Series DA/DS Bourdon Tube Pressure Switches

Pressure Ranges to 8000 psi (551.6 bar)

Customers tell us that the SERIES DA/DS are the best pressure switches made. The Mercoid DA/DS Series is one of the world’s broadest lines of pressure switches. The DA/DS 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.

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Product Applications

  • Compressors
  • Mechanical HVAC or process equipment
  • Pump control

Models & Ordering

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Model Description Usually Ships Price Order
DA-21-153-10S
Ships: Next Day
Price: $578.00
Pressure switch, 403SS Bourdon tube, range 25-600 psig, 25 psig min. deadband. Next Day $578.00 Order
DA-21-153-11S
Ships: Next Day
Price: $725.00
Pressure switch, 403SS Bourdon tube, range 50-1000 psig, 60 psig min. deadband. Next Day $725.00 Order
DA-21-153-12S
Ships: 1-2 Weeks
Price: $778.00
Pressure switch, 403SS Bourdon tube, range 100-1500 psig, 90 psig min. deadband. 1-2 Weeks $778.00 Order
DA-21-153-13S
Ships: Next Day
Price: $778.00
Pressure switch, 403SS Bourdon tube, range 300-2500 psig, 150 psig min. deadband. Next Day $778.00 Order
DA-21-153-15S
Ships: 1-2 Weeks
Price: $786.00
Pressure switch, 403SS Bourdon tube, range 500-5000 psig, 450 psig min. deadband. 1-2 Weeks $786.00 Order
DA-21-153-16S
Ships: 1-2 Weeks
Price: $786.00
Pressure switch, 403SS Bourdon tube, range 800-8000 psig, 750 psig min. deadband. 1-2 Weeks $786.00 Order
DA-21-153-25S
Ships: 1-2 Weeks
Price: $514.00
Pressure switch, 403SS Bourdon tube, range 30" Hg Vac-60 psig, 6 psig min. deadband. 1-2 Weeks $514.00 Order
DA-21-153-26S
Ships: 1-2 Weeks
Price: $514.00
Pressure switch, 403SS Bourdon tube, range 30" Hg Vac-75 psig, 8 psig min. deadband. 1-2 Weeks $514.00 Order
DA-21-153-5S
Ships: Next Day
Price: $514.00
Pressure switch, 403SS Bourdon tube, range 2-60 psig, 4 psig min. deadband. Next Day $514.00 Order
DA-21-153-6S
Ships: Next Day
Price: $514.00
Pressure switch, 403SS Bourdon tube, range 5-100 psig, 6 psig min. deadband. Next Day $514.00 Order
DA-21-153-8S
Ships: Next Day
Price: $514.00
Pressure switch, 403SS Bourdon tube, range 10-200 psig, 8 psig min. deadband. Next Day $514.00 Order
DA-21-153-9AS
Ships: Next Day
Price: $578.00
Pressure switch, 403SS Bourdon tube, range 40-350 psig, 14 psig min. deadband. Next Day $578.00 Order
DA-21-153-9S
Ships: Next Day
Price: $549.00
Pressure switch, 403SS Bourdon tube, range 10-300 psig, 14 psig min. deadband. Next Day $549.00 Order
DA-31-153-1
Ships: Next Day
Price: $384.00
Pressure switch, brass Bourdon tube, range 1/8-15 psig, 1 psig min. deadband. Next Day $384.00 Order
DA-31-153-2
Ships: Next Day
Price: $384.00
