AMS2750D Standards Compliance with X-Series Recorders

Honeywell X-Series Recorder: Minitrend QX

Honeywell X-Series paperless recorders now have features that make it easier for users to comply with AMS2750D standards. If your process is subject to NADCAP audits, X-Series recorders can collect the data and produce survey reports to show that your temperature instrumentation is in compliance.

Two modes in the recorder address the AMD2750D specification. Process mode can be used to track calibration due dates and thermocouple usage conditions for the process equipment and alert the data.

Typically, this would be used on a recorder mounted on the process furnace. AMS2750 temperature uniformity mode (available only on the Multitrend SX) lets you use the recorder as a field test instrument to do a temperature uniformity survey, and create a data file used to generate required reports.

AMS2750D Process Mode

Process mode lets you track thermocouple usages based on thermocouple type, the number of times they are used, and the temperatures they see, to determine if they are still within the AMS2750D specified allowable uses. It will also track due dates for System Accuracy Tests (SAT), when the next temperature uniformity survey is due, and when the recorder is due for calibration.

Each item provides a five-day warning, through color-coded screen icons, before indicating an out-of-tolerance condition. AMS2750 Process Mode requires five credits to function, and is available on all three X-Series recorders.

AMS2750 process is used when the recorder is attached to the process in the role of a recording device. All Honeywell X-Series SX, QX and QXe paperless recorders can operate in the Process mode and can be used as process recorders to monitor process timers for calibration due dates and thermocouple usage set by the user.

Process mode adds some new status screens and timers to the recorder to help with AMS2750D compliance of the process, giving a countdown to SAT and TUS intervals as well as control thermocouple and instrument calibration.

AMS2750 process mode is available on all X-Series recorders, and requires five credits in the X-Series firmware credit system.

Countdown Timers

AMS2750 tools include individual countdown timers for System Accuracy Test (SAT), thermocouple uniformity survey (TUS), Control TC and Instrument calibration.

TUS and SAT countdown timers track the next date for survey/test, and displays this information on the AMS2750 process screen. The user is alerted when these timers are about to expire. The SAT timer is based on tables found in AMS2750D that are dependent on Furnace class, Instrument type and if it is a parts or raw material furnace.

The timer reset screen shows the next suggested date for SAT and TUS depending on Furnace class, material and instrumentation type, or provide a date one month in the future for Control TC or Instrument calibration. SAT, TUS, Control TC and Instrument Cal timers are separately implemented within a class, where there is one instance per group/furnace.

A timer provides a countdown to the next instrument calibration or control thermocouple calibration. This can be changed by selecting this button and changing the date using the on screen date selection. This will reset the next control thermocouple calibration date.

Thermocouple Usage Tracking

Thermocouple Usage Tracking is available with both TUS and Process options. It tracks thermocouple use within a recorder that’s being used as a process instrument, and displays the results as a status screen. This give an indication to when thermocouples need replacing, dependent on load cycles and other factors specified in AMS2750D.

AMS2750D Temperature Uniformity Survey Mode

A Temperature Uniformity Survey (TUS) is a key requirement for a NADCAP audit. It determines how well a furnace performs relative to its design — in particular, the uniformity of the temperature within the volume of the working area of the furnace compared to the programmed setpoint.

X-Series Temperature Uniformity Survey (TUS) mode allows a recorder to be set up as a testing device rather than an in-process recorder, to monitor and record the temperature uniformity of thermal processing equipment per AMS2750D. Plus, it monitors thermocouple usage and reports their status.

Another key factor in the heat treatment process is monitoring the number of times thermocouples have been used and the temperatures to which they’ve been exposed, to ensure they are accurate and reliable.

Unlike in Process mode, TUS mode lets you set up a survey with up to six survey setpoints, and can support up to 40 inputs. Survey data points are recorded every two minutes into a separated data file that is used by the TUS report generator to create a temperature survey report. Currently, the TUS capability works only on single zone thermal processing equipment.

TUS mode is available only on Minitrend QX and Multitrend SX recorders, and requires 10 credits in the X-Series firmware credit system.

AMS2750D Report Generation Software

The AMS2750D Report Generation Tool is a software application that produces reports from the results of the Multitrend SX data.

Report tool uses a special data file generated by the recorder, plus user-entered data related to the survey, furnace instrumentation and calibration information, to generate the survey report in Adobe PDF format. This document can then be printed and signed off by the appropriate person.

Contact Lesman sales at 800-953-7626 for further details on AMS2750D-compliant recorders, or read more online about Honeywell X-series advanced paperless recorders.