{"id":50198,"date":"2026-05-14T15:34:25","date_gmt":"2026-05-14T15:34:25","guid":{"rendered":"https:\/\/chintanengineers.in\/positive-displacement-flow-meter-vs-coriolis-diesel\/"},"modified":"2026-05-14T15:34:25","modified_gmt":"2026-05-14T15:34:25","slug":"positive-displacement-flow-meter-vs-coriolis-diesel","status":"publish","type":"post","link":"https:\/\/chintanengineers.in\/ml\/positive-displacement-flow-meter-vs-coriolis-diesel\/","title":{"rendered":"\u0d21\u0d40\u0d38\u0d7d \u0d1f\u0d4d\u0d30\u0d3e\u0d7b\u0d38\u0d4d\u0d2b\u0d31\u0d3f\u0d28\u0d41\u0d33\u0d4d\u0d33 PD vs \u0d15\u0d4b\u0d31\u0d3f\u0d2f\u0d4b\u0d32\u0d3f\u0d38\u0d4d \u0d2b\u0d4d\u0d32\u0d4b \u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c"},"content":{"rendered":"<div class=\"gfm-markdown\"><p>A 1% calibration drift on a 10,000L\/day diesel transfer operation costs exactly Rs. 2.7 Lakhs per month in untracked fuel at current prices. Over my 22 years calibrating flow measurement systems across India\u2014from the heavy-duty loading gantries at ONGC refineries to dusty, off-grid fleet depots in rural Gujarat\u2014I have seen procurement teams bleed capital because they either underestimated their measurement needs or vastly over-specified their hardware.<\/p>\n\n<p>When setting up your depot&#039;s fuel accountability, the choice usually comes down to two technologies: the traditional workhorse, the Positive Displacement (PD) flow meter, and the highly advanced Coriolis mass flow meter. <\/p>\n\n<p>Procurement managers frequently ask me if they need to spend upwards of Rs. 4 Lakhs on a Coriolis unit to achieve true custody-transfer accuracy, or if a Rs. 50,000 PD meter will satisfy Legal Metrology inspectors and their own ERP accounting. <\/p>\n\n<p>I prefer to strip the marketing away from the physics. We need to look at the actual engineering, the OIML R117 compliance parameters, and the hard Total Cost of Ownership (TCO) data to determine exactly which fuel flow meter types belong on your diesel transfer skid.<\/p>\n\n<blockquote>\n<p>[!STAT]<\/p>\n<p><strong>\u20b932.4 Lakhs\/year<\/strong> \u2014 The minimum financial leakage a medium-sized transport fleet experiences when using uncalibrated \u00b12% mechanical meters instead of high-accuracy \u00b10.2% custody transfer units.<\/p>\n<\/blockquote>\n\n<h2>The Physics of Accountability: Swept Volume vs. Mass Oscillation<\/h2>\n\n<p>Before spending lakhs on a dispensing skid, you need to know exactly what the meter is measuring. The core difference between a positive displacement flow meter vs coriolis is fundamentally volumetric versus mass measurement.<\/p>\n\n<h3>Positive Displacement: The Mechanical Truth<\/h3>\n<p>Positive displacement meters (like oval gear, sliding vane, or rotary piston types) operate on a very simple, undeniable mechanical principle. The fluid physically cannot pass through the meter without moving the internal components. Each rotation of the gears or stroke of the piston displaces a highly specific, mathematically fixed volume of liquid.<\/p>\n\n<p>When we calibrate a unit like our <strong>CE-113<\/strong> high-accuracy meter, we are proving that exactly &#039;X&#039; volume of diesel equals exactly one rotation of the calibrator wheel. Why is this ideal for diesel? Because diesel&#039;s inherent lubricating properties perfectly suit the internal moving parts of a PD meter, ensuring a long service life with minimal pressure drop.