Features: Our piston sensor models are for liquid applications where durability and long life are required. Their simple design has fewer parts to wear out and also keeps the price low. A magnet attached to the dial pointer shaft follows a spring-loaded sensor magnet that moves as differential pressure changes. In this way the DP displacement of the sensor is translated to our easy-to-read 2.5 to 6-inch diameter dials.

• Heavy duty — to 10,000 psi line pressure
• Weatherproof design and rugged construction
• Gauge, switch and transmitter versions
• Popular in filtration and flow measurements

Features: Our 1002 series piston models are the lowest cost option for liquid applications. Though small, they are the favorites for OEM requirements and measure from 0-1 to 0-100 psid. Our 1020 series diaphragm models are more sensitive and measure from 0-25” H2O to 0-30 psid

1002PI/PIS Series
Differential Pressure Range: 0-1 to 0-100 psid (0-0.07 to 0-7 bar)
Max line pressure: 3000* psig (200 bar)/200ºF (93ºC)
Accuracy: 5%
Porting: 1/8” NPT
Electrical available: 1 switch

Features: Our Class 1, Div. 2 enclosures found throughout this catalog are popular for hazardous environments where explosive gases or vapors may be present. Our Class 1, Div. 1 Explosion-proof line, expands on that protection. The heavy-duty enclosures are designed to seal the electronics from environments where flammable gases or vapors often exist and to contain any potential explosions.

The switches and electrical connections are housed in special UL, CSA, FM and ATEX approved enclosures. The cast aluminum housings have two mounting lugs, two 3/4” NPT electrical conduit ports, and meet the following specifications: Class 1, Gr. B, C, & D; Class 2, Gr. E, F, & G; and Class 3. They also meet NEMA 3, 4X, 7, 9, & 12 specifications.

Features: The popular 1516 model measures from 0-1 psid up to 0-50 psid. Our 1800 series models include our most sensitive diaphragm which can measure from 0-5”H2O to 0-8 psid.We also offer compound range models with a zero center. The diaphragm sensor separates the high and low pressure ports making them popular for gases as well as liquids. There is no bypass between these ports as with our piston models.

1516DG/DGS/DS Series
Differential Pressure Range: 0-1 to 0-50 psid
Max line pressure: 1500 psig (100 bar)/200ºF (93ºC)
Accuracy: 2%
Porting: 1/4″ NPT
Electrical available: 1 or 2 switches, Class 1 Div 2

Features: Our 1502 and 1533 models have a heavy-duty diaphragm that is designed for high differential pressures, to 300 psid. This extends the range of our diaphragm sensor DP line – much higher than the more sensitive 1516 model. Though heavy-duty, the diaphragms are still flexible and repeatable enough to match the ±2% accuracy of our other DP gauges.

1502DG/DGS Series
Differential Pressure Range: 0-10* to 0-300 psid
Max line pressure: 3000* psig (200 bar)/200ºF (93ºC)
Accuracy: 2%
Porting: 1/4″ NPT
Electrical available: 1 switch

Features: SERIES 2000 Magnehelic® Gage for high accuracy–guaranteed within 2% of full scale–and for the wide choice of 81 models available to suit your needs precisely. Using Dwyer’s simple, frictionless Magnehelic® gage movement, it quickly indicates low air or non-corrosive gas pressures–either positive, negative (vacuum) or differential. The design resists shock, vibration and over-pressures.

Accuracy: ±2% of FS (±3% on -0, -100PA, -125PA, -10MM and ±4% on -00, -60PA, -6MM ranges), throughout range at 70°F (21.1°C).
Pressure Limits: -20 in Hg to 15 psig† (-0.677 to 1.034 bar); MP option: 35 psig (2.41 bar); HP option: 80 psig (5.52 bar).
Overpressure: Relief plug opens at approximately 25 psig (1.72 bar), standard gages only.

Features: Our piston sensor models are for liquid applications where durability and long life are required. Their simple design has fewer parts to wear out and also keeps the price low. A magnet attached to the dial pointer shaft follows a spring-loaded sensor magnet that moves as differential pressure changes. In this way the DP displacement of the sensor is translated to our easy-to-read 2.5 to 6-inch diameter dials.

• Heavy duty — to 10,000 psi line pressure
• Weatherproof design and rugged construction
• Gauge, switch and transmitter versions
• Popular in filtration and flow measurements

Features: Our Class 1, Div. 2 enclosures found throughout this catalog are popular for hazardous environments where explosive gases or vapors may be present. Our Class 1, Div. 1 Explosion-proof line, expands on that protection. The heavy-duty enclosures are designed to seal the electronics from environments where flammable gases or vapors often exist and to contain any potential explosions.

The switches and electrical connections are housed in special UL, CSA, FM and ATEX approved enclosures. The cast aluminum housings have two mounting lugs, two 3/4” NPT electrical conduit ports, and meet the following specifications: Class 1, Gr. B, C, & D; Class 2, Gr. E, F, & G; and Class 3. They also meet NEMA 3, 4X, 7, 9, & 12 specifications.

