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_ _	_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
CODE	CIRCUIT SUFFIX NO.	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
CODE	CIRCUIT SUFFIX NO.	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.

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

Download Brochures

Series DA/DS Bourdon Tube Pressure Switches

Quality Service Reliability