Series H3 Differential Pressure Switches
Bulletin E-78
Specifications - Installation and Operating Instructions
SPECIFICATIONS
Wetted Materials: See pressure chamber and diaphragm material in
model chart.
Temperature Limit: -4 to 220°F (-20 to 104°C), ATEX: -20 to 90°C (-4 to
194°F).
Pressure Limit: 1500 psig (103 bar).
Enclosure Rating: See ratings chart.
Switch Type: SPDT or DPDT snap switch.
Electrical Rating: 5A @ 125/250 VAC (V~), 30 VDC (V ). MV option:
1A @ 125 VAC (V~); 1A res., .5A ind. @ 30 VDC (V ).
Electrical Connections: See model chart.
Conduit Connection: 3/4˝ female NPT.
Process Connection: 1/8˝ female NPT.
Mounting Orientation: Vertical.
Set Point Adjustment: Internal screw.
Weight: 4 lb, 2 oz (2 kg).
Deadband: Approximately 5% of range.
H3 ___ – ___ ___ ___ – ___ ___
COVER SET
SCREW
COVER
3/4 NPT CONDUIT
CONN.
5-3/8
[136.53]
2-13/32
[61.12]
31/32
[24.61]
17/32
[13.5]
1-25/32
[
45.24]
3-9/16 [90.49]
4 [101.6]
[4.37] DIA. MOUNTING HOLES
IN MOUNTING BRACKET
OPTIONAL DRAIN
C PROCESS CONN.
Series H3 Differential Pressure Switches actuate one or two single
pole, double throw (SPDT) snap switches in response to increasing or
decreasing pressure of compatible gases or liquids. Four field adjustable
operating ranges are available allowing set-points up to 200 psid. All
models are suitable for hazardous locations and also include
weatherproof housings as detailed in the chart below. Read and
understand instructions completely before proceeding with installation or
operation.
MODEL NUMBER DEFINITIONS
1 2 3 4 5
1
Wetted Materials
A – Aluminum/Nitrile
S – 316 SS/Fluoroelastomer
Operating Range
1 – 10 to 180 in. w.c. (2.48 - 44.78 kPa)
2 – 0.5 to 15 psid (0.03 - 1 bar)
3 – 5 to 70 psid (0.34 - 4.8 bar)
4 – 10 to 200 psid (0.7 - 13.8 bar)
Circuit
S – SPDT
D – DPDT
Electrical Connections
C – Terminal block(s) ATEX Compliant Construction
T – Terminal block(s) UL and CSA approved
L – Wire leads
Options
MV – Gold contacts
DR – Drain/Breather
VIT – Fluoroelastomer diaphragm/O-ring option where not
standard.
2
3
4
5
HAZARDOUS LOCATION/WEATHERPROOF RATINGS
MODEL
H3 _ – _ _ C
H3 _ – _ _ L
H3 _ – _ _ T
H3 _ – _ _ C-DR
H3 _ – _ _ L-DR
UL
—
CI. I, Gr.B, C & D
CI. II, Gr.E, F & G
NEMA 4X
—
CI. I, Gr.B, C & D
CI. II, Gr.E, F & G
NEMA 3
CSA
—
CI. I, Gr.B, C & D
CI. II, Gr.E, F & G
NEMA 4
—
—
Directive 94/9/EC
ATEX Compliant
0344
II 2 G Ex d IIB
-20°C≤ T amb ≤ 75°C T6
EC-Type Certificate No.
KEMA 03ATEX 2584
IP56
—
0344
II 2 G Ex d IIB
-20°C≤ T amb ≤ 75°C T6
EC-Type Certificate No.
KEMA 03ATEX 2584
IP54
—
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Attention: Units without the “C” suffix are not Directive 94/9/EC (ATEX)
compliant. These units are not intended for use in potentially hazardous
atmospheres in the EU. These units may be CE marked for other Directives
of the EU.
1/8 NPT HIGH PRESSURE CONN.
1/8 NPT LOW PRESSURE CONN.
1-3/4
[
44.45]
3
[76.2]
(2 pages)
(8 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals