Description
The Dwyer Instruments 1638-5 is a 2 to 6-inch water column differential pressure switch. It serves as a monitor for variations in air pressure in different HVAC systems. The membrane used in the switch expands and contracts in response to changes in pressure that it detects. The HVAC equipment receives a signal from an electrical switch when the pressure differential reaches a predetermined point. The 1638-5 is frequently utilized in ventilation systems, ducting, and air handling units to help maintain appropriate air pressure and flow. It can, for example, guarantee that there is an adequate supply of air to the places that are defined, avoid the build-up of excessive pressure that could harm equipment, and set off alarms when the pressure falls below a safe level.
