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Dwyer Series 1900 Compact Low Differential
Pressure Switches
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| Set Points from 0.07" to
20" w.c., Repetitive Accuracy within 3% |
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 Our
most popular series combines advanced design and precision construction
to make these switches able to perform many of the tasks of
larger, costlier units. Designed for air conditioning service,
they also serve many fluidics, refrigeration, oven and dryer
applications. For air and non-combustible compatible gases,
Series 1900 switches have set points from 0.07 to 20" w.c.
(1.8 to 508 mm). Set point adjustment is easy with range screw
located inside conduit enclosure. Internal location helps prevent
tampering. UL, CE and CSA listed, FM approved and ATEX pending.
See
Dimensions
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| SPECIAL MODELS AND ACCESSORIES |
| Manual Reset Model 1900 MR includes
special snap switch which latches on pressure increase above
the setpoint. Switch must be manually reset after pressure drops
below the setpoint. To order, change base model to 1900 and
add MR suffix after range number. Example: 1900-10-MR. Available
on -1, -5, -10, or -20 ranges only. Option is not UL, CSA or
FM listed. |
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| Weatherproof Housing |
| 16-ga. steel enclosure with gasketed
cover (NEMA 4) for wet or oily conditions. Withstands 200 hour
salt spray test. Wt. 5 lbs. (2.3 kg). Switch must be factory
installed. Change 1910 base number to 1911 and add -WP suffix.
Example: 1911-1-WP. |
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| SPECIFICATIONS |
Service: Air and non-combustible,
compatible gases.
Wetted Materials: Consult Factory.
Temperature Limits: -30 to 180°F (-34 to 82.2°C).
Pressure Limits: 45" w.c. (11.2 kPa) continuous, 10 psig
(68.95 kPa) surge.
Switch Type: Single-pole double-throw (SPDT).
Repeatability: ±3%.
Electrical Rating: 15 A @ 120-480 VAC, 60 Hz. Resistive 1/8
HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz. Derate to 10 A for operation
at high cycle rates.
Electrical Connections: 3 screw type, common, normally open
and normally closed.
Process Connections: 1/8" female NPT.
Mounting Orientation: Diaphragm in vertical position. Consult
factory for other position orientations.
Set Point Adjustment: Screw type inside conduit enclosure.
Weight: 1 lb 4.5 oz (581 g).
Agency Approvals: CE, UL, CSA, FM, ATEX pending. |
| CAUTION: FOR
USE ONLY WITH AIR OR COMPATIBLE GASES. |
| |
| SPECIAL MODELS AND ACCESSORIES |
| Manual Reset |
| Model 1900 MR includes special
snap switch which latches on pressure increase above the setpoint.
Switch must be manually reset after pressure drops below the
setpoint. To order, change base model to 1900 and add MR suffix
after range number. Example: 1900-10-MR. Available on -1, -5,
-10, or -20 ranges only. Option is not UL, CSA or FM listed. |
| |
| Weatherproof Housing |
| 16-ga. steel enclosure with gasketed
cover (NEMA 4) for wet or oily conditions. Withstands 200 hour
salt spray test. Wt. 5 lbs. (2.3 kg). Switch must be factory
installed. Change 1910 base number to 1911 and add -WP suffix.
Example: 1911-1-WP. See
Dimensions |
| |
| Explosion-proof Housing |
| Cast iron base with brass cover.
Rated Class I, Div. 1 & 2, Group D; Class II, Div. 1 &
2, Groups E, F, G; Class III, and NEMA 7, 9 NEMA 3. Wt. 7 lbs.
Switch must be factory installed. Change base model to 1911
and add -EXPL suffix. Example: 1911-1-EXPL |
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| ATEX (Approval Pending)
Housing |
 Model
1911-CN. Explosion-proof housing, EExd II B T6 IP6S. Change
base number to 1911 and add -CN suffix. Example: 1911-1-CN. |
| A-399 Duct Pressure Monitor
Kit |
| For use with standard or manual
reset model switches. Includes mounting flange, tubing and adaptors. |
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| A-329 Street Ell |
| Brass adapter for applications
requiring right angle connections. Two required for differential
pressure. |
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| OPTIONS -- Consult Factory
for Pricing |
WP Weatherproof
Housing.
EXPL Explosion-proof Housing.
CN ATEX (Approval Pending) Housing. |
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| Popular Models |
| Model Number |
Operating
Range, Inches W.C. |
Approx.
Dead Band At Min. Set Point |
App.
Dead Band At Max. Set Point |
| 1910-00 |
0.07
to 0.15 |
0.04
min |
0.04
max |
| 1910-0 |
0.15
to 0.55 |
0.10
min |
0.10
max |
| 1910-1 |
0.40
to 1.6 |
0.15
min |
0.16
max |
| 1910-5 |
1.40
to 5.5 |
0.30
min |
0.30
max |
| 1910-10 |
3.0
to 11.75 |
0.40
min |
0.40
max |
| 1910-20 |
4.0
to 20.0 |
0.40
min |
0.50
max |
|
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| Accessories |
| Model
Number |
Description |
| A-399 |
Duct
Pressure Monitor Kit, for use with standard or manual
reset model switches. |
| A-329 |
1/8"
NPT Close Coupled Street Ell, brass. |
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