{"id":4241,"date":"2026-03-16T09:21:28","date_gmt":"2026-03-16T01:21:28","guid":{"rendered":"https:\/\/www.chuxin-smt.com\/heller-vs-btu-vs-rehm-vs-ersa-nitrogen-reflow-comparison\/"},"modified":"2026-03-16T09:21:28","modified_gmt":"2026-03-16T01:21:28","slug":"heller-vs-btu-vs-rehm-vs-ersa-nitrogen-reflow-comparison","status":"publish","type":"post","link":"https:\/\/www.chuxin-smt.com\/fr\/heller-vs-btu-vs-rehm-vs-ersa-nitrogen-reflow-comparison\/","title":{"rendered":"Heller vs BTU vs Rehm vs Kurtz Ersa: Nitrogen Reflow Ovens Compared for Oxidation Control, Yield, and Service (2026)"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773624086-image_1773623608-shpatyda.jpeg\" alt=\"Minimalist technical cover comparing nitrogen reflow ovens with oxygen ppm gauge and nitrogen flow efficiency icons\" class=\"wp-image-4239\" srcset=\"https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773624086-image_1773623608-shpatyda.jpeg 1536w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773624086-image_1773623608-shpatyda-300x200.jpeg 300w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773624086-image_1773623608-shpatyda-1024x683.jpeg 1024w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773624086-image_1773623608-shpatyda-768x512.jpeg 768w, https:\/\/www.chuxin-smt.com\/wp-content\/uploads\/2026\/03\/1773624086-image_1773623608-shpatyda-18x12.jpeg 18w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" title=\"Heller vs BTU vs Rehm vs Kurtz Ersa: Nitrogen Reflow Ovens Compared for Oxidation Control, Yield, and Service (2026) - S&amp;M Co.Ltd\" \/><\/figure>\n\n\n\n<p>When buyers put four global reflow brands side-by-side, the decisive question increasingly becomes simple to ask and hard to answer: Which system controls oxidation best at the lowest nitrogen cost\u2014without sacrificing yield or uptime? This comparison keeps oxidation control as the spine, then layers in yield\/voids and lifecycle service\/TCO so engineering teams and procurement can make a confident, evidence-led choice.<\/p>\n\n\n\n<p><strong>Disclosure &amp; evidence boundaries:<\/strong> This comparison is editorial and not sponsored by BTU, Heller, Rehm, or Kurtz Ersa. The publisher operates in the SMT equipment industry; any references to S&amp;M Co.Ltd products are provided as an optional alternative and should be treated as first\u2011party material.<\/p>\n\n\n\n<p>Where vendors do not publish measured O2 ppm curves, N2 flow\u2011at\u2011ppm pairs, \u0394T uniformity, or vacuum depth, this article does not infer missing numbers. Any quantitative claims are labeled as <em>vendor\u2011claimed<\/em> and linked to the primary source. For purchase decisions, require time\u2011series logs and acceptance\u2011test artifacts under your own board mass, belt speed, and maintenance condition.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">TL;DR \u2014 Quick verdict by scenario<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Sub\u2011100 ppm with aggressive void reduction: Prioritize vacuum\u2011capable systems (Rehm VisionXP+ Vacuum; Kurtz Ersa EXOS\/HOTFLOW with vacuum). Validate vacuum depth (mbar) and X\u2011ray void % tables before committing.<\/p><\/li><li><p>300\u2013800 ppm with low OpEx and idle savings: Shortlist BTU Pyramax with Wincon Energy Pilot for automated idle modes that cut energy (and related N2 use) during gaps; request O2\u2011stability logs.<\/p><\/li><li><p>Audit\u2011heavy builds (medical\/aerospace) needing robust traceability: Favor platforms with mature MES protocols and granular logging; verify your region\u2019s service coverage and spare\u2011parts SLAs.<\/p><\/li><li><p>High throughput with long heated length and dual\u2011lane options: Consider Kurtz Ersa HOTFLOW THREE 3\/26 or comparable long systems; confirm \u0394T at target belt speeds.<\/p><\/li>\n<\/ul>\n\n\n\n<p>No universal winner emerged from public, numeric ppm\/flow data (which vendors rarely publish). Expect to run RFIs and on\u2011site tests to secure O2\u2011ppm curves and N2\u2011flow\u2011at\u2011ppm pairs.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Key takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Oxidation control isn\u2019t just the lowest ppm number\u2014it\u2019s the ability to hold a stable ppm band through load transients with efficient nitrogen use and good sealing.<\/p><\/li><li><p>Public O2\u2011ppm curves and N2 flow-at\u2011ppm pairs are scarce. Build them into your RFI and factory acceptance tests.