United Electronics 119 series Pressure Switch Type H119 Model 171

United Electronics 119 series Pressure Switch Type H119 Model 171

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GENERAL Pressure Types H119 and H119A controls are activated when a diaphragm sensor responds to a pressure change. This response, at a predetermined set point, actuates a SPDT or a DPDT snap acting switch, converting a pressure signal into an electrical signal. Control set point may be varied by turning the internal slotted adjustment screw bushing according to procedures outlined in this document. (See Adjustment Procedures-Pressure Models PART II) Temperature Types F119 and F119A (Bulb and Capillary) controls sense temperature variations with a liquid filled sensing bulb. Liquid expansion or contraction is hydraulically transmitted to a diaphragm which actuates a SPDT or a DPDT snap action switch at a predetermined set point, converting a temperature signal into an electrical signal. Set point is adjusted by turning the internal hex adjustment screw according to procedures outlined in this document. (See Adjustment Procedures-Temperature Models

Pressure Pressure controls may be mounted via two mounting slots for #10 screws in the enclosure or directly to a rigid pipe using the pressure connection. Low pressure units, models 520-535, are also available with an optional surface mounting bracket. Always use a wrench to tighten pressure connection to the pipe. To prevent damaging pressure sensor, use a backup wrench to hold the hex nut in place when surface mounting. Temperature Temperature controls must be surface mounted via #10 screw slots. For remote bulb temperature controls, fully immerse bulb and 6” of capillary in the control zone for most efficient control. Best control is usually obtained by placing the bulb close to the heating or cooling source in order to sense temperature fluctuations quickly. Be sure to locate bulb so that it will not be exposed to temperature beyond the instrument range limits.

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