The Sentinel Float Valve System takes the hassle out of maintaining water levels and handling chemical injection. It’s designed to save you time, cut down on maintenance costs, and help you maximize your profits. Whether you need a fill rate as low as 1 GPM or as high as 64 GPM, this system has you covered. When paired with DEMA proportions and injectors, it makes mixing chemicals safe, simple, and dependable. With the Sentinel, water and chemical management has become easier and more efficient than ever.
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Features & Benefits
Models
Accessories
Resources
- Multiple fill rates are available
- Chemical injection models available
- Integrated Backflow Prevention available on some models
|
Model |
Flow Rate | Induction | Back Flow | On/Off | |
| Chemical Injection System | (GPM at 40 psi) | MIN | MAX | Protection | Valve |
|
540.22T |
4.0 | 430:1 | 4:1 | No |
Yes |
|
540.23T |
4.0 | 430:1 | 4:1 | Action Gap |
Yes |
|
540.23BT |
4.0 | 387:1 | 7:1 | Action Gap |
Yes |
|
540.23BT.ACID |
4.0 | 387:1 | 7:1 | Action Gap |
Yes |
|
540.24 |
2.5 | 195:1 | 2:1 | Action Gap |
Yes |
|
537P.21 |
22.0 | 1828:1 | 14:1 | Siphon Breaker |
No |
| Chemical Injection System | |||||
|
540N |
6.0 | N/A | N/A | N/A |
Yes |
| 537PN | 64.0 | N/A | N/A | N/A |
No |
* Shown above are the most common configurations. Many additional configurations are readily available, contact us at [email protected] or speak with your DEMA sales representative for more information.
Water Supply Hoses
Chemical Storage Racks
Metering Tip Kit
Ultra Lean Metering Tip Kit

Water Supply Hoses
-
- DEMA manufacturers a variety of water inlet hoses for different applications. DEMA inlet hoses are rated to 200psi, made of durable double-walled rubber, and crimped to our manufacturing facility specifications. Refer to the DEMA water supply hose guide included in the Resources section of this product page for more information.

Chemical Storage Racks
-
- DEMA offers various chemical rack configurations to store chemical containers. Racks are available to mount DAH Extreme directly to the rack or mounted separately. The racks are metal wire and feature a powder-coated finish for durability and chemical resistance. Refer to the DEMA rack guide included in the Resources section of this product page for more information.

Metering Tip Kit
-
- For applications that require standard dilutions, DEMA offers a Metering Tip Kit for purchase, separate from your dispenser. The tip kit is DEMA # 100-15K and comes with 14 metering tips. Compatible with all DEMA action gap or air gap 1/4” metering elbow configuration.

Ultra Lean Metering Tip Kit
-
- For applications that require very lean dilutions, DEMA offers an Ultra Lean Metering Tip Kit for purchase, separate from your dispenser. The tip kit is DEMA# 100.15KU and comes with four additional metering tips. Compatible with all DEMA action gap or air gap 1/4” metering elbow configuration.




