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Power Resistor - HS 700 WC
700W to 900W Chasis Mount, Water Cooled |
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| The HS700WC is most suitable where water cooling is available and space is limited. The withdrawal of heat, internally and externally ensures a low temperature gradient across the unit reducing internal stress. Heat is extracted internally through the cooling tubes and externally by direct mounting onto chasis or additional water cooled heatsink, thereby reducing temperature gradient across internal insulation. |
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| FEATURES: |
| 700 to 900W |
- Inductive or Non-Inductive Winding |
| Molded-In Insulated Cable Terminations |
- High Power For Small Size |
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| ELECTRICAL SPECIFICATIONS: |
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Power Rating on
Standard Heat
Sink at 25°C
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Resistance
Range
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Limiting
Element Voltage
DC/AC RMS
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Voltage Proof
AC Peak
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Stability  R %
Per 1000 Hrs
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Approx.
Weight
GMS
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Typ. Surface Temp.
Rise C/W Standard
Heat Sink Mounted
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Std. Heat Sink
(aluminum) RTH
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700 Watts
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R1 - 50K
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2200
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3000
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3%
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625
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0.19 C/W
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0.04 C/W
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Power Rating:
700 Watts mounted on 3750 cm2 x 3 mm aluminum plate with 25°C water flowing at rate of 2 litres per minute. See Curve 1
900 Watts mounted on water cooled heat sink of thermal resistance 0.04°C/W with water at 25°C flowing at rate of 4 litres/minute. See Curve 2 |
| TEMPERATURE RISE & POWER DISSIPATION |
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| Curve 1 |
Resistor mounted on standard air cooled heatsink with water at 25°C flowing at rate of 2 litres/minute |
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| Curve 2 |
Resistor mounted on water cooled heatsink of Rth 0.04°C/W with water at 25°C flowing at rate of 4 litres/minute |
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| CHARACTERISTICS |
| Tolerance |
1%, 5%, 10% |
| Temperature Coefficients Typ. Values |
Above 50R 25ppm/25°C. 1R-50R 50ppm/°C. Below 1R 100ppm/°C. For lower TC's please consult the factory. |
| Insulation Resistance (dry) |
10,000 M minimum |
| Power Dissipation at High Ambient Temp. |
Dissipation derates linearly to zero at 200°C |
| Non-Inductive |
Specify by adding N after style number max resistance 12k 5 ohms |
| Construction |
Water tube and resistor are encapsulated in an aluminum housing, ensuring good humidity seal and a high level of voltage protection. |
| Water Tubing |
Copper. Other materials available on request. |
| Core |
High alumina ceramic with high thermal conductivity and capable of withstanding severe thermal shock. The ground finish ensures maximum contact with the resistive element for rapid heat transfer. |
| Element |
Copper nickel alloy or nickel chrome alloy depending on ohmic value. |
| End Caps |
Stainless steel |
| Encapsulant |
High temperature molding compound. |
| Housing |
Anodized aluminum |
| Terminals |
Insulated flexible cable. Maximum length 610mm each end. |
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| DIMENSIONS (MM) |
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Tubing:
Standard water tubing 12.7 OD in copper. For alternative pipe material and connection arrangements please consult factory.
Lead: PTFE insulated flexible lead - BICC type 19/0.45. Type C to BS G 210
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| ORDERING INFORMATION |
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| Example: 10 ohm 5% |
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HS700WC
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10R0
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J
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Style No.
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Resistance
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Tolerance
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For non-inductive add letter N after HS
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<100 use R for decimal. >100
4th digit is multiplier
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F = 1%
J = 5%
K = 10%
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Micro Ohm will be pleased to advise and to provide further information on the following subjects.
- HS resistors for pulse applications
- Maximum overload
- Inductance values
- Low ohmic values
- Special terminations
- Alternative aluminum housing designs and mountings |
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