Dwyer 1823-10/-20/-40/-5 LOW DIFFERENTIAL PRESSURE SWITCH 10 psig
15 A 1800 series
Set Points from 0.07" to 85" w.c. Repetitive Accuracy within 2%
Essential for industrial environments, the Series 1800 Low Differential Pressure Switch for general industrial service combines small size and low price
with 2% repeatability for all but the most demanding applications.
Set point adjustment inside the mounting stud permits mounting the
switch on one side of a wall or panel with adjustment easily
accessible on the opposite side. UL and CSA listed, and FM
approved.
FEATURES
- Compact size and repeatability provide a high-value switch for many
industrial applications
- Designed for panel and wall mounting to easily meet mounting
requirements in most industrial settings
- Pressure ranges from 0.07 in w.c. to 85 in w.c. make this switch
suitable for a wide range of applications
SPECIFICATIONS
| Service | Air and non-combustible, compatible gases |
| Wetted Materials | Consult factory |
| Temperature Limits | -30 to 180°F (-34 to 82.2°C); 1823-00: -20 to 180°F (-28.9 to
82.2°C). |
| Pressure Limits | 10 psig (68.95 kPa) continuous, 25 psig (172.4 kPa) surge. |
| Switch Type | Single-pole double-throw (SPDT). |
| Repeatability | ±2% |
| Electrical Rating | 15A @120-480 VAC, 60 Hz. |
| Process Connection | 1/8˝ female NPT |
DESCRIPTION
Essential for industrial environments, the Series 1800 Low
Differential Pressure Switch for General Industrial Service
combines small size and low price with 2% repeatability for all but
the most demanding applications. Set point adjustment inside the
mounting stud permits mounting the switch on one side of a wall or
panel with adjustment easily accessible on the opposite side. UL
and CSA listed, and FM approved.
APPLICATIONS
Process applications
• Mechanical equipment control
APPROVALS
ADJUSTMENT
1. If the switch has been factory preset, check the set-point
before placing in service to assure it has not shifted in transit.
2. If switching has not been preset or it is desired to change the
point, observe the following procedure:
a. To adjust the set point turn the slotted Adjustment Screw
clockwise to increase the set point and counterclockwise to
decrease the set point.
b. The following is a recommended procedure for calibrating or
checking calibration: Use a “T” assembly with three rubber tubing
leads, all as short as possible and the entire assembly offering
minimum flow restriction. Run one lead to the pressure switch,
another to a manometer of known accuracy and appropriate range, and
apply pressure through the third tube. Make final approach to the
set point slowly. Note the manometer and pressure switch will have
different response characteristics due to different internal
volumes, lengths of tubing, oil drainage, etc. Be certain switch is
checked in position it will assume in use, i.e. vertical,
horizontal, etc.
ACCESSORIES
MODEL CHART
INSTALLATION
1. Select a location free form excessive vibration and where oil or
water will not drip upon the switch. See special housings for
unusual conditions.
2. While not required, positioning the pressure connections down is
recommended. Mount the switch with the diaphragm in a vertical
plane. Switch with the diaphragm in a vertical plane. Switch must
be recalibrated for each change in operating position.
3. Connect switch to source of pressure differential. Metal tubing
with 1/4˝ O.D. is recommended but any tubing system which will not
restrict the air flow is satisfactory. Note that the low pressure
connection may be made to the 1/2˝ spud at the back of the switch
if desired. If so connected, drill 1/16˝ diameter holes in the
Spring Retainer flange and the head of Adjustment Screw to provide
opening to the switch interior and plug the other low pressure
connection.
4. Electrical connections to the standard single pole, double throw
snap switch are provided by means of screw terminals marked
“common”, “norm open”, and “norm closed”. The normally open
contacts close and the normally closed contact open when pressure
increases beyond the set point.
5. Switch loads should not exceed the maximum specified current
rating of 15 amps resistive. Switch capabilities decrease with high
load inductance or rapid cycle rates. Whenever and application
involves one or more of these factors, the user may find it
desirable to limit the switched current to 10 amps or less in the
interest of prolonged switch life.
