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Model 120 Piston Type Differential Pressure Gauge & Switch
Brand: Mid-West InstrumentPiston type gauges are primarily designed for liquid applications.
Differential Pressure is sensed by the movement of a precisely ground floating piston/magnet in a precision bore against a calibrated spring.
Any variation in pressure on either side of the piston/magnet will cause the magnet to move proportionally to the change in differential pressure.
A rotary pointer magnet located close to the internal magnet, but outside the pressure housing, follows the movement of the piston magnet and indicates differential pressure on the dial.
Piston type DP gauges exhibit a slight amount of bypass as the fluid crosses from the high to the low pressure port.
Due to precision sizing of piston and body bore, leakage across the piston will not exceed 15 SCFH air at 100 psiD at ambient conditions.
Features- Simple, rugged, compact design
- Working pressures up to 6,000 psiG (400 bar)
- Over-range protection to maximum pressure
- Body Materials: Aluminum or 316L Stainless Steel with 316 stainless steel internals. Aluminum Bronze & Monel available
- Weather-resistant construction standard
- Shatter resistant acrylic lens
- Variety of Dial type and Sizes: 2-1/2", 3-1/2", 4-1/2" & 6"
- Available DP Ranges: Inches H2O, psiD, bar, and kPa
- ¼" Female NPT & ½" Female NPT process connections
- Multiple mounting options available
- Temperature limits: -40° to +200° F (-40° to 93° C)
1 - 12 of 20 Part Numbers
EW-68404-40
Mid-West Instrument 120-AA-00-O(AA)-5P Piston Type Differential Pressure Switch, 5 psi, Al, Grommet.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 5
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-41
Mid-West Instrument 120-AA-00-O(AA)-10P Piston Type Differential Pressure Switch, 10 psi, Al, Gromme.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 10
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-42
Mid-West Instrument 120-AA-00-O(AA)-15P Piston Type Differential Pressure Switch, 15 psi, Al, Gromme.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 15
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-44
Mid-West Instrument 120-AA-00-O(AA)-25P Piston Type Differential Pressure Switch, 25 psi, Al, Gromme.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 25
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-48
Mid-West Instrument 120-AA-00-O(AA)-100P Piston Type Differential Pressure Switch, 100 psi, Al, Grom.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 100
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-50
Mid-West Instrument 120-AA-00-O(AA)-5P Piston Type Differential Pressure Switch, 5 psi, Al, 1/4" NPT.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 5
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-51
Mid-West Instrument 120-AA-00-O(CA)-10P Piston Type Differential Pressure Switch, 10 psi, Al, 1/4" N.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 10
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-54
Mid-West Instrument 120-AA-00-O(CA)-25P Piston Type Differential Pressure Switch, 25 psi, Al, 1/4" N.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 25
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-55
Mid-West Instrument 120-AA-00-O(CA)-30P Piston Type Differential Pressure Switch, 30 psi, Al, 1/4" N.
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 30
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-59
Mid-West Instrument 120-AA-00-O(CA)-110P Piston Type Differential Pressure Switch, 110 psi, Al, 1/4".
- Accuracy - ±2% full-scale (ascending)
- Case - Aluminum
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 110
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-66
Mid-West Instrument 120-SA-00-O(AA)50P Piston Type Differential Pressure Switch, 50 psi, SS, Grommet.
- Accuracy - ±2% full-scale (ascending)
- Case - Stainless Steel
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 50
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
EW-68404-68
Mid-West Instrument 120-SA-00-O(AA)100P Piston Type Differential Pressure Switch, 100 psi, SS, Gromm.
- Accuracy - ±2% full-scale (ascending)
- Case - Stainless Steel
- Dial Size (in) - 2.5
- Dial Size (mm) - 64
- Display - Analog dial
- Electrical Connections - 0.88" (22 mm) conduit
- Enclosure Rating - NEMA 4X, IP65
- Lens Material - Acrylic
- Max Pressure (PSID) - 100
- Max Temperature (° C) - 93
- Max Temperature (° F) - 200
- Media Compatibility - Gases and liquids compatible with wetted materials
- Min Pressure (PSID) - 0
- Min Temperature (° C) - -40
- Min Temperature (° F) - -40
- Output - SPDT
- Process Connection - 1/4" NPT(F), back
- Switch output - 0.25 A at 125 VAC/VDC (3 W)
- Unit Of Measurement - psid
- Wetted Materials - 316 SS, Buna N, PTFE
1 - 12 of 20 Part Numbers
Specifications
Brand
Accuracy
- ± 2 %
Approvals & Certifications
- CE
- CRN
- CSA (C,US)
- RoHS
- UL (C,US)
Diaphragm Material
- Ethylene Propylene (EPR)
- Neoprene
- Perfluoroelastomer
- Teflon
- Viton
Enclosure, Body Material
- 316 Stainless Steel
- 316L Stainless Steel
- Aluminum
- Aluminum Bronze
- Monel
Environmental Protection
- IP65
- IP66
- NEMA 4X
- NEMA 7
NACE & NIST
- NACE
NPT Connection
- 1/4” NPT Female
Output
- 4-20 mA
Pressure Type
- Differential
Set Point - Decreasing
- bar: 0 to 7
- kPa: 0 to 700
- psi: 0 to 110
Set Point - Increasing
- bar: 0 to 7
- kPa: 0 to 700
- psi: 0 to 110
Switch Type
- SPDT 3 W, 125 Vac/dc, 0.25 A, 60 W, 240 Vac/dc, 1 A
- SPST 60 W, 240 Vac/dc, 3 A
System Pressure
- bar: 0 to 400
- kPa: 0 to 40,000
- psig: 0 to 6,000