<\/p>\n\n<h3>Coriolis: The Vibrating Tube<\/h3>\n<p>A Coriolis meter measures mass directly. It drives fluid through twin parallel tubes that are electro-magnetically oscillated at a specific resonant frequency. As the fluid mass flows through the oscillating tubes, it creates a phase shift in the vibration (the Coriolis effect). Sensors measure this twist, which is directly proportional to the mass flow rate. <\/p>\n\n<p>Coriolis meters are undoubtedly engineering marvels. They measure mass, density, and temperature simultaneously. But for standard diesel transfer, they are often a massive misallocation of capital.<\/p>\n\n\n<p><img src=\"https:\/\/chintanengineers.in\/wp-content\/smush-webp\/2026\/05\/engineering-cutaway-comparing-internal-gears-of-positive-dis-scaled.jpg.webp\" alt=\"Engineering cutaway comparing internal gears of positive displacement flow meter vs coriolis vibrating tubes\" loading=\"lazy\" decoding=\"async\" \/><\/p>\n\n\n<blockquote>\n<p>[!TIP]<\/p>\n<p>I&#039;ve calibrated enough turbine meters to know they don&#039;t belong anywhere near highly viscous or dirty fuels\u2014they suffer from severe slip when viscosity shifts due to temperature changes. For anything above 5 cSt, rely strictly on Positive Displacement technology.<\/p>\n<\/blockquote>\n\n<h2>Technical Comparison: Accuracy, Pressure Drop, and Diesel Viscosity<\/h2>\n\n<p>When evaluating diesel measurement accuracy, you cannot look at a manufacturer&#039;s brochure in isolation. You must look at how the meter behaves dynamically under Indian environmental conditions.<\/p>\n\n<h3>Custody Transfer Accuracy and OIML R117<\/h3>\n<p>Both meter types are capable of achieving custody-transfer accuracy limits defined by OIML R117 and the Legal Metrology Act, 2009. <\/p>\n\n<ul>\n<li><strong>Coriolis Accuracy:<\/strong> Typically \u00b10.1% to \u00b10.2% of mass flow.<\/li>\n<li><strong>High-Accuracy PD Accuracy:<\/strong> Units like the digital <strong>CE-105<\/strong> or the mechanical <strong>CE-113<\/strong> deliver \u00b10.2% volumetric accuracy across their specified flow ranges (e.g., 25 \u2013 1300 L\/min).<\/li>\n<\/ul>\n\n<p>Why pay for mass measurement when the legal standard is volumetric? If you are trading diesel by volume (liters) at standard temperature, a \u00b10.2% PD meter easily satisfies all commercial and legal requirements for bulk transfer in India.<\/p>\n\n<h3>Managing Pressure Drop in Transfer Systems<\/h3>\n<p>Pump sizing heavily depends on the pressure drop (\u0394P) introduced by the meter.<\/p>\n\n<p>Because of their restrictive U-tube or delta-tube geometries, Coriolis meters create significant pressure drop at high flow rates. You often have to upsize your transfer pump\u2014costing more power and money\u2014just to push fluid through the meter.<\/p>\n\n<p>PD meters like the <strong>CE-110<\/strong> diesel flow meter are designed with a straight-through body and high-clearance rotors. At 120 LPM, the pressure loss across a CE-110 is negligible (typically less than 0.3 Bar), meaning smaller pumps and lower energy consumption. <\/p>\n\n<h3>The Viscosity Advantage<\/h3>\n<p>Diesel viscosity changes drastically depending on whether you are pumping it on a 45\u00b0C summer afternoon in Rajasthan or a 4\u00b0C winter morning in Himachal. <\/p>\n\n<p>Coriolis meters are technically immune to viscosity changes. But here&#039;s a detail often overlooked: PD meters actually perform <em>better<\/em> as fluid viscosity increases slightly. The thicker the fluid, the less &quot;slip&quot; (internal leakage bypass) occurs between the gears and the housing. With diesel sitting comfortably between 2.0 to 4.5 mm\u00b2\/s, a well-machined PD meter maintains a near-perfect K-factor regardless of the season.<\/p>\n\n<blockquote>\n<p>[!CTA]<\/p>\n<p><strong>Losing fuel to inaccurate mechanical registers?<\/strong><\/p>\n<p>Upgrade your depot with the CE-113 High Accuracy PD Meter, featuring \u00b10.2% accuracy and integrated ticket printing for absolute batch accountability.