Dwyer Instruments DA,DS Operating Manual
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
[
41.2 8]
1
/2 [12.7]
C
ONDUIT HOLE
5/8 [15.88]
MERCOID
C
ONTROL
Series DA/DS-7000 Bourdon Tube Pressure Switches
Specifications - Installation and Operating Instructions
eries DA/DS-7000 Bourdon Tube Pressure Switches are SPDT snap-action
S
witches that combine extremely high sensitivity and repeatability with easily
s
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
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
SPECIFICATIONS
Wetted Materials: Brass, 403 SS, or 316 SS.
Temperature Limit: 180°F (82°C).
Pressure Limit: Maximum pressure of the operating range.
nclosure Rating: General purpose, weatherproof or explosion-proof.
E
epeatability: ±1% of full operating range.
R
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 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
42-52: 250 psig max
42-58: 2000 psig max
MERCOID DIVISION
DWYER INSTRUMENTS, INC. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
P.O. BOX 258 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
GENERAL PURPOSE CONTROLS, TYPES DA, DL, DR, DS
M
OUNTING
HOLES (OPTIONAL)
1/29 NPT
9-7/89
BREATHER
(OPTIONAL)
59
3
/49 CONDUIT
CONNECTION
13/329 DIA.
1/49 NPT
7-3/49
3-1/29
6-1/29 DIA.
13/649
DIA.
BACK
CONNECTION
BOTTOM CONNECTION
DA24
DA34
DA44
DA23
DA33
DA43
HOLES FOR
F
LANGE SCREWS
1/29 CONDUIT
CONNECTION
6-1/649 DIA.
1/49 NPT
1-1/29
1/49
NPT
1
-1 /8 9
[«\«1
DA21
DA31
DA41
DA22
DA32
DA42
3
REAR FLANGE MOUNTING HOLES (3)
2-13/169
1/49 NPT
[
\««1
79 DIA.
ADJUSTMENTS
1
/29
CONDUIT
HUB
G
ASKETED COVER
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.
5S (500 to 5000 psi (34.47 to 344.75 bar)) or Range No. 16S (800 to 8000 psi
1
55.16 to 551.6 bar)), be sure the special sealing nut (with PTFE insert) is turned
(
o the uppermost threaded section of the 1/2″ pressure connection. Apply a flat
t
pen-end wrench to the flat side of the bottom pressure connection when piping the
o
control. After properly connecting the control, tighten the sealing nut to assure a
leak-proof connection.
WATERTIGHT AND WEATHERPROOF
NEMA 2, 3, 4, 5, TYPES DAW, DRW, DSW
hese switches are supplied with flanged case, bottom connection, for surface
T
ounting only.
m
Weather-Proof Types DAW, DSW, DRW
EXPLOSION-PROOF TYPES DAH, DRH, DSH
ount with mounting lugs attached to control housing.
M
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.
General Purpose Types DA, DS, DR, DL
Flange for Surface Mounting
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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