Grieve Corporation 1910-0 Installation Manual
Series 1900 Pressure Switch
41/64
[16.27]
1-19/32
[40.48]
2-11/32
[59.53]
Ø7/8 [22.23]
CONDUIT
CONNECTION
1-3/4 [44.45]
CLEARANCE
FOR COVER
REMOVAL
3
[76.20]
Ø3-1/2
[88.90]
60° TYP
1/8 FEMALE NPT
HIGH PRESS.
CONNECTION
1-5/16
[33.32]
TYP
2-7/16 [61.90]
2-9/32
[57.94]
1-7/8
[47.63]
(2) Ø3/16 [4.76]
MOUNTING HOLES
ON A 4-3/16 [106.36] B.C.
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
51/64
[20.24]
4 [101.6] SQ.
7/8
[22.23]
3/4
[19.05]
3/4 [19.05]
4-3/4
[120.65]
5-1/2
[139.7]
HIGH PRESS.
CONN. 1/8 N.P.T.
LOW PRESS.
CONN. 1/8 N.P.T.
2 [50.8]
3 [76.2]
(4) 5-16 [7.94] DIA.
MTG. HOLES
WEATHERPROOF ELECTRIC
CONNECTION HUB
1/2 NPT FEMALE
1-1/8
[28.58]
1-1/4 [31.75]
3/32
[2.38]
3 [76.2]
3-1/8 [79.38]
4-1/4
[107.95]
5-3/4
[146.05]
1/8 NPT HIGH PRESSURE CONN.
TAPPED FOR
1/2 ELECTRICAL
CONDUIT CONN.
1/16
[1.59]
1/8 NPT LOW
PRESSURE CONN.
4-5/16 [10.54]
5-13/32 [137.32]
1-1/16
[26.99]
2-3/4
[69.85]
4-1/4
[107.95]
5-3/4
[146.05]
Specifications - Installation and Operating Instructions
Bulletin E-56
Series 1910 pressure switch. All
pressure and electrical connections and set point adjustments are
on one side for easy installation.
Series 1910 switch with conduit
enclosure off. Shows electric
switch and set point adjustment
screw.
Advanced design and precision construction permit
these switches 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 use with air and non-combustible gases. Series
1900 switches are available with set points of 0.07 to 20
inches water column. Set point adjustment can be made
easily - before or after installation. Range screw is inside
conduit enclosure to help prevent tampering. For easy
mounting and access, pressure and electrical connections
and set point adjustment are located on one side. This permits installation in corners or spaces too small for other
switches.
SPECIAL MODELS & ACCESSORIES
Special close coupled street elbow for right angle pressure
connections. Can be installed on switch anytime. Zinc plated aluminum.
The Dwyer-engineered force-motion amplifier increases the leverage of diaphragm movement and results in a switch with excellent
sensitivity and repeatability.
SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Temperature Limits: -30 to 180°F (-34 to 82.2°C) (32°F for
non dry air).
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: 1lb. 4.5 oz. (581 g).
Agency Approvals: CE, UL, CSA, FM.
Weatherproof Housing
16 ga. steel enclosure with gasketed
cover (NEMA 4) for wet or oily conditions. Withstands 200 hour salt spray
test. Wt. 5 Ibs. (2.3 kg). Switch must be
factory installed. Change 1910 base
number to 1911 and add -WP suffix.
Example: 1911-1-WP.
Explosion-Proof Housing
Cast iron base with brass cover. Rated
Class I, Div. 1 & 2, Groups D; Class II,
Div. 1 & 2, Groups E,F,G; Class III and
NEMA 7, 9 NEMA 3. (7 lbs). Switch
must be factory installed. Change
model to 1911 and add -EXPL suffix.
Example: 1911-1-EXPL.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
SERIES 1910 SWITCHES — MODELS
OPERATING
RANGES, DEADBANDS
0.04
0.10
0.15
0.30
0.40
0.40
Approximate
Dead Band
Model
Number
1910-00
1910-0
1910-1
1910-5
1910-10
1910-20
Operating
Range,
Inches W.C.
0.07 to 0.15
0.15 to 0.55
0.40 to 1.6
1.40 to 5.5
3.0 to 11.75
4.0 to 20.0
At Min.
Set Point
Phone: 219/879-8000 www.dwyer-inst.com
At Max.
Set Point
0.04
0.10
0.16
0.30
0.40
0.50
INSTALLATION
1. Select a location that is free from excessive vibration, corrosive atmosphere and where the ambient temperature is
within the limits for these switches.
2. Mount standard switches with the diaphragm in a vertical
plane and with switch lettering and Dwyer nameplate in
an upright position. Some switches are position sensitive
and may not reset properly unless they are mounted with
the diaphragm vertical. (Special units can be furnished for
other than vertical mounting arrangements if required.)
3. Connect switch to source of pressure, vacuum or differential pressure. Metal tubing with 1/4˝ O.D. is recommended, but any tubing which will not restrict the air flow
can be used. Connect to the two 1/8˝ female NPT pressure ports as noted below:
• Differential pressures - connect pipes or tubes from
source of greater pressure to high pressure port
marked HI-PR and from source of lower pressure to
low pressure port marked LO-PR.
• Pressure only (above atmospheric) - connect tube from
source of pressure to high pressure port. The low pressure port is left open to atmosphere.
• Vacuum only (below atmospheric pressure) - connect
tube from source of vacuum to low pressure port. The
high pressure port is left open to atmosphere.
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 contacts 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 an application involves either of these factors,
the user may find it desirable to limit the switched current
to 10 amps or less in the interest of prolonging switch life.
OPERATION
Pressure acting on the power diaphragm rotates the amplifying lever, which in turn extends the range spring and rotates
the snap switch input lever. When the set point is reached, the
snap switch is actuated and the electrical contacts make or
break.
ADJUSTMENT
To change the set point, proceed as follows:
A. Remove the snap-on cover from the conduit enclosure by
loosening its retaining screw and pulling firmly at its bottom end. Turn the slotted adjustment screw at the top of
range spring housing clockwise to raise the set point
pressure and counter-clockwise to lower the set point.
B. The recommended procedure for calibrating or checking
calibration is to 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 the manometer of known
accuracy and appropriate range, and apply pressure
through the third tube. Make final approach to the set
point very slowly. Note that manometer and pressure
switch will have different response times due to different
internal volumes, lengths of tubing, fluid drainage etc. Be
certain the switch is checked in the position it will assume
in use, i.e. with diaphragm in a vertical plane and switch
lettering and Dwyer nameplate in an upright position.
C. For highly critical applications it is a good idea to check
the set point adjustment and reset it as necessary once or
twice in the first few months of operation. This will compensate for any change in initial tension which may occur
in the spring and diaphragm. For most applications this
change will not be significant and no resetting will be
required.
MAINTENANCE
Moving parts of these switches are sealed in and are permanently tamper proof. The single adjustment is that of the set
point. Care should be taken to keep the switch reasonably dry
and free from dust or dirt. No lubrication or unusual precautions are required for normal use.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
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