<\/p><\/li><li><p>Vacuum reduces voids but doesn\u2019t replace nitrogen for oxidation control; treat them as complementary levers.<\/p><\/li><li><p>Idle\/energy features (e.g., BTU\u2019s Energy Pilot) can materially lower OpEx during production gaps\u2014measure recovery time and ppm stability.<\/p><\/li><li><p>Flux management (pyrolysis\/condensation) stabilizes sensors and heat exchangers, indirectly supporting ppm stability and OEE.<\/p><\/li><li><p>Compare service where you operate\u2014response SLAs and parts stocking drive uptime and total cost of ownership.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">2026 nitrogen reflow oven comparison table \u2014 oxidation, yield, service<\/h2>\n\n\n\n<p>Two important notes before the table: (1) Fields labeled \u201cvendor\u2011claimed\u201d reflect official pages\/brochures; (2) Most brands don\u2019t publish measured O2 ppm or N2 flow figures\u2014treat those rows as RFI targets.<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col \/><col \/><col \/><col \/><col \/><col \/><col \/><col \/><col \/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p>Model \/ Vendor<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Zones \/ heated length<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Claimed O2 target (ppm)<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Measured O2 (ppm)<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>N2 features \/ efficiency<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Vacuum option<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Flux management<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Software \/ traceability<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Evidence link<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>BTU Pyramax series<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>6\/8\/10\/12 zones; multiple lengths<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Not published (official)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Not public<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Energy Pilot idle automation; Dynamic Gas Idle (vendor\u2011claimed)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Some variants\/line options<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Aqua Scrub upgrade; extraction\/condensation<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Wincon with CFX\/Hermes\/OPC\/REST\/MQTT; barcode recipes<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>BTU Pyramax\/Wincon<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Rehm VisionXP+ (Nitro\/Vacuum)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Multiple configs; XP+ family<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Not published (official)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Not public<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Energy\u2011optimized N2 operation (vendor\u2011claimed)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Vacuum variant available<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Pyrolysis + cold condensation (Vision family)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Industry 4.0 integrations (verify)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Rehm Vision series<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Kurtz Ersa HOTFLOW THREE (3\/16, 3\/20, 3\/26); EXOS 10\/26 (vacuum)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Up to 26 zones; long heated sections<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Not published (official)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Not public<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Up to 25% N2 reduction with SCPU (vendor\u2011claimed)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>EXOS vacuum; HOTFLOW with options<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>SMART PYROLYSIS CLEANER; SMART ELEMENTS<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>CONNECT digital services (verify MES list)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ersa HOTFLOW THREE<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p>Heller HOTFLOW MK5\/MK7<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>5\u201312 zones; various widths<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Not published (official)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Not