# Heat Treat Pyrometry (AMS2750) Readiness Checklist > Source: https://netray.co/tools/heat-treat-pyrometry-ams2750-readiness-checklist > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: Free Tools ## Short answer Self-check of furnace classification, instrumentation, system accuracy tests, temperature uniformity surveys and records before a customer or Nadcap audit. ## Category quality ## Industry Heat Treating ## Audience - Heat treat quality manager - Quality engineer - Furnace maintenance - Auditor ## Tool **Kind:** checklist **Groups:** #### Furnace classification and instrumentation **Items:** **Text:** Each furnace has a documented class and instrumentation type **Critical:** true **Text:** The class matches the most demanding specification it is used for **Critical:** true Furnace working zone dimensions are defined and recorded Control, recording and over-temperature sensors are identified per furnace Sensor locations and numbering are documented Recording instruments are in service and the chart or electronic record is retrievable Furnace identification is posted and matches the records #### Thermocouples and calibration **Items:** **Text:** Thermocouple types and wire grades are documented for each use **Critical:** true **Text:** Calibration is traceable to national standards **Critical:** true Calibration certificates are on file and reviewed for acceptance Instrument calibration due dates are tracked in one system Expired or out-of-tolerance sensors are tagged and removed Reuse limits for expendable thermocouples are defined and followed Correction factors are applied consistently where they are allowed #### System accuracy tests and uniformity surveys **Items:** **Text:** System accuracy test intervals are defined per furnace class and instrumentation type **Critical:** true **Text:** Temperature uniformity survey intervals are defined per furnace class **Critical:** true Test procedures are written and approved Test sensors are calibrated and used within their limits **Text:** Failed tests trigger documented containment and a reaction plan **Critical:** true Survey results are reviewed against the allowed uniformity range Load configurations tested are representative of production Next due dates are visible to the furnace operators #### Load records and traceability **Items:** **Text:** Every load has a record of furnace, cycle, date and operator **Critical:** true Load thermocouple use is recorded where the spec requires it **Text:** Records link to the lot or work order and the certificate **Critical:** true Out-of-range alarms are logged with disposition Quench delay and quench media records are kept where required Hardness or test results are linked to the load record Records are retained for the contract or specification period #### People and system controls **Items:** Operators are trained on pyrometry requirements and sign off Procedures reference the current revision of the specifications Customer flow-down requirements are logged by part number An internal audit of pyrometry records was done in the last 12 months Corrective actions from prior audits are closed with evidence Preventive maintenance covers burners, fans, seals and controllers **Scoring Note:** Mark each item when evidence exists, not when it is believed to exist. Items flagged as critical should be closed before an external audit. This checklist supports preparation and does not replace the governing specification or customer requirements. ## Content **Intro:** Pyrometry findings are among the most common reasons heat treat shops lose approvals. This checklist walks through furnace classification, calibration, system accuracy tests, temperature uniformity surveys and load records so you can find gaps before a customer or Nadcap audit does. **Sections:** #### How to use it **Body:** Work through each group furnace by furnace, with the actual records in front of you rather than from memory. Tick an item only when you can show the document, chart or certificate. Items marked critical are those that most often lead to major findings. Print the checklist or export it to Excel to assign owners and due dates for open items. Repeat before each audit and after any major furnace repair or control change. **Bullets:** - Check records, not recollection - Close critical items first - Assign an owner and date to each open item #### What the standard is about **Body:** AMS2750 is the aerospace pyrometry specification, and customers and Nadcap use it to judge heat treat process control. In outline it classifies furnaces by uniformity and instrumentation type, then sets how often system accuracy tests (SAT) and temperature uniformity surveys (TUS) must be done, how sensors must be calibrated, and which records must be kept. The exact classes, tolerances and intervals are in the current edition and in each customer spec, so use the standard itself for the numbers. This checklist only checks that you have a defined, documented and followed system. **Bullets:** - Furnace class and instrumentation type set the test intervals - SAT checks the control chain against a reference sensor - TUS maps temperature variation across the working zone #### Common findings and ERP angle **Body:** Typical audit findings include overdue tests, a furnace used for a job that needs a tighter class than it holds, missing correction factors, sensors reused beyond limits and load records that do not tie to the certificate. Many of these are scheduling and data problems. Put furnace due dates into the maintenance or calibration module so work orders cannot be released to an out-of-date furnace, and link the load record to the lot so the certificate pulls the real cycle data. **Bullets:** - Block scheduling on an overdue furnace test - Tie load records to lot and certificate - Track thermocouple reuse counts **Cta:** If your furnace due dates, load records and certificates are kept in separate places, we can help link them in your ERP or maintenance system so overdue tests block work. This checklist is free and needs no sign-up. **Faq:** #### What does AMS2750 cover? **Answer:** It is an aerospace specification for pyrometry in heat treatment. It covers furnace classes, instrumentation types, thermocouple calibration, system accuracy tests, temperature uniformity surveys and records. The current edition and customer flow-downs define exact tolerances and intervals. #### What is the difference between SAT and TUS? **Answer:** A system accuracy test compares the furnace control or recording sensor against a calibrated test sensor to check measurement error. A temperature uniformity survey places sensors across the working zone to measure how much temperature varies. Both have required intervals. #### Is this checklist enough to pass a Nadcap audit? **Answer:** No. It helps you prepare and find gaps. Passing depends on meeting the full specification, customer requirements and the audit criteria in force, plus having a working system with records that stand up to review. #### How often should I run this checklist? **Answer:** Run it before every external audit, after furnace repairs or controller changes, and at least once a year as part of internal audits. Some shops run it quarterly on the highest risk furnaces to catch overdue tests early. ## Search terms ams2750 checklist, pyrometry audit checklist, temperature uniformity survey checklist, system accuracy test checklist, nadcap heat treat audit preparation, furnace calibration checklist, heat treat furnace audit readiness, ams 2750 compliance checklist --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json