigerator production line?
Isobutane is classified as A3 flammable. Most local codes ask for ATEX Zone 2 equipment around the charge station and in the test room. Our meter is ATEX II 2G Ex ia IIC T4, so it suits Zone 1 and Zone 2. You get intrinsic safety without purging or pressurization.
What signal do I get from the meter for batch control?
You have three options. A 4-20 mA HART signal for simple integration with a PLC. A scalable pulse output where each pulse represents 0.1 gram, perfect for a batch counter. And RS485 Modbus RTU for digital reading of mass flow, density, and temperature. Most refrigerator plants pick pulse output plus 4-20 mA for redundancy.
How do I request a quote with delivery time?
Send your charge mass (gram), flow rate (kg/h), pipe connection size (DN), and operating temperature to [email protected]. Include your country and expected order quantity. For urgent pricing, message us on WhatsApp at 86-135-12131526. We typically send a formal quotation within one business day.
Hot News
Related AD