Pressure switch, brass Bourdon tube, range 30-0" Hg Vac, 2" Hg min. deadband. Next Day $384.00 Order
DA-31-153-27
Ships: 1-2 Weeks
Price: $384.00
Pressure switch, brass Bourdon tube, range 25" Hg Vac-50 psig, 3.5 psig min. deadband. 1-2 Weeks $384.00 Order
DA-31-153-3
Ships: Next Day
Price: $384.00
Pressure switch, brass Bourdon tube, range 10" Hg Vac-12 psig, 1 psig min. deadband. Next Day $384.00 Order
DA-31-153-3A
Ships: Next Day
Price: $384.00
Pressure switch, brass Bourdon tube, range 1/8-20 psig, 1 psig min. deadband. Next Day $384.00 Order
DA-31-153-4
Ships: Next Day
Price: $384.00
Pressure switch, brass Bourdon tube, range 1-35 psig, 1.75 psig min. deadband. Next Day $384.00 Order
DA-31-153-5
Ships: Next Day
Price: $384.00
Pressure switch, brass Bourdon tube, range 2-60 psig, 3 psig min. deadband. Next Day $384.00 Order
DA-31-153-6
Ships: Next Day
Price: $384.00
Pressure switch, brass Bourdon tube, range 5-100 psig, 3.75 psig min. deadband. Next Day $384.00 Order
DA-31-153-7
Ships: Next Day
Price: $384.00
Pressure switch, brass Bourdon tube, range 5-150 psig, 6 psig min. deadband. Next Day $384.00 Order
DA-31-153-8
Ships: Next Day
Price: $424.00
Pressure switch, brass Bourdon tube, range 10-200 psig, 8 psig min. deadband. Next Day $424.00 Order
DA-31-153-9
Ships: Next Day
Price: $424.00
Pressure switch, brass Bourdon tube, range 10-300 psig, 12 psig min. deadband. Next Day $424.00 Order
DA-41-153-11E
Ships: 1-2 Weeks
Price: $778.00
Pressure switch, 316SS Bourdon tube, range 100-1000 psig, 100 psig min. deadband. 1-2 Weeks $778.00 Order
DA-41-153-13E
Ships: 1-2 Weeks
Price: $778.00
Pressure switch, 316SS Bourdon tube, range 200-2500 psig, 210 psig min. deadband. 1-2 Weeks $778.00 Order
DA-41-153-21E
Ships: 1-2 Weeks
Price: $598.00
Pressure switch, 316SS Bourdon tube, range 30-400 psig, 30 psig min. deadband. 1-2 Weeks $598.00 Order
DA-41-153-22E
Ships: 1-2 Weeks
Price: $679.00
Pressure switch, 316SS Bourdon tube, range 75-800 psig, 75 psig min. deadband. 1-2 Weeks $679.00 Order
DA-41-153-23E
Ships: 1-2 Weeks
Price: $549.00
Pressure switch, 316SS Bourdon tube, range 5-75 psig, 3 psig min. deadband. 1-2 Weeks $549.00 Order
DA-41-153-24E
Ships: Next Day
Price: $549.00
Pressure switch, 316SS Bourdon tube, range 10-150 psig, 6 psig min. deadband. Next Day $549.00 Order
DA-41-153-26E
Ships: 1-2 Weeks
Price: $549.00
Pressure switch, 316SS Bourdon tube, range 30" Hg Vac-75 psig, 7 psig min. deadband. 1-2 Weeks $549.00 Order
DA-41-153-6E
Ships: 1-2 Weeks
Price: $549.00
Pressure switch, 316SS Bourdon tube, range 10-100 psig, 7 psig min. deadband. 1-2 Weeks $549.00 Order
DA-41-153-9E
Ships: Next Day
Price: $570.00
Pressure switch, 316SS Bourdon tube, range 10-300 psig, 18 psig min. deadband. Next Day $570.00 Order

