Product Overview

DWYER INSTRUMENTS, INC. | dwyer-inst.com88
Single Pressure Switches
PRESSURE
BOURDON TUBE PRESSURE SWITCH
Pressure Ranges to 8000 psi (551.6 bar)
8 [203.20]
3-1/2
[88.90]
3-1/2
[88.90]
10
[253.92]
3-7/8
[98.43]
1-3/4
[44.45]
5-3/8
[134.97]
2-3/4
[69.08]
1-1/4
[30.40]
5/8
[15.82]
7
[177.80]
8
[201.79]
1-5/8
[41.91]
3-5/8
[92.27]
2-7/8
[71.63]
REAR MOUNTING
FLANGE [3] .203 [5.16]
DIA HOLES AT 120° ON
6-1/2 [165.1] DIA. BOLT CIRCLE
1/2˝
CONDUIT
HUB
1
[26.39]
ADJUSTMENTS
GASKETED
COVER
1/4
NPT
1/2
NPT
3/4 PIPE THD.
CONDUIT HOLE
7-3/4 [196.9]
[2] STD.
Ø13/32
MOUNTING
HOLES
Ø6-1/64
[152.8]
2-1/4
[57.15]
7/8
[22.23]
1/4 NPT
1/2˝ CONDUIT HOLE
1-5/8
[41.28]
5/8
[15.88]
ADJUSTMENT
SCREWS
GASKET
CONTROL
ADJUSTMENTS
"U"
"L"
3/4
CONDUIT
TH'D
Customers tell us that the Series DA/DS Bourdon Tube Pressure Switch is the
best pressure switch made. The Mercoid DA/DS Series is one of the world’s broadest
lines of pressure switches. The DA/DS Series has extremely high sensitivity and
great repeatability. The DA Models are equipped with two external adjustments, one
for setting high pressure operating point, the other for setting low pressure operating
point. Deadband, the difference between high and low setpoints, is adjustable over the
full-scale. The DS Models are equipped with a single external adjustment for setting
operating point only. For mercury-free switches, choose between the snap action
switch or hermetically sealed snap action switch. Hermetically sealed mercury switch
also available.
FEATURES/BENEFITS
• Visible calibrated dial provides an easy and fast check without having to open device
causing dangerous conditions to operators
• On/off indication (except hermetically sealed snap switch models) gives operator
clear indication of state of switched equipment that could be located in another
location
• Adjustableorxeddeadbandsupportscontrolapplicationsbyreducingequipment
wear-out by unnecessary recycling
• External switch set point adjustment reduces set-up time
• Pressure ranges of full vacuum to 8000 psig gives application designers the ability to
specify standard equipment, simplifying install and training, and reducing servicing
costs
• UL listed, CSA approved, many models FM approved to support rigorous process
applications and regulations
• General purpose, weatherproof or explosion-proof enclosures for a variety of indoor
or outdoor environments meeting the needs of multiple applications and uses
APPLICATIONS
• Compressors
• Mechanical HVAC or process equipment
• Pump control
SPECIFICATIONS
Wetted Materials: Brass, 403 SS, or 316 SS.
Temperature Limit: 180°F (82°C).
Pressure Limit: Maximum pressure of the operating range.
Enclosure Rating: General purpose, weatherproof or explosion-proof.
Repeatability: ±1% of full operating range, ±1.5% on DS-7300 models.
Switch Type: SPST mercury switch, SPDT mercury switch, SPDT snap switch, or
SPDT hermetically sealed snap switch. Other circuit types available.
Electrical Rating: See model charts.
Electrical Connections: Screw terminal.
Conduit Connection: Generalpurpose:1/2˝holeforconduithub;Weatherproof:
1/2˝conduithub;Explosion-proof:3/4˝femaleNPT.
Process Connection: Generalpurposeandweatherproof:1/4˝maleNPT,1/2˝
maleNPTonranges15Sand16S;Explosion-proof:1/2˝maleNPTand1/4˝female
NPT.
Mounting Orientation: Vertical.
Set Point Adjustment: Thumbscrew.
Weight: Generalpurpose:4lb(1.8kg);Weatherproof:6lb(2.7kg);Explosion-
proof: 8 lb (3.5 kg).
Deadband: See model chart.
Agency Approvals: CSA, FM, UL (mercury switch units are not CE approved)
(Consult factory for FM approved models).
DAH DAW
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SERIES DA/DS | MERCOID
®
BY DWYER
USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Pressure_2021.indb 88 7/15/20 8:19 AM