Bulletin IN-523
Contact: Northeast Controls Incorporated
P.O. Box 275 - Upper Saddle River, New Jersey 07458
Tel: 201-327-7660 | Fax: 201-327-3242 | sales@nciweb.net
www.nciweb.net/dwyer
Series DA/DS-7000 Bourdon Tube Pressure Switches
Specifications - Installation and Operating Instructions
2-1/4
[57.15]
6-1/64
[152.8]
DIA.
MERCOID
CONTROL
1/4 N.P.T.
ADJUSTMENT SCREWS
7/8 [22.23]
CONDUIT HOLE
5/8 [15.88]
1-5/8
[41.28]
1/2 [12.7]
Series DA/DS-7000 Bourdon Tube Pressure Switches
are SPDT snap-action switches that combine extremely
high sensitivity and repeatability with easily adjustable set
and reset points through non-interactive external adjustments. These switches have visible calibrated dials for set
points and on-off indicators to indicate switch actuation.
DA models are equipped with two external adjustments.
One sets the high pressure operating point; the other sets
the reset point. Deadband or the difference between set
and reset points is adjustable over the full scale. DS models have a fixed deadband.
NOTE: The DS7300 has no status indicator.
INSTALLATION
The switch may be mounted in any position. Select a location recommended by equipment manufacturer. Where
excessive vibration occurs, mount the switch remotely,
using an appropriate remote connection and mounting
bracket. See accessories, below.
ACCESSORIES
Mounting
Bracket
Remote
Connection
PHYSICAL DATA
Pressure Range: Models range from 0 to 30” Hg (0 to
762.5 mm/Hg) Vac. to 800 to 8000 psig (55.16 to 551.6
bar).
Maximum Temperature: 180°F (82°C). For higher temperature media applications, a remote connection or siphon
(pigtail) should be used.
Pressure Connections:1/4″ NPT standard;1/2″ NPT on
ranges 500 to 5000 psig and 800 to 8000 psig.
Housing: Pressed steel with transparent cover.
Wiring Connections: Three-screw type.
Wetted Parts: Same as Bourdon tube material (brass,
403SS or 316SS) on all ranges except 23K, 24K, and 9K,
which have carbon steel bottom connections.
Weight: 4 lb/1.8 kg (standard); 6 lb/2.7 kg (weatherproof);
8 lb/3.6 kg (explosion-proof)
Max. Pressure: Max. adjustment of operating range.
CAUTIONS:
Control movement must not be oiled. Do not overload.
Note electrical rating on name plate and be sure that total
current passing through the switch is within specified rating.
When testing a boiler or system, never exceed maximum
pressure rating on control or it may be seriously damaged.
Remove control if higher pressures are required.
Do not fail to use a siphon on steam where range is 35 lbs
(2413 mbar) or more.
Pigtail
Siphon
Bulletin IN-523
Page 2
GENERAL PURPOSE CONTROLS, TYPES DA, DL, DR, DS
Mount control in any position. Do not twist the case when
installing. Use a wrench on the square part of the control
connection. On controls with operating Range No. 15S (500
to 5000 psi (34.47 to 344.75 bar)) or Range No. 16S (800
to 8000 psi (55.16 to 551.6 bar)), be sure the special sealing nut (with Teflon®insert) is turned to the uppermost
threaded section of the1/2″ pressure connection. Apply a
flat open-end wrench to the flat side of the bottom pressure
connection when piping the control. After properly connecting the control, tighten the sealing nut to assure a leakproof connection.
HOLES FOR
FLANGE SCREWS
DA21
DA31
DA41
3
1/2 CONDUIT
CONNECTION
6-1/64 DIA.
DA22
1-1/2
1/4 NPT
NPT
1/4
[«\«1
DA32
DA42
1-1/8
General Purpose
Types DA, DS, DR, DL
WEATHER-RESISTANT (RAINTIGHT)
NEMA 2, 3, TYPES N3DAW, N3DRW, N3DSW
These switches are supplied with flanged case, bottom connection, for surface mounting.
WATERTIGHT AND WEATHERPROOF
NEMA 2, 3, 4, 5, TYPES DAW, DRW, DSW, C4DAW*,
C4DAW*, C5DSW*
These switches are supplied with flanged case, bottom connection, for surface mounting only.
*
Conforms to Canadian Standards Association requirements
REAR FLANGE MOUNTING HOLES (3)
7 DIA.
ADJUSTMENTS
GASKETED COVER
1/4 NPT
[\««1
2-13/16
1/2
CONDUIT
HUB
Weather-Proof
Types DAW, DSW, DRW
EXPLOSION-PROOF TYPES DAH, DRH, DSH
Mount with mounting lugs attached to control housing.
3-1/2
BREATHER
(OPTIONAL)
MOUNTING
HOLES (OPTIONAL)
13/32 DIA.
5
3/4 CONDUIT
CONNECTION
FLANGED CASE CONTROLS
Mount by means of the three holes in the flange. Note:
Series D7030 when used for steam with operating ranges of
35 psi (2.413 bar) or higher, must be siphoned to prevent
live steam entering the Bourdon tube. With high-pressure
steam exceeding 100 psi (6.895 bar), use a remote connection. (Note accessories on Page 1.)
Series D-7020 incorporate an orifice as standard in the
pressure connection to dampen surges or pulsations.
DA24
DA34
DA44
13/64
DIA.
6-1/2 DIA.
BACK
CONNECTION
DA23
DA33
DA43
BOTTOM CONNECTION
Flange for Surface Mounting
9-7/8
7-3/4
1/2 NPT
1/4 NPT
Explosion-Proof
Types DAH, DRH, DSH
WIRING
Wire in accordance with the National Electrical Code and
local regulations. For general purpose controls, use a short
piece of BX between the rigid conduit and the control so the
control will not be subjected to conduit expansion and contraction. Where the control is directly connected into the
load circuit, it should be connected into the hot side of the
line. Do not exceed electrical rating as stamped on the control nameplate. DS-7300 controls are equipped with a terminal block. Field connection should be made to terminal
block pole in common with required pole of the control’s
switch. The color code is:
Black - Common
Blue - ON Hi
Red - ON Lo
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