
1638-2 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $59.99 | Top Pick! Condition is New – Open box, DWYER SERIES 1630 DIFFERENTIAL PRESSURE SWITCH 1638-2, shipping cost = $8.75 | 99.7% |
![]() | $69.99 | Condition is New – Open box, NEW Dwyer 1638-2 Diaphragm Vertical Pressure Switch Type 1 Enclosure 10PSI 480V, FREE SHIPPING | ![]() |
![]() | $74.99 | Condition is New – Open box, Dwyer Instruments Differential Pressure Switch 1638-2, FREE SHIPPING | 99.8% |
![]() | $90.00 | Condition is New – Open box, DWYER 1638-2 480VAC 15A 10PSI NSNP, FREE SHIPPING | 99.9% |
![]() | $75.00 | Top Pick! Condition is New – Open box, Dwyer 1638-2 Pressure Switch 1/4HP 260VAC, shipping cost = $40.70 | 100.0% |
![]() | $118.94 | Top Pick! Condition is New – Open box, DWYER 1638-2 480VAC 15A 10PSI NSMP, FREE SHIPPING | 99.9% |
![]() | $139.00 | Condition is New – Open box, DWYER 1638-2 480VAC 15A 10PSI NSMP, FREE SHIPPING | 99.9% |
![]() | $149.95 | Condition is New – Open box, DWYER 1638-2 NSFB, shipping cost = $10.00 | 99.6% |
![]() | $134.99 | Condition is New – Open box, NOS DWYER 1630 SERIES DIFFERENTIAL PRESSURE SWITCH 1638-2, shipping cost = $27.35 | 100.0% |
![]() | $151.00 | Top Pick! Condition is New – Open box, DWYER 1638-2 DIFFERENTIAL PRESSURE SWITCH, shipping cost = $10.13 | 95.5% |
![]() | $149.99 | Condition is New – Open box, DWYER PRESSURE SWITCH 1638-2 NEW IN BOX, shipping cost = $26.01 | 99.9% |
![]() | $219.95 | Condition is New – Open box, DWYER 1638-2 NSNBC01, shipping cost = $10.00 | 99.6% |
![]() | $642.00 | Condition is New – Open box, DWYER 1638-2 480VAC 15A 25PSI (AS PICTURED) NSNP, FREE SHIPPING | 99.9% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $118.11 | Condition is New, DWYER Pressure Switch 1638-2 Max Pressure 10 Psi, FREE SHIPPING | 99.8% |
![]() | $120.00 | Condition is New, NEW Dwyer 1638-2 Pressure Switch STOCK SGF145, FREE SHIPPING | 99.7% |
![]() | $89.00 | Condition is New, DWYER INST. 1638-2 DIAPHRAGM VERTICAL PRESSURE SWITCH, shipping cost = $40.00 | 99.7% |
![]() | $149.00 | Condition is New, DWYER PRESSURE SWITCH 1638-2, shipping cost = $50.00 | 99.7% |
![]() | $668.35 | Condition is New, Dwyer Instruments 1638-2 Dwyer Series 1630 Large Diaphragm Differential Pressure, FREE SHIPPING | 98.6% |
![]() | $807.35 | Condition is New, DWYER 1638-2 / 16382 (BRAND NEW), shipping cost = $12.90 | 99.7% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $34.98 | Condition is Used, NEW DWYER 1638-2 ADJUSTABLE DIFFERENTIAL PRESS. SWITCH / RANGE: 1.0 to 3.0" W.C., FREE SHIPPING | 99.9% |
![]() | $42.98 | Condition is Used, DWYER 1638-2 PRESSURE SWITCH 16382 / USED, FREE SHIPPING | 99.9% |
![]() | $30.00 | Condition is Used, Dwyer Cat. No. 1638-2 Diaphragm Vertical-Type 1 Encl. Max Press. 10 PSI A5708WVS, shipping cost = $21.40 | 100.0% |
![]() | $52.20 | Top Pick! Condition is Used, USED DWYER PRESSURE DIFFERENTIAL SWITCH 1638-2, FREE SHIPPING | 99.6% |
![]() | $33.50 | Condition is Used, Dwyer 1638-2 Differential Pressure Switch Range 1-3", shipping cost = $21.40 | 100.0% |
![]() | $35.00 | Condition is Used, Dwyer Instruments 1638-2 Pressure Switch 10 PSI, shipping cost = $22.05 | 100.0% |
![]() | $35.00 | Top Pick! Condition is Used, Dwyer Instruments 1638-2 Differential Pressure Switch 10 PSI, shipping cost = $25.44 | 100.0% |
![]() | $37.50 | Condition is Used, Dwyer Instruments - P/N: 1638-2 - Differential Pressure Null Switch, shipping cost = $23.36 | 99.6% |
![]() | $26.99 | Condition is Used, DWYER DIFFERENTIAL PRESSURE SWITCH 1-3" CAT NO 1638-2, shipping cost = $37.00 | 99.5% |
![]() | $19.91 | Condition is Used, Dwyer 1638-2 Pressure Switch 10/25 PSI 1-3IWC 125/480V 15A USED, shipping cost = $97.94 | 99.7% |
![]() | $63.87 | Condition is Used, Dwyer pressure differential switch CAT no. 1638-2 max 10 psi surge 25 psi, shipping cost = $137.43 | 100.0% |
![]() | $484.41 | Condition is Used, DWYER 1638-2 / 16382 (USED), shipping cost = $12.90 | 99.7% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $79.84 | Condition is New: Never Used, Dwyer pressure differential switch CAT no. 1638-2 max 10 psi surge 25 psi, shipping cost = $137.43 | 100.0% |

The Dwyer Model 1638-2 Pressure Switch is a versatile and reliable solution for a wide range of pressure monitoring applications. This switch is designed to provide superior performance in industrial environments, making it an excellent choice for HVAC systems, water treatment facilities, and other industrial processes.
