The Shridhan DLS Series comprises Displacer Type Magnetic Level Switches for liquid level alarm and control applications.
The DLS operates on the buoyancy principle, using suspended displacers and spring movement to actuate a magnetic switching mechanism as liquid level changes.
Designed for simple or complex applications including surging and agitated liquids, with configurations for large tanks, high temperature, high pressure and vacuum applications.
✅ Genuine Shridhan product with manufacturer warranty
✅ ProSens Automation — Coimbatore, Erode & Salem
The Shridhan DLS Series Displacer Type Magnetic Level Switch provides a wide choice of alarm and control configurations for industrial liquid level applications.
The DLS works on a simple buoyancy principle. As the liquid level rises and progressively immerses the displacer elements, the effective weight suspended on the spring reduces. The resulting change in spring length produces magnet movement and operates the switching mechanism.
The DLS is designed for applications involving surging liquids, agitated fluids and other demanding level-control conditions. The brochure also specifies configurations suitable for large tanks up to 15 metres and customized arrangements for high-temperature, high-pressure and vacuum applications.
Built-in limit stops help prevent over-stroking under level surge conditions. The switch points can be adjusted at site, depending on the selected configuration.
The DLS uses a displacer that is heavier than the liquid and is suspended by a spring. When the liquid level rises and contacts the displacer, buoyancy reduces the effective suspended weight.
This causes the spring to retract slightly to a new equilibrium position. The spring movement causes the magnetic sleeve to move into the field of the external magnet, actuating the switching element.
The switching mechanism operates in a similar manner to the switching mechanism used in vertical float-operated level switches. :contentReference[oaicite:0]{index=0}
| Component | Function |
|---|---|
| Displacer | Senses liquid level through buoyancy effect |
| Flexible Rope | Suspends the displacer |
| Return Spring | Changes effective spring length as liquid level changes |
| Magnetic Sleeve | Transfers spring movement to the magnetic switching mechanism |
| Switch Mechanism | Provides the electrical switching output |
| Limit Stops | Helps prevent over-stroking during level surges |
| Parameter | Specification |
|---|---|
| Enclosure | Cast Aluminium, Weather Proof IP66; Cast Aluminium Ex-proof Gr. IIA & IIB or IIC |
| Conduit Connection | Brass ¾" ET or ½" NPT |
| Measuring Range | 500 mm ~ 15000 mm |
| Operating Differential | 40 ± 5 mm / Adjustable / 65 ± 5 mm |
| Switch Type | Micro switch |
| Switch Contacts | 2 SPDT (2 NO + 2 NC) @ 5A, 230 VAC (Resistive) |
| Switch Action | Bistable |
| Terminals | To suit 1.5 mm² conduit |
| Flexible Rope | SS304, SS316, PP, PTFE |
| Displacer | SS304, SS316, PP, PTFE |
| Spring Housing | SS316, PP / PTFE Insulation |
| Spring Material | SS316, SS316L |
| Process Connection | MS, SS304, SS316, PP (SS clad), PTFE (SS clad) |
| Flanged Process Connection | MS, SS304, SS316, PP (65 NB) |
| Perforated Still Well | MS, SS304, SS316, PP (80 NB) |
| External Cage | MS, SS304, SS316, PP (80 NB) |
| Maximum Temperature | 0–200°C without cooling fins; 0–300°C with cooling fins |
| Temperature Above 300°C | Contact factory |
| Maximum Test Pressure | Vacuum to 40 kg/cm²; contact factory for pressure above 40 kg/cm² |
| Minimum Specific Gravity | 0.7; contact factory for specific gravity below 0.7 |
The above specifications are taken from the DLS general-specification table in the brochure. :contentReference[oaicite:1]{index=1}
The brochure describes both narrow-differential and wide-differential arrangements.
| Configuration | Description |
|---|---|
| Single Switch Models | Narrow differential type instruments intended for level alarm applications. |
| Dual Switch Models | Can provide different switching levels and wider differential control. |
| Wide Differential | Factory calibrated with a choice of operating sequences. |
| Multiple Displacers | Ordering options include One/One, Two/One, Two/Two, Three/Two and Three/Three switch/displacer arrangements. |
For narrow differential instruments, the brochure specifies a differential band of approximately ±51 mm (2") in water, varying with liquid specific gravity. For wide differential units, the minimum differential band is approximately 152 mm (6") in water, with the maximum differential determined by the displacer suspension cable length. :contentReference[oaicite:2]{index=2}
| Installation | Description |
|---|---|
| Internal Direct Mounting | Displacer assembly installed directly inside the tank. |
| Perforated Still Well | Available in MS, SS304, SS316 and PP configurations. |
| External Chamber | External chamber arrangement available with different material options. |
| Option | Configuration |
|---|---|
| 1 | 3" #150 ANSI Flange |
| 2 | 80 NB, BS 10-E Flange |
| O | Others |
| Material | Ordering Option |
|---|---|
| SS304 | 1 |
| SS316 | 2 |
| PP | 3 |
| Teflon | 4 |
| Others | O |
| Application / Media Condition | Suitability Mentioned in Brochure |
|---|---|
| Foaming liquids | Suitable for level control applications |
| Surging liquids | Suitable for level applications involving surging conditions |
| Agitated fluids | Suitable for agitated liquid applications |
| Sewage handling | Listed application |
| Dirty liquids | Listed application |
| Paints | Listed application |
| Liquids with solids | Listed application |
The brochure specifically identifies foaming or surging fluids, agitated fluids, sewage handling, dirty liquids, paints and liquids with solids as DLS applications. :contentReference[oaicite:3]{index=3}
The DLS Series can be configured for different pump-control and alarm sequences.
