Heater Catalog - Watlow

Band/Barrel HeatersMineral Insulated (MI) Band HeatersApplications and Technical Data (Continued)• Review the Watt Density chart to ensure theapplication does not exceed the maximum wattdensity at operating temperature after applyingderating factors.• Locate clamping guideline for unit diameter, width andwatt density.• Description of guideline letters are at the bottom ofthe MI Band Clamping Matrix Application Guide.• Note: Upward arrows are up to and not includingspecified watt density. Downward arrows are greaterthan or equal to specified watt density.Watt Density–W/in 2MI Band Clamping Matrix Application GuideDia. 8 ≥ 10 10 ≥ 12 12 ≥ 14 14 ≥ 16 16 ≥ 18 18 ≥ 20 20 ≥ 22 22 ≥ 24 24 ≥ 26 26 ≥ 28Width1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)8075706560BAbove Recommended Watt DensitiesContact your Watlow Representative55B50B4540B B35B DD D D D D D30 AD D D D D D D25AA20A ACAC C C C C C15C C C C C C C100A = Clamp bars, expandable or one piece construction Width Clamp Points at Each GapB = Spring clamps, expandable or one piece construction ≥ 5 in. (127 mm) 3C = Spring clamps, at one gap, welded barrel nuts at other gap ≥ 3 in. (76 mm) 2D = Spring clamps, spring clamps at both gaps < 3 in. (76 mm) 1Note: 1 in. (25 mm) wide heaters use welded barrel nuts rather than clamp bars.4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)1 1 /2 to4 in.(38 to102mm)4 1 /2 to7 in.(114to 178mm)496 WATLOW ®