OHD5R-90B

Series:	OHD™ Thermal Guard
Part Status:	Active
Circuit:	SPST-NC
Switching Temperature:	194°F (90°C)
Reset Temperature:	176°F (80°C)
Current Rating - AC:	--
Current Rating - DC:	0.1A (30V)
Tolerance:	±9°F (±5°C)
Switching Cycles:	--
Termination Style:	PC Pins
Mounting Type:	Through Hole
Package / Case:	Module

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Introduction

The OHD5R-90B is a mechanical, temperature sensing device which combines a thermostatic switch, selector switch, and adjustment screw into one unit. It is designed to sense temperature changes and alter its component switches in order to provide temperature control with a high degree of accuracy. The OHD5R-90B is most commonly used in HVAC and appliances such as refrigerators and freezers. 

Theory of Operation

The OHD5R-90B works by using a temperature-sensitive element that reacts to changes in temperature. This element is usually made of metal and contains a small amount of liquid-filled mercury, which is encapsulated in a sealed chamber. When the temperature around the element changes, the amount of liquid-filled mercury inside the chamber will expand or contract, depending on the current temperature. This motion causes a plunger to move up and down, which in turn causes a selector switch to be triggered.The selector switch then activates a number of circuits, such as a refrigeration compressor, heating element, or an air conditioning unit. This feature allows the thermostat to control a wide range of temperatures with a great degree of accuracy.

Features and Benefits

The OHD5R-90B is highly accurate and reliable, and can be used in a number of different applications. It is equipped with a clear, easy-to-read temperature range display that can be set to different temperatures without the need for any tools.The OHD5R-90B can also be used in combination with other temperature devices, such as temperature sensors and thermostats, to provide more accurate temperature control and monitoring.For HVAC systems, the OHD5R-90B is ideal because it can be programmed to maintain a specific temperature range, allowing for precise temperature control and efficient energy usage. Additionally, the OHD5R-90B is well-suited for use in refrigerated food storage, as it can be programmed to maintain a consistent temperature and thus reduce the risk of food spoilage.

Conclusion

The OHD5R-90B is an effective, reliable mechanical temperature sensing device that can be used in a variety of applications. It offers precision temperature control and is easy to install and use. Additionally, it is well-suited for use in HVAC and refrigeration applications, providing efficient energy usage and valuable temperature control.

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