Tubular Heaters In Small Packaging System Assures Food Freshness Problem: The Watlow salesman had a customer using a cast-in heater from a competitor for his food packaging machines. The inexpensive bimetal thermostat was mounted in the expensive, massive cast-in heater was producing poor heat control. Solution: Within a week, the salesman coordinated an alternative design to decrease costs without sacrificing quality. The alternative involved spot-welding the tubular heater to a flat metal mounting plate with no thermostat (open loop control). Tests revealed wattage requirements of: A 150 watt element in a machine operated in a cold area 50°F (10°C ambient) A 30 watt element in a machine operated in normal areas 70°F (20°C ambient) The resulting sealing machine can seal small food items (

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