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Refrigerant Flow Meter with Totalizer: Seamlessly Logging Cumulative Chemical Weights
Quick Answer: A Coriolis mass flow meter with a built-in totalizer measures mass flow directly and logs cumulative weight in kilograms or tonnes. No manual density correction or PT100 compensation is needed. This approach gives you a precise batch record for refrigerant charging, chemical dosing, or inventory audits.
Silver Instruments supplies industrial refrigerant flow meters with totalizer functions for HVAC production lines, chiller test benches, and ammonia recovery stations. The transmitter shows live flow rate, fluid density, and total passed mass on a backlit LCD. The accumulated value persists through power cycles because it sits in non-volatile memory. Our customers in Southeast Asia and the Middle East use this data for quality logs and supplier billing.
Why a Totalizer Beats a Flow Rate Signal Alone
In practice, a 4-20 mA flow rate signal only tells you what is happening right now. To get total weight, you must integrate that signal in a PLC or DCS. Most engineers skip this step because it adds analog drift and scan time errors. A totalizer inside the meter handles the integration with microsecond resolution. The result is a single register that counts every gram straight from the mass flow sensor. We have seen this on customer sites many times. A chiller factory near Ho Chi Minh City swapped a paddle-wheel setup for a Silver Instruments Coriolis meter with totalizer. Their batch deviation shrank from 2.5% to under 0.15%, and warranty claims dropped.
How a Coriolis Meter Logs Chemical Weight Accurately
The sensor tubes oscillate at their natural frequency. Mass flow creates a phase shift between inlet and outlet. The transmitter calculates instantaneous mass flow and passes it to the totalizer function block. Because the Coriolis principle is immune to density swings, viscosity changes, or gas slugs, the total keeps climbing with full accuracy. For refrigerant R410A running at 20 bar and 45 degrees Celsius, the meter needs no separate density table. It works from minus 40 to 150 degrees Celsius. This direct mass method suits R134a, R22, R407C, and anhydrous ammonia without re-calibration.
Key Specs You Will Find in a Silver Instruments Quotation
Our standard refrigerant flow meter with totalizer covers line sizes from DN06 to DN80. For charging skids, DN15 and DN20 are the most common requests. Mass flow accuracy reaches plus or minus 0.1% of rate for liquids and 0.5% for gas-phase refrigerant. Wetted parts are 316L stainless steel with Hastelloy options for aggressive fluids. The transmitter outputs 4-20 mA HART, pulse per kg, and RS485 Modbus RTU. You can read the totalizer value from holding register 40001, or set a programmable solid-state relay to pulse once per tonne. ATEX Zone 1 certification is available when specified.
A Real Installation: Refrigerant Recovery in South America
Last year, a customer in Brazil asked us for a meter to track recovered R404A in a service center. They installed a DN15 Coriolis flow meter between the recovery cylinder and the vacuum pump. The t
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How to Connect to a PLC, Recorder, or Cloud
You do not need a fieldbus guru to integrate the totalizer. The local display already gives you the value. For remote monitoring, map the Modbus register to a PLC or a paperless recorder. Silver Instruments offers an 8-channel paperless recorder that archives totalizer logs to a USB stick. Another option: use the pulse output to drive an electromechanical counter. This approach is still common in Middle East water treatment plants and ammonia cold stores where a simple local counter is preferred over SCADA. Both methods let you capture the cumulative weight without any IT headaches.
How to Order: Give Us These 5 Details
To prepare an exact quote for your refrigerant flow meter with totalizer, we need to know the refrigerant type, operating pressure in bar, fluid temperature in degrees Celsius, pipe size in DN, and the flow range in kg per hour. Also mention if you need Ex-proof approval, PTFE or Kalrez seals, or a remote-mounted transmitter for tight spaces. Send these details to Silver Instruments at [email protected], call Tel: +86-25-68650347, or message us on Whatsapp: +86-25-52155837. WeChat for Chinese-speaking clients is +86 15365082610. We normally reply with a datasheet and price within one working day, and we ship via DHL to Oceania, the Middle East, Latin America, and Africa.
Frequently Asked Questions
Q: Will the totalizer keep its value if the plant has a blackout?
A: Yes. The transmitter stores the accumulated mass in non-volatile memory automatically. After power returns, the total continues from the saved figure. No battery backup is required.
Q: Can I reset the totalizer through a digital command?
A: You can reset it from the local keypad, via a Modbus write command, or by a dry contact input if configured. Most batch applications reset at the start of each job.
Q: What is the smallest amount the totalizer can register?
A: For a DN06 meter, the turndown ratio is 20:1. The minimum measurable mass flow is roughly 30 kg per hour. The totalizer accumulates every valid reading down to that cut-off with no drift.
Q: Is this meter safe for ammonia refrigerant?
A: Yes. Order the ammonia-compatible version with fully welded 316L wetted parts and appropriate seal materials. Mention ammonia service when you contact us, and we will supply material certificates and special cleaning documentation.
Q: How do you verify the totalizer accuracy during commissioning?
A: The quickest field check uses a calibrated weigh scale. Divert flow into a vessel on the scale, then compare the weight reading to the totalizer display. The deviation stays within the meter accuracy class.
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