From:
Info <info**At_Symbol_Here**ILPI.COM>
Subject:
Re: [DCHAS-L] Malfunctioning Hot Plates
Date:
Apr 17, 2025 15:15 UTC
Reply-To:
ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID:
<6F28A96F-3584-46FE-ACC1-0EC79825A64F**At_Symbol_Here**ilpi.com>
In-Reply-To:
<036e01dbaf7e$f94e7410$ebeb5c30$@verizon.net>
As an Ohaus distributor I’ll point out that Ohaus has a line of Next Generation Guardian™ hotplate/stirrers that, per their literature:
offer several unique features that make the hotplates amongst the safest in the industry. Ohaus' signature SafetyHeat™ allows the user to adjust the Set Temperature upper limit of the Top Plate, SafetyHeat™ [uses two independent safety controls to continuously] monitors the electronics and shuts off heating before an overtemperature condition occurs and the Run Dry Protection System shuts off heating and sounds alarms if a probe-controlled heating is running without the probe tip submersed in the heating medium. The Run Time Mode and optional Splash Shield provide increased safety. The SmartRate™ system accurately controls heating & stirring from fast and intensive to soft and precise.
See, for example, https://www.safetyemporium.com/h-e-g52hs
Best wishes,
Rob Toreki
LabLocks™ - The first device that can lock out standard laboratory ball valves: https://www.safetyemporium.com/07400
US-Made NIOSH and FDA-approved N95 respirators: https://www.safetyemporium.com/safety-items/respirators/
Safety Emporium - Laboratory and Safety Supplies https://www.SafetyEmporium.comesales**At_Symbol_Here**safetyemporium.com or toll-free: (866) 326-5412Fax: (856) 553-6154, PO Box 1003, Blackwood, NJ 08012
On Apr 17, 2025, at 5:56 AM, 000006c59248530b-dmarc-request**At_Symbol_Here**lists.princeton.edu <000006c59248530b-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> wrote:
This has been a growing problem as most hot plates today have all solid state components which have no true failsafe (failure) mode. In an effort to cut costs the quality of their components is also being reduced aggravating the frequency and risk of them failing.
See these articles for more information and discussion;
Richard Palluzi
Richard P Palluzi LLC
72 Summit Drive
Basking Ridge, NJ 07920
908-285-3782
Couple of years ago there were many reports about Runaway Hotplates. This link has an article about the issue and risk mitigation best practices. Catching up with runaway hot plates Recently, a researcher had two hotplates (IKA brand- see model below) failed. In this case the hot plates overheated a flask with solvent. Probe was inserted correctly and the setpoint was well below the boiling point of the mixture. Nothing was done differently than other times the plates were used. I'm not sure how old the units are.
Has anyone heard of IKA hot plates failing or overheating?
115V 50/60Hz, 620W
0-1100rpm
IKA WERKE
Probe
IKA ETS D4 fuzzy
Yamaira Gonzalez, Ph.D., ASP
