Series DA/DS Bourdon Tube Pressure Switches

Bourdon Tube Pressure Switches
Pressure Ranges to 8000 psi (551.6 bar)

Pressure Ranges to 8000 psi (551.6 bar)

Customers tell us that the SERIES DA/DS are the best pressure switches made. The Mercoid D Series is one of the world’s broadest lines of pressure switches. The D Series has extremely high sensitivity and great repeatability. The DA Models are equipped with two external adjustments, one for setting high pressure operating point, the other for setting low pressure operating point. Deadband, the difference between high and low setpoints, is adjustable over the full-scale. The DS Models are equipped with a single external adjustment for setting operating point only. For mercury-free switches, choose between the snap action switch or hermetically sealed snap action switch. Hermetically sealed mercury switch also available.

Product Applications

  • Compressors
  • Mechanical HVAC or process equipment
  • Pump control
More Information
Model Chart
EXAMPLE_ _DA_ __ _31_153_ __4Standard DA Bourdon Tube Control, dual setpoint, automatic reset, SPDT mercury switch, 1-35 psig
 
RESET
OPTIONS
        R          U Manual reset, single adjustment, operates on decrease automatically
G
E
N
E
R
A
L
        R          L Manual reset, single adjustment, operates on increase automatically
        S(3)   Automatic reset, single adjustment, DS only
        L(1)(3)   Manual lock reset, single adjustment, available as special order only
HOUSING &
APPROVAL
OPTIONS
          W   Weatherproof enclosure, NEMA 3S, 4 and 4X, flanged back standard
N3     W   Weather resistance, includes drain, flanged back standard, available as special order only
          H   Explosion-proof enclosure, control integral, available only on DA, DR, DS
          E   Explosion-proof enclosure, control removable, available on DA, DR, DS
             F   Factory Mutual approval, DAW is FM approved as standard
CIRCUIT
SWITCHING
OPTIONS
  ___2 SPST opens on pressure increase, elect. code A, mercury switch
  ___3 SPST closes on pressure increase, elect. code A, mercury switch
  _153 SPDT, elect. code B, mercury switch
  _156 2 each SPST, one opens as the other one closes, elect. code A, mercury switch
  _804 2 each SPDT, elect. code B, mercury switch, 18" leads, elect. code G, snap switch, screw terminals
  _(___) Other circuits available, consult factory
 _2___2_ SPST opens on increase, elect. code I, DS only, mercury switch
 _2___3_ SPST closes on increase, elect. code I, DS only, mercury switch
 _4(2)(8)4122_ Two stage, includes 2 each SPST, mercury switch
 _4(2)(8)4129_ Two stage, includes 2 each SPST, mercury switch
 _4(2)(8)4132_ Two stage, includes 2 each SPST, mercury switch
 _4(2)(8)4123_ Two stage, includes 2 each SPST, mercury switch
 _5___2 SPST mercury switch, elect. code H, opens on increase
 _5___3 SPST mercury switch, elect. code H, closes on increase
 70  153 Snap switch, SPDT, elect. code D, 15A @ 120 VAC
 70(12)  804 2 each SPDT, elect. code F, for ranges above 35 psi only, add 30% to minimum deadbands, 702, 703, 704 only
 72  153_ DS only, snap switch, SPDT, elect. code E
 72  804_ 2 each SPDT, snap switches, elect. code G, DS only
 74_____ Two stage, includes 2 each, SPDT snap switches, elect. code G
             B Delrin Bushed Movement, for all controls
RANGES &
BOURDON
TUBE
MATERIALS
     2 25Srange 30" Hg vac - 60 psig, type 403SS Bourdon tube
 
     2 26Srange 30" Hg vac - 75 psig, type 403SS Bourdon tube
 
     2 5Srange 2-60 psig, type 403SS Bourdon tube
 
     2 6Srange 5-100 psig, type 403SS Bourdon tube
 
     2 8Srange 10-200 psig, type 403SS Bourdon tube
 
     2 9Srange 10-300 psig, type 403SS Bourdon tube
 
     2 9ASrange 40-350 psig, type 403SS Bourdon tube
 
     2 10Srange 25-600 psig, type 403SS Bourdon tube
 
     2 11Srange 50-1000 psig, type 403SS Bourdon tube
 
     2 12Srange 100-1500 psig, type 403SS Bourdon tube
 
     2 13Srange 300-2500 psig, type 403SS Bourdon tube
 
     2 15Srange 500-5000 psig, type 403SS Bourdon tube, not avail. with housing E or back conn.
 
