Manual

S
eries DA/DS-7000 Bourdon Tube Pressure Switches are SPDT snap-action
s
witches 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
SPECIFICATIONS
Wetted Materials: Brass, 403 SS, or 316 SS.
Temperature Limit: 180°F (82°C).
Pressure Limit: Maximum pressure of the operating range.
E
nclosure Rating: General purpose, weatherproof or explosion-proof.
R
epeatability: ±1% of full operating range.
Switch Type: See circuit chart.
Electrical Rating: See electrical ratings chart.
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 (2.7kg);
Explosion-proof: 8 lb (3.5 kg).
Deadband: See Ranges and Differentials Chart.
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 spec-
ified rating.
When testing a boiler or system, never exceed maximum pressure rating on con-
trol 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]
D
IA.
7/8 [22.23]
A
DJUSTMENT SCREWS
2-1/4
[57.15]
1
-5/8
[
41.28]
1
/2 [12.7]
C
ONDUIT HOLE
5/8 [15.88]
MERCOID
C
ONTROL
MERCOID DIVISION Phone: [phone] www.dwyer-inst.com
DWYER INSTRUMENTS, INC. Fax: [phone] e-mail: [e-mail]
P.O. BOX 258 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Mounting Bracket
33-25
Remote Connection
49-62: 6 ft copper - 300 psig max
49-62HP: 6 ft copper - 2500 psig max
49-210: 12 ft 316 SS - 3000 psig
Pigtail Siphon
42-52: 250 psig max
42-58: 2000 psig max