<\/p>\n<p><a href=\"https:\/\/chintanengineers.in\/products\/fuel-flow-meter\/\">View Fuel Flow Meters<\/a> | <a href=\"\/contact-us\/\">Request Sizing Sheet<\/a><\/p>\n<\/blockquote>\n\n<h2>The Indian Industrial Context: Dust, Humidity, and Voltage<\/h2>\n\n<p>A datasheet generated in a temperature-controlled lab in Germany doesn&#039;t mean much when the meter is bolted to a loading gantry in the middle of a dusty industrial estate in Vapi or Ankleshwar.<\/p>\n\n<p><strong>Environmental Robustness<\/strong><\/p>\n<p>Coriolis transmitters require highly stable power supplies and are sensitive to heavy pipe vibration. A poorly isolated pump right next to a Coriolis meter can induce resonant frequencies that destroy its accuracy. Furthermore, erratic grid voltage can fry the complex transmitter electronics.<\/p>\n\n<p>Conversely, pure mechanical PD meters like the <strong>CE-113<\/strong> or the <strong>CE-110<\/strong> (which features a 4 Digit Reset Total and 6 Digit Cumulative Total mechanical counter) require absolutely no external power. They measure purely off fluid momentum. Even our digital PD meters (like the <strong>CE-105<\/strong>) utilize ruggedized, battery-backed electronics that ignore power cuts completely.<\/p>\n\n\n<p><img src=\"https:\/\/chintanengineers.in\/wp-content\/smush-webp\/2026\/05\/rugged-mechanical-positive-displacement-diesel-flow-meter-in-scaled.jpg.webp\" alt=\"Rugged mechanical positive displacement diesel flow meter installed at an industrial depot in India\" loading=\"lazy\" decoding=\"async\" \/><\/p>\n\n\n<blockquote>\n<p>[!NOTE]<\/p>\n<p>Under IS 14883 (the BIS standard for volumetric meters for viscous liquids), air elimination is a critical requirement for accurate volumetric measurement. Air passing through a PD meter registers as volume. Always install an air separator upstream of your flow meter in bulk transfer setups.<\/p>\n<\/blockquote>\n\n<h2>TCO and ROI: Flow Meter Price in India<\/h2>\n\n<p>Looking at standard flow meter pricing in India for diesel applications, the capital expenditure disparity is vast. Let&#039;s break down a standard 300 L\/min diesel loading gantry requirement.<\/p>\n\n<h3>Capital Expenditure (CAPEX)<\/h3>\n<ul>\n<li><strong>Standard Coriolis Meter (2-inch):<\/strong> \u20b93,50,000 \u2013 \u20b95,50,000<\/li>\n<li><strong>High-Accuracy PD Meter (CE-113 with air eliminator &amp; strainer):<\/strong> \u20b985,000 \u2013 \u20b91,30,000<\/li>\n<li><strong>Standard Depot PD Meter (CE-110, mechanical):<\/strong> \u20b935,000 \u2013 \u20b955,000<\/li>\n<\/ul>\n\n<h3>Operational Expenditure (OPEX)<\/h3>\n<p>Sales reps love to point out that Coriolis meters have no moving parts, resulting in lower theoretical maintenance. But if the transmitter fails\u2014and under erratic grid power, they do\u2014the replacement cost is nearly 60% of the meter&#039;s original price. <\/p>\n\n<p>PD meters require periodic maintenance. Strainers must be cleaned, and internal Viton\/Buna seals may need replacing every 4-5 years depending on throughput. However, a rebuild kit for a CE-110 costs a fraction of an electronic sensor board. Any on-site fitter can service a mechanical PD meter; you do not need to fly in a specialized instrumentation technician with a proprietary diagnostic laptop.