     2 16Srange 800-8000 psig, type 403SS Bourdon tube, not avail. with housing E or back conn.
 
     3 2range 0-30" Hg vac, brass Bourdon tube
 
     3 3range 10" Hg vac - 12 psig, brass Bourdon tube
 
     3 1range 1/8-15 psig, brass Bourdon tube
 
     3 3Arange 1/8-20 psig, brass Bourdon tube
 
     3 4range 1-35 psig, brass Bourdon tube
 
     3 27range 25" Hg vac - 50 psig, brass Bourdon tube
 
     3 5range 2-60 psig, brass Bourdon tube
 
     3 6range 5-100 psig, brass Bourdon tube
 
     3 7range 5-150 psig, brass Bourdon tube
 
     3 8range 10-200 psig, brass Bourdon tube
 
     3 9range 10-300 psig, brass Bourdon tube
 
     4 26Erange 30" Hg vac - 75 psig, 316SS Bourdon tube
 
     4 23Erange 5-75 psig, 316SS Bourdon tube
 
     4 6Erange 10-100 psig, 316SS Bourdon tube
 
     4 24Erange 10-150 psig, 316SS Bourdon tube
 
     4 9Erange 10-300 psig, 316SS Bourdon tube
 
     4 21Erange 30-400 psig, 316SS Bourdon tube
 
     4 22Erange 75-800 psig, 316SS Bourdon tube
 
     4 11Erange 100-1000 psig, 316SS Bourdon tube
 
     4 13Erange 200-2500 psig, 316SS Bourdon tube
 
     8(6) 23Krange 5-75 psig, 316SS Bourdon tube, carbon steel bottom, F housing standard
 
     8(6) 24Krange 10-150 psig, 316SS Bourdon tube, carbon steel bottom, F housing standard
 
     8(6) 9Krange 10-300 psig, 316SS Bourdon tube, carbon steel bottom, F housing standard
 
CONNECTION &
MOUNTING
OPTIONS
       1  Standard housing
 
       2  Back connection, not available on D-900 series, not available on ranges 15S, 16S
 
       3  Flanged back - standard on "W" models
 
       4  Back connection and flanged back, not available for ranges 15S, 16S, or on D-900, 9200, 9500 series
 
RANGES     35(4)(5) 1N-60 to 30°F, 150°F max., 304 SS bulb and copper capillary std.; SS special order
T
E
M
P
E
R
A
T
U
R
E
 
 
 
 
 
 
 
 
 
 
     35(4)(5) 3Nrange 0 to 100°F, 240°F max., 304 SS bulb and copper capillary std.; SS special order
     35(4)(5) 4Nrange 50 to 150°F, 250°F max., 304 SS bulb and copper capillary std.; SS special order
     35(4)(5) 5Nrange 100 to 200°F, 300°F max., 304 SS bulb and copper capillary std.; SS special order
     35(4)(5) 7Nrange 140 to 300°F, 500°F max., 304 SS bulb and copper capillary std.; SS special order
     35(4)(5) 8Nrange 250 to 415°F, 550°F max., 304 SS bulb and capillary std.
     35(4)(5) 9Nrange 350 to 550°F, 600°F max., 304 SS bulb and capillary std.
     35(4)(5) 10Nrange 100 to 300°F, 500°F max., 304 SS bulb and copper capillary std.; SS special order
     35(4)(5) 11Nrange 100 to 500°F, 600°F max., 304 SS bulb and capillary std.
     36(4)(5)(10) 5NSrange 100 to 200°F, 300°F max., 304 SS bulb std.
     36(4)(5)(10) 6NSrange 140 to 250°F, 380°F max., 304 SS bulb std.
CONNECTION &
MOUNTING OPTIONS
     37(4)(5)(11)  Same as 36 except back connection, 304 SS bulb std.
     38(4)(5)  Same as 36 except has flanged back
     39(4)(5)(9)  Same as 35 except has flanged back and back connection

NOTES:
(1) Not available on D_ _-_5, 74 or 95.
(2) Available on DA only.
(3) Not available on D_ _ _-70_ _.
(4) & (5) Not available with 9, 92, 95 Diaph. Seals.
(6) Available also as _ _ 28, 58, 708 and 728. Not available with E or H housing or 70-804 circuit.
(7) F available only as DAF, DSF, DRF, DAHF, DRHF, DSHF, not all ranges or circuits.
(8) Switch rating for D-400: AC, 120V @ .3A, 240V @ .15A, 24V @ .8A, DC, 120V @ .15A, 240A @ .07A. Not available for 440V service.
(9) Available only as _ _39, 539, 239, 7039, 7239, 439 and 7439.
(10) Available only as _ _36, 7036 and 7236.
(11) Available only as _ _37, 7037 and 7237.
(12) Available only on 702, 703 and 704.

