The Shridhan HFS Series comprises Horizontal Mounting Magnetic Float Level Switches for high, low or intermediate point level switching.
Designed for tanks with inaccessible tops or bottoms and applications where the insertion depth of top-mounted models is exceeded.
Available with multiple enclosure, wetted-part, process connection, switch and pressure-temperature configurations, including external chamber installation.
✅ Genuine Shridhan product with manufacturer warranty
✅ ProSens Automation — Coimbatore, Erode & Salem
The Shridhan HFS Series comprises Horizontal Mounting Magnetic Float Level Switches designed for high, low or intermediate point level switching in industrial tanks and vessels.
The HFS Series is particularly suited to tanks with inaccessible tops or bottoms and applications where the insertion depth of conventional top-mounted level switches is exceeded.
The switch uses a free-moving pivoted float assembly and magnetic repulsion to operate the switching mechanism. Dual magnets are used — one in the float arm and another in the contact carrier inside the switch enclosure. A change in liquid level causes magnetic repulsion and produces a changeover of the contacts with snap action.
The magnetic transmission is glandless, which the brochure describes as eliminating a leakage path from the vessel into the switch housing. HFS switches are available in different materials, enclosures and configurations for a broad range of media and applications.
The HFS Series operates using magnetic repulsion rather than a conventional direct mechanical transmission.
| Component | Function |
|---|---|
| Pivoted float assembly | Moves with changes in liquid level. |
| Float magnet | Provides the magnetic field associated with float movement. |
| Contact-carrier magnet | Works with the float magnet through magnetic repulsion. |
| Switch mechanism | Changes contact state with snap action as liquid level changes. |
The switch enclosure is made from non-magnetic material to maintain the magnetic flux required for operation.
| Installation | Application |
|---|---|
| Internal mounting | Direct installation inside the tank or vessel. |
| External chamber mounting | Used when the switch needs to be installed outside the main vessel. |
| Side mounting | Normal mounting arrangement for the HFS Series. |
| Top installation | The brochure notes top installation as preferred for applications such as slurry. |
External mounting can be used where space is limited or mechanical devices such as stirrers operate inside the tank. The brochure also describes external mounting for boilers and reaction kettles where isolation can assist regular servicing.
| Parameter | Available Options |
|---|---|
| Enclosure | Weather Proof IP65 / Aluminum; Flame Proof / SS304 for Group IIA, IIB; Flame Proof / SS304 for Group IIC; Polypropylene; Others |
| Wetted Parts | SS304, SS316, SS316L, Polypropylene, Titanium, Hastelloy C276, PVDF, Others |
| Process Connection | Multiple flange configurations, 1.5" NPT(M), 2" NPT(M), Others |
| Switch Type | 1 SPDT, 2 SPDT, hermetically sealed 1 SPDT, hermetically sealed 1 DPDT |
| Float | Multiple material and diameter combinations |
| Accessories | Counter flange, counter flange with test lever, counter flange stub, chamber and others |
| Option | Specification |
|---|---|
| Flange | Sq. 92 × 92 PCD, casted flange |
| Flange | Ø120 mm × 92 PCD |
| Flange | Ø127 mm × 98 PCD, 1½" #150 |
| Flange | Ø152 mm × 121 PCD, 2" #150 |
| Flange | Ø152 mm × 114 PCD, 2" BS 10-E |
| Flange | Ø190 mm × 152.4 PCD, 3" #150 |
| Flange | Ø165 mm × 127 PCD, 2½" BS 10-E |
| Flange | Ø178 mm × 140 PCD, 2½" #150 |
| Flange | Ø230 mm × 190 PCD, 4" #150 |
| Threaded | 1.5" NPT (M) |
| Threaded | 2" NPT (M) |
| Option | Rating / Description |
|---|---|
| 1 SPDT Micro Switch | 250V AC / 5A |
| 2 SPDT Micro Switch | 250V AC / 5A |
| Hermetically Sealed Micro Switch | 250V AC / 5A, 1 SPDT |
| Hermetically Sealed Micro Switch | 250V AC / 5A, 1 DPDT * |
* Consult factory.
