HVAC Low Pressure Switch

HVAC Low Pressure Switch

—-Bingo Sensor

1. HVAC Low pressure switch—-PS-LA3

Product Detail

HVAC Low Pressure Switch PS-LA3 is able to sense tiny pressure change and widely used to control the flue of aerator, to monitor fan and air conditioner. It is also suitable for overheating protection and frost protection in industrial cooling system. Due to its outstanding design, the set point can be adjusted visually.
Series No. PS-LA3
Medium Air, non-combustible and non-aggressive gasses
Max Operating Pressure 10 kPa 
Mounting position Diaphragm in any vertical plane
Degree of protection IP54 (with cover)
Operating Temperature  -40° C to 85° C
Contact Arrangement SPDT
Electrical Rating Resistance: Initial: <50 milliohms;
1.5A (0.4A) / 250V
Terminals 6.3 mm(0.25″) copper alloy
Connection 6.0mm Dia. for tube connection 
Approval UL,  CE, RoHS, REACH

2. HVAC Low Pressure Switch—-PS-LA1 for Furnace,water heate

Product Detail

HVAC Low Pressure Switch PS-LA1 switch is designed for using in the Heating, Ventilation, Air-conditioning (HVAC) industry, where safety and reliability are essential. This model switch has been proved to be a viable solution for gas-fired warmer, hot air furnace, water heater and other heating appliances.  Available in pressure, vacuum and differential models with fine silver or gold-platinum-silver alloy contacts, it is capable of sensing pressure as low as 0.05inches of water and switching current up to 5A resistive, 2.5A inductive.
Model  PS-LA1
Media  Air, natural gas
Operating Pressure Range  0.15″ W.C. to 34″ W.C.
Proof Pressure  100″ W.C. (3.6 PSI)
Operating Temperature  -40 ~ 85 (-40 H~185 H)
Contact Arrangement  SPST or SPDT
Electric Rating  Resistance: Initial: <50 milliohms
Current: 100mA minimum, 5A resistive maximum
(fine silver alloy contacts);
15mA minimum, 0.5A resistive maximum
(gold-platinum-silver alloy contacts);
Terminals  6.3 mm (0.25″) copper alloy
Connection  Inlet 0.25″ for tube connection
 Agency Approval  UL, CE

Types of Pressure Switch

 What Are the types of Pressure Switches

—-Bingo Sensor

Pressure switches are used in a variety of industries for many different applications. Although the uses vary by environment and function, the two major types of pressure switches are electromechanical and solid-state switches. Electromechanical pressures switches were the only type available for many years, but solid-state types are quickly gaining in popularity.

The Function of Pressure Switches

  • Pressure switches serve as warning devices in a system. When a change in pressure is detected by the switch, a safety warning is initiated, an alarm sounds or elements within the system are altered. The switches are designed to open, close or adjust an internal contact based on a previously programmed point or level of functioning.

Electromechanical Pressure Switches

  • This type of pressure switch has an electronic snap-action switch that is attached to a sensory element. These elements, regardless of their specific type, always respond to the pressure of the system, and the switch opens or closes the contacts based on the highs or lows detected by the differential switches. When the pressure is equal, the switch is stable.

Diaphragm Switches

These switches use a weld-sealed metal diaphragm which directly 
acts on a snap-action switch (see Figure 2). Operating characteristics:

  • Pressure up to 150 psi and vacuum
  • Accuracy to ±0.5%
  • Low cycle rates (less than 25 cycles/min)

Bourdon Tube Switches

As the name indicates, a weld-sealed bourdon tube is used to 
actuate the snap-action switch (see Figure 3). Operating characteristics:

  • Pressure from 50 to 18,000 psi
  • ±0.5% accuracy.
  • Low cycle rates (less than 25 cycles/min)

Diaphragm Piston (Dia-Seal Piston) Switches

An elastomeric diaphragm acting on a piston which in turn actuates 
the snap-action switch (see Figure 4). 
Operating characteristics:

  • Pressure from vacuum to 1600 psi.
  • ±2% accuracy.
  • 2.5 million cycles

Piston Switches

An O-ring sealed piston acts directly on the snap-action switch 
(see Figure 5). Operating characteristics:

  • Pressure to 12,000 psi
  • ±2% accuracy
  • 2.5 million cycles 

Solid-State Pressure Switches

  • These switches are fully programmable and have analog and digital features as well as digital displays and one or more switch points. They have numerous advantages over their electromechanical counterparts. The most notable advantage of solid-state pressure switches is the length of their operational life, which is around 100 million cycles. Other advantages are higher rates of accuracy, higher resistance to external shock and vibration, adaptability to wide ranging system pressures, a wide range of frequency response and dependable and enduring stability and durability.

Solid-state pressure switches provide a number of advantages 
over electromechanical switches, including:

  • Long cycle life
  • Improved accuracy to ±0.25%
  • High resistance to shock and vibration
  • The ability to handle a wide range of system pressures
  • Broad frequency response
  • Excellent long-term stabilityThe major advantage, however, lies in cycle life. Solid-state switches 
    routinely have an operational life of 100 million cycles.