Features: The popular 1516 model measures from 0-1 psid up to 0-50 psid. Our 1800 series models include our most sensitive diaphragm which can measure from 0-5”H2O to 0-8 psid.We also offer compound range models with a zero center. The diaphragm sensor separates the high and low pressure ports making them popular for gases as well as liquids. There is no bypass between these ports as with our piston models.

1516DG/DGS/DS Series
Differential Pressure Range: 0-1 to 0-50 psid
Max line pressure: 1500 psig (100 bar)/200ºF (93ºC)
Accuracy: 2%
Porting: 1/4″ NPT
Electrical available: 1 or 2 switches, Class 1 Div 2

Features: Our 1502 and 1533 models have a heavy-duty diaphragm that is designed for high differential pressures, to 300 psid. This extends the range of our diaphragm sensor DP line – much higher than the more sensitive 1516 model. Though heavy-duty, the diaphragms are still flexible and repeatable enough to match the ±2% accuracy of our other DP gauges.

1502DG/DGS Series
Differential Pressure Range: 0-10* to 0-300 psid
Max line pressure: 3000* psig (200 bar)/200ºF (93ºC)
Accuracy: 2%
Porting: 1/4″ NPT
Electrical available: 1 switch

Features: Barksdale’s Housed Diaphragm Differential Pressure Switches offer superior accuracy in a robust package, making them an ideal solution to your industrial pressure control needs. These switches are ideal applications requiring water-tight, NEMA 4 housings, a covered terminal strip and tamper-proof external adjustment. (Unit can be factory set upon request.) With pressure ranges up to 150 psi, these housed diaphragm differential pressure switches are suitable for use in either positive pressure or vacuum applications. Available in single-circuit and dual-circuit models. These switches feature a durable, die-cast aluminum enclosure. For applications requiring a highly accurate switch in a durable package, Barksdale’s Housed Diaphragm Differential Pressure Switches are the ideal choice.

Electrical Characteristics: All models incorporate Underwriters Laboratories, Inc. and CSA Listed single
pole double throw snap-action switching elements
Accuracy: ± 5% of the adjustable range
Switch: SPDT snap action 4 amps @ 125/250 VAC (Class AA limit switch); 5 amps @ 125/250 VAC (Class BB limit switch).
Wetted Parts:
Polysulfone, 40% glass filled
Dacron reinforced neoprene
Polysulfone, 40% glass filled
Electrical Connection:
12” free leads or
3-contact terminal block

Features: SERIES A3000 Photohelic® Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic® gage design. The Photohelic® switch/gage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5 bar) psig. Two phototransistor actuated, DPDT relays are included for low/high limit control.

SERIES A3000 Photohelic® Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic® gage design. The Photohelic® switch/gage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5 bar) psig. Two phototransistor actuated, DPDT relays are included for low/high limit control.

Features: Barksdale’s CDPD1H and CDPD2H Housed Diaphragm Differential Pressure Switches are the answer for pressure control applications requiring tamper proof external adjustment and environments which require water-tight NEMA 4 housings. These pressure switches are available in single or dual control settings for both positive pressure and vacuum models, to 150 psi. The switches may be wired normally open or normally closed through a 3/4″-14 NPT conduit connection to free leads. All models feature calibrated dials for adjusting setpoints in units can be factory set upon request. For applications requiring a highly reliable, accurate switch in a durable package, Barksdale’s CDPD1H and CDPD2H Housed Diaphragm Differential Pressure Switches are the ideal choice

Electrical Characteristics: All models incorporate Underwriters’ Laboratories, Inc. listed single pole
double throw snap-action switching elements. Switches may be wired “normally open” or “normally closed”.
Accuracy: ± 0.5% of the adjustable range
Switch: SPDT single or dual circuit 10 amps @ 125/250 VAC; 3 amps @ 480 VAC (Class A or H limit switch)
Wetted Parts: 17-7 PH stainless steel Viton®
Die-cast aluminum anodized
Nickel painted aluminum
300 series stainless steel
Electrical Connection: Free leads approximately 18” long No. 16
AWG standard AWN 105/c wire through 3/4” conduit connection.
Enclosure Ratings: Housed watertight housing (NEMA 4) Tamper-proof external adjustment.

Features: Barksdale’s Housed Diaphragm Differential Pressure Switches offer superior accuracy in a robust package, making them an ideal solution to your industrial pressure control needs. These switches are ideal applications requiring water-tight, NEMA 4 housings, a covered terminal strip and tamper-proof external adjustment. (Unit can be factory set upon request.) With pressure ranges up to 150 psi, these housed diaphragm differential pressure switches are suitable for use in either positive pressure or vacuum applications. Available in single-circuit and dual-circuit models. These switches feature a durable, die-cast aluminum enclosure. For applications requiring a highly accurate switch in a durable package, Barksdale’s Housed Diaphragm Differential Pressure Switches are the ideal choice.