<\/p>\n\n<h3>ROI Justification Table: 5,000 L\/Day Fleet Depot<\/h3>\n\n<table>\n<tr><td>Parameter<\/td><td>Coriolis Mass Meter<\/td><td>Digital PD Meter (CE-105)<\/td><td>Mechanical PD (CE-110)<\/td><\/tr>\n<tr><td>:&#8212;<\/td><td>:&#8212;<\/td><td>:&#8212;<\/td><td>:&#8212;<\/td><\/tr>\n<tr><td><strong>Initial Hardware Cost<\/strong><\/td><td>\u20b94,50,000<\/td><td>\u20b975,000<\/td><td>\u20b945,000<\/td><\/tr>\n<tr><td><strong>Installation\/Wiring Complexity<\/strong><\/td><td>High (Requires isolation)<\/td><td>Low (Battery\/24V)<\/td><td>Zero (Pure mechanical)<\/td><\/tr>\n<tr><td><strong>Diesel Accuracy<\/strong><\/td><td>\u00b10.15%<\/td><td>\u00b10.2%<\/td><td>\u00b10.5%<\/td><\/tr>\n<tr><td><strong>Monthly Calibration Drift Loss<\/strong><\/td><td>~75 Liters<\/td><td>~100 Liters<\/td><td>~250 Liters<\/td><\/tr>\n<tr><td><strong>Breakeven vs. Unmetered Setup<\/strong><\/td><td>14 Months<\/td><td>2.5 Months<\/td><td>1.5 Months<\/td><\/tr>\n<\/table>\n\n<p>For a standard transport operator, the CE-105 or CE-113 pays for itself in a single financial quarter.<\/p>\n\n<blockquote>\n<p>[!WARNING]<\/p>\n<p>Do not use water to flush a positive displacement diesel flow meter before commissioning. The internal tolerances are tight, and water lacks the lubricity of diesel. This will cause the internal gears to seize. Always prime and flush with clean diesel or light oil.<\/p>\n<\/blockquote>\n\n<h2>Sizing and Specifying Your Positive Displacement Meter<\/h2>\n\n<p>Once you settle on PD technology, you need to match the internal geometry and outputs to your operational realities. At Chintan Engineers, we categorize our fuel meters strictly by flow rate, accuracy requirements, and automation needs.<\/p>\n\n<h3>1. High-Volume Bulk Gantries (Custody Transfer)<\/h3>\n<p>If you are filling 20KL tankers, you need high flow rates and Legal Metrology grade accuracy.<\/p>\n<ul>\n<li><strong>Recommendation:<\/strong> <strong>CE-113<\/strong> High-Accuracy Flow Meter<\/li>\n<li><strong>Specs:<\/strong> 25 \u2013 1300 L\/min, \u00b10.2% accuracy, Aluminium body with Viton seals, max pressure 10 BAR.<\/li>\n<li><strong>Why:<\/strong> It features a calibrator adjustable to exactly 0.2%, and you can mount an integrated mechanical ticket printer. Every driver leaves with a hard-copy receipt stamped directly by the meter&#039;s internal mechanics.<\/li>\n<\/ul>\n\n<h3>2. Standard Fleet Depot &amp; Truck Stops<\/h3>\n<p>For standard dispensing where you just need reliable, daily cumulative totals without the hassle of electronics.<\/p>\n<ul>\n<li><strong>Recommendation:<\/strong> <strong>CE-110<\/strong> Mechanical Flow Meter<\/li>\n<li><strong>Specs:<\/strong> 20 \u2013 120 LPM, \u00b10.5% accuracy, 25mm connection.<\/li>\n<li><strong>Why:<\/strong> Extremely low pressure drop, high corrosion resistance, and a 6-digit cumulative totalizer that cannot be easily tampered with.<\/li>\n<\/ul>\n\n<h3>3. Smart PLC\/SCADA Integration<\/h3>\n<p>If your fuel farm requires data logging to an ERP or preset batching via a control room.<\/p>\n<ul>\n<li><strong>Recommendation:<\/strong> <strong>CE-105<\/strong> Digital Flow Meter<\/li>\n<li><strong>Specs:<\/strong> \u00b10.2% accuracy, pulse output, rugged digital design.<\/li>\n<li><strong>Why:<\/strong> Delivers the pure volumetric accuracy of a PD mechanism but translates it into crisp digital pulse trains or 4-20mA signals for remote SCADA monitoring.<\/li>\n<\/ul>\n\n\n<p><img src=\"https:\/\/chintanengineers.in\/wp-content\/smush-webp\/2026\/05\/comparison-of-mechanical-ticket-printer-flow-meter-ce-113-an-scaled.jpg.webp\" alt=\"Comparison of mechanical ticket printer flow meter CE-113 and digital display flow meter CE-105\" loading=\"lazy\" decoding=\"async\" \/><\/p>\n\n\n<blockquote>\n<p>[!CTA]<\/p>\n<p><strong>Need to integrate fuel flow data into your ERP?<\/strong><\/p>\n<p>Our digital flow meters offer standard pulse, 4-20mA, and RS485 outputs for seamless SCADA integration.<\/p>\n<p><a href=\"https:\/\/chintanengineers.in\/products\/fuel-flow-meter\/\">Explore Data Integration Options<\/a> | <a href=\"\/contact-us\/\">Speak to an Engineer<\/a><\/p>\n<\/blockquote>\n\n<h2>Installation Rules for Diesel Transfer Skids<\/h2>\n\n<p>I tell my clients this every day: Even the finest meter in the world will read garbage if installed poorly. When I commission flow measurement systems, I enforce three non-negotiable installation rules for volumetric meters.