public<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Low\u2011N2 operation (vendor\u2011claimed)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Options vary by model<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Enhanced flux collection (vendor\u2011claimed)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Process control UI (verify MES list)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Heller HOTFLOW<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p>Evidence notes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>BTU Energy Pilot savings: Sleep modes can save &gt;25% energy during short gaps and &gt;40% for longer ones\u2014official vendor description in Wincon materials (2025\u20132026) (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.btu.com\/wincon-control-system\/\">BTU Wincon Energy Pilot<\/a>).<\/p><\/li><li><p>Ersa nitrogen reduction \u201cup to 25%\u201d is vendor\u2011quantified in a reflow overview PDF (no ppm\/flow pairs) (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/kurtzersa.com\/fileadmin\/user_upload\/download\/Ersa-Reflow-Overview-en.pdf\">Ersa reflow overview<\/a>).<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Oxidation control: how ppm targets, sealing, and nitrogen flow interact<\/h2>\n\n\n\n<p>Think of oxygen ppm like speed limits for oxidation. Lower ppm typically improves wetting and mitigates defects, but the real test is stability: can the oven maintain your target band when you load five heavy panels back\u2011to\u2011back or open a door?<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>PPM bands and outcomes<\/p><ul><li><p>&lt;100 ppm: often targeted for power modules or high\u2011reliability joints combined with vacuum to reduce voids.<\/p><\/li><li><p>300\u2013800 ppm: common for high\u2011mix EMS seeking a strong balance of solder quality and operating cost.<\/p><\/li><li><p>~1000 ppm and above: transitional; benefits versus air diminish, and flux chemistry dominates.<\/p><\/li><\/ul><\/li><li><p>What actually drives stability<\/p><ul><li><p>Zone sealing and leak paths across tunnel gaps and coolers.<\/p><\/li><li><p>Exhaust design and flux management: residue buildup raises backpressure, destabilizing ppm and \u0394T.<\/p><\/li><li><p>Control strategy: gas idle, purge routines, and recovery ramps after interruptions.<\/p><\/li><\/ul><\/li><li><p>What to measure before you buy<\/p><ul><li><p>Log zone\u2011by\u2011zone O2 with an inline analyzer while you run production boards at target speed. Capture steady\u2011state ppm and the ppm time\u2011series during a multi\u2011panel load and a brief door open.<\/p><\/li><li><p>Record N2 flow (L\/min or Nm\u00b3\/h) needed to hold your ppm band. This is your true nitrogen efficiency.<\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<p>For background on typical flow ranges and target bands, see a practical explainer on nitrogen usage and oxygen targets in reflow soldering that outlines how flow and ppm relate in production environments: <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/fr\/nitrogen-usage-in-reflow-oven-how-much-nitrogen-is-needed\/\">nitrogen usage vs oxygen targets<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Yield and voids: why vacuum complements, not replaces, nitrogen<\/h2>\n\n\n\n<p>Vacuum stages reduce entrapped gases after peak, cutting voids in power packages and large thermal pads. Vendors frequently promote large reductions\u2014Kurtz Ersa, for example, states voids can be reduced \u201cup to 99%\u201d on its EXOS 10\/26 (vendor\u2011claimed) (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/kurtzersa.com\/products\/electronics-production\/soldering-machines\/reflow-soldering-systems\/exos-10-26\">Ersa EXOS 10\/26<\/a>). Treat these as starting points, not guarantees.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>What to request<\/p><ul><li><p>X\u2011ray void % tables (per IPC\u20117095\/7093) before\/after vacuum, including sample size and cycle\u2011time impact.<\/p><\/li><li><p>Profile overlays showing vacuum timing relative to liquidus; verify there\u2019s no adverse thermal or flux side effect.<\/p><\/li><\/ul><\/li><li><p>Why nitrogen still matters<\/p><ul><li><p>Vacuum tackles voids; nitrogen suppresses oxidation that drives wetting issues, solder balling, bridging, and tombstoning. In practice, best FPY comes from the right ppm band plus good profiling\u2014with vacuum as an additional lever where packages demand it.