---
title: Density Meter Reboots While connected to AutoFlex
description: Learn how to identify and resolve a known AutoFlex power supply issue that can cause S4 DDM density meters to reboot during temperature ramping. Includes symptoms, corrective action, and replacement part information.
---

[Skip to content](https://knowledge.rudolphresearch.com/density-meter-reboots-while-in-use#main-content)

English

Show submenu for translations

![RRA\_Logo\_For\_email.png\]](https://knowledge.rudolphresearch.com/hs-fs/hubfs/RRA_Logo_For_email.png?height=50&name=RRA_Logo_For_email.png)

Open main navigation

Close main navigation

- English
  
  Show submenu for translations
- [Go to rudolphresearch.com](https://rudolphresearch.com/)

[Go to rudolphresearch.com](https://rudolphresearch.com/)

 Hello. How can we help you?

- There are no suggestions because the search field is empty.

1. [Ask Professor Rudy](https://knowledge.rudolphresearch.com/?hsLang=en)
2. [Troubleshooting](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en)
3. [AutoFlex](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#autoflex)

# Density Meter Reboots While connected to AutoFlex

## What to Look for When This Issue Occurs with Automation

If the power supply is starting to degrade, during density or refractometer temperature changes, the density meter could start to reset continuously.  If this happens, you should either replace the power supply, the part number is below or have the density meter power come from a dedicated power supply separate from the AutoFlex system. 

If replacement parts are needed, please use the following:

- **P7816** – Power Cord (USA Version) – Qty 1
- **P29647** – External Power Supply, 24V – Qty 1

**Important:** This power supply is only compatible with **S4 DDM** instruments.

If you require additional information or assistance, please contact your distributor or reach out to Rudolph Research Analytical Technical Support. We will be happy to provide further guidance and support as needed.

 

 

 

- [Product Information](https://knowledge.rudolphresearch.com/product-information?hsLang=en#main-content)

    - [Autopol® Polarimeters](https://knowledge.rudolphresearch.com/product-information?hsLang=en#autopol-polarimeters)
    - [Density Meters](https://knowledge.rudolphresearch.com/product-information?hsLang=en#density-meters)
    - [Refractometers](https://knowledge.rudolphresearch.com/product-information?hsLang=en#refractometers)
- [Troubleshooting](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#main-content)

    - [Polarimeter](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#polarimeter)
    - [AutoFlex](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#autoflex)
    - [Density Meter](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#density-meter)
    - [Refractometer](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#refractometer)
    - [AlcoTest](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#alcotest)
    - [Data Backup/Audit Trail/ Historical Data](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#data-backup-audit-trail-historical-data)
    - [Pinter](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#pinter)
    - [Troubleshooting - Boot Up Issue](https://knowledge.rudolphresearch.com/troubleshooting?hsLang=en#troubleshooting-boot-up-issue)
- [How To](https://knowledge.rudolphresearch.com/how-to?hsLang=en#main-content)

    - [Density Meter](https://knowledge.rudolphresearch.com/how-to?hsLang=en#density-meter)
    - [Polarimeter](https://knowledge.rudolphresearch.com/how-to?hsLang=en#polarimeter)
    - [AlcoTest](https://knowledge.rudolphresearch.com/how-to?hsLang=en#alcotest)
    - [Automation](https://knowledge.rudolphresearch.com/how-to?hsLang=en#automation)
    - [Refractometer](https://knowledge.rudolphresearch.com/how-to?hsLang=en#refractometer)
    - [21CFR11](https://knowledge.rudolphresearch.com/how-to?hsLang=en#21cfr11)
    - [Minimum PC Specifications](https://knowledge.rudolphresearch.com/how-to?hsLang=en#minimum-pc-specifications)
    - [VeriLinkRx](https://knowledge.rudolphresearch.com/how-to?hsLang=en#verilinkrx)
- [FAQ](https://knowledge.rudolphresearch.com/faq?hsLang=en#main-content)

    - [Printers](https://knowledge.rudolphresearch.com/faq?hsLang=en#printers)
    - [Warranty Coverage](https://knowledge.rudolphresearch.com/faq?hsLang=en#warranty-coverage)
    - [VeriLink Rx](https://knowledge.rudolphresearch.com/faq?hsLang=en#verilink-rx)
    - [Audit Trail](https://knowledge.rudolphresearch.com/faq?hsLang=en#audit-trail)
    - [Ports & Connections](https://knowledge.rudolphresearch.com/faq?hsLang=en#ports-connections)
    - [Software/Upgrades](https://knowledge.rudolphresearch.com/faq?hsLang=en#software-upgrades)
    - [Sample Cell](https://knowledge.rudolphresearch.com/faq?hsLang=en#sample-cell)
    - [AlcoTest-RI](https://knowledge.rudolphresearch.com/faq?hsLang=en#alcotest-ri)
    - [Quartz Control Plate (QCP)](https://knowledge.rudolphresearch.com/faq?hsLang=en#quartz-control-plate-qcp)
    - [Octapol](https://knowledge.rudolphresearch.com/faq?hsLang=en#octapol)
    - [Density](https://knowledge.rudolphresearch.com/faq?hsLang=en#density)

[![RRA logo](https://knowledge.rudolphresearch.com/hs-fs/hubfs/RRA%20logo.webp?width=300&height=137&name=RRA%20logo.webp "RRA logo")](http://rudolphresearch.com)

Welcome to the Rudolph Research Knowledge Base

Copyright © 2026, https://rudolphresearch.com/