The Dwyer 1638-2 operates on AC voltage of 125/250/480 volts and is capable of detecting pressure changes within a range of 10 to 25 psi (0.7 to 1.7 bar). The switch is constructed with heavy-duty materials, including a cast aluminum body and stainless steel diaphragm, ensuring long-lasting durability and resistance to harsh conditions.
The 1638-2 features a compact design, making it easy to install and integrate into various systems. The switch comes with a clear, easy-to-read pressure gauge and is equipped with a built-in test port, allowing for quick and easy calibration checks. The switch also includes a piloted reset mechanism, ensuring safe and reliable operation.
The Dwyer Model 1638-2 Pressure Switch is designed to provide accurate and consistent pressure readings, even under varying temperature and pressure conditions. The switch is also UL listed, ensuring compliance with industry safety standards.
The switch comes with a number of mounting options, including wall, panel, and pipe mounting, making it adaptable to a wide range of installation configurations. The switch also includes a flexible diaphragm, allowing for easy adjustment to various system configurations.
In summary, the Dwyer Model 1638-2 Pressure Switch is a high-performance, reliable, and versatile pressure monitoring solution, suitable for a wide range of industrial applications. Its heavy-duty construction, accurate pressure sensing capabilities, and easy installation make it an excellent choice for those seeking a durable and dependable pressure switch.
The Dwyer Model 1638-2 pressure switch is a versatile option for various industrial applications due to its ability to handle different voltage inputs (125/250/480V-AC) and pressure ranges (10-25psi). Here are some pros and cons of buying this pressure switch:
Pros:1. Versatility: The Dwyer Model 1638-2 pressure switch is suitable for a wide range of applications due to its ability to operate on different voltage inputs and pressure ranges.
2. Durable Construction: This pressure switch is built to withstand harsh industrial environments with its rugged, NEMA 4X rated enclosure.
3. Easily Adjustable: The adjustable set point feature allows for easy calibration of the pressure switch, ensuring accurate pressure readings.
4. Reliable Performance: The Dwyer Model 1638-2 pressure switch is known for its reliable performance and long service life.
Cons:1. Complex Installation: Due to its versatility and adjustable features, the installation process for this pressure switch can be more complex than some other models.
2. Higher Cost: The Dwyer Model 1638-2 pressure switch is more expensive than some other models due to its advanced features and capabilities.
Conclusion:The Dwyer Model 1638-2 pressure switch is an excellent option for industrial applications that require a versatile, durable, and reliable pressure switching solution. Its adjustable set point feature and rugged construction make it a valuable investment for businesses that need precise pressure control and a long service life. However, the complex installation process and higher cost may be a deterrent for some buyers. Ultimately, the decision to purchase the Dwyer Model 1638-2 pressure switch should be based on the specific requirements of your application and budget.
Recommendation:If you require a versatile, durable, and reliable pressure switching solution for your industrial application, the Dwyer Model 1638-2 pressure switch is an excellent choice. Despite its complex installation process and higher cost, the advanced features and capabilities of this pressure switch make it a worthwhile investment for businesses that need precise pressure control and a long service life. However, if your application does not require the advanced features of this pressure switch, there may be less expensive options that better suit your needs. It is recommended to carefully consider the specific requirements of your application and budget before making a purchase decision.
Details:
specifications indusswitch:
- brand: Dwyer
- mpn: 1638-2
- part type: Pressure Switch
- voltage: Ac
- reference sku: 1689038
- product condition: New Other
seller indusswitch:
- rating: 99.9%
- city: delta, ohio
- # reviews: 113707
shipping indusswitch:
- class: standard, expedited, one-day
- type: fixed
- transit: 2-4 days
- service: standard, expedited, overnight
returns indusswitch:
- paid by: seller
- policy: returns accepted
- time: 30 days
- method: money back
general indusswitch:
- category: Business & Industrial > Electrical Equipment Supplies > Pressure Switches
payments indusswitch:
- wallet: google-pay
- credit card: discover
- other
offer indusswitch:
- in stock #: 5
- prices: $19.91–$807.35
- item condition:
- New – Open box
- New
- Used
- New: Never Used
- best offers: true
- sold #: 17
- availability: in stock
- started: may 19, 2025
- options: ship-to-home
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