<\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<p>For a primer on where vacuum reflow fits in SMT lines, see this overview: <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/fr\/why-is-vacuum-reflow-oven-so-essential-in-smt-lines\/\">why vacuum reflow is essential in some lines<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Service and TCO: idle modes, nitrogen cost, and what drives uptime<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Idle and recovery<\/p><ul><li><p>BTU\u2019s Wincon Energy Pilot automates sleep modes and coordination with upstream\/downstream equipment to cut energy during gaps while minimizing recovery time (vendor documentation, 2025\u20132026) (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.btu.com\/wincon-control-system\/\">BTU Wincon<\/a>). Ask vendors to quantify ppm and temperature recovery after a 3\u20135 minute pause.<\/p><\/li><\/ul><\/li><li><p>Estimating nitrogen cost per 1,000 boards (simple model)<\/p><ul><li><p>Inputs: N2 price ($\/Nm\u00b3), average flow (Nm\u00b3\/h), boards per hour.<\/p><\/li><li><p>Cost\/1,000 boards \u2248 (Flow \u00d7 Price \u00f7 Boards\/hr) \u00d7 1,000.<\/p><\/li><li><p>Example: 30 Nm\u00b3\/h at $0.12\/Nm\u00b3 and 50 boards\/hr \u2192 \u2248 $72 per 1,000 boards. Use your quoted gas pricing; actuals vary.<\/p><\/li><\/ul><\/li><li><p>Flux management and uptime<\/p><ul><li><p>Effective pyrolysis\/condensation extends maintenance intervals and keeps sensors\/heat exchangers cleaner\u2014supporting ppm stability and OEE. Rehm emphasizes integrated flux systems in its Vision family materials (vendor\u2011claimed) (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.rehm-group.com\/en\/processes\/convection-soldering\/visionxc-1.html\">Rehm VisionXC process page<\/a>).<\/p><\/li><\/ul><\/li><li><p>What to include in RFIs\/RFPs (compact checklist)<\/p><ul><li><p>O2 time\u2011series (steady and multi\u2011panel load), plus N2 flow at target ppm.<\/p><\/li><li><p>\u0394T across board at specified belt speed and mass (6\u201312 TC profile).<\/p><\/li><li><p>Vacuum specs (mbar) and X\u2011ray void tables with sample size and IPC method.<\/p><\/li><li><p>Flux\u2011residue handling (pyrolysis\/condensation) and maintenance intervals.<\/p><\/li><li><p>Service coverage in your regions, response times, parts stocking, first\u2011time fix rate.<\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Brand capsules (parity format)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">BTU Pyramax series<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Specs snapshot: 6\/8\/10\/12 zones; nitrogen or air; accessories include Aqua Scrub; Wincon control suite with Energy Pilot and Connected Factory options (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.btu.com\/reflow-ovens\/pyramax\/\">BTU Pyramax<\/a>).<\/p><\/li><li><p>Strengths (vendor\u2011claimed + visible features): Mature controls, strong connectivity (CFX, Hermes, OPC, REST, MQTT), automated idle modes to cut energy\/gas during gaps.<\/p><\/li><li><p>Constraints: No published O2 ppm or N2 flow numbers on official pages; \u0394T specs not public.<\/p><\/li><li><p>Best for: High\u2011mix EMS aiming at 300\u2013800 ppm bands with emphasis on idle savings and MES connectivity; request ppm stability logs.<\/p><\/li><li><p>Evidence: See BTU Wincon pages for Energy Pilot savings percentages (2025\u20132026) (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.btu.com\/wincon-control-system\/energy-pilot\/\">Wincon Energy Pilot<\/a>).<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Rehm VisionXP+ (Nitro\/Vacuum)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Specs snapshot: VisionXP+ family with Nitro and Vacuum variants; emphasizes energy\u2011optimized design and integrated flux management; Industry 4.0 features (verify with datasheet) (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/www.rehm-group.com\/en\/vision.html\">Rehm Vision series<\/a>).<\/p><\/li><li><p>Strengths (vendor\u2011claimed): Strong flux management (pyrolysis + condensation) that supports cleanliness and stability; vacuum variant for void reduction.<\/p><\/li><li><p>Constraints: Public ppm\/flow numbers and \u0394T specs not available on accessed pages; obtain official datasheet for specifics.