Mercoid Series
DA / DS Bourdon Tube Pressure Switches
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 Visible
setpoint, adjustable deadband, pressure ranges to
5000psi (UL, SA & FM)
Customers tell us that this is
the best pressure switch made. Our most popular, Model
DA combines extremely
high sensitivity and repeatability with easily adjustable
set and reset points through non-interactive external
adjustments. Visible calibrated dial for set points
and on/off indicator to indicate switch actuation are
included. Choose either high current snap-switch or
hermetically sealed contact mercury switch. The DS
Model has a fixed deadband.
DA Series is equipped with two external adjustments.
One sets high pressure operating point, the other sets
reset point. Deadband, or the difference between set
and reset points is adjustable over the full scale.
DS Series has a single external adjustment and fixed
deadband. Visible calibrated dial, on/off indication.
SPDT snap-action or sealed mercury switches. Minimum
deadband obtainable at any point in range. Pressure
Ranges vacuum to 5000 psig. U.L. and C.S.A. Listed.
Many models FM listed. DPDT
Snap Action switches are available. Larger Image
Note: See Other Mercoid Products
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| Related Product Links: |
| Download Product Brochure (PDF File) |
| See Models & Ranges |
| Select Operating
Range and Deadband |
| Select
Operating Requirement |
| Select
Enclosure |
| Dimensional
Enlargement |
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| Physical
Data |
| Max. temperature: 180°F. For higher
temperature media applications, a remote connection or
siphon (pigtail) should be used. |
| Pressure connection: 1/4" NPT.
(1/2" on range 15S). |
| Housing: pressed steel with transparent
cover. |
| Wiring connections: 3 screw type. |
| Wetted parts: same as Bourdon tube
material. |
| Weight: 4 lb. (std); 6 Ib. (wea-proof);
8 Ib. (exp-proof). |
| Max. Press.: Max. adjustment operating
range. |
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| Suggested
Specification |
| Pressure switch shall be Mercoid Series
DA operated by a (brass) (type 316 stainless steel) (type
403 stainless steel) Bourdon tube actuating a (mercury
switch) (snap-switch). Switch shall have deadband fixed
or adjustable up to a maximum of 100% of switch range.
Switch shall have calibrated dial and one or two pointers
indicating set and reset points. Switch shall have visible
on/off indication. Set points shall be adjustable without
removing switch cover or shutting down process. |
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| How to Order Mercoid
Series D Pressure Switches |
| Select
Operating Range and Deadband |
| Select
Operating Requirement |
| Select
Enclosure |
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The Mercoid Corporation
manufactures one of the world's broadest lines of fine pressure
switches. It is comprised of approximately 200 standard
models and literally hundreds of variations. Whatever your
application might be, it is most probable it can be fully
satisfied with a Mercoid Series D pressure switch.
Because it is impractical to assign specific catalog numbers
to such a diverse line, we have devised an ordering number
procedure which, in effect, permits you to "build"
or "design" your own standard pressure switch.
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| To help you do
this, we would like to acquaint you with some basic terminologies
and how they effect your ordering procedure: |
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| Operating
Ranges |
| Operation of the switch
is adjustable within certain limits. This is indicated by an
operating range number. DAW-33-2, Range No. 6 would mean adjustable
within 5-100 psig. Select Operating
Range and Deadband |
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| Operating
Requirements |
| D is the generic designation
for a series of Mercoid pressure switches. However since they
are available in a variety of functions, a second letter is
added to D to define the type of deadband and/or adjustment.
DA, for example, means a D pressure switch that is fully automatic
and has a double adjustment. Select
Operating Requirement |
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| Enclosures |
| A general purpose NEMA
1 enclosure is furnished as standard on all Series D pressure
switches. However watertight, weather-resistant, weatherproof,
and explosion-proof housings are optionally available. Adding
a third character indicates an optional housing. DAW would indicate
a DA switch with a watertight enclosure. Select
Enclosure |
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| Materials |
| Mercoid offers Bourdon
tubes constructed in a choice of brass, Type 403 stainless steel,
and Type 316 stainless steel. Material is designated as part
of the series number. A DAW-33 indicates a brass Bourdon tube. |
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| Switch
Type and Action |
| Mercoid pressure switches
are available with mercury or snap-action contacts which become
an integral part of the ordering number. However switching action
is designated by a circuit suffix number. For example, DAW-33-2
would indicate a SPST switch which opens upon an increase in
pressure. |
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| Electrical
Ratings |
| The electrical characteristics
of the switch are fixed by a code letter which is not necessary
to specify. The code letter simply defines electrical ratings
to assist you in selecting the proper switch for your application.
For example, Code H tells you the switch is rated at 5 amps
@120V AC. |
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| COMPLETE
EXAMPLE |
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2. |
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4. |
5. |
6. |
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DS
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H
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7231
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153
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RANGE
NO. 4
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- Indicates a Series D switch with a fixed deadband, fully
automatic, single adjustment.
- Indicates an optional Class I, Groups C and D explosion-proof
enclosure with switch an integral part of enclosure.
- Type number indicates snap-action contact, brass Bourdon
tube, and Code E electrical rating.
- Indicates switch action, in this case SPDT, one opens
as other closes.
- Indicates adjustable operating range of 1-35 psig.
- Options.
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