DWYER INSTRUMENTS 1950-10-2F Differential Pressure Switch, 3 to 11 Inch Range

Dwyer Instruments 1950-10-2F differential pressure switch actuates electric switches in HVAC equipment through air pressure. It is equipped with an integral explosion-proof & weatherproof housing for use in hazardous environments. This switch is very light in weight & compact in size compared to other explosion-proof or weather-proof switches having separate enclosures.

Features:

• Dwyer 1950-10-2F differential pressure switch has an explosion-proof housing to be used in Class I, Div I, Groups C & D, Class II, Groups E, F & G and Class III hazardous environments.
• It has NEMA rated enclosure that comes with a cover, a drain plug & an O-ring seal for all-weather applications.
• The set-point adjustment screw is positioned outside the housing of the unit for user convenience.
• It has an operating pressure ranging from 3 to 11 inches W.C. (water column) and provides an approximate deadband at 0.3 & 0.20 at minimum & maximum set-points, respectively.
• This single-pole double-throw (SPDT) switch can be easily connected to the electrical supply through the removable front cover.

Standards and Approvals:

• CE
• UL
• CSA
• FM
• NEMA 3, 7 & 9

Frequently Asked Questions:

Q. How to change the set point of this Dwyer 1950-10-2F pressure switch?

A.

• Remove the plastic cap.
• Then, turn the slotted adjustment screw clockwise at the top of the housing for raising the set point pressure.
• Turn the screw counterclockwise for lowering the set point.
• Replace the plastic cap after calibration and re-check the set point.

Q. What are the steps to follow during maintenance of this pressure switch?

A.

• Moving parts of this switch do not need regular maintenance or lubrication.
• The switch should be kept reasonably clean.
• The venting drain plug should be periodically rotated and returned to its original position to remove any deposits accumulated in switch applications having excessive condensation conditions.

Q. How to install this Dwyer 1950-10-2F pressure switch?

A.

• Select an appropriate location that is free from vibration and is within operating conditions.
• Install the switch with the diaphragm placed in a vertical plane while the switch lettering & nameplate are in an upright position.
• Connect the switch's two 1/8 inch female NPT pressure ports to the pressure source of normal, vacuum or differential pressure type using any tubing that does not restrict the airflow.
• A low-pressure source is connected with the low-pressure port & a high-pressure source is connected to the high-pressure port.
• Make electrical connections by removing the cover's three hex head screws and loosening the fourth captive screw to swing aside the cover. Connect the circuit contacts.
• The normally open contacts close and the normally closed contacts open when pressure increases beyond the set point.