<\/p><\/li><li><p>Best for: Automotive power packages and reliability\u2011critical builds needing vacuum plus good residue handling; confirm ppm stability at your target band.<\/p><\/li><li><p>Evidence: Vision family pages and process pages on convection soldering and flux systems.<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Kurtz Ersa HOTFLOW THREE (3\/16, 3\/20, 3\/26); EXOS vacuum<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Specs snapshot: Up to 26 zones; optional vacuum via EXOS 10\/26; collateral references up to 25% nitrogen reduction via SCPU\u00ae and major void reduction with vacuum (vendor\u2011claimed) (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/kurtzersa.com\/products\/electronics-production\/soldering-machines\/reflow-soldering-systems\/hotflow-three\">HOTFLOW THREE<\/a>; <a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/kurtzersa.com\/products\/electronics-production\/soldering-machines\/reflow-soldering-systems\/exos-10-26\">EXOS 10\/26<\/a>).<\/p><\/li><li><p>Strengths (vendor\u2011claimed): Long heated length and dual\u2011track options for throughput; vacuum competence; digital service ecosystem.<\/p><\/li><li><p>Constraints: No public ppm\/flow or \u0394T specs on accessed materials; confirm MES protocol list and measured void data.<\/p><\/li><li><p>Best for: High\u2011throughput lines that may combine dual\u2011lane capability with vacuum for power packages.<\/p><\/li><li><p>Evidence: Ersa overview and product pages linked above.<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Heller HOTFLOW MK5\/MK7<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Specs snapshot: 5\u201312 zones; various widths; nitrogen\u2011capable; emphasis on thermal repeatability (official pages) (Heller HOTFLOW MK7).<\/p><\/li><li><p>Strengths (vendor\u2011claimed): Established market presence, repeatable profiles, low\u2011N2 operation claims.<\/p><\/li><li><p>Constraints: Current public pages reviewed did not publish ppm targets, flow numbers, \u0394T specs, or detailed MES protocol lists.<\/p><\/li><li><p>Best for: Teams that value Heller\u2019s installed base and support network; still request ppm logs, \u0394T profiles, and service specifics for your region.<\/p><\/li><li><p>Evidence: Heller MK5\/MK7 official pages.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">How to choose: a simple decision tree<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>If you need &lt;100 ppm O2 plus minimal voids on power packages \u2192 Evaluate Rehm VisionXP+ Vacuum or Kurtz Ersa EXOS\/HOTFLOW with vacuum; request vacuum depth (mbar), X\u2011ray void % tables, and ppm stability at your belt speed.<\/p><\/li><li><p>If your priority is 300\u2013800 ppm with the lowest nitrogen\/energy OpEx \u2192 Evaluate BTU Pyramax with Energy Pilot and any low\u2011N2 packages; ask for N2 flow vs ppm charts and recovery behavior after idle events.<\/p><\/li><li><p>If audit\u2011grade traceability and regional service matter most \u2192 Shortlist the vendors who can document MES protocol support and provide regional SLA\/parts coverage in writing.<\/p><\/li><li><p>If throughput dominates \u2192 Favor longer heated lengths and dual\u2011lane options (e.g., HOTFLOW THREE 3\/26) and require \u0394T measurements at your target speed and board mass.<\/p><\/li>\n<\/ul>\n\n\n\n<p>Also add these RFI artifacts to every vendor request: O2 curves (steady and 5\u2011board load), N2 flow at target ppm, \u0394T profiles, flux maintenance intervals, and service response metrics.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Copy\/paste RFI question set (for oxidation control &amp; N2 efficiency)<\/h3>\n\n\n\n<p>Use the questions below verbatim in your RFI\/RFP so every vendor answers in comparable units and test conditions.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Provide <strong>zone\u2011by\u2011zone O2 ppm time\u2011series logs<\/strong> (CSV preferred) for:<\/p><ul><li><p>steady state at our target profile, and<\/p><\/li><li><p>a scripted <strong>5\u2011board load transient<\/strong> (boards loaded back\u2011to\u2011back), and<\/p><\/li><li><p>a <strong>30\u201360 second door\u2011open event<\/strong> with recovery logged.<\/p><\/li><\/ul><\/li><li><p>For each run above, report <strong>N2 flow<\/strong> (L\/min or Nm\u00b3\/h), <strong>N2 purity<\/strong>, analyzer model, and analyzer calibration date.