Accuracy: ± 0.5% of the adjustable range
Switch: SPDT snap action; single or dual circuit 10 amps @ 125/250 VAC; 3 amps @ 480
VAC (Class A or H limit switch). Consult product configurator for ratings of optional limit switches.
Wetted Parts: 17-7 PH stainless steel Viton®
Die-cast aluminum anodized
Nickel plated aluminum
300 series stainless steel
Electrical Connection: Screw terminals on covered terminal strip through 1/2” NPT conduit fitting
Enclosure Ratings: NEMA 4
Pressure Connection: 1/8” NPT female high + low

Features: Our piston sensor models are for liquid applications where durability and long life are required. Their simple design has fewer parts to wear out and also keeps the price low. A magnet attached to the dial pointer shaft follows a spring-loaded sensor magnet that moves as differential pressure changes. In this way the DP displacement of the sensor is translated to our easy-to-read 2.5 to 6-inch diameter dials.

• Heavy duty — to 10,000 psi line pressure
• Weatherproof design and rugged construction
• Gauge, switch and transmitter versions
• Popular in filtration and flow measurements

Features: Our Class 1, Div. 2 enclosures found throughout this catalog are popular for hazardous environments where explosive gases or vapors may be present. Our Class 1, Div. 1 Explosion-proof line, expands on that protection. The heavy-duty enclosures are designed to seal the electronics from environments where flammable gases or vapors often exist and to contain any potential explosions.

The switches and electrical connections are housed in special UL, CSA, FM and ATEX approved enclosures. The cast aluminum housings have two mounting lugs, two 3/4” NPT electrical conduit ports, and meet the following specifications: Class 1, Gr. B, C, & D; Class 2, Gr. E, F, & G; and Class 3. They also meet NEMA 3, 4X, 7, 9, & 12 specifications.

Features: The popular 1516 model measures from 0-1 psid up to 0-50 psid. Our 1800 series models include our most sensitive diaphragm which can measure from 0-5”H2O to 0-8 psid.We also offer compound range models with a zero center. The diaphragm sensor separates the high and low pressure ports making them popular for gases as well as liquids. There is no bypass between these ports as with our piston models.

1516DG/DGS/DS Series
Differential Pressure Range: 0-1 to 0-50 psid
Max line pressure: 1500 psig (100 bar)/200ºF (93ºC)
Accuracy: 2%
Porting: 1/4″ NPT
Electrical available: 1 or 2 switches, Class 1 Div 2

Features: Our 1502 and 1533 models have a heavy-duty diaphragm that is designed for high differential pressures, to 300 psid. This extends the range of our diaphragm sensor DP line – much higher than the more sensitive 1516 model. Though heavy-duty, the diaphragms are still flexible and repeatable enough to match the ±2% accuracy of our other DP gauges.

1502DG/DGS Series
Differential Pressure Range: 0-10* to 0-300 psid
Max line pressure: 3000* psig (200 bar)/200ºF (93ºC)
Accuracy: 2%
Porting: 1/4″ NPT
Electrical available: 1 switch

Features: SERIES 605 Magnehelic® Indicating Transmitter provides for both visual monitoring and electronic control of very low differential pressure. The Series 605 is ideal for control applications in building HVAC systems where local indication is desired during routine maintenance checks or necessary when trouble shooting the system. The easily read dial gage is complimented by the two-wire, 4-20 mA control signal utilizing the time-proven Dwyer® Magnehelic® gage mechanical design and Series 600 transmitter technology. The two-wire design with terminal strip on the rear simplifies connection in any 4-20 mA control loop powered by a 10-35 VDC supply.

Accuracy: See chart (includes linearity, hysteresis, repeatability).
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
Compensated Temperature Range: 32 to 120°F (0 to 48.9°C).
Thermal Effect: ±0.025% FS/°F (0.045% FS/°C).
Power Requirements: 10 to 35 VDC (2-wire).
Output Signal: 4 to 20 mA.
Zero and Span Adjustments: Protected potentiometers.
Loop Resistance: DC: 0 to 1250 Ω max.
Current Consumption: DC: 38 mA max.
Electrical Connections: Screw terminal block.

Features: The Series DT190 differential pressure sensors are constructed of all welded stainless steel and are more robust than fluid filled differential pressure transducers with bolted construction. The DT190 is free of any fluid fill and thus has expanded temperature ranges. The smaller size and all welded construction make these units ideal for applications exhibiting higher levels of shock and vibration.

• All Welded Stainless Steel
• Compact Size
• Wide Temperature Capabilities
• No Fluid Fill
• Ranges From 50 to 40,000 psid
• Unidirectional and Bidirectional Operation
• 0.25% Accuracy
• 19 Point Calibration Record Traceable to NIST