| Configuration | Pressure / Temperature Rating |
|---|---|
| Ambient | Ambient pressure & temperature |
| Option 2 | 10 kg/cm², 150°C |
| Option 3 | 10 kg/cm², 180°C |
| Option 4 | 20 kg/cm², 180°C |
| Option 5 | 40 kg/cm², 200°C |
| Option 6 | 100 kg/cm², 150°C |
| Code | Material | Float Diameter |
|---|---|---|
| F1 | SS304 | 50 mm |
| F2 | SS304 | 57 mm |
| F3 | SS316 | 57 mm |
| F4 | PP | 60 mm |
| F5 | PP | 53 mm |
| F6 | SS316L | 46 mm |
| F7 | SS316L | 50 mm |
| F8 | SS316 | 50 mm |
| Accessory | Availability |
|---|---|
| No accessory | Not applicable |
| Counter flange | Available |
| Counter flange with test lever | Available |
| Counter flange stub | Available |
| Chamber | Available |
| Application / Situation | HFS Use |
|---|---|
| Tanks with inaccessible tops | Horizontal mounting provides an alternative to top-mounted installation. |
| Tanks with inaccessible bottoms | Suitable for horizontal point-level switching. |
| Limited insertion depth | Suitable where top-mounted insertion depth is exceeded. |
| Boilers | External mounting option is described for boiler applications. |
| Reaction kettles | External mounting can allow isolation for servicing. |
| Slurry applications | The brochure notes top installation as preferred for slurry. |
The HFS switch can be wired to make or break electrical circuits associated with burners, heaters, motor pumps, alarms and other electrically operated devices.
The brochure provides the ordering structure HFS 1 2 3 4 5 6 7. The selection is based on enclosure, wetted parts, process connection, switch type, pressure-temperature rating, float and accessories.
| Selection | What to Specify |
|---|---|
| 1 — Enclosure | Weather-proof / flame-proof / polypropylene / other |
| 2 — Wetted Parts | SS304 / SS316 / SS316L / PP / Titanium / Hastelloy C276 / PVDF / other |
| 3 — Process Connection | Required flange or threaded connection |
| 4 — Switch Type | Required micro-switch configuration |
| 5 — Pressure & Temperature | Required pressure-temperature rating |
| 6 — Float | Float material and diameter |
| 7 — Accessories | Counter flange, test lever, stub, chamber or other accessory |
The brochure provides HFS W 2 1 1 2 F3 as an example ordering configuration. Actual selection should be made according to the customer's tank, liquid, process connection, switching and pressure-temperature requirements.
ProSens Automation supplies Shridhan Automation level switches for industrial liquid-level applications across Coimbatore, Erode, Salem and locations across India.
For correct HFS selection, share the tank arrangement, liquid details, mounting position, required switching point, process connection, pressure, temperature and electrical switching requirements.
Need a quotation? Contact ProSens Automation for price, availability, technical specifications and application compatibility.
What is the Shridhan HFS Series?
The HFS Series is a Horizontal Mounting Magnetic Float Level Switch designed for high, low or intermediate point level switching.
When should I use an HFS instead of a top-mounted level switch?
The brochure specifically identifies HFS for tanks with inaccessible tops or bottoms and where the insertion depth of top-mounted models is exceeded.
How does the HFS switch operate?
It uses a pivoted float assembly and dual magnets. Changes in liquid level cause magnetic repulsion, producing snap-action switching.
Can HFS be installed outside the tank?
Yes. The brochure provides an external chamber option for installation outside the main vessel.
Is an explosion-proof version available?
Yes. The ordering information includes flame-proof SS304 enclosure options for Group IIA/IIB and Group IIC applications.
What process connections are available?
The brochure lists several flange configurations as well as 1.5" NPT(M) and 2" NPT(M), with other options available.
What pressure and temperature ratings are available?
The ordering information lists configurations from ambient pressure and temperature through ratings including 10 kg/cm² at 150°C, 20 kg/cm² at 180°C, 40 kg/cm² at 200°C and 100 kg/cm² at 150°C.
Can the HFS Series be customized?
Yes. The brochure explicitly lists customization on request.
