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Refrigerant Flow Meter with Totalizer: Tracking Cumulative Chemical Inventory Weights
Quick Answer: A Coriolis mass flow meter with built‑in totalizer gives you direct cumulative weight (kg) of refrigerant or chemical without density tables or pressure‑temperature compensation. Silver Instruments supplies DN15 to DN80 meters for R134a, R410A, R744, ammonia and other chemicals with 0.1% accuracy and ATEX Zone 1 certification. Send us your refrigerant type, pipe diameter (DN), operating pressure (bar), temperature (°C) and typical flow range (kg/h) for a price and lead time.
Why a Totalizer Matters in Refrigerant and Chemical Inventory
Plant managers and service contractors need to know exactly how many kilograms of refrigerant enter a storage vessel, leave a cylinder filling line or return from a recovery job. A transmitter that only outputs instantaneous flow (kg/h) forces you to trust external counters in a PLC or DCS and any communication gap means lost kilos. A Coriolis meter with an onboard totalizer stores the running sum inside the meter electronics, backed by a non‑volatile memory that keeps the value through a power cycle. You walk up to the local display, read the total weight and log it. You do not have to integrate. You do not have to worry about SCADA scan rates. That removes a whole layer of uncertainty from inventory reconciliation.
Mass Measurement Without Temperature Compensation
Here is the thing: turbine meters, vortex meters and DP devices need the actual density to convert volume to mass. Density of a refrigerant changes sharply with temperature and pressure, especially near saturation. A Coriolis meter measures mass flow directly by sensing the Coriolis force generated by the fluid. It does not care if the fluid is subcooled liquid, superheated gas or two‑phase (within limits). When you charge a chiller with R410A at 28°C on a roof in Bangkok or withdraw ammonia at -33°C in a cold store in Indonesia, the totalizer still adds true kilograms. Most engineers skip the compensation step because the meter does it for them.
Where We See This Used Every Day
In practice we ship these totalizer meters into four repeat applications. First, HVAC service companies in Vietnam and the Philippines that recover, reclaim and resell refrigerants: they bill end users by the exact kilogram recovered, backed by a totalizer print‑out. Second, refrigerant cylinder filling stations in Thailand and Malaysia: they batch 12.5 kg or 22.7 kg cylinders with the totalizer stopping a valve at the target preset. Third, chemical blending in small Indonesian plants: they dose a set mass of solvent or propellant into a mix tank and the totalizer reduces the number of weigh scales they need. Fourth, ammonia chiller plants in the Middle East: operators monitor total ammonia consumption month by month and cross‑check against inventory tanks.
We have seen this on customer sites many times. A paint manufacturer in Southern Vietnam once tried a low‑cost paddle wheel meter on a solvent toluol line. Density drift caused a 4% error in their monthly mass balance and raw material cost was high enough that the error exceeded the meter price in two weeks. They replaced it with a DN15 Coriolis totalizer and the inventory variance dropped below 0.3%.
Model Pairing and Typical Specs
For most refrigerant and chemical inventory jobs we recommend our DMF‑1 Coriolis mass flow meter with the TM01 totalizer‑capable converter. Standard features include a two‑line backlit LCD showing rate (kg/h) and cumulative total (kg), a resettable batch total that does not erase the m
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Typical line sizes we supply:
DN15: 0 – 2 000 kg/h, process connection ½ inch or 15 mm tube.
DN25: 0 – 10 000 kg/h, suitable for bulk loading arms.
DN50: 0 – 40 000 kg/h, often seen on tanker truck offloading in chemical yards.
DN80: up to 100 000 kg/h for large‑tonnage ammonia systems.
Accuracy is ±0.1% of rate on liquid, repeatability ±0.05%. Turndown is 20:1 real, not a marketing number. Pressure rating goes to 100 bar standard, 345 bar as an option. Temperature range is -50 °C to +125 °C. ATEX Zone 1 IIB+H2 T6 certification is available ex‑works, which matters a lot when you handle butane or isobutane. PT100 on‑board temperature measurement is included, so you get fluid temperature at no extra cost.
Integration Into a Site That Already Uses PLCs
Because most plants already have a Siemens, Allen‑Bradley or Delta PLC, the totalizer must pass the count upstream without hassle. We provide the 16‑bit integer representation of the totalizer value via Modbus registers, plus a 32‑bit floating‑point register for the same value. That avoids overflow quirks when total kilograms cross 65 535. A reset command can be sent over Modbus for batch runs while the master total remains untouched. For sites without PLCs, a simple remote batch controller can read the totalizer and drive a solenoid valve. We have wiring diagrams for Omron and Fatek PLCs that we share during commissioning.
FAQ
Can the totalizer handle multiple refrigerants?
Yes. The mass total is independent of fluid type. You change the configuration file via the display or HART and the meter immediately reads mass correctly for R134a, R410A, R404A, ammonia, CO₂ or custom chemical. No physical recalibration is needed.
Is the non‑resettable totalizer really tamper‑proof?
The master register is write‑protected at the firmware level. Operators can view it but cannot clear it without a service password. We have many customers who use the logged master total for regulatory reporting to environmental agencies that track refrigerant usage.
What happens during a power outage?
The totalizer value saves to EEPROM every few seconds. When power returns, the meter resumes counting from the stored value. Typically you lose less than 2 seconds of flow data, which is negligible in continuous processes.
Do I need a straight run?
A Coriolis meter needs zero straight upstream or downstream pipe. Installation in tight skids, charging stations or on a mezzanine is easy. That is a big advantage over vortex or turbine meters on refrigerant lines where space is often tight.
What about servicing and calibration?
Silver Instruments supports field calibration with a master meter rental programme. We also offer factory recalibration at our Nanjing centre. Typical turnaround is 5 working days. We can supply a spare meter during the calibration window so your operation does not stop.
To request a quote, send your parameters directly to our engineers. Email: [email protected]. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526. Tell us the refrigerant or chemical name, pipe size (DN), pressure (bar), temperature (°C) and flow range in kg/h. We will reply with a data sheet, compliance certificates and a detailed price within one working day.
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