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Message ID: 18     Entry time: Sat Nov 21 17:27:32 2009
Author: Frank 
Type: Misc 
Category: RefCav 
Subject: old Minco heaters 

found four old Minco heaters (model HR5494-106) (from 1995) .  This type with 106 Ohms is not in their system anymore.
But corresponding to their data the maximum current for this type of heater is about 7.5A. So driving this heater with 24V would give us 5.4W of heating power beeing well below the limit. Using the standard power supply for heating refcavs we can get even more power. Due to the age (14years!) the adhesive back is not sticky anymore so i will use aluminum tape for first tests.

Model
HR5494 
Silicone Rubber heater :
4.00" x 8.00"
(101.60 mm x 203.20 mm)
Heater Shape
Effective Area : 30.3 in2
(195.484 cm2)
 
Lead Gauge : AWG 24
 
Max. current : 7.5 Amps
 
Configure this model in Kapton
Application Information Actual Current : 0.21 Amps
Operating Temperature : °C   Heat Output at Volts
Resistance in Ohms
378 1.52 Watts 0.05 W/in2 (0.0078 W/cm2)
189 3.05 Watts 0.1 W/in2 (0.0155 W/cm2)
114 5.05 Watts 0.17 W/in2 (0.0264 W/cm2)
55.1 10.45 Watts 0.34 W/in2 (0.0527 W/cm2)
37.6 15.32 Watts 0.51 W/in2 (0.0791 W/cm2)
26.3 21.9 Watts 0.72 W/in2 (0.1116 W/cm2)
13.1 43.97 Watts 1.45 W/in2 (0.2248 W/cm2)
Leadwire Length
Units Inches    Centimeters
Up to 12" included in price. Over 12", up to 80" add $3.00
Heater Backing - Based on Operating Temperature (see above)
Type Temperature Maximum Allowable
Watt Density
A No Backing -45 to 235° C    
    Installation options for unbacked heaters
    #20 Stretch Tape -45 to 200° C   1545.3 W (51 W/in2)
    #6 RTV -45 to 235° C   887.4 W (29.3 W/in2)
    Factory Vulcanized -45 to 235° C   1656.4 W (54.7 W/in2)
B #12 PSA -45 to 177° C   1292.4 W (42.7 W/in2)
D 0.003" Aluminum Foil Backing -45 to 235° C    
E Foil with Acrylic PSA -45 to 150° C   1100.4 W (36.3 W/in2)
F Foil with #12 PSA -45 to 204° C   1100.4 W (36.3 W/in2)
UL Component Recognition
Check to have heater marked for UL component recognition
Part Number (as configured):   HR5494R114L12B
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