| Sequence | Operation Described in Brochure |
|---|---|
| Pump Control Plus Over-Flow Alarm | Pump stops at high level and starts when the liquid falls to the low level. If the pump does not stop and the liquid reaches the high-high level, an alarm or shutdown provision can be provided. |
| Drain / Dry-Run Protection Alarm | Pump stops at high level and starts when liquid falls to the low level. If the pump does not start and liquid reaches the low-low level, an alarm or additional pump-start command can be provided. |
These operating sequences are illustrated in the DLS brochure under the pump-control and alarm section. :contentReference[oaicite:4]{index=4}
The brochure specifies the DLS ordering structure as:
DLS 1 2 3 4 5 6 7
Example shown in the brochure:
DLS A A 2 G 1 1 N
| Code | Configuration |
|---|---|
| A | One / One |
| B | Two / One |
| C | Two / Two |
| D | Three / Two |
| E | Three / Three |
| Code | Configuration |
|---|---|
| A | Cast Aluminium, Weather Proof IP65 × ¾" ET |
| B | Cast Aluminium, Ex-proof IP66 Gr. IIA & IIB × ½" NPT |
| C | Cast Aluminium, Ex-proof IP66 Gr. IIC × ½" NPT |
| O | Others |
| Code | Material |
|---|---|
| 1 | SS304 |
| 2 | SS316 |
| 3 | PP |
| 4 | Teflon |
| O | Others |
The brochure lists the process connection material options as MS, SS304, SS316, PP and Teflon configurations, with other options available.
| Code | Configuration |
|---|---|
| 1 | 3" #150 ANSI Flange |
| 2 | 80 NB, BS 10-E Flange |
| O | Others |
| Code | Configuration |
|---|---|
| 1 | Internal Direct |
| 2 | Perforated Still Well in MS |
| 3 | Perforated Still Well in SS304 |
| 4 | Perforated Still Well in SS316 |
| 5 | Perforated Still Well in PP |
| 6 | External Chamber with 1" NB Flange in MS |
| 7 | External Chamber with 1" NB Flange in SS304 |
| 8 | External Chamber with 1" NB Flange in SS316 |
| 9 | External Chamber with 1" NB Flange in PP |
| O | Others |
| Code | Configuration |
|---|---|
| N | Not provided |
| P | Provided |
The complete DLS ordering information is taken from the brochure's DLS ordering section. :contentReference[oaicite:5]{index=5}
| Application | DLS Application Context |
|---|---|
| Large Tanks | Suitable for tanks up to 15 metres measuring range |
| Foaming Liquids | Level detection and control |
| Surging Liquids | Designed to handle level surge conditions |
| Agitated Fluids | Level control in agitated vessels |
| Sewage Handling | Liquid level monitoring and control |
| Dirty Liquids | Level control in dirty-liquid applications |
| Paints | Level detection and control |
| Liquids with Solids | Level detection and control |
Note: Actual supplied configuration depends on the selected DLS ordering code.
The Shridhan DLS Series is available through ProSens Automation for industrial liquid level alarm and control applications.
For selecting the correct DLS configuration, share the liquid type, specific gravity, tank height, required level points, operating temperature, pressure, process connection and installation arrangement.
ProSens Automation — Coimbatore, Erode & Salem
Shipping available across India.
The DLS Series is a Displacer Type Magnetic Level Switch designed for liquid level alarm and control applications.
It works using buoyancy. As liquid progressively immerses the displacer, its effective suspended weight changes, causing spring movement that actuates the magnetic switching mechanism.
The brochure specifies a measuring range of 500 mm to 15,000 mm and identifies suitability for large tanks up to 15 metres.
Yes. The brochure specifically states that DLS provides reliable performance in turbulent liquids even without still pipes.
The general specification lists a minimum specific gravity of 0.7. The brochure advises contacting the factory for specific gravity below 0.7.
The specified range is 0–200°C without cooling fins and 0–300°C with cooling fins. The brochure advises contacting the factory for temperatures above 300°C.
Yes. The general specification lists vacuum to 40 kg/cm² and advises contacting the factory for pressure above 40 kg/cm².
Yes. External chamber configurations are included in the DLS installation options and ordering information.
