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 adjust-
ments. 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 mod-
els have a fixed deadband.
NOTE: The DS7300 has no status indicator.
INSTALLATION
The switch may be mounted in any position. Select a loca-
tion recommended by equipment manufacturer. Where
excessive vibration occurs, mount the switch remotely,
using an appropriate remote connection and mounting
bracket. See accessories, below.
ACCESSORIES
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 rat-
ing.
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.
Series DA/DS-7000 Bourdon Tube Pressure Switches
Specifications - Installation and Operating Instructions
Bulletin IN-523
1/4 N.P.T.
6-1/64
[152.8]
DIA.
7/8 [22.23]
ADJUSTMENT SCREWS
2-1/4
[57.15]
1-5/8
[41.28]
1/2 [12.7]
CONDUIT HOLE
5/8 [15.88]
MERCOID
CONTROL
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 tem-
perature 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.
Mounting
Bracket
Remote
Connection
Pigtail
Siphon
Contact: Northeast Controls Incorporated
P.O. Box 275 - Upper Saddle River, New Jersey 07458
Tel: 201-327-7660 | Fax: 201-327-3242 | [email protected]
www.nciweb.net/dwyer