<\/p><\/li><li><p>Provide <strong>O2 ppm vs N2 flow<\/strong> data at a minimum of three flow points (e.g., low\/medium\/high) so we can build a flow\u2011to\u2011ppm curve.<\/p><\/li><li><p>Provide <strong>\u0394T uniformity<\/strong> data (max\u2013min \u00b0C) across a representative board using a 6\u201312 TC profile at the tested belt speed.<\/p><\/li><li><p>If vacuum is offered: provide vacuum depth (mbar), vacuum timing vs liquidus, and <strong>X\u2011ray void % tables<\/strong> (method + sample size).<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Scoring rubric (quick, weighted)<\/h3>\n\n\n\n<p>To make shortlisting auditable, score each platform on the same weighted criteria (0\u20135 each) and keep the evidence files.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>30% \u2014 O2 stability<\/strong> (ppm band hold + recovery after load\/door events)<\/p><\/li><li><p><strong>20% \u2014 N2 efficiency<\/strong> (flow required at target ppm + idle\/purge behavior)<\/p><\/li><li><p><strong>15% \u2014 Thermal uniformity<\/strong> (\u0394T at target speed and board mass)<\/p><\/li><li><p><strong>15% \u2014 Vacuum capability<\/strong> (if needed: mbar + void % results)<\/p><\/li><li><p><strong>10% \u2014 Uptime &amp; maintenance<\/strong> (flux management, access, interval evidence)<\/p><\/li><li><p><strong>10% \u2014 Service readiness<\/strong> (regional coverage, parts stocking, response terms)<\/p><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Tip: keep \u201cMeasured O2 (ppm)\u201d and \u201cN2 flow to achieve target\u201d as <em>must\u2011submit<\/em> evidence gates. If they can\u2019t provide them, treat the entry as provisional regardless of brand.<\/p><\/blockquote>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Also consider: S&amp;M VS\u20111003\u2011N for cost\u2011optimized N2 operation<\/h2>\n\n\n\n<p>S&amp;M Co.Ltd publishes first\u2011party guidance and product information that may be useful if you\u2019re also benchmarking mid\u2011range nitrogen operation alongside the \u201cbig four.\u201d Because this is first\u2011party material, treat the ranges below as <strong>indicative<\/strong> until you validate them with the same demo protocol and logs requested from every vendor.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Practical oxygen band focus: 300\u2013800 ppm is a common production target for high\u2011mix lines balancing solder quality and OpEx.<\/p><\/li><li><p>Reference points (first\u2011party): VS\u2011series materials describe typical nitrogen\u2011operation ranges and offer process background on how O2 ppm and flow interact.<\/p><\/li>\n<\/ul>\n\n\n\n<p>See: <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/fr\/products\/vs-1003-n\/\">S&amp;M VS\u20111003\u2011N<\/a> et <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/fr\/nitrogen-usage-in-reflow-oven-how-much-nitrogen-is-needed\/\">nitrogen usage vs oxygen targets<\/a>.<\/p>\n\n\n\n<p><strong>Evidence boundary:<\/strong> No cross\u2011vendor measured ppm\/flow comparisons are implied here; request O2 time\u2011series logs and flow\u2011at\u2011ppm pairs (plus any FPY\/void tables) before weighting this option in a shortlist.<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">A simple benchmark protocol you can run in a demo (FAT\/SAT)<\/h2>\n\n\n\n<p>Use this protocol to produce apples\u2011to\u2011apples oxidation\u2011control evidence across brands.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p><strong>Board &amp; load definition<\/strong>: document board size, copper weight, assembly density, and panel mass; run at your target belt speed.<\/p><\/li><li><p><strong>Three phases to log (minimum 20\u201330 minutes total):<\/strong><\/p><ol><li><p>steady state (no door opens),<\/p><\/li><li><p>scripted 5\u2011board load transient,<\/p><\/li><li><p>door\u2011open event (30\u201360 seconds) then recovery.<\/p><\/li><\/ol><\/li><li><p><strong>What to record (same units for all vendors):<\/strong><\/p><ul><li><p>zone\u2011by\u2011zone <strong>O2 ppm time series<\/strong><\/p><\/li><li><p><strong>N2 flow<\/strong> (L\/min or Nm\u00b3\/h) and N2 purity<\/p><\/li><li><p>belt speed, exhaust settings, and any gas\u2011idle\/purge logic<\/p><\/li><li><p>optional: temperature profile (6\u201312 TC) and \u0394T summary<\/p><\/li><\/ul><\/li><li><p><strong>Pass\/fail gates (set your own limits):<\/strong><\/p><ul><li><p>O2 returns to target band within X minutes after the door event<\/p><\/li><li><p>O2 overshoot\/undershoot during the 5\u2011board transient stays within Y ppm<\/p><\/li><li><p>N2 flow to hold the band is within your cost model<\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<p>This produces the two missing \u201chard proofs\u201d most brochures omit: <strong>ppm stability curves<\/strong> et <strong>flow\u2011at\u2011ppm pairs<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>What oxygen ppm do I really need?