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E2E Engineer Discussion Forum » Medical Diagnostic Equipment a... » General Discussion » Re: flexible heaters

flexible heaters

Last post 02-02-2009, 11:40 AM by Vitreous Humor. 1 replies.
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  •  01-30-2009, 11:10 AM 1671

    flexible heaters

    Good Morning,

    This is Roberto Donno. I am a student of the University of Pisa. I am writing to You because I am very interested in MINCO products, particularly to the flexible heaters. The object of my study regards the creation of a thermo-stimulator prototype for biomedical use. The device function should be to heat/warm up, under control, a surface equivalent to 1-2cm2 of human skin. The temperature ranges from 10°C to 50°C. I would like to know which the more suitable heater for my study would be. I am looking for a heater that generates a temperature variation equivalent to 0.1°C when an electricity variation occurs. Please take in consideration the following example: The initial temperature of the surface is T1 (ex. 37°C). The aim is to provoke a temperature rise equivalent to 0.1°C by making use of the heater. Do You think that MINCO flexible heaters can be used to generate such a temperature rise? I would like to utilize a standard heater combined with a CT325 Miniature DC Controller”. Yet, I did not actually understand whether the CT325, apart from indicating the temperature of the surface where the standard heater/sensor is positioned, generates, when required, the temperature rise of the heater ifself as well. Thank You in advance for Your kind help and assistance.

    I am looking forward to receiving Your reply.

    With best regards, Roberto Donno

  •  02-02-2009, 11:40 AM 1673 in reply to 1671

    Re: flexible heaters

    Roberto,

    This is likely a case where a custom designed solution would be best, but this also has to be a solution that is practical given the likely budget and potential volume of the application.You will need to have a copper or aluminum plate near the dimensions of the heater in order to achieve thermal uniformity.
     
    The HK5572 R4.1 L12B (0.5 x 0.5in) and HK5578 R5.4 L12B are the smallest square catalog heaters in the 1-2cm2 range that Minco has available. These also have hi-TCR foil options for use with a CT198, which might be the most practical way to maintain the temperature.
     
    You will probably want a thermistor based temperature indicator which could detect 0.1C increments over the +10C to +50C range. The thermistor would need to be able to be mounted in the metal plate to ensure it is actually sensing the temperature you want rather than the heating element. You would need to adjust the CT198 setpoint until the thermistor indicator unit shows the temperature of interest has been reached.

    Minco would be limited to the supply of PSA-backed (catalog) heaters and the CT198 controller. You would need to provide copper plate; sensor; voltage source; voltmeter, ohmmeter, temp readout, etc.; and perform the temperature measurements to calibrate the system.

    Vitreous Humor
    "Eye can see clearly now..."
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