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The Fischer DS21 Differential Pressure Measuring and Switching Device is a high‑performance instrument engineered to monitor differential pressure across filters, ducts, or process lines, and to trigger switching actions when defined pressure thresholds are reached. Designed for industrial filtration, HVAC, and process automation applications, the DS21 ensures accurate pressure detection, system protection, and automated control — helping maintain system efficiency, safety, and reliability under continuous operation.
Key Features:
Precise differential pressure measurement for filters, ducts, or process lines to monitor flow or clogging conditions
Built-in switch activation for automatic alert, shutdown, or control when pressure crosses preset thresholds
Robust construction suitable for industrial environments and continuous operation under varying pressure and temperature loads
Easy integration into process control systems, HVAC, fluid filtration setups, and industrial automation panels
Enhances safety, system performance, and maintenance scheduling by providing real-time pressure monitoring and fault detection
Specifications:
Product Type: Differential Pressure Measuring & Switching Device
Model / Part Number: DS21
Brand: Fischer
Function: Measure differential pressure; provide switching output when pressure thresholds are exceeded or met
Application: Industrial filtration, HVAC systems, fluid/gas process lines, automation and control systems requiring pressure monitoring
Construction: Industrial‑grade pressure measurement and switch module designed for durability, precision, and long-term reliability
The Fischer DS21 Differential Pressure Measuring and Switching Device is a dependable solution for professionals needing accurate pressure control and automated switching in complex industrial systems. With its precise measurement, reliable switching capability, and rugged build, it helps ensure safe, efficient, and continuous operation — an excellent choice for filtration systems, process control installations, and industrial HVAC.
Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