<\/p><ul><li><p>Power and reliability\u2011critical builds often target &lt;100 ppm; many high\u2011mix EMS lines succeed in the 300\u2013800 ppm band. The right answer depends on alloy, flux chemistry, and profile. Validate with O2 logs and FPY data. For context on ppm bands and gas flow, see this guide on <a target=\"_self\" rel=\"follow\" class=\"link\" href=\"https:\/\/www.chuxin-smt.com\/fr\/nitrogen-usage-in-reflow-oven-how-much-nitrogen-is-needed\/\">nitrogen usage and oxygen targets<\/a>.<\/p><\/li><\/ul><\/li><li><p>Does vacuum reflow replace nitrogen?<\/p><ul><li><p>No. Vacuum reduces voids after reflow peak; nitrogen suppresses oxidation throughout heating and reflow. They\u2019re complementary. Vendor claims like Ersa\u2019s \u201cup to 99%\u201d void reduction (vendor\u2011claimed) should be validated with X\u2011ray tables and IPC\u2011method reports (<a target=\"_blank\" rel=\"nofollow\" class=\"link\" href=\"https:\/\/kurtzersa.com\/products\/electronics-production\/soldering-machines\/reflow-soldering-systems\/exos-10-26\">Ersa EXOS 10\/26<\/a>).<\/p><\/li><\/ul><\/li><li><p>How can I estimate nitrogen cost per PCB?<\/p><ul><li><p>Use: Cost\/1,000 boards \u2248 (Flow Nm\u00b3\/h \u00d7 $\/Nm\u00b3 \u00f7 Boards\/hr) \u00d7 1,000. Replace with your actual gas pricing and measured flow at target ppm.<\/p><\/li><\/ul><\/li><li><p>What proves real oxidation control in a demo?<\/p><ul><li><p>A vendor\u2011run time\u2011series showing steady\u2011state ppm and ppm during a scripted multi\u2011panel load, paired with logged N2 flow at your target belt speed and profile. Without that, \u201clow ppm\u201d is just a promise.<\/p><\/li><\/ul><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">As\u2011of date, methods, and evidence transparency<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>As of March 16, 2026, official public pages for BTU, Heller, Rehm, and Kurtz Ersa rarely publish measured O2 ppm, N2 flow\u2011at\u2011ppm pairs, or \u0394T specs. Where numbers are quoted (e.g., BTU Energy Pilot savings; Ersa N2 reduction and void claims), they are explicitly labeled as vendor\u2011claimed and linked to the canonical sources.<\/p><\/li><li><p>Readers should treat oxidation\u2011control and N2\u2011efficiency judgments as provisional until they obtain O2\/flow logs under their own profile and board mass conditions.<\/p><\/li><li><p>External link density is intentionally limited; additional datasheets and logs should be requested directly from vendors.<\/p><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<p>Request these in your RFI today: O2 curves, N2 flow\u2011at\u2011ppm, \u0394T profiles, vacuum depth and void tables, and regional service SLAs. That\u2019s how you turn a brochure comparison into a purchasing decision grounded in data.<\/p>","protected":false},"excerpt":{"rendered":"<p>A 2026 comparison of Heller, BTU, Rehm and Kurtz Ersa nitrogen reflow ovens\u2014focused on oxidation control (O2 ppm), yield impacts, nitrogen efficiency and service\/TCO to aid purchase decisions.<\/p>","protected":false},"author":3,"featured_media":4240,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"categories":[53,1],"tags":[57,60],"class_list":["post-4241","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-information","category-company-news","tag-reflow-oven","tag-smt"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/posts\/4241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/comments?post=4241"}],"version-history":[{"count":0,"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/posts\/4241\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/media\/4240"}],"wp:attachment":[{"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/media?parent=4241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/categories?post=4241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chuxin-smt.com\/fr\/wp-json\/wp\/v2\/tags?post=4241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}