<\/p>\n\n<ol>\n<li><strong>Pre-Filtration is Mandatory:<\/strong> A PD meter is a precision-machined instrument. A welding slug or a piece of rust from an old storage tank will jam the rotors instantly. You must install a basket strainer (minimum 80 mesh for diesel) directly upstream of the meter. If you are experiencing unexplained pressure drops or flow stoppage, our <a href=\"https:\/\/chintanengineers.in\/troubleshooting-oil-flow-meters\/\">Oil Flow Meter Troubleshooting Guide<\/a> covers strainer blockages in detail.<\/li>\n<li><strong>Eliminate the Air:<\/strong> Remember what I said about air passing as volume? If your pump cavitates or your suction line draws air, the meter will over-register. Install an air eliminator tank between the pump and the flow meter.<\/li>\n<li><strong>Flow Profile:<\/strong> While PD meters do not require strict upstream straight pipe runs (unlike turbine or ultrasonic meters), maintaining a minimal straight run prevents turbulent fluid shear from prematurely wearing the bearings. <\/li>\n<\/ol>\n\n<p>If you are setting up a completely new depot dispensing skid, I highly recommend reviewing our <a href=\"https:\/\/chintanengineers.in\/fuel-dispenser-installation-guide-india\/\">Industrial Fuel Dispenser Setup Guide<\/a> to ensure your piping geometry is sound before you pour the concrete.<\/p>\n\n\n<p><img src=\"https:\/\/chintanengineers.in\/wp-content\/smush-webp\/2026\/05\/3d-diagram-showing-correct-installation-sequence-for-a-diese-scaled.jpg.webp\" alt=\"3D diagram showing correct installation sequence for a diesel flow meter with strainer and air eliminator\" loading=\"lazy\" decoding=\"async\" \/><\/p>\n\n\n<h2>Frequently Asked Questions<\/h2>\n\n<h3>Can Positive Displacement meters handle biodiesel or ethanol blends?<\/h3>\n<p>Yes, absolutely. However, the standard Buna-N seals used in standard diesel meters will degrade if exposed to high ethanol or aggressive biodiesel blends. We specify the CE-113 and CE-105 with Viton seals specifically to handle varying fuel chemistry without swelling or leaking.<\/p>\n\n<h3>I get asked this often: Why wouldn&#039;t I just use a cheap turbine meter for diesel?<\/h3>\n<p>Turbine meters (like our CE-210) are excellent for steady, low-viscosity applications. But diesel viscosity swings with temperature. As diesel thickens, it drags on the turbine blades, shifting the calibration curve. PD meters are mechanically immune to this slip profile, making them vastly superior for high-accuracy diesel accountability.<\/p>\n\n<h3>How often do I need to recalibrate a mechanical PD meter like the CE-110?<\/h3>\n<p>For internal accounting, we recommend verifying the meter against a master prover can once every 12 months. If the meter is used for custody transfer (selling fuel), the Legal Metrology Department of your respective state mandates verification and re-stamping on an annual basis.<\/p>\n\n<h3>Does the pressure drop of a PD meter damage my transfer pump?<\/h3>\n<p>No, provided the system is sized correctly. A properly sized meter like the CE-110 will induce less than 0.3 Bar of pressure drop at full flow. As long as your pump curve accommodates this minor head loss, there is no risk of pump cavitation or deadheading.<\/p>\n\n<h3>Can I retrofit a pulse output to an existing mechanical meter?<\/h3>\n<p>In many cases, yes. We can fit pulse transmitters to the mechanical registers of CE-113 units, allowing you to maintain localized mechanical totals while simultaneously feeding a PLC or batch controller.