ELECTRICAL RATING CODES

For Mercury Switch Contacts
CODE
CIRCUIT
SUFFIX NO.
AC CAPACITY
DC RESISTIVE
HORSEPOWER
120V
240V
440V
120V
240V
AC
DC
A
-2, -3
10A
5A
3A
10A
5A
3/4
1/3
B
-153, -804
4A
2A
(1)
4A
2A
1/8
NA
C
-2, -3
(6)
(6)
(6)
10A
5A
3/4
1/3
H
-2, -3
5A
2A
NA
2-1/2A
1A
1/8
1/10
I(2)
-2, -3
0.3A
0.15A
NA
0.15A
0.07A
NA
NA
For Snap-Action Contacts
CODE
CIRCUIT
SUFFIX NO.
AC CAPACITY
DC RESISTIVE
HORSEPOWER
120V
240V
440V
120V
240V
AC
DC
D
-153
15A
15A
15A@480V
1/2A
1/4A
1/8
NA
E
-153
15A
15A
NA
(4)
(4)
(3)
NA
F
-804
12A
10A
5A
1/2A
1/4A
(3)
NA
G
-804
5A
5A
NA
(5)
(5)
NA
NA
 
 
 
 
 
 
 
 
 

 

NOTES: 
(1) -153 circuit available 1A 440V AC on special order.
(2) Also rated 0.9A at 24V AC.
(3) 1/4 HP at 120V AC, 1/2 HP at 240V AC.
(4) DC rated controls (up to 10A.
(5) 5A, 30V DC resistive.
(6) 17A non-inductive at 120/240/440V AC.

Options
  • Explosion-proof Enclosure (Series DAH): Suitable for Class I, Groups C and D; NEMA 7; Class II, Groups E, F, G; Class III NEMA 9 and 9A, Division 1. Add "H" to model number after DA or DS. Example: DAH-31-153-7.
  • FM Approved: For general purpose and explosion-proof models see Agency Approvals on Specification page. Add "F" to model number after DA, DS, DAH or DSH. Examples: DAF-31-153-7 or DAHF-31-153-7.
  • Other Options (consult factory): DPDT switches or other switch types, fixed deadband mercury switch units for low deadband applications, manual reset operation, two-stage operation, acetal bushed movement for applications with high amounts of vibration and/or pulsation, fungus proofing, siphon, diaphragm seals, mounting flange and remote connection.
  • Weatherproof Enclosure (Series DAW): Add "W" to model number after DA or DS and change 1 to 3. Example: DAW-33-153-7.
Wetted Materials: Brass, 403 SS, or 316 SS.
Temperature Limit: 180°F (82°C).
Pressure Limit: Maximum pressure of the operating range.
Enclosure Rating: General purpose, weatherproof or explosion-proof.
Repeatability: ±1% of full operating range, ±1.5% on DS-7300 models.
Switch Type: SPST mercury switch, SPDT mercury switch, SPDT snap switch, or SPDT hermetically sealed snap switch. Other circuit types available.
Electrical Rating: See Catalog page.
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 range 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 (2.7 kg). Explosion-proof: 8 lb (3.5 kg).
Deadband: See Catalog page.
Agency Approvals: CE, CSA, FM, UL. (mercury switch units are not CE approved). (Consult factory for FM approval models.)
  • Visible calibrated dial provides an easy and fast check without having to open device causing dangerous conditions to operators
  • On/off indication (except hermetically sealed snap switch models) gives operator clear indication of state of switched equipment that could be located in another location
  • Adjustable or fixed deadband supports control applications by reducing equipment wear-out by unnecessary recycling
  • External switch setpoint adjustments reduces set-up time
  • Pressure ranges of full vacuum to 8000 psig gives application designers the ability to specify standard equipment, simplifying install and training, and reducing servicing costs
  • UL listed, CSA approved many models FM approved to support rigorous process applications and regulations
  • General purpose, weatherproof or explosion-proof enclosures for a variety of indoor or outdoor environments meeting the needs of multiple applications and uses