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Specifications

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.)

Features

  • 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

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.

Accessories

Model Number Description Usually Ships Price Order
Mounting bracket. 33-25 Mounting bracket. 1-2 Weeks $33.25 Order
Pigtail siphon, 250 psig max. 42-52 Pigtail siphon, 250 psig max. 1-2 Weeks $61.50 Order
Remote connection, 6 ft. copper, 2500 psig max. 49-62HP Remote connection, 6 ft. copper, 2500 psig max. 1-2 Weeks $85.00 Order
Remote connection, 12 ft. 316SS, 3000 psig max. 49-210 Remote connection, 12 ft. 316SS, 3000 psig max. 1-2 Weeks $210.00 Order

Videos

Model Chart

EXAMPLE _ _DA_ _ _ _31 _153_ _ _4 Standard 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   25S range 30" Hg vac - 60 psig, type 403SS Bourdon tube
 
      2   26S range 30" Hg vac - 75 psig, type 403SS Bourdon tube
 
      2   5S range 2-60 psig, type 403SS Bourdon tube
 
      2   6S range 5-100 psig, type 403SS Bourdon tube
 
      2   8S range 10-200 psig, type 403SS Bourdon tube
 
      2   9S range 10-300 psig, type 403SS Bourdon tube
 
      2   9AS range 40-350 psig, type 403SS Bourdon tube
 
      2   10S range 25-600 psig, type 403SS Bourdon tube
 
      2   11S range 50-1000 psig, type 403SS Bourdon tube
 
      2   12S range 100-1500 psig, type 403SS Bourdon tube
 
      2   13S range 300-2500 psig, type 403SS Bourdon tube
 
      2   15S range 500-5000 psig, type 403SS Bourdon tube, not avail. with housing E or back conn.
 
      2   16S range 800-8000 psig, type 403SS Bourdon tube, not avail. with housing E or back conn.
 
      3   2 range 0-30" Hg vac, brass Bourdon tube
 
      3   3 range 10" Hg vac - 12 psig, brass Bourdon tube
 
      3   1 range 1/8-15 psig, brass Bourdon tube
 
      3   3A range 1/8-20 psig, brass Bourdon tube
 
      3   4 range 1-35 psig, brass Bourdon tube
 
      3   27 range 25" Hg vac - 50 psig, brass Bourdon tube
 
      3   5 range 2-60 psig, brass Bourdon tube
 
      3   6 range 5-100 psig, brass Bourdon tube
 
      3   7 range 5-150 psig, brass Bourdon tube
 
      3   8 range 10-200 psig, brass Bourdon tube
 
      3   9 range 10-300 psig, brass Bourdon tube
 
      4   26E range 30" Hg vac - 75 psig, 316SS Bourdon tube
 
      4   23E range 5-75 psig, 316SS Bourdon tube
 
      4   6E range 10-100 psig, 316SS Bourdon tube
 
      4   24E range 10-150 psig, 316SS Bourdon tube
 
      4   9E range 10-300 psig, 316SS Bourdon tube
 
      4   21E range 30-400 psig, 316SS Bourdon tube
 
      4   22E range 75-800 psig, 316SS Bourdon tube
 
      4   11E range 100-1000 psig, 316SS Bourdon tube
 
      4   13E range 200-2500 psig, 316SS Bourdon tube
 
      8(6)   23K range 5-75 psig, 316SS Bourdon tube, carbon steel bottom, F housing standard
 
      8(6)   24K range 10-150 psig, 316SS Bourdon tube, carbon steel bottom, F housing standard
 
      8(6)   9K range 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)   3N range 0 to 100°F, 240°F max., 304 SS bulb and copper capillary std.; SS special order
      35(4)(5)   4N range 50 to 150°F, 250°F max., 304 SS bulb and copper capillary std.; SS special order
      35(4)(5)   5N range 100 to 200°F, 300°F max., 304 SS bulb and copper capillary std.; SS special order
      35(4)(5)   7N range 140 to 300°F, 500°F max., 304 SS bulb and copper capillary std.; SS special order
      35(4)(5)   8N range 250 to 415°F, 550°F max., 304 SS bulb and capillary std.
      35(4)(5)   9N range 350 to 550°F, 600°F max., 304 SS bulb and capillary std.
      35(4)(5)   10N range 100 to 300°F, 500°F max., 304 SS bulb and copper capillary std.; SS special order
      35(4)(5)   11N range 100 to 500°F, 600°F max., 304 SS bulb and capillary std.
      36(4)(5)(10)   5NS range 100 to 200°F, 300°F max., 304 SS bulb std.
      36(4)(5)(10)   6NS range 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.

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