<\/p>\n\n<h2>Final Recommendation from the Field<\/h2>\n\n<p>Based on 22 years of field data, here is what I recommend for your operation: <\/p>\n\n<p>Do not overcapitalize on Coriolis technology if you are simply tracking liters of diesel pumped into trucks or generator day-tanks. The upfront cost, vulnerability to industrial vibrations, and electrical sensitivity negate its mass-measurement benefits for standard liquid hydrocarbons.<\/p>\n\n<p>For 95% of industrial, transport, and mining applications in India, <strong>high-accuracy positive displacement flow meters<\/strong> are the correct choice.<\/p>\n\n<p>If you require absolute custody-transfer precision with physical ticket printing, specify the <strong>CE-113<\/strong>. If you need localized depot reliability with zero electrical reliance, install the <strong>CE-110<\/strong>. <\/p>\n\n<p>Stop paying for uncalibrated fuel losses. Invest in precision mechanics, protect it with a good strainer, and let the meter pay for itself in three months.<\/p>\n\n<blockquote>\n<p>[!CTA]<\/p>\n<p><strong>Ready to lock down your fuel accountability?<\/strong><\/p>\n<p>Send us your flow rate, pump specifications, and line size. I&#039;ll personally review the parameters and recommend the exact PD meter configuration for your skid.<\/p>\n<p><a href=\"https:\/\/chintanengineers.in\/products\/fuel-flow-meter\/\">Browse Fuel Flow Meters<\/a> | <a href=\"\/contact-us\/\">Get a Technical Consultation<\/a><\/p>\n<\/blockquote>\n\n\n\n\n\n<\/div>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Can Positive Displacement meters handle biodiesel or ethanol blends?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. However, standard Buna-N seals will degrade with high ethanol or aggressive biodiesel blends. It is recommended to specify meters with Viton seals, such as the CE-113 or CE-105, which handle varying fuel chemistry without swelling or leaking.\"}},{\"@type\":\"Question\",\"name\":\"Why wouldn't I just use a cheap turbine meter for diesel?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Turbine meters suffer from 'slip' when fluid viscosity swings with temperature. As diesel thickens, it drags on the turbine blades, shifting the calibration curve. Positive displacement meters are mechanically immune to this slip profile, making them superior for high-accuracy diesel measurement.\"}},{\"@type\":\"Question\",\"name\":\"How often do I need to recalibrate a mechanical PD meter like the CE-110?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For internal accounting, verify the meter against a master prover can every 12 months. 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Pulse transmitters can often be fitted to the mechanical registers of units like the CE-113, allowing you to maintain localized mechanical totals while simultaneously feeding a PLC or batch controller.\"}}]}<\/script>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":50196,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"positive displacement flow meter vs coriolis","_yoast_wpseo_title":"PD vs Coriolis Flow Meter for Diesel Transfer","_yoast_wpseo_metadesc":"Compare Positive Displacement vs Coriolis meters for diesel. A Senior Engineer breaks down accuracy, Indian pricing, TCO, and OIML R117 compliance.","_yoast_wpseo_canonical":"","_eb_attr":"","_n8n_st_send_on_update":false,"_yoast_wpseo_keywordsynonyms":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-50198","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PD vs Coriolis Flow Meter for Diesel Transfer<\/title>\n<meta name=\"description\" content=\"Compare Positive Displacement vs Coriolis meters for diesel. 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