ESC switches mount through a tank wall and use a hinged cylindrical float to actuate an internal magnetic reed switch. The compact structure suits water-treatment equipment, heating systems, small reservoirs and industrial liquid-control equipment. The contact provides a level signal to the receiving control system.
The float and body are stainless steel, with 304 or 316 material options. The assembly also uses engineering plastic and sealing rubber. Lead-wire versions have high-temperature silicone insulation with double-fiber braiding; ESC19 uses a Hirschmann-style connector.
| Parameter | 1A1 | 2A1 |
|---|---|---|
| Maximum contact rating | 10VA | 20VA |
| Maximum switching voltage | 100VAC/DC | 220VAC/DC |
| Maximum switching current, resistive load | 0.5A | 1.5A |
| Breakdown-voltage reference | 110VAC/DC | 300VAC/DC |
| Maximum contact resistance | 100mΩ | |
| Operating temperature | −30–120°C | |
| Applicable liquid-density reference | 700kg/m³ | |
Observe the contact-power, voltage and current limits simultaneously. Use a suitably rated receiving relay or controller for the switch signal and a relay or contactor matched to a heater, valve or pump load. Select the liquid and sealing compatibility for the complete assembly.
All dimensions are in mm. The float length is 55.5mm and the fixed sensing tube diameter is 8mm for all six models. Overall length is measured in the folded position shown in the dimensional drawings.
| Model | Mounting thread | Overall length | Float diameter | Electrical connection |
|---|---|---|---|---|
| ESC11 | M10×1 | 114 | 16.9 | Braided silicone leads |
| ESC12 | G1/2; 14TPI | 116 | 17 | |
| ESC13 | M12 | |||
| ESC14 | M14 | |||
| ESC15 | M16 | |||
| ESC19 | G1/2; 14TPI | 151 | Hirschmann-style connector; cable diameter 5.5mm |
The following values identify the remaining dimensions in each model's drawing. Keep each set with its matching illustration. Thread pitch for M12, M14 and M16 must match the selected tank fitting.
| Model | Mounting or body callouts, mm | Float-arm callouts, mm |
|---|---|---|
| ESC11 | 15.5; 4.9; fixed tube length 34.5 | Arm 30; float length 55.5 |
| ESC12 | 5.8; 16.6; fixed tube length 34.5 | Arm 30; float length 55.5 |
| ESC13 | 14.5; fixed tube length 43.1 | Hinged assembly 86; float length 55.5 |
| ESC14 | ||
| ESC15 | ||
| ESC19 | Connector 36×35.5; collar 6; thread length 16.5; fixed tube length 34 | Arm 30; float length 55.5 |
Manual VC-ESC-200407 identifies these earlier DC contact options. Specify the required contact configuration when selecting a replacement or a new assembly.
| Parameter | 1A1, 0.2A configuration | 2A1, 0.2A configuration |
|---|---|---|
| Maximum contact power | 10VA | 30VA |
| Switching voltage | 110VDC | 220VDC |
| Switching current | 0.2A, resistive load | |
| Breakdown voltage | 200VDC | 300VDC |
| Temperature range | −30–125°C | |
| Float material | 304 stainless steel | |
Provide clearance for the complete hinged movement and keep deposits or obstructions away from the float. Check the actual open/closed contact states at high and low liquid levels before connecting the controller. In heating applications, the level signal can operate a low-water interlock through the receiving control system.
Select the thread, stainless steel grade, sealing materials and wiring for the liquid, temperature and tank conditions. Avoid impact and strong external magnetic fields. Test operation after installation, inspect the float movement regularly and disconnect power before maintenance.
